In MVC, when do you use <%= %> and <% %>?
- by public static
Hi,
In asp.net mvc, when do we use:
<%= %
and
<% %
Do we ever need to put a ; (colon) ?
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WD MBWE II (White Strip Light) 2TB - unable to access data
- by user210477
I have a WD MBWE II (White Strip Light) 2TB - (WD20000H2NC-00) Was working fine until a few days ago. I guess there was a power failure and after that I am unable to access the 'Public' or the 'Download' folder anymore. I have been searching for answers everywhere but came up empty handed. Web GUI still works, SSH works. I hooked up both the drives on my PC and UFS Explorer sees the drive. But so far I am unable to retrieve any of my data. I do not remember what RAID setting I used when I first got the drive. I can see from GUI that it is set as "Stripe". The drive contains 10 years of family pictures which I really do not want to loose. Sadly and stupidly, I didn't even keep a backup of this drive. Can somebody please help or point me in the right direction. Thank you in advance for your help. Disk Utility on Ubuntu reports 1405 bad sectors on one drive. How can I retrieve my data? Please help. Logs below: ~ # mdadm --detail /dev/md[012345678] /dev/md0: Version : 0.90 Creation Time : Wed Jul 15 08:36:17 2009 Raid Level : raid1 Array Size : 1959872 (1914.26 MiB 2006.91 MB) Used Dev Size : 1959872 (1914.26 MiB 2006.91 MB) Raid Devices : 2 Total Devices : 2 Preferred Minor : 0 Persistence : Superblock is persistent Update Time : Fri Nov 1 13:53:29 2013 State : clean Active Devices : 2 Working Devices : 2 Failed Devices : 0 Spare Devices : 0 UUID : 04f7a661:98983b3b:26b29e4f:9b646adb Events : 0.266 Number Major Minor RaidDevice State 0 8 1 0 active sync /dev/sda1 1 8 17 1 active sync /dev/sdb1 /dev/md1: Version : 0.90 Creation Time : Wed Jul 15 08:36:18 2009 Raid Level : raid1 Array Size : 256896 (250.92 MiB 263.06 MB) Used Dev Size : 256896 (250.92 MiB 263.06 MB) Raid Devices : 2 Total Devices : 2 Preferred Minor : 1 Persistence : Superblock is persistent Update Time : Wed Oct 30 22:08:21 2013 State : clean Active Devices : 2 Working Devices : 2 Failed Devices : 0 Spare Devices : 0 UUID : aaa7b859:c475312d:efc5a766:6526b867 Events : 0.10 Number Major Minor RaidDevice State 0 8 2 0 active sync /dev/sda2 1 8 18 1 active sync /dev/sdb2 /dev/md2: Version : 0.90 Creation Time : Sat Sep 25 10:01:26 2010 Raid Level : raid0 Array Size : 1947045760 (1856.85 GiB 1993.77 GB) Raid Devices : 2 Total Devices : 2 Preferred Minor : 2 Persistence : Superblock is persistent Update Time : Fri Nov 1 13:30:53 2013 State : active Active Devices : 2 Working Devices : 2 Failed Devices : 0 Spare Devices : 0 Chunk Size : 64K UUID : 01dae60a:6831077b:77f74530:8680c183 Events : 0.97 Number Major Minor RaidDevice State 0 8 4 0 active sync /dev/sda4 1 8 20 1 active sync /dev/sdb4 /dev/md3: Version : 0.90 Creation Time : Wed Jul 15 08:36:18 2009 Raid Level : raid1 Array Size : 987904 (964.91 MiB 1011.61 MB) Used Dev Size : 987904 (964.91 MiB 1011.61 MB) Raid Devices : 2 Total Devices : 2 Preferred Minor : 3 Persistence : Superblock is persistent Update Time : Fri Nov 1 13:26:33 2013 State : clean Active Devices : 2 Working Devices : 2 Failed Devices : 0 Spare Devices : 0 UUID : 3f4099f2:72e6171b:5ba962fd:48464a62 Events : 0.54 Number Major Minor RaidDevice State 0 8 3 0 active sync /dev/sda3 1 8 19 1 active sync /dev/sdb3 mdadm: md device /dev/md4 does not appear to be active. mdadm: md device /dev/md5 does not appear to be active. mdadm: md device /dev/md6 does not appear to be active. mdadm: md device /dev/md7 does not appear to be active. mdadm: md device /dev/md8 does not appear to be active. ~ # cat /etc/mtab securityfs /sys/kernel/security securityfs rw 0 0 /dev/md2 /DataVolume xfs rw,usrquota 0 0 /dev/md4 /ExtendVolume xfs rw,usrquota 0 0 ~ # df -k Filesystem 1k-blocks Used Available Use% Mounted on /dev/md0 1929044 145092 1685960 8% / /dev/md3 972344 123452 799500 13% /var /dev/ram0 63412 20 63392 0% /mnt/ram ~ # mdadm -D /dev/md2 /dev/md2: Version : 0.90 Creation Time : Sat Sep 25 10:01:26 2010 Raid Level : raid0 Array Size : 1947045760 (1856.85 GiB 1993.77 GB) Raid Devices : 2 Total Devices : 2 Preferred Minor : 2 Persistence : Superblock is persistent Update Time : Fri Nov 1 13:30:53 2013 State : active Active Devices : 2 Working Devices : 2 Failed Devices : 0 Spare Devices : 0 Chunk Size : 64K UUID : 01dae60a:6831077b:77f74530:8680c183 Events : 0.97 Number Major Minor RaidDevice State 0 8 4 0 active sync /dev/sda4 1 8 20 1 active sync /dev/sdb4 ~ # mdadm -D /dev/md4 mdadm: md device /dev/md4 does not appear to be active. ~ # mount /dev/root on / type ext3 (rw,noatime,data=ordered) proc on /proc type proc (rw) sys on /sys type sysfs (rw) /dev/pts on /dev/pts type devpts (rw) securityfs on /sys/kernel/security type securityfs (rw) /dev/md3 on /var type ext3 (rw,noatime,data=ordered) /dev/ram0 on /mnt/ram type tmpfs (rw) ~ # cat /var/log/messages Oct 29 18:04:50 shmotashNAS daemon.warn wixEvent[3462]: Network Link - NIC 1 link is down. Oct 29 18:04:59 shmotashNAS daemon.info wixEvent[3462]: Network Link - NIC 1 link is up 100 Mbps full duplex. Oct 29 18:04:59 shmotashNAS daemon.info wixEvent[3462]: Network IP Address - NIC 1 use static IP address 192.168.1.102 Oct 29 18:17:45 shmotashNAS daemon.warn wixEvent[3462]: Network Link - NIC 1 link is down. Oct 29 18:17:53 shmotashNAS daemon.info wixEvent[3462]: Network Link - NIC 1 link is up 100 Mbps full duplex. Oct 29 18:17:53 shmotashNAS daemon.info wixEvent[3462]: Network IP Address - NIC 1 use static IP address 192.168.1.102 Oct 30 00:50:11 shmotashNAS daemon.warn wixEvent[3462]: Network Link - NIC 1 link is down. Oct 30 00:50:19 shmotashNAS daemon.info wixEvent[3462]: Network Link - NIC 1 link is up 100 Mbps full duplex. Oct 30 00:50:19 shmotashNAS daemon.info wixEvent[3462]: Network IP Address - NIC 1 use static IP address 192.168.1.102 Oct 30 16:29:47 shmotashNAS daemon.warn wixEvent[3462]: Network Link - NIC 1 link is down. Oct 30 16:30:00 shmotashNAS daemon.info wixEvent[3462]: Network Link - NIC 1 link is up 100 Mbps full duplex. Oct 30 16:30:00 shmotashNAS daemon.info wixEvent[3462]: Network IP Address - NIC 1 use static IP address 192.168.1.102 Oct 30 18:27:22 shmotashNAS daemon.warn wixEvent[3462]: Network Link - NIC 1 link is down. Oct 30 18:27:30 shmotashNAS daemon.info wixEvent[3462]: Network Link - NIC 1 link is up 100 Mbps full duplex. Oct 30 18:27:30 shmotashNAS daemon.info wixEvent[3462]: Network IP Address - NIC 1 use static IP address 192.168.1.102 Oct 30 19:06:03 shmotashNAS daemon.warn wixEvent[3462]: Network Link - NIC 1 link is down. Oct 30 19:06:10 shmotashNAS daemon.info wixEvent[3462]: Network Link - NIC 1 link is up 100 Mbps full duplex. Oct 30 19:06:10 shmotashNAS daemon.info wixEvent[3462]: Network IP Address - NIC 1 use static IP address 192.168.1.102 Oct 30 19:14:58 shmotashNAS daemon.warn wixEvent[3462]: Media Server - Media Server cannot find the path to one or more of the default folders: /Public/Shared Music, /Public/Shared Pictures or /Public/Shared Videos. Please verify that these folders have not been removed or that the names have not been changed. Oct 30 19:20:05 shmotashNAS daemon.alert wixEvent[3462]: Thermal Alarm - System temperature exceeded threshold.(66 degrees) Oct 30 19:58:29 shmotashNAS daemon.alert wixEvent[3462]: HDD SMART - HDD 1 SMART Health Status: Failed. Oct 30 22:05:39 shmotashNAS daemon.info init: Starting pid 13043, console /dev/null: '/usr/bin/killall' Oct 30 22:05:39 shmotashNAS syslog.info System log daemon exiting. Oct 30 22:08:09 shmotashNAS syslog.info syslogd started: BusyBox v1.1.1 Oct 30 22:08:09 shmotashNAS daemon.warn wixEvent[3557]: Network Link - NIC 1 link is down. Oct 30 22:08:19 shmotashNAS daemon.info wixEvent[3557]: Network Link - NIC 1 link is up 100 Mbps full duplex. Oct 30 22:08:25 shmotashNAS daemon.warn wixEvent[3557]: Network Link - NIC 1 link is down. Oct 30 22:08:37 shmotashNAS daemon.info wixEvent[3557]: Network Link - NIC 1 link is up 100 Mbps full duplex. Oct 30 22:08:44 shmotashNAS daemon.warn wixEvent[3557]: Network Link - NIC 1 link is down. Oct 30 22:08:46 shmotashNAS syslog.info miocrawler: +++++++++++++++ START OF ./miocrawler at 2013:10:30 - 22:08:46 [Version 01.09.00.96] ++++++++++++++ Oct 30 22:08:46 shmotashNAS syslog.info miocrawler: mc_db_init ... Oct 30 22:08:46 shmotashNAS syslog.info miocrawler: ****** database does not exist. ret = -1, creating path Oct 30 22:08:49 shmotashNAS syslog.info miocrawler: === mc_db_init ...Done. Oct 30 22:08:50 shmotashNAS syslog.info miocrawler: mcUtilsInit() Creating free queue pool Oct 30 22:08:51 shmotashNAS syslog.info miocrawler: === mcUtilsInit() Done. Oct 30 22:08:51 shmotashNAS syslog.info miocrawler: === inotify init done. Oct 30 22:08:51 shmotashNAS syslog.info miocrawler: mc_trans_updater_init() ... Oct 30 22:08:52 shmotashNAS syslog.info miocrawler: === mc_trans_updater_init() ...Done. Oct 30 22:08:52 shmotashNAS syslog.info miocrawler: === Walking directory done. Oct 30 22:08:57 shmotashNAS daemon.info wixEvent[3557]: Network Link - NIC 1 link is up 100 Mbps full duplex. Oct 30 22:08:57 shmotashNAS daemon.info wixEvent[3557]: Network IP Address - NIC 1 use static IP address 192.168.1.102 Oct 30 22:08:57 shmotashNAS daemon.info wixEvent[3557]: Network IP Address - NIC 1 use static IP address 192.168.1.102 Oct 30 22:08:57 shmotashNAS daemon.info wixEvent[3557]: Network IP Address - NIC 1 use static IP address 192.168.1.102 Oct 30 22:09:10 shmotashNAS daemon.info init: Starting pid 4605, console /dev/null: '/bin/touch' Oct 30 22:09:10 shmotashNAS daemon.info init: Starting pid 4607, console /dev/ttyS0: '/sbin/getty' Oct 30 22:09:10 shmotashNAS daemon.info wixEvent[3557]: System Startup - System startup. Oct 30 22:09:16 shmotashNAS daemon.warn wixEvent[3557]: Media Server - Media Server cannot find the path to one or more of the default folders: /Public/Shared Music, /Public/Shared Pictures or /Public/Shared Videos. Please verify that these folders have not been removed or that the names have not been changed. Oct 30 22:14:14 shmotashNAS daemon.warn wixEvent[3557]: Network Link - NIC 1 link is down. Oct 30 22:14:21 shmotashNAS daemon.info wixEvent[3557]: Network Link - NIC 1 link is up 100 Mbps full duplex. Oct 30 22:14:21 shmotashNAS daemon.info wixEvent[3557]: Network IP Address - NIC 1 use static IP address 192.168.1.102 Oct 30 22:29:36 shmotashNAS daemon.warn wixEvent[3557]: System Reboot - System will reboot. Oct 30 22:29:40 shmotashNAS daemon.info init: Starting pid 5974, console /dev/null: '/usr/bin/killall' Oct 30 22:29:40 shmotashNAS syslog.info System log daemon exiting. Oct 30 22:47:56 shmotashNAS syslog.info syslogd started: BusyBox v1.1.1 Oct 30 22:47:56 shmotashNAS daemon.warn wixEvent[3461]: Network Link - NIC 1 link is down. Oct 30 22:48:02 shmotashNAS daemon.info wixEvent[3461]: Network Link - NIC 1 link is up 100 Mbps full duplex. Oct 30 22:48:02 shmotashNAS daemon.info wixEvent[3461]: Network IP Address - NIC 1 use static IP address 192.168.1.102 Oct 30 22:48:09 shmotashNAS syslog.info miocrawler: +++++++++++++++ START OF ./miocrawler at 2013:10:30 - 22:48:09 [Version 01.09.00.96] ++++++++++++++ Oct 30 22:48:09 shmotashNAS syslog.info miocrawler: mc_db_init ... Oct 30 22:48:09 shmotashNAS syslog.info miocrawler: ++++++++ database exists: ret = 0 Oct 30 22:48:10 shmotashNAS syslog.info miocrawler: === mc_db_init ...Done. Oct 30 22:48:10 shmotashNAS syslog.info miocrawler: mcUtilsInit() Creating free queue pool Oct 30 22:48:11 shmotashNAS syslog.info miocrawler: === mcUtilsInit() Done. Oct 30 22:48:11 shmotashNAS syslog.info miocrawler: === inotify init done. Oct 30 22:48:11 shmotashNAS syslog.info miocrawler: mc_trans_updater_init() ... Oct 30 22:48:11 shmotashNAS syslog.info miocrawler: === mc_trans_updater_init() ...Done. Oct 30 22:48:11 shmotashNAS syslog.info miocrawler: === Walking directory done. Oct 30 22:48:27 shmotashNAS daemon.info init: Starting pid 4079, console /dev/null: '/bin/touch' Oct 30 22:48:27 shmotashNAS daemon.info init: Starting pid 4080, console /dev/ttyS0: '/sbin/getty' Oct 30 22:48:28 shmotashNAS daemon.info wixEvent[3461]: System Startup - System startup. Oct 30 22:49:01 shmotashNAS daemon.warn wixEvent[3461]: Media Server - Media Server cannot find the path to one or more of the default folders: /Public/Shared Music, /Public/Shared Pictures or /Public/Shared Videos. Please verify that these folders have not been removed or that the names have not been changed. Oct 30 23:51:11 shmotashNAS daemon.warn wixEvent[3461]: System Reboot - System will reboot. Oct 30 23:51:16 shmotashNAS daemon.info init: Starting pid 6498, console /dev/null: '/usr/bin/killall' Oct 30 23:51:16 shmotashNAS syslog.info System log daemon exiting. Oct 30 23:54:19 shmotashNAS syslog.info syslogd started: BusyBox v1.1.1 Oct 30 23:55:37 shmotashNAS daemon.info wixEvent[3476]: Network Link - NIC 1 link is up 100 Mbps full duplex. Oct 30 23:55:37 shmotashNAS daemon.info wixEvent[3476]: Network IP Address - NIC 1 use static IP address 192.168.1.102 Oct 30 23:55:44 shmotashNAS syslog.info miocrawler: +++++++++++++++ START OF ./miocrawler at 2013:10:30 - 23:55:44 [Version 01.09.00.96] ++++++++++++++ Oct 30 23:55:44 shmotashNAS syslog.info miocrawler: mc_db_init ... Oct 30 23:55:44 shmotashNAS syslog.info miocrawler: ++++++++ database exists: ret = 0 Oct 30 23:55:45 shmotashNAS syslog.info miocrawler: === mc_db_init ...Done. Oct 30 23:55:45 shmotashNAS syslog.info miocrawler: mcUtilsInit() Creating free queue pool Oct 30 23:55:46 shmotashNAS syslog.info miocrawler: === mcUtilsInit() Done. Oct 30 23:55:46 shmotashNAS syslog.info miocrawler: === inotify init done. Oct 30 23:55:46 shmotashNAS syslog.info miocrawler: mc_trans_updater_init() ... Oct 30 23:55:46 shmotashNAS syslog.info miocrawler: === mc_trans_updater_init() ...Done. Oct 30 23:55:46 shmotashNAS syslog.info miocrawler: === Walking directory done. Oct 30 23:55:58 shmotashNAS daemon.info init: Starting pid 4115, console /dev/null: '/bin/touch' Oct 30 23:55:58 shmotashNAS daemon.info init: Starting pid 4116, console /dev/ttyS0: '/sbin/getty' Oct 30 23:55:58 shmotashNAS daemon.info wixEvent[3476]: System Startup - System startup. Oct 30 23:56:33 shmotashNAS daemon.warn wixEvent[3476]: Media Server - Media Server cannot find the path to one or more of the default folders: /Public/Shared Music, /Public/Shared Pictures or /Public/Shared Videos. Please verify that these folders have not been removed or that the names have not been changed. Oct 31 00:29:14 shmotashNAS auth.info sshd[5409]: Server listening on 0.0.0.0 port 22. Oct 31 00:31:25 shmotashNAS auth.info sshd[5486]: Accepted password for root from 192.168.1.100 port 50785 ssh2 Oct 31 00:33:44 shmotashNAS auth.info sshd[5565]: Accepted password for root from 192.168.1.100 port 50817 ssh2 Oct 31 00:36:39 shmotashNAS daemon.info init: Starting pid 5680, console /dev/null: '/usr/bin/killall' Oct 31 00:36:39 shmotashNAS syslog.info System log daemon exiting. Oct 31 00:40:44 shmotashNAS syslog.info syslogd started: BusyBox v1.1.1 Oct 31 00:40:51 shmotashNAS daemon.info wixEvent[3464]: Network Link - NIC 1 link is up 100 Mbps full duplex. Oct 31 00:40:51 shmotashNAS daemon.info wixEvent[3464]: Network IP Address - NIC 1 use static IP address 192.168.1.102 Oct 31 00:41:00 shmotashNAS syslog.info miocrawler: +++++++++++++++ START OF ./miocrawler at 2013:10:31 - 00:41:00 [Version 01.09.00.96] ++++++++++++++ Oct 31 00:41:00 shmotashNAS syslog.info miocrawler: mc_db_init ... Oct 31 00:41:00 shmotashNAS syslog.info miocrawler: ++++++++ database exists: ret = 0 Oct 31 00:41:00 shmotashNAS syslog.info miocrawler: === mc_db_init ...Done. Oct 31 00:41:01 shmotashNAS syslog.info miocrawler: mcUtilsInit() Creating free queue pool Oct 31 00:41:02 shmotashNAS syslog.info miocrawler: === mcUtilsInit() Done. Oct 31 00:41:02 shmotashNAS syslog.info miocrawler: === inotify init done. Oct 31 00:41:02 shmotashNAS syslog.info miocrawler: mc_trans_updater_init() ... Oct 31 00:41:02 shmotashNAS syslog.info miocrawler: === mc_trans_updater_init() ...Done. Oct 31 00:41:02 shmotashNAS syslog.info miocrawler: === Walking directory done. Oct 31 00:41:14 shmotashNAS daemon.info init: Starting pid 4101, console /dev/null: '/bin/touch' Oct 31 00:41:14 shmotashNAS daemon.info init: Starting pid 4102, console /dev/ttyS0: '/sbin/getty' Oct 31 00:41:15 shmotashNAS daemon.info wixEvent[3464]: System Startup - System startup. Oct 31 00:41:47 shmotashNAS daemon.warn wixEvent[3464]: Media Server - Media Server cannot find the path to one or more of the default folders: /Public/Shared Music, /Public/Shared Pictures or /Public/Shared Videos. Please verify that these folders have not been removed or that the names have not been changed. Oct 31 01:13:19 shmotashNAS daemon.info init: Starting pid 5385, console /dev/null: '/usr/bin/killall' Oct 31 01:13:19 shmotashNAS syslog.info System log daemon exiting. Nov 1 13:26:25 shmotashNAS syslog.info syslogd started: BusyBox v1.1.1 Nov 1 13:26:32 shmotashNAS daemon.info wixEvent[3471]: Network Link - NIC 1 link is up 100 Mbps full duplex. Nov 1 13:26:32 shmotashNAS daemon.info wixEvent[3471]: Network IP Address - NIC 1 use static IP address 192.168.1.102 Nov 1 13:26:38 shmotashNAS syslog.info miocrawler: +++++++++++++++ START OF ./miocrawler at 2013:11:01 - 13:26:38 [Version 01.09.00.96] ++++++++++++++ Nov 1 13:26:38 shmotashNAS syslog.info miocrawler: mc_db_init ... Nov 1 13:26:38 shmotashNAS syslog.info miocrawler: ++++++++ database exists: ret = 0 Nov 1 13:26:39 shmotashNAS syslog.info miocrawler: === mc_db_init ...Done. Nov 1 13:26:39 shmotashNAS syslog.info miocrawler: mcUtilsInit() Creating free queue pool Nov 1 13:26:40 shmotashNAS syslog.info miocrawler: === mcUtilsInit() Done. Nov 1 13:26:40 shmotashNAS syslog.info miocrawler: === inotify init done. Nov 1 13:26:40 shmotashNAS syslog.info miocrawler: mc_trans_updater_init() ... Nov 1 13:26:40 shmotashNAS syslog.info miocrawler: === mc_trans_updater_init() ...Done. Nov 1 13:26:40 shmotashNAS syslog.info miocrawler: === Walking directory done. Nov 1 13:26:52 shmotashNAS daemon.info init: Starting pid 4078, console /dev/null: '/bin/touch' Nov 1 13:26:52 shmotashNAS daemon.info init: Starting pid 4079, console /dev/ttyS0: '/sbin/getty' Nov 1 13:26:52 shmotashNAS daemon.info wixEvent[3471]: System Startup - System startup. Nov 1 13:27:28 shmotashNAS daemon.warn wixEvent[3471]: Media Server - Media Server cannot find the path to one or more of the default folders: /Public/Shared Music, /Public/Shared Pictures or /Public/Shared Videos. Please verify that these folders have not been removed or that the names have not been changed. Nov 1 13:44:48 shmotashNAS auth.info sshd[5375]: Accepted password for root from 192.168.1.103 port 50217 ssh2 Nov 1 13:51:08 shmotashNAS auth.info sshd[5894]: Accepted password for root from 192.168.1.103 port 50380 ssh2Read the article
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How to set a imageButton is an RSS
- by L?c Song
I have a feed_layout.xml <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="vertical" > <LinearLayout android:baselineAligned="false" android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_marginTop="10dp" android:orientation="horizontal" > <LinearLayout android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:orientation="vertical" > <ImageButton android:layout_width="138dp" android:layout_height="138dp" android:layout_gravity="center" android:onClick="homeImageButton" android:scaleType="fitStart" android:src="@drawable/home" android:tag="1" /> </LinearLayout> <LinearLayout android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:orientation="vertical" > <ImageButton android:layout_width="138dp" android:layout_height="138dp" android:layout_gravity="center" android:scaleType="centerCrop" android:onClick="thegioiImageButton" android:src="@drawable/home" android:tag="2" /> </LinearLayout> </LinearLayout> <LinearLayout android:baselineAligned="false" android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_marginTop="10dp" android:orientation="horizontal" > <LinearLayout android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:orientation="vertical" > <ImageButton android:layout_width="138dp" android:layout_height="138dp" android:layout_gravity="center" android:scaleType="centerCrop" android:onClick="giaitriImageButton" android:src="@drawable/home" android:tag="3" /> </LinearLayout> <LinearLayout android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:orientation="vertical" > <ImageButton android:layout_width="138dp" android:layout_height="138dp" android:layout_gravity="center" android:scaleType="centerCrop" android:onClick="thethaoImageButton" android:src="@drawable/home" android:tag="4" /> </LinearLayout> </LinearLayout> <LinearLayout android:baselineAligned="false" android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_marginTop="10dp" android:orientation="horizontal" > <LinearLayout android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:orientation="vertical" > <ImageButton android:layout_width="138dp" android:layout_height="138dp" android:layout_gravity="center" android:scaleType="centerCrop" android:onClick="khoahocImageButton" android:src="@drawable/home" android:tag="5" /> </LinearLayout> <LinearLayout android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:orientation="vertical" > <ImageButton android:layout_width="138dp" android:layout_height="138dp" android:layout_gravity="center" android:scaleType="centerCrop" android:onClick="xeImageButton" android:src="@drawable/home" android:tag="6" /> </LinearLayout> </LinearLayout> </LinearLayout> and feedActivity.java package com.dqh.vnexpressrssreader; import android.R.string; import android.app.Activity; import android.content.Intent; import android.os.Bundle; import android.util.Log; import android.view.View; import android.widget.ImageButton; import android.widget.Toast; public class FeedActivity extends Activity { public String tagImg; private static final String TAG = "FeedActivity"; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.feed_layout); } public void homeImageButton(View v) { ImageButton imageButtonClicked = (ImageButton)v; tagImg = imageButtonClicked.getTag().toString(); setTagImg(tagImg); String tt = getTagImg(); Log.d(TAG, "FeedId: " + tt); Intent intent = new Intent(getApplicationContext(), ItemsActivity.class); startActivityForResult(intent, 0); } public void thegioiImageButton(View v) { ImageButton imageButtonClicked = (ImageButton)v; tagImg = imageButtonClicked.getTag().toString(); //Log.d(TAG, "FeedId: " + imageButtonClicked.getTag()); Log.d(TAG, "FeedId: " + tagImg); Intent intent = new Intent(getApplicationContext(), ItemsActivity.class); startActivityForResult(intent, 0); } } and RssReader.java /** * */ package com.dqh.vnexpressrssreader.reader; import java.util.ArrayList; import java.util.List; import org.json.JSONException; import org.json.JSONObject; import com.dqh.vnexpressrssreader.FeedActivity; import com.dqh.vnexpressrssreader.NewsRssReaderDB; import com.dqh.vnexpressrssreader.util.RSSHandler; import com.dqh.vnexpressrssreader.util.Tintuc; import android.content.Context; import android.text.Html; import android.util.Log; /** * @author rob * */ public class RssReader { private final static String TAG = "RssReader"; private final static String BOLD_OPEN = "<B>"; private final static String BOLD_CLOSE = "</B>"; private final static String BREAK = "<BR>"; private final static String ITALIC_OPEN = "<I>"; private final static String ITALIC_CLOSE = "</I>"; private final static String SMALL_OPEN = "<SMALL>"; private final static String SMALL_CLOSE = "</SMALL>"; /** * This method defines a feed URL and then calles our SAX Handler to read the tintuc list * from the stream * * @return List<JSONObject> - suitable for the List View activity */ public static List<JSONObject> getLatestRssFeed(Context context) { NewsRssReaderDB newsRssReaderDB = new NewsRssReaderDB(context); List<Tintuc> tintucsFromDB = newsRssReaderDB.getLists(); return fillData(tintucsFromDB); } public static void getLatestRssFeed(Context context, String feed) { NewsRssReaderDB newsRssReaderDB = new NewsRssReaderDB(context); feed = "http://vnexpress.net/rss/the-gioi.rss"; //RSS 2 feed = "http://vnexpress.net/rss/the-thao.rss"; //RSS 3 feed = "http://vnexpress.net/rss/home.rss"; RSSHandler rh = new RSSHandler(); List<Tintuc> tintucs = rh.getLatestTintucs(feed); if ((tintucs != null) && (tintucs.size() > 0)) { for (Tintuc tintuc : tintucs) { if ((tintuc.getUrl() != null) && !newsRssReaderDB.checkUrlExist(tintuc.getUrl().toString())) { long tintucId = newsRssReaderDB.insertTintuc(tintuc); if (tintucId > 0) { Log.d(TAG, "saved tintucId: " + tintucId); } else { Log.e(TAG, "saved tintucId fail"); } } else { Log.e(TAG, "tintucs exist!"); } } } } /** * This method takes a list of Tintuc objects and converts them in to the * correct JSON format so the info can be processed by our list view * * @param tintucs - list<Tintuc> * @return List<JSONObject> - suitable for the List View activity */ private static List<JSONObject> fillData(List<Tintuc> tintucs) { List<JSONObject> items = new ArrayList<JSONObject>(); for (Tintuc tintuc : tintucs) { JSONObject current = new JSONObject(); try { buildJsonObject(tintuc, current); } catch (JSONException e) { Log.e("RSS ERROR", "Error creating JSON Object from RSS feed"); } items.add(current); } return items; } /** * This method takes a single Tintuc Object and converts it in to a single JSON object * including some additional HTML formating so they can be displayed nicely * * @param tintuc * @param current * @throws JSONException */ private static void buildJsonObject(Tintuc tintuc, JSONObject current) throws JSONException { String title = tintuc.getTieude(); String description = tintuc.getMota(); ///////////////////////// //////// 2 ///////////// String date = tintuc.getPubDate(); String imgLink = tintuc.getImgLink(); StringBuffer sb = new StringBuffer(); sb.append(BOLD_OPEN).append(title).append(BOLD_CLOSE); sb.append(BREAK); sb.append(description); sb.append(BREAK); sb.append(SMALL_OPEN).append(ITALIC_OPEN).append(date).append(ITALIC_CLOSE).append(SMALL_CLOSE); current.put("text", Html.fromHtml(sb.toString())); current.put("imageLink", imgLink); current.put("url", tintuc.getUrl().toString()); current.put("title", tintuc.getTieude()); } } I have 1 array RSS and I want each ImageButton is assigned a Rss??. I have attempt to call to FeedActivity from RSSReader but not be help me !Read the article
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Loading jQuery Consistently in a .NET Web App
- by Rick Strahl
One thing that frequently comes up in discussions when using jQuery is how to best load the jQuery library (as well as other commonly used and updated libraries) in a Web application. Specifically the issue is the one of versioning and making sure that you can easily update and switch versions of script files with application wide settings in one place and having your script usage reflect those settings in the entire application on all pages that use the script. Although I use jQuery as an example here, the same concepts can be applied to any script library - for example in my Web libraries I use the same approach for jQuery.ui and my own internal jQuery support library. The concepts used here can be applied both in WebForms and MVC. Loading jQuery Properly From CDN Before we look at a generic way to load jQuery via some server logic, let me first point out my preferred way to embed jQuery into the page. I use the Google CDN to load jQuery and then use a fallback URL to handle the offline or no Internet connection scenario. Why use a CDN? CDN links tend to be loaded more quickly since they are very likely to be cached in user's browsers already as jQuery CDN is used by many, many sites on the Web. Using a CDN also removes load from your Web server and puts the load bearing on the CDN provider - in this case Google - rather than on your Web site. On the downside, CDN links gives the provider (Google, Microsoft) yet another way to track users through their Web usage. Here's how I use jQuery CDN plus a fallback link on my WebLog for example: <!DOCTYPE HTML> <html> <head> <script src="//ajax.googleapis.com/ajax/libs/jquery/1.6.4/jquery.min.js"></script> <script> if (typeof (jQuery) == 'undefined') document.write(unescape("%3Cscript " + "src='/Weblog/wwSC.axd?r=Westwind.Web.Controls.Resources.jquery.js' %3E%3C/script%3E")); </script> <title>Rick Strahl's Web Log</title> ... </head> You can see that the CDN is referenced first, followed by a small script block that checks to see whether jQuery was loaded (jQuery object exists). If it didn't load another script reference is added to the document dynamically pointing to a backup URL. In this case my backup URL points at a WebResource in my Westwind.Web assembly, but the URL can also be local script like src="/scripts/jquery.min.js". Important: Use the proper Protocol/Scheme for for CDN Urls [updated based on comments] If you're using a CDN to load an external script resource you should always make sure that the script is loaded with the same protocol as the parent page to avoid mixed content warnings by the browser. You don't want to load a script link to an http:// resource when you're on an https:// page. The easiest way to use this is by using a protocol relative URL: <script src="//ajax.googleapis.com/ajax/libs/jquery/1.6.4/jquery.min.js"></script> which is an easy way to load resources from other domains. This URL syntax will automatically use the parent page's protocol (or more correctly scheme). As long as the remote domains support both http:// and https:// access this should work. BTW this also works in CSS (with some limitations) and links. BTW, I didn't know about this until it was pointed out in the comments. This is a very useful feature for many things - ah the benefits of my blog to myself :-) Version Numbers When you use a CDN you notice that you have to reference a specific version of jQuery. When using local files you may not have to do this as you can rename your private copy of jQuery.js, but for CDN the references are always versioned. The version number is of course very important to ensure you getting the version you have tested with, but it's also important to the provider because it ensures that cached content is always correct. If an existing file was updated the updates might take a very long time to get past the locally cached content and won't refresh properly. The version number ensures you get the right version and not some cached content that has been changed but not updated in your cache. On the other hand version numbers also mean that once you decide to use a new version of the script you now have to change all your script references in your pages. Depending on whether you use some sort of master/layout page or not this may or may not be easy in your application. Even if you do use master/layout pages, chances are that you probably have a few of them and at the very least all of those have to be updated for the scripts. If you use individual pages for all content this issue then spreads to all of your pages. Search and Replace in Files will do the trick, but it's still something that's easy to forget and worry about. Personaly I think it makes sense to have a single place where you can specify common script libraries that you want to load and more importantly which versions thereof and where they are loaded from. Loading Scripts via Server Code Script loading has always been important to me and as long as I can remember I've always built some custom script loading routines into my Web frameworks. WebForms makes this fairly easy because it has a reasonably useful script manager (ClientScriptManager and the ScriptManager) which allow injecting script into the page easily from anywhere in the Page cycle. What's nice about these components is that they allow scripts to be injected by controls so components can wrap up complex script/resource dependencies more easily without having to require long lists of CSS/Scripts/Image includes. In MVC or pure script driven applications like Razor WebPages the process is more raw, requiring you to embed script references in the right place. But its also more immediate - it lets you know exactly which versions of scripts to use because you have to manually embed them. In WebForms with different controls loading resources this often can get confusing because it's quite possible to load multiple versions of the same script library into a page, the results of which are less than optimal… In this post I look a simple routine that embeds jQuery into the page based on a few application wide configuration settings. It returns only a string of the script tags that can be manually embedded into a Page template. It's a small function that merely a string of the script tags shown at the begging of this post along with some options on how that string is comprised. You'll be able to specify in one place which version loads and then all places where the help function is used will automatically reflect this selection. Options allow specification of the jQuery CDN Url, the fallback Url and where jQuery should be loaded from (script folder, Resource or CDN in my case). While this is specific to jQuery you can apply this to other resources as well. For example I use a similar approach with jQuery.ui as well using practically the same semantics. Providing Resources in ControlResources In my Westwind.Web Web utility library I have a class called ControlResources which is responsible for holding resource Urls, resource IDs and string contants that reference those resource IDs. The library also provides a few helper methods for loading common scriptscripts into a Web page. There are specific versions for WebForms which use the ClientScriptManager/ScriptManager and script link methods that can be used in any .NET technology that can embed an expression into the output template (or code for that matter). The ControlResources class contains mostly static content - references to resources mostly. But it also contains a few static properties that configure script loading: A Script LoadMode (CDN, Resource, or script url) A default CDN Url A fallback url They are static properties in the ControlResources class: public class ControlResources { /// <summary> /// Determines what location jQuery is loaded from /// </summary> public static JQueryLoadModes jQueryLoadMode = JQueryLoadModes.ContentDeliveryNetwork; /// <summary> /// jQuery CDN Url on Google /// </summary> public static string jQueryCdnUrl = "//ajax.googleapis.com/ajax/libs/jquery/1.6.4/jquery.min.js"; /// <summary> /// jQuery CDN Url on Google /// </summary> public static string jQueryUiCdnUrl = "//ajax.googleapis.com/ajax/libs/jqueryui/1.8.16/jquery-ui.min.js"; /// <summary> /// jQuery UI fallback Url if CDN is unavailable or WebResource is used /// Note: The file needs to exist and hold the minimized version of jQuery ui /// </summary> public static string jQueryUiLocalFallbackUrl = "~/scripts/jquery-ui.min.js"; } These static properties are fixed values that can be changed at application startup to reflect your preferences. Since they're static they are application wide settings and respected across the entire Web application running. It's best to set these default in Application_Init or similar startup code if you need to change them for your application: protected void Application_Start(object sender, EventArgs e) { // Force jQuery to be loaded off Google Content Network ControlResources.jQueryLoadMode = JQueryLoadModes.ContentDeliveryNetwork; // Allow overriding of the Cdn url ControlResources.jQueryCdnUrl = "http://ajax.googleapis.com/ajax/libs/jquery/1.6.2/jquery.min.js"; // Route to our own internal handler App.OnApplicationStart(); } With these basic settings in place you can then embed expressions into a page easily. In WebForms use: <!DOCTYPE html> <html> <head runat="server"> <%= ControlResources.jQueryLink() %> <script src="scripts/ww.jquery.min.js"></script> </head> In Razor use: <!DOCTYPE html> <html> <head> @Html.Raw(ControlResources.jQueryLink()) <script src="scripts/ww.jquery.min.js"></script> </head> Note that in Razor you need to use @Html.Raw() to force the string NOT to escape. Razor by default escapes string results and this ensures that the HTML content is properly expanded as raw HTML text. Both the WebForms and Razor output produce: <!DOCTYPE html> <html> <head> <script src="http://ajax.googleapis.com/ajax/libs/jquery/1.6.2/jquery.min.js" type="text/javascript"></script> <script type="text/javascript"> if (typeof (jQuery) == 'undefined') document.write(unescape("%3Cscript src='/WestWindWebToolkitWeb/WebResource.axd?d=-b6oWzgbpGb8uTaHDrCMv59VSmGhilZP5_T_B8anpGx7X-PmW_1eu1KoHDvox-XHqA1EEb-Tl2YAP3bBeebGN65tv-7-yAimtG4ZnoWH633pExpJor8Qp1aKbk-KQWSoNfRC7rQJHXVP4tC0reYzVw2&t=634535391996872492' type='text/javascript'%3E%3C/script%3E"));</script> <script src="scripts/ww.jquery.min.js"></script> </head> which produces the desired effect for both CDN load and fallback URL. The implementation of jQueryLink is pretty basic of course: /// <summary> /// Inserts a script link to load jQuery into the page based on the jQueryLoadModes settings /// of this class. Default load is by CDN plus WebResource fallback /// </summary> /// <param name="url"> /// An optional explicit URL to load jQuery from. Url is resolved. /// When specified no fallback is applied /// </param> /// <returns>full script tag and fallback script for jQuery to load</returns> public static string jQueryLink(JQueryLoadModes jQueryLoadMode = JQueryLoadModes.Default, string url = null) { string jQueryUrl = string.Empty; string fallbackScript = string.Empty; if (jQueryLoadMode == JQueryLoadModes.Default) jQueryLoadMode = ControlResources.jQueryLoadMode; if (!string.IsNullOrEmpty(url)) jQueryUrl = WebUtils.ResolveUrl(url); else if (jQueryLoadMode == JQueryLoadModes.WebResource) { Page page = new Page(); jQueryUrl = page.ClientScript.GetWebResourceUrl(typeof(ControlResources), ControlResources.JQUERY_SCRIPT_RESOURCE); } else if (jQueryLoadMode == JQueryLoadModes.ContentDeliveryNetwork) { jQueryUrl = ControlResources.jQueryCdnUrl; if (!string.IsNullOrEmpty(jQueryCdnUrl)) { // check if jquery loaded - if it didn't we're not online and use WebResource fallbackScript = @"<script type=""text/javascript"">if (typeof(jQuery) == 'undefined') document.write(unescape(""%3Cscript src='{0}' type='text/javascript'%3E%3C/script%3E""));</script>"; fallbackScript = string.Format(fallbackScript, WebUtils.ResolveUrl(ControlResources.jQueryCdnFallbackUrl)); } } string output = "<script src=\"" + jQueryUrl + "\" type=\"text/javascript\"></script>"; // add in the CDN fallback script code if (!string.IsNullOrEmpty(fallbackScript)) output += "\r\n" + fallbackScript + "\r\n"; return output; } There's one dependency here on WebUtils.ResolveUrl() which resolves Urls without access to a Page/Control (another one of those features that should be in the runtime, not in the WebForms or MVC engine). You can see there's only a little bit of logic in this code that deals with potentially different load modes. I can load scripts from a Url, WebResources or - my preferred way - from CDN. Based on the static settings the scripts to embed are composed to be returned as simple string <script> tag(s). I find this extremely useful especially when I'm not connected to the internet so that I can quickly swap in a local jQuery resource instead of loading from CDN. While CDN loading with the fallback works it can be a bit slow as the CDN is probed first before the fallback kicks in. Switching quickly in one place makes this trivial. It also makes it very easy once a new version of jQuery rolls around to move up to the new version and ensure that all pages are using the new version immediately. I'm not trying to make this out as 'the' definite way to load your resources, but rather provide it here as a pointer so you can maybe apply your own logic to determine where scripts come from and how they load. You could even automate this some more by using configuration settings or reading the locations/preferences out of some sort of data/metadata store that can be dynamically updated instead via recompilation. FWIW, I use a very similar approach for loading jQuery UI and my own ww.jquery library - the same concept can be applied to any kind of script you might be loading from different locations. Hopefully some of you find this a useful addition to your toolset. Resources Google CDN for jQuery Full ControlResources Source Code ControlResource Documentation Westwind.Web NuGet This method is part of the Westwind.Web library of the West Wind Web Toolkit or you can grab the Web library from NuGet and add to your Visual Studio project. This package includes a host of Web related utilities and script support features. © Rick Strahl, West Wind Technologies, 2005-2011Posted in ASP.NET jQuery Tweet (function() { var po = document.createElement('script'); po.type = 'text/javascript'; po.async = true; po.src = 'https://apis.google.com/js/plusone.js'; var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(po, s); })();Read the article
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[Windows 8] Update TextBox’s binding on TextChanged
- by Benjamin Roux
Since UpdateSourceTrigger is not available in WinRT we cannot update the text’s binding of a TextBox at will (or at least not easily) especially when using MVVM (I surely don’t want to write behind-code to do that in each of my apps !). Since this kind of demand is frequent (for example to disable of button if the TextBox is empty) I decided to create some attached properties to to simulate this missing behavior. namespace Indeed.Controls { public static class TextBoxEx { public static string GetRealTimeText(TextBox obj) { return (string)obj.GetValue(RealTimeTextProperty); } public static void SetRealTimeText(TextBox obj, string value) { obj.SetValue(RealTimeTextProperty, value); } public static readonly DependencyProperty RealTimeTextProperty = DependencyProperty.RegisterAttached("RealTimeText", typeof(string), typeof(TextBoxEx), null); public static bool GetIsAutoUpdate(TextBox obj) { return (bool)obj.GetValue(IsAutoUpdateProperty); } public static void SetIsAutoUpdate(TextBox obj, bool value) { obj.SetValue(IsAutoUpdateProperty, value); } public static readonly DependencyProperty IsAutoUpdateProperty = DependencyProperty.RegisterAttached("IsAutoUpdate", typeof(bool), typeof(TextBoxEx), new PropertyMetadata(false, OnIsAutoUpdateChanged)); private static void OnIsAutoUpdateChanged(DependencyObject sender, DependencyPropertyChangedEventArgs e) { var value = (bool)e.NewValue; var textbox = (TextBox)sender; if (value) { Observable.FromEventPattern<TextChangedEventHandler, TextChangedEventArgs>( o => textbox.TextChanged += o, o => textbox.TextChanged -= o) .Do(_ => textbox.SetValue(TextBoxEx.RealTimeTextProperty, textbox.Text)) .Subscribe(); } } } } .csharpcode, .csharpcode pre { font-size: small; color: black; font-family: consolas, "Courier New", courier, monospace; background-color: #ffffff; /*white-space: pre;*/ } .csharpcode pre { margin: 0em; } .csharpcode .rem { color: #008000; } .csharpcode .kwrd { color: #0000ff; } .csharpcode .str { color: #006080; } .csharpcode .op { color: #0000c0; } .csharpcode .preproc { color: #cc6633; } .csharpcode .asp { background-color: #ffff00; } .csharpcode .html { color: #800000; } .csharpcode .attr { color: #ff0000; } .csharpcode .alt { background-color: #f4f4f4; width: 100%; margin: 0em; } .csharpcode .lnum { color: #606060; } The code is composed of two attached properties. The first one “RealTimeText” reflects the text in real time (updated after each TextChanged event). The second one is only used to enable the functionality. To subscribe to the TextChanged event I used Reactive Extensions (Rx-Metro package in Nuget). If you’re not familiar with this framework just replace the code with a simple: textbox.TextChanged += textbox.SetValue(TextBoxEx.RealTimeTextProperty, textbox.Text); .csharpcode, .csharpcode pre { font-size: small; color: black; font-family: consolas, "Courier New", courier, monospace; background-color: #ffffff; /*white-space: pre;*/ } .csharpcode pre { margin: 0em; } .csharpcode .rem { color: #008000; } .csharpcode .kwrd { color: #0000ff; } .csharpcode .str { color: #006080; } .csharpcode .op { color: #0000c0; } .csharpcode .preproc { color: #cc6633; } .csharpcode .asp { background-color: #ffff00; } .csharpcode .html { color: #800000; } .csharpcode .attr { color: #ff0000; } .csharpcode .alt { background-color: #f4f4f4; width: 100%; margin: 0em; } .csharpcode .lnum { color: #606060; } To use these attached properties, it’s fairly simple <TextBox Text="{Binding Path=MyProperty, Mode=TwoWay}" ic:TextBoxEx.IsAutoUpdate="True" ic:TextBoxEx.RealTimeText="{Binding Path=MyProperty, Mode=TwoWay}" /> .csharpcode, .csharpcode pre { font-size: small; color: black; font-family: consolas, "Courier New", courier, monospace; background-color: #ffffff; /*white-space: pre;*/ } .csharpcode pre { margin: 0em; } .csharpcode .rem { color: #008000; } .csharpcode .kwrd { color: #0000ff; } .csharpcode .str { color: #006080; } .csharpcode .op { color: #0000c0; } .csharpcode .preproc { color: #cc6633; } .csharpcode .asp { background-color: #ffff00; } .csharpcode .html { color: #800000; } .csharpcode .attr { color: #ff0000; } .csharpcode .alt { background-color: #f4f4f4; width: 100%; margin: 0em; } .csharpcode .lnum { color: #606060; } Just make sure to create a binding (in TwoWay) for both Text and RealTimeText. Hope this helps !Read the article
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Silverlight for Windows Embedded tutorial (step 6)
- by Valter Minute
In this tutorial step we will develop a very simple clock application that may be used as a screensaver on our devices and will allow us to discover a new feature of Silverlight for Windows Embedded (transforms) and how to use an “old” feature of Windows CE (timers) inside a Silverlight for Windows Embedded application. Let’s start with some XAML, as usual: <UserControl xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Width="640" Height="480" FontSize="18" x:Name="Clock"> <Canvas x:Name="LayoutRoot" Background="#FF000000"> <Grid Height="24" Width="150" Canvas.Left="320" Canvas.Top="234" x:Name="SecondsHand" Background="#FFFF0000"> <TextBlock Text="Seconds" TextWrapping="Wrap" Width="50" HorizontalAlignment="Right" VerticalAlignment="Center" x:Name="SecondsText" Foreground="#FFFFFFFF" TextAlignment="Right" Margin="2,2,2,2"/> </Grid> <Grid Height="24" x:Name="MinutesHand" Width="100" Background="#FF00FF00" Canvas.Left="320" Canvas.Top="234"> <TextBlock HorizontalAlignment="Right" x:Name="MinutesText" VerticalAlignment="Center" Width="50" Text="Minutes" TextWrapping="Wrap" Foreground="#FFFFFFFF" TextAlignment="Right" Margin="2,2,2,2"/> </Grid> <Grid Height="24" x:Name="HoursHand" Width="50" Background="#FF0000FF" Canvas.Left="320" Canvas.Top="234"> <TextBlock HorizontalAlignment="Right" x:Name="HoursText" VerticalAlignment="Center" Width="50" Text="Hours" TextWrapping="Wrap" Foreground="#FFFFFFFF" TextAlignment="Right" Margin="2,2,2,2"/> </Grid> </Canvas> </UserControl> This XAML file defines three grid panels, one for each hand of our clock (we are implementing an analog clock using one of the most advanced technologies of the digital world… how cool is that?). Inside each hand we put a TextBlock that will be used to display the current hour, minute, second inside the dial (you can’t do that on plain old analog clocks, but it looks nice). As usual we use XAML2CPP to generate the boring part of our code. We declare a class named “Clock” and derives from the TClock template that XAML2CPP has declared for us. class Clock : public TClock<Clock> { ... }; Our WinMain function is more or less the same we used in all the previous samples. It initializes the XAML runtime, create an instance of our class, initialize it and shows it as a dialog: int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPTSTR lpCmdLine, int nCmdShow) { if (!XamlRuntimeInitialize()) return -1; HRESULT retcode; IXRApplicationPtr app; if (FAILED(retcode=GetXRApplicationInstance(&app))) return -1; Clock clock; if (FAILED(clock.Init(hInstance,app))) return -1; UINT exitcode; if (FAILED(clock.GetVisualHost()->StartDialog(&exitcode))) return -1; return exitcode; } Silverlight for Windows Embedded provides a lot of features to implement our UI, but it does not provide timers. How we can update our clock if we don’t have a timer feature? We just use plain old Windows timers, as we do in “regular” Windows CE applications! To use a timer in WinCE we should declare an id for it: #define IDT_CLOCKUPDATE 0x12341234 We also need an HWND that will be used to receive WM_TIMER messages. Our Silverlight for Windows Embedded page is “hosted” inside a GWES Window and we can retrieve its handle using the GetContainerHWND function of our VisualHost object. Let’s see how this is implemented inside our Clock class’ Init method: HRESULT Init(HINSTANCE hInstance,IXRApplication* app) { HRESULT retcode; if (FAILED(retcode=TClock<Clock>::Init(hInstance,app))) return retcode; // create the timer user to update the clock HWND clockhwnd; if (FAILED(GetVisualHost()->GetContainerHWND(&clockhwnd))) return -1; timer=SetTimer(clockhwnd,IDT_CLOCKUPDATE,1000,NULL); return 0; } We use SetTimer to create a new timer and GWES will send a WM_TIMER to our window every second, giving us a chance to update our clock. That sounds great… but how could we handle the WM_TIMER message if we didn’t implement a window procedure for our window? We have to move a step back and look how a visual host is created. This code is generated by XAML2CPP and is inside xaml2cppbase.h: virtual HRESULT CreateHost(HINSTANCE hInstance,IXRApplication* app) { HRESULT retcode; XRWindowCreateParams wp; ZeroMemory(&wp, sizeof(XRWindowCreateParams)); InitWindowParms(&wp); XRXamlSource xamlsrc; SetXAMLSource(hInstance,&xamlsrc); if (FAILED(retcode=app->CreateHostFromXaml(&xamlsrc, &wp, &vhost))) return retcode; if (FAILED(retcode=vhost->GetRootElement(&root))) return retcode; return S_OK; } As you can see the CreateHostFromXaml function of IXRApplication accepts a structure named XRWindowCreateParams that control how the “plain old” GWES Window is created by the runtime. This structure is initialized inside the InitWindowParm method: // Initializes Windows parameters, can be overridden in the user class to change its appearance virtual void InitWindowParms(XRWindowCreateParams* wp) { wp->Style = WS_OVERLAPPED; wp->pTitle = windowtitle; wp->Left = 0; wp->Top = 0; } This method set up the window style, title and position. But the XRWindowCreateParams contains also other fields and, since the function is declared as virtual, we could initialize them inside our version of InitWindowParms: // add hook procedure to the standard windows creation parms virtual void InitWindowParms(XRWindowCreateParams* wp) { TClock<Clock>::InitWindowParms(wp); wp->pHookProc=StaticHostHookProc; wp->pvUserParam=this; } This method calls the base class implementation (useful to not having to re-write some code, did I told you that I’m quite lazy?) and then initializes the pHookProc and pvUserParam members of the XRWindowsCreateParams structure. Those members will allow us to install a “hook” procedure that will be called each time the GWES window “hosting” our Silverlight for Windows Embedded UI receives a message. We can declare a hook procedure inside our Clock class: // static hook procedure static BOOL CALLBACK StaticHostHookProc(VOID* pv,HWND hwnd,UINT Msg,WPARAM wParam,LPARAM lParam,LRESULT* pRetVal) { ... } You should notice two things here. First that the function is declared as static. This is required because a non-static function has a “hidden” parameters, that is the “this” pointer of our object. Having an extra parameter is not allowed for the type defined for the pHookProc member of the XRWindowsCreateParams struct and so we should implement our hook procedure as static. But in a static procedure we will not have a this pointer. How could we access the data member of our class? Here’s the second thing to notice. We initialized also the pvUserParam of the XRWindowsCreateParams struct. We set it to our this pointer. This value will be passed as the first parameter of the hook procedure. In this way we can retrieve our this pointer and use it to call a non-static version of our hook procedure: // static hook procedure static BOOL CALLBACK StaticHostHookProc(VOID* pv,HWND hwnd,UINT Msg,WPARAM wParam,LPARAM lParam,LRESULT* pRetVal) { return ((Clock*)pv)->HostHookProc(hwnd,Msg,wParam,lParam,pRetVal); } Inside our non-static hook procedure we will have access to our this pointer and we will be able to update our clock: // hook procedure (handles timers) BOOL HostHookProc(HWND hwnd,UINT Msg,WPARAM wParam,LPARAM lParam,LRESULT* pRetVal) { switch (Msg) { case WM_TIMER: if (wParam==IDT_CLOCKUPDATE) UpdateClock(); *pRetVal=0; return TRUE; } return FALSE; } The UpdateClock member function will update the text inside our TextBlocks and rotate the hands to reflect current time: // udates Hands positions and labels HRESULT UpdateClock() { SYSTEMTIME time; HRESULT retcode; GetLocalTime(&time); //updates the text fields TCHAR timebuffer[32]; _itow(time.wSecond,timebuffer,10); SecondsText->SetText(timebuffer); _itow(time.wMinute,timebuffer,10); MinutesText->SetText(timebuffer); _itow(time.wHour,timebuffer,10); HoursText->SetText(timebuffer); if (FAILED(retcode=RotateHand(((float)time.wSecond)*6-90,SecondsHand))) return retcode; if (FAILED(retcode=RotateHand(((float)time.wMinute)*6-90,MinutesHand))) return retcode; if (FAILED(retcode=RotateHand(((float)(time.wHour%12))*30-90,HoursHand))) return retcode; return S_OK; } The function retrieves current time, convert hours, minutes and seconds to strings and display those strings inside the three TextBlocks that we put inside our clock hands. Then it rotates the hands to position them at the right angle (angles are in degrees and we have to subtract 90 degrees because 0 degrees means horizontal on Silverlight for Windows Embedded and usually a clock 0 is in the top position of the dial. The code of the RotateHand function uses transforms to rotate our clock hands on the screen: // rotates a Hand HRESULT RotateHand(float angle,IXRFrameworkElement* Hand) { HRESULT retcode; IXRRotateTransformPtr rotatetransform; IXRApplicationPtr app; if (FAILED(retcode=GetXRApplicationInstance(&app))) return retcode; if (FAILED(retcode=app->CreateObject(IID_IXRRotateTransform,&rotatetransform))) return retcode; if (FAILED(retcode=rotatetransform->SetAngle(angle))) return retcode; if (FAILED(retcode=rotatetransform->SetCenterX(0.0))) return retcode; float height; if (FAILED(retcode==Hand->GetActualHeight(&height))) return retcode; if (FAILED(retcode=rotatetransform->SetCenterY(height/2))) return retcode; if (FAILED(retcode=Hand->SetRenderTransform(rotatetransform))) return retcode; return S_OK; } It creates a IXRotateTransform object, set its rotation angle and origin (the default origin is at the top-left corner of our Grid panel, we move it in the vertical center to keep the hand rotating around a single point in a more “clock like” way. Then we can apply the transform to our UI object using SetRenderTransform. Every UI element (derived from IXRFrameworkElement) can be rotated! And using different subclasses of IXRTransform also moved, scaled, skewed and distorted in many ways. You can also concatenate multiple transforms and apply them at once suing a IXRTransformGroup object. The XAML engine uses vector graphics and object will not look “pixelated” when they are rotated or scaled. As usual you can download the code here: http://cid-9b7b0aefe3514dc5.skydrive.live.com/self.aspx/.Public/Clock.zip If you read up to (down to?) this point you seem to be interested in Silverlight for Windows Embedded. If you want me to discuss some specific topic, please feel free to point it out in the comments! Technorati Tags: Silverlight for Windows Embedded,Windows CERead the article
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C#: Adding Functionality to 3rd Party Libraries With Extension Methods
- by James Michael Hare
Ever have one of those third party libraries that you love but it's missing that one feature or one piece of syntactical candy that would make it so much more useful? This, I truly think, is one of the best uses of extension methods. I began discussing extension methods in my last post (which you find here) where I expounded upon what I thought were some rules of thumb for using extension methods correctly. As long as you keep in line with those (or similar) rules, they can often be useful for adding that little extra functionality or syntactical simplification for a library that you have little or no control over. Oh sure, you could take an open source project, download the source and add the methods you want, but then every time the library is updated you have to re-add your changes, which can be cumbersome and error prone. And yes, you could possibly extend a class in a third party library and override features, but that's only if the class is not sealed, static, or constructed via factories. This is the perfect place to use an extension method! And the best part is, you and your development team don't need to change anything! Simply add the using for the namespace the extensions are in! So let's consider this example. I love log4net! Of all the logging libraries I've played with, it, to me, is one of the most flexible and configurable logging libraries and it performs great. But this isn't about log4net, well, not directly. So why would I want to add functionality? Well, it's missing one thing I really want in the ILog interface: ability to specify logging level at runtime. For example, let's say I declare my ILog instance like so: using log4net; public class LoggingTest { private static readonly ILog _log = LogManager.GetLogger(typeof(LoggingTest)); ... } If you don't know log4net, the details aren't important, just to show that the field _log is the logger I have gotten from log4net. So now that I have that, I can log to it like so: _log.Debug("This is the lowest level of logging and just for debugging output."); _log.Info("This is an informational message. Usual normal operation events."); _log.Warn("This is a warning, something suspect but not necessarily wrong."); _log.Error("This is an error, some sort of processing problem has happened."); _log.Fatal("Fatals usually indicate the program is dying hideously."); And there's many flavors of each of these to log using string formatting, to log exceptions, etc. But one thing there isn't: the ability to easily choose the logging level at runtime. Notice, the logging levels above are chosen at compile time. Of course, you could do some fun stuff with lambdas and wrap it, but that would obscure the simplicity of the interface. And yes there is a Logger property you can dive down into where you can specify a Level, but the Level properties don't really match the ILog interface exactly and then you have to manually build a LogEvent and... well, it gets messy. I want something simple and sexy so I can say: _log.Log(someLevel, "This will be logged at whatever level I choose at runtime!"); Now, some purists out there might say you should always know what level you want to log at, and for the most part I agree with them. For the most party the ILog interface satisfies 99% of my needs. In fact, for most application logging yes you do always know the level you will be logging at, but when writing a utility class, you may not always know what level your user wants. I'll tell you, one of my favorite things is to write reusable components. If I had my druthers I'd write framework libraries and shared components all day! And being able to easily log at a runtime-chosen level is a big need for me. After all, if I want my code to really be re-usable, I shouldn't force a user to deal with the logging level I choose. One of my favorite uses for this is in Interceptors -- I'll describe Interceptors in my next post and some of my favorites -- for now just know that an Interceptor wraps a class and allows you to add functionality to an existing method without changing it's signature. At the risk of over-simplifying, it's a very generic implementation of the Decorator design pattern. So, say for example that you were writing an Interceptor that would time method calls and emit a log message if the method call execution time took beyond a certain threshold of time. For instance, maybe if your database calls take more than 5,000 ms, you want to log a warning. Or if a web method call takes over 1,000 ms, you want to log an informational message. This would be an excellent use of logging at a generic level. So here was my personal wish-list of requirements for my task: Be able to determine if a runtime-specified logging level is enabled. Be able to log generically at a runtime-specified logging level. Have the same look-and-feel of the existing Debug, Info, Warn, Error, and Fatal calls. Having the ability to also determine if logging for a level is on at runtime is also important so you don't spend time building a potentially expensive logging message if that level is off. Consider an Interceptor that may log parameters on entrance to the method. If you choose to log those parameter at DEBUG level and if DEBUG is not on, you don't want to spend the time serializing those parameters. Now, mine may not be the most elegant solution, but it performs really well since the enum I provide all uses contiguous values -- while it's never guaranteed, contiguous switch values usually get compiled into a jump table in IL which is VERY performant - O(1) - but even if it doesn't, it's still so fast you'd never need to worry about it. So first, I need a way to let users pass in logging levels. Sure, log4net has a Level class, but it's a class with static members and plus it provides way too many options compared to ILog interface itself -- and wouldn't perform as well in my level-check -- so I define an enum like below. namespace Shared.Logging.Extensions { // enum to specify available logging levels. public enum LoggingLevel { Debug, Informational, Warning, Error, Fatal } } Now, once I have this, writing the extension methods I need is trivial. Once again, I would typically /// comment fully, but I'm eliminating for blogging brevity: namespace Shared.Logging.Extensions { // the extension methods to add functionality to the ILog interface public static class LogExtensions { // Determines if logging is enabled at a given level. public static bool IsLogEnabled(this ILog logger, LoggingLevel level) { switch (level) { case LoggingLevel.Debug: return logger.IsDebugEnabled; case LoggingLevel.Informational: return logger.IsInfoEnabled; case LoggingLevel.Warning: return logger.IsWarnEnabled; case LoggingLevel.Error: return logger.IsErrorEnabled; case LoggingLevel.Fatal: return logger.IsFatalEnabled; } return false; } // Logs a simple message - uses same signature except adds LoggingLevel public static void Log(this ILog logger, LoggingLevel level, object message) { switch (level) { case LoggingLevel.Debug: logger.Debug(message); break; case LoggingLevel.Informational: logger.Info(message); break; case LoggingLevel.Warning: logger.Warn(message); break; case LoggingLevel.Error: logger.Error(message); break; case LoggingLevel.Fatal: logger.Fatal(message); break; } } // Logs a message and exception to the log at specified level. public static void Log(this ILog logger, LoggingLevel level, object message, Exception exception) { switch (level) { case LoggingLevel.Debug: logger.Debug(message, exception); break; case LoggingLevel.Informational: logger.Info(message, exception); break; case LoggingLevel.Warning: logger.Warn(message, exception); break; case LoggingLevel.Error: logger.Error(message, exception); break; case LoggingLevel.Fatal: logger.Fatal(message, exception); break; } } // Logs a formatted message to the log at the specified level. public static void LogFormat(this ILog logger, LoggingLevel level, string format, params object[] args) { switch (level) { case LoggingLevel.Debug: logger.DebugFormat(format, args); break; case LoggingLevel.Informational: logger.InfoFormat(format, args); break; case LoggingLevel.Warning: logger.WarnFormat(format, args); break; case LoggingLevel.Error: logger.ErrorFormat(format, args); break; case LoggingLevel.Fatal: logger.FatalFormat(format, args); break; } } } } So there it is! I didn't have to modify the log4net source code, so if a new version comes out, i can just add the new assembly with no changes. I didn't have to subclass and worry about developers not calling my sub-class instead of the original. I simply provide the extension methods and it's as if the long lost extension methods were always a part of the ILog interface! Consider a very contrived example using the original interface: // using the original ILog interface public class DatabaseUtility { private static readonly ILog _log = LogManager.Create(typeof(DatabaseUtility)); // some theoretical method to time IDataReader Execute(string statement) { var timer = new System.Diagnostics.Stopwatch(); // do DB magic // this is hard-coded to warn, if want to change at runtime tough luck! if (timer.ElapsedMilliseconds > 5000 && _log.IsWarnEnabled) { _log.WarnFormat("Statement {0} took too long to execute.", statement); } ... } } Now consider this alternate call where the logging level could be perhaps a property of the class // using the original ILog interface public class DatabaseUtility { private static readonly ILog _log = LogManager.Create(typeof(DatabaseUtility)); // allow logging level to be specified by user of class instead public LoggingLevel ThresholdLogLevel { get; set; } // some theoretical method to time IDataReader Execute(string statement) { var timer = new System.Diagnostics.Stopwatch(); // do DB magic // this is hard-coded to warn, if want to change at runtime tough luck! if (timer.ElapsedMilliseconds > 5000 && _log.IsLogEnabled(ThresholdLogLevel)) { _log.LogFormat(ThresholdLogLevel, "Statement {0} took too long to execute.", statement); } ... } } Next time, I'll show one of my favorite uses for these extension methods in an Interceptor.Read the article
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How I understood monads, part 1/2: sleepless and self-loathing in Seattle
- by Bertrand Le Roy
For some time now, I had been noticing some interest for monads, mostly in the form of unintelligible (to me) blog posts and comments saying “oh, yeah, that’s a monad” about random stuff as if it were absolutely obvious and if I didn’t know what they were talking about, I was probably an uneducated idiot, ignorant about the simplest and most fundamental concepts of functional programming. Fair enough, I am pretty much exactly that. Being the kind of guy who can spend eight years in college just to understand a few interesting concepts about the universe, I had to check it out and try to understand monads so that I too can say “oh, yeah, that’s a monad”. Man, was I hit hard in the face with the limitations of my own abstract thinking abilities. All the articles I could find about the subject seemed to be vaguely understandable at first but very quickly overloaded the very few concept slots I have available in my brain. They also seemed to be consistently using arcane notation that I was entirely unfamiliar with. It finally all clicked together one Friday afternoon during the team’s beer symposium when Louis was patient enough to break it down for me in a language I could understand (C#). I don’t know if being intoxicated helped. Feel free to read this with or without a drink in hand. So here it is in a nutshell: a monad allows you to manipulate stuff in interesting ways. Oh, OK, you might say. Yeah. Exactly. Let’s start with a trivial case: public static class Trivial { public static TResult Execute<T, TResult>( this T argument, Func<T, TResult> operation) { return operation(argument); } } This is not a monad. I removed most concepts here to start with something very simple. There is only one concept here: the idea of executing an operation on an object. This is of course trivial and it would actually be simpler to just apply that operation directly on the object. But please bear with me, this is our first baby step. Here’s how you use that thing: "some string" .Execute(s => s + " processed by trivial proto-monad.") .Execute(s => s + " And it's chainable!"); What we’re doing here is analogous to having an assembly chain in a factory: you can feed it raw material (the string here) and a number of machines that each implement a step in the manufacturing process and you can start building stuff. The Trivial class here represents the empty assembly chain, the conveyor belt if you will, but it doesn’t care what kind of raw material gets in, what gets out or what each machine is doing. It is pure process. A real monad will need a couple of additional concepts. Let’s say the conveyor belt needs the material to be processed to be contained in standardized boxes, just so that it can safely and efficiently be transported from machine to machine or so that tracking information can be attached to it. Each machine knows how to treat raw material or partly processed material, but it doesn’t know how to treat the boxes so the conveyor belt will have to extract the material from the box before feeding it into each machine, and it will have to box it back afterwards. This conveyor belt with boxes is essentially what a monad is. It has one method to box stuff, one to extract stuff from its box and one to feed stuff into a machine. So let’s reformulate the previous example but this time with the boxes, which will do nothing for the moment except containing stuff. public class Identity<T> { public Identity(T value) { Value = value; } public T Value { get; private set;} public static Identity<T> Unit(T value) { return new Identity<T>(value); } public static Identity<U> Bind<U>( Identity<T> argument, Func<T, Identity<U>> operation) { return operation(argument.Value); } } Now this is a true to the definition Monad, including the weird naming of the methods. It is the simplest monad, called the identity monad and of course it does nothing useful. Here’s how you use it: Identity<string>.Bind( Identity<string>.Unit("some string"), s => Identity<string>.Unit( s + " was processed by identity monad.")).Value That of course is seriously ugly. Note that the operation is responsible for re-boxing its result. That is a part of strict monads that I don’t quite get and I’ll take the liberty to lift that strange constraint in the next examples. To make this more readable and easier to use, let’s build a few extension methods: public static class IdentityExtensions { public static Identity<T> ToIdentity<T>(this T value) { return new Identity<T>(value); } public static Identity<U> Bind<T, U>( this Identity<T> argument, Func<T, U> operation) { return operation(argument.Value).ToIdentity(); } } With those, we can rewrite our code as follows: "some string".ToIdentity() .Bind(s => s + " was processed by monad extensions.") .Bind(s => s + " And it's chainable...") .Value; This is considerably simpler but still retains the qualities of a monad. But it is still pointless. Let’s look at a more useful example, the state monad, which is basically a monad where the boxes have a label. It’s useful to perform operations on arbitrary objects that have been enriched with an attached state object. public class Stateful<TValue, TState> { public Stateful(TValue value, TState state) { Value = value; State = state; } public TValue Value { get; private set; } public TState State { get; set; } } public static class StateExtensions { public static Stateful<TValue, TState> ToStateful<TValue, TState>( this TValue value, TState state) { return new Stateful<TValue, TState>(value, state); } public static Stateful<TResult, TState> Execute<TValue, TState, TResult>( this Stateful<TValue, TState> argument, Func<TValue, TResult> operation) { return operation(argument.Value) .ToStateful(argument.State); } } You can get a stateful version of any object by calling the ToStateful extension method, passing the state object in. You can then execute ordinary operations on the values while retaining the state: var statefulInt = 3.ToStateful("This is the state"); var processedStatefulInt = statefulInt .Execute(i => ++i) .Execute(i => i * 10) .Execute(i => i + 2); Console.WriteLine("Value: {0}; state: {1}", processedStatefulInt.Value, processedStatefulInt.State); This monad differs from the identity by enriching the boxes. There is another way to give value to the monad, which is to enrich the processing. An example of that is the writer monad, which can be typically used to log the operations that are being performed by the monad. Of course, the richest monads enrich both the boxes and the processing. That’s all for today. I hope with this you won’t have to go through the same process that I did to understand monads and that you haven’t gone into concept overload like I did. Next time, we’ll examine some examples that you already know but we will shine the monadic light, hopefully illuminating them in a whole new way. Realizing that this pattern is actually in many places but mostly unnoticed is what will enable the truly casual “oh, yes, that’s a monad” comments. Here’s the code for this article: http://weblogs.asp.net/blogs/bleroy/Samples/Monads.zip The Wikipedia article on monads: http://en.wikipedia.org/wiki/Monads_in_functional_programming This article was invaluable for me in understanding how to express the canonical monads in C# (interesting Linq stuff in there): http://blogs.msdn.com/b/wesdyer/archive/2008/01/11/the-marvels-of-monads.aspxRead the article
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Welcome to the Oracle EMEA Partner Community for Exadata!
- by javier.puerta(at)oracle.com
The EMEA Partner Community for Exadata is the place where partners in Europe, Middle East and Africa can share experiences and best practices about selling and implementing Exadata projects. You will also receive first-hand information from Oracle on products, training and tools that can help you better market, sell and implement your Exadata-based projects and services Who should join the Community? Community membership is for individuals. If you are working for a company that is an Oracle partner and your job is selling, implementing or supporting Exadata projects in EMEA then this community is for you. How is this different from the Oracle Exadata Knowledge Zone? The Oracle Exadata Knowledge Zone is the fundamental source of information from Oracle for partners interested in specializing on Exadata. It is higly recommended that you get access to the Knowledge Zones related to the product areas of your interest. To get access to any of the Knowledge Zones an application must be completed by the Partner Program Administrator for your company. The Exadata Partner Community complements the Knowledge Zone by providing partners with information which is specific for the EMEA market (market, references, training, events,..) and it is also a mechanism to share experiences and best practices among partners in marketing, selling, implementing and supporting Exadata projects. How to join? For you to be able to register as an individual, your company must be member of the Oracle PartnerNetwork (OPN) and should be working towards becoming OPN Specialized in Exadata. If this is the case then Join the EMEA Exadata Partner Community Now! If your company is not an OPN member yet, then Join Oracle PartnerNetwork first. How do you get access to the information for the community members? We use two mechanisms to provide and share information: The EMEA Exadata Partner Community blog. This is a public blog and we use it to provide quick and easy communication to the community members. For detailed or restricted material we will point you to a restricted area. The EMEA Exadata Partner Community Collaborative Workspace. This is an area with restricted access that only community members can access. It contains materials from community events, sales kits, implementation experiences,... reserved to community members. It also allows for partners to share content and collaborate with other community members. You will get access to this restricted area when you register as a member of the EMEA Exadata Partner Community Need help? I hope that you will find useful the resources and the experience exchange provided by the community. If you need help or any further clarification, don't hesitate to contact me! Javier Puerta ([email protected])Director Core Technology Partner ProgramsAlliances & Channels EMEAPhone: +34916312141 Mobile: +34609062373Read the article
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Salt and hash a password in .NET
- by Jon Canning
I endeavoured to follow the CrackStation rules: Salted Password Hashing - Doing it Right public class SaltedHash { public string Hash { get; private set; } public string Salt { get; private set; } public SaltedHash(string password) { var saltBytes = new byte[32]; new RNGCryptoServiceProvider().GetNonZeroBytes(saltBytes); Salt = ConvertToBase64String(saltBytes); var passwordAndSaltBytes = Concat(password, saltBytes); Hash = ComputeHash(passwordAndSaltBytes); } static string ConvertToBase64String(byte[] bytes) { return Convert.ToBase64String(bytes); } static string ComputeHash(byte[] bytes) { return ConvertToBase64String(SHA256.Create().ComputeHash(bytes)); } static byte[] Concat(string password, byte[] saltBytes) { var passwordBytes = Encoding.UTF8.GetBytes(password); return passwordBytes.Concat(saltBytes).ToArray(); } public static bool Verify(string salt, string hash, string password) { var saltBytes = Convert.FromBase64String(salt); var passwordAndSaltBytes = Concat(password, saltBytes); var hashAttempt = ComputeHash(passwordAndSaltBytes); return hash == hashAttempt; } }Read the article
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Code refactoring with Visual Studio 2010 Part-1
- by Jalpesh P. Vadgama
Visual studio 2010 is a Great IDE(Integrated Development Environment) and we all are using it in day by day for our coding purpose. There are many great features provided by Visual Studio 2010 and Today I am going to show one of great feature called for code refactoring. This feature is one of the most unappreciated features of Visual Studio 2010 as lots of people still not using that and doing stuff manfully. So to explain feature let’s create a simple console application which will print first name and last name like following. And following is code for that. using System; namespace CodeRefractoring { class Program { static void Main(string[] args) { string firstName = "Jalpesh"; string lastName = "Vadgama"; Console.WriteLine(string.Format("FirstName:{0}",firstName)); Console.WriteLine(string.Format("LastName:{0}", lastName)); Console.ReadLine(); } } } So as you can see this is a very basic console application and let’s run it to see output. So now lets explore our first feature called extract method in visual studio you can also do that via refractor menu like following. Just select the code for which you want to extract method and then click refractor menu and then click extract method. Now I am selecting three lines of code and clicking on refactor –> Extract Method just like following. Once you click menu a dialog box will appear like following. As you can I have highlighted two thing first is Method Name where I put Print as Method Name and another one Preview method signature where its smart enough to extract parameter also as We have just selected three lines with console.writeline. One you click ok it will extract the method and you code will be like this. using System; namespace CodeRefractoring { class Program { static void Main(string[] args) { string firstName = "Jalpesh"; string lastName = "Vadgama"; Print(firstName, lastName); } private static void Print(string firstName, string lastName) { Console.WriteLine(string.Format("FirstName:{0}", firstName)); Console.WriteLine(string.Format("LastName:{0}", lastName)); Console.ReadLine(); } } } So as you can see in above code its has created a static method called Print and also passed parameter for as firstname and lastname. Isn’t that great!!!. It has also created static print method as I am calling it from static void main. Hope you liked it.. Stay tuned for more..Till that Happy programming.Read the article
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TFS 2010 SDK: Integrating Twitter with TFS Programmatically
- by Tarun Arora
Technorati Tags: Team Foundation Server 2010,TFS API,Integrate Twitter TFS,TFS Programming,ALM,TwitterSharp Friends at ‘Twitter Sharp’ have created a wonderful .net API for twitter. With this blog post i will try to show you a basic TFS – Twitter integration scenario where i will retrieve the Team Project details programmatically and then publish these details on my twitter page. In future blogs i will be demonstrating how to create a windows service to capture the events raised by TFS and then publishing them in your social eco-system. Download Working Demo: Integrate Twitter - Tfs Programmatically 1. Setting up Twitter API Download Tweet Sharp from => https://github.com/danielcrenna/tweetsharp Before you can start playing around with this, you will need to register an application on twitter. This is because Twitter uses the OAuth authentication protocol and will not issue an Access token unless your application is registered with them. Go to https://dev.twitter.com/ and register your application Once you have registered your application, you will need ‘Customer Key’, ‘Customer Secret’, ‘Access Token’, ‘Access Token Secret’ 2. Connecting to Twitter using the Tweet Sharp API Create a new C# windows forms project and add reference to ‘Hammock.ClientProfile’, ‘Newtonsoft.Json’, ‘TweetSharp’ Add the following keys to the App.config (Note – The values for the keys below are in correct and if you try and connect using them then you will get an authorization failure error). Add a new class ‘TwitterProxy’ and use the following code to connect to the TwitterService (Read more about OAuthentication - http://dev.twitter.com/pages/auth) using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Configuration;using TweetSharp; namespace WindowsFormsApplication2{ public class TwitterProxy { private static string _hero; private static string _consumerKey; private static string _consumerSecret; private static string _accessToken; private static string _accessTokenSecret; public static TwitterService ConnectToTwitter() { _consumerKey = ConfigurationManager.AppSettings["ConsumerKey"]; _consumerSecret = ConfigurationManager.AppSettings["ConsumerSecret"]; _accessToken = ConfigurationManager.AppSettings["AccessToken"]; _accessTokenSecret = ConfigurationManager.AppSettings["AccessTokenSecret"]; return new TwitterService(_consumerKey, _consumerSecret, _accessToken, _accessTokenSecret); } }} Time to Tweet! _twitterService = Proxy.TwitterProxy.ConnectToTwitter(); _twitterService.SendTweet("Hello World"); SendTweet will return the TweetStatus, If you do not get a 200 OK status that means you have failed authentication, please revisit the Access tokens. --RESPONSE: https://api.twitter.com/1/statuses/update.json HTTP/1.1 200 OK X-Transaction: 1308476106-69292-41752 X-Frame-Options: SAMEORIGIN X-Runtime: 0.03040 X-Transaction-Mask: a6183ffa5f44ef11425211f25 Pragma: no-cache X-Access-Level: read-write X-Revision: DEV X-MID: bd8aa0abeccb6efba38bc0a391a73fab98e983ea Cache-Control: no-cache, no-store, must-revalidate, pre-check=0, post-check=0 Content-Type: application/json; charset=utf-8 Date: Sun, 19 Jun 2011 09:35:06 GMT Expires: Tue, 31 Mar 1981 05:00:00 GMT Last-Modified: Sun, 19 Jun 2011 09:35:06 GMT Server: hi Vary: Accept-Encoding Content-Encoding: Keep-Alive: timeout=15, max=100 Connection: Keep-Alive Transfer-Encoding: chunked 3. Integrate with TFS In my blog post Connect to TFS Programmatically i have in depth demonstrated how to connect to TFS using the TFS API. 1: // Update the AppConfig with the URI of the Team Foundation Server you want to connect to, Make sure you have View Team Project Collection Details permissions on the server 2: private static string _myUri = ConfigurationManager.AppSettings["TfsUri"]; 3: private static TwitterService _twitterService = null; 4: 5: private void button1_Click(object sender, EventArgs e) 6: { 7: lblNotes.Text = string.Empty; 8: 9: try 10: { 11: StringBuilder notes = new StringBuilder(); 12: 13: _twitterService = Proxy.TwitterProxy.ConnectToTwitter(); 14: 15: _twitterService.SendTweet("Hello World"); 16: 17: TfsConfigurationServer configurationServer = 18: TfsConfigurationServerFactory.GetConfigurationServer(new Uri(_myUri)); 19: 20: CatalogNode catalogNode = configurationServer.CatalogNode; 21: 22: ReadOnlyCollection<CatalogNode> tpcNodes = catalogNode.QueryChildren( 23: new Guid[] { CatalogResourceTypes.ProjectCollection }, 24: false, CatalogQueryOptions.None); 25: 26: // tpc = Team Project Collection 27: foreach (CatalogNode tpcNode in tpcNodes) 28: { 29: Guid tpcId = new Guid(tpcNode.Resource.Properties["InstanceId"]); 30: TfsTeamProjectCollection tpc = configurationServer.GetTeamProjectCollection(tpcId); 31: 32: notes.AppendFormat("{0} Team Project Collection : {1}{0}", Environment.NewLine, tpc.Name); 33: _twitterService.SendTweet(String.Format("http://Lunartech.codeplex.com - Connecting to Team Project Collection : {0} ", tpc.Name)); 34: 35: // Get catalog of tp = 'Team Projects' for the tpc = 'Team Project Collection' 36: var tpNodes = tpcNode.QueryChildren( 37: new Guid[] { CatalogResourceTypes.TeamProject }, 38: false, CatalogQueryOptions.None); 39: 40: foreach (var p in tpNodes) 41: { 42: notes.AppendFormat("{0} Team Project : {1} - {2}{0}", Environment.NewLine, p.Resource.DisplayName, "This is an open source project hosted on codeplex"); 43: _twitterService.SendTweet(String.Format(" Connected to Team Project: '{0}' – '{1}' ", p.Resource.DisplayName, "This is an open source project hosted on codeplex")); 44: } 45: } 46: notes.AppendFormat("{0} Updates posted on Twitter : {1} {0}", Environment.NewLine, @"http://twitter.com/lunartech1"); 47: lblNotes.Text = notes.ToString(); 48: } 49: catch (Exception ex) 50: { 51: lblError.Text = " Message : " + ex.Message + (ex.InnerException != null ? " Inner Exception : " + ex.InnerException : string.Empty); 52: } 53: } The extensions you can build integrating TFS and Twitter are incredible! Share this post :Read the article
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How to Create and Manage Contact Groups in Outlook 2010
- by Mysticgeek
If you find you’re sending emails to the same people all the time during the day, it’s tedious entering in their addresses individually. Today we take a look at creating Contact Groups to make the process a lot easier. Create Contact Groups Open Outlook and click on New Items \ More Items \ Contact Group. This opens the Contract Group window. Give your group a name, click on Add Members, and select the people you want to add from your Outlook Contacts, Address Book, or Create new ones. If you select from your address book you can scroll through and add the contacts you want. If you have a large amount of contacts you might want to search for them or use Advanced Find. If you want to add a new email contact to your group, you’ll just need to enter in their display name and email address then click OK. If you want the new member added to your Contacts list then make sure Add to Contacts is checked. After you have the contacts you want in the group, click Save & Close. Now when you compose a message you should be able to type in the name of the Contact Group you created… If you want to make sure you have everyone included in the group, click on the plus icon to expand the contacts. You will get a dialog box telling you the members of the group will be shown and you cannot collapse it again. Check the box not to see the message again then click OK. Then the members of the group will appear in the To field. Of course you can enter a Contact Group into the CC or Bcc fields as well. Add or Remove Members to a Contact Group After expanding the group you might notice some contacts aren’t included, or there is an old contact you don’t want to be in the group anymore. Click on the To button… Right-click on the Contact Group and select Properties. Now you can go ahead and Add Members… Or highlight a member and remove them…when finished click Save & Close. If you need to send emails to several of the same people, creating Contact Groups is a great way to save time by not entering them individually. If you work in for a large company, creating Contact Groups by department is a must! Similar Articles Productive Geek Tips Schedule Auto Send & Receive in Microsoft OutlookCreate An Electronic Business Card In Outlook 2007Create an Email Template in Outlook 2003Clear the Auto-Complete Email Address Cache in OutlookGet Maps and Directions to Your Contacts in Outlook 2007 TouchFreeze Alternative in AutoHotkey The Icy Undertow Desktop Windows Home Server – Backup to LAN The Clear & Clean Desktop Use This Bookmarklet to Easily Get Albums Use AutoHotkey to Assign a Hotkey to a Specific Window Latest Software Reviews Tinyhacker Random Tips Xobni Plus for Outlook All My Movies 5.9 CloudBerry Online Backup 1.5 for Windows Home Server Snagit 10 2010 World Cup Schedule Boot Snooze – Reboot and then Standby or Hibernate Customize Everything Related to Dates, Times, Currency and Measurement in Windows 7 Google Earth replacement Icon (Icons we like) Build Great Charts in Excel with Chart Advisor tinysong gives a shortened URL for you to post on Twitter (or anywhere)Read the article
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libgdx rotation (animation, arrays) issues and help needed
- by johnny-b
well i am a noob at java and libgdx. i got the homing bullet working with the help of someone. now i am smashing my head as to how i can make it rotate so it faces the ball (which is the main character) when it goes around it or when it is coming towards it. the bullet is facing <--- and the code below is what i have done so far. also i used sprites for the bullet and also animation method. Also how do i make it an array/arraylist which is best so i can have multiple bullets at random or placed places. i tried many things nothing workd :( thank you for the help. // below is the bullet or enemy if you want to call it. public class Bullet extends Sprite { public static final float BULLET_HOMING = 6000; public static final float BULLET_SPEED = 300; private Vector2 velocity; private float lifetime; public Bullet(float x, float y) { velocity = new Vector2(0, 0); setPosition(x, y); } public void update(float delta) { float targetX = GameWorld.getBall().getX(); float targetY = GameWorld.getBall().getY(); float dx = targetX - getX(); float dy = targetY - getY(); float distToTarget = (float) Math.sqrt(dx * dx + dy * dy); dx /= distToTarget; dy /= distToTarget; dx *= BULLET_HOMING; dy *= BULLET_HOMING; velocity.x += dx * delta; velocity.y += dy * delta; float vMag = (float) Math.sqrt(velocity.x * velocity.x + velocity.y * velocity.y); velocity.x /= vMag; velocity.y /= vMag; velocity.x *= BULLET_SPEED; velocity.y *= BULLET_SPEED; Vector2 v = velocity.cpy().scl(delta); setPosition(getX() + v.x, getY() + v.y); setOriginCenter(); setRotation(velocity.angle()); lifetime += delta; setRegion(AssetLoader.bulletAnimation.getKeyFrame(lifetime)); } } // this is where i load the images. public class AssetLoader { public static Animation bulletAnimation; public static Sprite bullet1, bullet2; public static void load() { texture = new Texture(Gdx.files.internal("SpriteN1.png")); texture.setFilter(TextureFilter.Nearest, TextureFilter.Nearest); bullet1 = new Sprite(texture, 380, 350, 45, 20); bullet1.flip(false, true); bullet2 = new Sprite(texture, 425, 350, 45, 20); bullet2.flip(false, true); Sprite[] bullets = { bullet1, bullet2 }; bulletAnimation = new Animation(0.06f, aims); bulletAnimation.setPlayMode(Animation.PlayMode.LOOP); } public static void dispose() { // We must dispose of the texture when we are finished. texture.dispose(); } // this is for the rendering of the images etc public class GameRenderer { private Bullet bullet; private Ball ball; public GameRenderer(GameWorld world) { myWorld = world; cam = new OrthographicCamera(); cam.setToOrtho(true, 480, 320); batcher = new SpriteBatch(); // Attach batcher to camera batcher.setProjectionMatrix(cam.combined); shapeRenderer = new ShapeRenderer(); shapeRenderer.setProjectionMatrix(cam.combined); // Call helper methods to initialize instance variables initGameObjects(); initAssets(); } private void initGameObjects() { ball = GameWorld.getBall(); bullet = myWorld.getBullet(); scroller = myWorld.getScroller(); } private void initAssets() { ballAnimation = AssetLoader.ballAnimation; bulletAnimation = AssetLoader.bulletAnimation; } public void render(float runTime) { Gdx.gl.glClearColor(0, 0, 0, 1); Gdx.gl.glClear(GL30.GL_COLOR_BUFFER_BIT); batcher.begin(); // Disable transparency // This is good for performance when drawing images that do not require // transparency. batcher.disableBlending(); // The ball needs transparency, so we enable that again. batcher.enableBlending(); batcher.draw(AssetLoader.ballAnimation.getKeyFrame(runTime), ball.getX(), ball.getY(), ball.getWidth(), ball.getHeight()); batcher.draw(AssetLoader.bulletAnimation.getKeyFrame(runTime), bullet.getX(), bullet.getY()); // End SpriteBatch batcher.end(); } } // this is to load the image etc on the screen i guess public class GameWorld { public static Ball ball; private Bullet bullet; private ScrollHandler scroller; public GameWorld() { ball = new Ball(480, 273, 32, 32); bullet = new Bullet(10, 10); scroller = new ScrollHandler(0); } public void update(float delta) { ball.update(delta); bullet.update(delta); scroller.update(delta); } public static Ball getBall() { return ball; } public ScrollHandler getScroller() { return scroller; } public Bullet getBullet() { return bullet; } } so there is the whole thing. the images are loaded via the AssetLoader then to the GameRenderer and GameWorld via the Bullet class. i am guessing that is how it is. sorry newbie so still learning. thank you in advace for the help or any advice.Read the article
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Using Delegates in C# (Part 1)
- by rajbk
This post provides a very basic introduction of delegates in C#. Part 2 of this post can be read here. A delegate is a class that is derived from System.Delegate. It contains a list of one or more methods called an invocation list. When a delegate instance is “invoked” with the arguments as defined in the signature of the delegate, each of the methods in the invocation list gets invoked with the arguments. The code below shows example with static and instance methods respectively: Static Methods 1: using System; 2: using System.Linq; 3: using System.Collections.Generic; 4: 5: public delegate void SayName(string name); 6: 7: public class Program 8: { 9: [STAThread] 10: static void Main(string[] args) 11: { 12: SayName englishDelegate = new SayName(SayNameInEnglish); 13: SayName frenchDelegate = new SayName(SayNameInFrench); 14: SayName combinedDelegate =(SayName)Delegate.Combine(englishDelegate, frenchDelegate); 15: 16: combinedDelegate.Invoke("Tom"); 17: Console.ReadLine(); 18: } 19: 20: static void SayNameInFrench(string name) { 21: Console.WriteLine("J'ai m'appelle " + name); 22: } 23: 24: static void SayNameInEnglish(string name) { 25: Console.WriteLine("My name is " + name); 26: } 27: } We have declared a delegate of type SayName with return type of void and taking an input parameter of name of type string. On line 12, we create a new instance of this delegate which refers to a static method - SayNameInEnglish. SayNameInEnglish has the same return type and parameter list as the delegate declaration. Once a delegate is instantiated, the instance will always refer to the same target. Delegates are immutable. On line 13, we create a new instance of the delegate but point to a different static method. As you may recall, a delegate instance encapsulates an invocation list. You create an invocation list by combining delegates using the Delegate.Combine method (there is an easier syntax as you will see later). When two non null delegate instances are combined, their invocation lists get combined to form a new invocation list. This is done in line 14. On line 16, we invoke the delegate with the Invoke method and pass in the required string parameter. Since the delegate has an invocation list with two entries, each of the method in the invocation list is invoked. If an unhandled exception occurs during the invocation of one of these methods, the exception gets bubbled up to the line where the invocation was made (line 16). If a delegate is null and you try to invoke it, you will get a System.NullReferenceException. We see the following output when the method is run: My name is TomJ'ai m'apelle Tom Instance Methods The code below outputs the same results as before. The only difference here is we are creating delegates that point to a target object (an instance of Translator) and instance methods which have the same signature as the delegate type. The target object can never be null. We also use the short cut syntax += to combine the delegates instead of Delegate.Combine. 1: public delegate void SayName(string name); 2: 3: public class Program 4: { 5: [STAThread] 6: static void Main(string[] args) 7: { 8: Translator translator = new Translator(); 9: SayName combinedDelegate = new SayName(translator.SayNameInEnglish); 10: combinedDelegate += new SayName(translator.SayNameInFrench); 11: 12: combinedDelegate.Invoke("Tom"); 13: Console.ReadLine(); 14: } 15: } 16: 17: public class Translator { 18: public void SayNameInFrench(string name) { 19: Console.WriteLine("J'ai m'appelle " + name); 20: } 21: 22: public void SayNameInEnglish(string name) { 23: Console.WriteLine("My name is " + name); 24: } 25: } A delegate can be removed from a combination of delegates by using the –= operator. Removing a delegate from an empty list or removing a delegate that does not exist in a non empty list will not result in an exception. Delegates are invoked synchronously using the Invoke method. We can also invoke them asynchronously using the BeginInvoke and EndInvoke methods which are compiler generated.Read the article
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Netinstalling CentOS if the gateway is in a different subnet
- by James Lawrie
I have a KVM host (A) running a virtual machine (B). They each have their own external IP address and the networking is setup using bridging between eth0 and br0 on A. B uses eth0, with A being the gateway. The problem is that the two external IP addresses are on different subnets (different /8s in fact) so by default, B claims it cannot reach A (Network Unreachable). I can resolve this by adding a static route on B: echo "any host gateway_ip dev eth0" > /etc/sysconfig/static-routes Modifying /etc/init.d/networking to reload the gateway after applying static routes (I only added the final line before fi): if [ -f /etc/sysconfig/static-routes ]; then grep "^any" /etc/sysconfig/static-routes | while read ignore args ; do /sbin/route add -$args done route add default gw "${GATEWAY}" fi If I then restart networking, it comes online. How can I do this (or work around it some other way) prior to the system being installed, ideally inside an Anaconda kickstart file?Read the article
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Default Parameters vs Method Overloading
- by João Angelo
With default parameters introduced in C# 4.0 one might be tempted to abandon the old approach of providing method overloads to simulate default parameters. However, you must take in consideration that both techniques are not interchangeable since they show different behaviors in certain scenarios. For me the most relevant difference is that default parameters are a compile time feature while method overloading is a runtime feature. To illustrate these concepts let’s take a look at a complete, although a bit long, example. What you need to retain from the example is that static method Foo uses method overloading while static method Bar uses C# 4.0 default parameters. static void CreateCallerAssembly(string name) { // Caller class - Invokes Example.Foo() and Example.Bar() string callerCode = String.Concat( "using System;", "public class Caller", "{", " public void Print()", " {", " Console.WriteLine(Example.Foo());", " Console.WriteLine(Example.Bar());", " }", "}"); var parameters = new CompilerParameters(new[] { "system.dll", "Common.dll" }, name); new CSharpCodeProvider().CompileAssemblyFromSource(parameters, callerCode); } static void Main() { // Example class - Foo uses overloading while Bar uses C# 4.0 default parameters string exampleCode = String.Concat( "using System;", "public class Example", "{{", " public static string Foo() {{ return Foo(\"{0}\"); }}", " public static string Foo(string key) {{ return \"FOO-\" + key; }}", " public static string Bar(string key = \"{0}\") {{ return \"BAR-\" + key; }}", "}}"); var compiler = new CSharpCodeProvider(); var parameters = new CompilerParameters(new[] { "system.dll" }, "Common.dll"); // Build Common.dll with default value of "V1" compiler.CompileAssemblyFromSource(parameters, String.Format(exampleCode, "V1")); // Caller1 built against Common.dll that uses a default of "V1" CreateCallerAssembly("Caller1.dll"); // Rebuild Common.dll with default value of "V2" compiler.CompileAssemblyFromSource(parameters, String.Format(exampleCode, "V2")); // Caller2 built against Common.dll that uses a default of "V2" CreateCallerAssembly("Caller2.dll"); dynamic caller1 = Assembly.LoadFrom("Caller1.dll").CreateInstance("Caller"); dynamic caller2 = Assembly.LoadFrom("Caller2.dll").CreateInstance("Caller"); Console.WriteLine("Caller1.dll:"); caller1.Print(); Console.WriteLine("Caller2.dll:"); caller2.Print(); } And if you run this code you will get the following output: // Caller1.dll: // FOO-V2 // BAR-V1 // Caller2.dll: // FOO-V2 // BAR-V2 You see that even though Caller1.dll runs against the current Common.dll assembly where method Bar defines a default value of “V2″ the output show us the default value defined at the time Caller1.dll compiled against the first version of Common.dll. This happens because the compiler will copy the current default value to each method call, much in the same way a constant value (const keyword) is copied to a calling assembly and changes to it’s value will only be reflected if you rebuild the calling assembly again. The use of default parameters is also discouraged by Microsoft in public API’s as stated in (CA1026: Default parameters should not be used) code analysis rule.Read the article
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Teamed network cards on a Proliant Server
- by Matt
We have 4 network cards in a Proliant server with Server 2008R2 running Exchange 2010, with 1 card set to a static IP address and the other 3 set to DHCP. I just need some clarification as I have not teamed network cards. Do all the network cards need to have a static IP when I set as a team. The connection that has the static IP is the IP that I need to use for the Server. Is it possible to set the teamed cards to the same static IP or do I have to change the static IP to another IP then use it for the teamed IP? I will be using HP Network Configuration Utility to set this up.Read the article
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Serving images from different domain
- by Tom Gullen
Google audit: Serve static content from a cookieless domain (15) 2.65KB of cookies were sent with the following static resources. Serve these static resources from a domain that does not set cookies: If my domain is widgets.com, should I set up a img.widgets.com that servers these resources? How beneficial is this? Edit I setup img.widgets.com to serve images from, and changed all images to this URL. But I still get that message?Read the article
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Building on someone else's DefaultButton Silverlight work...
- by KyleBurns
This week I was handed a "simple" requirement - have a search screen execute its search when the user pressed the Enter key instead of having to move hands from keyboard to mouse and click Search. That is a reasonable request that has been met for years both in Windows and Web apps. I did a quick scan for code to pilfer and found Patrick Cauldwell's Blog posting "A 'Default Button' In Silverlight". This posting was a great start and I'm glad that the basic work had been done for me, but I ran into one issue - when using bound textboxes (I'm a die-hard MVVM enthusiast when it comes to Silverlight development), the search was being executed before the textbox I was in when the Enter key was pressed updated its bindings. With a little bit of reflection work, I think I have found a good generic solution that builds upon Patrick's to make it more binding-friendly. Also, I wanted to set the DefaultButton at a higher level than on each TextBox (or other control for that matter), so the use of mine is intended to be set somewhere such as the LayoutRoot or other high level control and will apply to all controls beneath it in the control tree. I haven't tested this on controls that treat the Enter key special themselves in the mix. The real change from Patrick's solution here is that in the KeyUp event, I grab the source of the KeyUp event (in my case the textbox containing search criteria) and loop through the static fields on the element's type looking for DependencyProperty instances. When I find a DependencyProperty, I grab the value and query for bindings. Each time I find a binding, UpdateSource is called to make sure anything bound to any property of the field has the opportunity to update before the action represented by the DefaultButton is executed. Here's the code: public class DefaultButtonService { public static DependencyProperty DefaultButtonProperty = DependencyProperty.RegisterAttached("DefaultButton", typeof (Button), typeof (DefaultButtonService), new PropertyMetadata (null, DefaultButtonChanged)); private static void DefaultButtonChanged(DependencyObject d, DependencyPropertyChangedEventArgs e) { var uiElement = d as UIElement; var button = e.NewValue as Button; if (uiElement != null && button != null) { uiElement.KeyUp += (sender, arg) => { if (arg.Key == Key.Enter) { var element = arg.OriginalSource as FrameworkElement; if (element != null) { UpdateBindings(element); } if (button.IsEnabled) { button.Focus(); var peer = new ButtonAutomationPeer(button); var invokeProv = peer.GetPattern(PatternInterface.Invoke) as IInvokeProvider; if (invokeProv != null) invokeProv.Invoke(); arg.Handled = true; } } }; } } public static DefaultButtonService GetDefaultButton(UIElement obj) { return (DefaultButtonService) obj.GetValue(DefaultButtonProperty); } public static void SetDefaultButton(DependencyObject obj, DefaultButtonService button) { obj.SetValue(DefaultButtonProperty, button); } public static void UpdateBindings(FrameworkElement element) { element.GetType().GetFields(BindingFlags.Public | BindingFlags.Static).ForEach(field => { if (field.FieldType.IsAssignableFrom(typeof(DependencyProperty))) { try { var dp = field.GetValue(null) as DependencyProperty; if (dp != null) { var binding = element.GetBindingExpression(dp); if (binding != null) { binding.UpdateSource(); } } } // ReSharper disable EmptyGeneralCatchClause catch (Exception) // ReSharper restore EmptyGeneralCatchClause { // swallow exceptions } } }); } }Read the article
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Installing PHP-GTK with PHP 5.3 on OS X
- by Shabbyrobe
I'm having trouble getting php-gtk installed with php 5.3 on os x. I'm currently using macports to do it and when I try to install php-gtk, it spews 'duplicate static' errors: Error: Target org.macports.build returned: shell command " cd "/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_ports_php_php5-gtk/work/php-gtk-2.0.1" && /usr/bin/make -j2 all " returned error 2 Command output: ext/gtk+/gen_pango.c:2951: error: duplicate 'static' ext/gtk+/gen_pango.c:2957: error: duplicate 'static' ext/gtk+/gen_pango.c:3097: error: duplicate 'static' ext/gtk+/gen_pango.c:3103: error: duplicate 'static' Is there a way to coerce it into building, or an alternative way to install it?Read the article
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Remove box2d bodies after collision deduction android?
- by jubin
Can any one explain me how to destroy box2d body when collide i have tried but my application crashed.First i have checked al collisions then add all the bodies in array who i want to destroy.I am trying to learning this tutorial My all the bodies are falling i want these bodies should destroy when these bodies will collide my actor monkey but when it collide it destroy but my aplication crashed.I have googled and from google i got the application crash reasons we should not destroy body in step funtion but i am removing body in the last of tick method. could any one help me or provide me code aur check my code why i am getting this prblem or how can i destroy box2d bodies. This is my code what i am doing. Please could any one check my code and tell me what is i am doing wrong for removing bodies. The code is for multiple box2d objects falling on my actor monkey it should be destroy when it will fall on the monkey.It is destroing but my application crahes. static class Box2DLayer extends CCLayer { protected static final float PTM_RATIO = 32.0f; protected static final float WALK_FACTOR = 3.0f; protected static final float MAX_WALK_IMPULSE = 0.2f; protected static final float ANIM_SPEED = 0.3f; int isLeft=0; String dir=""; int x =0; float direction; CCColorLayer objectHint; // protected static final float PTM_RATIO = 32.0f; protected World _world; protected static Body spriteBody; CGSize winSize = CCDirector.sharedDirector().winSize(); private static int count = 200; protected static Body monkey_body; private static Body bodies; CCSprite monkey; float animDelay; int animPhase; CCSpriteSheet danceSheet = CCSpriteSheet.spriteSheet("phases.png"); CCSprite _block; List<Body> toDestroy = new ArrayList<Body>(); //CCSpriteSheet _spriteSheet; private static MyContactListener _contactListener = new MyContactListener(); public Box2DLayer() { this.setIsAccelerometerEnabled(true); CCSprite bg = CCSprite.sprite("jungle.png"); addChild(bg,0); bg.setAnchorPoint(0,0); bg.setPosition(0,0); CGSize s = CCDirector.sharedDirector().winSize(); // Use scaled width and height so that our boundaries always match the current screen float scaledWidth = s.width/PTM_RATIO; float scaledHeight = s.height/PTM_RATIO; Vector2 gravity = new Vector2(0.0f, -30.0f); boolean doSleep = false; _world = new World(gravity, doSleep); // Create edges around the entire screen // Define the ground body. BodyDef bxGroundBodyDef = new BodyDef(); bxGroundBodyDef.position.set(0.0f, 0.0f); // The body is also added to the world. Body groundBody = _world.createBody(bxGroundBodyDef); // Register our contact listener // Define the ground box shape. PolygonShape groundBox = new PolygonShape(); Vector2 bottomLeft = new Vector2(0f,0f); Vector2 topLeft = new Vector2(0f,scaledHeight); Vector2 topRight = new Vector2(scaledWidth,scaledHeight); Vector2 bottomRight = new Vector2(scaledWidth,0f); // bottom groundBox.setAsEdge(bottomLeft, bottomRight); groundBody.createFixture(groundBox,0); // top groundBox.setAsEdge(topLeft, topRight); groundBody.createFixture(groundBox,0); // left groundBox.setAsEdge(topLeft, bottomLeft); groundBody.createFixture(groundBox,0); // right groundBox.setAsEdge(topRight, bottomRight); groundBody.createFixture(groundBox,0); CCSprite floorbg = CCSprite.sprite("grassbehind.png"); addChild(floorbg,1); floorbg.setAnchorPoint(0,0); floorbg.setPosition(0,0); CCSprite floorfront = CCSprite.sprite("grassfront.png"); floorfront.setTag(2); this.addBoxBodyForSprite(floorfront); addChild(floorfront,3); floorfront.setAnchorPoint(0,0); floorfront.setPosition(0,0); addChild(danceSheet); //CCSprite monkey = CCSprite.sprite(danceSheet, CGRect.make(0, 0, 48, 73)); //addChild(danceSprite); monkey = CCSprite.sprite("arms_up.png"); monkey.setTag(2); monkey.setPosition(200,100); BodyDef spriteBodyDef = new BodyDef(); spriteBodyDef.type = BodyType.DynamicBody; spriteBodyDef.bullet=true; spriteBodyDef.position.set(200 / PTM_RATIO, 300 / PTM_RATIO); monkey_body = _world.createBody(spriteBodyDef); monkey_body.setUserData(monkey); PolygonShape spriteShape = new PolygonShape(); spriteShape.setAsBox(monkey.getContentSize().width/PTM_RATIO/2, monkey.getContentSize().height/PTM_RATIO/2); FixtureDef spriteShapeDef = new FixtureDef(); spriteShapeDef.shape = spriteShape; spriteShapeDef.density = 2.0f; spriteShapeDef.friction = 0.70f; spriteShapeDef.restitution = 0.0f; monkey_body.createFixture(spriteShapeDef); //Vector2 force = new Vector2(10, 10); //monkey_body.applyLinearImpulse(force, spriteBodyDef.position); addChild(monkey,10000); this.schedule(tickCallback); this.schedule(createobjects, 2.0f); objectHint = CCColorLayer.node(ccColor4B.ccc4(255,0,0,128), 200f, 100f); addChild(objectHint, 15000); objectHint.setVisible(false); _world.setContactListener(_contactListener); } private UpdateCallback tickCallback = new UpdateCallback() { public void update(float d) { tick(d); } }; private UpdateCallback createobjects = new UpdateCallback() { public void update(float d) { secondUpdate(d); } }; private void secondUpdate(float dt) { this.addNewSprite(); } public void addBoxBodyForSprite(CCSprite sprite) { BodyDef spriteBodyDef = new BodyDef(); spriteBodyDef.type = BodyType.StaticBody; //spriteBodyDef.bullet=true; spriteBodyDef.position.set(sprite.getPosition().x / PTM_RATIO, sprite.getPosition().y / PTM_RATIO); spriteBody = _world.createBody(spriteBodyDef); spriteBody.setUserData(sprite); Vector2 verts[] = { new Vector2(-11.8f / PTM_RATIO, -24.5f / PTM_RATIO), new Vector2(11.7f / PTM_RATIO, -24.0f / PTM_RATIO), new Vector2(29.2f / PTM_RATIO, -14.0f / PTM_RATIO), new Vector2(28.7f / PTM_RATIO, -0.7f / PTM_RATIO), new Vector2(8.0f / PTM_RATIO, 18.2f / PTM_RATIO), new Vector2(-29.0f / PTM_RATIO, 18.7f / PTM_RATIO), new Vector2(-26.3f / PTM_RATIO, -12.2f / PTM_RATIO) }; PolygonShape spriteShape = new PolygonShape(); spriteShape.set(verts); //spriteShape.setAsBox(sprite.getContentSize().width/PTM_RATIO/2, //sprite.getContentSize().height/PTM_RATIO/2); FixtureDef spriteShapeDef = new FixtureDef(); spriteShapeDef.shape = spriteShape; spriteShapeDef.density = 2.0f; spriteShapeDef.friction = 0.70f; spriteShapeDef.restitution = 0.0f; spriteShapeDef.isSensor=true; spriteBody.createFixture(spriteShapeDef); } public void addNewSprite() { count=0; Random rand = new Random(); int Number = rand.nextInt(10); switch(Number) { case 0: _block = CCSprite.sprite("banana.png"); break; case 1: _block = CCSprite.sprite("backpack.png");break; case 2: _block = CCSprite.sprite("statue.png");break; case 3: _block = CCSprite.sprite("pineapple.png");break; case 4: _block = CCSprite.sprite("bananabunch.png");break; case 5: _block = CCSprite.sprite("hat.png");break; case 6: _block = CCSprite.sprite("canteen.png");break; case 7: _block = CCSprite.sprite("banana.png");break; case 8: _block = CCSprite.sprite("statue.png");break; case 9: _block = CCSprite.sprite("hat.png");break; } int padding=20; //_block.setPosition(CGPoint.make(100, 100)); // Determine where to spawn the target along the Y axis CGSize winSize = CCDirector.sharedDirector().displaySize(); int minY = (int)(_block.getContentSize().width / 2.0f); int maxY = (int)(winSize.width - _block.getContentSize().width / 2.0f); int rangeY = maxY - minY; int actualY = rand.nextInt(rangeY) + minY; // Create block and add it to the layer float xOffset = padding+_block.getContentSize().width/2+((_block.getContentSize().width+padding)*count); _block.setPosition(CGPoint.make(actualY, 750)); _block.setTag(1); float w = _block.getContentSize().width; objectHint.setVisible(true); objectHint.changeWidth(w); objectHint.setPosition(actualY-w/2, 460); this.addChild(_block,10000); // Create ball body and shape BodyDef ballBodyDef1 = new BodyDef(); ballBodyDef1.type = BodyType.DynamicBody; ballBodyDef1.position.set(actualY/PTM_RATIO, 480/PTM_RATIO); bodies = _world.createBody(ballBodyDef1); bodies.setUserData(_block); PolygonShape circle1 = new PolygonShape(); Vector2 verts[] = { new Vector2(-11.8f / PTM_RATIO, -24.5f / PTM_RATIO), new Vector2(11.7f / PTM_RATIO, -24.0f / PTM_RATIO), new Vector2(29.2f / PTM_RATIO, -14.0f / PTM_RATIO), new Vector2(28.7f / PTM_RATIO, -0.7f / PTM_RATIO), new Vector2(8.0f / PTM_RATIO, 18.2f / PTM_RATIO), new Vector2(-29.0f / PTM_RATIO, 18.7f / PTM_RATIO), new Vector2(-26.3f / PTM_RATIO, -12.2f / PTM_RATIO) }; circle1.set(verts); FixtureDef ballShapeDef1 = new FixtureDef(); ballShapeDef1.shape = circle1; ballShapeDef1.density = 10.0f; ballShapeDef1.friction = 0.0f; ballShapeDef1.restitution = 0.1f; bodies.createFixture(ballShapeDef1); count++; //Remove(); } @Override public void ccAccelerometerChanged(float accelX, float accelY, float accelZ) { //Apply the directional impulse /*float impulse = monkey_body.getMass()*accelY*WALK_FACTOR; Vector2 force = new Vector2(impulse, 0); monkey_body.applyLinearImpulse(force, monkey_body.getWorldCenter());*/ walk(accelY); //Remove(); } private void walk(float accelY) { // TODO Auto-generated method stub direction = accelY; } private void Remove() { for (Iterator<MyContact> it1 = _contactListener.mContacts.iterator(); it1.hasNext();) { MyContact contact = it1.next(); Body bodyA = contact.fixtureA.getBody(); Body bodyB = contact.fixtureB.getBody(); // See if there's any user data attached to the Box2D body // There should be, since we set it in addBoxBodyForSprite if (bodyA.getUserData() != null && bodyB.getUserData() != null) { CCSprite spriteA = (CCSprite) bodyA.getUserData(); CCSprite spriteB = (CCSprite) bodyB.getUserData(); // Is sprite A a cat and sprite B a car? If so, push the cat // on a list to be destroyed... if (spriteA.getTag() == 1 && spriteB.getTag() == 2) { //Log.v("dsfds", "dsfsd"+bodyA); //_world.destroyBody(bodyA); // removeChild(spriteA, true); toDestroy.add(bodyA); } // Is sprite A a car and sprite B a cat? If so, push the cat // on a list to be destroyed... else if (spriteA.getTag() == 2 && spriteB.getTag() == 1) { //Log.v("dsfds", "dsfsd"+bodyB); toDestroy.add(bodyB); } } } // Loop through all of the box2d bodies we want to destroy... for (Iterator<Body> it1 = toDestroy.iterator(); it1.hasNext();) { Body body = it1.next(); // See if there's any user data attached to the Box2D body // There should be, since we set it in addBoxBodyForSprite if (body.getUserData() != null) { // We know that the user data is a sprite since we set // it that way, so cast it... CCSprite sprite = (CCSprite) body.getUserData(); // Remove the sprite from the scene _world.destroyBody(body); removeChild(sprite, true); } // Destroy the Box2D body as well // _contactListener.mContacts.remove(0); } } public synchronized void tick(float delta) { synchronized (_world) { _world.step(delta, 8, 3); //_world.clearForces(); //addNewSprite(); } CCAnimation danceAnimation = CCAnimation.animation("dance", 1.0f); // Iterate over the bodies in the physics world Iterator<Body> it = _world.getBodies(); while(it.hasNext()) { Body b = it.next(); Object userData = b.getUserData(); if (userData != null && userData instanceof CCSprite) { //Synchronize the Sprites position and rotation with the corresponding body CCSprite sprite = (CCSprite)userData; if(sprite.getTag()==1) { //b.applyLinearImpulse(force, pos); sprite.setPosition(b.getPosition().x * PTM_RATIO, b.getPosition().y * PTM_RATIO); sprite.setRotation(-1.0f * ccMacros.CC_RADIANS_TO_DEGREES(b.getAngle())); } else { //Apply the directional impulse float impulse = monkey_body.getMass()*direction*WALK_FACTOR; Vector2 force = new Vector2(impulse, 0); b.applyLinearImpulse(force, b.getWorldCenter()); sprite.setPosition(b.getPosition().x * PTM_RATIO, b.getPosition().y * PTM_RATIO); animDelay -= 1.0f/60.0f; if(animDelay <= 0) { animDelay = ANIM_SPEED; animPhase++; if(animPhase > 2) { animPhase = 1; } } if(direction < 0 ) { isLeft=1; } else { isLeft=0; } if(isLeft==1) { dir = "left"; } else { dir = "right"; } float standingLimit = (float) 0.1f; float vX = monkey_body.getLinearVelocity().x; if((vX > -standingLimit)&& (vX < standingLimit)) { // Log.v("sasd", "standing"); } else { } } } } Remove(); } } Sorry for my english. Thanks in advance.Read the article
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Future Of F# At Jazoon 2011
- by Alois Kraus
I was at the Jazoon 2011 in Zurich (Switzerland). It was a really cool event and it had many top notch speaker not only from the Microsoft universe. One of the most interesting talks was from Don Syme with the title: F# Today/F# Tomorrow. He did show how to use F# scripting to browse through open databases/, OData Web Services, Sharepoint, …interactively. It looked really easy with the help of F# Type Providers which is the next big language feature in a future F# version. The object returned by a Type Provider is used to access the data like in usual strongly typed object model. No guessing how the property of an object is called. Intellisense will show it just as you expect. There exists a range of Type Providers for various data sources where the schema of the stored data can somehow be dynamically extracted. Lets use e.g. a free database it would be then let data = DbProvider(http://.....); data the object which contains all data from e.g. a chemical database. It has an elements collection which contains an element which has the properties: Name, AtomicMass, Picture, …. You can browse the object returned by the Type Provider with full Intellisense because the returned object is strongly typed which makes this happen. The same can be achieved of course with code generators that use an input the schema of the input data (OData Web Service, database, Sharepoint, JSON serialized data, …) and spit out the necessary strongly typed objects as an assembly. This does work but has the downside that if the schema of your data source is huge you will quickly run against a wall with traditional code generators since the generated “deserialization” assembly could easily become several hundred MB. *** The following part contains guessing how this exactly work by asking Don two questions **** Q: Can I use Type Providers within C#? D: No. Q: F# is after all a library. I can reference the F# assemblies and use the contained Type Providers? D: F# does annotate the generated types in a special way at runtime which is not a static type that C# could use. The F# type providers seem to use a hybrid approach. At compilation time the Type Provider is instantiated with the url of your input data. The obtained schema information is used by the compiler to generate static types as usual but only for a small subset (the top level classes up to certain nesting level would make sense to me). To make this work you need to access the actual data source at compile time which could be a problem if you want to keep the actual url in a config file. Ok so this explains why it does work at all. But in the demo we did see full intellisense support down to the deepest object level. It looks like if you navigate deeper into the object hierarchy the type provider is instantiated in the background and attach to a true static type the properties determined at run time while you were typing. So this type is not really static at all. It is static if you define as a static type that its properties shows up in intellisense. But since this type information is determined while you are typing and it is not used to generate a true static type and you cannot use these “intellistatic” types from C#. Nonetheless this is a very cool language feature. With the plotting libraries you can generate expressive charts from any datasource within seconds to get quickly an overview of any structured data storage. My favorite programming language C# will not get such features in the near future there is hope. If you restrict yourself to OData sources you can use LINQPad to query any OData enabled data source with LINQ with ease. There you can query Stackoverflow with The output is also nicely rendered which makes it a very good tool to explore OData sources today.Read the article
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C# vector class - Interpolation design decision
- by Benjamin
Currently I'm working on a vector class in C# and now I'm coming to the point, where I've to figure out, how i want to implement the functions for interpolation between two vectors. At first I came up with implementing the functions directly into the vector class... public class Vector3D { public static Vector3D LinearInterpolate(Vector3D vector1, Vector3D vector2, double factor) { ... } public Vector3D LinearInterpolate(Vector3D other, double factor { ... } } (I always offer both: a static method with two vectors as parameters and one non-static, with only one vector as parameter) ...but then I got the idea to use extension methods (defined in a seperate class called "Interpolation" for example), since interpolation isn't really a thing only available for vectors. So this could be another solution: public class Vector3D { ... } public static class Interpolation { public static Vector3D LinearInterpolate(this Vector3D vector, Vector3D other, double factor) { ... } } So here an example how you'd use the different possibilities: { var vec1 = new Vector3D(5, 3, 1); var vec2 = new Vector3D(4, 2, 0); Vector3D vec3; vec3 = vec1.LinearInterpolate(vec2, 0.5); //1 vec3 = Vector3D.LinearInterpolate(vec1, vec2, 0.5); //2 //or with extension-methods vec3 = vec1.LinearInterpolate(vec2, 0.5); //3 (same as 1) vec3 = Interpolation.LinearInterpolation(vec1, vec2, 0.5); //4 } So I really don't know which design is better. Also I don't know if there's an ultimate rule for things like this or if it's just about what someone personally prefers. But I really would like to hear your opinions, what's better (and if possible why ).Read the article
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install wireshark 1.8.3 in ubuntu 12.04
- by gene
To enable capture traffic on multiple interfaces at once, I tried to install wireshark 1.8.3. However, I encountered the following errors: capture-pcap-util.c:274:1: error: static declaration of ‘pcap_datalink_name_to_val’ follows non-static declaration /usr/local/include/pcap/pcap.h:326:5: note: previous declaration of ‘pcap_datalink_name_to_val’ was here capture-pcap-util.c:289:1: error: static declaration of ‘pcap_datalink_val_to_name’ follows non-static declaration /usr/local/include/pcap/pcap.h:327:13: note: previous declaration of ‘pcap_datalink_val_to_name’ was here After doing some search, I found someone can fix it by reinstall libpcap-dev, or the following commands: step 1:rm & rmdir any file in '/usr/include/pcap';'/usr/local/include/pcap' step 2:Download libpcap by 'sudo apt-get install libpcap0.8-dev' step 3:./autogen.sh in wireshark dir step 4:make clean & make & make install However, neither is working on ubuntu 12.04/wireshark 1.8.3 Anyone can help?Read the article
