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• VS2010 Gotcha: Inadvertently targeting the wrong framework

  I love VS2010s multi-framework targeting feature, yet it has bitten me in the rear-end more than once. The problem is that I have created projects in .NET 3.5 without realizing it, then at some point, when something doesnt work as expected, if Im lucky I discover the mistake. Typically, this happens after you have explicitly chosen .NET 3.5 as the target framework. Then every project after that will be .NET 3.5 until you explicitly choose .NET 4.0 again. This morning that wasnt the case. I was...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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• Visual Studio 2010 Videos Refresh

  The DevExpress Channels video content is getting an IDE makeover. New videos and screencasts will use the Visual Studio 2010 IDE with DXperience v2010.x release. Some of the popular older videos are also getting re-recorded to show off new and changed product features. For example, this week youll see old (and some new) videos about the versatile and multi-platform reporting suite: XtraReports. In case you didn't know, from DXperience v2010.1 onwards, XtraReports works on these platforms:...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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• How to remove items from an arraylist without shrinking the list [migrated]

  - by user73710

  I have a case where I am using the ArrayList to keep a list of items that are keyed by their position in the list. Other objects reference the ArrayList items by their position. If I delete one of the items from the list, I don't want the list to shrink because that would invalidate all other references to items in the list (e.g. item 2 is now in position 1). My solution to the shrinking array list problem is to null the position in the arraylist so that the list will not shrink. I am curious whether this will free the memory formerly held by the item at that position. If there is a better way to accomplish this requirement, I would like to know about it.

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• Variable-step update() in game loop is falling behind, how can I get around this?

  - by ThatsGobbles

  I'm working on a minimal game engine for my next game. I'm using the delta update method like shown: void update(double delta) { // Update code that uses `delta` goes here } I have a deep hierarchy of updatable objects, with a root updatable that contains several updatables, each of which contains more updatables, etc. Normally I'd just iterate through each of the root's children and update each one, which would then do the same for its children, and so on. However, passing a fixed value of delta to the root means that by the time the leaf updatables are reached, it's been longer since delta seconds that have elapsed. This is causing noticable desyncing in my game, and time synchronization is very important in my case (I'm working on a rhythm game). Any ideas on how I should tackle this? I've considered using StopWatches and a global readable timer, but any advice would be helpful. I'm also open to moving to fixed timesteps as opposed to variable.

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• F# - When do you use a type class instead of a record when you do not want to use mutable fields?

  - by fairflow

  I'm imagining a situation where you are creating an F# module in a purely functional style. This means objects do not have mutable fields and are not modified in place. I'm assuming for simplicity that there is no need to use .NET objects or other kinds of objects. There are two possible ways of implementing an object-oriented kind of solution: the first is to use type classes and the second to use records which have fields of functional type, to implement methods. I imagine you'd use classes when you want to use inheritance but that otherwise records would be adequate, if perhaps clumsier to express. Or do you find classes more convenient than records in any case?

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• Systray not showing

  - by tnrgus

  I have an application called foo that runs as root. The foo calls system function to execute the other application which show tray icon using Qt. The Systray Icon Example in Qt is working properly in user account but not in root. I run the following command to drop privileges: system(“exec su -l user -c ‘export DISPLAY=:0; /opt/systray &’”); However, the systray icon doesn’t appear in Ubuntu 13.10 & 14.04. Is there any way to display this systray in this case except for the solution that uses a PPA that comes with to re-enable the systray whitelist?

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• What is the most handy function you've ever came across? [closed]

  - by Viniyo Shouta

  Obviously everything is 'handy' when it comes to programming terms, but some get a highlight spot, like containers, matrix trasnformation functions and many others. But in this case please mention the one it was more handy to you, saved you from sparing hours resolving a problem, or even the one you like more, What is it and what does it does? I'll start with an example. Language: C++ Function: std::sort (STL) What does it does: Arranges the elements in a specified range into a nondescending order or according to an ordering criterion specified by a binary predicate. (It arranges a container in decreasing order) Why of this question? Because I want to learn how to if possible make my own implementations of these functions for pure studying purposes, to enhance knowledge

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• How to start learning Programming? [on hold]

  - by user107080

  Most of the time people ask which programming language to learn which I know is not valid question to ask here and I don't care about 'which' here, I care about 'How'. So, how do I start learning programming from scratch? in other words, what are the steps for absolute beginner to learn programming the right way? I'm sure buying a book and reading it is not the only way in this case. Again, I don't want to ask which but I want also to know if there are specific languages that will make my start as solid as possible because I know that some can hurt my mindset of programming point of view.

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• Partition Hard Drive For Data

  - by user211779

  Greetings ~ I am a new Linux/Ubuntu user. For various reasons (mostly my own ignorance) I am on my third install of Ubuntu 12.04. I want to partition the hard drive to create a drive for data and personal files in case I ever have to install again. I have been struggling all afternoon to make a gparted live USB. Tuxboot looked like the answer but I get an error message when using it. So, I am asking for help. Ultimately, I want to partition the hard drive for data and personal files. What do you recommend?

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• How do I get the wireless card on a Lenovo S205 working?

  - by user206829

  I tried to install 12.04, 13.04, and now 13.10 on the machine and followed all the instructions that made sense that I could find and still have not gotten wifi to work. It keeps it hard blocked for some reason, not sure why and not sure anyone out there either has figured it out because I would have found it on Google. When I boot from the formatted USB drive, I have WiFi and everything working, why doesn't work after the USB drive is removed? What driver is the USB/wubi or whatever using so that I can install it and have things working? I could have used wubi and installed Ubuntu like that, but I want to make this machine a fully dedicated Ubuntu machine. The laptop is a Lenovo S205 in case anyone can help. I really would like to use 12.04 or higher, i don't want to downgrade to an older version of Ubuntu if at all possible.

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• Mac HDD Is Encrypted

  - by user206844

  I have the hard drive from a PowerMac G5, which was my old computer before it died and I upgraded to Ubuntu Studio. The hard drive its self still works well, but on Ubuntu I can't access most of the files. I plugged it into my MacBook Air and changed some of the perms on some of the folders as a test. This worked for a few, but for others, I was getting the same message Cannot access folder. Access denied. I would like to use this as an external HDD (I have a case and everything), but it's kind of pointless if I can't access the folders that I want. After looking around for a couple of hours, I couldn't find anything that actually gave me an answer. I would like to know if: Anybody else has come upon this problem, If so, have you found a solution? and, What is it?

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• Large Sprite Performance

  - by Iansen

  I've got a large Sprite generated using a set of vertices(x,y coordinates) and a bitmap pattern (using moveTo, lineTo, beginBitmapFill, endFill ...etc). It's about 15000 pixels wide and between 1500 - 2000 pixels high depending on the level -it's the terrain for a 2D game. My question is: what is the best way to display/move it on the stage - performance wise? Currently I'm just adding it to the stage as is...I get decent frame rate/ memory/ cpu usage but I want to optimize it for slower PCs. Any ideas? I've been reading a little about blitting but I'm not sure how to implement it in my case. Thanks.

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• What is wrong with this code for reading binary files? [on hold]

  - by qed

  What is wrong with this code for reading binary files? It compiles OK, but will not print out the file as planned, in fact, it prints nothing at all. #include <iostream> #include <fstream> int main(int argc, const char *argv[]) { if (argc < 2) { ::std::cerr << "usage: " << argv[0] << " <filename>\n"; return 1; } ::std::basic_ifstream<unsigned char> in(argv[1], ::std::ios::binary); unsigned char uc; while (in.get(uc)) { printf("%02X ", uc); } // TODO: error handling, in case the file could not be opened or read return 0; }

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• Cisco VPN error 403: Unable to contact the security gateway

  - by mtashev

  I'm trying to make a connection via Cisco VPN Client (version is 5.0.07.0290), but i get the below mentioned error. I have to say that i'm using Windows 8. "Secure VPN Connection terminated locally by the Client. Reason 403: Unable to contact the security gateway." I've tried several fixes, but none of them worked. The display name in regedit is the correct, and my certificates are ok as well. If i switch to TCP (the default is UDP) i get error 414. Firewall is off. Any suggestions will be appreciated.

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• Firefox 3.6 Kiosk mode

  - by David Murdoch

  I've developed a FF 3.6+ only web app that needs to run in kiosk mode. I has assumed that since nearly every other browser has a built in kiosk switch FF would have this too. I haven't been able to find this. http://kb.mozillazine.org/Command_line_arguments does not have a kiosk mode listed. R-Kiosk doesn't work in FF 3.6. Apparently their is a new "experimental" version of R-Kiosk (v0.8.0) but I can't find it anywhere. Does anyone know of anyway to put Firefox in kiosk mode? I'd be especially great if the solution forced full screen, hid all toolbars and context menus, disables (Ctrl+) Alt + * combos, and disables "Windows Key" + * combos.

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• Testing radius server from Mac OS X client

  - by Calvin Froedge

  I have a radius server set up on a server running Ubuntu 11.04. I have configured my switch to use the authentication server's IP (192.168.1.2) for RADIUS / 802.1x authentication, and I created a connection to test connecting from my Mac OSX client. Here is my radius configuration for the client: client 192.168.1.0/16 { secret = testing123 } I can successfully authenticate using both 127.0.0.1 (localhost) and 192.168.1.2 (ip of eth1), so I know radius is getting those requests. I set up a connection to test from my macbook, and my requests are timing out. http://screencast.com/t/tMhRLS3H7 Is there a better way to test the radius connection from my macbook? Thanks! UPDATE: I was able to successfully test on Mac OSX client using RadPerf. This is available as a cross-platform command line tool.

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• Python version issues

  - by MidnightLightning

  I have a Mac which uses MacPorts to have multiple versions of Python installed and use the python_select application to switch between them. Currently, this Mac has OS 10.6.6, which comes with Python 2.6.1 installed as /usr/bin/python. Using MacPorts, I've installed the python27, python31, and python_select ports and now have this issue: python_select seems to not be switching the default python properly: $ which python /usr/bin/python $ python -V Python 2.6.1 $ /usr/bin/python -V Python 2.6.1 $ sudo python_select python27 Selecting version "python27" for python $ which python /opt/local/bin/python $ ls -l /opt/local/bin/python lrwxr-xr-x 1 root admin 24B Mar 18 10:24 /opt/local/bin/python -> /opt/local/bin/python2.7 $ python -V Python 2.6.1 # <-- Wrong!!! $ /opt/local/bin/python -V Python 2.7.1 # <-- Why are you not default? So, after running python_select, which python seems to think that the /opt/local/bin version is going to be used, but in reality, it seems that the /usr/bin one is taking precedent unless I specifically call the /opt/local/bin one. Is there something I'm doing wrong?

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• MS Windows Server 2008R2 slow file copy, slow network connection

  - by MattrixHax

  i just setup a windows 2008R2 standard server, with the only installed app being Hyper-V, and only 1 windows XP VM is running. Whenever i try to copy a file from my windows 7 laptop over to the 2008R2 server machine's admin shares ( \\servername\c$ ) the files start transferring around 60mb/s and then drop to around 5mb/s. My windows 7 machine and the server 2008 machine are both in WORKGROUP (no domain here). when i try the same transfer to our server 2003 box the transfer speeds are fine. tried disabling autotuning (netsh interface tcp set global autotuninglevel=disabled) as well as turning off the checksum offload to the adapter (tx and rx) - i still see strange packet errors (bad header checksum) using wireshark and just cannot seem to track down what the issue is - over 1 hour to transfer 4gb of files from 1 server to another that are on the same GB switch is just crazy.... any ideas would be greatly appreciated!

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• I have bluescreen-phobia

  - by Charlie Somerville

  I'm scared of the Blue Screen of Death. Seriously. Whenever I hibernate or shutdown my computer, I have to turn the screen off in case it bluescreens during that process. Whenever I see a bluescreen, it makes my heart skip a beat and I jump a little - especially if it's on my own computer. I decided that this is getting ridiculous after I experienced a BSOD this evening. My computer booted back up and I decided to switch off the screen and leave the room. I came back about a minute later and it still hadn't got to the login screen. To find out what happened, I actually covered the screen with two A4 pages and gradually peeled them back after I saw that the screen wasn't blue. This is going way too far, but I can't help it. I am legitimately afraid of BSODs. Does anyone have any advice on how I can help myself?

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• How to change RDS licensing mode from 'per user/device' to 'Remote control for administrators' on Wi

  - by Prashant Mandhare

  We have installed windows 2008 R2 enterprise on a Dell server. This server is placed remotely in data center and only administrator is going to access it for maintenance purpose. No multiple users or client remote access is needed Now during 'remote desktop services' role installation network admin accidentally selected 'per user/device' licensing mode. Because of which now 120 days free try period is ticking. Since only administrator is going to access this server remotely we need to have 'Remote control for administrators' licensing mode (like windows 2003) on it. How we can change licensing mode from 'per user/device' to 'Remote control for administrators' on 2008 server? Also will it be possible to do this change remotely using RDC session itself? or do i need to change it using physical console (if remote access is gonna be disabled during switch)?

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• How to disable Bluetooth auto-answer on Windows 7?

  - by MarkR

  When my BlackBerry 9630 is connected via Bluetooth to my Dell desktop running Windows 7 x64 there are a bunch of Bluetooth services enabled on Windows Advanced Audio BB Bypass service BB Desktop Service Dial-up Networking Headset Audio Gateway Remote Control Remotely Controlled Device When a call arrives on the 9630 Windows immediately answer the call. This is annoying when windows answers the phone before I even hear an audible ring and the hapless caller is saying, "hello. hello" on top of music I have playing. Does anyone know how to tell Windows not to answer the call? I want to be able to don my headset, switch audio to my headset, THEN manually answer the call.

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• How HP D2700 disk enclosure is monitored for alarms via SNMP

  - by VSAC

  We have HP D2700 disk enclosure and we would like to monitor D2700 (connected to HP Proliant DL360G8) for alarms.I have following questions regarding this. What are the options available for reporting D2700 hardware alarms (disk failure, power failure) via SNMP? We understand the D2700 to have an Ethernet interface for controller A and B and alarms are available via SNMP via this interface. Can anyone provide the actual alarms via this interface? (MIB and alarm list) As we have a number of D2700’s and would like to minimize the number of physical connections to the switch and associated IP addresses; Is there a mechanism to monitor the D2700 from the SCSI connected HPDL360 and raise SNMP alarms from the DL360 for hardware failures on the D2700? If so can anyone provide details and the actual alarms and MIB via this mechanism? Thanks!

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• Juniper SSG-5 subinterface vlan routing to the internet

  - by catfish

  I'm unable to get a brand new Juniper SSG-5 with latest 6.3.0r05 firmware routing to the internet from a subinterface I created on bgroup0 setup as vlan2 (bgroup0.1 on "wifi" zone). When connected on the default vlan it gets on the internet just fine. When I switch to vlan2 I'm unable to get to the internet. I am able to get the correct ip address (10.150.0.0/24) from dhcp, able to get to the juniper management page, etc but nothing past the firewall, can't ping 4.2.2.2 or the internet gateway. Even setting up logging on the wifi-to-untrust policy and it does shows the attempts (it's it's timeouts). 172.31.16.0/24 is the untrusted lan, it's already nat'ed but works fine for testing. Can ping this ip from the default vlan but not from vlan2 192.168.1.0/24 is the trusted main lan 10.150.0.0/24 is the wifi isolated lan on vlan2 The idea is to setup an AP with lan and guest access (AP supports multiple ssid's on different vlans). I know I can setup the juniper to use different ports for the wifi lan and use their procurve switch to do the vlan separation, but I never used vlan'ing on a Juniper firewall and I would like to try it out this way. Here is the complete config file: unset key protection enable set clock timezone -5 set vrouter trust-vr sharable set vrouter "untrust-vr" exit set vrouter "trust-vr" unset auto-route-export exit set alg appleichat enable unset alg appleichat re-assembly enable set alg sctp enable set auth-server "Local" id 0 set auth-server "Local" server-name "Local" set auth default auth server "Local" set auth radius accounting port 1646 set admin name "netscreen" set admin password "xxxxxxxxxxxxxxxx" set admin auth web timeout 10 set admin auth dial-in timeout 3 set admin auth server "Local" set admin format dos set zone "Trust" vrouter "trust-vr" set zone "Untrust" vrouter "trust-vr" set zone "DMZ" vrouter "trust-vr" set zone "VLAN" vrouter "trust-vr" set zone id 100 "Wifi" set zone "Untrust-Tun" vrouter "trust-vr" set zone "Trust" tcp-rst set zone "Untrust" block unset zone "Untrust" tcp-rst set zone "MGT" block unset zone "V1-Trust" tcp-rst unset zone "V1-Untrust" tcp-rst set zone "DMZ" tcp-rst unset zone "V1-DMZ" tcp-rst unset zone "VLAN" tcp-rst unset zone "Wifi" tcp-rst set zone "Untrust" screen tear-drop set zone "Untrust" screen syn-flood set zone "Untrust" screen ping-death set zone "Untrust" screen ip-filter-src set zone "Untrust" screen land set zone "V1-Untrust" screen tear-drop set zone "V1-Untrust" screen syn-flood set zone "V1-Untrust" screen ping-death set zone "V1-Untrust" screen ip-filter-src set zone "V1-Untrust" screen land set interface "ethernet0/0" zone "Untrust" set interface "ethernet0/1" zone "Untrust" set interface "bgroup0" zone "Trust" set interface "bgroup0.1" tag 2 zone "Wifi" set interface "bgroup1" zone "DMZ" set interface bgroup0 port ethernet0/2 set interface bgroup0 port ethernet0/3 set interface bgroup0 port ethernet0/4 set interface bgroup0 port ethernet0/5 set interface bgroup0 port ethernet0/6 unset interface vlan1 ip set interface ethernet0/0 ip 172.31.16.243/24 set interface ethernet0/0 route set interface bgroup0 ip 192.168.1.1/24 set interface bgroup0 nat set interface bgroup0.1 ip 10.150.0.1/24 set interface bgroup0.1 nat set interface bgroup0.1 mtu 1500 unset interface vlan1 bypass-others-ipsec unset interface vlan1 bypass-non-ip set interface ethernet0/0 ip manageable set interface bgroup0 ip manageable set interface bgroup0.1 ip manageable set interface ethernet0/0 manage ping set interface ethernet0/1 manage ping set interface bgroup0.1 manage ping set interface bgroup0.1 manage telnet set interface bgroup0.1 manage web unset interface bgroup1 manage ping set interface bgroup0 dhcp server service set interface bgroup0.1 dhcp server service set interface bgroup0 dhcp server auto set interface bgroup0.1 dhcp server enable set interface bgroup0 dhcp server option gateway 192.168.1.1 set interface bgroup0 dhcp server option netmask 255.255.255.0 set interface bgroup0 dhcp server option dns1 8.8.8.8 set interface bgroup0.1 dhcp server option lease 1440 set interface bgroup0.1 dhcp server option gateway 10.150.0.1 set interface bgroup0.1 dhcp server option netmask 255.255.255.0 set interface bgroup0.1 dhcp server option dns1 8.8.8.8 set interface bgroup0 dhcp server ip 192.168.1.33 to 192.168.1.126 set interface bgroup0.1 dhcp server ip 10.150.0.50 to 10.150.0.100 unset interface bgroup0 dhcp server config next-server-ip unset interface bgroup0.1 dhcp server config next-server-ip set interface "serial0/0" modem settings "USR" init "AT&F" set interface "serial0/0" modem settings "USR" active set interface "serial0/0" modem speed 115200 set interface "serial0/0" modem retry 3 set interface "serial0/0" modem interval 10 set interface "serial0/0" modem idle-time 10 set flow tcp-mss unset flow no-tcp-seq-check set flow tcp-syn-check unset flow tcp-syn-bit-check set flow reverse-route clear-text prefer set flow reverse-route tunnel always set pki authority default scep mode "auto" set pki x509 default cert-path partial set crypto-policy exit set ike respond-bad-spi 1 set ike ikev2 ike-sa-soft-lifetime 60 unset ike ikeid-enumeration unset ike dos-protection unset ipsec access-session enable set ipsec access-session maximum 5000 set ipsec access-session upper-threshold 0 set ipsec access-session lower-threshold 0 set ipsec access-session dead-p2-sa-timeout 0 unset ipsec access-session log-error unset ipsec access-session info-exch-connected unset ipsec access-session use-error-log set url protocol websense exit set policy id 1 from "Trust" to "Untrust" "Any" "Any" "ANY" permit set policy id 1 exit set policy id 2 from "Wifi" to "Untrust" "Any" "Any" "ANY" permit log set policy id 2 exit set nsmgmt bulkcli reboot-timeout 60 set ssh version v2 set config lock timeout 5 unset license-key auto-update set telnet client enable set snmp port listen 161 set snmp port trap 162 set snmpv3 local-engine id "0162122009006149" set vrouter "untrust-vr" exit set vrouter "trust-vr" unset add-default-route set route 0.0.0.0/0 interface ethernet0/0 gateway 172.31.16.1 exit set vrouter "untrust-vr" exit set vrouter "trust-vr" exit

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• Using Linux LVM, can I change the number of stripes and "rebalance" the logical volume?

  - by mss

  I created a RAID10 by adding two RAID1 md devices as physical volumes to a volume group. Unfortunately it looks like I forgot to specify the number of stripes when I created the logical volumes (it was late): PV VG Fmt Attr PSize PFree /dev/md312 volume lvm2 a- 927.01G 291.01G /dev/md334 volume lvm2 a- 927.01G 927.01G I know that I can move all the data of a logical volume from one physical volume to another with pvmove. It also looks like lvextend supports an -i switch to change the number of stripes. Is there any way to combine these two, ie. change the number of stripes and "rebalance" the data over the stripes based on the allocation policy? According to this mail by Ross Walker from March 2010 it isn't possible but maybe this has changed since then.

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• Dual-screen Multimedia Control Suite for Linux (like Screen Monkey)

  - by samjetski

  I'm looking for some linux software to manage and control a dual monitor/multi screen setup for use in professional-like presentations (ie: monitor1=control, monitor2=projector/audience). I have the dual-monitor configured with my gnome desktop running over both monitors (that's the easy part). What I'm looking for is a neat/seamless way to switch between, say, OpenOffice Impress, DVD Player, VLC live video, Lyricue, other software on monitor2. To have monitor2 shown to the audience and run neat presentations of DVDs, Slideshows, etc. whilst controlling it from monitor1. I can run slideshows, play a DVD on monitor2 (drag & drop VLC on monitor2, and go fullscreen) etc. but this is rather messy in a presentation environment. I found this software: Screen Monkey. Looks like an excellent windows equivalent for what I want to do. Is there anything similar for linux? For Gnome, KDE, anything else X based? Thanks, SamJ

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