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• Doing asynchronous distributed request/response service calls without WCF

  - by Ralf Westphal

  In my previous blog post I hopefully was able to demonstrate how low the entry barrier is to asynchronous remote communication. It´s as easy as hosting a service like this    10   using ( var serverSpace = new CcrSpace ().ConfigureAsHost( "wcf.port=8000" ))    11 {    12      serverSpace.HostPort(    13                     ...(read more)

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• How do people deal with Android fragmentation?

  - by Bill

  I've spent the past few years working on iOS apps, and I'm now giving some serious consideration to creating an Android port of one of my apps. I'm sure that complaints about fragmentation are a frustrating cliche to experienced Android programmers, but as an iOS programmer, I'm quite honestly overwhelmed by the number of configurations and devices that my app might end up running on. There are literally thousands of Android devices in the wild, but I know there are successful Android developers in the world and I know they're not testing or developing for thousands of different devices. So how can a relatively small company deal with fragmentation? Is it possible to pick the five or six most popular devices, focus on those and prevent the app from being installed on any other devices? Are there any other strategies for practically dealing with the number of different configurations an app will face?

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• How to unhide an application?

  - by blacklaptop

  I hope you can help me. I have installed ubuntu 12.04 using wubi, my issue is i installed iptux using ubuntu software center, it worked fine, i decided that i wanted it to be hidden at start up, so i changed its setting in preferences. i assumed that if i needed to use it i could go to internet menu and select it. But after restarting i found that after i click on iptux under Internet nothing happens, but i click it after that then a small window shows Fatal Error!! Failed to bind the TCP/UDP port(2425)! Address already in use. I have tried uninstalling using ubuntu software center and reinstalling it but it still had the same problem. I thought it maybe because some files were not uninstalled by USC, so i installed synaptic and uninstalled iptux (complete uninstallation) and then reinstalled it and the same situation occurs. I was hoping someone could inform me how i could unhide iptux. Thank You

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• Developing for Chrome App/Android?

  - by Johnny Quest

  I have been developing for win7 mobile (XNA/silverlight and will continue to do so, love everything about it) but I wanted to branch a few of my more polished games to google app store online, and perhaps android(though not sure, as with all the different versions it makes learning/loading applications a bit tricky) What is the most versatile language to start learning from chrome apps/android: Java would be excellent for android, but could I port it to a web app for chrome? (and its close to C#) Flash would work for a web app as I can just embed it into a html page (have done actionscript before, didn't care much for the IDE though), but would it also work on android? or I guess there is always C/C++ but haven't heard much about that, though I think it works for both (though C++ does interest me) Any advice would be excellent, thanks.

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• DNS records: make mydomain.com work without www

  - by brentonstrine

  I am trying to configure DNS on my domain, however, I can only get it to work with the www prefix. Right now I have the following DNS A records: @ A 123.456.789 www A 123.456.789 http://www.mydomain.com works perfectly. But http://mydomain.com fails. I've tried all of the following: mydomain.com A 123.456.789 mydomain A 123.456.789 * A 123.456.789 But it always goes to port :80 requires a username and password. Except now it's somehow being redirected to a spammers website.

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• Ubuntu Touch Official Hardware? [duplicate]

  - by user1628

  This question already has an answer here: Where can I get a device with 'Ubuntu for phones' pre-installed? 1 answer I really like the look of Ubuntu touch and I want it ASAP, however, I am NOT willing to buy a device simply to port ubuntu touch on it. I don't want to void all warranties and take any risks. Therefore, I am really just waiting for official ubuntu touch hardware (devices made for ubuntu touch). I can't find any rumours or estimated release dates online, in fact, I can't find out anything at all. Can anyone? If so, what and where? When do you think they'll be official hardware? What price do you think it'll be? Do you think canonical/ubuntu will manufacture it themselves? Thanks, Zach

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• Game server for an android/iOS turn-based board-game

  - by Cyril

  I am currently programming an iPhone game and I would like to create an online multiplayer mode. In the future, this app will be port to Android devices, so I was wondering how to create the game-server? First at all, which language should I choose? How to make a server able to communicate both with programs written in objective-c and Java? Then, how to effectively do it? Is it good if I open a socket by client (there'll be 2)? What kind of information should I send to the server? to the clients?

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• Game server for an android/iOS turn-based board-game

  - by Cyril

  I am currently programming an iPhone game and I would like to create an online multiplayer mode. In the future, this app will be port to Android devices, so I was wondering how to create the game-server? First at all, which language should I choose? How to make a server able to communicate both with programs written in objective-c and Java? Then, how to effectively do it? Is it good if I open a socket by client (there'll be 2)? What kind of information should I send to the server? to the clients?

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• Permissions & File Structure w/ nginx & multiple sites

  - by Michael

  I am using nginx for the first time as a long time Apache user. I setup a Linode to test everything and to eventually port over my websites. Previously I had /home/user/www (wwwroot) I am looking at doing something similar with /srv/www/domain/www (wwwroot) Rather than using /srv/domain (wwwroot), the reason is many of the sites are WordPress and one of the things I do for security is to move the config file one level above wwwroot and can't have multiple configuration files from multiple domains in the same top level folder. Since I own all the sites, I wasn't going to create a user for each domain. My user is a member of www-data and was going to use 2770 for www and have domain/www for each new domain. www would be owned by group www-data. Is this the best way to handle this?

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• RPi and Java Embedded GPIO: Sensor Hardware for Java Enabled Interface

  - by hinkmond

  Now here's the hardware you'll need to make a Java app interface with a static charge sensor connected to your Raspberry Pi via the GPIO port. It means another Fry's run of course. That's not too bad during Christmas since you can browse all the gadget and toys while doing your shopping for sensor hardware for your RPi. Here's a your shopping list: 1 - NTE312 JFET N-channel transistor (this is in place of the MPF-102) 1 - Set of Jumper Wires 1 - LED 1 - 300 ohm resistor 1 - set of header pins Grab all that from Fry's or your local hobby electronics shop and come back here for how to connect it together. Oh, and don't go too crazy buying all the other electronic toys and gadgets that catch your eye because of the holiday displays at the store. Hinkmond

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• Apache on Mac Mavericks issue [migrated]

  - by Michael

  Trying to run Apache so that I can create a testing server on my mac.When I start apache it starts, but it doesn't run (no connection to local host. Ill upload the unix,you'll see that after starting there is no processes, and I did a check to show you what was running on my port 80... I don't entirely know that means. Michaels-MacBook-Pro-3:~ michaelramos$ sudo apachectl start Michaels-MacBook-Pro-3:~ michaelramos$ ps aux | grep httpd michaelramos 348 0.0 0.0 2442000 624 s000 S+ 8:51AM 0:00.00 grep httpd Michaels-MacBook-Pro-3:~ michaelramos$ sudo apachectl start org.apache.httpd: Already loaded Michaels-MacBook-Pro-3:~ michaelramos$ sudo lsof -i ':80' COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME ocspd 96 root 18u IPv4 0x8402f926599c58df 0t0 TCP dhcp-92-67.radford.edu:49267->108.162.232.196:http (ESTABLISHED) ocspd 96 root 20u IPv4 0x8402f926599c58df 0t0 TCP dhcp-92-67.radford.edu:49267->108.162.232.196:http (ESTABLISHED) ocspd 96 root 21u IPv4 0x8402f926599c50f7 0t0 TCP dhcp-92-67.radford.edu:49268->108.162.232.206:http (ESTABLISHED) ocspd 96 root 23u IPv4 0x8402f926599c50f7 0t0 TCP dhcp-92-67.radford.edu:49268->108.162.232.206:http (ESTABLISHED)

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• Setting up UPS monitoring

  - by Andrew Heath

  I have acquired a second hand Uninterrupted Power Supply (UPS) that I have refurbished (new battery) and hope to use with my Ubuntu 12.10 system. It's a SOLA 330 with serial out. I have installed NUT Metapackage and NUT Monitor from Software Centre, but am not sure how to go about setting it all up. A Google search brings up several ways of configuring Network UPS Tools (NUT) or HAL-Drivers, however, HAL-Drivers appears to be obsolete and many commands and config files mentioned to edit do not exist in 12.10 or the current version of NUT (most articles are a few years old). One tutorial seemed to work except the Error: no UPS definitions found in ups.conf even though ups.conf has values in it as laid out in the tutorial. How do I go about setting my system to monitor the UPS for a shut down signal? Also, is there a command to determine the UPS is communicating through the serial connection and on what port (to help with setup and configuring, eg. /dev/ttyS0 is mentioned in one of the tutorials I read).

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• tomcat behind apache

  - by dannynjust

  i am trying to use the mod_proxy_ajp to forward all the request from tocat.example.com to example.com:8080 here is what the tomcat server.xml looks like: <Connector port="8009" protocol="AJP/1.3" redirectPort="8443" /> and here is the apache.conf config: <VirtualHost *:80> ServerName tomcat.example.com ServerAdmin [email protected] ErrorLog logs/tomcat.example.com-error_log CustomLog logs/tomcat.example.com-access_log common <Proxy *> AddDefaultCharset Off Order deny,allow Allow from all </Proxy> ProxyPass / ajp://example:8009/ ProxyPassReverse / ajp://example:8009/ </VirtualHost> but it is not working, any idea?

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• Corona SDK (Lua) vs Native Obj-C for iPhone only word puzzle type game [closed]

  - by dodgy_coder

  I am trying to decide on whether to use the Corona SDK & Lua versus native Objective-C to develop an iOS app. This will be the first game on any smartphone I have developed and so its not that ambitious - a single player word puzzle type game - something sort of like scrabble. The advantages of Corona I can see are: Lua is probably easier to learn than Obj-C (shorter learning curve) meaning a possibly quicker development time Possibility to port to Android once its finished Advantages of native Obj-C are: Access to all and latest features of iOS More / faster available libraries Has anyone made this decision before? Are there any major advantages or disadvantages I've missed or got wrong here? Thanks.

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• Threads are facing deadlock in socket program [migrated]

  - by ankur.trapasiya

  I am developing one program in which a user can download a number of files. Now first I am sending the list of files to the user. So from the list user selects one file at a time and provides path where to store that file. In turn it also gives the server the path of file where does it exist. I am following this approach because I want to give stream like experience without file size limitation. Here is my code.. 1) This is server which gets started each time I start my application public class FileServer extends Thread { private ServerSocket socket = null; public FileServer() { try { socket = new ServerSocket(Utils.tcp_port); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } @Override public void run() { try { System.out.println("request received"); new FileThread(socket.accept()).start(); } catch (IOException ex) { ex.printStackTrace(); } } } 2) This thread runs for each client separately and sends the requested file to the user 8kb data at a time. public class FileThread extends Thread { private Socket socket; private String filePath; public String getFilePath() { return filePath; } public void setFilePath(String filePath) { this.filePath = filePath; } public FileThread(Socket socket) { this.socket = socket; System.out.println("server thread" + this.socket.isConnected()); //this.filePath = filePath; } @Override public void run() { // TODO Auto-generated method stub try { ObjectInputStream ois=new ObjectInputStream(socket.getInputStream()); try { //************NOTE filePath=(String) ois.readObject(); } catch (ClassNotFoundException e) { // TODO Auto-generated catch block e.printStackTrace(); } File f = new File(this.filePath); byte[] buf = new byte[8192]; InputStream is = new FileInputStream(f); BufferedInputStream bis = new BufferedInputStream(is); ObjectOutputStream oos = new ObjectOutputStream( socket.getOutputStream()); int c = 0; while ((c = bis.read(buf, 0, buf.length)) > 0) { oos.write(buf, 0, c); oos.flush(); // buf=new byte[8192]; } oos.close(); //socket.shutdownOutput(); // client.shutdownOutput(); System.out.println("stop"); // client.shutdownOutput(); ois.close(); // Thread.sleep(500); is.close(); bis.close(); socket.close(); } catch (IOException ex) { ex.printStackTrace(); } } } NOTE: here filePath represents the path of the file where it exists on the server. The client who is connecting to the server provides this path. I am managing this through sockets and I am successfully receiving this path. 3) FileReceiverThread is responsible for receiving the data from the server and constructing file from this buffer data. public class FileReceiveThread extends Thread { private String fileStorePath; private String sourceFile; private Socket socket = null; public FileReceiveThread(String ip, int port, String fileStorePath, String sourceFile) { this.fileStorePath = fileStorePath; this.sourceFile = sourceFile; try { socket = new Socket(ip, port); System.out.println("receive file thread " + socket.isConnected()); } catch (IOException ex) { ex.printStackTrace(); } } @Override public void run() { try { ObjectOutputStream oos = new ObjectOutputStream( socket.getOutputStream()); oos.writeObject(sourceFile); oos.flush(); // oos.close(); File f = new File(fileStorePath); OutputStream os = new FileOutputStream(f); BufferedOutputStream bos = new BufferedOutputStream(os); byte[] buf = new byte[8192]; int c = 0; //************ NOTE ObjectInputStream ois = new ObjectInputStream( socket.getInputStream()); while ((c = ois.read(buf, 0, buf.length)) > 0) { // ois.read(buf); bos.write(buf, 0, c); bos.flush(); // buf = new byte[8192]; } ois.close(); oos.close(); // os.close(); bos.close(); socket.close(); //Thread.sleep(500); } catch (IOException ex) { ex.printStackTrace(); } } } NOTE : Now the problem that I am facing is at the first time when the file is requested the outcome of the program is same as my expectation. I am able to transmit any size of file at first time. Now when the second file is requested (e.g. I have sent file a,b,c,d to the user and user has received file a successfully and now he is requesting file b) the program faces deadlock at this situation. It is waiting for socket's input stream. I put breakpoint and tried to debug it but it is not going in FileThread's run method second time. I could not find out the mistake here. Basically I am making a LAN Messenger which works on LAN. I am using SWT as UI framework.

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• Noting happens when I connect my Iphone 3G to my laptop

  - by Allwar

  Hi, how do i connect my iphone to my laptop (ubuntu 10.04) so that i can sync music and be able to look at it as a usb stick? (this is what I want to do but there is a problem.) When i connect it to my laptop nothing happens, it doesn't show up as an ikon or as a mass storage device. My Iphone runs 4.2.1 it's an Iphone 3G and it's not jailbroken for the moment, is that a problem? My laptop is an Asus 1201n ubuntu 10.04 (64-bits) Bus 002 Device 005: ID 05ac:1292 Apple, Inc. iPhone 3G I connected my Ipod Video (30 gb) and that one doesn't appear as well So I'm kind of stuck now. The problem probably lies in the system, because the usb port is working. Bus 002 Device 006: ID 05ac:1209 Apple, Inc. iPod Video

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• Help deploying using Capistrano to HostGator

  - by Kyle Macey

  My company uses HostGator to host our web sites, and I'm having a heck of a time figuring out what my final steps are to get a functioning RoR app up there. I've got all the way up to configuring mongrel (I think?) and being able to run deploy:cold without any errors. However, I can't seem to get the app to show up in the designated CPanel area (HG says the name "current" is already reserved for another application), and I'm not sure which port was allowed for me to use. I've opened tickets with Customer Support just to be told that "You can't access the database with root"... Totally unrelated to my question... So I think I'm in the final stretch and if anyone has any insight or experience with HostGator, please cue me in.

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• Ubuntu 12.10 stopped during booting

  - by Alberto

  Good morning, I'm very new to Ubuntu. I decided to change to Ububtu (12.10) for my old laptop (Compaq Presario R3000 with AMD Athlon XP 2800+) that previously used Windows XP. After the installation, the PC restarted but, after a certain activity of the HDD stopped. Menwhile, no information from the screen (blank). Then I retried in recovery mode and the activity stopped at a certain point. I write the last two lines: [ 11.020922] pcmcia_socket pcmcia_socket0: cs: IO port probe 0x3000-0x7fff: [ 11.021676] excluding 0x3000-0x30ff 0x3400-0x34ff 0x3800-0x38ff 0x3c00-0x3cff I don't know how to solve the problem. Thanks in advance for the help.

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• Ubuntu One Windows Client 3.0.1 - Sync not connecting

  - by Tweezak

  I've got sync working at home on Natty and I need to access files at work. I've just installed client 3.0.1 at work on Windows 7. It's finding my account and sees what devices are already set up for sync but it just repeatedly tries to sync (File sync starting...) and after a while fails (File Sync is disconnected.). This cycle loops endlessly. I'm suspicious that it's a problem with my proxy setup. My employer doesn't use a manual proxy configuration but instead uses an automatic configuration script at a specific http address. Does U1 recognize that kind of setup or is it only looking for a proxy server in the form of an address/port?

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• A specific user is unable to log in to vsftpd

  - by HackToHell

  I am setting up a new user let his name be ftpguy. He has access to only one directory /var/www/xxx. I have already chowned the directory so that he has write and read privileges. The user is also unable to login via ssh as I have disabled that by changing his shell to /sbin/nologin. Also, in vsftpd config, I have enabled the chroot_local_user. Now whenever I log in from ftp, i get an auth error. Connect socket #1008 to xxxxxxxx, port 21... 220 Welcome to blah FTP service. USER ftpguy 331 Please specify the password. PASS **** 530 Login incorrect. I changed the password to something different several times, using the passwd command, nothing happens, i still the above error. However I am able to log in with my ssh creditals to my ftp server without any problems.(I do not use a key).

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• Internal Mic Ubuntu 12.04 on Compaq Presario CQ50

  - by Genius FDE

  I have problem with the internal microphone not working on Ubuntu 12.04. It looks like a common problem on most of the laptops running ubuntu 12.04. I tried a lot of possible solutions available online but nothing seems to work! sudo aplay -l gives: **** List of PLAYBACK Hardware Devices **** card 0: NVidia [HDA NVidia], device 0: CONEXANT Analog [CONEXANT Analog] Subdevices: 1/1 Subdevice #0: subdevice #0 card 0: NVidia [HDA NVidia], device 3: HDMI 0 [HDMI 0] Subdevices: 1/1 Subdevice #0: subdevice #0 By the way, the Laptop has no HDMI port! I've seen the same problem with Sony laptop but the mic was working with too much static noise. Thank you.

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• How do I change my resolution to 1600*900 for a wide screen monitor?

  - by Madhu

  How do I change my resolution to 1600*900 for a wide screen monitor in Oneiric? My Hardware configuration is as below: madhu@madhu-Home:~$ lspci 00:00.0 Host bridge: Silicon Integrated Systems [SiS] 671MX 00:01.0 PCI bridge: Silicon Integrated Systems [SiS] AGP Port (virtual PCI-to-PCI bridge) 00:02.0 ISA bridge: Silicon Integrated Systems [SiS] SiS968 [MuTIOL Media IO] (rev 01) 00:02.5 IDE interface: Silicon Integrated Systems [SiS] 5513 [IDE] (rev 01) 00:03.0 USB Controller: Silicon Integrated Systems [SiS] USB 1.1 Controller (rev 0f) 00:03.1 USB Controller: Silicon Integrated Systems [SiS] USB 1.1 Controller (rev 0f) 00:03.3 USB Controller: Silicon Integrated Systems [SiS] USB 2.0 Controller 00:04.0 Ethernet controller: Silicon Integrated Systems [SiS] 191 Gigabit Ethernet Adapter (rev 02) 00:05.0 IDE interface: Silicon Integrated Systems [SiS] SATA Controller / IDE mode (rev 03) 00:06.0 PCI bridge: Silicon Integrated Systems [SiS] PCI-to-PCI bridge 00:07.0 PCI bridge: Silicon Integrated Systems [SiS] PCI-to-PCI bridge 00:0f.0 Audio device: Silicon Integrated Systems [SiS] Azalia Audio Controller 00:1f.0 PCI bridge: Silicon Integrated Systems [SiS] PCI-to-PCI bridge 01:00.0 VGA compatible controller: Silicon Integrated Systems [SiS] 771/671 PCIE VGA Display Adapter (rev 10) madhu@madhu-Home:~$ cat /etc/X11/xorg.conf

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• How to learn programming for a medium scale project form a beginner? [closed]

  - by Lin Xiangyu

  I study programming by myself.I have learn servel programming languages. but I never write a project more than 1000 lines. I know the best way to improve programming skills is practise. The problem is many books, just talk about the programming language, or talk about build a project from a high level. Fews of books will teach how to build a middle scale project. For example, I want to build a simple HTTP Server(Nor like Apache or just a simple listenr to a port), a Markdown Parser, or a download tools just like emule or wget. I don't know what to do. I may found peaces of code in the web, or found familiar project in the Github. I don't know how to read the code. I want to some tutorial that can told me how to build the project step by step, teacher me how to write thousands lines of code. Any suggest?

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• How to share internet connection and making the client accessible over the lan

  - by Dario Silva Moran

  I've a Pc with Ubuntu 14.04 connected to a linkys router through wlan0, and I'd like to share internet connection to an AVR with ethernet port. This is pretty simple if only internet connection is required for the AVR: actually, creating an ethernet connection as "Shared with other computers" and setting up the AVR IP configuration to use DHCP works just fine, but that makes a private class A lan between those two; of course ip addresses are not in the range of the LAN the router is managing. So, I tried with static ip on both sides (Ubuntu eth0 and AVR ip). Tried many combinations, none of them work to provide Internet access to the AVR and at the same time make the AVR accessible over the network through his static ip address (say, 192.168.0.110). Any tips around to share??

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• How to config multiple monitor with optimus?

  - by irrational

  I have an Acer Aspire 8951G running 12.04 Pangolin with bumblebee working beautifully. My problem is that when I connect either the VGA port or the HDMI to my projector there is no way I can see to properly set up the resolutions or colours. The default basic display driver sees the projector correctly, but messes up colours and resolutions (on hdmi) and resolutions on VGA. (Its a 1280 X 720 projector) Am I missing some sort of Xorg configuration? nvidia-xconfig does not seem to exist and running optirun nvidia-settings -c :8 opens the settings, but of course only for the one display. I just want a way to set a default config for my projector via VGA or preferably HDMI. Any help would be wonderful.

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