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  • How to efficiently implement a blocking call with Rails, while letting the client wait for the reply

    - by Kyle Heironimus
    We have a web service written in Rails. The API is published and we cannot change it. Our app communicates with a remote web service that sometimes hangs or takes several seconds to reply. Client -> Our Web Service -> Remote Web Service Currently, if the remote web service hangs for 5 seconds, one of our rails processes on our web service also hangs with it, which is what we need to avoid. I've seen things such as mod-x-sendfile, modporter, and delayed jobs, but the best I can tell, they all assume the client is not waiting for an answer. Since the API is already established, we cannot tell the client "I'm attempting to do what you want, check back later for the answer." The best option we have come up with so far is to add a second, non-rails web server running eventmachine to process these particular calls. Is there a better way?

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  • how to handle db concurrency in client-server application in C#?

    - by RAJ K
    I am developing an application in C# WPF which will have Client-Server architecture (Client will do products sales billing). I am novice in this area and I asked this question to start my development process. Click here to view question. So, ultimately I have selected MySQl, WCf & WPF. Now I have one silly question. Do i need to handle DB concurrency explicitly in my application (like 3 clients inserting data same time) or MySQl will handle this without any conflict? To accomplish my project i thought, I will create a service in WCf which will do DB queries from client application. Do you have any suggestion to improve my application performance.

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  • How do you calculate the offset to the client area in WPF?

    - by chris
    I want to position a modal dialog (progress window) at the top right corner of the parent window client area. This code will put it in the corner of the non-client area, but how do I calculate the offset to the client area? this.Owner=owner; this.Left=owner.Left+owner.ActualWidth-Width; this.Top=owner.Top; Edit: I found this 'solution' that works for normal windows: this.Left=owner.Left+owner.ActualWidth-Width-SystemParameters.ResizeFrameVerticalBorderWidth; this.Top=owner.Top+SystemParameters.ResizeFrameHorizontalBorderHeight+SystemParameters.WindowCaptionHeight; This would however fail for windows that have customized borders. EDIT: The code should work regardless of the systems DPI setting (e.g. 120 instead of 96).

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  • Talking with a Bittorrent client listening on a port?

    - by Legend
    I have one of my computers seeding a torrent file on port 45000. I am trying to write a small client in python (or perhaps perl) that helps me to determine the types of messages this client supports for which I need to perhaps do a handshake with the client. In Azureus, this is done using a call like peer.getSupportedMessages(). Is it possible to do this using some library in python or perl? An example of the returned messages would look like this: BT_KEEP_ALIVE BT_PIECE BT_REQUEST BT_UNCHOKE BT_UNINTERESTED BT_SUGGEST_PIECE BT_HAVE_ALL BT_HAVE_NONE BT_REJECT_REQUEST BT_ALLOWED_FAST BT_LT_EXT_MESSAGE BT_DHT_PORT lt_handshake ut_pex

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  • Why exactly is server side HTML rendering faster than client side?

    - by mvbl fst
    I am working on a large web site, and we're moving a lot of functionality to the client side (Require.js, Backbone and Handlebars stack). There are even discussions about possibly moving all rendering to the client side. But reading some articles, especially ones about Twitter moving away from client side rendering, which mention that server side is faster / more reliable, I begin to have questions. I don't understand how rendering fairly simple HTML widgets in JS from JSON and templates is a contemporary browser on a dual core CPU with 4-8 GB RAM is any slower than making dozens of includes in your server side app. Are there any actual real life benchmarking figures regarding this? Also, it seems like parsing HTML templates by server side templating engines can't be any faster than rendering same HTML code from a Handlebars template, especially if this is a precomp JS function?

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  • Silverlight client load operation failed for query "Login". [GenericParameterNotValid]

    - by cvoeller
    I have one user who gets the following error when trying to login, "Silverlight client load operation failed for query "Login". [GenericParameterNotValid]". The odd thing is that other users are able to login without issue and I can login using the "problem" account from other machines. At this point I think it's got to be a client side configuration issue. My next step is to confirm the Client Side Silverlight Version, but I don't know where to go after that. Do you have any suggestions?

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  • What is the best way to sync multiple client SqlServers to one MS SqlServer 2005?

    - by user605055
    I have several client databases that use my windows application. I want to send this data for online web site. The client databases and server database structure is different because we need to add client ID column to some tables in server data base. I use this way to sync databases; use another application and use C# bulk copy with transaction to sync databases. My server database sql server is too busy and parallel task cannot be run. I work on this solution: I use triggers after update, delete, insert to save changes in one table and create sql query to send a web service to sync data. But I must send all data first! Huge data set (bigger than 16mg) I think can't use replication because the structure and primary keys are different.

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  • Can I connect to a 64 bit mysql server from a 32 bit machine with 32 bit mysql client lib?

    - by chenqingzhi
    Can I connect to a 64 bit mysql server from a 32 bit machine with 32 bit mysql client lib? I mean the server is 64 bit version and running on an 64 bit machine and the client app is running on an 32 bit machine with the 32 bit mysql client lib. Is that OK? Or it will cause some problems? I don't have two machine so I can't do the test, can some tell me the answer? Thank you!

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  • error when I use GWT RPC

    - by Sebe
    Hello everyone... I have a problem with Eclipse when I use an RPC.. If I use a single method call it's all in the right direction but if I add a new method to handle the server I get the following error: com.google.gwt.core.client.JavaScriptException: (null): null at com.google.gwt.dev.shell.BrowserChannelServer.invokeJavascript(BrowserChannelServer.java:237) at com.google.gwt.dev.shell.ModuleSpaceOOPHM.doInvoke(ModuleSpaceOOPHM.java:126) at com.google.gwt.dev.shell.ModuleSpace.invokeNative(ModuleSpace.java:561) at com.google.gwt.dev.shell.ModuleSpace.invokeNativeBoolean(ModuleSpace.java:184) at com.google.gwt.dev.shell.JavaScriptHost.invokeNativeBoolean(JavaScriptHost.java:35) at com.google.gwt.user.client.rpc.impl.RpcStatsContext.isStatsAvailable(RpcStatsContext.java) at com.google.gwt.user.client.rpc.impl.RequestCallbackAdapter.onResponseReceived(RequestCallbackAdapter.java:221) at com.google.gwt.http.client.Request.fireOnResponseReceived(Request.java:287) at com.google.gwt.http.client.RequestBuilder$1.onReadyStateChange(RequestBuilder.java:395) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at com.google.gwt.dev.shell.MethodAdaptor.invoke(MethodAdaptor.java:103) at com.google.gwt.dev.shell.MethodDispatch.invoke(MethodDispatch.java:71) at com.google.gwt.dev.shell.OophmSessionHandler.invoke(OophmSessionHandler.java:157) at com.google.gwt.dev.shell.BrowserChannelServer.reactToMessagesWhileWaitingForReturn(BrowserChannelServer.java:326) at com.google.gwt.dev.shell.BrowserChannelServer.invokeJavascript(BrowserChannelServer.java:207) at com.google.gwt.dev.shell.ModuleSpaceOOPHM.doInvoke(ModuleSpaceOOPHM.java:126) at com.google.gwt.dev.shell.ModuleSpace.invokeNative(ModuleSpace.java:561) at com.google.gwt.dev.shell.ModuleSpace.invokeNativeObject(ModuleSpace.java:269) at com.google.gwt.dev.shell.JavaScriptHost.invokeNativeObject(JavaScriptHost.java:91) at com.google.gwt.core.client.impl.Impl.apply(Impl.java) at com.google.gwt.core.client.impl.Impl.entry0(Impl.java:214) at sun.reflect.GeneratedMethodAccessor13.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at com.google.gwt.dev.shell.MethodAdaptor.invoke(MethodAdaptor.java:103) at com.google.gwt.dev.shell.MethodDispatch.invoke(MethodDispatch.java:71) at com.google.gwt.dev.shell.OophmSessionHandler.invoke(OophmSessionHandler.java:157) at com.google.gwt.dev.shell.BrowserChannelServer.reactToMessages(BrowserChannelServer.java:281) at com.google.gwt.dev.shell.BrowserChannelServer.processConnection(BrowserChannelServer.java:531) at com.google.gwt.dev.shell.BrowserChannelServer.run(BrowserChannelServer.java:352) at java.lang.Thread.run(Thread.java:619) Can I have more services in an asynchronous call right? Where am I wrong? This is my implementation MyService: package de.vogella.gwt.helloworld.client; import com.google.gwt.user.client.rpc.RemoteService; public interface MyService extends RemoteService { //chiamo i metodi presenti sul server public void creaXML(String nickname,String pass,String email2,String gio,String mes, String ann); public void setWeb(String userCorrect,String query, String titolo,String snippet,String url); } MyServiceAsync package de.vogella.gwt.helloworld.client; import com.google.gwt.user.client.rpc.AsyncCallback; public interface MyServiceAsync { void creaXML(String nickname,String pass,String email2,String gio,String mes, String ann,AsyncCallback<Void> callback); void setWeb(String userCorrect,String query, String titolo,String snippet,String url, AsyncCallback<Void> callback); } RPCService: package de.vogella.gwt.helloworld.client; import com.google.gwt.core.client.GWT; import com.google.gwt.user.client.rpc.AsyncCallback; import com.google.gwt.user.client.rpc.ServiceDefTarget; import com.google.gwt.user.client.ui.FlexTable; public class RPCService implements MyServiceAsync { MyServiceAsync service = (MyServiceAsync) GWT.create(MyService.class); ServiceDefTarget endpoint = (ServiceDefTarget) service; public RPCService() { endpoint.setServiceEntryPoint(GWT.getModuleBaseURL() + "rpc"); } public void creaXML(String nickname,String pass,String email2,String gio,String mes, String ann,AsyncCallback callback) { service.creaXML(nickname, pass, email2, gio, mes, ann, callback); } public void setWeb(String userCorrect,String query, String titolo,String snippet,String url,AsyncCallback callback) { service.setWeb(userCorrect,query, titolo,snippet,url,callback); } } MyServiceImpl package de.vogella.gwt.helloworld.server; import java.io.*; import org.w3c.dom.*; import org.xml.sax.SAXException; import javax.xml.parsers.DocumentBuilder; import javax.xml.parsers.DocumentBuilderFactory; import javax.xml.parsers.ParserConfigurationException; import javax.xml.transform.*; import javax.xml.transform.dom.DOMSource; import javax.xml.transform.stream.StreamResult; import de.vogella.gwt.helloworld.client.MyService; import com.google.gwt.user.client.ui.FlexTable; import com.google.gwt.user.server.rpc.RemoteServiceServlet; import com.google.gwt.xml.client.Element; import com.google.gwt.xml.client.NodeList; public class MyServiceImpl extends RemoteServiceServlet implements MyService { //metodo che inserisce il nuovo iscritto public void creaXML(String nickname,String pass,String email2,String gio,String mes, String ann){ ....... } public void setWeb(String userCorrect,String query, String titolo,String snippet,String url) { ..... } In the app in client-side I do RPCService rpc2 = New RPCService() rpc2.setWeb(..,...,...,...,callback); and RPCService rpc = New RPCService() rpc.creaXML(..,...,...,...,callback); (in other posizions in the code...) and.. AsyncCallback callback = new AsyncCallback() { public void onFailure(Throwable caught) { Window.alert("Failure!"); } public void onSuccess(Object result) { Window.alert("Successoooooo"); } }; Web.xml: <?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN" "http://java.sun.com/dtd/web-app_2_3.dtd"> <web-app> <!-- Servlets --> <!-- Default page to serve --> <welcome-file-list> <welcome-file>De_vogella_gwt_helloworld.html</welcome-file> </welcome-file-list> <servlet> <servlet-name>rPCImpl</servlet-name> <servlet-class>de.vogella.gwt.helloworld.server.MyServiceImpl</servlet-class> </servlet> <servlet-mapping> <servlet-name>rPCImpl</servlet-name> <url-pattern>/de_vogella_gwt_helloworld/rpc</url-pattern> </servlet-mapping> </web-app> Thank you all for your attention Sebe

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  • SQL replicaton - collecting data

    - by Cicik
    Hi, I have master SQL server with DB Central and a lot of satellite SQL servers with DB Client. I need to collect data from log tables(LogTable) on Client(each client has own ID in log table) to one big table on Central(LogTableCentral). Data must go only from Client to Central On each Client I want to have only data for this Client I need solution with minimal amount of work on client side because of count of clients Central is MS SQL server Enterprise, Clients are MS SQL server 2005, 2008 Thanks a lot EDIT: data can be collected periodically(for example: every day at 01:00)

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  • ERROR: Linux route add command failed: external program exited with error status: 4

    - by JohnMerlino
    A remote machine running fedora uses openvpn, and multiple developers were successfully able to connect to it via their client openvpn. However, I am running Ubuntu 12.04 and I am having trouble connecting to the server via vpn. I copied ca.crt, home.key, and home.crt from the server to my local machine to /etc/openvpn folder. My client.conf file looks like this: ############################################## # Sample client-side OpenVPN 2.0 config file # # for connecting to multi-client server. # # # # This configuration can be used by multiple # # clients, however each client should have # # its own cert and key files. # # # # On Windows, you might want to rename this # # file so it has a .ovpn extension # ############################################## # Specify that we are a client and that we # will be pulling certain config file directives # from the server. client # Use the same setting as you are using on # the server. # On most systems, the VPN will not function # unless you partially or fully disable # the firewall for the TUN/TAP interface. ;dev tap dev tun # Windows needs the TAP-Win32 adapter name # from the Network Connections panel # if you have more than one. On XP SP2, # you may need to disable the firewall # for the TAP adapter. ;dev-node MyTap # Are we connecting to a TCP or # UDP server? Use the same setting as # on the server. ;proto tcp proto udp # The hostname/IP and port of the server. # You can have multiple remote entries # to load balance between the servers. remote xx.xxx.xx.130 1194 ;remote my-server-2 1194 # Choose a random host from the remote # list for load-balancing. Otherwise # try hosts in the order specified. ;remote-random # Keep trying indefinitely to resolve the # host name of the OpenVPN server. Very useful # on machines which are not permanently connected # to the internet such as laptops. resolv-retry infinite # Most clients don't need to bind to # a specific local port number. nobind # Downgrade privileges after initialization (non-Windows only) ;user nobody ;group nogroup # Try to preserve some state across restarts. persist-key persist-tun # If you are connecting through an # HTTP proxy to reach the actual OpenVPN # server, put the proxy server/IP and # port number here. See the man page # if your proxy server requires # authentication. ;http-proxy-retry # retry on connection failures ;http-proxy [proxy server] [proxy port #] # Wireless networks often produce a lot # of duplicate packets. Set this flag # to silence duplicate packet warnings. ;mute-replay-warnings # SSL/TLS parms. # See the server config file for more # description. It's best to use # a separate .crt/.key file pair # for each client. A single ca # file can be used for all clients. ca ca.crt cert home.crt key home.key # Verify server certificate by checking # that the certicate has the nsCertType # field set to "server". This is an # important precaution to protect against # a potential attack discussed here: # http://openvpn.net/howto.html#mitm # # To use this feature, you will need to generate # your server certificates with the nsCertType # field set to "server". The build-key-server # script in the easy-rsa folder will do this. ns-cert-type server # If a tls-auth key is used on the server # then every client must also have the key. ;tls-auth ta.key 1 # Select a cryptographic cipher. # If the cipher option is used on the server # then you must also specify it here. ;cipher x # Enable compression on the VPN link. # Don't enable this unless it is also # enabled in the server config file. comp-lzo # Set log file verbosity. verb 3 # Silence repeating messages ;mute 20 But when I start server and look in /var/log/syslog, I notice the following error: May 27 22:13:51 myuser ovpn-client[5626]: /sbin/route add -net 10.27.12.1 netmask 255.255.255.252 gw 10.27.12.37 May 27 22:13:51 myuser ovpn-client[5626]: ERROR: Linux route add command failed: external program exited with error status: 4 May 27 22:13:51 myuser ovpn-client[5626]: /sbin/route add -net 172.27.12.0 netmask 255.255.255.0 gw 10.27.12.37 May 27 22:13:51 myuser ovpn-client[5626]: /sbin/route add -net 10.27.12.1 netmask 255.255.255.255 gw 10.27.12.37 And I am unable to connect to the server via openvpn: $ ssh [email protected] ssh: connect to host xxx.xx.xx.130 port 22: No route to host What may I be doing wrong?

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  • tightvnc authentication failure

    - by broiyan
    When I run a tightvnc client to establish a VNC session I sometimes receive an error message that suggests there are repeated failed VNC login attempts or a brute force attack. The message dialog title is "unsupported security type" and the text content is "too many authentication failures, try another connection? yes/no". This problem goes away if I reboot the Ubuntu server and reload the VNC server program and try again. From that point, it will work for multiple VNC sessions. My VNC sessions are typically about 20 minutes. At some time in the future, the problem may recur so it seems correlated to the time the server has been up or the time tightvnc has been loaded. Typically it takes only a day or so before the problem comes back. I am using tightvnc 1.3 on an server running Ubuntu 12.04. The version of vncserver is rather dated because that seems to be all that is available from tightvnc for linux servers. On the client side I use the newest Java-based VNC client (version 2.5) for both Windows access and Ubuntu access. All my VNC sessions are via SSH. I am the only user and I will typically use only the same client computer. How can I stop this problem from recurring? Edit I found the log file. This is a small excerpt of what I am seeing. Essentially, various IPs, not my own, are attempting to connect. What is the practical solution for this? 05/06/12 20:07:32 Got connection from client 69.194.204.90 05/06/12 20:07:32 Non-standard protocol version 3.4, using 3.3 instead 05/06/12 20:07:32 Too many authentication failures - client rejected 05/06/12 20:07:32 Client 69.194.204.90 gone 05/06/12 20:07:32 Statistics: 05/06/12 20:07:32 framebuffer updates 0, rectangles 0, bytes 0 05/06/12 20:24:56 Got connection from client 79.161.16.40 05/06/12 20:24:56 Non-standard protocol version 3.4, using 3.3 instead 05/06/12 20:24:56 Too many authentication failures - client rejected 05/06/12 20:24:56 Client 79.161.16.40 gone 05/06/12 20:24:56 Statistics: 05/06/12 20:24:56 framebuffer updates 0, rectangles 0, bytes 0 05/06/12 20:29:27 Got connection from client 109.230.246.54 05/06/12 20:29:27 Non-standard protocol version 3.4, using 3.3 instead 05/06/12 20:29:28 rfbVncAuthProcessResponse: authentication failed from 109.230.246.54 05/06/12 20:29:28 Client 109.230.246.54 gone 05/06/12 20:29:28 Statistics: 05/06/12 20:29:28 framebuffer updates 0, rectangles 0, bytes 0

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  • Installing PostgreSQL on FreeBSD (with ports)

    - by user22992
    Hey everyone, I am trying to install (using ports) PostgreSQL on a virtual server, running FreeBSD. My one question is this: Which of the following should I install? postgresql-contrib postgresql-docs postgresql-jdbc postgresql-libpgeasy postgresql-libpq++ postgresql-libpqxx postgresql-odbc postgresql-pllua postgresql-plproxy postgresql-plpython postgresql-plruby postgresql-pltcl postgresql-relay postgresql-tcltk postgresql73-client postgresql73-server postgresql74-client postgresql74-server postgresql80-client postgresql80-server postgresql81-client postgresql81-server postgresql82-client postgresql82-server postgresql83-client postgresql83-server Thanks...

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  • How do I get this Cisco VPN client to connect?

    - by WebWeasel
    I've got Ubuntu 10.10 64 bit and installed network-manager-vpnc and configured the connection but I keep getting this: NetworkManager[1217]: <info> Starting VPN service 'org.freedesktop.NetworkManager.vpnc'... NetworkManager[1217]: <info> VPN service 'org.freedesktop.NetworkManager.vpnc' started (org.freedesktop.NetworkManager.vpnc), PID 4420 NetworkManager[1217]: <info> VPN service 'org.freedesktop.NetworkManager.vpnc' appeared, activating connections NetworkManager[1217]: <info> VPN plugin state changed: 1 NetworkManager[1217]: <info> VPN plugin state changed: 3 NetworkManager[1217]: <info> VPN connection 'CSI' (Connect) reply received. modem-manager: (net/tun0): could not get port's parent device NetworkManager[1217]: SCPlugin-Ifupdown: devices added (path: /sys/devices/virtual/net/tun0, iface: tun0) NetworkManager[1217]: SCPlugin-Ifupdown: device added (path: /sys/devices/virtual/net/tun0, iface: tun0): no ifupdown configuration found. kernel: [ 2281.723506] tun0: Disabled Privacy Extensions avahi-daemon[1109]: Withdrawing workstation service for tun0. NetworkManager[1217]: SCPlugin-Ifupdown: devices removed (path: /sys/devices/virtual/net/tun0, iface: tun0) NetworkManager[1217]: <warn> VPN plugin failed: 1 NetworkManager[1217]: <info> VPN plugin state changed: 6 NetworkManager[1217]: <info> VPN plugin state change reason: 0 NetworkManager[1217]: <warn> error disconnecting VPN: Could not process the request because no VPN connection was active. NetworkManager[1217]: <info> Policy set 'Auto eth0' (eth0) as default for IPv4 routing and DNS. NetworkManager[1217]: <info> Starting VPN service 'org.freedesktop.NetworkManager.vpnc'... NetworkManager[1217]: <info> VPN service 'org.freedesktop.NetworkManager.vpnc' started (org.freedesktop.NetworkManager.vpnc), PID 4547 NetworkManager[1217]: <info> VPN service 'org.freedesktop.NetworkManager.vpnc' appeared, activating connections NetworkManager[1217]: <info> VPN plugin state changed: 1 NetworkManager[1217]: <info> VPN plugin state changed: 3 I've seen a couple of bugs on Launchpad that could be the same thing or have I done something wrong?

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  • MMC and Server Manager Authentication Errors - Access Denied

    - by Vazgen
    I'm trying to connect remotely from my Windows 8 client to manage my Hyper-V Server 2012. I have done everything I can find to configure remote management of the server including: Added a net user on server Enabled anonymous dcom access on server and client Added firewall rules for "Windows Firewall Remote Management" and "Windows Management Instrumentation (WMI)" on server Added firewall exception on server for client IP Added cmdkey on client Added server to TrustedHost list on client Added LocalAccountTokenFilter policy registry entry on server Added client IP to server's host file Added server IP to client's host file I cannot believe I am still getting these errors. What's even more strange is that I can connect in Hyper-V Manager and create VM's but not in MMC and Server Manager. I also get Access Denied trying to Open the Authorization Store on my server from my client using Authorization Manager. I'm providing all the errors because I have a feeling they root from the same problem. Does anybody see anything I missed?

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  • Take Control Of Web Control ClientID Values in ASP.NET 4.0

    Each server-side Web control in an ASP.NET Web Forms application has an ID property that identifies the Web control and is name by which the Web control is accessed in the code-behind class. When rendered into HTML, the Web control turns its server-side ID value into a client-side id attribute. Ideally, there would be a one-to-one correspondence between the value of the server-side ID property and the generated client-side id, but in reality things aren't so simple. By default, the rendered client-side id is formed by taking the Web control's ID property and prefixed it with the ID properties of its naming containers. In short, a Web control with an ID of txtName can get rendered into an HTML element with a client-side id like ctl00_MainContent_txtName. This default translation from the server-side ID property value to the rendered client-side id attribute can introduce challenges when trying to access an HTML element via JavaScript, which is typically done by id, as the page developer building the web page and writing the JavaScript does not know what the id value of the rendered Web control will be at design time. (The client-side id value can be determined at runtime via the Web control's ClientID property.) ASP.NET 4.0 affords page developers much greater flexibility in how Web controls render their ID property into a client-side id. This article starts with an explanation as to why and how ASP.NET translates the server-side ID value into the client-side id value and then shows how to take control of this process using ASP.NET 4.0. Read on to learn more! Read More >

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  • Take Control Of Web Control ClientID Values in ASP.NET 4.0

    Each server-side Web control in an ASP.NET Web Forms application has an ID property that identifies the Web control and is name by which the Web control is accessed in the code-behind class. When rendered into HTML, the Web control turns its server-side ID value into a client-side id attribute. Ideally, there would be a one-to-one correspondence between the value of the server-side ID property and the generated client-side id, but in reality things aren't so simple. By default, the rendered client-side id is formed by taking the Web control's ID property and prefixed it with the ID properties of its naming containers. In short, a Web control with an ID of txtName can get rendered into an HTML element with a client-side id like ctl00_MainContent_txtName. This default translation from the server-side ID property value to the rendered client-side id attribute can introduce challenges when trying to access an HTML element via JavaScript, which is typically done by id, as the page developer building the web page and writing the JavaScript does not know what the id value of the rendered Web control will be at design time. (The client-side id value can be determined at runtime via the Web control's ClientID property.) ASP.NET 4.0 affords page developers much greater flexibility in how Web controls render their ID property into a client-side id. This article starts with an explanation as to why and how ASP.NET translates the server-side ID value into the client-side id value and then shows how to take control of this process using ASP.NET 4.0. Read on to learn more! Read More >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 Upload a file from client to server using OFBIZ?

    - by SIVAKUMAR.J
    I'm new to ofbiz so try to keep your answer as simple as possibly. If you can give examples that would be kind. My problem is I created a project inside the ofbiz/hot-deploy folder namely productionmgntSystem. Inside the folder ofbiz\hot-deploy\productionmgntSystem\webapp\productionmgntSystem I created a file app_details_1.ftl. The following are the code of this file <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"> <title>Insert title here</title> <script TYPE="TEXT/JAVASCRIPT" language=""JAVASCRIPT"> function uploadFile() { //alert("Before calling upload.jsp"); window.location='<@ofbizUrl>testing_service1</@ofbizUrl>' } </script> </head> <!-- <form action="<@ofbizUrl>testing_service1</@ofbizUrl>" enctype="multipart/form-data" name="app_details_frm"> --> <form action="<@ofbizUrl>logout1</@ofbizUrl>" enctype="multipart/form-data" name="app_details_frm"> <center style="height: 299px; "> <table border="0" style="height: 177px; width: 788px"> <tr style="height: 115px; "> <td style="width: 103px; "> <td style="width: 413px; "><h1>APPLICATION DETAILS</h1> <td style="width: 55px; "> </tr> <tr> <td style="width: 125px; ">Application name : </td> <td> <input name="app_name_txt" id="txt_1" value=" " /> </td> </tr> <tr> <td style="width: 125px; ">Excell sheet &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;: </td> <td> <input type="file" name="filename"/> </td> </tr> <tr> <td> <!-- <input type="button" name="logout1_cmd" value="Logout" onclick="logout1()"/> --> <input type="submit" name="logout_cmd" value="logout"/> </td> <td> <!-- <input type="submit" name="upload_cmd" value="Submit" /> --> <input type="button" name="upload1_cmd" value="Upload" onclick="uploadFile()"/> </td> </tr> </table> </center> </form> </html> the following coding is present in the file ofbiz\hot-deploy\productionmgntSystem\webapp\productionmgntSystem\WEB-INF\controller.xml ...... ....... ........ <request-map uri="testing_service1"> <security https="true" auth="true"/> <event type="java" path="org.ofbiz.productionmgntSystem.web_app_req.WebServices1" invoke="testingService"/> <response name="ok" type="view" value="ok_view"/> <response name="exception" type="view" value="exception_view"/> </request-map> .......... ............ .......... <view-map name="ok_view" type="ftl" page="ok_view.ftl"/> <view-map name="exception_view" type="ftl" page="exception_view.ftl"/> ................ ............. ............. The following are the coding present in the file ofbiz\hot-deploy\productionmgntSystem\src\org\ofbiz\productionmgntSystem\web_app_req\WebServices1.java package org.ofbiz.productionmgntSystem.web_app_req; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import java.io.DataInputStream; import java.io.FileOutputStream; import java.io.IOException; public class WebServices1 { public static String testingService(HttpServletRequest request, HttpServletResponse response) { //int i=0; String result="ok"; System.out.println("\n\n\t*************************************\n\tInside WebServices1.testingService(HttpServletRequest request, HttpServletResponse response)- Start"); String contentType=request.getContentType(); System.out.println("\n\n\t*************************************\n\tInside WebServices1.testingService(HttpServletRequest request, HttpServletResponse response)- contentType : "+contentType); String str=new String(); // response.setContentType("text/html"); //PrintWriter writer; if ((contentType != null) && (contentType.indexOf("multipart/form-data") >= 0)) { System.out.println("\n\n\t**********************************\n\tInside WebServices1.testingService(HttpServletRequest request, HttpServletResponse response) after if (contentType != null)"); try { // writer=response.getWriter(); System.out.println("\n\n\t**********************************\n\tInside WebServices1.testingService(HttpServletRequest request, HttpServletResponse response) - try Start"); DataInputStream in = new DataInputStream(request.getInputStream()); int formDataLength = request.getContentLength(); byte dataBytes[] = new byte[formDataLength]; int byteRead = 0; int totalBytesRead = 0; //this loop converting the uploaded file into byte code while (totalBytesRead < formDataLength) { byteRead = in.read(dataBytes, totalBytesRead,formDataLength); totalBytesRead += byteRead; } String file = new String(dataBytes); //for saving the file name String saveFile = file.substring(file.indexOf("filename=\"") + 10); saveFile = saveFile.substring(0, saveFile.indexOf("\n")); saveFile = saveFile.substring(saveFile.lastIndexOf("\\")+ 1,saveFile.indexOf("\"")); int lastIndex = contentType.lastIndexOf("="); String boundary = contentType.substring(lastIndex + 1,contentType.length()); int pos; //extracting the index of file pos = file.indexOf("filename=\""); pos = file.indexOf("\n", pos) + 1; pos = file.indexOf("\n", pos) + 1; pos = file.indexOf("\n", pos) + 1; int boundaryLocation = file.indexOf(boundary, pos) - 4; int startPos = ((file.substring(0, pos)).getBytes()).length; int endPos = ((file.substring(0, boundaryLocation)).getBytes()).length; //creating a new file with the same name and writing the content in new file FileOutputStream fileOut = new FileOutputStream("/"+saveFile); fileOut.write(dataBytes, startPos, (endPos - startPos)); fileOut.flush(); fileOut.close(); System.out.println("\n\n\t**********************************\n\tInside WebServices1.testingService(HttpServletRequest request, HttpServletResponse response) - try End"); } catch(IOException ioe) { System.out.println("\n\n\t*********************************\n\tInside WebServices1.testingService(HttpServletRequest request, HttpServletResponse response) - Catch IOException"); //ioe.printStackTrace(); return("exception"); } catch(Exception ex) { System.out.println("\n\n\t*********************************\n\tInside WebServices1.testingService(HttpServletRequest request, HttpServletResponse response) - Catch Exception"); return("exception"); } } else { System.out.println("\n\n\t********************************\n\tInside WebServices1.testingService(HttpServletRequest request, HttpServletResponse response) else part"); result="exception"; } System.out.println("\n\n\t*************************************\n\tInside WebServices1.testingService(HttpServletRequest request, HttpServletResponse response)- End"); return(result); } } I want to upload a file to the server. The file is get from user " tag in the "app_details_1.ftl" file & it is updated into the server by using the method "testingService(HttpServletRequest request, HttpServletResponse response)" in the class "WebServices1". But the file is not uploaded. Give me a good solution for uploading a file to the server.

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  • Citrix Performance monitoring

    - by Dr I
    Hi people, I has a strange thing which appears on my Citrix Farm today. My users are equiped with a Thin client Axel Model 80F, and today, one of them sustained a problem on it. He opened a citrix's Publish Desktop session (Host by a farm of Windows 2003 R2 SP2 Servers), he loaded Lotus Notes and a mail who contained an PDF attached file. Once he has opened his PDF File, his session has freezed. We've just reboot the Thin Client, and log in again on the session (which hasn't been closed during the process). Once we have log in again, we try to read the pdf and once again afer half a page the session freeze again (I can see the mouse moving on the screen but can make anything). Then I close the session, reboot correctly the thin client, and "Tada" with the same manipulationsn averything is correct and we don't facing any freeze. Well Now my question is: Is that bug came from the thin client or the server about you? I've checked on my farm and I don't have any alert from the Citrix's Monitoring console logs. According to me it's due to the Thin Client BUT I ddon't have enought monitoring tools to be sure of that. So do you have some quite godd monitoring tools or method? My config: Windows 2003 R2 SP2 Citrix Xenapp 5.0

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  • Mac OS X Server Open Directory does not push Software Update settings to clients

    - by joxl
    I have an Xserve G5 running Mac OS X Server 10.5.8 configured as an Open Directory master. I have also enabled and configured Software Update service on the machine. The SUS is configured to serve Tiger, Leopard and Snow Leopard clients (see http://discussions.apple.com/message.jspa?messageID=10297359#10297359) The clients bound to the OD are a variety of Mac's running OS X 10.4, 10.5 or 10.6. In Workgroup Manager, I have created 3 machine groups for each client OS. Each group is configured with a custom SUS URL, and the managed client computers are members accordingly (see http://discussions.apple.com/thread.jspa?messageID=10493154#10493154) My problem is that the server pushes the SUS settings to some of the client machines, but not all. When I first configured all this stuff on the server (a few weeks ago) I was closely monitoring a few of the client machines to confirm that they received the custom settings. I noticed that some of the clients (10.4/5/6 alike) seemed to get the settings immediately, others didn't show the new settings until after a reboot. As I said, results are mixed across OS's, but some clients will not "sync" at all. My immediate thought was to unbind/rebind the problematic machines. I did this on several client computers with no success. For example, today I was working on one of the Tiger clients. I noticed it was not pointed at my local SUS, so I checked the OD binding; it was fine. Just to be sure I unbound the machine. Next, I checked WM and confirmed the computer record was gone. I noticed the machine group still had a residual (broken?) member from the unbound client; I manually removed this. Finally, I re-bound the client to OD and re-added the machine to it's correct group in WM. Unfortunately, the client still pings apple's SUS for updates. Just to play it safe I rebooted the client, but to no avail, it will not see my local SUS. To confirm that there is nothing wrong with the server, or the client's connection to it, forcefully pointed the machine at my SUS: sudo defaults write /Library/Preferences/com.apple.SoftwareUpdate CatalogURL "$LOCAL_SUS_URL" and the machine successfully updated off my local server. Great, successful updates, but problem not solved. I've done exhaustive reading on discussions.apple.com (not saying I read everything, I'm just saying I have read a lot) without a good answer. The discouraging thing is that a lot of OD problems I've read about only result in the sysadmin completely reinstalling the server, or OD, or some other similarly heavy-handed operation. At this point, I am not willing to go that route. I still have hope that I can find the reason for this flaky behavior. If anyone can point me in a helpful direction it would be much appreciated. EDIT: Indeed, some files are being pushed to the client: # from client machine: $ sudo find /Library -type f -name com.apple.SoftwareUpdate.plist /Library/Managed Preferences/com.apple.SoftwareUpdate.plist /Library/Managed Preferences/username/com.apple.SoftwareUpdate.plist /Library/Preferences/com.apple.SoftwareUpdate.plist A few weeks ago, prior to my (previously mentioned) modifications, the SUS was still running "stock". Which meant it could not serve SL (10.6) machines. At that time, the Software Update settings were setup in WM under User Groups. This didn't make any sense because some users work on multiple machines with different OS's. Before creating Machine Groups in WM, I deleted all the SU settings from the User Group Preferences. This just makes the whole thing more confusing, because when I see a file here: /Library/Managed Preferences/username/com.apple.SoftwareUpdate.plist I assume it's still remaining from the "old" settings, because I wouldn't think a Machine Setting belongs there. Despite all the com.apple.SoftwareUpdate.plist hanging around under the Managed Preferences, why does the client machine still call home to Apple and not my SUS? # on client machine: $ date Tue Jan 25 17:01:46 EST 2011 $ softwareupdate --list Software Update Tool Copyright 2002-2005 Apple No new software available. switch terminals... # on server: $ tail -n1 /var/log/swupd/swupd_access_log 10.x.x.x - - [25/Jan/2011:15:54:29 -0500] XXXX POST "/cgi-bin/SoftwareUpdateServerStats" 200 13 ... Notice the date of the client softwareupdate and the latest access to the SUS server; the server never heard a peep from that client.

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  • Apache mod_wsgi error: ImportError: No module named django.core.handlers.wsgi

    - by bigmac
    I am using Python 2.7 with mod_python 3.3.1 and mod_wsgi 3.3. I get an Internal Server Error and this stack trace in the apache logs: [Thu Apr 21 10:25:37 2011] [error] [client 83.244.243.242] import django.core.handlers.wsgi [Thu Apr 21 10:25:37 2011] [error] [client 83.244.243.242] ImportError: No module named django.core.handlers.wsgi [Thu Apr 21 10:25:37 2011] [error] [client 83.244.243.242] mod_wsgi (pid=4463): Target WSGI script '/home/one/codebase/campman/wsgi_handler.py' cannot be loaded as Python module. [Thu Apr 21 10:25:37 2011] [error] [client 83.244.243.242] mod_wsgi (pid=4463): Exception occurred processing WSGI script '/home/one/codebase/campman/wsgi_handler.py'. [Thu Apr 21 10:25:37 2011] [error] [client 83.244.243.242] Traceback (most recent call last): [Thu Apr 21 10:25:37 2011] [error] [client 83.244.243.242] File "/home/one/codebase/campman/wsgi_handler.py", line 13, in <module> [Thu Apr 21 10:25:37 2011] [error] [client 83.244.243.242] import django.core.handlers.wsgi [Thu Apr 21 10:25:37 2011] [error] [client 83.244.243.242] ImportError: No module named django.core.handlers.wsgi

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  • Windows 2008 RemoteAPP client disconnects within a matter of minutes.

    - by Jeroen Wilke
    I'm having an odd problem with Windows 2008 TS, and remote applications specifically. The situation is as follows: TS idle timeout is disabled via GPO TS terminating disconnected sessions after 1hr (via GPO) My users can log on to the Terminal server, and get a full desktop, OR via rdp files that give access to a few remote applications. When a user connects to a full desktop, everything is fine and dandy, they will remain logged on indefinately, and when they disconnect the session is terminated after an hour. however, when a user connects using a remote application link, the client seems to disconnect after only a few minutes of inactivity, when you click the window, the session reconnects. EventID's on TS server: 4779: This event is generated when a user disconnects from an existing Terminal Services session, or when a user switches away from an existing destop using Fast User Switching. 4778 : This event is generated when a user reconnects to an existing Terminal Services session, or when a user switches to an existing desktop using Fast User Switching users are connecting directly to 3389, not using a TS-gateway at the moment. This behavior is consistent on different clients that we have, Full desktop is fine, RemoteAPP constantly disconnects. The .rdp file used doesn't list any interesting parameters, aside from what application to launch, and where to find it. Can someone explain to me how there can be a difference in behaviour between full desktop, and remoteapp ? since essentially they use the exact same client ? Regards Jeroen

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  • What breaks in a Windows domain if a member has a high time skew?

    - by Ryan Ries
    It's taken for granted by most IT people that in a Windows domain, if a member server's clock is off by more than 5 minutes (or however many minutes you've configured it for) from that of its domain controller - logons and authentications will fail. But that is not necessarily true. At least not for all authentication processes on all versions of Windows. For instance, I can set my time on my Windows 7 client to be skewed all to heck - logoff/logon still works fine. What happens is that my client sends an AS_REQ (with his time stamp) to the domain controller, and the DC responds with KRB_AP_ERR_SKEW. But the magic is that when the DC responds with the aforementioned Kerberos error, the DC also includes his time stamp, which the client in turn uses to adjust his own time and resubmits the AS_REQ, which is then approved. This behavior is not considered a security threat because encryption and secrets are still being used in the communication. This is also not just a Microsoft thing. RFC 4430 describes this behavior. So my question is does anyone know when this changed? And why is it that other things fail? For instance, Office Communicator kicks me off if my clock starts drifting too far out. I really wish to have more detail on this. edit: Here's the bit from RFC 4430 that I'm talking about: If the server clock and the client clock are off by more than the policy-determined clock skew limit (usually 5 minutes), the server MUST return a KRB_AP_ERR_SKEW. The optional client's time in the KRB-ERROR SHOULD be filled out. If the server protects the error by adding the Cksum field and returning the correct client's time, the client SHOULD compute the difference (in seconds) between the two clocks based upon the client and server time contained in the KRB-ERROR message. The client SHOULD store this clock difference and use it to adjust its clock in subsequent messages. If the error is not protected, the client MUST NOT use the difference to adjust subsequent messages, because doing so would allow an attacker to construct authenticators that can be used to mount replay attacks.

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  • What is the correct term for - server/client database sync via API?

    - by Daniel
    Forgive the vague question title. I've been programming mobile apps for 3 years now, and I've got a little too far from the web services and server side code then I probably should have. Anyway, I'm doing a personal project now and I want to create an web API for it. One of my requirements is to check for updates from my app, so I would send a timestamp to the API. I've used many APIs that my clients prepared for me and only now am I appreciating their work ! What is the term or technique used to create an API backed by a database which tracks changes via dates/timestamps, basically an effective way for me to query changes occurring since a timestamp. Simply put, I want that my app can call my API in order to sync new data and changed data from the server, to the app. The app would only have a timestamp of the last time it synced with the server. Would I have a log table for each data table in my database which adds a record for each change? Then I could query all changes with a timestamp superior to the one passed to the API. Can anyone point me in the right direction on this?

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