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  • Asp.net MVC jQuery Ajax calls to JsonResult return no data

    - by Maslow
    I have this script loaded on a page: (function() { window.alert('bookmarklet started'); function AjaxSuccess(data, textStatus, xmlHttpRequest) { if (typeof (data) == 'undefined') { return alert('Data is undefined'); } alert('ajax success' + (data || ': no data')); } function AjaxError(xmlHttpRequest, textStatus, errorThrown) { alert('ajax failure:' + textStatus); } /*imaginarydevelopment.com/Sfc*/ var destination = { url: 'http://localhost:3041/Bookmarklet/SaveHtml', type: 'POST', success: AjaxSuccess, error: AjaxError, dataType: 'text',contentType: 'application/x-www-form-urlencoded' }; if (typeof (jQuery) == 'undefined') { return alert('jQuery not defined'); } if (typeof ($jq) == 'undefined') { if (typeof ($) != 'undefined') { $jq = $; } else { return alert('$jq->jquerify not defined'); } } if ($jq('body').length <= 0) { return alert('Could not query body length'); } if ($jq('head title:contains(BookmarkletTest)').length > 0) { alert('doing test'); destination.data = { data: 'BookmarkletTestAjax' }; $jq.ajax(destination); return; } })(); when it is run locally in VS2008's cassini the ajax success shows the returned string from Asp.net MVC, when it is run remotely the ajax success data is null. Here's the controller method that is firing both locally and when run remotely: [AcceptVerbs(HttpVerbs.Post | HttpVerbs.Get)] public string SaveHtml(string data) { var path = getPath(Server.MapPath); System.IO.File.WriteAllText(path,data); Console.WriteLine("SaveHtml called"); Debug.WriteLine("SaveHtml called"); //return Json(new { result = "SaveHtml Success" }); return "SaveHtml Success"; } Once i have it working I was going to remove the GET, but currently accessing the SaveHtml method directly from the webbrowser produces the expected results when testing. So there's something wrong in my javascript I believe, because when I step through there with chrome's developer tools, I see the data is null, and the xmlHttpRequest doesn't appear to have the expected result in it anywhere either. I'm loading jquery via http://ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js

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  • AppletClassLoader exception : class not found

    - by gautam
    Hi, I am getting exception when i am trying to open an applet in my jsp. My jsp and applet is in same directory. My code is like: <object classid="clsid:8AD9C840-044E-11D1-B3E9-00805F499D93" width="720" height="500"`enter code here` type="application/x-java-applet;version=1.5"> <param name="type" value="application/x-java-applet;version=1.5"> <param name="code" value="com.timer.AppletGenerator.class"> <param name="codebase" value="."> <param name="ARCHIVE" value="Applet.jar, jcommon-1.0.0.jar, jfreechart-1.0.0.jar, log4j-1.2.13.jar, itext-1.3.1.jar" embed width="720" height="500" type="application/x-java-applet;version=1.5" code="com.timer.AppletGenerator.class" codebase="." ARCHIVE='Applet.jar, jcommon-1.0.0.jar, jfreechart-1.0.0.jar, log4j-1.2.13.jar, itext-1.3.1.jar' > </embed> </object> My AppletGenerator.class is like: public class AppletGenerator extends JApplet { public void init() { //Some code } } earlier it was woking fine. But now when i sign and verify the new jar its giving exception: load: class com.timer.AppletGenerator.class not found. java.lang.ClassNotFoundException: com.timer.AppletGenerator.class at sun.applet.AppletClassLoader.findClass(Unknown Source) at java.lang.ClassLoader.loadClass(Unknown Source) at sun.applet.AppletClassLoader.loadClass(Unknown Source) at java.lang.ClassLoader.loadClass(Unknown Source) at sun.applet.AppletClassLoader.loadCode(Unknown Source) at sun.applet.AppletPanel.createApplet(Unknown Source) at sun.plugin.AppletViewer.createApplet(Unknown Source) at sun.applet.AppletPanel.runLoader(Unknown Source) at sun.applet.AppletPanel.run(Unknown Source) at java.lang.Thread.run(Unknown Source) Caused by: java.io.IOException: open HTTP connection failed. at sun.applet.AppletClassLoader.getBytes(Unknown Source) at sun.applet.AppletClassLoader.access$100(Unknown Source) at sun.applet.AppletClassLoader$1.run(Unknown Source) at java.security.AccessController.doPrivileged(Native Method) ... 10 more I have searched a lot but didnt get any correct answer. There are few posts regarding this in stactoverflow but that also didnt work. Thanks and Regards,

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  • saving WPF InkCanvas to a JPG - image is getting cropped

    - by Jason
    I have a WPF InkCanvas control I'm using to capture a signature in my application. The control looks like this - it's 700x300 However, when I save it as a JPG, the resulting image looks like this, also 700x300 The code I'm using to save sigPath = System.IO.Path.GetTempFileName(); MemoryStream ms = new MemoryStream(); FileStream fs = new FileStream(sigPath, FileMode.Create); RenderTargetBitmap rtb = new RenderTargetBitmap((int)inkSig.Width, (int)inkSig.Height, 96d, 96d, PixelFormats.Default); rtb.Render(inkSig); JpegBitmapEncoder encoder = new JpegBitmapEncoder(); encoder.Frames.Add(BitmapFrame.Create(rtb)); encoder.Save(fs); fs.Close(); This is the XAML I'm using: <Window x:Class="Consent.Client.SigPanel" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Background="Transparent" Topmost="True" AllowsTransparency="True" Title="SigPanel" Left="0" Top="0" Height="1024" Width="768" WindowStyle ="None" ShowInTaskbar="False" ResizeMode="NoResize" WindowStartupLocation="CenterScreen" > <Border BorderThickness="1" BorderBrush="Black" Background='#FFFFFFFF' x:Name='DocumentRoot' Width='750' Height='400' CornerRadius='10'> <StackPanel HorizontalAlignment="Center" VerticalAlignment="Center"> <TextBlock Name="txtLabel" FontSize="24" HorizontalAlignment="Center" >Label</TextBlock> <InkCanvas Opacity="1" Background="Beige" Name="inkSig" Width="700" Height="300" /> <StackPanel HorizontalAlignment="Center" Orientation="Horizontal"> <Button FontSize="24" Margin="10" Width="150" Name="btnSave" Click="btnSave_Click">Save</Button> <Button FontSize="24" Margin="10" Width="150" Name="btnCancel" Click="btnCancel_Click">Cancel</Button> <Button FontSize="24" Margin="10" Width="150" Name="btnClear" Click="btnClear_Click">Clear</Button> </StackPanel> </StackPanel> </Border> In the past this worked perfectly. I can't figure out what changed that is causing the image to shift when it is saved.

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  • Problem upgrading eclipse rcp app from 3.3 to 3.5 on Mac OS

    - by Alb
    I previously had an eclipse rcp app based on eclipse 3.3 pugins deployed on both windows and mac OS X 10.4. i'm now trying to port the app to java 1.6 and eclipse 3.5 (Build id: 20100218-1602) plugins on Mac OS X 10.5.8 (Leopard). I can launch the product from eclipse 3.5 on windows but not on Mac OS X. I have the 64bit cocoa eclipse IDE and java 6. In the launch configuration I set runtime JRE to JVM 1.6.0 and added required plugins. The plugins validate and everything else looks similar to windows configuration where it works, but when I launch i only get the following two lines in the console: 2010-03-16 13:29:32.742 java[758:10b] [Java CocoaComponent compatibility mode]: Enabled 2010-03-16 13:29:32.744 java[758:10b] [Java CocoaComponent compatibility mode]: Setting timeout for SWT to 0.100000 and then the program appears to just hang indefinitely. There is nothing written to the .log file so I'm not sure what error there is. EDIT: Here's what Yourkit profiling says before all cpu activity stops. +----------------------------------------------------------------------------+----------------+-----------------+ | Name | Time (ms) | Own Time (ms) | +----------------------------------------------------------------------------+----------------+-----------------+ | +---<All threads> | 2,799 100 % | | | | | | | | +---org.eclipse.equinox.launcher.Main.main(String[]) | 1,924 69% | 0 | | | | | | | +---org.eclipse.osgi.framework.eventmgr.EventManager$EventThread.run() | 632 23 % | 0 | | | | | | | +---java.lang.Thread.run() | 135 5 % | 0 | | | | | | | +---java.lang.ClassLoader.loadClassInternal(String) | 106 4 % | 0 | +----------------------------------------------------------------------------+----------------+-----------------+ , and this in the exceptions tab: Exception staticstics +----------------------------------------+--------------+ | Name | Count | +----------------------------------------+--------------+ | +---java.lang.ClassNotFoundException | 102 11 % | | | | | | +---java.net.MalformedURLException | 4 0 % | | | | | | +---java.lang.NoSuchMethodException | 3 0 % | | | | | | +---java.lang.NumberFormatException | 2 0 % | | | | | | +---java.io.FileNotFoundException | 1 0 % | | | | | | +---java.lang.UnsatisfiedLinkError | 1 0 % | +----------------------------------------+--------------+ and here's more details on the ClassNotFoundExceptions mentioned above: java.lang.ClassNotFoundException Start Level Event Dispatcher native ID: 0x8B0B group: 'main' 78 Thread-4 native ID: 0x10B group: 'main' 22 Framework Event Dispatcher native ID: 0xD207 group: 'main' 2 Anyone know why I don't see a trace for this in Eclipse or in any log files? any ideas where I should look? [Updated on: Tue, 16 March 2010 09:37]

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  • Apache mod_rewrite driving me mad

    - by WishCow
    The scenario I have a webhost that is shared among multiple sites, the directory layout looks like this: siteA/ - css/ - js/ - index.php siteB/ - css/ - js/ - index.php siteC/ . . . The DocumentRoot is at the top level, so, to access siteA, you type http://webhost/siteA in your browser, to access siteB, you type http://webhost/siteB, and so on. Now I have to deploy my own site, which was designed with having 3 VirtualHosts in mind, so my structure looks like this: siteD/ - sites/sitename.com/ - log/ - htdocs/ - index.php - sites/static.sitename.com - log/ - htdocs/ - css - js - sites/admin.sitename.com - log/ - htdocs/ - index.php As you see, the problem is that my index.php files are not at the top level directory, unlike the already existing sites on the webhost. Each VirtualHost should point to the corresponding htdocs/ folder: http://siteD.com -> siteD/sites/sitename.com/htdocs http://static.siteD.com -> siteD/sites/static.sitename.com/htdocs http://admin.siteD.com -> siteD/sites/admin.sitename.com/htdocs The problem I cannot have VirtualHosts on this host, so I have to emulate it somehow, possibly with mod_rewrite. The idea Have some predefined parts in all of the links on the site, that I can identify, and route accordingly to the correct file, with mod_rewrite. Examples: http://webhost/siteD/static/js/something.js -> siteD/sites/static.sitename.com/htdocs/js/something.js http://webhost/siteD/static/css/something.css -> siteD/sites/static.sitename.com/htdocs/css/something.css http://webhost/siteD/admin/something -> siteD/sites/admin.sitename.com/htdocs/index.php http://webhost/siteD/admin/sub/something -> siteD/sites/admin.sitename.com/htdocs/index.php http://webhost/siteD/something -> siteD/sites/sitename.com/htdocs/index.php http://webhost/siteD/sub/something -> siteD/sites/sitename.com/htdocs/index.php Anything that starts with http://url/sitename/admin/(.*) will get rewritten, to point to siteD/sites/admin.sitename.com/htdocs/index.php Anything that starts with http://url/sitename/static/(.*) will get rewritten, to point to siteD/sites/static.sitename.com/htdocs/$1 Anything that starts with http://url/sitename/(.*) AND did not have a match already from above, will get rewritten to point to siteD/sites/sitename.com/htdocs/index.php The solution Here is the .htaccess file that I've come up with: RewriteEngine On RewriteBase / RewriteCond %{REQUEST_URI} ^/siteD/static/(.*)$ [NC] RewriteRule ^siteD/static/(.*)$ siteD/sites/static/htdocs/$1 [L] RewriteCond %{REQUEST_URI} ^/siteD/admin/(.*)$ [NC] RewriteRule ^siteD/(.*)$ siteD/sites/admin/htdocs/index.php [L,QSA] So far, so good. It's all working. Now to add the last rule: RewriteCond %{REQUEST_URI} ^/siteD/(.*)$ [NC] RewriteRule ^siteD/(.*)$ siteD/sites/public/htdocs/index.php [L,QSA] And it's broken. The last rule catches everything, even the ones that have static/ or admin/ in them. Why? Shouldn't the [L] flag stop the rewriting process in the first two cases? Why is the third case evaluated? Is there a better way of solving this? I'm not sticking to rewritemod, anything is fine as long as it does not need access to server-level config. I don't have access to RewriteLog, or anything like that. Please help :(

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  • Two different assembly versions "The located assembly's manifest definition does not match the assem

    - by snicker
    I have a project that I am working on that requires the use of the Mysql Connector for NHibernate, (Mysql.Data.dll). I also want to reference another project (Migrator.NET) in the same project. The problem is even though Migrator.NET is built with the reference to MySql.Data with specific version = false, it still tries to reference the older version of MySql.Data that the library was built with instead of just using the version that is there.. and I get the exception listed in the title: ---- System.IO.FileLoadException : Could not load file or assembly 'MySql.Data, Version=1.0.10.1, Culture=neutral, PublicKeyToken=c5687fc88969c44d' or one of its dependencies. The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040) The version I am referencing in the main assembly is 6.1.3.0. How do I get the two assemblies to cooperate? Edit: For those of you specifying Assembly Binding Redirection, I have set this up: <?xml version="1.0" encoding="utf-8" ?> <configuration> <runtime> <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1"> <dependentAssembly> <assemblyIdentity name="MySql.Data" publicKeyToken="c5687fc88969c44d" culture="neutral"/> <bindingRedirect oldVersion="0.0.0.0-6.1.3.0" newVersion="6.1.3.0"/> </dependentAssembly> </assemblyBinding> </runtime> </configuration> I am referencing this the main assembly in another project and still getting the same errors. If my main assembly is copied local to be used in the other assembly, will it use the settings in app.config or does this information have to be included with every application or assembly that references my main assembly?

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  • Trouble converting an MP3 file to a WAV file using Naudio

    - by WebDevHobo
    Naudio Library: http://naudio.codeplex.com/ I'm trying to convert an MP3 file to a WAV file, but I've run in to a small error. I know what's going wrong, but I don't really know how to go about fixing it. Here's the piece of code I'm running: private void button1_Click(object sender, EventArgs e) { using(Mp3FileReader reader = new Mp3FileReader(@"path\to\MP3")) { using(WaveFileWriter writer = new WaveFileWriter(@"C:\test.wav", new WaveFormat())) { int counter = 0; while(reader.Read(test, counter, test.Length + counter) != 0) { writer.WriteData(test, counter, test.Length + counter); counter += 512; } } } } reader.Read() goes into the Mp3FileReader class, and the method looks like this: public override int Read(byte[] sampleBuffer, int offset, int numBytes) { if (numBytes % waveFormat.BlockAlign != 0) //throw new ApplicationException("Must read complete blocks"); numBytes -= (numBytes % waveFormat.BlockAlign); return mp3Stream.Read(sampleBuffer, offset, numBytes); } mp3Stream is an object of the Stream class. The problem is: I'm getting an ArgumentException. MSDN says that this is because the sum of offset and numBytes is greater than the length of sampleBuffer. Documentation: http://msdn.microsoft.com/en-us/library/system.io.stream.read.aspx This happens because I increase the counter every time, but the size of the byte array test remains the same. What I've been wondering is: do I need to increase the size of the array dynamically, or do I need to find out the needed size at the beginning and set it right away? And also, instead of 512, the method in Mp3FileReader returns 365 the first time. Which is the size of a whole block. But I'm writing the full 512. I'm basically just using the read to check if I'm not at the end of the file yet. Do I need to catch the return value and do something with that, or am I good here?

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  • Knopflerfish packaging

    - by Jens
    Hello, I am at the moment creating a matrix which is showing how far Knopflerfish, Equinox and Felix are OSGi 4.2 compliant. So far I looked at the Knopflerfish documentation (Link 1, Link 2) to get an idea of how much of the Core and Compendium specs are actually implemented. The core specification seems to be fully implemented, although there are some inconsistent statements about the Security Layer and the Declarative Services. What makes me wonder is how much of all the Compendium specs are implemented: Remote Services Log Service Http Service Device Access Configuration Admin Service Metatype Service Preferences Service User Admin Service Wire Admin Service IO Connector Service Initial Provisioning UPnP Device Service Declarative Services Event Admin Service Deployment Admin Auto Configuration Application Admin DMT Admin Service Monitor Admin Service Foreign Application Access Blueprint Container Tracker XML Parser Service Position Measurement and State Execution Environment To find out more I downloaded (Download page) the source code of Knopflerfish and had a look at it. It looks like some parts of the spec are implemented through the "original" framework provided by the OSGi Alliance (org.osgi.*). One example is the UPnP package: Does this mean that missing parts which are not directly implemented by Knopflerfish are added through the "original" OSGi framework? And does this also apply to other frameworks like Felix or Equinox?

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  • Github file size limit changed 6/18/13. Can't push now

    - by slindsey3000
    How does this change as of June 18, 2013 affect my existing repository with a file that exceeds that limit? I last pushed 2 months ago with a large file. I have a large file that I have removed locally but I can not push anything now. I get a "remote error" ... remote: error: File cron_log.log is 126.91 MB; this exceeds GitHub's file size limit of 100 MB I added the file to .gitignore after original push... But it still exists on remote (origin) Removing it locally should get rid of it at origin(Github) right? ... but ... it is not letting me push because there is a file on Github that exceeds the limit... https://github.com/blog/1533-new-file-size-limits These are the commands I issued plus error messages.. git add . git commit -m "delete cron_log.log" git push origin master remote: Error code: 40bef1f6653fd2410fb2ab40242bc879 remote: warning: Error GH413: Large files detected. remote: warning: See http://git.io/iEPt8g for more information. remote: error: File cron_log.log is 141.41 MB; this exceeds GitHub's file size limit of 100 MB remote: error: File cron_log.log is 126.91 MB; this exceeds GitHub's file size limit of 100 MB To https://github.com/slinds(omited_here)/linexxxx(omited_here).git ! [remote rejected] master - master (pre-receive hook declined) error: failed to push some refs to 'https://github.com/slinds(omited_here) I then tried things like git rm cron_log.log git rm --cached cron_log.log Same error.

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  • How to configure hbm2java and hbm2dao to add packagename to generated classes

    - by mmm
    Hi, I'm trying to configure hbm2java with maven to generate POJO classes and DAO objects. One of the issues I'm dealing with is package names aren't generated. I'm using the following pom for that: <execution> <id>hbm2java</id> <phase>generate-sources</phase> <goals> <goal>hbm2java</goal> </goals> <inherited>false</inherited> <configuration> <components> <component> <name>hbm2java</name> <implementation>configuration</implementation> </component> </components> <componentProperties> <packagename>package.name</packagename> <configurationfile>target/hibernate3/generated-mappings/hibernane.cfg.xml</configurationfile> </componentProperties> </configuration> </execution> Yet the generated code begins with the following: // default package // Generated 2010-05-17 13:11:51 by Hibernate Tools 3.2.2.GA /** * Messages generated by hbm2java */ public class Messages implements java.io.Serializable { Is there a way to force maven to generate the package part as defined in packagename?

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  • Why is my Android app camera preview running out of memory on my AVD?

    - by Bryan
    I have yet to try this on an actual device, but expect similar results. Anyway, long story short, whenever I run my app on the emulator, it crashes due to an out of memory exception. My code really is essentially the same as the camera preview API demo from google, which runs perfectly fine. The only file in the app (that I created/use) is as below- package berbst.musicReader; import java.io.IOException; import android.app.Activity; import android.content.Context; import android.hardware.Camera; import android.os.Bundle; import android.view.SurfaceHolder; import android.view.SurfaceView; /********************************* * Music Reader v.0001 * Still VERY under construction. * @author Bryan * *********************************/ public class MusicReader extends Activity { private MainScreen main; @Override //Begin activity public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); main = new MainScreen(this); setContentView(main); } class MainScreen extends SurfaceView implements SurfaceHolder.Callback { SurfaceHolder sHolder; Camera cam; MainScreen(Context context) { super(context); //Set up SurfaceHolder sHolder = getHolder(); sHolder.addCallback(this); sHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS); } public void surfaceCreated(SurfaceHolder holder) { // Open the camera and start viewing cam = Camera.open(); try { cam.setPreviewDisplay(holder); } catch (IOException exception) { cam.release(); cam = null; } } public void surfaceDestroyed(SurfaceHolder holder) { // Kill all our crap with the surface cam.stopPreview(); cam.release(); cam = null; } public void surfaceChanged(SurfaceHolder holder, int format, int w, int h) { // Modify parameters to match size. Camera.Parameters params = cam.getParameters(); params.setPreviewSize(w, h); cam.setParameters(params); cam.startPreview(); } } }

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  • ASP.NET MVC 4 async child action

    - by ShadowChaser
    I have an ASP.NET MVC 4 application targeting .NET 4.5. One of our child actions makes a call out to a web service using HttpClient. Since we're blocking on IO waiting for the HttpClient response, it makes a great deal of sense to convert the code to the async/await pattern. However, when MVC 4 attempts to execute the child action, we get the following error message: HttpServerUtility.Execute blocked while waiting for an asynchronous operation to complete. At first glance, it appears as though MVC 4 does not support async/await within a child action. The only remaining option is to run using synchronous code and force a "Wait" on the async task. As we all know, touching .Result or .Wait() on an async task in an ASP.NET context will cause an immediate deadlock. My async logic is wrapped in a class library, so I can't use the "await blah.ConfigureAwait(false)" trick. Remember, tagging "async" on the child action and using await causes an error, and that prevents me from configuring the await. I'm painted into a corner at this point. Is there any way to consume async methods in an MVC 4 child action? Seems like a flat out bug with no workarounds.

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  • org.apache.cxf.interceptor.Fault: Unmarshalling Error: Duplicate default namespace declaration.

    - by JohnC
    Not sure why I am receiving this after the webservice ran and I am trying to return back to my client side bean. The webservice works perfectly outside of my webserver in SoapUI. org.apache.cxf.interceptor.Fault: Unmarshalling Error: Duplicate default namespace declaration. at [row,col {unknown-source}]: [1,321] at org.apache.cxf.jaxb.JAXBEncoderDecoder.unmarshall(JAXBEncoderDecoder.java:764) at org.apache.cxf.jaxb.JAXBEncoderDecoder.unmarshall(JAXBEncoderDecoder.java:623) at org.apache.cxf.jaxb.io.DataReaderImpl.read(DataReaderImpl.java:128) at org.apache.cxf.interceptor.DocLiteralInInterceptor.handleMessage(DocLiteralInInterceptor.java:101) at org.apache.cxf.phase.PhaseInterceptorChain.doIntercept(PhaseInterceptorChain.java:236) at org.apache.cxf.endpoint.ClientImpl.onMessage(ClientImpl.java:671) at org.apache.cxf.transport.http.HTTPConduit$WrappedOutputStream.handleResponseInternal(HTTPConduit.java:2177) at org.apache.cxf.transport.http.HTTPConduit$WrappedOutputStream.handleResponse(HTTPConduit.java:2057) at org.apache.cxf.transport.http.HTTPConduit$WrappedOutputStream.close(HTTPConduit.java:1982) at org.apache.cxf.transport.AbstractConduit.close(AbstractConduit.java:66) at org.apache.cxf.transport.http.HTTPConduit.close(HTTPConduit.java:637) at org.apache.cxf.interceptor.MessageSenderInterceptor$MessageSenderEndingInterceptor.handleMessage(MessageSenderInterceptor.java:62) at org.apache.cxf.phase.PhaseInterceptorChain.doIntercept(PhaseInterceptorChain.java:236) at org.apache.cxf.endpoint.ClientImpl.invoke(ClientImpl.java:483) at org.apache.cxf.endpoint.ClientImpl.invoke(ClientImpl.java:309) at org.apache.cxf.endpoint.ClientImpl.invoke(ClientImpl.java:261) at org.apache.cxf.frontend.ClientProxy.invokeSync(ClientProxy.java:73) at org.apache.cxf.jaxws.JaxWsClientProxy.invoke(JaxWsClientProxy.java:124)

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  • Hidden features of Perl?

    - by Adam Bellaire
    What are some really useful but esoteric language features in Perl that you've actually been able to employ to do useful work? Guidelines: Try to limit answers to the Perl core and not CPAN Please give an example and a short description Hidden Features also found in other languages' Hidden Features: (These are all from Corion's answer) C# Duff's Device Portability and Standardness Quotes for whitespace delimited lists and strings Aliasable namespaces Java Static Initalizers JavaScript Functions are First Class citizens Block scope and closure Calling methods and accessors indirectly through a variable Ruby Defining methods through code PHP Pervasive online documentation Magic methods Symbolic references Python One line value swapping Ability to replace even core functions with your own functionality Other Hidden Features: Operators: The bool quasi-operator The flip-flop operator Also used for list construction The ++ and unary - operators work on strings The repetition operator The spaceship operator The || operator (and // operator) to select from a set of choices The diamond operator Special cases of the m// operator The tilde-tilde "operator" Quoting constructs: The qw operator Letters can be used as quote delimiters in q{}-like constructs Quoting mechanisms Syntax and Names: There can be a space after a sigil You can give subs numeric names with symbolic references Legal trailing commas Grouped Integer Literals hash slices Populating keys of a hash from an array Modules, Pragmas, and command-line options: use strict and use warnings Taint checking Esoteric use of -n and -p CPAN overload::constant IO::Handle module Safe compartments Attributes Variables: Autovivification The $[ variable tie Dynamic Scoping Variable swapping with a single statement Loops and flow control: Magic goto for on a single variable continue clause Desperation mode Regular expressions: The \G anchor (?{}) and '(??{})` in regexes Other features: The debugger Special code blocks such as BEGIN, CHECK, and END The DATA block New Block Operations Source Filters Signal Hooks map (twice) Wrapping built-in functions The eof function The dbmopen function Turning warnings into errors Other tricks, and meta-answers: cat files, decompressing gzips if needed Perl Tips See Also: Hidden features of C Hidden features of C# Hidden features of C++ Hidden features of Java Hidden features of JavaScript Hidden features of Ruby Hidden features of PHP Hidden features of Python

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  • How to pre-load all deployed assemblies for an AppDomain

    - by Andras Zoltan
    Given an App Domain, there are many different locations that Fusion (the .Net assembly loader) will probe for a given assembly. Obviously, we take this functionality for granted and, since the probing appears to be embedded within the .Net runtime (Assembly._nLoad internal method seems to be the entry-point when Reflect-Loading - and I assume that implicit loading is probably covered by the same underlying algorithm), as developers we don't seem to be able to gain access to those search paths. My problem is that I have a component that does a lot of dynamic type resolution, and which needs to be able to ensure that all user-deployed assemblies for a given AppDomain are pre-loaded before it starts its work. Yes, it slows down startup - but the benefits we get from this component totally outweight this. The basic loading algorithm I've already written is as follows. It deep-scans a set of folders for any .dll (.exes are being excluded at the moment), and uses Assembly.LoadFrom to load the dll if it's AssemblyName cannot be found in the set of assemblies already loaded into the AppDomain (this is implemented inefficiently, but it can be optimized later): void PreLoad(IEnumerable<string> paths) { foreach(path p in paths) { PreLoad(p); } } void PreLoad(string p) { //all try/catch blocks are elided for brevity string[] files = null; files = Directory.GetFiles(p, "*.dll", SearchOption.AllDirectories); AssemblyName a = null; foreach (var s in files) { a = AssemblyName.GetAssemblyName(s); if (!AppDomain.CurrentDomain.GetAssemblies().Any( assembly => AssemblyName.ReferenceMatchesDefinition( assembly.GetName(), a))) Assembly.LoadFrom(s); } } LoadFrom is used because I've found that using Load() can lead to duplicate assemblies being loaded by Fusion if, when it probes for it, it doesn't find one loaded from where it expects to find it. So, with this in place, all I now have to do is to get a list in precedence order (highest to lowest) of the search paths that Fusion is going to be using when it searches for an assembly. Then I can simply iterate through them. The GAC is irrelevant for this, and I'm not interested in any environment-driven fixed paths that Fusion might use - only those paths that can be gleaned from the AppDomain which contain assemblies expressly deployed for the app. My first iteration of this simply used AppDomain.BaseDirectory. This works for services, form apps and console apps. It doesn't work for an Asp.Net website, however, since there are at least two main locations - the AppDomain.DynamicDirectory (where Asp.Net places it's dynamically generated page classes and any assemblies that the Aspx page code references), and then the site's Bin folder - which can be discovered from the AppDomain.SetupInformation.PrivateBinPath property. So I now have working code for the most basic types of apps now (Sql Server-hosted AppDomains are another story since the filesystem is virtualised) - but I came across an interesting issue a couple of days ago where this code simply doesn't work: the nUnit test runner. This uses both Shadow Copying (so my algorithm would need to be discovering and loading them from the shadow-copy drop folder, not from the bin folder) and it sets up the PrivateBinPath as being relative to the base directory. And of course there are loads of other hosting scenarios that I probably haven't considered; but which must be valid because otherwise Fusion would choke on loading the assemblies. I want to stop feeling around and introducing hack upon hack to accommodate these new scenarios as they crop up - what I want is, given an AppDomain and its setup information, the ability to produce this list of Folders that I should scan in order to pick up all the DLLs that are going to be loaded; regardless of how the AppDomain is setup. If Fusion can see them as all the same, then so should my code. Of course, I might have to alter the algorithm if .Net changes its internals - that's just a cross I'll have to bear. Equally, I'm happy to consider SQL Server and any other similar environments as edge-cases that remain unsupported for now. Any ideas!?

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  • How do you automap List<float> or float[] with Fluent NHibernate?

    - by Tom Bushell
    Having successfully gotten a sample program working, I'm now starting to do Real Work with Fluent NHibernate - trying to use Automapping on my project's class heirarchy. It's a scientific instrumentation application, and the classes I'm mapping have several properties that are arrays of floats e.g. private float[] _rawY; public virtual float[] RawY { get { return _rawY; } set { _rawY = value; } } These arrays can contain a maximum of 500 values. I didn't expect Automapping to work on arrays, but tried it anyway, with some success at first. Each array was auto mapped to a BLOB (using SQLite), which seemed like a viable solution. The first problem came when I tried to call SaveOrUpdate on the objects containing the arrays - I got "No persister for float[]" exceptions. So my next thought was to convert all my arrays into ILists e.g. public virtual IList<float> RawY { get; set; } But now I get: NHibernate.MappingException: Association references unmapped class: System.Single Since Automapping can deal with lists of complex objects, it never occured to me it would not be able to map lists of basic types. But after doing some Googling for a solution, this seems to be the case. Some people seem to have solved the problem, but the sample code I saw requires more knowledge of NHibernate than I have right now - I didn't understand it. Questions: 1. How can I make this work with Automapping? 2. Also, is it better to use arrays or lists for this application? I can modify my app to use either if necessary (though I prefer lists). Edit: I've studied the code in Mapping Collection of Strings, and I see there is test code in the source that sets up an IList of strings, e.g. public virtual IList<string> ListOfSimpleChildren { get; set; } [Test] public void CanSetAsElement() { new MappingTester<OneToManyTarget>() .ForMapping(m => m.HasMany(x => x.ListOfSimpleChildren).Element("columnName")) .Element("class/bag/element").Exists(); } so this must be possible using pure Automapping, but I've had zero luck getting anything to work, probably because I don't have the requisite knowlege of manually mapping with NHibernate. Starting to think I'm going to have to hack this (by encoding the array of floats as a single string, or creating a class that contains a single float which I then aggregate into my lists), unless someone can tell me how to do it properly. End Edit Here's my CreateSessionFactory method, if that helps formulate a reply... private static ISessionFactory CreateSessionFactory() { ISessionFactory sessionFactory = null; const string autoMapExportDir = "AutoMapExport"; if( !Directory.Exists(autoMapExportDir) ) Directory.CreateDirectory(autoMapExportDir); try { var autoPersistenceModel = AutoMap.AssemblyOf<DlsAppOverlordExportRunData>() .Where(t => t.Namespace == "DlsAppAutomapped") .Conventions.Add( DefaultCascade.All() ) ; sessionFactory = Fluently.Configure() .Database(SQLiteConfiguration.Standard .UsingFile(DbFile) .ShowSql() ) .Mappings(m => m.AutoMappings.Add(autoPersistenceModel) .ExportTo(autoMapExportDir) ) .ExposeConfiguration(BuildSchema) .BuildSessionFactory() ; } catch (Exception e) { Debug.WriteLine(e); } return sessionFactory; }

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  • JBoss 5.1 binds to host address while run in vserver with -b <guest address>

    - by bart cane
    Hello, while starting JBoss 5.1.0.GA in virtual server machine on Debian (linux-VServer technology) I get the following error: ERROR [org.jboss.kernel.plugins.dependency.AbstractKernelController] (main) Error installing to Start: name=jboss.remoting:protocol=rmi,service=JMXConnectorServer state=Create mode=Manual requiredState=Installed java.io.IOException: Cannot bind to URL [rmi://10.1.2.11:1090/jmxconnector]: javax.naming.NoPermissionException [Root exception is java.rmi.ServerException: RemoteException occurred in server thread; nested exception is: java.rmi.AccessException: Registry.Registry.bind disallowed; origin /AA.BB.CC.DD is non-local host] where AA.BB.CC.DD is host machine name, 10.1.2.11 is vserver guest with JBoss and JBoss is started with -b 10.1.2.11 (I also tried -Djboss.bind.address=10.1.2.11 - the same result). 10.1.2.11 is bound to dummy2 interface on host (serving 10.1.2.1 network). The root exception is strange - why JBoss wants to bind to host address AA.BB.CC.DD? There were no problems with 4.2.3.GA on the same machine, also started with -b 10.1.2.11. It starts correctly when no params present - binds to localhost and everything is ok, but it MUST be bound to 10.1.2.11 to be visible by Apache on another vserver guest, acting as proxy. I thought that it can be fixed by setting net.ipv4.conf.all.promote_secondaries=1 via sysctl (was 0) but it didn't help much. Has anyone had such problem? Regards, bart

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  • Android: Nexus One - Geocoder causes IOException - works perfectly with other devices and emulator

    - by Stefan Klumpp
    The code below works perfectly for real devices running on 1.5, 1.6 and 2.0 as well as the emulator running on 2.1. However, executing it on the Nexus One (running 2.1) raises an IOException: java.io.IOException: Unable to parse response from server at android.location.Geocoder.getFromLocation(Geocoder.java:124) That's the code snippet where it happens: Double myLatitude = AppObject.myLocation.getLatitude(); Double myLongitude = AppObject.myLocation.getLongitude(); DEBUG.i(TAG, "My location: " + myLatitude + " | " + myLongitude); Geocoder geocoder = new Geocoder(MainActivity.this); java.util.List<Address> addressList; try { addressList = geocoder.getFromLocation(myLatitude, myLongitude, 5); if(addressList!=null && addressList.size()>0) { currentAddress = new String(); DEBUG.i(TAG,addressList.get(0).toString()); currentAddress = addressList.get(0).getAddressLine(0) + ", " + addressList.get(0).getAddressLine(1) + ", " + addressList.get(0).getAddressLine(2); } return true; } catch (IOException e) { e.printStackTrace(); return false; }

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  • An error has occurred opening extern DTD (w3.org, xhtml1-transitional.dtd). 503 Server Unavailable

    - by Cheeso
    I'm trying to do xpath queries over an xhtml document. The document looks like this: <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html lang="en" xmlns="http://www.w3.org/1999/xhtml" xml:lang="en"> <head> .... </head> <body> ... </body> </html> Because the document includes various char entities (&nbsp; and so on), I need to use the DTD, in order to load it with an XmlReader. So my code looks like this: var reader = XmlReader.Create(sr, new XmlReaderSettings { ProhibitDtd = false }); But when I run this, it returns An error has occurred while opening external DTD 'http://www.w3.org/TR/xhtml1-transitional.dtd': The remote server returned an error: (503) Server Unavailable. Now, I know why I am getting the 503 error. W3C explained it very clearly. But I still want to validate the document. How can I validate with the DTD, and get the entity definitions, without hitting the w3.org website? related: - java.io.IOException: Server returned HTTP response code: 503

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  • How to deploy on a remote machine using hudson's WAS Builder Plugin?

    - by Peter Schuetze
    I have a hudson build server (Windows) that does not have Websphere installed. I created a Hudson node that I connect to via SSH. I also installed the WAS Builder Plugin to run jython scripts on the AIX machine. The job that uses the WAS Builder Plugin is tied to the AIX box. I run into errors. Does anybody know, whether that setup might work or if a different setup will work for the WAS Builder Plugin? EDIT: I get following Error Message: [test] $ cmd /c call /tmp/hudson9035964108103168395.bat FATAL: command execution failed java.io.IOException: cmd: not found at java.lang.UNIXProcess.fullPath(UNIXProcess.java:372) at java.lang.UNIXProcess.<init>(UNIXProcess.java:178) at java.lang.ProcessImpl.start(ProcessImpl.java:114) at java.lang.ProcessBuilder.start(ProcessBuilder.java:466) at hudson.Proc$LocalProc.<init>(Proc.java:149) at hudson.Proc$LocalProc.<init>(Proc.java:121) at hudson.Launcher$LocalLauncher.launch(Launcher.java:633) at hudson.Launcher$ProcStarter.start(Launcher.java:268) at hudson.Launcher$RemoteLaunchCallable.call(Launcher.java:778) at hudson.Launcher$RemoteLaunchCallable.call(Launcher.java:754) at hudson.remoting.UserRequest.perform(UserRequest.java:114) at hudson.remoting.UserRequest.perform(UserRequest.java:48) at hudson.remoting.Request$2.run(Request.java:270) at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:432) at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:284) at java.util.concurrent.FutureTask.run(FutureTask.java:138) at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:665) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:690) at java.lang.Thread.run(Thread.java:810) Finished: FAILURE I am wondering whether that plugin can be executed on a slave, especially in my case where the master is on Windows and the slave on AIX.

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  • Xcode newb -- #include can't find my file

    - by morgancodes
    I'm trying to get a third party audio library (STK) working inside Xcode. Along with the standard .h files, many of the implementation files include a file called SKINI.msg. SKINI.msg is in the same directory as all of the header files. The header files are getting included fine, but the compiler complains that it can't find SKINI.msg. What do I need to do to get Xcode to happily include SKINI.msg? Edit: Here's the contents of SKINI.msg: /*********************************************************/ /* Definition of SKINI Message Types and Special Symbols Synthesis toolKit Instrument Network Interface These symbols should have the form: \c __SK_<name>_ where <name> is the string used in the SKINI stream. by Perry R. Cook, 1995 - 2010. */ /*********************************************************/ namespace stk { #define NOPE -32767 #define YEP 1 #define SK_DBL -32766 #define SK_INT -32765 #define SK_STR -32764 #define __SK_Exit_ 999 /***** MIDI COMPATIBLE MESSAGES *****/ /*** (Status bytes for channel=0) ***/ #define __SK_NoteOff_ 128 #define __SK_NoteOn_ 144 #define __SK_PolyPressure_ 160 #define __SK_ControlChange_ 176 #define __SK_ProgramChange_ 192 #define __SK_AfterTouch_ 208 #define __SK_ChannelPressure_ __SK_AfterTouch_ #define __SK_PitchWheel_ 224 #define __SK_PitchBend_ __SK_PitchWheel_ #define __SK_PitchChange_ 49 #define __SK_Clock_ 248 #define __SK_SongStart_ 250 #define __SK_Continue_ 251 #define __SK_SongStop_ 252 #define __SK_ActiveSensing_ 254 #define __SK_SystemReset_ 255 #define __SK_Volume_ 7 #define __SK_ModWheel_ 1 #define __SK_Modulation_ __SK_ModWheel_ #define __SK_Breath_ 2 #define __SK_FootControl_ 4 #define __SK_Portamento_ 65 #define __SK_Balance_ 8 #define __SK_Pan_ 10 #define __SK_Sustain_ 64 #define __SK_Damper_ __SK_Sustain_ #define __SK_Expression_ 11 #define __SK_AfterTouch_Cont_ 128 #define __SK_ModFrequency_ __SK_Expression_ #define __SK_ProphesyRibbon_ 16 #define __SK_ProphesyWheelUp_ 2 #define __SK_ProphesyWheelDown_ 3 #define __SK_ProphesyPedal_ 18 #define __SK_ProphesyKnob1_ 21 #define __SK_ProphesyKnob2_ 22 /*** Instrument Family Specific ***/ #define __SK_NoiseLevel_ __SK_FootControl_ #define __SK_PickPosition_ __SK_FootControl_ #define __SK_StringDamping_ __SK_Expression_ #define __SK_StringDetune_ __SK_ModWheel_ #define __SK_BodySize_ __SK_Breath_ #define __SK_BowPressure_ __SK_Breath_ #define __SK_BowPosition_ __SK_PickPosition_ #define __SK_BowBeta_ __SK_BowPosition_ #define __SK_ReedStiffness_ __SK_Breath_ #define __SK_ReedRestPos_ __SK_FootControl_ #define __SK_FluteEmbouchure_ __SK_Breath_ #define __SK_JetDelay_ __SK_FluteEmbouchure_ #define __SK_LipTension_ __SK_Breath_ #define __SK_SlideLength_ __SK_FootControl_ #define __SK_StrikePosition_ __SK_PickPosition_ #define __SK_StickHardness_ __SK_Breath_ #define __SK_TrillDepth_ 1051 #define __SK_TrillSpeed_ 1052 #define __SK_StrumSpeed_ __SK_TrillSpeed_ #define __SK_RollSpeed_ __SK_TrillSpeed_ #define __SK_FilterQ_ __SK_Breath_ #define __SK_FilterFreq_ 1062 #define __SK_FilterSweepRate_ __SK_FootControl_ #define __SK_ShakerInst_ 1071 #define __SK_ShakerEnergy_ __SK_Breath_ #define __SK_ShakerDamping_ __SK_ModFrequency_ #define __SK_ShakerNumObjects_ __SK_FootControl_ #define __SK_Strumming_ 1090 #define __SK_NotStrumming_ 1091 #define __SK_Trilling_ 1092 #define __SK_NotTrilling_ 1093 #define __SK_Rolling_ __SK_Strumming_ #define __SK_NotRolling_ __SK_NotStrumming_ #define __SK_PlayerSkill_ 2001 #define __SK_Chord_ 2002 #define __SK_ChordOff_ 2003 #define __SK_SINGER_FilePath_ 3000 #define __SK_SINGER_Frequency_ 3001 #define __SK_SINGER_NoteName_ 3002 #define __SK_SINGER_Shape_ 3003 #define __SK_SINGER_Glot_ 3004 #define __SK_SINGER_VoicedUnVoiced_ 3005 #define __SK_SINGER_Synthesize_ 3006 #define __SK_SINGER_Silence_ 3007 #define __SK_SINGER_VibratoAmt_ __SK_ModWheel_ #define __SK_SINGER_RndVibAmt_ 3008 #define __SK_SINGER_VibFreq_ __SK_Expression_ } // stk namespace And here's what the compiler said: CompileC build/StkCompile.build/Debug-iphonesimulator/StkCompile.build/Objects-normal/i386/BandedWG.o "../../../Data/study/iPhone class/stk-4.4.2/src/BandedWG.cpp" normal i386 c++ com.apple.compilers.gcc.4_2 cd /Users/morganpackard/Desktop/trashme/StkCompile setenv LANG en_US.US-ASCII setenv PATH "/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin:/Developer/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin" /Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin/gcc-4.2 -x c++ -arch i386 -fmessage-length=0 -pipe -Wno-trigraphs -fpascal-strings -fasm-blocks -O0 -Wreturn-type -Wunused-variable -D__IPHONE_OS_VERSION_MIN_REQUIRED=30000 -isysroot /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator3.1.2.sdk -fvisibility=hidden -fvisibility-inlines-hidden -mmacosx-version-min=10.5 -gdwarf-2 -iquote /Users/morganpackard/Desktop/trashme/StkCompile/build/StkCompile.build/Debug-iphonesimulator/StkCompile.build/StkCompile-generated-files.hmap -I/Users/morganpackard/Desktop/trashme/StkCompile/build/StkCompile.build/Debug-iphonesimulator/StkCompile.build/StkCompile-own-target-headers.hmap -I/Users/morganpackard/Desktop/trashme/StkCompile/build/StkCompile.build/Debug-iphonesimulator/StkCompile.build/StkCompile-all-target-headers.hmap -iquote /Users/morganpackard/Desktop/trashme/StkCompile/build/StkCompile.build/Debug-iphonesimulator/StkCompile.build/StkCompile-project-headers.hmap -F/Users/morganpackard/Desktop/trashme/StkCompile/build/Debug-iphonesimulator -I/Users/morganpackard/Desktop/trashme/StkCompile/build/Debug-iphonesimulator/include -I/Users/morganpackard/Desktop/trashme/StkCompile/build/StkCompile.build/Debug-iphonesimulator/StkCompile.build/DerivedSources/i386 -I/Users/morganpackard/Desktop/trashme/StkCompile/build/StkCompile.build/Debug-iphonesimulator/StkCompile.build/DerivedSources -include /var/folders/dx/dxSUSyOJFv0MBEh9qC1oJ++++TI/-Caches-/com.apple.Xcode.501/SharedPrecompiledHeaders/StkCompile_Prefix-bopqzvwpuyqltrdumgtjtfrjvtzb/StkCompile_Prefix.pch -c "/Users/morganpackard/Desktop/trashme/StkCompile/../../../Data/study/iPhone class/stk-4.4.2/src/BandedWG.cpp" -o /Users/morganpackard/Desktop/trashme/StkCompile/build/StkCompile.build/Debug-iphonesimulator/StkCompile.build/Objects-normal/i386/BandedWG.o /Users/morganpackard/Desktop/trashme/StkCompile/../../../Data/study/iPhone class/stk-4.4.2/src/BandedWG.cpp:33:21: error: SKINI.msg: No such file or directory /Users/morganpackard/Desktop/trashme/StkCompile/../../../Data/study/iPhone class/stk-4.4.2/src/BandedWG.cpp: In member function 'virtual void stk::BandedWG::controlChange(int, stk::StkFloat)': /Users/morganpackard/Desktop/trashme/StkCompile/../../../Data/study/iPhone class/stk-4.4.2/src/BandedWG.cpp:326: error: '__SK_BowPressure_' was not declared in this scope /Users/morganpackard/Desktop/trashme/StkCompile/../../../Data/study/iPhone class/stk-4.4.2/src/BandedWG.cpp:342: error: '__SK_AfterTouch_Cont_' was not declared in this scope /Users/morganpackard/Desktop/trashme/StkCompile/../../../Data/study/iPhone class/stk-4.4.2/src/BandedWG.cpp:349: error: '__SK_ModWheel_' was not declared in this scope /Users/morganpackard/Desktop/trashme/StkCompile/../../../Data/study/iPhone class/stk-4.4.2/src/BandedWG.cpp:357: error: '__SK_ModFrequency_' was not declared in this scope /Users/morganpackard/Desktop/trashme/StkCompile/../../../Data/study/iPhone class/stk-4.4.2/src/BandedWG.cpp:359: error: '__SK_Sustain_' was not declared in this scope /Users/morganpackard/Desktop/trashme/StkCompile/../../../Data/study/iPhone class/stk-4.4.2/src/BandedWG.cpp:363: error: '__SK_Portamento_' was not declared in this scope /Users/morganpackard/Desktop/trashme/StkCompile/../../../Data/study/iPhone class/stk-4.4.2/src/BandedWG.cpp:367: error: '__SK_ProphesyRibbon_' was not declared in this scope

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  • Creating a shim Stream

    - by spender
    A decompression API that I am using has the following API: Decode(Stream inStream,Stream outStream) I'd like to create a wrapper around this API, such that I can create my own Stream class which offers up the decoded data. Stream decodedStream=new BlaDecodeStream(inStream); So that I can than use this stream as a parameter to the XmlReader constructor in the same way one might use the System.IO.Compression.GZipStream. As far as I can tell, the only other option is set outStream stream to a MemoryStream or to a FileStream and go in two hops. The files I am dealing with are enormous, so neither of these options are particularly attractive. Before I go reinventing the wheel, is there any prior art that I might be able to draw from, or something in the BCL I might have missed? The CircularStream implementation here would go some of the way to helping, but I'm really looking for something similar that would block (as opposed to over/underrun) when the Stream's internal buffer is 'empty' when reading from it and block when the internal buffer is full when writing to it. In this way it could serve as parameter outStream and simultaneously (i.e. from another thread) could be read from by the XmlReader.

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  • C# serialPort speed

    - by MarekK
    Hi I am developing some monitoring tool for some kind of protocol based on serial communication. Serial BaudRate=187,5kb I use System.IO.Ports.SerialPort class. This protocol has 4 kinds of frames. They have 1Byte,3Bytes,6Bytes, 10-255Bytes. I can work with them but I receive them too late to respond. For the beginning I receive first packed after ex. 96ms (too late), and it contains about 1000B. This means 20-50 frames (too much, too late). Later its work more stable, 3-10Bytes but it is still too late because it contains 1-2 frames. Of Course 1 frame is OK, but 2 is too late. Can you point me how can I deal with it more reliable? I know it is possible. Revision1: I tried straight way: private void serialPort1_DataReceived(object sender, SerialDataReceivedEventArgs e) { if (!serialPort1.IsOpen) return; this.BeginInvoke(new EventHandler(this.DataReceived)); } And Backgroud worker: And ... new Tread(Read) and... always the same. Too late, too slow. Do I have to go back to WinApi and import some kernel32.dll functions? Revision 2: this is the part of code use in the Treading way: int c = serialPort1.BytesToRead; byte[] b = new byte[c]; serialPort1.Read(b, 0, c); I guess it is some problem with stream use inside SerialPort class. Or some synchronization problem. Revision 3: I do not use both at once!! I just tried different ways. Regards MarekK

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  • What does SQL Server's BACKUPIO wait type mean?

    - by solublefish
    I'm using Sql Server 2008 ("R1"), with some maintenance plans that back up my databases to a network share. Some of my backup jobs show long waits of type "BACKUPIO". Of course it seems like this is an I/O subsystem limitation, but I'm skeptical. Perfmon stats for I/O on the production (source) server are well within normal trends for that server. The destination server shows a sustained 7MB/s write rate, which seems incredibly low, even for a slow disk. The network link is gigabit ethernet and nowhere near saturated. The few docs I've turned up about BACKUPIO indicate that it's not specifically a wait on I/O, surprisingly enough. This MSFT doc says it's abnormal unless you're using a tape drive, which I'm not. But it doesn't say (or I don't understand) exactly what resource is missing. http://www.docstoc.com/docs/24580659/Performance-Tuning-in-SQL-Server-2005 And this piece says it's not related to I/O performance at all. http://www.informit.com/articles/article.aspx?p=686168&seqNum=5 "Note that BACKUPIO and IO_AUDIT_MUTEX are not related to IO performance." Anyway, does anyone know what BACKUPIO actually means and/or what I can do to diagnose or eliminate it?

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  • Python bindings for a vala library

    - by celil
    I am trying to create python bindings to a vala library using the following IBM tutorial as a reference. My initial directory has the following two files: test.vala using GLib; namespace Test { public class Test : Object { public int sum(int x, int y) { return x + y; } } } test.override %% headers #include <Python.h> #include "pygobject.h" #include "test.h" %% modulename test %% import gobject.GObject as PyGObject_Type %% ignore-glob *_get_type %% and try to build the python module source test_wrap.c using the following code build.sh #/usr/bin/env bash valac test.vala -CH test.h python /usr/share/pygobject/2.0/codegen/h2def.py test.h > test.defs pygobject-codegen-2.0 -o test.override -p test test.defs > test_wrap.c However, the last command fails with an error $ ./build.sh Traceback (most recent call last): File "/usr/share/pygobject/2.0/codegen/codegen.py", line 1720, in <module> sys.exit(main(sys.argv)) File "/usr/share/pygobject/2.0/codegen/codegen.py", line 1672, in main o = override.Overrides(arg) File "/usr/share/pygobject/2.0/codegen/override.py", line 52, in __init__ self.handle_file(filename) File "/usr/share/pygobject/2.0/codegen/override.py", line 84, in handle_file self.__parse_override(buf, startline, filename) File "/usr/share/pygobject/2.0/codegen/override.py", line 96, in __parse_override command = words[0] IndexError: list index out of range Is this a bug in pygobject, or is something wrong with my setup? What is the best way to call code written in vala from python? EDIT: Removing the extra line fixed the current problem, but now as I proceed to build the python module, I am facing another problem. Adding the following C file to the existing two in the directory: test_module.c #include <Python.h> void test_register_classes (PyObject *d); extern PyMethodDef test_functions[]; DL_EXPORT(void) inittest(void) { PyObject *m, *d; init_pygobject(); m = Py_InitModule("test", test_functions); d = PyModule_GetDict(m); test_register_classes(d); if (PyErr_Occurred ()) { Py_FatalError ("can't initialise module test"); } } and building with the following script build.sh #/usr/bin/env bash valac test.vala -CH test.h python /usr/share/pygobject/2.0/codegen/h2def.py test.h > test.defs pygobject-codegen-2.0 -o test.override -p test test.defs > test_wrap.c CFLAGS="`pkg-config --cflags pygobject-2.0` -I/usr/include/python2.6/ -I." LDFLAGS="`pkg-config --libs pygobject-2.0`" gcc $CFLAGS -fPIC -c test.c gcc $CFLAGS -fPIC -c test_wrap.c gcc $CFLAGS -fPIC -c test_module.c gcc $LDFLAGS -shared test.o test_wrap.o test_module.o -o test.so python -c 'import test; exit()' results in an error: $ ./build.sh ***INFO*** The coverage of global functions is 100.00% (1/1) ***INFO*** The coverage of methods is 100.00% (1/1) ***INFO*** There are no declared virtual proxies. ***INFO*** There are no declared virtual accessors. ***INFO*** There are no declared interface proxies. Traceback (most recent call last): File "<string>", line 1, in <module> ImportError: ./test.so: undefined symbol: init_pygobject Where is the init_pygobject symbol defined? What have I missed linking to?

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