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  • Problems using wxWidgets (wxMSW) within multiple DLL instances

    Preface I'm developing VST-plugins which are DLL-based software modules and loaded by VST-supporting host applications. To open a VST-plugin the host applications loads the VST-DLL and calls an appropriate function of the plugin while providing a native window handle, which the plugin can use to draw it's GUI. I managed to port my original VSTGUI code to the wxWidgets-Framework and now all my plugins run under wxMSW and wxMac but I still have problems under wxMSW to find a correct way to open and close the plugins and I am not sure if this is a wxMSW-only issue. Problem If I use any VST-host application I can open and close multiple instances of one of my VST-plugins without any problems. As soon as I open another of my VST-plugins besides my first VST-plugin and then close all instances of my first VST-plugin the application crashes after a short amount of time within the wxEventHandlerr::ProcessEvent function telling me that the wxTheApp object isn't valid any longer during execution of wxTheApp-FilterEvent (see below). So it seems to be that the wxTheApp objects was deleted after closing all instances of the first plugin and is no longer available for the second plugin. bool wxEvtHandler::ProcessEvent(wxEvent& event) { // allow the application to hook into event processing if ( wxTheApp ) { int rc = wxTheApp->FilterEvent(event); if ( rc != -1 ) { wxASSERT_MSG( rc == 1 || rc == 0, _T("unexpected wxApp::FilterEvent return value") ); return rc != 0; } //else: proceed normally } .... } Preconditions 1.) All my VST-plugins a dynamically linked against the C-Runtime and wxWidgets libraries. With regard to the wxWidgets forum this seemed to be the best way to run multiple instances of the software side by side. 2.) The DllMain of each VST-Plugin is defined as follows: // WXW #include "wx/app.h" #include "wx/defs.h" #include "wx/gdicmn.h" #include "wx/image.h" #ifdef __WXMSW__ #include <windows.h> #include "wx/msw/winundef.h" BOOL APIENTRY DllMain ( HANDLE hModule, DWORD ul_reason_for_call, LPVOID lpReserved ) { switch (ul_reason_for_call) { case DLL_PROCESS_ATTACH: { wxInitialize(); ::wxInitAllImageHandlers(); break; } case DLL_THREAD_ATTACH: break; case DLL_THREAD_DETACH: break; case DLL_PROCESS_DETACH: wxUninitialize(); break; } return TRUE; } #endif // __WXMSW__ class Application : public wxApp {}; IMPLEMENT_APP_NO_MAIN(Application) Question How can I prevent this behavior respectively how can I properly handle the wxTheApp object if I have multiple instances of different VST-plugins (DLL-modules), which are dynamically linked against the C-Runtime and wxWidgets libraries? Best reagards, Steffen

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  • URL routing documentation question.

    - by James Evans
    I'm reading about URL routing at How to: Define Routes for Web Forms Applications and there's something in the example I don't understand. If you look at the example provided below, routes.MapPageRoute("", "SalesReport/{locale}/{year}/{*queryvalues}", "~/sales.aspx"); specifically at "SalesReport/{locale}/{year}/{*queryvalues}" Why does queryvalues have an asterisk in front of it and locale and year don't?

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  • Change ClickOnce Publish Folder Location

    - by LnDCobra
    How can I change the Publishing Folder of already deployed applications? E.G. Currently the path is \\Server1\App but I want to change this to \\Server2\App For performance reasons (Server1 is becoming overloaded) and therefore I'm planning to move majority of our shared folders including the Apps folder to a different server

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  • Free visual editor for a language that would compile to native windows exe

    - by luvieere
    I'm looking for a free visual editor for a language that would compile to native windows exe, no runtime. I'm looking for alternatives to the Delphi suite (so don't give it as an answer), something that would allow me to write Windows GUI applications with ease. I don't care about the language, as long as it gets the job done, but I would appreciate if your suggestions avoid functional languages. Even better if it abstracts the windowing system with something more simple than the winAPI.

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  • safari 5 resize flash application

    - by dome
    Just notice that after updating to Safari 5 (mac) all the flash applications that respond to resize events got sluggish. try: http://www.tutorio.com/media/flash/liquid-demo.html this works great with firefox 3.6.3, Chrome can deal with it fine, although not so fast as Firefox, but new Safari gives a awful experience, distorting all content if you do fast resizing. Any ideas why is this happening / and how can I get a better performance with safari browsers?

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  • Integrating Apache Shiro with ASP.NET MVC

    - by Garry Shutler
    I'm looking at using Apache Shiro as a central authentication service for all our applications over a variety of platforms. It's hinted at that it can integrate with a variety of platforms which would be ideal for my purposes but I cannot find any examples of how this is achieved from .NET (ASP.NET MVC specifically if it makes any difference). Does anyone know where I can find an example of how to do this?

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  • Which CouchDB API to use for Rails?

    - by Matt Baker
    I am currently investigating possible applications of CouchDB on my current project (written in Rails) and would like to get some feedback from people who have actually used these APIs. Which would you recommend and why? ActiveCouch CouchFoo CouchRest CouchRest-Rails CouchPotato

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  • What does "render @collection" do?

    - by ryeguy
    I'm trying to learn Rails better by looking at example applications, and while looking at this line of the source of railscasts.com, I noticed it does this: <div class="episodes"> <%= render @episodes %> </div> What exactly is going on here? Why isn't this documented on the render function? Or is it?

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  • Get calling user ID in PHP setuid script

    - by Bart van Heukelom
    I have a PHP script on Linux in which the sticky bit is set, so it gets executed as the file owner. How can I get the user id of the calling process, for authorization purposes? Context: I have two applications on a server, and want one to request some info from the other. For this reason the other offers a script with setuid, but I want to make sure it can only be called by the one.

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  • Using excel as UI without VB

    - by 01
    I think every business person would like to have excel UI, however they are forced into using web applications that sometimes look like really bad excel. Are there any frameworks that help build excel ui without VB? I dont mean framework like POI or JExcel that allows you to generate excel reports.

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  • programming from a usb stick, .net

    - by dean nolan
    I was wondering if there was a way I could program and compile .net applications (c#, asp.net mvc) from a usb stick on any laptop I plugged in. I am lookinjg for a solution that does not have me installing programs on the laptop, so I have to be able to run an ide or editor from an exe and compile presumably from command line. Was also wondering if I can run MS test projects from command line to check tests passed etc. Thanks

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  • Peformance of f#

    - by Casebash
    What is the performance of f# like in terms of both memory and speed? I am particularly interested in your thoughts about what real world applications are viable. Benchmarks would be particularly relevant.

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  • Using MySQL in Pydev Eclipse

    - by Hossein
    Hi, I am trying to access a MySQL database with python through Pydev Eclipse. I have installed the necessary files to access MysQL from python and I can access the database only when I write code in Python IDLE environment and run it from command prompt. However I am not able to run my applications from Pydev. when I use this "import MysqlDB" i get an error, but in IDLE no errors and my code runs very smoothly. Does anyone know were the problem is? Thanks

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  • Cocoa: Hide one application

    - by Craig
    Is it possible to hide one specific application using cocoa? I know you can hide all other applications using the following code [[NSWorkspace sharedWorkspace] performSelectorOnMainThread:@selector(hideOtherApplications) withObject:NULL waitUntilDone:NO]; But is it possible to hide just one specific application say Safari for example?

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