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POQt GUI environment in a DLL (VST Plugin)
 

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    <p>I would like to use the Qt GUI library as the user interface for a VST plugin. A VST plugin is a DLL on windows. A host application calls various functions on the DLL, including things like <code>openGUI()</code>.</p> <p>I want to know how to use Qt GUI from a DLL; I have done some research to look at the possible options but I'm not completely sure on the limitations.</p> <p>The main problem is where to create the <code>QApplication</code> object and call <code>exec()</code> on it (which is a function that does not return until the application has quit).</p> <p>I have looked at the solution given in <a href="https://stackoverflow.com/questions/11054087/starting-qt-gui-from-dll-in-dllstart-function">this post</a>, but after further reading it would appear this solution will not work on Mac OS X, as Cocoa is more restrictive about the particular thread a GUI can run on. It's a bit of a hack really.</p> <p>I have also seen <a href="https://stackoverflow.com/questions/1678937/dllmain-and-qt-mfc-migration">this solution</a>, but that relies on <code>QMfcApp</code> and <code>QWinWindow</code> which don't appear to be part of the Qt library any more.</p> <p>Is the only way round this for my DLL to spawn off a new application itself? Presumably I could start one with a call to <code>QProcess</code> and use some shared memory to share between the GUI application and my VST DLL? Has anyone come across this type of problem? Am I going down a bad route with this or is there something I haven't thought of yet?</p> <p><strong>Update</strong></p> <p>After further research I have come across the <a href="http://qt-project.org/doc/qt-4.8/qabstracteventdispatcher.html" rel="nofollow noreferrer"><code>QAbstractEventDispatcher</code></a> class. I have seen <a href="http://qt-project.org/doc/qt-4.8/qabstracteventdispatcher.html" rel="nofollow noreferrer">this post</a> which seems to say it's possible to call <code>QApplication::processEvents()</code> from your own (the host of my plugin) event loop instead of calling <code>QApplication::exec()</code>. Has anyone tried doing this?</p>
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    1. COI've done it on windows (the first solution with the seperate thread). It was really difficult since we needed to fire up a seperate thread from dllmain somthing that is prohibited. QMfcApp has never been part of Qt but rather a so called "solution". You find it here http://qt.gitorious.org/qt-solutions/qt-solutions/trees/master/qtwinmigrate. Good luck!
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