Qt Platform Plugin Windows

Qt Platform Plugin Windows 3,2/5 3007 votes

As the title suggests, I am having issues deploying an application built with Qt 5.3. The install procedure that worked with 5.1 does not work anymore. I followed 'this': guide which led me here. I literally have the entirety of my Qt distribution in the deployment directory on my test machine (free of any Qt installations). This means I have all dlls from./bin, everything from plugins, and everything from qml. The deployment folder screenshot can be found 'here'. Additional details: I'm using Qt 5.3 with MS VS2013 x64 with OpenGL all running on Win 7 x64 on my dev machine.

Windows

1 million software developers love Qt because they can build powerful cross-platform applications - modular C++ class library, declarative design & pro IDE. Kryak dlya tmaker.

The deployment machine is also Win 7 x64. Don't worry I wrote another 'blog post'::-) So, a small bare-bones works fine, but your real app does not. Try turn on plugin loading trace: (quoting my post): in the Projects mode page, at the bottom, add the environment variable QT_DEBUG_PLUGINS by clicking Details in Build Environment. Set the value to 1.

Then Run your project again, and look in Application Output window, you’ll see lines like “QFactoryLoader::QFactoryLoader() checking.” Also, are you doing any voodoo before QApplication app(argc, argv); in main.cpp? QT_DEBUG_PLUGINS=1, yeah I also seen that it's not working on the command line (only in QtCreator, which is kind of pointless. Been meaning to check why, if I find why I'll update my blog post). LibEGL.dll, correct, not needed.

Anyway, the tool that could help 'ListDLLs': Launch it from cmd line and add your.exe file name as argument (you only a few of the first chars). Then install it on the deployment machine as well, and run it while your app hangs on that error box ('could not find or load the Qt platform plugin'). Now compare them.

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EDIT: also 'Dependency Walker': is a good tool, install on both machines, do File Open your.exe, then Profile, Start Profiling.