Failed to load platform plugin "windows". Available Platform are : error [solved]



  • I'm creating Qt project with Visual studio 2012 and Qt5 SDK using Visual studio Qt addOn .
    I have created QApplication Project which basically uses
    qtmain.lib
    Qt5Core.lib
    Qt5Gui.lib
    Qt5Network.lib
    Ws2_32.lib
    Winhttp.lib
    Winmm.lib
    Qt5Widgets.lib
    Qt5PlatformSupport.lib
    imm32.lib

    and i was able to build the binary .

    i'm trying to run this application on windows 7 desktop. having following dlls

    icudt51.dll
    icuin51.dll
    icuuc51.dll
    libEGL.dll
    libGLESv2.dll
    Qt5Core.dll
    Qt5Network.dll
    Qt5GUI.dll
    Qt5Widgets.dll
    qwindows.dll [copied from msvc2012\plugins\platform folder ]

    I'm getting Failed to load platform plugin "windows". Available Platform are : while trying to run the application .

    What would i have missed ? How to make it run on windows platform ?
    Please Help me to troubleshoot this :(


  • Moderators

    where di you put the qwindows.dll file? It needs to remain in plugins\platform (relative to your application binary)!



  • followed as u said. but still its giving same errors.


  • Moderators

    you should read my post again:
    [quote author="raven-worx" date="1372426741"]
    It needs to remain in plugins\platform (relative to your application binary)![/quote]
    --> plugins\platform\qwindows.dll


  • Moderators

    [quote author="Raveendra" date="1372426402"]
    qwindows.dll [copied from msvc2012\plugins\platform folder ]
    [/quote]
    where is this "msvc2012" folder?! The platform DLLs should be located in <qt-dir>/qtbase/plugins/platforms


  • Lifetime Qt Champion

    There's also the "deployment guide":http://qt-project.org/doc/qt-5.0/qtdoc/deployment-windows.html to help you with that



  • I've installed Qt5.1.0 SDK for MSVC12-32bit RC on my development computer. I'm not finding qtbase folder within <qt-dir>


  • Lifetime Qt Champion

    search for the plugins/platforms folder which should be next to bin, doc etc...



  • i found plugins/platform folder under msvc2012 folder


  • Moderators

    [quote author="Raveendra" date="1372429653"] I'm not finding qtbase folder within <qt-dir>[/quote]
    yes..sorry my fault. i only use the source version of Qt not the pre-compiled packages. You're right.



  • i have set the environment variable

    QT_QPA_PLATFORM_PLUGIN_PATH = C:\Qt\Qt5.1.0\5.1.0-rc1\msvc2012\plugins\platforms

    i meant path to qtwindows.dll

    this solved my problem and exe is running fine now :)



  • If anyone still struggling w this, see posting
    http://qt-project.org/forums/viewthread/21269


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