Windows QT Deployment not working (VS2010 + QT 5.4.0)

  • I have:
    Windows 7 64bit
    Visual Studio 2010
    QT 5.4.0_MSVC2010OpenGL_32bit (opengl)

    When I run the release from QT-Creator, it’s successfully starting the Application. When deploying using windeployqt.exe it’s not working on any other machine, which has not installed QT.


    Threads read so far and applied:

    Tested Solutions not working or partially:

    1) Using windeployqt.exe

    As suggested from Forum threads, I used windeployqt.exe for deploying, the commands I’ve used

    a) First setting the environment variable for my QT version
    @set PATH=C:\Qt\5.4\msvc2010_opengl\bin;%PATH%@

    b) Calling windeployqt.exe with path to my executable
    @windeployqt.exe C:\build-AssetBrowserWidget-Desktop_Qt_5_4_0_MSVC2010_OpenGL_32bit-Debug\debug\AssetBrowserWidget.exe@

    Output of windeployqt.exe:
    @Warning: Cannot find Visual Studio redistributable in C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\redist@

    But I files are persistent in:
    C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\redist\x64\Microsoft.VC100.CRT
    a) msvcp100.dll, msvcr100.dll

    Anyhow this shouldn’t be the problem why the Application is not starting. (Go to Point 4 for the Reason)

    2) I tried the naively copying copying all .dll files (those in Qt) into the root directory of my application

    I tried as well to copy the insides of plugins all *.dll to the root

    This didn’t change anything

    3) I tried to setting the library Path in my Code before the QApplication is started and this worked partially

    @ b<<".";

    This starts the Application, but obviously the plugins are not fully loaded, as the SQLite module isn’t working. The folders* sqldrivers, imageformats, iconengines,* are not touched, as i can remove them and nothing changes. The qwindow.dll which is under “paltforms” is seen by the application, when i remove the folder platforms, the application is starting and crashing immediately like before.

    I tried to set the Path to the plugin
    @QApplication::addLibraryPath( QApplication::applicationDirPath() + QDir::separator() + "plugins");@

    4) Hiding System Files on developement machine
    One more thing to mention, when i "hide" the* C:\Qt\5.4\msvc2010_opengl* folder then my application isn't starting on my development machine either, so i am sure, some files in this directory are missing.

    I am completely lost and i am really asking, why every other bit in Qt is smooth but the deployment process is obviously not out of the box.__

    Here i am posting as well my Pro file:
    @CONFIG +=c++11

    QT += core widgets gui multimedia designer sql

    TARGET = AssetBrowserWidget
    TEMPLATE = app

    SOURCES += main.cpp

    HEADERS += widget.h

    FORMS += widget.ui

    RESOURCES += Style.qrc


  • Hi, agreed deployment of Qt apps can be troublesome, I think you need a complete list of the DLLs used by your app:
    Start your app from Qt Creator, then try this utility: "ListDLLs":

    Launch ListDLLs from a CMD window, e.g. "listdlls AssetBrowserWidget", then you'll see where the plugins are loaded from.

  • Lifetime Qt Champion

    Hi and welcome to devnet,

    Do you have any error message ?

    Note that you are trying to deploy a debug build, you should first make it a release

  • @hskoglund i will give that a try tomorrow
    @SGaist the error message is somehow gone, i had it as an image, but it was something like "runtime error" without much informaiton. Furthermore i tested it both with Release and Debug.

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