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DLL is missing when launching the QT GUI app



  • Hello guys , My app launches from inside Qt Creator no problem, but when I go into the debug folder, I find the .exe file and I try to launch it, it complains that there is a missing DLL ( Qt5Network.dll , Qt5SerialPortd.dll , Qt5Cored.dll ,Qt5Guid.dll )
    how can i add thoose DLL ? thanks


  • Moderators

    @Zunneh said in DLL is missing when launching the QT GUI app:

    when I go into the debug folder, I find the .exe file and I try to launch it, it complains that there is a missing DLL

    Hi @Zunneh, you must deploy your application to run it outside of Qt Creator: https://doc.qt.io/qt-5/windows-deployment.html



  • @JKSH it work , thank you guy , now my problem is , i made a copy off my final app in another computer to test it , when i double click to the .exe , it didn't say that there are DLL missing but it didn't open the app . in my main computer ( where i developed the app with Qt ) it work perfectly after added the DLL , can someone help me please ? Thanks



  • @Zunneh
    Assuming now that you are OK on the DLLs, and the deployment went well/didn't report anything, nobody will be able to tell you why your app may be behaving like this on a different installation. There are many possibilities. You either have to debug (may or may not be convenient), or you have to a insert a few "print"/"logging" statements or similar into your code to get an idea how far (if at all) it gets through the start up/code.


  • Moderators

    @Zunneh, I notice that you tried to launch a Debug build. I can tell because all your DLLs end with a d.

    Have you tried deploying a Release build? (Your app should be deployed with Qt5Core.dll, Qt5Gui.dll, ... not Qt5Cored.dll, Qt5Guid.dll, ...)


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