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[SOLVED] Failed to load platform plugin.

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  • L Offline
    L Offline
    lgeyer
    wrote on last edited by
    #6

    It is actually platform s /qwindows.dll, not platform/qwindows.dll. Be aware that you will have to deploy platforms/qwindows d .dll if you are deploying a debug build.

    With these changes, do you still get <code>Failed to load platform plugin "windows". Available platforms are:</code>?

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    • S Offline
      S Offline
      soroush
      wrote on last edited by
      #7

      [quote author="Lukas Geyer" date="1357301238"]It is actually platform s /qwindows.dll, not platform/qwindows.dll.[/quote]

      Yea, my typo

      [quote author="Lukas Geyer" date="1357301238"]Be aware that you will have to deploy platforms/qwindows d .dll if you are deploying a debug build.

      With these changes, do you still get <code>Failed to load platform plugin "windows". Available platforms are:</code>?[/quote]

      I tried both debug and release builds with libraries with/without debugging symbols. It's still same.

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      • L Offline
        L Offline
        lgeyer
        wrote on last edited by
        #8

        Using the <code>-platformpluginpath</code> command line option or the <code>QT_QPA_PLATFORM_PLUGIN_PATH</code> environment variable might be another option, but Qt should pickup the plugin automatically when placed in the correct location.

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        • S Offline
          S Offline
          soroush
          wrote on last edited by
          #9

          [quote author="Lukas Geyer" date="1357305345"]Using the <code>-platformpluginpath</code> command line option or the <code>QT_QPA_PLATFORM_PLUGIN_PATH</code> environment variable might be another option, but Qt should pickup the plugin automatically when placed in the correct location.[/quote]

          It is there, I copied everything beside the program executable. I believe it's in visible scope for linkage. The problem might be related to msvcrt .

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          • Chris KawaC Offline
            Chris KawaC Offline
            Chris Kawa
            Lifetime Qt Champion
            wrote on last edited by
            #10

            qwindows.dll shouldn't be in the same dir as the executable. Put it in the platforms subdirectory.

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            • S Offline
              S Offline
              soroush
              wrote on last edited by
              #11

              [quote author="Krzysztof Kawa" date="1357310438"]qwindows.dll shouldn't be in the same dir as the executable. Put it in the platforms subdirectory.[/quote]
              Ah my bad memory :P In fact I have had same problem with paths for mysql driver on windows... Now works fine.

              Thank you

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              • M Offline
                M Offline
                MuldeR
                wrote on last edited by
                #12

                [quote author="Lukas Geyer" date="1357298812"]Did you deploy platform/qwindows.dll as well? (It will not show up in Dependency Walker).[/quote]

                FWIW: DLL's that are loaded at runtime, like Plug-in DLL's, do show up in Dependency Walker, but only when you use the "profiling" feature. They of course cannot be found by only analyzing the static import tables...

                My OpenSource software at: http://muldersoft.com/

                Qt v4.8.6 MSVC 2013, static/shared: http://goo.gl/BXqhrS

                Go visit the coop: http://youtu.be/Jay...

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                • L Offline
                  L Offline
                  lgeyer
                  wrote on last edited by
                  #13

                  Profiling never worked quite well for me (STATUS_STACK_BUFFER_OVERRUN and alike), but good to know. Thanks for sharing.

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                  • T Offline
                    T Offline
                    ThomasAn
                    wrote on last edited by
                    #14

                    Can you elaborate how this issue was fixed ?
                    You created a "platforms" directory inside your project folder and put the qwindows.dll in there ?

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                    • S Offline
                      S Offline
                      Shuhard
                      wrote on last edited by
                      #15

                      Looks like you have to create "platforms" directory in folder, were your program runs. For example, I have "debug" folder in my project, and I copied "platforms" directory there from "c:\Qt\Qt5.0.1\5.0.1\mingw47_32\plugins". This solved my problem.

                      Also you can copy other plugins if needed.

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                      • Chris KawaC Chris Kawa

                        qwindows.dll shouldn't be in the same dir as the executable. Put it in the platforms subdirectory.

                        W Offline
                        W Offline
                        welmore
                        wrote on last edited by
                        #16

                        @Chris-Kawa

                        Hi. I did as you said and it worked! thanks!
                        welmore

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