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The QT program developed under win10 runs incorrectly on win7

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  • hskoglundH Offline
    hskoglundH Offline
    hskoglund
    wrote on last edited by
    #10

    To see the output you need to start DbgView

    JonBJ 1 Reply Last reply
    1
    • hskoglundH hskoglund

      To see the output you need to start DbgView

      JonBJ Offline
      JonBJ Offline
      JonB
      wrote on last edited by
      #11

      @hskoglund
      Ah, I'm not a Windows Qt user. So it doesn't just output to stdout/err under Windows if run from a Command prompt?

      hskoglundH 1 Reply Last reply
      0
      • JonBJ JonB

        @hskoglund
        Ah, I'm not a Windows Qt user. So it doesn't just output to stdout/err under Windows if run from a Command prompt?

        hskoglundH Offline
        hskoglundH Offline
        hskoglund
        wrote on last edited by hskoglund
        #12

        @JonB No that would be too easy, but DbgView to the rescue.

        JonBJ 1 Reply Last reply
        1
        • hskoglundH hskoglund

          @JonB No that would be too easy, but DbgView to the rescue.

          JonBJ Offline
          JonBJ Offline
          JonB
          wrote on last edited by JonB
          #13

          @hskoglund
          :) When I am advising people of this, do they have to download that DbgView, will it be there if they have MSVC or MinGW only?

          hskoglundH 1 Reply Last reply
          0
          • B Offline
            B Offline
            bergerac
            wrote on last edited by
            #14

            Hi @hskoglund @JonB
            DbgView.exe shows the information
            "[28200] qt.qpa.plugin: Could not load the Qt platform plugin "windows" in "" even though it was found.
            [28200] This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.
            [28200] Available platform plugins are: direct2d, minimal, offscreen, windows."

            JonBJ 1 Reply Last reply
            0
            • JonBJ JonB

              @hskoglund
              :) When I am advising people of this, do they have to download that DbgView, will it be there if they have MSVC or MinGW only?

              hskoglundH Offline
              hskoglundH Offline
              hskoglund
              wrote on last edited by
              #15

              @JonB Again, that would be too easy. One of the first things I do a new Windows PC is to download the complete SysInternals suite.

              1 Reply Last reply
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              • hskoglundH Offline
                hskoglundH Offline
                hskoglund
                wrote on last edited by
                #16

                @bergerac Please include the text before "...[28200] qt.qpa.plugin: Could not load the Qt platform plugin "windows" in "" even though it was found.""

                1 Reply Last reply
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                • B bergerac

                  Hi @hskoglund @JonB
                  DbgView.exe shows the information
                  "[28200] qt.qpa.plugin: Could not load the Qt platform plugin "windows" in "" even though it was found.
                  [28200] This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.
                  [28200] Available platform plugins are: direct2d, minimal, offscreen, windows."

                  JonBJ Offline
                  JonBJ Offline
                  JonB
                  wrote on last edited by
                  #17

                  @bergerac
                  What did you do for

                  to diagnose set environment variable QT_DEBUG_PLUGINS=1 in a shell/terminal and then run your application.

                  because your output looks just like it was?

                  1 Reply Last reply
                  0
                  • B Offline
                    B Offline
                    bergerac
                    wrote on last edited by
                    #18

                    Hi @hskoglund @JonB
                    @hskoglund There was nothing else before that information.
                    @JonB I open cmd, enter "set qt_debug_plugins = 1", and then locate to the installation directory to run QT Creator.exe.

                    JonBJ 1 Reply Last reply
                    0
                    • hskoglundH Offline
                      hskoglundH Offline
                      hskoglund
                      wrote on last edited by
                      #19

                      Hi, the output should be a couple of thousand lines, the first one should be:

                      1  0.00000  [28200] QFactoryLoader::QFactoryLoader() checking directory path "C:/Qt/Tools/QtCreator/bin/plugins/platforms" ...
                      

                      don't need all thousands of lines, just say the 40 at the end...

                      1 Reply Last reply
                      0
                      • B bergerac

                        Hi @hskoglund @JonB
                        @hskoglund There was nothing else before that information.
                        @JonB I open cmd, enter "set qt_debug_plugins = 1", and then locate to the installation directory to run QT Creator.exe.

                        JonBJ Offline
                        JonBJ Offline
                        JonB
                        wrote on last edited by JonB
                        #20

                        @bergerac
                        There ought be preceding output.

                        Try SET QT_DEBUG_PLUGINS=1, just in case capitals matter, though I suspect not under Windows, but don't know.

                        locate to the installation directory to run QT Creator.exe.

                        That is not what I said. I said run the executable, not Creator. It is not apparent to me the variable will necessarily be passed to the application when run from there. If you do it that way you should look inside Creator where you see the "runtime environment variables" set up. Which is why running the program directly from the Command prompt is simpler.

                        1 Reply Last reply
                        0
                        • B Offline
                          B Offline
                          bergerac
                          wrote on last edited by
                          #21

                          Hi @JonB @hskoglund
                          I run QT creator.exe directly , and then can see the debugging information
                          "[28668] QFactoryLoader::QFactoryLoader() checking directory path "E:/Qt/Tools/QtCreator/bin/platforms" ...
                          [28668] Cannot load library E:\Qt\Tools\QtCreator\bin\plugins\platforms\qwindows--.dll: The specified program could not be found.
                          [28668] QLibraryPrivate::loadPlugin failed on "E:/Qt/Tools/QtCreator/bin/plugins/platforms/qwindows--.dll" : "Cannot load library E:\Qt\Tools\QtCreator\bin\plugins\platforms\qwindows--.dll: The specified program could not be found."
                          I renamed the old library as qwindows--.dll and put the new library in.Debugging information indicates that QT creator is still looking for old library when it runs.

                          JonBJ 1 Reply Last reply
                          0
                          • B bergerac

                            Hi @JonB @hskoglund
                            I run QT creator.exe directly , and then can see the debugging information
                            "[28668] QFactoryLoader::QFactoryLoader() checking directory path "E:/Qt/Tools/QtCreator/bin/platforms" ...
                            [28668] Cannot load library E:\Qt\Tools\QtCreator\bin\plugins\platforms\qwindows--.dll: The specified program could not be found.
                            [28668] QLibraryPrivate::loadPlugin failed on "E:/Qt/Tools/QtCreator/bin/plugins/platforms/qwindows--.dll" : "Cannot load library E:\Qt\Tools\QtCreator\bin\plugins\platforms\qwindows--.dll: The specified program could not be found."
                            I renamed the old library as qwindows--.dll and put the new library in.Debugging information indicates that QT creator is still looking for old library when it runs.

                            JonBJ Offline
                            JonBJ Offline
                            JonB
                            wrote on last edited by
                            #22

                            @bergerac
                            Is you problem you reported earlier when you run Creator or when you run your application?
                            I think I had misunderstood, I thought it was your program, now I think it is Creator you cannot run, but it is not clear.

                            1 Reply Last reply
                            0
                            • B Offline
                              B Offline
                              bergerac
                              wrote on last edited by
                              #23

                              Hi @JonB
                              My topic is the problem of running the developed application. Later, @hskoglund provided the modified Qt library and asked me to
                              build the development environment directly on win7 and develop application with QT creator. Therefore, the error later was the running error of Creator.
                              I'm sorry I didn't make it clear. Thank you again.

                              JonBJ 1 Reply Last reply
                              0
                              • B bergerac

                                Hi @JonB
                                My topic is the problem of running the developed application. Later, @hskoglund provided the modified Qt library and asked me to
                                build the development environment directly on win7 and develop application with QT creator. Therefore, the error later was the running error of Creator.
                                I'm sorry I didn't make it clear. Thank you again.

                                JonBJ Offline
                                JonBJ Offline
                                JonB
                                wrote on last edited by
                                #24

                                @bergerac I see. Then i must leave you in his hands for Qt6 issues.

                                1 Reply Last reply
                                0
                                • hskoglundH Offline
                                  hskoglundH Offline
                                  hskoglund
                                  wrote on last edited by
                                  #25

                                  Hi @bergerac sorry that it didn't work out as planned.

                                  I think best solution is to install on older version of Qt Creator that uses Qt5, i.e. has no problems (and requires no patching :-) to run on your Windows 7.

                                  A download of Qt Creator 5.0.3 you can find here (the first link).

                                  When you start Qt Creator 5.0.3 the first time, a yellow box will be shown: "Link with a Qt installation to automatically register..." just click Yes (and I think you have to click Yes one more time). Then you can use that version of Qt Creator the normal way.

                                  1 Reply Last reply
                                  0
                                  • B Offline
                                    B Offline
                                    bergerac
                                    wrote on last edited by
                                    #26

                                    Hi @hskoglund
                                    I will follow your advice.
                                    Thanks again for your help @JonB and @hskoglund

                                    1 Reply Last reply
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