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The QT program developed under win10 runs incorrectly on win7

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  • B Offline
    B Offline
    bergerac
    wrote on last edited by
    #4
       Thanks @JonB and @hskoglund.
       @hskoglund , I followed your advice and downloaded the QT(6.2.1) installation package from the QT official website, but an error which said "Error during installation process (qt.qt6.621.win64_msvc2019_64): Running "E:\Qt\6.2.1\msvc2019_64\bin\qmake.exe" resulted in a crash." was reported on win7. Have you ever encountered this problem?Thank you again for your reply.
    
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    • hskoglundH Offline
      hskoglundH Offline
      hskoglund
      wrote on last edited by
      #5

      Yes, see my older post this error is to be expected since the MaintenanceTool tries to launch qmake for an unpatched 6.2.2 on your Windows 7.
      Just click "Ignore" (have to do it two times), then 6.2.2 should be installed anway. Then you can try downloading my zip and replacing Qt6Core.dll, Qt6Gui.dll and qwindows.dll...

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      • B Offline
        B Offline
        bergerac
        wrote on last edited by
        #6

        @hskoglund, I replaced the three libraries according to the steps by
        https://forum.qt.io/topic/133002/qt-creator-6-0-1-and-qt-6-2-2-running-on-windows-7, and then ran QT creator ,
        but there was an error “This application failed to start because no Qt platform plugin could be initialized.
        Reinstalling the application may fix this problem.Available platforms plugins are:direct2d,minimal,offscreen,windows.”
        Have you ever encountered this error?

        JonBJ 1 Reply Last reply
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        • B bergerac

          @hskoglund, I replaced the three libraries according to the steps by
          https://forum.qt.io/topic/133002/qt-creator-6-0-1-and-qt-6-2-2-running-on-windows-7, and then ran QT creator ,
          but there was an error “This application failed to start because no Qt platform plugin could be initialized.
          Reinstalling the application may fix this problem.Available platforms plugins are:direct2d,minimal,offscreen,windows.”
          Have you ever encountered this error?

          JonBJ Offline
          JonBJ Offline
          JonB
          wrote on last edited by JonB
          #7

          @bergerac
          While you wait for a specific solution from @hskoglund .

          Whenever you get "no Qt platform plugin could be initialized", to diagnose set environment variable QT_DEBUG_PLUGINS=1 in a shell/terminal and then run your application. You should get a stream of diagnostic output. Look right near the end for whatever the cause of your final problem is.

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          • hskoglundH Offline
            hskoglundH Offline
            hskoglund
            wrote on last edited by
            #8

            Hi @bergerac most likely you successfully replaced Qt6Core.dll and Qt6Gui.dll but not qwindows.dll.
            If you look in your C:\Qt\Tools\QtCreator\bin\plugins\platforms folder, the original qwindows.dll is from November 23, 2021 with a size of 780568 bytes.
            My patched version is from December 21. 2021 with a size of 763904 bytes.

            If you have the one from November that could explain the error "The application failed..."
            Otherwise you can try following the advice from @JonB

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            • B Offline
              B Offline
              bergerac
              wrote on last edited by
              #9

              Hi @JonB @hskoglund
              I checked the qwindows.dll again and confirmed that it had been replaced.
              Then i use @JonB method to run QT creator.exe by cmd, but did not get any output report.Did I miss something?

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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
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                  • 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
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                    • 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
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                      • 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
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                        • 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.

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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.""

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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?

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                              • 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
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                                • 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...

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                                  • 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.

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                                    • 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
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                                      • 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.

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                                        • 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
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