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[SOLVED]Failed to load platform plugin "windows"

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  • JKSHJ Online
    JKSHJ Online
    JKSH
    Moderators
    wrote on last edited by
    #30

    [quote author="abraker95" date="1402618312"]
    EDIT 2:
    After adding the "Accessible" folder from the plugins directory the program works fine in Qt. It still crashes when not running from Qt, however.[/quote]That doesn't sound right. If you click the "Run" button, Qt Creator will find the DLLs automatically. You shouldn't need to copy anything.

    Where did you copy the folder into?

    After you follow the steps in my previous post, please post a screenshot of Tools -> Options -> Build & Run -> Kits

    Qt Doc Search for browsers: forum.qt.io/topic/35616/web-browser-extension-for-improved-doc-searches

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    • A Offline
      A Offline
      abraker95
      wrote on last edited by
      #31

      I copied the folder to where the application is.

      Here:
      !http://i59.tinypic.com/xgigj9.jpg(Kit)!

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      • hskoglundH Offline
        hskoglundH Offline
        hskoglund
        wrote on last edited by
        #32

        Hi, I see on your computer, MinGW and Visual Studio are both installed, this will invariably lead to problems. I think, if you want to have 2 different compilers, you need to have 2 different computers.

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        • JKSHJ Online
          JKSHJ Online
          JKSH
          Moderators
          wrote on last edited by
          #33

          @abraker95: I'm surprised that you don't have anything auto-detected. How did you install Qt? What packages did you download?

          [quote author="hskoglund" date="1402630458"]Hi, I see on your computer, MinGW and Visual Studio are both installed, this will invariably lead to problems. I think, if you want to have 2 different compilers, you need to have 2 different computers. [/quote]That in itself isn't an issue. I have Qt for both MinGW and MSVC 2013 on my computer; they can coexist just fine.

          However, abraker95 has done manual configuration for his kits, so they might not have been set up correctly. That why I recommended removing Qt and MinGW from the PATH, and uninstalling unneeded copies.

          Qt Doc Search for browsers: forum.qt.io/topic/35616/web-browser-extension-for-improved-doc-searches

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          • A Offline
            A Offline
            abraker95
            wrote on last edited by
            #34

            I finally got both the debug and release versions of the applications working from Qt and from the folders when the appropriate DLL's are copied. However, as you have said, Qt doesn't want to auto-detect anything.

            These are the environment variables I found relating to Qt in the projects tab on the left:
            PATH: C:\Qt\5.3\msvc2013\bin
            QTDIR: C:\Qt\5.3\msvc2013

            I found no environment variables relating to MingW (I do have it installed, though). More confusing, why doesn't the application run from Qt when clearly the path to the Qt version is set without the copied DLL's?

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            • A Offline
              A Offline
              abraker95
              wrote on last edited by
              #35

              I finally solved that problem too!
              Thank this thread: "Fix":http://qt-project.org/forums/viewthread/29372

              So to get the application to be run from Qt without copying DLL's over, you will have to add an environment variable to the project's settings. Note that I'm using msvc2013 in this example, so replace that with what you are using. Here are the baby steps on doing this:

              1. Head over to the projects tab on the left
              2. On the top you will see the kit(s) you are using to build the project with. Click on run (which is right next to "build"). This will bring you to a similar, yet a little different page.
              3. Scroll down until you see Run Environment
              4. Click on details on the right to expand the section
              5. Click on the add button on right
              6. Type or Copy/Paste QT_QPA_PLATFORM_PLUGIN_PATH as the variable name on the lest column.
              7. In the right column, type in the directory in which you platform is in. In my case, it is "C:\Qt\5.3\msvc2013\plugins\platforms".
              8. Run the project

              Edit: For step 7, "$(QTDIR)\plugins\platforms" should be able to automatically point to the needed directory. Thank this thread: "link":http://qt-project.org/forums/viewthread/26001

              If you are getting any errors relating to DLL's or something like so:
              "The instruction at 0×5b175f0d referenced memory at 0×00000000. The memory could not be read.
              Click on OK to terminate the program"
              Then you probably don't have an environment variable pointing to the bin directory of the compiler you are using.

              I wish the process would have been simpler. hskoglund, perhaps you might include this in your blog as well?

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              • hskoglundH Offline
                hskoglundH Offline
                hskoglund
                wrote on last edited by
                #36

                Hi, it's in "my blog":http://www.tripleboot.org/?p=536 (scroll down to bonus contents) but I had a spelling error: -QT_QPA_PLUGIN_PATH- fixed now.

                Good it worked for you, but using QT_ QPA_PLATFORM_PLUGIN_PATH I think has 2 disadvantages:

                1. If your app depends on other plugins/subdirectories, for example imageformats or sqldrivers, then this environment variable has no effect
                2. if you deploy your app to another computer then you must remember to set the environment variable on that computer as well.
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                • A Offline
                  A Offline
                  abraker95
                  wrote on last edited by
                  #37

                  I wonder why the IDE doesn't set the platform directory by default.

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                  • hskoglundH Offline
                    hskoglundH Offline
                    hskoglund
                    wrote on last edited by
                    #38

                    It does when you install Qt, the installer writes the plugin path into Qt5Core.dll and qmake.exe.

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                    • F Offline
                      F Offline
                      frankiefrank
                      wrote on last edited by
                      #39

                      hskoglund - that last comment really helped me out! I was changing Qt versions, copied my DLLs (including Qt5Cored.dll) to the deployment target location. After a while I needed to reinstall the Qt version and I didn't have a clue why it wouldn't work - until I read your comment about the installer's change.

                      "Roads? Where we're going, we don't need roads."

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                      • S Offline
                        S Offline
                        silviutp
                        wrote on last edited by
                        #40

                        I have also had headakes with my app which worked in Qt Creator and on my computer but not on other computer.
                        The problem was that I was not using the correct qwindows.dll. I used the version from P:\Qt\Qt5.1.1-mingw\Tools\QtCreator\bin\plugins\platforms.
                        The correct version is in P:\Qt\Qt5.1.1-mingw\5.1.1\mingw48_32\plugins\platforms
                        As hskoglund said, you should'n probably use dlls from qtcreator folder.

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                        • SavedS Offline
                          SavedS Offline
                          Saved
                          wrote on last edited by
                          #41

                          Hello,

                          I have a similar problem. I've read some stuff, but nothing works for me.

                          I've deploy my application with windeployqt (Readed here and here). On my PC the solution works fine. Another PC has following error message:

                          This application failed to start because it could not find or load the Qt platform plugin "windows".
                          
                          Reinstalling the application may fix this problem.
                          

                          Following steps I've tried:

                          1. Created with platforms sub-folder. The error message was extended in this case to:

                            This application failed to start because it could not find or load the Qt platform plugin "windows".
                            
                            Available platform plugins are: minimal, offscreen, windows, windows.,
                            
                            Reinstalling the application may fix this problem.
                            
                          2. Used dependency walker for checking the dlls.

                            IESHIMS.DLL		-> also missing on my PC
                            SHLWAPI.DLL
                            IEFRAME.DLL		-> this one is the deley-load depenceny (see error message below)
                            
                            Warning: At least one delay-load dependency module was not found.
                            Warning: At least one module has an unresolved import due to a missing export function in a delay-load dependent module.
                            

                            Copying the ieframe.dll from C:\Windows\System32 to release folder will also not fix it.

                          3. Checked this. No success.

                          4. Trying to add to main.cpp

                            QCoreApplication::addLibraryPath("./");
                            QCoreApplication::addLibraryPath("./platforms");
                            

                            No success.

                          5. Also checked this thread.

                          6. Also tried to add libEGL.dll to the package. No success.

                          I developing on Windows XP with Qt 5.4 and MinGW 4.91 32 bit compiler. Some test PC's are Windows 7.

                          Has anyone hints for me? The message "no windows plugin. Available plugins windows, windows" is also strange.

                          JKSHJ 1 Reply Last reply
                          0
                          • SavedS Saved

                            Hello,

                            I have a similar problem. I've read some stuff, but nothing works for me.

                            I've deploy my application with windeployqt (Readed here and here). On my PC the solution works fine. Another PC has following error message:

                            This application failed to start because it could not find or load the Qt platform plugin "windows".
                            
                            Reinstalling the application may fix this problem.
                            

                            Following steps I've tried:

                            1. Created with platforms sub-folder. The error message was extended in this case to:

                              This application failed to start because it could not find or load the Qt platform plugin "windows".
                              
                              Available platform plugins are: minimal, offscreen, windows, windows.,
                              
                              Reinstalling the application may fix this problem.
                              
                            2. Used dependency walker for checking the dlls.

                              IESHIMS.DLL		-> also missing on my PC
                              SHLWAPI.DLL
                              IEFRAME.DLL		-> this one is the deley-load depenceny (see error message below)
                              
                              Warning: At least one delay-load dependency module was not found.
                              Warning: At least one module has an unresolved import due to a missing export function in a delay-load dependent module.
                              

                              Copying the ieframe.dll from C:\Windows\System32 to release folder will also not fix it.

                            3. Checked this. No success.

                            4. Trying to add to main.cpp

                              QCoreApplication::addLibraryPath("./");
                              QCoreApplication::addLibraryPath("./platforms");
                              

                              No success.

                            5. Also checked this thread.

                            6. Also tried to add libEGL.dll to the package. No success.

                            I developing on Windows XP with Qt 5.4 and MinGW 4.91 32 bit compiler. Some test PC's are Windows 7.

                            Has anyone hints for me? The message "no windows plugin. Available plugins windows, windows" is also strange.

                            JKSHJ Online
                            JKSHJ Online
                            JKSH
                            Moderators
                            wrote on last edited by JKSH
                            #42

                            Hi,

                            @Saved said:

                            The message "no windows plugin. Available plugins windows, windows" is also strange.

                            That means your program found the qwindows.dll plugin, but could not load it. Usually, it's because a dependency is missing. Follow https://wiki.qt.io/Deploy_an_Application_on_Windows carefully.

                            Qt Doc Search for browsers: forum.qt.io/topic/35616/web-browser-extension-for-improved-doc-searches

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                            1
                            • SavedS Offline
                              SavedS Offline
                              Saved
                              wrote on last edited by Saved
                              #43

                              Thank you JKSH for your fast reply.

                              I've pointed out that my app works fine on all systems with platforms sub-folder expect my usual test environment in a VM.

                              Regards.

                              JKSHJ 1 Reply Last reply
                              0
                              • SavedS Saved

                                Thank you JKSH for your fast reply.

                                I've pointed out that my app works fine on all systems with platforms sub-folder expect my usual test environment in a VM.

                                Regards.

                                JKSHJ Online
                                JKSHJ Online
                                JKSH
                                Moderators
                                wrote on last edited by
                                #44

                                @Saved said:

                                Thank you JKSH for your fast reply.

                                I've pointed out that my app works fine on all systems with platforms sub-folder expect my usual test environment in a VM.

                                Regards.

                                You're welcome.

                                I'm not quite sure where you're at now: Are you still facing the same problem? Have you followed the wiki instructions for your VM?

                                Qt Doc Search for browsers: forum.qt.io/topic/35616/web-browser-extension-for-improved-doc-searches

                                SavedS 1 Reply Last reply
                                0
                                • JKSHJ JKSH

                                  @Saved said:

                                  Thank you JKSH for your fast reply.

                                  I've pointed out that my app works fine on all systems with platforms sub-folder expect my usual test environment in a VM.

                                  Regards.

                                  You're welcome.

                                  I'm not quite sure where you're at now: Are you still facing the same problem? Have you followed the wiki instructions for your VM?

                                  SavedS Offline
                                  SavedS Offline
                                  Saved
                                  wrote on last edited by
                                  #45

                                  @JKSH

                                  @Saved said:

                                  I've pointed out that my app works fine on all systems with platforms sub-folder expect my usual test environment in a VM.

                                  I did meant I've find out... Sorry.
                                  My problem is solved now.

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                                  0
                                  • D Offline
                                    D Offline
                                    Dave W
                                    wrote on last edited by
                                    #46

                                    I have tried all these solutions on a new windows 10 machine and nothing has worked yet. I have migrated some old Clipper code to Harbour with QT. I was able to compile and run it fine on an XP machine. When I moved the executable folder from the XP machine to the Win10 machine, the program still ran fine. After I compile it on the Win 10 machine, it no longer runs. Obviously, something in the build process is not working correctly.

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                                    0
                                    • mrjjM Offline
                                      mrjjM Offline
                                      mrjj
                                      Lifetime Qt Champion
                                      wrote on last edited by
                                      #47

                                      Hi
                                      " After I compile it on the Win 10 machine, it no longer runs. "

                                      It's a bit unclear what stopped working. When you compile
                                      on win 10, it will not even run in Creator?
                                      Or do you mean run from deploy folder?
                                      (standalone)

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