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QCamera busy problem

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  • C CptN3m0

    @mrjj said in QCamera busy problem:

    Hi
    Why does it say that ?
    You try to open it multiple times or does your app crash and dont clean up ?
    I have not seen such feature in QCamera and it seems to be very tied to the OS
    but there might be :)

    @SGaist said in QCamera busy problem:

    Hi,

    What are you doing with that camera ?

    Hi, its just when the app crash suddenly, the camera dont clean up and I got an error message at the next run, that the camera is busy.

    T Offline
    T Offline
    thippu
    wrote on last edited by thippu
    #5

    @CptN3m0 Hi,
    are u using c++?
    solution is:
    delete the QCamera object before u initialize it,
    do like this to avoid program crash

    //cam is QCamera Pointer object
    if(cam)
    {
    delete cam;
    }
    //Then do initialization of cam object 
    
    
    

    It will frees the previous resource if it is still holding.
    Let me the status of ur problem.
    :)

    jsulmJ 1 Reply Last reply
    0
    • T thippu

      @CptN3m0 Hi,
      are u using c++?
      solution is:
      delete the QCamera object before u initialize it,
      do like this to avoid program crash

      //cam is QCamera Pointer object
      if(cam)
      {
      delete cam;
      }
      //Then do initialization of cam object 
      
      
      

      It will frees the previous resource if it is still holding.
      Let me the status of ur problem.
      :)

      jsulmJ Offline
      jsulmJ Offline
      jsulm
      Lifetime Qt Champion
      wrote on last edited by
      #6

      @thippu You are aware that there is nothing to delete if you did not yet initialize it?

      https://forum.qt.io/topic/113070/qt-code-of-conduct

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      • jsulmJ jsulm

        @thippu You are aware that there is nothing to delete if you did not yet initialize it?

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        thippu
        wrote on last edited by
        #7

        @jsulm yeah,
        It won't enter the if statement ,if there is nothing;

        jsulmJ 1 Reply Last reply
        0
        • T thippu

          @jsulm yeah,
          It won't enter the if statement ,if there is nothing;

          jsulmJ Offline
          jsulmJ Offline
          jsulm
          Lifetime Qt Champion
          wrote on last edited by
          #8

          @thippu That's the point: it will not solve the issue as it will not do anything

          https://forum.qt.io/topic/113070/qt-code-of-conduct

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          • jsulmJ jsulm

            @thippu That's the point: it will not solve the issue as it will not do anything

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            thippu
            wrote on last edited by thippu
            #9

            @jsulm How can you say, it can not solve?Have you tried this?

            jsulmJ 1 Reply Last reply
            0
            • T thippu

              @jsulm How can you say, it can not solve?Have you tried this?

              jsulmJ Offline
              jsulmJ Offline
              jsulm
              Lifetime Qt Champion
              wrote on last edited by
              #10

              @thippu You start the app, it crashes and leaves the device in busy state. Now you start the app again and execute this lines:

              // cam will not be initialized, so if part will not be executed
              // So, how can this fix the problem?
              if(cam)
              {
                  delete cam; // This will NEVER be executed
              }
              

              https://forum.qt.io/topic/113070/qt-code-of-conduct

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              • jsulmJ jsulm

                @thippu That's the point: it will not solve the issue as it will not do anything

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                thippu
                wrote on last edited by
                #11

                @jsulm .It will enter the if statement ,if there is any previous resource right?

                jsulmJ T 2 Replies Last reply
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                • T thippu

                  @jsulm .It will enter the if statement ,if there is any previous resource right?

                  jsulmJ Offline
                  jsulmJ Offline
                  jsulm
                  Lifetime Qt Champion
                  wrote on last edited by
                  #12

                  @thippu There will not be previous ressource in the app as you start the app again...

                  https://forum.qt.io/topic/113070/qt-code-of-conduct

                  1 Reply Last reply
                  0
                  • SGaistS Offline
                    SGaistS Offline
                    SGaist
                    Lifetime Qt Champion
                    wrote on last edited by
                    #13

                    The memory used in an application run has nothing to do with the memory used in the next run. Therefore an object allocated in one application run won't be available at all in the next run. The memory space have nothing in common.

                    Interested in AI ? www.idiap.ch
                    Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

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                    • jsulmJ jsulm

                      @thippu You start the app, it crashes and leaves the device in busy state. Now you start the app again and execute this lines:

                      // cam will not be initialized, so if part will not be executed
                      // So, how can this fix the problem?
                      if(cam)
                      {
                          delete cam; // This will NEVER be executed
                      }
                      
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                      T Offline
                      thippu
                      wrote on last edited by
                      #14

                      @jsulm said in QCamera busy problem:

                      @thippu You start the app, it crashes and leaves the device in busy state. Now you start the app again and execute this lines:

                      // cam will not be initialized, so if part will not be executed
                      // So, how can this fix the problem?
                      if(cam)//if cam not initialized this statement will not be executed right?
                      {
                          delete cam; // This will NEVER be executed
                      }
                      
                      1 Reply Last reply
                      0
                      • T thippu

                        @jsulm .It will enter the if statement ,if there is any previous resource right?

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                        T Offline
                        thippu
                        wrote on last edited by
                        #15

                        @thippu yes ,you are getting it;

                        1 Reply Last reply
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                        • SGaistS SGaist

                          The memory used in an application run has nothing to do with the memory used in the next run. Therefore an object allocated in one application run won't be available at all in the next run. The memory space have nothing in common.

                          T Offline
                          T Offline
                          thippu
                          wrote on last edited by
                          #16

                          @SGaist Yes, true

                          1 Reply Last reply
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