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A camera problem.

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  • SGaistS SGaist

    The buffer just means it's in memory. You'll get a frame to process and then it's up to you to save it.

    J Offline
    J Offline
    jenya7
    wrote on last edited by
    #19

    @SGaist said in A camera problem.:

    The buffer just means it's in memory. You'll get a frame to process and then it's up to you to save it.

    After

    g_camera.SetCaptureMode(QCamera::CaptureMode::CaptureStillImage);
    g_camera.takeImage();
    

    Nothing happens. I didn't get to

    void Camera::processCapturedImage(int requestId, const QImage& img)
    

    or

    void Camera::imageSaved(int id, const QString &fileName)
    

    How do I know where is the image (if it was taken at all)?

    jsulmJ 1 Reply Last reply
    0
    • J jenya7

      @SGaist said in A camera problem.:

      The buffer just means it's in memory. You'll get a frame to process and then it's up to you to save it.

      After

      g_camera.SetCaptureMode(QCamera::CaptureMode::CaptureStillImage);
      g_camera.takeImage();
      

      Nothing happens. I didn't get to

      void Camera::processCapturedImage(int requestId, const QImage& img)
      

      or

      void Camera::imageSaved(int id, const QString &fileName)
      

      How do I know where is the image (if it was taken at all)?

      jsulmJ Offline
      jsulmJ Offline
      jsulm
      Lifetime Qt Champion
      wrote on last edited by
      #20

      @jenya7 Did you connect a slot to https://doc.qt.io/qt-5/qcamera.html#errorOccurred to see whether you get any errors? Same for https://doc.qt.io/qt-5/qcameraimagecapture.html#error-1
      You can get the cptured image using this signal: https://doc.qt.io/qt-5/qcameraimagecapture.html#imageAvailable

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

      J 1 Reply Last reply
      0
      • jsulmJ jsulm

        @jenya7 Did you connect a slot to https://doc.qt.io/qt-5/qcamera.html#errorOccurred to see whether you get any errors? Same for https://doc.qt.io/qt-5/qcameraimagecapture.html#error-1
        You can get the cptured image using this signal: https://doc.qt.io/qt-5/qcameraimagecapture.html#imageAvailable

        J Offline
        J Offline
        jenya7
        wrote on last edited by jenya7
        #21

        @jsulm said in A camera problem.:

        @jenya7 Did you connect a slot to https://doc.qt.io/qt-5/qcamera.html#errorOccurred to see whether you get any errors? Same for https://doc.qt.io/qt-5/qcameraimagecapture.html#error-1
        You can get the cptured image using this signal: https://doc.qt.io/qt-5/qcameraimagecapture.html#imageAvailable

        this is what I have

        connect(m_imageCapture.data(), &QCameraImageCapture::readyForCaptureChanged, this, &Camera::readyForCapture);
        connect(m_imageCapture.data(), &QCameraImageCapture::imageCaptured, this, &Camera::processCapturedImage);
        connect(m_imageCapture.data(), &QCameraImageCapture::imageSaved, this, &Camera::imageSaved);
        connect(m_imageCapture.data(), QOverload<int, QCameraImageCapture::Error, const QString &>::of(&QCameraImageCapture::error),
                    this, &Camera::displayCaptureError);
        
        jsulmJ 1 Reply Last reply
        0
        • J jenya7

          @jsulm said in A camera problem.:

          @jenya7 Did you connect a slot to https://doc.qt.io/qt-5/qcamera.html#errorOccurred to see whether you get any errors? Same for https://doc.qt.io/qt-5/qcameraimagecapture.html#error-1
          You can get the cptured image using this signal: https://doc.qt.io/qt-5/qcameraimagecapture.html#imageAvailable

          this is what I have

          connect(m_imageCapture.data(), &QCameraImageCapture::readyForCaptureChanged, this, &Camera::readyForCapture);
          connect(m_imageCapture.data(), &QCameraImageCapture::imageCaptured, this, &Camera::processCapturedImage);
          connect(m_imageCapture.data(), &QCameraImageCapture::imageSaved, this, &Camera::imageSaved);
          connect(m_imageCapture.data(), QOverload<int, QCameraImageCapture::Error, const QString &>::of(&QCameraImageCapture::error),
                      this, &Camera::displayCaptureError);
          
          jsulmJ Offline
          jsulmJ Offline
          jsulm
          Lifetime Qt Champion
          wrote on last edited by
          #22

          @jenya7 So, what about trying https://doc.qt.io/qt-5/qcameraimagecapture.html#imageAvailable ?

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

          J 1 Reply Last reply
          0
          • jsulmJ jsulm

            @jenya7 So, what about trying https://doc.qt.io/qt-5/qcameraimagecapture.html#imageAvailable ?

            J Offline
            J Offline
            jenya7
            wrote on last edited by jenya7
            #23

            @jsulm said in A camera problem.:

            @jenya7 So, what about trying https://doc.qt.io/qt-5/qcameraimagecapture.html#imageAvailable ?

            I did in Camera::setCamera

            connect(m_imageCapture.data(), &QCameraImageCapture::imageAvailable, this, &Camera::ImageAvailable);
            

            and then

            void Camera::ImageAvailable(int id, const QVideoFrame &frame)
            {
                 qDebug() <<  id;
                 //qDebug() << frame->???;
            }
            

            I also added

            void Camera::displayCameraError()
            {
                //QMessageBox::warning(this, tr("Camera Error"), m_camera->errorString());
                qDebug() << "Camera Error: " + m_camera->errorString() + "\n";
            }
            
            void Camera::displayCaptureError(int id, const QCameraImageCapture::Error error, const QString &errorString)
            {
                Q_UNUSED(id);
                Q_UNUSED(error);
                qDebug() << "Image Capture Error: " + errorString;
                m_isCapturingImage = false;
            }
            

            and when I do

            g_camera.SetCaptureMode(QCamera::CaptureMode::CaptureStillImage);
            g_camera.takeImage();
            

            I get

            "Image Capture Error: Camera not ready"
            

            How can I know a reason why the camera isn't ready?

            jsulmJ 1 Reply Last reply
            0
            • J jenya7

              @jsulm said in A camera problem.:

              @jenya7 So, what about trying https://doc.qt.io/qt-5/qcameraimagecapture.html#imageAvailable ?

              I did in Camera::setCamera

              connect(m_imageCapture.data(), &QCameraImageCapture::imageAvailable, this, &Camera::ImageAvailable);
              

              and then

              void Camera::ImageAvailable(int id, const QVideoFrame &frame)
              {
                   qDebug() <<  id;
                   //qDebug() << frame->???;
              }
              

              I also added

              void Camera::displayCameraError()
              {
                  //QMessageBox::warning(this, tr("Camera Error"), m_camera->errorString());
                  qDebug() << "Camera Error: " + m_camera->errorString() + "\n";
              }
              
              void Camera::displayCaptureError(int id, const QCameraImageCapture::Error error, const QString &errorString)
              {
                  Q_UNUSED(id);
                  Q_UNUSED(error);
                  qDebug() << "Image Capture Error: " + errorString;
                  m_isCapturingImage = false;
              }
              

              and when I do

              g_camera.SetCaptureMode(QCamera::CaptureMode::CaptureStillImage);
              g_camera.takeImage();
              

              I get

              "Image Capture Error: Camera not ready"
              

              How can I know a reason why the camera isn't ready?

              jsulmJ Offline
              jsulmJ Offline
              jsulm
              Lifetime Qt Champion
              wrote on last edited by
              #24

              @jenya7 Did you call

              camera->setCaptureMode(QCamera::CaptureStillImage);
              camera->start();
              //on half pressed shutter button
              camera->searchAndLock();
              
              //on shutter button pressed
              imageCapture->capture();
              

              like shown in https://doc.qt.io/qt-5/qcameraimagecapture.html ?

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

              J 1 Reply Last reply
              0
              • jsulmJ jsulm

                @jenya7 Did you call

                camera->setCaptureMode(QCamera::CaptureStillImage);
                camera->start();
                //on half pressed shutter button
                camera->searchAndLock();
                
                //on shutter button pressed
                imageCapture->capture();
                

                like shown in https://doc.qt.io/qt-5/qcameraimagecapture.html ?

                J Offline
                J Offline
                jenya7
                wrote on last edited by jenya7
                #25

                @jsulm said in A camera problem.:

                @jenya7 Did you call

                camera->setCaptureMode(QCamera::CaptureStillImage);
                camera->start();
                //on half pressed shutter button
                camera->searchAndLock();
                
                //on shutter button pressed
                imageCapture->capture();
                

                like shown in https://doc.qt.io/qt-5/qcameraimagecapture.html ?

                I thought

                void Camera::takeImage()
                {
                    m_isCapturingImage = true;
                    m_imageCapture->capture();
                }
                

                handles all this, kinda higher layer that wraps all together.
                and what is
                //on half pressed shutter button
                //on shutter button pressed
                I don't have any buttons. my app is not widget controlled. all commands issued from a command line.
                I took a widget camera example (from Examples) and removed all UI related staff.

                jsulmJ 1 Reply Last reply
                0
                • J jenya7

                  @jsulm said in A camera problem.:

                  @jenya7 Did you call

                  camera->setCaptureMode(QCamera::CaptureStillImage);
                  camera->start();
                  //on half pressed shutter button
                  camera->searchAndLock();
                  
                  //on shutter button pressed
                  imageCapture->capture();
                  

                  like shown in https://doc.qt.io/qt-5/qcameraimagecapture.html ?

                  I thought

                  void Camera::takeImage()
                  {
                      m_isCapturingImage = true;
                      m_imageCapture->capture();
                  }
                  

                  handles all this, kinda higher layer that wraps all together.
                  and what is
                  //on half pressed shutter button
                  //on shutter button pressed
                  I don't have any buttons. my app is not widget controlled. all commands issued from a command line.
                  I took a widget camera example (from Examples) and removed all UI related staff.

                  jsulmJ Offline
                  jsulmJ Offline
                  jsulm
                  Lifetime Qt Champion
                  wrote on last edited by
                  #26

                  @jenya7 said in A camera problem.:

                  I don't have any buttons.

                  These comments simply tell you that these methods simulate these buttons.
                  So, yes you have to set the capture mode, start the camera, call searchAndLock and then capture.

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

                  J 1 Reply Last reply
                  0
                  • jsulmJ jsulm

                    @jenya7 said in A camera problem.:

                    I don't have any buttons.

                    These comments simply tell you that these methods simulate these buttons.
                    So, yes you have to set the capture mode, start the camera, call searchAndLock and then capture.

                    J Offline
                    J Offline
                    jenya7
                    wrote on last edited by
                    #27

                    @jsulm said in A camera problem.:

                    @jenya7 said in A camera problem.:

                    I don't have any buttons.

                    These comments simply tell you that these methods simulate these buttons.
                    So, yes you have to set the capture mode, start the camera, call searchAndLock and then capture.

                    I changed to

                    void Camera::takeImage()
                    {
                        m_camera->start();
                        m_camera->searchAndLock();
                    
                        m_isCapturingImage = true;
                        m_imageCapture->capture();
                    }
                    

                    I still have
                    "Image Capture Error: Camera not ready"
                    Do I need to set a Viewfinder?
                    I commented out those lines

                    //QCameraViewfinder *v_finder = new QCameraViewfinder();
                    //v_finder->setFixedSize(240, 320);
                    //v_finder->show();
                    //v_finder->setAttribute(Qt::WA_NoSystemBackground);
                    //m_camera->setViewfinder(v_finder);
                    

                    cause I get an exception on
                    QCameraViewfinder *v_finder = new QCameraViewfinder();

                    jsulmJ 1 Reply Last reply
                    0
                    • J jenya7

                      @jsulm said in A camera problem.:

                      @jenya7 said in A camera problem.:

                      I don't have any buttons.

                      These comments simply tell you that these methods simulate these buttons.
                      So, yes you have to set the capture mode, start the camera, call searchAndLock and then capture.

                      I changed to

                      void Camera::takeImage()
                      {
                          m_camera->start();
                          m_camera->searchAndLock();
                      
                          m_isCapturingImage = true;
                          m_imageCapture->capture();
                      }
                      

                      I still have
                      "Image Capture Error: Camera not ready"
                      Do I need to set a Viewfinder?
                      I commented out those lines

                      //QCameraViewfinder *v_finder = new QCameraViewfinder();
                      //v_finder->setFixedSize(240, 320);
                      //v_finder->show();
                      //v_finder->setAttribute(Qt::WA_NoSystemBackground);
                      //m_camera->setViewfinder(v_finder);
                      

                      cause I get an exception on
                      QCameraViewfinder *v_finder = new QCameraViewfinder();

                      jsulmJ Offline
                      jsulmJ Offline
                      jsulm
                      Lifetime Qt Champion
                      wrote on last edited by
                      #28

                      @jenya7 For capturing images view finder should not be needed.
                      But you could try to enable it to see whether your camera works at all in Qt.
                      What exception do you get?

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

                      J 1 Reply Last reply
                      0
                      • jsulmJ jsulm

                        @jenya7 For capturing images view finder should not be needed.
                        But you could try to enable it to see whether your camera works at all in Qt.
                        What exception do you get?

                        J Offline
                        J Offline
                        jenya7
                        wrote on last edited by
                        #29

                        @jsulm said in A camera problem.:

                        @jenya7 For capturing images view finder should not be needed.
                        But you could try to enable it to see whether your camera works at all in Qt.
                        What exception do you get?

                        I get
                        The inferior stopped because it received a signal from the operating system.
                        Signal name: SIGABRT
                        Signal meaning: Aborted

                        jsulmJ 1 Reply Last reply
                        0
                        • J jenya7

                          @jsulm said in A camera problem.:

                          @jenya7 For capturing images view finder should not be needed.
                          But you could try to enable it to see whether your camera works at all in Qt.
                          What exception do you get?

                          I get
                          The inferior stopped because it received a signal from the operating system.
                          Signal name: SIGABRT
                          Signal meaning: Aborted

                          jsulmJ Offline
                          jsulmJ Offline
                          jsulm
                          Lifetime Qt Champion
                          wrote on last edited by
                          #30

                          @jenya7 Please run through debugger and post the stack trace.
                          Also, you should post your current code with enabled viewfinder.

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

                          J 1 Reply Last reply
                          0
                          • jsulmJ jsulm

                            @jenya7 Please run through debugger and post the stack trace.
                            Also, you should post your current code with enabled viewfinder.

                            J Offline
                            J Offline
                            jenya7
                            wrote on last edited by
                            #31

                            @jsulm said in A camera problem.:

                            @jenya7 Please run through debugger and post the stack trace.
                            Also, you should post your current code with enabled viewfinder.

                            void Camera::setCamera(const QCameraInfo &cameraInfo)
                            {
                                m_camera.reset(new QCamera(cameraInfo));
                            
                                connect(m_camera.data(), &QCamera::stateChanged, this, &Camera::updateCameraState);
                                connect(m_camera.data(), QOverload<QCamera::Error>::of(&QCamera::error), this, &Camera::displayCameraError);
                            
                                m_mediaRecorder.reset(new QMediaRecorder(m_camera.data()));
                                connect(m_mediaRecorder.data(), &QMediaRecorder::stateChanged, this, &Camera::updateRecorderState);
                            
                                m_imageCapture.reset(new QCameraImageCapture(m_camera.data()));
                            
                                connect(m_mediaRecorder.data(), &QMediaRecorder::durationChanged, this, &Camera::updateRecordTime);
                                connect(m_mediaRecorder.data(), QOverload<QMediaRecorder::Error>::of(&QMediaRecorder::error),
                                        this, &Camera::displayRecorderError);
                            
                                m_mediaRecorder->setMetaData(QMediaMetaData::Title, QVariant(QLatin1String("Test Title")));
                            
                                //connect(ui->exposureCompensation, &QAbstractSlider::valueChanged, this, &Camera::setExposureCompensation);
                            
                            //here the exception occurs
                               QCameraViewfinder *v_finder = new QCameraViewfinder();
                                //v_finder->setFixedSize(240, 320);
                                //v_finder->show();
                                v_finder->setAttribute(Qt::WA_NoSystemBackground);
                                m_camera->setViewfinder(v_finder);
                            
                                updateCameraState(m_camera->state());
                                updateLockStatus(m_camera->lockStatus(), QCamera::UserRequest);
                                updateRecorderState(m_mediaRecorder->state());
                            
                                connect(m_imageCapture.data(), &QCameraImageCapture::readyForCaptureChanged, this, &Camera::readyForCapture);
                                connect(m_imageCapture.data(), &QCameraImageCapture::imageCaptured, this, &Camera::processCapturedImage);
                                connect(m_imageCapture.data(), &QCameraImageCapture::imageSaved, this, &Camera::imageSaved);
                                connect(m_imageCapture.data(), QOverload<int, QCameraImageCapture::Error, const QString &>::of(&QCameraImageCapture::error),
                                        this, &Camera::displayCaptureError);
                            
                                connect(m_imageCapture.data(), &QCameraImageCapture::imageAvailable, this, &Camera::ImageAvailable);
                            
                                connect(m_camera.data(), QOverload<QCamera::LockStatus, QCamera::LockChangeReason>::of(&QCamera::lockStatusChanged),
                                        this, &Camera::updateLockStatus);
                            
                                //ui->captureWidget->setTabEnabled(0, (m_camera->isCaptureModeSupported(QCamera::CaptureStillImage)));
                                //ui->captureWidget->setTabEnabled(1, (m_camera->isCaptureModeSupported(QCamera::CaptureVideo)));
                            
                                updateCaptureMode(0);
                                m_camera->start();
                            }
                            

                            and a call stack

                            1  __GI_raise                                                  raise.c      50  0xb5830f14 
                            2  __GI_abort                                                  abort.c      79  0xb581c230 
                            3  QMessageLogger::fatal(const char *, ...) const                               0xb5c1c004 
                            4  QWidgetPrivate::QWidgetPrivate(int)                                          0xb698e204 
                            5  QWidget::QWidget(QWidget *, QFlags<Qt::WindowType>)                          0xb69ab42c 
                            6  QVideoWidget::QVideoWidget(QVideoWidgetPrivate&, QWidget *)                  0xb6f3ed70 
                            7  QCameraViewfinder::QCameraViewfinder(QWidget *)                              0xb6f388f4 
                            8  Camera::setCamera                                           camera.cpp   148 0x5a000        //this line is focused
                            9  Camera::Camera                                              camera.cpp   112 0x599ec    
                            10 __static_initialization_and_destruction_0                   camera.cpp   69  0x5bd58    
                            11 _GLOBAL__sub_I_camera.cpp(void)                             camera.cpp   544 0x5bdb4    
                            12 __libc_csu_init                                                              0xbed54    
                            13 __libc_start_main                                           libc-start.c 264 0xb581c6ac 
                            14 _start        
                            
                            jsulmJ 1 Reply Last reply
                            0
                            • J jenya7

                              @jsulm said in A camera problem.:

                              @jenya7 Please run through debugger and post the stack trace.
                              Also, you should post your current code with enabled viewfinder.

                              void Camera::setCamera(const QCameraInfo &cameraInfo)
                              {
                                  m_camera.reset(new QCamera(cameraInfo));
                              
                                  connect(m_camera.data(), &QCamera::stateChanged, this, &Camera::updateCameraState);
                                  connect(m_camera.data(), QOverload<QCamera::Error>::of(&QCamera::error), this, &Camera::displayCameraError);
                              
                                  m_mediaRecorder.reset(new QMediaRecorder(m_camera.data()));
                                  connect(m_mediaRecorder.data(), &QMediaRecorder::stateChanged, this, &Camera::updateRecorderState);
                              
                                  m_imageCapture.reset(new QCameraImageCapture(m_camera.data()));
                              
                                  connect(m_mediaRecorder.data(), &QMediaRecorder::durationChanged, this, &Camera::updateRecordTime);
                                  connect(m_mediaRecorder.data(), QOverload<QMediaRecorder::Error>::of(&QMediaRecorder::error),
                                          this, &Camera::displayRecorderError);
                              
                                  m_mediaRecorder->setMetaData(QMediaMetaData::Title, QVariant(QLatin1String("Test Title")));
                              
                                  //connect(ui->exposureCompensation, &QAbstractSlider::valueChanged, this, &Camera::setExposureCompensation);
                              
                              //here the exception occurs
                                 QCameraViewfinder *v_finder = new QCameraViewfinder();
                                  //v_finder->setFixedSize(240, 320);
                                  //v_finder->show();
                                  v_finder->setAttribute(Qt::WA_NoSystemBackground);
                                  m_camera->setViewfinder(v_finder);
                              
                                  updateCameraState(m_camera->state());
                                  updateLockStatus(m_camera->lockStatus(), QCamera::UserRequest);
                                  updateRecorderState(m_mediaRecorder->state());
                              
                                  connect(m_imageCapture.data(), &QCameraImageCapture::readyForCaptureChanged, this, &Camera::readyForCapture);
                                  connect(m_imageCapture.data(), &QCameraImageCapture::imageCaptured, this, &Camera::processCapturedImage);
                                  connect(m_imageCapture.data(), &QCameraImageCapture::imageSaved, this, &Camera::imageSaved);
                                  connect(m_imageCapture.data(), QOverload<int, QCameraImageCapture::Error, const QString &>::of(&QCameraImageCapture::error),
                                          this, &Camera::displayCaptureError);
                              
                                  connect(m_imageCapture.data(), &QCameraImageCapture::imageAvailable, this, &Camera::ImageAvailable);
                              
                                  connect(m_camera.data(), QOverload<QCamera::LockStatus, QCamera::LockChangeReason>::of(&QCamera::lockStatusChanged),
                                          this, &Camera::updateLockStatus);
                              
                                  //ui->captureWidget->setTabEnabled(0, (m_camera->isCaptureModeSupported(QCamera::CaptureStillImage)));
                                  //ui->captureWidget->setTabEnabled(1, (m_camera->isCaptureModeSupported(QCamera::CaptureVideo)));
                              
                                  updateCaptureMode(0);
                                  m_camera->start();
                              }
                              

                              and a call stack

                              1  __GI_raise                                                  raise.c      50  0xb5830f14 
                              2  __GI_abort                                                  abort.c      79  0xb581c230 
                              3  QMessageLogger::fatal(const char *, ...) const                               0xb5c1c004 
                              4  QWidgetPrivate::QWidgetPrivate(int)                                          0xb698e204 
                              5  QWidget::QWidget(QWidget *, QFlags<Qt::WindowType>)                          0xb69ab42c 
                              6  QVideoWidget::QVideoWidget(QVideoWidgetPrivate&, QWidget *)                  0xb6f3ed70 
                              7  QCameraViewfinder::QCameraViewfinder(QWidget *)                              0xb6f388f4 
                              8  Camera::setCamera                                           camera.cpp   148 0x5a000        //this line is focused
                              9  Camera::Camera                                              camera.cpp   112 0x599ec    
                              10 __static_initialization_and_destruction_0                   camera.cpp   69  0x5bd58    
                              11 _GLOBAL__sub_I_camera.cpp(void)                             camera.cpp   544 0x5bdb4    
                              12 __libc_csu_init                                                              0xbed54    
                              13 __libc_start_main                                           libc-start.c 264 0xb581c6ac 
                              14 _start        
                              
                              jsulmJ Offline
                              jsulmJ Offline
                              jsulm
                              Lifetime Qt Champion
                              wrote on last edited by
                              #32

                              @jenya7 I'm confused by the code you posted: sometimes you use m_camera. and sometimes m_camera->! How can this even compile?!

                              Try to set a parent on QCameraViewfinder to see whether it makes a difference.

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

                              J 1 Reply Last reply
                              0
                              • jsulmJ jsulm

                                @jenya7 I'm confused by the code you posted: sometimes you use m_camera. and sometimes m_camera->! How can this even compile?!

                                Try to set a parent on QCameraViewfinder to see whether it makes a difference.

                                J Offline
                                J Offline
                                jenya7
                                wrote on last edited by jenya7
                                #33

                                @jsulm said in A camera problem.:

                                @jenya7 I'm confused by the code you posted: sometimes you use m_camera. and sometimes m_camera->! How can this even compile?!

                                Try to set a parent on QCameraViewfinder to see whether it makes a difference.

                                Hmm..It's an example from the official Qt/Examples folder. I guess those with a dot - the intrinsic methods, not from a Camera class.

                                for example - m_camera.reset
                                from - C:\Qt\5.12.0\mingw73_64\include\QtCore\qscopedpointer.h

                                jsulmJ 1 Reply Last reply
                                0
                                • J jenya7

                                  @jsulm said in A camera problem.:

                                  @jenya7 I'm confused by the code you posted: sometimes you use m_camera. and sometimes m_camera->! How can this even compile?!

                                  Try to set a parent on QCameraViewfinder to see whether it makes a difference.

                                  Hmm..It's an example from the official Qt/Examples folder. I guess those with a dot - the intrinsic methods, not from a Camera class.

                                  for example - m_camera.reset
                                  from - C:\Qt\5.12.0\mingw73_64\include\QtCore\qscopedpointer.h

                                  jsulmJ Offline
                                  jsulmJ Offline
                                  jsulm
                                  Lifetime Qt Champion
                                  wrote on last edited by
                                  #34

                                  @jenya7 No, this belongs to C++ basics: if m_camera is a pointer then you have to use -> if it is not a pointer then you have to use dot. So, what is m_camera in YOUR code?

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

                                  J 1 Reply Last reply
                                  0
                                  • jsulmJ jsulm

                                    @jenya7 No, this belongs to C++ basics: if m_camera is a pointer then you have to use -> if it is not a pointer then you have to use dot. So, what is m_camera in YOUR code?

                                    J Offline
                                    J Offline
                                    jenya7
                                    wrote on last edited by jenya7
                                    #35

                                    @jsulm said in A camera problem.:

                                    @jenya7 No, this belongs to C++ basics: if m_camera is a pointer then you have to use -> if it is not a pointer then you have to use dot. So, what is m_camera in YOUR code?

                                    in camera.h

                                    class Camera : public QMainWindow
                                    {
                                        Q_OBJECT
                                    
                                    public:
                                        Camera(QObject *parent = nullptr);
                                    
                                         void takeImage();
                                    
                                    private slots:
                                        void setCamera(const QCameraInfo &cameraInfo);
                                    
                                        void startCamera();
                                        void stopCamera();
                                    
                                        void record();
                                        void pause();
                                        void stop();
                                        void setMuted(bool);
                                    
                                        void toggleLock();
                                        void displayCaptureError(int, QCameraImageCapture::Error, const QString &errorString);
                                    
                                        void configureCaptureSettings();
                                        void configureVideoSettings();
                                        void configureImageSettings();
                                        void displayRecorderError();
                                        void displayCameraError();
                                    
                                        void updateCameraDevice(QAction *action);
                                    
                                        void updateCameraState(QCamera::State);
                                        void updateCaptureMode();
                                        void updateRecorderState(QMediaRecorder::State state);
                                        void setExposureCompensation(int index);
                                    
                                        void updateRecordTime();
                                    
                                        void processCapturedImage(int requestId, const QImage &img);
                                        void updateLockStatus(QCamera::LockStatus, QCamera::LockChangeReason);
                                    
                                        void displayViewfinder();
                                        void displayCapturedImage();
                                    
                                        void readyForCapture(bool ready);
                                        void imageSaved(int id, const QString &fileName);
                                    
                                    protected:
                                        void keyPressEvent(QKeyEvent *event) override;
                                        void keyReleaseEvent(QKeyEvent *event) override;
                                        void closeEvent(QCloseEvent *event) override;
                                    
                                    private:
                                        Ui::Camera *ui;
                                    
                                        QScopedPointer<QCamera> m_camera;
                                    
                                        QScopedPointer<QCameraImageCapture> m_imageCapture;
                                        QScopedPointer<QMediaRecorder> m_mediaRecorder;
                                    
                                        QImageEncoderSettings m_imageSettings;
                                        QAudioEncoderSettings m_audioSettings;
                                        QVideoEncoderSettings m_videoSettings;
                                        QString m_videoContainerFormat;
                                        bool m_isCapturingImage = false;
                                        bool m_applicationExiting = false;
                                    };
                                    
                                    

                                    It's a private member initialized after the camera found in a constructor.

                                    Camera::Camera(QObject *parent) : QObject(parent) 
                                    {
                                          //some code
                                          if (cameraInfo == QCameraInfo::defaultCamera())
                                                  videoDeviceAction->setChecked(true);
                                    
                                           setCamera(QCameraInfo::defaultCamera());
                                    }
                                    
                                    jsulmJ 1 Reply Last reply
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                                    • J jenya7

                                      @jsulm said in A camera problem.:

                                      @jenya7 No, this belongs to C++ basics: if m_camera is a pointer then you have to use -> if it is not a pointer then you have to use dot. So, what is m_camera in YOUR code?

                                      in camera.h

                                      class Camera : public QMainWindow
                                      {
                                          Q_OBJECT
                                      
                                      public:
                                          Camera(QObject *parent = nullptr);
                                      
                                           void takeImage();
                                      
                                      private slots:
                                          void setCamera(const QCameraInfo &cameraInfo);
                                      
                                          void startCamera();
                                          void stopCamera();
                                      
                                          void record();
                                          void pause();
                                          void stop();
                                          void setMuted(bool);
                                      
                                          void toggleLock();
                                          void displayCaptureError(int, QCameraImageCapture::Error, const QString &errorString);
                                      
                                          void configureCaptureSettings();
                                          void configureVideoSettings();
                                          void configureImageSettings();
                                          void displayRecorderError();
                                          void displayCameraError();
                                      
                                          void updateCameraDevice(QAction *action);
                                      
                                          void updateCameraState(QCamera::State);
                                          void updateCaptureMode();
                                          void updateRecorderState(QMediaRecorder::State state);
                                          void setExposureCompensation(int index);
                                      
                                          void updateRecordTime();
                                      
                                          void processCapturedImage(int requestId, const QImage &img);
                                          void updateLockStatus(QCamera::LockStatus, QCamera::LockChangeReason);
                                      
                                          void displayViewfinder();
                                          void displayCapturedImage();
                                      
                                          void readyForCapture(bool ready);
                                          void imageSaved(int id, const QString &fileName);
                                      
                                      protected:
                                          void keyPressEvent(QKeyEvent *event) override;
                                          void keyReleaseEvent(QKeyEvent *event) override;
                                          void closeEvent(QCloseEvent *event) override;
                                      
                                      private:
                                          Ui::Camera *ui;
                                      
                                          QScopedPointer<QCamera> m_camera;
                                      
                                          QScopedPointer<QCameraImageCapture> m_imageCapture;
                                          QScopedPointer<QMediaRecorder> m_mediaRecorder;
                                      
                                          QImageEncoderSettings m_imageSettings;
                                          QAudioEncoderSettings m_audioSettings;
                                          QVideoEncoderSettings m_videoSettings;
                                          QString m_videoContainerFormat;
                                          bool m_isCapturingImage = false;
                                          bool m_applicationExiting = false;
                                      };
                                      
                                      

                                      It's a private member initialized after the camera found in a constructor.

                                      Camera::Camera(QObject *parent) : QObject(parent) 
                                      {
                                            //some code
                                            if (cameraInfo == QCameraInfo::defaultCamera())
                                                    videoDeviceAction->setChecked(true);
                                      
                                             setCamera(QCameraInfo::defaultCamera());
                                      }
                                      
                                      jsulmJ Offline
                                      jsulmJ Offline
                                      jsulm
                                      Lifetime Qt Champion
                                      wrote on last edited by
                                      #36

                                      @jenya7 OK, now it makes sense. Did you try to set parent on the viewfinder?

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

                                      J 1 Reply Last reply
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                                      • jsulmJ jsulm

                                        @jenya7 OK, now it makes sense. Did you try to set parent on the viewfinder?

                                        J Offline
                                        J Offline
                                        jenya7
                                        wrote on last edited by
                                        #37

                                        @jsulm said in A camera problem.:

                                        @jenya7 OK, now it makes sense. Did you try to set parent on the viewfinder?

                                        That's it - they use the widget int the app. What should I choose as a parent?

                                        jsulmJ 1 Reply Last reply
                                        0
                                        • J jenya7

                                          @jsulm said in A camera problem.:

                                          @jenya7 OK, now it makes sense. Did you try to set parent on the viewfinder?

                                          That's it - they use the widget int the app. What should I choose as a parent?

                                          jsulmJ Offline
                                          jsulmJ Offline
                                          jsulm
                                          Lifetime Qt Champion
                                          wrote on last edited by
                                          #38

                                          @jenya7 Do you have any other UI/widgets in your application?

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

                                          J 1 Reply Last reply
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