Access to my camera not granted.

[Wunian]

Hello,
My environment is below,
Mac mini, MacOS M1 64bit, Sonoma 14.5
XCode: 15.2

The required usage description in my Info.plist is below,
<key>NSPhotoLibraryUsageDescription</key> <!-- added this for photo library permission -->
<string>Need library access to upload images</string>
<key>NSCameraUsageDescription</key> <!-- added this for camera permission -->
<string>Need camera access to take pictures</string>
<key>NSMicrophoneUsageDescription</key> <!-- added this for microphone permission -->
<string>Multimedia Example</string>

I use QCamera and QVideoSink for video streaming capturing,
if I use Qt 6.5.3, my application works fine;
but if I use Qt 6.6.3 and Qt 6.7.1, my application can not work with my camera due to the following message,
qt.permissions: Could not find permission plugin for QCameraPermission. Please make sure you have included the required usage description in your Info.plist.
Access to camera not granted.

May I know if I misunderstand something?

Thanks.
Have a nice day.

[Wunian]

Hello,
Here I answer this question by myself, hope my answer can help someone who also meets this issue.

1. Set QMAKE_INFO_PLIST in your pro file.
   Please refer https://doc.qt.io/qt-6/ios-platform-notes.html#info-plist-with-qmake

2. Make one function to check camera permission.
   For example,
   void MainWindow::checkCameraPermission(void)
   { // please refer https://code.qt.io/cgit/qt/qtmultimedia.git/tree/examples/multimedia/camera?h=6.7
   #if QT_CONFIG(permissions)

   QCameraPermission cameraPermission;
   switch (qApp->checkPermission(cameraPermission)) {
   case Qt::PermissionStatus::Undetermined:
   qApp->requestPermission(cameraPermission, this, &MainWindow::checkCameraPermission);
   return;
   case Qt::PermissionStatus::Denied:
   std::cout << "Camera permission is not granted!" << std::endl;
   return;
   case Qt::PermissionStatus::Granted:
   std::cout << "Camera permission is granted!" << std::endl;
   break;
   }

#endif
}

3. Make one function to check camera permission status.
   For example,
   void MainWindow::checkAuthorizationStatus(void)
   {
   #if QT_CONFIG(permissions)

   QCameraPermission cameraPermission;
   Qt::PermissionStatus auth_status = Qt::PermissionStatus::Undetermined;
   while(true)
   {
   QThread::msleep(1);
   auth_status = qApp->checkPermission(cameraPermission);

    if(auth_status == Qt::PermissionStatus::Undetermined)
        continue;
   
    break;
   

   }

#endif // if QT_CONFIG
}

4. Before searching your camera, call the following functions,
   checkCameraPermission();
   checkAuthorizationStatus();

At my side, this issue had been solved.

Thanks.
Have a nice day.

[JoeCFD]

https://forum.qt.io/topic/152364/issue-with-camerapermission-requests-on-ios-with-qt-6-6-1/5

[Wunian]

@JoeCFD
Thanks for your information.
I use qmake for my Qt project.
May I know if this issue can be solved?

Thanks.
Have a nice day.

[Wunian]

Hello,
Here I answer this question by myself, hope my answer can help someone who also meets this issue.

1. Set QMAKE_INFO_PLIST in your pro file.
   Please refer https://doc.qt.io/qt-6/ios-platform-notes.html#info-plist-with-qmake

2. Make one function to check camera permission.
   For example,
   void MainWindow::checkCameraPermission(void)
   { // please refer https://code.qt.io/cgit/qt/qtmultimedia.git/tree/examples/multimedia/camera?h=6.7
   #if QT_CONFIG(permissions)

   QCameraPermission cameraPermission;
   switch (qApp->checkPermission(cameraPermission)) {
   case Qt::PermissionStatus::Undetermined:
   qApp->requestPermission(cameraPermission, this, &MainWindow::checkCameraPermission);
   return;
   case Qt::PermissionStatus::Denied:
   std::cout << "Camera permission is not granted!" << std::endl;
   return;
   case Qt::PermissionStatus::Granted:
   std::cout << "Camera permission is granted!" << std::endl;
   break;
   }

#endif
}

3. Make one function to check camera permission status.
   For example,
   void MainWindow::checkAuthorizationStatus(void)
   {
   #if QT_CONFIG(permissions)

   QCameraPermission cameraPermission;
   Qt::PermissionStatus auth_status = Qt::PermissionStatus::Undetermined;
   while(true)
   {
   QThread::msleep(1);
   auth_status = qApp->checkPermission(cameraPermission);

    if(auth_status == Qt::PermissionStatus::Undetermined)
        continue;
   
    break;
   

   }

#endif // if QT_CONFIG
}

4. Before searching your camera, call the following functions,
   checkCameraPermission();
   checkAuthorizationStatus();

At my side, this issue had been solved.

Thanks.
Have a nice day.