Вспышка с использованием видеокамеры

Question

Я нашел в Интернете учебник (http://www.locked.nl), чтобы постоянно включать вспышку. В методе StartRecording() я получаю исключение при вызове метода дважды. Также, как я могу остановить запись? Большое вам спасибо

У меня были эти 2 занятия.

Videocamera Класс:

public class VideoCamera 
{ 
    private object _videoCamera; 
    private PropertyInfo _videoCameraLampEnabledPropertyInfo; 
    private MethodInfo _videoCameraStartRecordingMethod; 
    private MethodInfo _videoCameraStopRecordingMethod; 
    private EventHandler _videoCameraInitialized; 

    public object InnerCameraObject 
    { 
     get { return _videoCamera; } 
    } 

    public bool LampEnabled 
    { 
     get { return (bool)_videoCameraLampEnabledPropertyInfo.GetGetMethod().Invoke(_videoCamera, new object[0]); } 
     set { _videoCameraLampEnabledPropertyInfo.GetSetMethod().Invoke(_videoCamera, new object[] { value }); } 
    } 

    public VideoCamera() 
    { 
     // Load the media extended assembly which contains the extended video camera object. 
     Assembly mediaExtendedAssembly = Assembly.Load("Microsoft.Phone.Media.Extended, Version=7.0.0.0, Culture=neutral, PublicKeyToken=24eec0d8c86cda1e"); 

     // Get the camera source type (primary camera). 
     Type cameraSourceType = mediaExtendedAssembly.GetType("Microsoft.Phone.CameraSource"); 
     FieldInfo field = cameraSourceType.GetField("PrimaryCamera"); 
     object cameraSource = Enum.ToObject(cameraSourceType, (int)field.GetValue(cameraSourceType)); 

     // Create the video camera object. 
     Type videoCameraType = mediaExtendedAssembly.GetType("Microsoft.Phone.VideoCamera"); 
     ConstructorInfo videoCameraConstructor = videoCameraType.GetConstructor(new Type[] { cameraSourceType }); 
     _videoCamera = videoCameraConstructor.Invoke(new object[] { cameraSource }); 

     // Set the properties and methods. 
     _videoCameraLampEnabledPropertyInfo = videoCameraType.GetProperty("LampEnabled"); 
     _videoCameraStartRecordingMethod = videoCameraType.GetMethod("StartRecording"); 
     _videoCameraStopRecordingMethod = videoCameraType.GetMethod("StopRecording"); 

     // Let the initialize event bubble through. 
     _videoCameraInitialized = new EventHandler(VideoCamera_Initialized); 
     MethodInfo addInitializedEventMethodInfo = videoCameraType.GetMethod("add_Initialized"); 
     addInitializedEventMethodInfo.Invoke(_videoCamera, new object[] { _videoCameraInitialized }); 
    } 

    /// <summary> 
    /// Occurs when the camera object has been initialized. 
    /// </summary> 
    public event EventHandler Initialized; 

    /// <summary> 
    /// Videoes the camera_ initialized. 
    /// </summary> 
    /// <param name="sender">The sender.</param> 
    /// <param name="eventArgs">The event args.</param> 
    private void VideoCamera_Initialized(object sender, object eventArgs) 
    { 
     if (Initialized != null) 
     { 
      Initialized.Invoke(this, new EventArgs()); 
     } 
    } 
    public bool IsRecording { get; private set; } 
    /// <summary> 
    /// Start recording. 
    /// </summary> 
    public void StartRecording() 
    { 
     _videoCameraStartRecordingMethod.Invoke(_videoCamera, new object[0]); 
    } 

    public void StopRecording() 
    { 

    } 
} 

}

и этот класс VideoCameraVisualizer

public class VideoCameraVisualizer : UserControl 
{ 
    private object _cameraVisualizer; 
    private MethodInfo _cameraVisualizerSetSourceMethod; 

    public VideoCameraVisualizer() 
    { 
     // Load the media extended assembly which contains the extended video camera object. 
     Assembly mediaExtendedAssembly = Assembly.Load("Microsoft.Phone.Media.Extended, Version=7.0.0.0, Culture=neutral, PublicKeyToken=24eec0d8c86cda1e"); 

     // Get the camera source type (primary camera). 
     Type cameraVisualizerType = mediaExtendedAssembly.GetType("Microsoft.Phone.CameraVisualizer"); 
     ConstructorInfo cameraVisualizerConstructor = cameraVisualizerType.GetConstructor(Type.EmptyTypes); 
     _cameraVisualizer = cameraVisualizerConstructor.Invoke(null); 

     // Set the properties and methods. 
     _cameraVisualizerSetSourceMethod = cameraVisualizerType.GetMethod("SetSource"); 
    } 

    public void SetSource(VideoCamera camera) 
    { 
     // Invoke the set source method on the camera visualizer object. 
     _cameraVisualizerSetSourceMethod.Invoke(_cameraVisualizer, new object[] { camera.InnerCameraObject }); 
    } 
} 

}

Теперь в MainPage у меня был код, который дает ошибку.

private void ContentPanel_Loaded(object sender, RoutedEventArgs e) 
    { 
     // Check to see if the camera is available on the device. 
     if (PhotoCamera.IsCameraTypeSupported(CameraType.Primary)) 
     { 
      // Use standard camera on back of device. 
      videoCam = new VideoCamera(); 

      // Event is fired when the video camera object has been initialized. 
      videoCam.Initialized += VideoCamera_Initialized; 

      // Add the photo camera to the video source 
      CameraVisualizer = new VideoCameraVisualizer(); 
      CameraVisualizer.SetSource(videoCam); 
     } 
     else MessageBox.Show("No Flash supported for Your Device. Try Color Button"); 
    } 

    private void VideoCamera_Initialized(object sender, EventArgs e) 
    { 
     videoCam.LampEnabled = true; 
     videoCam.StartRecording(); 
     count++; 
    } 



    private void FlashButton_Click(object sender, RoutedEventArgs e) 
    { 
     if (count % 2 == 0) 
     { 

      videoCam.LampEnabled = true; 
      videoCam.StartRecording(); 
     } 
     else 
     { 

      videoCam.LampEnabled = false; 
      videoCam.StopRecording(); 
     } 
     count++; 
    } 

} 

}

Answer 1

Совершенствуйте свои навыки Google! ;)

have a read of this SO post - How to stop led torch/flashlight app using Reflection in Windows Phone 7

P.S. Это хорошая запись в блоге о теме Using Cameras in Your Windows Phone Application