Windows Phone 开发——相机功能开发

using Microsoft.Phone.Tasks;

CameraCaptureTask cameraCaptureTask;

cameraCaptureTask = new CameraCaptureTask();
cameraCaptureTask.Completed += new EventHandler<PhotoResult>(cameraCaptureTask_Completed);

cameraCaptureTask.Show();

void cameraCaptureTask_Completed(object sender, PhotoResult e)
{
    if (e.TaskResult == TaskResult.OK)
    {
        MessageBox.Show(e.ChosenPhoto.Length.ToString());

//Code to display the photo on the page in an image control named myImage.
        //System.Windows.Media.Imaging.BitmapImage bmp = new System.Windows.Media.Imaging.BitmapImage();
        //bmp.SetSource(e.ChosenPhoto);
        //myImage.Source = bmp;
    }
}

<!-- 相机取景器 -->

        <Canvas x:Name="VideoCanvas">

            <Canvas.Background>

                <VideoBrush x:Name="BackgroundVideoBrush" >

                    <VideoBrush.RelativeTransform>

                        <CompositeTransform x:Name="VideoBrushTransform" CenterY="0.5" CenterX="0.5"/>

                    </VideoBrush.RelativeTransform>

                </VideoBrush>

            </Canvas.Background>

        </Canvas>

if ((PhotoCamera.IsCameraTypeSupported(CameraType.Primary) == true) ||

                 (PhotoCamera.IsCameraTypeSupported(CameraType.FrontFacing) == true))

            {

                // Initialize the camera, when available.

                if (PhotoCamera.IsCameraTypeSupported(CameraType.FrontFacing))

                {

                    // Use front-facing camera if available.

                    cam = new Microsoft.Devices.PhotoCamera(CameraType.FrontFacing);

                }

                else

                {

                    // Otherwise, use standard camera on back of device.

                    cam = new Microsoft.Devices.PhotoCamera(CameraType.Primary);

                }

    //Set the VideoBrush source to the camera.

                viewfinderBrush.SetSource(cam);

            }

            else

            {

                // The camera is not supported on the device.

                this.Dispatcher.BeginInvoke(delegate()

                {

                    // Write message.

                    txtDebug.Text = "A Camera is not available on this device.";

                });

 

                // Disable UI.

                ShutterButton.IsEnabled = false;

                FlashButton.IsEnabled = false;

                AFButton.IsEnabled = false;

                ResButton.IsEnabled = false;

            }

// Event is fired when the PhotoCamera object has been initialized.

                cam.Initialized += new EventHandler<Microsoft.Devices.CameraOperationCompletedEventArgs>(cam_Initialized);

 

                // Event is fired when the capture sequence is complete.

                cam.CaptureCompleted += new EventHandler<CameraOperationCompletedEventArgs>(cam_CaptureCompleted);

 

                // Event is fired when the capture sequence is complete and an image is available.

                cam.CaptureImageAvailable += new EventHandler<Microsoft.Devices.ContentReadyEventArgs>(cam_CaptureImageAvailable);

 

                // Event is fired when the capture sequence is complete and a thumbnail image is available.

                cam.CaptureThumbnailAvailable += new EventHandler<ContentReadyEventArgs>(cam_CaptureThumbnailAvailable);

 

                // The event is fired when auto-focus is complete.

                cam.AutoFocusCompleted += new EventHandler<CameraOperationCompletedEventArgs>(cam_AutoFocusCompleted);

 

                // The event is fired when the viewfinder is tapped (for focus).

                viewfinderCanvas.Tap += new EventHandler<GestureEventArgs>(focus_Tapped);

 

                // The event is fired when the shutter button receives a half press.

                CameraButtons.ShutterKeyHalfPressed += OnButtonHalfPress;

 

                // The event is fired when the shutter button receives a full press.

                CameraButtons.ShutterKeyPressed += OnButtonFullPress;

 

                // The event is fired when the shutter button is released.

                CameraButtons.ShutterKeyReleased += OnButtonRelease;

protected override void OnNavigatingFrom(System.Windows.Navigation.NavigatingCancelEventArgs e)

        {

            if (cam != null)

            {

                // Dispose camera to minimize power consumption and to expedite shutdown.

                cam.Dispose();

 

                // Release memory, ensure garbage collection.

                cam.Initialized -= cam_Initialized;

                cam.CaptureCompleted -= cam_CaptureCompleted;

                cam.CaptureImageAvailable -= cam_CaptureImageAvailable;

                cam.CaptureThumbnailAvailable -= cam_CaptureThumbnailAvailable;

                cam.AutoFocusCompleted -= cam_AutoFocusCompleted;

                CameraButtons.ShutterKeyHalfPressed -= OnButtonHalfPress;

                CameraButtons.ShutterKeyPressed -= OnButtonFullPress;

                CameraButtons.ShutterKeyReleased -= OnButtonRelease;

            }

        }

public void cam_CaptureThumbnailAvailable(object sender, ContentReadyEventArgs e)

        {

            string fileName = savedCounter + "_th.jpg";

 

            try

            {

                // Write message to UI thread.

                Deployment.Current.Dispatcher.BeginInvoke(delegate()

                {

                    txtDebug.Text = "Captured image available, saving thumbnail.";

                });

 

                // Save thumbnail as JPEG to isolated storage.

                using (IsolatedStorageFile isStore = IsolatedStorageFile.GetUserStoreForApplication())

                {

                    using (IsolatedStorageFileStream targetStream = isStore.OpenFile(fileName, FileMode.Create, FileAccess.Write))

                    {

                        // Initialize the buffer for 4KB disk pages.

                        byte[] readBuffer = new byte[4096];

                        int bytesRead = -1;

 

                        // Copy the thumbnail to isolated storage.

                        while ((bytesRead = e.ImageStream.Read(readBuffer, 0, readBuffer.Length)) > 0)

                        {

                            targetStream.Write(readBuffer, 0, bytesRead);

                        }

                    }

                }

 

                // Write message to UI thread.

                Deployment.Current.Dispatcher.BeginInvoke(delegate()

                {

                    txtDebug.Text = "Thumbnail has been saved to isolated storage.";

 

                });

            }

            finally

            {

                // Close image stream

                e.ImageStream.Close();

            }

        }