WP7上的CameraCaptureTask

Question

我想在WP7上使用CameraCaptureTask，以便从手机上获取图像并对其进行操作。我的代码是：

    CameraCaptureTask cameraCaptureTask;
    public MainPage()
    {
        InitializeComponent();

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

        }
        catch (System.InvalidOperationException ex)
        {
            MessageBox.Show(ex.Message);
        }

    }

    private void button1_Click(object sender, RoutedEventArgs e)
    {

        try
        {
            cameraCaptureTask.Show();

        }
        catch (System.InvalidOperationException ex)
        {
            MessageBox.Show(ex.Message);
        }

    }

    void cameraCaptureTask_Completed(object sender, PhotoResult e)
    {
        MessageBox.Show("event: " + e.TaskResult.ToString());
        if (e.TaskResult == TaskResult.OK)
        {                
            BitmapImage bmp = new BitmapImage();
            bmp.SetSource(e.ChosenPhoto);
            image1.Source = bmp;
        }
    }

}

问题是，每次我单击button1时，事件都会被引发，但值是TaskResult.Cancel instad of OK。此外，手机中没有显示摄像头。

有什么想法吗？谢谢

Answer 1

您是否在附加调试器的情况下运行？如果是这样，当您使用Zune软件连接到设备时，摄像机将无法工作。

如果您使用WPConnect工具进行连接，那么它应该可以工作。

Answer 2

你可以试试这个。

private void button1_Click(object sender, RoutedEventArgs e)
    {
        try
        {
            cameraCaptureTask = new CameraCaptureTask();
            cameraCaptureTask.Completed += new EventHandler<PhotoResult>(cameraCaptureTask_Completed);
            cameraCaptureTask.Show();
        }
        catch (System.InvalidOperationException ex)
        {
            MessageBox.Show(ex.Message);
        }
    }
   void cameraCaptureTask_Completed(object sender, PhotoResult e)
    {
        MessageBox.Show("event: " + e.TaskResult.ToString());
        if (e.TaskResult == TaskResult.OK)
        {                
            BitmapImage bmp = new BitmapImage();
            bmp.SetSource(e.ChosenPhoto);
            image1.Source = bmp;
        }
    }

Answer 3

尝尝这个。

void ctask_Completed(object sender, PhotoResult e)
{

    if (e.TaskResult == TaskResult.OK && e.ChosenPhoto != null)
    {

        //Take JPEG stream and decode into a WriteableBitmap object
        App.CapturedImage = PictureDecoder.DecodeJpeg(e.ChosenPhoto);


        //Collapse visibility on the progress bar once writeable bitmap is visible.
        progressBar1.Visibility = Visibility.Collapsed;


        //Populate image control with WriteableBitmap object.
        ImageMain.Source = App.CapturedImage;
    }

}