Question

如何在Windows Phone 7中以编程方式设置锁定屏幕图像？如果无法做到这一点，如何以编程方式将图像添加到相机胶卷？

Answer 1

不要认为你可以直接这样做，但你可以将图像保存到用户的图片中然后用户可以选择将图像用于锁定屏幕图像：

Photos, Photos, Photos - How To Save, Load And Iterate Pictures With Windows Phone 7

// Saves the WriteableBitmap encoded as JPEG to the Media library.
// The quality for JPEG encoding has to be in the range 0-100,
// where 100 is the best quality with the largest size.
void SaveToMediaLibrary(this WriteableBitmap bitmap, string name, int quality);

// Saves the WriteableBitmap encoded as JPEG to the Media library
// using the best quality of 100.
void SaveToMediaLibrary(this WriteableBitmap bitmap, string name);

Answer 2

我不知道您是否可以通过编程方式设置锁定屏幕图像。但是在Windows Phone OS 7.1（“Mango”）中，您可以使用 PhotoCamera 类以编程方式访问摄像机并使用<将捕获的图像保存到相机胶卷文件夹中strong> SavePictureToCameraRoll 方法。完整的详细信息包含在以下主题中：

How to: Create a Base Camera Application for Windows Phone

但基本上，只需在捕获完成后创建一个触发方法，然后为它启动事件处理程序。如果您可以保存JPEG，则可以直接将流写入库。

此代码显示初始化相机，连接事件处理程序，以及将相机Feed应用于名为 vewfinderBrush 的页面上的矩形对象：

    //Code for initialization, image availability events anbd setting the source for the viewfinder
    protected override void OnNavigatedTo(System.Windows.Navigation.NavigationEventArgs e)
    {

        // Initialize camera
        cam = new Microsoft.Devices.PhotoCamera();

        // Event is fired when the capture sequence is complete and an image is available.
        cam.CaptureImageAvailable += new EventHandler<Microsoft.Devices.ContentReadyEventArgs>(cam_CaptureImageAvailable);

        //Set the VideoBrush source to the camera.
        viewfinderBrush.SetSource(cam);
    }

photoCamera类在捕获时会生成两个图像：完整图像和缩略图。您可以使用名为 e 的ContentReadyEventArgs参数双向访问图像。如果您处理 CaptureImageAvailable 事件，则会获得完整图像。如果您捕获 CaptureThumbnailAvailable ，则会获得缩略图。

    // Informs when full resolution picture has been taken, saves to local media library        void cam_CaptureImageAvailable(object sender, Microsoft.Devices.ContentReadyEventArgs e)
    {

        try
        {
           // Save picture to the device media library.
            library.SavePictureToCameraRoll(fileName, e.ImageStream);
        }
        finally
        {
            // Close image stream
            e.ImageStream.Close();
        }

请注意，文档还显示将图像和缩略图写入隔离存储。

希望有所帮助。干杯

如何在Windows Phone 7中以编程方式设置锁定屏幕图像？

2 个答案: