Question

我是Windows Phone 7应用程序开发的新手。我正在使用PhotoChooserTask类访问图片库。从图片库中选择一张图片后，我想将图片库中的图片（.jpg文件）添加到我的应用程序的图片文件夹中。这该怎么做？我使用以下代码

public partial class MainPage : PhoneApplicationPage
    {

        PhotoChooserTask photoChooserTask; 
        // Constructor
        public MainPage()
        {
            InitializeComponent();
            photoChooserTask = new PhotoChooserTask();
            photoChooserTask.Completed += new EventHandler<PhotoResult>(photoChooserTask_Completed); 
         }

        private void button1_Click(object sender, RoutedEventArgs e)
        {
            photoChooserTask.Show();            
        }

        void photoChooserTask_Completed(object sender, PhotoResult e)
        {
            if (e.TaskResult == TaskResult.OK)
            {
                BitmapImage bmp = new BitmapImage();
                bmp.SetSource(e.ChosenPhoto);

            }
        } 
    }

我想将所选图像动态添加到我的应用程序的图像文件夹中。这该怎么做？能否请您提供我可以解决上述问题的任何代码或链接？

Answer 1

以下是将所选图片保存到IsolatedStorage然后将其读出以在页面上显示的示例：

void photoChooserTask_Completed(object sender, PhotoResult e)
{
    if (e.TaskResult == TaskResult.OK)
    {
        var contents = new byte[1024];

        using (var store = IsolatedStorageFile.GetUserStoreForApplication())
        {
            using (var local = new IsolatedStorageFileStream("image.jpg", FileMode.Create, store))
            {
                int bytes;
                while ((bytes = e.ChosenPhoto.Read(contents, 0, contents.Length)) > 0)
                {
                    local.Write(contents, 0, bytes);
                }
            }

            // Read the saved image back out
            var fileStream = store.OpenFile("image.jpg", FileMode.Open, FileAccess.Read);
            var imageAsBitmap = PictureDecoder.DecodeJpeg(fileStream);

            // Display the read image in a control on the page called 'MyImage'
            MyImage.Source = imageAsBitmap;
        }
    }
}

Answer 2

您可以在此处参考修订后的Photo Chooser API上的RTM release notes或doco。

How to: Create a Photo Extras Application for Windows Phone

Answer 3

实际上，一旦获得了流，就可以将其转换为byte并在本地存储。以下是Task_Completed事件处理程序中应该具有的内容：

using (MemoryStream stream = new MemoryStream())
{
    byte[] contents = new byte[1024];
    int bytes;

    while ((bytes = e.ChosenPhoto.Read(contents, 0, contents.Length)) > 0)
    {
        stream.Write(contents, 0, bytes);
    }

    using (var local = new IsolatedStorageFileStream("myImage.jpg", FileMode.Create, IsolatedStorageFile.GetUserStoreForApplication()))
    {
        local.Write(stream.GetBuffer(), 0, stream.GetBuffer().Length);
    }
}

如何在应用程序中动态地将所选图像从图片库复制到images文件夹？

3 个答案: