How to copy the selected image from picture library to the images folder dynamically in the application?

问题

I am new to the windows phone 7 application development. I am accessing the picture library by using the PhotoChooserTask class. After selecting one of the picture from picture library I want to add that image (.jpg file) from picture library to the images folder of my application. How to do this ? I am using the following code

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);

            }
        } 
    }

I want to add the the selected image dynamically to images folder of my application. how to do this? Can you please provide me any code or link through which I can resolve the above issue ?

回答1:

Here's an example of saving the selected picture to IsolatedStorage and then reading it out to display it on the page:

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;
        }
    }
}

回答2:

You can refer to the RTM release notes on the revised Photo Chooser API or the doco a bit further down the page here.

How to: Create a Photo Extras Application for Windows Phone

回答3:

In fact, once you obtain the stream, you can convert it to byte and store locally. Here is what you should have in your Task_Completed event handler:

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);
    }
}

来源：https://stackoverflow.com/questions/4253438/how-to-copy-the-selected-image-from-picture-library-to-the-images-folder-dynamic

标签

silverlight

windows-phone-7