Downloading an Image from an external (Image) URL

The url has to be an Image URL, ending with jpeg, png, jpg, gif

Note:

1 ) The entire code has not be en implemented following the MVVM pattern Every thing has been done from the code behind just for example purpose.

2 ) The Project should also have a reference to * Microsoft.Xna.Framework.dll *

3 ) All the contents in the xaml Page should be places inside the       TAG

4 ) The example also Demonstrates the use of Regular Expression for Image URLs

Only two pages to design this simple application
1) MainPage.xaml  2) MainPage.xaml.cs

Code For:

MainPage.xaml.
 
    
        

            

            

        

    
 
 
MainPage.xaml.cs:
 
 
public partial class MainPage : PhoneApplicationPage
    {
        /// 
        /// Constructor to main page
        /// 
        public MainPage()
        {
            InitializeComponent();
        }

        /// 
        /// Call web client to read the data
        /// 
        /// Uri
        public void Fetch(Uri uri)
        {
            //web client to communicate with the specified URL
            WebClient webClient = new WebClient();

            //attach event of on read compleated
            webClient.OpenReadCompleted += this.ReadCompleted;

            //opeans a readable stream for the asynchronous call
            webClient.OpenReadAsync(uri);
        }

        /// 
        /// Executes when reading of the page has been compleated
        /// 
        /// object
        /// OpenReadCompletedEventArgs
        private void ReadCompleted(object sender, OpenReadCompletedEventArgs e)
        {
            Stream stream = e.Result;

            //create a bitmap image of the image from url
            BitmapImage bmp = new BitmapImage();
            bmp.SetSource(stream);

            //stream to rad Image Data
            using (MemoryStream streamImageData = new MemoryStream())
            {
                WriteableBitmap wbmp = new WriteableBitmap(bmp);

                //set target width and height to Save Image to media library
                wbmp.SaveJpeg(streamImageData, 300, 300, 0, 100);

                //set the position of the stream to beggning
                streamImageData.Seek(0, SeekOrigin.Begin);

                //save image in media library
                using (MediaLibrary mediaLibrary = new MediaLibrary())
                    mediaLibrary.SavePicture("Picture.jpg", streamImageData);
            }
        }

        /// 
        /// Click Event for download button
        /// 
        /// object
        /// RoutedEventArgs
        private void btnDownload_Click(object sender, RoutedEventArgs e)
        {
            //image url
            string strImageURL = wbGetImage.Source.ToString();

            //Check valid Image Url
            if (Regex.IsMatch(strImageURL, "http://(\\S+?)\\.(jpg|png|gif|jpeg)"))
            {

                //create new URL for the Image
                Uri imageURl = new Uri(wbGetImage.Source.ToString(), UriKind.Absolute);
                Fetch(imageURl);
            }
            else
            {
                MessageBox.Show("Invalid Image URL");
            }
        }
    } 

Now to view all the Images and your downloaded images from the device’s Media Library please go through the following Link :

http://www.ourgoalplan.com/KLMS/TipView.aspx?id=2994