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POTake a snapshot of using the rectangle in WP7
 

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    <p>Im working on a WP7-app where I would like to record video and before the video is saved take a snapshot of the video so that it could be used as a thumbnail picture. The thumbnail picture is temporary save in the isolated storage before it is used. For the camera I use a rectangle to record video and later I want to display the picture on the phone. The problem is that the picture is displays only a black screen. Even when i tried to save the picture in the media library the picture is also there displayed as black. What can be the cause of this problem and how do i solve it?</p> <p>I inserted the code below: </p> <p>Here is the rectangle where you capture the video with. </p> <pre><code> &lt;Rectangle x:Name="viewfinderRectangle" Width="640" Height="480" HorizontalAlignment="Left" Canvas.Left="80"/&gt; </code></pre> <p>Here is the code for taking the picture:</p> <pre><code>try { String tempJPEG = FOSConstants.TEMP_VIDEO_THUMBNAIL_NAME; var myStore = IsolatedStorageFile.GetUserStoreForApplication(); if (myStore.FileExists(tempJPEG)) { myStore.DeleteFile(tempJPEG); } IsolatedStorageFileStream myFileStream = myStore.CreateFile(tempJPEG); WriteableBitmap wb = new WriteableBitmap(viewfinderRectangle, null); wb.SaveJpeg(myFileStream, wb.PixelWidth, wb.PixelHeight, 0, 85); myFileStream.Close(); myFileStream.Close(); } catch (Exception ex) { MessageBox.Show(ex.Message, "Error saving snapshot", MessageBoxButton.OK); } </code></pre> <p>Here is the code for reading the thumbnail picture from the isolated storage: </p> <pre><code>private BitmapImage GetIsolatedStorageFile(string isolatedStorageFileName) { var bimg = new BitmapImage(); using (var store = IsolatedStorageFile.GetUserStoreForApplication()) { using (var stream = store.OpenFile(isolatedStorageFileName, FileMode.Open, FileAccess.Read)) { bimg.SetSource(stream); } } return bimg; } </code></pre> <p>Here is the image where I want to display my thumbnail in the GUI.</p> <pre><code>&lt;Image Width="180" Height="180" Stretch="Fill" Margin="24,0,0,0" Source="{Binding Path=ImageSoruce, Mode=TwoWay}" HorizontalAlignment="Left"/&gt; </code></pre>
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