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POWindows Phone 7.1: Split byte[] image and convert to BitmapImage
 

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  1. POWindows Phone 7.1: Split byte[] image and convert to BitmapImage
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    <p>Edit: To those who need to blit an image(i.e. copy a part of a WriteableBitmap to another), you can use Buffer.BlockCopy and use WriteableBitmaps' Pixels int[] arrays as argument.</p> <p>I asked this question before: <a href="https://stackoverflow.com/questions/8754527/image-wont-load-completely-on-windows-phone-7-5">Image won&#39;t load completely on Windows Phone 7.5</a></p> <p>I've been working on this issue for several hours now and I've tried several things. I'm not familiar with image types etc. so it's possible that I'm missing a basic theory (like I cannot split a byte[] image and convert them into BitmapImage).</p> <p>What I'm trying to do is:</p> <ol> <li>Download an image(JPEG) from Web using WebClient.</li> <li>Decode the JPEG from the stream that WebClient returned to me using PictureDecoder.DecodeJpeg and get a WriteableBitmap object</li> <li>Convert WriteableBitmap.Pixels array from int[] to byte[]</li> <li>Split the byte[] array into several pieces, so they won't exceed 2000x2000 size limit</li> <li>Convert each piece to BitmapImage so I can use them in my WP7.1 Silverlight app.</li> </ol> <p>But I get an System.Exception with Unspecified error in System.Windows.dll in those lines:</p> <pre><code> firstImg.SetSource(ms); newImg.SetSource(ms2); </code></pre> <p>BTW, the jpeg I'm downloading is a valid jpeg, I can display it without trying to split it.</p> <p>Edit: Jpeg that I download is smaller than 2000 in width and bigger than 2000 in height.</p> <p>Here's my code:</p> <pre><code>private void wc_OpenReadCompleted(object sender, OpenReadCompletedEventArgs e) { WriteableBitmap rawImg = PictureDecoder.DecodeJpeg(e.Result); byte[] arr; int height = rawImg.PixelHeight; int count = 0; if (height &lt; 2000) images.Add(new MyImage(rawImg)); else { arr = ConvertToByte(rawImg); MemoryStream ms = new MemoryStream(); ms.Write(arr, 0, 4 * rawImg.PixelWidth * 2000); count++; BitmapImage firstImg = new BitmapImage(); firstImg.SetSource(ms); images.Add(new MyImage(firstImg)); while (height &gt; 2000) { MemoryStream ms2 = new MemoryStream(); ms2.Write(arr, count*2000, 4 * rawImg.PixelWidth * Math.Min(arr.Length - count*2000, 2000)); count++; height -= 2000; BitmapImage newImg = new BitmapImage(); newImg.SetSource(ms2); images.Add(new MyImage(newImg)); } } } private byte[] ConvertToByte(WriteableBitmap wb) { int w = wb.PixelWidth; int h = wb.PixelHeight; int[] p = wb.Pixels; int len = p.Length; byte[] result = new byte[4 * w * h]; for (int i = 0, j = 0; i &lt; len; i++, j += 4) { int color = p[i]; result[j + 0] = (byte)(color &gt;&gt; 24); result[j + 1] = (byte)(color &gt;&gt; 16); result[j + 2] = (byte)(color &gt;&gt; 8); result[j + 3] = (byte)(color); } return result; } </code></pre>
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