在silverlight中上傳時JPG損壞

Question

在CameraCaptureTask拍攝圖像後，應將其上傳到服務器。上傳的服務器端JPG似乎有正確的文件大小，但已損壞。此外，imageBuffer似乎將所有字節設置爲0.任何有關下面代碼錯誤的想法？

if (bitmapImage != null) { 
    // create WriteableBitmap object from captured BitmapImage 
    WriteableBitmap writeableBitmap = new WriteableBitmap(bitmapImage); 

    using (MemoryStream ms = new MemoryStream()) 
    { 
     writeableBitmap.SaveJpeg(ms, writeableBitmap.PixelWidth, writeableBitmap.PixelHeight, 0, 100); 

     imageBuffer = new byte[ms.Length]; 
     ms.Read(imageBuffer, 0, imageBuffer.Length); 
     ms.Dispose(); 
    }     
} 

Answer 1

SaveJpeg方法改變流的當前位置。爲了正確保存流的內容，您需要從頭開始讀取它（即將位置設置爲0）。試試這個：

if (bitmapImage != null) { 
    // create WriteableBitmap object from captured BitmapImage 
    WriteableBitmap writeableBitmap = new WriteableBitmap(bitmapImage); 

    using (MemoryStream ms = new MemoryStream()) 
    { 
     writeableBitmap.SaveJpeg(ms, writeableBitmap.PixelWidth, writeableBitmap.PixelHeight, 0, 100); 

     ms.Position = 0; 
     imageBuffer = new byte[ms.Length]; 
     ms.Read(imageBuffer, 0, imageBuffer.Length); 
     ms.Dispose(); 
    }     
}