發送圖像與從Windows Phone到Java服務器的Exif信息

我是Windows Phone（和StackOverflow tbh）編程中的新手。目前，我正在處理一個任務，該任務涉及將存儲在Windows Phone存儲中的圖像（使用Exif信息）發送到Java服務器。到目前爲止，我已經成功地從Windows Phone客戶端發送字節流，並在Java端構建圖像，但Exif信息不知何故丟失。我相信這只是我在Windows Phone上發送它導致問題的方式。非常感謝您的幫助或指導！這是我在Windows Phone客戶端代碼：發送圖像與從Windows Phone到Java服務器的Exif信息

// Windows Phone Client code (MainPage.xaml.cs) 
// This function is called when an image is selected from 
// the task PhotoChooserTask ptask, which brings 
// a popup that allows the user to choose an image 
// from the phone's storage 
void ptask_Completed(object sender, PhotoResult e) 
{ 
     if (e.TaskResult == TaskResult.OK && e.ChosenPhoto != null) 
     { 
      //Take JPEG stream and decode into a WriteableBitmap object 
      App.CapturedImage = PictureDecoder.DecodeJpeg(e.ChosenPhoto); 

      // Attempt to send the image 
      WriteableBitmap pic = new WriteableBitmap(App.CapturedImage); 
      MemoryStream stream = new MemoryStream(); 

      pic.SaveJpeg(stream, App.CapturedImage.PixelHeight, App.CapturedImage.PixelWidth, 0, 100); 
      stream.Seek(0, SeekOrigin.Begin); 
      client.Send(stream); 

      // Close the socket connection explicitly 
      client.Close(); 
     } 
    }

這裏是在SocketClient.cs

 public string Send(MemoryStream data) 
     { 
     byte[] msData = data.ToArray(); 

     if (_socket != null) 
     { 
      // Create SocketAsyncEventArgs context object 
      SocketAsyncEventArgs socketEventArg = new SocketAsyncEventArgs(); 

      // Set properties on context object 
      socketEventArg.RemoteEndPoint = _socket.RemoteEndPoint; 
      socketEventArg.UserToken = null; 

      socketEventArg.Completed += new EventHandler<SocketAsyncEventArgs>(delegate(object s, SocketAsyncEventArgs e) 
      { 
       _clientDone.Set(); 
      }); 

      // Add the data to be sent into the buffer 
      socketEventArg.SetBuffer(msData, 0, msData.Length); 

      // Sets the state of the event to nonsignaled, causing threads to block 
      _clientDone.Reset(); 

      // Make an asynchronous Send request over the socket 
      _socket.SendAsync(socketEventArg); 

     } 
     else 
     { 
      response = "Socket is not initialized"; 
     } 

     return response; 
    }

在Java服務器代碼，

public static void main(String[] args) { 
    ServerSocket serverSocket; 
    Socket client; 
    try { 
     serverSocket = new ServerSocket(PORT_NUMBER); 
     while (true) { 
      client = serverSocket.accept(); 

      // Extract exif info 
      InputStream inputStream = client.getInputStream(); 
      InputStream stream = new BufferedInputStream(inputStream); 

      // Create file from the inputStream 
      File file = new File("image.jpg"); 
      try { 
       OutputStream os = new FileOutputStream(file); 
       byte[] buffer = new byte[4096]; 
        for (int n; (n = stream.read(buffer)) != -1;) { 
         os.write(buffer, 0, n); 
        } 
       }

輸出的圖像是相同的從Windows手機發送的一個，沒有任何Exif信息。任何人都可以指出我做錯了什麼，導致信息丟失？我猜測是因爲我在Windows Phone代碼中調用了SaveJpeg函數，重寫了圖像文件並丟失了所有信息，但我不知道如何將圖像轉換爲字節並進行流式處理。

很多幫助表示讚賞！謝謝。

來源

2012-10-16 Yoshi3003

那你試試？ –

這可能有助於將代碼簡化爲一個更小，更簡單的測試用例來演示您的問題。 –

@RichardPena所以我創建了一個WriteableBitMap，將其轉換爲MemoryStream，然後轉換爲字節數組。據說Jave服務器接收字節數組並將其寫入文件。圖像在那裏，但我失去了Exif信息。這是我的問題.. – Yoshi3003

我找到了自己問題的答案。對於那些可能對此有問題的人。我簡單地使用：

Byte[] imageData = new byte[e.ChosenPhoto.Length]; 
e.ChosenPhoto.Position = 0; 
e.ChosenPhoto.Read(imageData, 0, imageData.Length);

然後在我的發送功能發送的字節數組：

socketEventArg.SetBuffer(imageData, 0, imageData.Length);

來源

2012-10-16 23:21:44 Yoshi3003

發送圖像與從Windows Phone到Java服務器的Exif信息

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