Sending Image with Exif info from Windows Phone to Java Server - image

Question

I'm new in programming in Windows Phone (and StackOverflow tbh). Currently, I'm working on a task that concerns with sending images stored in the Windows Phone's storage (with Exif info) to a Java server. So far I have successfully send the byte stream from the Windows Phone client and construct the image on the Java side, however, the Exif information is somehow lost. I believe it's just the way I send it on Windows Phone that's causing the problem. Very much appreciated for any help or guidance !
Here's my code on the Windows Phone client:
// 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();
}
}
Here's the code in the 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;
}
On the Java Server,
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);
}
}
The output image is identical to the one sent from the windows phone, just without any Exif information whatsoever. Anyone could point out what I did wrong that causes the information to be lost? I'm guessing because I called the SaveJpeg function in the windows phone code, rewriting the image file, and losing all information there, but I don't know how else to convert the image to byte and stream it.
Much help is appreciated ! Thank you.

Answer 1

I found the answer to my own problem. For those of you who might have a problem with this. I simply use:
Byte[] imageData = new byte[e.ChosenPhoto.Length];
e.ChosenPhoto.Position = 0;
e.ChosenPhoto.Read(imageData, 0, imageData.Length);
Then send the byte array in my send function:
socketEventArg.SetBuffer(imageData, 0, imageData.Length);