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Sending a .Net Bitmap to a native C++ server

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I'm trying to send an image from a PDA to a server. PDA part is coded in .Net, the image being a Bitmap class. I tried the following but I doubt on the C++ side, I can "understand" what this Bitmap class' data is... I just want the image to get to the server in a format I can understand.
// PDA side
MemoryStream ms = new MemoryStream();
image.Save(ms, ImageFormat.Bmp);
byte[] imageBuffer = ms.ToArray();
networkStream.Write(imageBuffer, 0, (int)imageBuffer.Length);

// Server side
while (total < length && (bytesReceived = recv(socketClient, &buffer[total], length - total, 0)) != 0)
    total += bytesReceived;
    HBITMAP tmp = (HBITMAP)buffer;       // doesn't seem to work
Any ideas? Thanks

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