Losing data with Socket.SendFile

[Matt]

Hi all,

Probably a silly mistake, but I seem to be losing 24 bytes every time I
attempt to send a file using Socket.SendFile().

Here is my code:

Here is the server method:

void receiveCallback(IAsyncResult ar)
{
StateObject state = (StateObject)ar.AsyncState;
Socket handler = state.workSocket;

MemoryStream ms = new MemoryStream();
FileStream fs = null;
try
{
int totalBytes = 0;
int numBytes = 0;
do
{
totalBytes += numBytes =
handler.Receive(state.buffer);
ms.Write(state.buffer, 0, numBytes);
System.Threading.Thread.Sleep(500);
} while (numBytes 0);

fs = new FileStream(@"C:\abc.doc", FileMode.Create);
ms.WriteTo(fs);
}
catch (Exception e)
{
EventLog.WriteEntry("File Transfer failed: \n" +
e.Message, System.Diagnostics.EventLogEntryType.Error);
Debug.WriteLine(e);
}
finally
{
if (fs != null)
{
fs.Flush();
fs.Close();
}
ms.Close();
handler.EndReceive(ar);
}
}
and the test client uses simply:

static void SendFile(string file)
{
//socket.Send(new byte[1]); //UNCOMMENT THIS LINE
socket.SendFile(file);
socket.Shutdown(SocketShutdown.Both);
socket.Close();
}

If I send something down the pipe - even just one byte - before sending
the file, the file will transfer successfully. I guess I'm not
initialising the socket correctly at one end or the other.

Does anyone have any idea on this?

Cheers,

Matt Jacobsen