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I have a function which sends a text string to a socket.

Posted on 2000-02-22
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Last Modified: 2010-04-02
I have a function which sends a text string to a socket.
I only want the function to return when I recieve a reply from the socket.

Any ideas how i do this?


further details

function x
{
  m_socket->Send("some text");

 return socket's (m_socket->Reply())
}
0
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Question by:yakky
2 Comments
 
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Accepted Solution

by:
JMu earned 400 total points
ID: 2547074
The correct answer depends on the protocol you use.

int SendStringAndReceiveReply( const char* string, char* replyBuffer, int replyBufferLength )
{
  int bytes = strlen( string );
  int bytesWritten = m_socket->Send( string, bytes, 0 );

  if ( bytesWritten != bytes )
    return -1;

  // then read a reply - I assume you use blocking socket

  int bytesReceived = m_socket->Recv( replyBuffer, replyBufferLength, 0 );

  return bytesReceived;
}

This is a problem if server never send a reply. For that you could use wait timeout and ioctlsocket( FIONREAD ... ) in a loop.

I would use async socket and wait FD_READ. See WSAAsyncSelect and WSAEventSelect. These are Win32-functions. If you don't use Windows, you may use select()-funtion, I think.

JMu
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Author Comment

by:yakky
ID: 2549741
Thanks very much its done the trick
Yakky
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