SetSockOpt with SO_REUSEADDR parameter

From:

=?Utf-8?B?bW1sYWJfanM=?= <mmlabjs@discussions.microsoft.com>

Newsgroups:

microsoft.public.vc.mfc

Date:

Wed, 21 Mar 2007 19:44:03 -0700

Message-ID:

<624E5BA0-54B6-4216-BBF3-1030F500A0E5@microsoft.com>

Hi,
I write a server application to send message to multiple clients connected
to it. So I create multiple UDP sockets with the same port to send data. At
first, I get the error code " 10048 " and find a solution from MSDN. It tells
me to use SetSockOpt with SO_REUSEADDR. I rewrite the function that creates a
UDP socket:
=======================================
// CUdpSendSocket is derived from CAsyncSocket
void CUdpSendSocket::CreateSocket(UINT nPort)
{
   TCHAR szError[256];

   BOOL bRet = Create(nPort, SOCK_DGRAM, FD_WRITE);

   if (bRet != TRUE) {
      wsprintf(szError, "Send Socket Create() failed: %d", GetLastError());
      AfxMessageBox(szError);
      return;
   }
   m_nPortNum = nPort;

   int flag = -1;
    if (!SetSockOpt(SO_REUSEADDR ,&flag, sizeof(int))) {
        wsprintf(szError, "SetSockOpt failed to set SO_REUSEADDR:% d",
GetLastError());
      AfxMessageBox (szError);
    }
}
=======================================
When a client is connecting to server, server will accept the connection and
create a thread that creates a CUdpSendSocket socket to send data.
When the second client is connecting to server, I still get the error code
"10048".
Does I use SetSockOpt with wrong way?
What shall I do?

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