有人知道如何在服务器端判断一个服务器端的TCP连接套接字被客户端关闭了吗？

Question

用什么函数来判断？好象用 DealSocket == INVALID_SOCKET 不行,套接字API中有函数可以判断吗？

Answer 1

我记得好像会发一个FD_CLOSE消息吧？

Answer 2

int WSAEventSelect(
  SOCKET s,               
  WSAEVENT hEventObject,  
  long lNetworkEvents     
);

Answer 3

我记得好像会发一个FD_CLOSE消息吧？
+
int WSAEventSelect(
  SOCKET s,               
  WSAEVENT hEventObject,  
  long lNetworkEvents     
);将事件怎加， FD_CLOSE | FD_READ

Answer 4

在服务端，处理FD_CLOSE消息，消息参数中wParam即是关闭的客户端SOCKET套接字

Answer 5

在TCP方式,用WSAEventSelect 来处理消息,要注意FD_CLOSE可能在没有接收结束就会接到
给你贴个例子:
UINT CReadSocket::ReaderProc( LPVOID pArgv )
{
DWORD dwResult = 0;
bool fDone = false;
HANDLE  hArray[2] = { NULL,NULL };
WSANETWORKEVENTS nwEvents;
int nErr = 0;
         BOOL    bClosed = FALSE; CReadSocket * pOwner = (CReadSocket*)pArgv;
    
         if( pOwner == NULL )
            return 0; Startup();
//
memset( &nwEvents, 0, sizeof( WSANETWORKEVENTS)); hArray[0] = pOwner->m_hQuit;
hArray[1] = pOwner->m_hSocketEvent;
//
for( ; !fDone ; )
{
    dwResult = WSAWaitForMultipleEvents( 2, hArray, FALSE, 500, FALSE );

switch( dwResult )
{
case WSA_WAIT_EVENT_0:// close event
fDone = !fDone;
break;
case WSA_WAIT_EVENT_0+1:
{
  nErr = WSAEnumNetworkEvents( pOwner->m_socket, hArray[1], &nwEvents );

if( nErr != 0 )
break;
//
                if( nwEvents.lNetworkEvents & FD_READ ){
pOwner->OnRead( nwEvents.iErrorCode[FD_READ_BIT] );
                } if( nwEvents.lNetworkEvents & FD_CLOSE )
{
                    bClosed = TRUE;
}
if( nwEvents.lNetworkEvents & FD_ADDRESS_LIST_CHANGE )
{
}
if( nwEvents.lNetworkEvents & FD_ROUTING_INTERFACE_CHANGE )
{
}
}
break;
case WSA_WAIT_TIMEOUT:
            if( bClosed ){
                nErr = pOwner->OnRead( 0 );
                if( nErr == 0 || nErr == SOCKET_ERROR ){
                    fDone = true;
                    pOwner->OnClose( 0 );
                }
            } break;
default:
fDone = true;
break;
}
}
pOwner->OnClose( nwEvents.iErrorCode[ FD_CLOSE_BIT] );
Cleanup();
    TRACE( "CReadSocket Thread Exit.\n");
return 1;
}