WSAEnumNetworkEvents到底在什么情形下要被用到?

[ewrwqe]

Winsock接受数据的时候，使用普通的accept,bind,listen,recv,send不就可以了么?

什么时候需要去处理一个socket的事件? 如果在等待数据的过程中，连接断了，应该read函数出错退出啊，也没有什么所谓的事件发生。

socket事件不就是收发数据，连接断开什么的么?

谢谢

[Eleven]

WSAEventSelect模型
MSND上的例子

The following example demonstrates the use of the WSAEnumNetworkEvents function.


//-------------------------
// Declare and initialize variables
SOCKET SocketArray[WSA_MAXIMUM_WAIT_EVENTS], 
  ListenSocket;
WSAEVENT EventArray[WSA_MAXIMUM_WAIT_EVENTS];
WSANETWORKEVENTS NetworkEvents;
sockaddr_in InetAddr;
DWORD EventTotal = 0, Index, i;

//-------------------------
// Create a listening socket
ListenSocket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
InetAddr.sin_family = AF_INET;
InetAddr.sin_addr.s_addr = htonl(INADDR_ANY);
InetAddr.sin_port = htons(27015);

//-------------------------
// Bind the listening socket
bind (ListenSocket, (SOCKADDR *) &InetAddr, sizeof(InetAddr));

//-------------------------
// Create a new event
NewEvent = WSACreateEvent();

//-------------------------
// Associate event types FD_ACCEPT and FD_CLOSE
// with the listening socket and NewEvent
WSAEventSelect(ListenSocket, NewEvent, FD_ACCEPT|FD_CLOSE);

//-------------------------
// Start listening on the socket
listen(ListenSocket, 10);

//-------------------------
// Add the socket and event to the arrays, increment number of events
SocketArray[EventTotal] = ListenSocket;
EventArray[EventTotal] = NewEvent;
EventTotal++;

//-------------------------
// Wait for network events on all sockets
Index = WSAWaitForMultipleEvents(EventTotal, 
  EventArray, 
  FALSE, 
  WSA_INFINITE, 
  FALSE);
Index = Index - WSA_WAIT_EVENT_0;

//-------------------------
// Iterate through all events and enumerate
// if the wait does not fail.
for (i = Index; i < EventTotal; i++) {
  Index = WSAWaitForMultipleEvents(1, 
    &EventArray[i], 
    TRUE, 
    1000, 
    FALSE);
  if ((Index != WSA_WAIT_FAILED) && (Index != WSA_WAIT_TIMEOUT)) {
    WSAEnumNetworkEvents(SocketArray[i],
      EventArray[i],
      &NetworkEvents);
  }
}

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