Recv函数执行时间过长，请问大家如何解决？

SevenCat

非堵塞　被你去掉了。

nocture

switch( WSAGETSELECTEVENT(lParam) )
{
  case FD_READ:
  {
     WSAAsyncSelect(_socket, _hwnd, NETCLIENT_EVENT_MSG, 0);
     int iMode = 0;
     ioctlsocket(_socket, FIONBIO, (u_long FAR*) &iMode);
     recv();
     .....
     WSAAsyncSelect(_socket, _hwnd, NETCLIENT_EVENT_MSG,
               FD_CONNECT | FD_CLOSE | FD_READ);
  }
}

tarkey

用非阻塞的话，注意处理一下消息结构。
阻塞模式的话，你只能开线程去收。

bigbook2000

跟这个没有关系，有些时候就是很长

FIONBIO
Enable or disable nonblocking mode on socket s. lpvInBuffer points at an unsigned long (QOS), which is nonzero if nonblocking mode is to be enabled and zero if it is to be disabled. When a socket is created, it operates in blocking mode (that is, nonblocking mode is disabled). This is consistent with BSD sockets.
The WSAAsyncSelect or WSAEventSelect routine automatically sets a socket to nonblocking mode. If WSAAsyncSelect or WSAEventSelect has been issued on a socket, then any attempt to use WSAIoctl to set the socket back to blocking mode will fail with WSAEINVAL. To set the socket back to blocking mode, an application must first disable WSAAsyncSelect by calling WSAAsyncSelect with the lEvent parameter equal to zero, or disable WSAEventSelect by calling WSAEventSelect with the lNetworkEvents parameter equal to zero.

nocture

注释掉以下两句也没有用啊
int iMode = 0;
ioctlsocket(_socket, FIONBIO, (u_long FAR*) &iMode);

tarkey

跟阻塞和非阻塞是有关系的。
非阻塞的模式不会等，会直接返回，不过一次不一定收完。

bigbook2000

不信的话你们自己写一段然后分析一下recv这个函数，时间消耗有的时候就是很长

不过
if (!socket_recv(&datalen, 1, wParam, lParam))//测试消耗140多毫秒


我不清楚你在socket_recv这个函数里干些什么

bigbook2000

The WSAAsyncSelect or WSAEventSelect routine automatically sets a socket to nonblocking mode

bigbook2000

没什么阻塞非阻塞的，用了WSAAsyncSelect or WSAEventSelect 就是非阻塞的

SevenCat

唉，要详细说的话要说一大堆，
你先用setsockopt设置SO_RCVTIMEO这个选项试试吧。（上面的两行不用注释掉）