WSARecvFrom阻塞

Question

出于某种原因，当我调用WSARecvFrom时，函数在收到函数之前不会返回。

_socket = WSASocket(AF_INET, SOCK_DGRAM, IPPROTO_UDP, NULL, NULL, WS_OVERLAPPED);
...
sockaddr_in addr = ...
if(bind(_socket, (const sockaddr*)&addr, sizeof(addr)) != EXIT_SUCCESS) { ... }
...
HANDLE _handle = CreateIoCompletionPort((HANDLE)_socket, _ioHandle, NULL, NULL);
...
_recvOverlap->OVERLAP.hEvent = WSACreateEvent();
DWORD sz = 0, flag = 0;
return WSARecvFrom(_socket, _recvBuf, 1, &sz, &flag, (sockaddr*)_recvAddr, &_recvAddrSz, (LPWSAOVERLAPPED)_recvOverlap, NULL);

Answer 1

将WS_OVERLAPPED（值为0）更改为WSA_FLAG_OVERLAPPED（其值为1）。您没有正确创建重叠的套接字，因此_recvOverlap忽略了WSARecvFrom()。