WSARecv函数有接受数据，但是返回的数据长度是0

jiangfeng999 2009-07-03 09:27:15

我用异步的模式接收http请求，在send完一个http请求之后，用WSARecv接收服务器的响应.奇怪的是有时候WSARecv函数返回后m_pHttpContent有内容，但是dwRecvBytes的返回值却是0.不知道为什么



memset(sHttpReqest,0,sizeof(sHttpReqest));

sprintf(sHttpReqest,"GET %s HTTP/1.1\r\nAccept:*/*\r\nAccept-Language:zh-cn\r\n",pHttpUrl,HTTP_VERSION);

sprintf(sHttpReqest,"%sUser-Agent:Mozilla/4.0 (compatible;MSIE 7.0;Windows XP; .NET CLR 1.1.4322; .NET CLR 2.0.50727)\r\n",sHttpReqest);

sprintf(sHttpReqest,"%sHost:%s\r\n",sHttpReqest,sHostName);

sprintf(sHttpReqest,"%sConnection: Keep-Alive\r\n\r\n",sHttpReqest);

nRet = send(m_hSocket,sHttpReqest,strlen(sHttpReqest),0);

fprintf(stderr,"成功发送到%s的请求\n",pHttpUrl);

if(nRet==SOCKET_ERROR)

{

	//异常处理

}



DWORD dwRecvBytes=0;

DWORD Flags=0;



m_WsaBufHttpRecv.buf = m_pHttpContent+m_dwTotalBytesRecv;

m_WsaBufHttpRecv.len = 8192;

nRet = WSARecv(m_hSocket,&m_WsaBufHttpRecv,1,&dwRecvBytes,&Flags,&m_Overlapped,NULL);

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fly1140 2009-07-03

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判断 nRet 值, 如果是 SOCKET_ERROR 并且 WSAGetLastError 返回 WSA_IO_PENDING, 代表重叠还在进行, Overlapped operations will complete later. 在这种情况下, dwRecvBytes是不会被更新的, 还是0.
所以你需要检查一下