socket长连接的keeplive

//设置KeepAlive BOOL bKeepAlive = TRUE; nRet = ::setsockopt(m_sockDesc, SOL_SOCKET, SO_KEEPALIVE, (char*)&bKeepAlive, sizeof(bKeepAlive)); if (nRet !=0) { sprintf(m_pszError, "Winsock error : %s (Error Code %d)\n ", "Socket SetOpt failed ", WSAGetLastError()); return FALSE; } //设置KeepAlive检测时间和次数 TCP_KEEPALIVE inKeepAlive = {0}; //输入参数 unsigned long ulInLen = sizeof(TCP_KEEPALIVE); TCP_KEEPALIVE outKeepAlive = {0}; //输出参数 unsigned long ulOutLen = sizeof(TCP_KEEPALIVE); unsigned long ulBytesReturn = 0; //设置socket的keep alive为10秒，并且发送次数为3次 inKeepAlive.onoff = 1; inKeepAlive.keepaliveinterval = 10000; //两次KeepAlive探测间的时间间隔 inKeepAlive.keepalivetime = 3; //开始首次KeepAlive探测前的TCP空闭时间 nRet = WSAIoctl(m_sockDesc, SIO_KEEPALIVE_VALS, (LPVOID)&inKeepAlive, ulInLen, (LPVOID)&outKeepAlive, ulOutLen, &ulBytesReturn, NULL, NULL); if(SOCKET_ERROR == nRet) { sprintf(m_pszError, "Winsock error : %s (Error Code %d)\n ", "Nonblocking socket call error ", WSAGetLastError()); return FALSE; } ------------------------------------------------------------------------------------------------------------------------------- //设置KeepAlive BOOL bKeepAlive = TRUE; nRet = ::setsockopt(m_sockDesc, SOL_SOCKET, SO_KEEPALIVE, (char*)&bKeepAlive, sizeof(bKeepAlive)); if (nRet !=0) { sprintf(m_pszError, "Winsock error : %s (Error Code %d)\n ", "Socket SetOpt failed ", WSAGetLastError()); return FALSE; } //设置KeepAlive检测时间和次数 TCP_KEEPALIVE inKeepAlive = {0}; //输入参数 unsigned long ulInLen = sizeof(TCP_KEEPALIVE); TCP_KEEPALIVE outKeepAlive = {0}; //输出参数 unsigned long ulOutLen = sizeof(TCP_KEEPALIVE); unsigned long ulBytesReturn = 0; //设置socket的keep alive为10秒，并且发送次数为3次 inKeepAlive.onoff = 1; inKeepAlive.keepaliveinterval = 10000; //两次KeepAlive探测间的时间间隔 inKeepAlive.keepalivetime = 3; //开始首次KeepAlive探测前的TCP空闭时间 nRet = WSAIoctl(m_sockDesc, SIO_KEEPALIVE_VALS, (LPVOID)&inKeepAlive, ulInLen, (LPVOID)&outKeepAlive, ulOutLen, &ulBytesReturn, NULL, NULL); if(SOCKET_ERROR == nRet) { sprintf(m_pszError, "Winsock error : %s (Error Code %d)\n ", "Nonblocking socket call error ", WSAGetLastError()); return FALSE; }