//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;
}