VS2013MFC基于TCP/IP通讯的心跳功能的实现
古城孤客 2019-05-29 09:36:22 我用VS2013MFC写了一个基于TCP/IP的服务器和客户端程序,用一台电脑控制多台电脑打开PPT,在多个投影仪上演示PPT,很完美!但是有一个遗憾,就是没有实现心跳功能,我想利用WSAIoctl来实现心跳,程序如下:编译,运行均正常。但是无论是把这段程序单独放在服务器,单独放在客户端,还是客户端服务器都放,我故意退出服务器或客户端,等了10多分钟,也没有发生心跳。请指教!
//心跳包的实现----开启KeepAlive
/* BOOL bKeepAlive = TRUE;
int nRet = ::setsockopt(sockClient, SOL_SOCKET, SO_KEEPALIVE, (char*)&bKeepAlive, sizeof(bKeepAlive));
if (nRet != 0)
{
AfxMessageBox(_T("出错"));
return 0;
}
*/ //改变socket的keep alive心跳包为10s,并发送3次-----设置KeepAlive参数
tcp_keepalive inKeepAlive = { 0 }; //输入参数
tcp_keepalive outKeepAlive = { 0 }; //输出参数
unsigned long ulBytesReturn = 0;
inKeepAlive.onoff = true;
inKeepAlive.keepaliveinterval = 400; //两次KeepAlive探测间的时间间隔
inKeepAlive.keepalivetime = 100; //开始首次KeepAlive探测前的TCP空闲时间
int nRet = WSAIoctl(sockClient, SIO_KEEPALIVE_VALS, &inKeepAlive, sizeof(inKeepAlive),
&outKeepAlive, sizeof(outKeepAlive), &ulBytesReturn, NULL, NULL);
if (SOCKET_ERROR == nRet)
{
AfxMessageBox(_T("出错"));
return false;
}