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CDragListBox
In addition to proving the functionality of a windows list box, the CDragListBox class allows
the user to move list box items.

修改socket属性
int TimeOut=6000; //设置发送超时6秒
if(::setsockopt(sock,SOL_SOCKET,SO_SNDTIMEO,(char *)&TimeOut,sizeof(TimeOut))==SOCKET_ERROR)
{
::closesocket (sock);
continue;
}

TimeOut=6000;//设置接收超时6秒
if(::setsockopt(sock,SOL_SOCKET,SO_RCVTIMEO,(char *)&TimeOut,sizeof(TimeOut))==SOCKET_ERROR)
{
::closesocket (sock);
continue;
}

//设置非阻塞方式连接
unsigned long ul = 1;
ret = ioctlsocket(sock, FIONBIO, (unsigned long*)&ul);
if(ret==SOCKET_ERROR)
{
::closesocket (sock);
continue;
}