如果是用WINSOCK的话,WINSOCK.STATUS来判断常数                 值 描述 sckClosed            0 缺省的。关闭 
sckOpen              1 打开 
sckListening         2 侦听 
sckConnectionPending 3 连接挂起 
sckResolvingHost     4 识别主机 
sckHostResolved      5 已识别主机 
sckConnecting        6 正在连接 
sckConnected         7 已连接 
sckClosing           8 同级人员正在关闭连接 
sckError             9 错误