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C6748基于stareware的lwip1.3.2的udp通信,网口拔插,程序中哪里会有检测网络是否连接

C6748基于stareware的lwip1.3.2的udp通信,网口拔插,程序中哪里会有检测网络是否连接。应该在连接成功会有标志位,断开连接也有一个标志位吧。