一个简单实现Ethernet数据帧封装和计算 CRC 校验的功能的程序，供新手参考-achieve a simple Ethernet data frames Packaging, and CRC calculation of the function of the procedures for newcomers reference

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Microsoft Visual Studio 2010编的tcpip程序.发送结构体，带CRC校验-tcpip programming,sending struct with CRC check