在网络协议、通信控制、嵌入式系统的C/C++编程中，我们经常要传送的不是简单的字节流（char

型数组），而是多种数据组合起来的一个整体，其表现形式是一个结构体。

经验不足的开发人员往往将所有需要传送的内容依顺序保存在char 型数组中，通过指针偏移的

方法传送网络报文等信息。这样做编程复杂，易出错，而且一旦控制方式及通信协议有所变化，程序

就要进行非常细致的修改。-In the network protocol, communication control, embedded system' s C/C++ programming, we often want to send is not a simple byte Liu (char array), but Duozhong data sets up to a whole, its manifestation is a structure. Inexperienced developers often need to transfer all the content in accordance with the order saved in char array, the pointer offset by means of transmission network packets and other information. This programming complex, error-prone, and once the control method and communication protocol change, the program will be carried out very detailed changes.