串口发送缓冲区头指针,存入；串口发送缓冲区尾指针,取出；串口发送缓冲区

如果之前未接触过，很难把握对于返回值为指针的函数如何调用，本例以主函数调用一个返回值为指针的函数为例，很好的演示了这一问题-If you have not previously exposed to, it is difficult to grasp how to call the function return value is a pointer to this case, the main function calls a function return value is a pointe

C++里面的各种类，对象，变量，函数，指针，等的使用方法-C++ inside the various classes, objects, variables, functions, pointer, such as the use of