两个宏函数能够获取类成员在类中的位移及大小,如果能够熟练使用这两个函数， 对于大量类属性需要通过界面设置修改的程序，将会使代码大为简化，并且也有利于代码维护及功能扩展-Two Macro function able to obtain offset of members of the class and size of members of the class , if the skilled use of these two functions, for a large number