通过介绍SetTimer函数，来计算通信延时。在VC下得到精确延时时间，而sleep函数是完成不了的-By introducing the SetTimer function to calculate the communication time delay. In the next VC to be accurate delay time, and can not sleep function is to complete

SetTimer 的设置,这里可以学习到一些有用的设置-SetTimer