说明：  Serial communications is needed in several types of applications, but the Win32 API isn t a very easy to use API to implement it. Things get even more complicated when you want to use serial communication in an MFC based program. The classes provided in the library try to make life a little easier. Its documentation is extensive, because I want to give you a good background. Serial communication is hard and good knowledge of its implementation saves you a lot of work, both now and in the future...