As we know,we must use a lot of Windows APIs in the program. Furthermore, Win32 serial communication program is different from that of Win16, so making Win32 serial communication program is difficult.

• 由于编写 Windows串行通信程序要用到大量的Windows API函数，再加上 Win32位串行通信与 Win16串行通信有很大区别，所以，编写串行通讯程序的难度就比较大。