最近接了一个任务，要求接收一个指令然后就打印一个标签。 刚接触COM通信，写了一个小的测试程序配合虚拟串口使用。比较简单，基础级的 -Recently received a task, ask to receive a command and then print a label. New to COM communication, wrote a small test program with a virtual serial port to use. Relatively simp