1 #include  <windows.h>
 2 #include   <stdio.h>
 3 #include   <stdlib.h>
 4 
 5 bool openport(char *portname)//打开串口
 6 {
 7     HANDLE hComm;
 8     hComm = CreateFile(portname, //串口号
 9         GENERIC_READ | GENERIC_WRITE, //允许读写
10         0, //通讯设备必须以独占方式打开
11         0, //无安全属性
12         OPEN_EXISTING, //通讯设备已存在
13         FILE_FLAG_OVERLAPPED, //异步I/O
14         0); //通讯设备不能用模板打开
15     if (hComm == INVALID_HANDLE_VALUE)
16     {
17         CloseHandle(hComm);
18         return FALSE;
19     }
20     else
21         return true;
22 }
23 
24 void main()
25 {
26     bool open;
27     open=openport("com4");
28     if(open)
29         printf("open comport success");
30     system("pause") ;
31 }