Win32 API UART编程

下面是一个使用Win32 API进行UART编程的简单示例。

 1 #include <windows.h>
 2 #include <stdio.h>
 3
 4 int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nShowCmd)
 5 {
 6     HANDLE hCom;
 7     DWORD dwError;
 8     BYTE buf;
 9     DWORD nBytes;
10
11     printf("%s\n", lpCmdLine);
12
13     hCom = CreateFile("COM1", GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_EXISTING, 0, NULL);
14
15     if (hCom == (HANDLE)-1) {
16         dwError = GetLastError();
17         printf("Error = %d\n", dwError);
18         return 0;
19     }
20
21     DCB dcb;
22     GetCommState(hCom, &dcb);
23     dcb.BaudRate = 9600;
24     dcb.ByteSize = 8;
25     dcb.Parity = NOPARITY;
26     dcb.StopBits = 1;
27     dcb.fBinary = TRUE;
28     dcb.fParity = TRUE;
29     SetCommState(hCom, &dcb);
30     SetupComm(hCom, 1024, 1024);
31     PurgeComm(hCom, PURGE_TXABORT | PURGE_RXABORT | PURGE_TXCLEAR | PURGE_RXCLEAR);
32
33     COMMTIMEOUTS to;
34     memset(&to, 0, sizeof(to));
35     to.ReadIntervalTimeout = 10;
36     SetCommTimeouts(hCom, &to);
37
38     WriteFile(hCom, &buf, sizeof(buf), &nBytes, NULL);
39     ReadFile(hCom, &buf, sizeof(buf), &nBytes, NULL);
40
41     CloseHandle(hCom);
42     return 0;
43 }