Win32 API UART编程

下面是一个使用Win32 API进行UART编程的简单示例。

 #include <windows.h>
 #include <stdio.h>

 int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nShowCmd)
 {
     HANDLE hCom;
     DWORD dwError;
     char buf[] = "Hello World From COM3!\n";
     DWORD nBytes;

     printf("%s\n", lpCmdLine);

     hCom = CreateFile("COM3", GENERIC_READ | GENERIC_WRITE, , NULL, OPEN_EXISTING, , NULL);

     if (hCom == (HANDLE)-) {
         dwError = GetLastError();
         printf("Error = %d\n", dwError);
         return ;
     }

     DCB dcb;
     GetCommState(hCom, &dcb);
     dcb.BaudRate = ;
     dcb.ByteSize = ;
     dcb.Parity = NOPARITY;
     dcb.StopBits = ;
     dcb.fBinary = TRUE;
     dcb.fParity = TRUE;
     SetCommState(hCom, &dcb);
     SetupComm(hCom, , );
     PurgeComm(hCom, PURGE_TXABORT | PURGE_RXABORT | PURGE_TXCLEAR | PURGE_RXCLEAR);

     COMMTIMEOUTS to;
     memset(&to, , sizeof(to));
     to.ReadIntervalTimeout = ;
     SetCommTimeouts(hCom, &to);

     WriteFile(hCom, buf, sizeof(buf), &nBytes, NULL);
     printf("Data Sent! NBytes = %d\n", nBytes);
     ReadFile(hCom, buf, sizeof(buf), &nBytes, NULL);
     printf("Data Received! NBytes = %d\n", nBytes);

     printf("%s\n", buf);

     CloseHandle(hCom);
     return ;
 }