基于windows的C/C++串口编程

基于windows的C/C++串口编程

下面代码是接收到的数据在发回去的代码。COM2为端口名称，根据实际进行更改！

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

#define debug(...) printf(__VA_ARGS__)

int main(void)
{
  DCB dcb;
  HANDLE hCom;
  COMMTIMEOUTS CommTimeouts;
  DWORD wRead, wWrite;
  WINBOOL bReadStat;
  char hj212_string[1500];

  hCom = CreateFile(TEXT("COM2"), GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);

  if(hCom == INVALID_HANDLE_VALUE)
  {
    debug("Can not open COM2 !\r\n");
    return -1;
  }else
  {
    debug("Open COM2 Successfully !\r\n");
  }

  // 设置读写缓存大小
  SetupComm(hCom, 2048, 2048);

  //设定读超时
  CommTimeouts.ReadIntervalTimeout = MAXDWORD;//读间隔超时
  CommTimeouts.ReadTotalTimeoutMultiplier = 0;//读时间系数
  CommTimeouts.ReadTotalTimeoutConstant = 0;//读时间常量

  //设定写超时
  CommTimeouts.WriteTotalTimeoutMultiplier = 1;//写时间系数
  CommTimeouts.WriteTotalTimeoutConstant = 1;//写时间常量
  SetCommTimeouts(hCom, &CommTimeouts); //设置超时


  GetCommState(hCom, &dcb);
  dcb.BaudRate = 9600; //波特率为9600
  dcb.ByteSize = 8; //每个字节有8位
  dcb.Parity = NOPARITY; //无奇偶校验位
  dcb.StopBits = ONESTOPBIT; //一个停止位
  SetCommState(hCom, &dcb);

  while(1)
  {
    wRead = 0;
    bReadStat = ReadFile(hCom, hj212_string, sizeof(hj212_string), &wRead, NULL);
    if(bReadStat && wRead != 0)
    {
      WriteFile(hCom, hj212_string, wRead, &wWrite, NULL);
    }
  }

  CloseHandle(hCom);
}