#include<stdio.h>
#include<dos.h>

int OpenComm(LPCSTR lpszDevControl, UINT cbInQueue,UINT cbOutQueue);

void main()
{
  int idComDev,err;

  idComDev = OpenComm("COM1", 1024, 128);
  if (idComDev < 0)
  {
      printf("OpenComm err\n");
      return ;
  }

  err = BuildCommDCB("COM1:9600,n,8,1", &dcb);
  if (err < 0)
  {
    printf("BuildCommDCB err\n");
    return ;
  }

    err = SetCommState(&dcb);
   if (err < 0)
      {
      printf("SetCommState err");
      return ;
      }

}