VC++串口

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HANDLE hCom; //串口句柄
DWORD dwFlags; // 需要完成的操作

hCom=CreateFile("COM1",//COM1口
GENERIC_READ|GENERIC_WRITE, //允许读和写
0, //独占方式
NULL,
OPEN_EXISTING, //打开而不是创建
0, //同步方式
NULL);
SetupComm(hCom,100,100); //输入缓冲区和输出缓冲区的大小都是1024
if(hCom==(HANDLE)-1)
{
printf("hCom!\n");

}
COMMTIMEOUTS TimeOuts;
//设定读超时
TimeOuts.ReadIntervalTimeout=1000;
TimeOuts.ReadTotalTimeoutMultiplier=500;
TimeOuts.ReadTotalTimeoutConstant=5000;
//设定写超时
TimeOuts.WriteTotalTimeoutMultiplier=500;
TimeOuts.WriteTotalTimeoutConstant=2000;
SetCommTimeouts(hCom,&TimeOuts); //设置超时

DCB dcb;
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=ONE5STOPBITS; //两个停止位
SetCommState(hCom,&dcb);
PurgeComm(hCom,PURGE_TXCLEAR|PURGE_RXCLEAR);

char lpOutBuffer[100];
lpOutBuffer[0]=0x03;
lpOutBuffer[1]=0x21;
lpOutBuffer[2]=0x00;

DWORD dwBytesWrite=100;
COMSTAT ComStat;
DWORD dwErrorFlags;
BOOL bWriteStat;
ClearCommError(hCom,&dwErrorFlags,&ComStat);
bWriteStat=WriteFile(hCom,lpOutBuffer,strlen(lpOutBuffer),& dwBytesWrite,NULL);
if(!bWriteStat)
{
printf("ERRO!\n");
}
PurgeComm(hCom, PURGE_TXABORT|PURGE_RXABORT|PURGE_TXCLEAR|PURGE_RXCLEAR);

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