C语言读取串口数据并16进制打印

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// port.cpp : 定义控制台应用程序的入口点。

//

#include "stdafx.h"

#include <Windows.h>

#include <stdio.h>

HANDLE hCom;

int main(void)

{

    hCom = CreateFile(TEXT("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);

    if (hCom == (HANDLE)-1)

    {

        printf("打开COM失败!\n");

        return FALSE;

    }

    else

    {

        printf("COM打开成功！\n");

    }

    SetupComm(hCom, 1024, 1024); //输入缓冲区和输出缓冲区的大小都是1024

    COMMTIMEOUTS TimeOuts;

    //设定读超时

    TimeOuts.ReadIntervalTimeout = 1000;

    TimeOuts.ReadTotalTimeoutMultiplier = 5000;

    TimeOuts.ReadTotalTimeoutConstant = 5000;

    //设定写超时

    TimeOuts.WriteTotalTimeoutMultiplier = 5000;

    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; //1个停止位

    SetCommState(hCom, &dcb);

    DWORD wCount=12;//读取的字节数

    BOOL bReadStat;

    while (1)

    {

        PurgeComm(hCom, PURGE_TXCLEAR | PURGE_RXCLEAR); //清空缓冲区

        unsigned char str[13] = { 0 };

        printf("%s\n", str);

        bReadStat = ReadFile(hCom, str,13, &wCount, NULL);

        if (!bReadStat)

        {

            printf("读串口失败!");

            return FALSE;

        }

        else

        {

            str[12] = '*';

            for (int i = 0; str[i] != '*'; i++){

                printf("%02X ", str[i]);

                //printf("%u",str[i]);

            }

        }

        //unsigned char a='0';

        //unsigned char b = '0x01';

        if (str[6]==0){

            printf(" 无车");

        }

        else if(str[6]==1){

            printf(" 有车");

        }

        else

            printf(" 有错");

        printf("\n");

        Sleep(100);

    }

}