物联网 Win平台 串口读写程序

该程序实现了串口的读写功能

适用于windows平台

开发环境为:VS2019

 

运行效果 目前很简陋，以后有时间再做细化:

 

该次运行是通过虚拟串口软件虚拟出com3,com4端口

com3连接程序，com4连接的是一款串口软件AccessPort 配置与图片在本文后面

 

com4端的配置

 

 

 

 

代码如下

#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <Windows.h>
#include <atlstr.h>
#include <strsafe.h>
#include <crtdbg.h>

int FILESIZE = 16;
char szStr[5] = "com3";


DWORD WriteFileContent(LPCWSTR szFilePath,DCB dcb)
{
    HANDLE hFile;
    
    BYTE lpFileDataBuffer[1024];
    //lpFileDataBuffer[0] = 0xff;
    //lpFileDataBuffer[1] = 0xff;
    DWORD dwWritedSize = 0;
    DWORD dwWritedSizes;
    int i = 0;
    int ByteSize = 0;

    hFile = CreateFile(szFilePath,
        GENERIC_WRITE,
        FILE_SHARE_READ,
        NULL,
        OPEN_ALWAYS,
        FILE_ATTRIBUTE_NORMAL,
        NULL
    );
    if (hFile == INVALID_HANDLE_VALUE)
    {
        printf("打开%s失败!\n",szStr);
        return 0;
    }

    /*
        DCB配置
    */
    if (!SetCommState(hFile, &dcb))
    {
        printf("BCD配置设置失败!");
        CloseHandle(hFile);
        getchar();
        system("pause");
        return 0;
    }

    while (1)
    {
        printf("请输入数据字节数，0则退出写入:\n>> ");
        scanf("%d", &ByteSize);

        if (ByteSize == 0)
        {
            break;
        }
            
        printf("请输入数据，其间空格隔开:\n>> ");
        for (i = 0; i < ByteSize; i++)
        {
            scanf("%x", &lpFileDataBuffer[dwWritedSize++]);
        }

        dwWritedSize = ByteSize;

        if (!WriteFile(hFile,
            lpFileDataBuffer,
            dwWritedSize,
            &dwWritedSizes,
            NULL))
        {
            printf("写入文件错误: %d\n", GetLastError());
            break;
        }
        printf("写入%d字节\n>> ", dwWritedSize);


        for (i = 0; i < dwWritedSize; i++)
        {
            printf("%x ", lpFileDataBuffer[i]);
        }
        printf("\n");
        dwWritedSize = 0;

        Sleep(1000);
    }
    CloseHandle(hFile);
    return 0;
}

DWORD ReadFileContent(LPCWSTR szFilePath, DCB dcb)
{
    HANDLE hFile;

    BYTE lpFileDataBuffer[1024];
    DWORD dwReadedSize;
    DWORD i;
    DWORD Time = 0;

    

    hFile = CreateFile(szFilePath,
        GENERIC_READ,
        FILE_SHARE_WRITE,
        NULL,
        OPEN_EXISTING,
        FILE_ATTRIBUTE_NORMAL,
        NULL);
    
    if (hFile == INVALID_HANDLE_VALUE)
    {
        printf("打开%s失败!\n",szStr);
        return 0;
    }

    /*
        DCB配置
    */
    if (!SetCommState(hFile, &dcb))
    {
        printf("BCD配置设置失败!");
        CloseHandle(hFile);
        return 0;
    }

    /*
        设置超时
    */
    COMMTIMEOUTS timeOver;
    memset(&timeOver, 0, sizeof(timeOver));
    DWORD timeMultiplier = 100, timeConstant = 5000;
    timeOver.ReadTotalTimeoutMultiplier = timeMultiplier;
    timeOver.ReadTotalTimeoutConstant = timeConstant;
    SetCommTimeouts(hFile, &timeOver);
    

    while (1)
    {
        if (!ReadFile(hFile,
            lpFileDataBuffer,
            FILESIZE,
            & dwReadedSize,
            NULL))
        {
            printf("读取文件错误: %d\n", GetLastError());
            break;
        }
        printf("读取%d字节\n>> ",dwReadedSize);
        if (dwReadedSize == 0)
        {
            ++Time;
            if (Time == 1)
            {
                printf("读取数据停止!\n");
                break;
            }
        }
        else
        {
            printf("读取%d字节\n>> ", dwReadedSize);
        }
        
        for (i = 0; i < dwReadedSize; i++)
        {
            printf(" %x ", lpFileDataBuffer[i]);
        }
        printf("\n");

        Sleep(1000);
    }
    CloseHandle(hFile);
    return 0;
}

void SetDcb(DCB* dcb)
{
    /*
        DCB结构配置
        BauRate        (波特率)
        fParity        (指定奇偶校验位)
        Parity        (校验方式)
        ByteSize    (数据位个数)
        StopBits    (停止位个数)
    */
    int No = 0;

    dcb->DCBlength = sizeof(DCB);

    while (1)
    {
        printf("  DCB结构配置\n");
        printf("0.设置:串口编号\n");
        printf("1.设置:波特率\n");
        printf("2.设置:检验方式\n");
        printf("3.设置:停止位数\n");
        printf("4.设置:数据位个数\n");
        printf("5.设置:读取时一组的字节数\n");
        printf("6.查看:当前结构\n");
        printf("7.退出\n");
        printf(">> ");

        scanf("%d",& No);
        switch (No) 
        {
            case 0:
            {
                printf("请输入串口编号 例如1:\n>> ");
                getchar();
                scanf("%c", &szStr[3]);
                printf("串口编号成功改为:%s\n", szStr);
                break;
            }
            case 1:
            {
                printf("波特率:\n>> ");
                scanf("%d", &dcb->BaudRate);
                printf("波特率成功改为:%d\n", dcb->BaudRate);
                break;
            }
            case 2:
            {
                printf("2 :偶校验    EVENPARITY\n");    //    EVENPARITY
                printf("3 :标志校验    MARKPARITY\n");    //    MARKPARITY    
                printf("0 :无校验    NOPARITY\n");    //    NOPARITY
                printf("1 :奇校验    ODDPARITY\n");    //    ODDPARITY
                printf(">> ");
                scanf("%d", &dcb->Parity);
                printf("校验法成功更改为:%d\n", dcb->Parity);
                break;
            }
            case 3:
            {
                printf("0 :1停止位        ONESTOPBIT\n");    //    ONESTOPBIT
                printf("1 :1.5停止位    ONE5STOPBITS\n");    //    ONE5STOPBITS
                printf("2 :2停止位        TWOSTOPBITS\n");    //    TWOSTOPBITS   
                printf(">> ");
                scanf("%d", &dcb->StopBits);
                printf("停止位成功更改为:%d\n", dcb->StopBits);
                break;
            }
            case 4:
            {
                printf("数据位个数:\n>> ");
                scanf("%d", &dcb->ByteSize);
                printf("数据位个数成功更改为:%d\n", dcb->ByteSize);
                break;
            }
            case 5:
            {
                printf("接收时每组字节数设置:\n>> ");
                scanf("%d", &FILESIZE);
                printf("接收时每组字节数成功更改为:%d", FILESIZE);
                break;
            }
            case 6:
            {
                printf("  DCB结构配置\n");
                printf("0.串口编号        %s\n",szStr);
                printf("1.波特率        %d\n", dcb->BaudRate);
                printf("2.检验方式        ");//%d\n", dcb->Parity);
                switch (dcb->Parity)
                {
                    case 0:
                    {
                        printf("NOPARITY    无校验\n");
                        break;
                    }
                    case 1:
                    {
                        printf("ODDPARITY    奇校验\n");
                        break;
                    }
                    case 2:
                    {
                        printf("EVENPARITY    偶校验\n");
                        break;
                    }
                    case 3:
                    {
                        printf("MARKPARITY    标志校验\n");
                        break;
                    }
                }
                
                printf("3.停止位数        ");// % d\n", dcb->StopBits);
                if (dcb->StopBits == 0)
                    printf("ONESTOPBIT    1停止位\n");
                else if (dcb->StopBits == 1)
                    printf("ONE5STOPBITS    1.5停止位\n");
                else if (dcb->StopBits == 2)
                    printf("TWOSTOPBITS    2停止位\n");
                else
                    printf("dcb->ByteSize = %d\n", dcb->StopBits);

                printf("4.数据位个数        %d    位\n", dcb->ByteSize);
                printf("5.字节数        %d    字节\n", FILESIZE);
                break;
            }
            case 7:
            {
                printf("退出配置\n");
                return;
            }
            default:
            {
                printf("输入有误\n");
                break;
            }
        }
        printf("完毕\n");
    }

}

int main()
{
    
    int Change = 0;

    DCB dcb;
    memset(&dcb, 0, sizeof(dcb));

    /* 
        将char[]类型转化成LPCWSTR类型
    */

    WCHAR wszClassName[8];
    memset(wszClassName, 0, sizeof(wszClassName));
    MultiByteToWideChar(CP_ACP, 0, szStr, strlen(szStr) + 1, wszClassName,
        sizeof(wszClassName) / sizeof(wszClassName[0]));

    LPCWSTR lpFileName = _T("com3"); //= wszClassName;
    
    /*
        DCB结构配置
        BauRate        (波特率)
        fParity        (指定奇偶校验位)
        Parity        (校验方式)
        ByteSize    (数据位个数)
        StopBits    (停止位个数)
    */
    printf("DCB结构正在默认配置...");
    dcb.DCBlength = sizeof(DCB);
    dcb.BaudRate = 9600;
    dcb.Parity = 2;
    dcb.ByteSize = 8;
    dcb.StopBits = ONESTOPBIT;
    printf("完成\n");

    

    while (1)
    {    
        printf("\n  <Win串口读写程序>\n");
        printf("1.读取数据\n");
        printf("2.写入数据\n");
        printf("3.配置DCB结构体\n");
        printf("4.结束程序\n");
        printf(">> ");
        scanf_s("%d", &Change);
        if (Change == 1)
        {
            ReadFileContent(lpFileName,dcb);
        }
        else if (Change == 2)
        {
            WriteFileContent(lpFileName,dcb);
        }
        else if (Change == 3)
        {
            SetDcb(&dcb);
        }
        else if (Change == 4)
        {
            printf("程序结束\n");
            break;
        }
        else
            printf("输入错误,请重新输入!\n");
    }
    
    return 0;
}

 

目前时间紧迫，以后在做注释

参考文献

串口DCB结构体详解 ：

https://blog.csdn.net/wangshubo1989/article/details/47746401

使用win32API实现windows下的一步串口通讯

https://www.cnblogs.com/icemencc/p/6098606.html

使用windowsAPI进行串口编程

https://www.cnblogs.com/milanleon/p/4244267.html

c语言中的串口读写功能实现

https://blog.csdn.net/mrsama/article/details/77140443