基于Visual Studio 2019编写出关于温湿度的上位机代码

好的，以下是一个简单的基于Visual Studio 2019编写的温湿度上位机代码：

#include <iostream>
#include <fstream>
#include <cstdlib>
#include <string>
#include <Windows.h>
#include <conio.h>
#include <iomanip>
#include <sstream>
using namespace std;
HANDLE hcom;
DCB dcb;
COMMTIMEOUTS timeouts;
int baudRate = 9600;
int dataBits = 8;
int stopBits = ONESTOPBIT;
int parity = NOPARITY;
int flowControl = 0;

void OpenPort()//打开端口
{
    hcom = CreateFile("COM3", GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_EXISTING, 0, NULL);
    if (hcom == INVALID_HANDLE_VALUE)
    {
        cout << "打开串口失败！" << endl;
        exit(0);
    }
    dcb.DCBlength = sizeof(dcb);
    GetCommState(hcom, &dcb);//获取当前DCB
    dcb.BaudRate = baudRate;//波特率
    dcb.ByteSize = dataBits;//数据位
    dcb.StopBits = stopBits;//停止位
    dcb.Parity = parity;//奇偶校验
    SetCommState(hcom, &dcb);//配置当前DCB
    timeouts.ReadIntervalTimeout = 50;
    timeouts.ReadTotalTimeoutMultiplier = 10;
    timeouts.ReadTotalTimeoutConstant = 50;
    timeouts.WriteTotalTimeoutMultiplier = 10;
    timeouts.WriteTotalTimeoutConstant = 50;
    SetCommTimeouts(hcom, &timeouts);//配置超时
}

void ClosePort()//关闭端口
{
    CloseHandle(hcom);
}

void SendData()//发送数据
{
    DWORD dwBytesWrite;
    char sendData[] = "1";//发送数据
    WriteFile(hcom, sendData, sizeof(sendData), &dwBytesWrite, NULL);
}

string ReadData()//读取并返回数据
{
    DWORD dwBytesRead;
    char readData[50];
    ReadFile(hcom, readData, sizeof(readData), &dwBytesRead, NULL);
    string str(readData);
    return str;
}

int main()
{
    OpenPort();//打开端口
    while (true)
    {
        SendData();//发送数据
        string data = ReadData();//读取数据
        stringstream ss(data);
        float temp, humid;
        ss >> temp >> humid;//解析温湿度数据
        cout << fixed << setprecision(2) << "温度：" << temp << "℃，湿度：" << humid << "%" << endl;
        Sleep(1000);
    }
    ClosePort();//关闭端口
    return 0;
}

注意：代码中的串口号需要根据实际情况进行修改。