用C++读取COM端口数据

#include<windows.h>
#include<iostream>
#include<string>

using namespace std;

int main()
{
    // 打开COM端口
    HANDLE hSerial = CreateFile(L"COM3",
        GENERIC_READ | GENERIC_WRITE,
        0,
        NULL,
        OPEN_EXISTING,
        FILE_ATTRIBUTE_NORMAL,
        NULL);

    if (hSerial == INVALID_HANDLE_VALUE) {
        cout << "Error: Unable to open COM port"<< endl;
        return 1;
    }

    // 设置COM端口参数
    DCB dcbSerialParams = { 0 };
    dcbSerialParams.DCBlength = sizeof(dcbSerialParams);
    if (!GetCommState(hSerial, &dcbSerialParams)) {
        cout << "Error: Unable to get COM port parameters"<< endl;
        CloseHandle(hSerial);
        return 1;
    }

    dcbSerialParams.BaudRate = CBR_9600;
    dcbSerialParams.ByteSize = 8;
    dcbSerialParams.StopBits = ONESTOPBIT;
    dcbSerialParams.Parity = NOPARITY;
    if (!SetCommState(hSerial, &dcbSerialParams)) {
        cout << "Error: Unable to set COM port parameters"<< endl;
        CloseHandle(hSerial);
        return 1;
    }

    // 读取COM端口数据
    char buffer[256];
    DWORD bytesRead;
    if (!ReadFile(hSerial, buffer, sizeof(buffer) - 1, &bytesRead, NULL)) {
        cout << "Error: Unable to read from COM port"<< endl;
        CloseHandle(hSerial);
        return 1;
    }

    // 输出读取到的数据
    buffer[bytesRead] = '\0';
    cout << "Received data: "<< buffer<< endl;

    // 关闭COM端口
    CloseHandle(hSerial);

    return 0;
}