read_serial_port.cpp

#include <Windows.h>
#include <iostream>

int main() {
    // Open the serial port
    HANDLE hSerial = CreateFile("COM9", GENERIC_READ, 0, 0, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, 0);

    if (hSerial == INVALID_HANDLE_VALUE) {
        std::cerr << "Error opening serial port\n";
        return 1;
    }else{
        std::cout <<"PORT is open";
    }

    // Set the serial port parameters
    DCB dcbSerialParams = { 0 };
    dcbSerialParams.DCBlength = sizeof(dcbSerialParams);
    if (!GetCommState(hSerial, &dcbSerialParams)) {
        std::cerr << "Error getting serial port state\n";
        CloseHandle(hSerial);
        return 1;
    }

    dcbSerialParams.BaudRate = CBR_115200;
    dcbSerialParams.ByteSize = 8;
    dcbSerialParams.StopBits = ONESTOPBIT;
    dcbSerialParams.Parity = NOPARITY;

    if (!SetCommState(hSerial, &dcbSerialParams)) {
        std::cerr << "Error setting serial port state\n";
        CloseHandle(hSerial);
        return 1;
    }

    // Read data from the serial port
    char buffer[100];
    DWORD bytesRead;

    while (true) {
        if (ReadFile(hSerial, buffer, sizeof(buffer), &bytesRead, NULL)) {
            if (bytesRead > 0) {
                // Process the received data
                std::cout.write(buffer, bytesRead);
            }
        } else {
            std::cerr << "Error reading from serial port\n";
            break;
        }
    }

    // Close the serial port
    CloseHandle(hSerial);

    return 0;
}