visual studio c++ Serial Communication error - c++

Question

I'm going to do serial communication using visual studio c++.
However, when I try to use 'serialport port open', I get an error with the phrase L"//./com3
The error code is c2665, e0289.
Also, there is a possibility that the open port may change from time to time, so please help me to read the port automatically.
serialport.h
#pragma once
#include <windows.h>
#include <iostream>
#include <stdlib.h>
using namespace std;
class SerialPort {
public:
HANDLE hComm;
LPCWSTR COMport;
DWORD dNoOFBytestoWrite;
DWORD dNoOfBytesWritten;
int BufSize;
int Status;
char* SerialBuffer;
char* commandBuffer;
DWORD NoBytesRead;
SerialPort(LPCWSTR COMport, int setBaudRate, int setByteSize, char* commandBuffer, int BufSize);
void Connect(LPCWSTR COMport, int setBaudRate, int setByteSize, char* commandBuffer);
void sendCommand(int setBaudRate, int setByteSize, char* commandBuffer);
void getData();
};
serial.cpp
#include "stdafx.h"
#include <string.h>
#include "SerialPort.h"
SerialPort::SerialPort(LPCWSTR COM, int setBaudRate, int setByteSize, char* commandBuffer, int BufSize) {
this->BufSize = BufSize;
this->SerialBuffer = new char[BufSize];
this->NoBytesRead = BufSize;
Connect(COM, setBaudRate, setByteSize, commandBuffer);
}
void SerialPort::Connect(LPCWSTR COM, int setBaudRate, int setByteSize, char* commandBuffer) {
this->COMport = COM;
this->hComm = CreateFile(COM, GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_EXISTING, 0, NULL); // (port name, read/write , no sharing , no security, open existing port only, non overlapped i/o , null for comm devices)
if (this->hComm == INVALID_HANDLE_VALUE)
cout << "Error in Opening serial port" << endl;
else {
cout << "Opening serial port successful" << endl;
sendCommand(setBaudRate, setByteSize, commandBuffer);
}
}
void SerialPort::sendCommand(int setBaudRate, int setByteSize, char* commandBuffer) {
this->commandBuffer = commandBuffer;
this->dNoOFBytestoWrite = sizeof(commandBuffer);
this->Status = WriteFile(hComm, commandBuffer, dNoOFBytestoWrite, &dNoOfBytesWritten, NULL);
DCB dcbSerialParams = { 0 };
dcbSerialParams.DCBlength = sizeof(dcbSerialParams);
dcbSerialParams.BaudRate = setBaudRate;
dcbSerialParams.ByteSize = setByteSize;
dcbSerialParams.StopBits = ONESTOPBIT;
dcbSerialParams.Parity = NOPARITY;
COMMTIMEOUTS timeouts = { 0 };
timeouts.ReadIntervalTimeout = 10;
timeouts.ReadTotalTimeoutConstant = 10;
timeouts.ReadTotalTimeoutMultiplier = 10;
timeouts.WriteTotalTimeoutConstant = 50;
timeouts.WriteTotalTimeoutMultiplier = 10;
if (this->Status)
cout << "Command Successful" << endl;
else
{
cout << "fail to Command" << endl;
}
}
void SerialPort::getData() {
ReadFile(this->hComm, &*this->SerialBuffer, this->BufSize, &this->NoBytesRead, NULL);
}
main.cpp
#include "stdafx.h"
#include "SerialPort.h"
int main()
{
SerialPort PortOpen( L"//./com3", CBR_115200, 8, "#or", 24);
PortOpen.getData();
PortOpen.getData();
cout << PortOpen.SerialBuffer << endl;
return 0;
}