QTserialport connection - c++

Question

Im trying to use QTserialport to connect to a port via uart
I get QIODevice::read (QSerialPort): device not open this but device is connect as i tested with other applications and with Qserialportinfo I was able to detect the serial port but not connect to it and read from it which part am i doing wrong ??
mainwindow.cpp
#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QDebug>
MainWindow::MainWindow(QWidget *parent)
: QMainWindow(parent)
, ui(new Ui::MainWindow)
{
ui->setupUi(this);
m.setBaudRate(QSerialPort::Baud115200);
m.setDataBits(QSerialPort::Data8);
m.setPortName("COM2");
m.setFlowControl(QSerialPort::NoFlowControl);
m.setParity(QSerialPort::NoParity);
m.setStopBits(QSerialPort::OneStop);
m.setReadBufferSize(1000);
qDebug()<<m.portName();
while(1){
qDebug()<<m.readAll();
}
}
MainWindow::~MainWindow()
{
delete ui;
}
mainwindow.h
#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include <QSerialPort>
#include <QMainWindow>
#include <QSerialPortInfo>
QT_BEGIN_NAMESPACE
namespace Ui { class MainWindow; }
QT_END_NAMESPACE
class MainWindow : public QMainWindow
{
Q_OBJECT
public:
MainWindow(QWidget *parent = nullptr);
~MainWindow();
private:
Ui::MainWindow *ui;
QSerialPort m;
QSerialPortInfo info;
};
#endif // MAINWINDOW_H
ps. I tried to use //./ & \.\ & ////.// & \\.\ before the port but it didnt worked

Answer 1

I believe you have to open the port before reading from it. Try something like this:
if (m.open(QIODevice::ReadOnly)){
while (1){
if (m.waitForReadyRead(1000)){
qDebug() << m.readAll();
}
}
}

Answer 2

after adding m.open() worked perfectly
#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QDebug>
MainWindow::MainWindow(QWidget *parent)
: QMainWindow(parent)
, ui(new Ui::MainWindow)
{
ui->setupUi(this);
m.setBaudRate(QSerialPort::Baud115200);
m.setDataBits(QSerialPort::Data8);
m.setPortName("COM2");
m.setFlowControl(QSerialPort::NoFlowControl);
m.setParity(QSerialPort::NoParity);
m.setStopBits(QSerialPort::OneStop);
m.setReadBufferSize(1000);
m.open(QIODevice::ReadOnly); //after adding this worked perfectly
qDebug()<<m.portName();
while(1){
qDebug()<<m.readAll();
}
}
MainWindow::~MainWindow()
{
delete ui;
}