Serial data capture through timer (since timer is implemented as thread)

1) declare slots in header file and
2) define them in its .cpp file

mainwindow.h

#ifndef MAINWINDOW_H

#define MAINWINDOW_H

#include <QMainWindow>

#include <QSerialPort>

#include <QDebug>

#include<QTimer>

namespace Ui {

class MainWindow;

}

class MainWindow : public QMainWindow

{

    Q_OBJECT

    QTimer *dataCaptTimer;

    QSerialPort serial;

public:

    explicit MainWindow(QWidget *parent = 0);

    ~MainWindow();

private slots:

    void on_start_btn_pressed();

    void on_stop_btn_pressed();

private:

    Ui::MainWindow *ui;

public slots:

    void startDataCapture();

    void stopDataCapture();

};

#endif // MAINWINDOW_H

mainwindow.cpp file

#include "mainwindow.h"
#include "ui_mainwindow.h"

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    dataCaptTimer=new QTimer;
    dataCaptTimer->setInterval(50);
    connect(dataCaptTimer,SIGNAL(timeout()),this,SLOT(startDataCapture()));

    ui->setupUi(this);

    serial.setPortName("COM6");
    serial.setBaudRate(QSerialPort::Baud9600);
    serial.setDataBits(QSerialPort::Data8);
    serial.setStopBits(QSerialPort::OneStop);
    serial.setFlowControl(QSerialPort::NoFlowControl);
    serial.setParity(QSerialPort::NoParity);
}

MainWindow::~MainWindow()
{
    serial.close();
    delete ui;
}

void MainWindow::on_start_btn_pressed()
{    
    startDataCapture();
}

void MainWindow::on_stop_btn_pressed()
{
     serial.close();
     dataCaptTimer->stop();
}

void MainWindow::startDataCapture()
{
    dataCaptTimer->stop();         //stop timer so that it doesn't generate timeout() interrupt signals while capturing data
    serial.open(QIODevice::ReadWrite);
    char buffer[50];
    serial.waitForReadyRead();
    serial.readLine(buffer, 50);
    qDebug()<<buffer;
    dataCaptTimer->start();        //restart the timer
}