mainwindow.cpp Example File | Qt Serial Port 5.4

- Qt 5.4
- Qt Serial Port
- Terminal Example
- mainwindow.cpp Example File
- Qt 5.4.2 Reference Documentation

# mainwindow.cpp Example File

terminal/mainwindow.cpp

    /****************************************************************************
    **
    ** Copyright (C) 2012 Denis Shienkov <denis.shienkov@gmail.com>
    ** Copyright (C) 2012 Laszlo Papp <lpapp@kde.org>
    ** Contact: http://www.qt-project.org/legal
    **
    ** This file is part of the QtSerialPort module of the Qt Toolkit.
    **
    ** $QT_BEGIN_LICENSE:LGPL21$
    ** Commercial License Usage
    ** Licensees holding valid commercial Qt licenses may use this file in
    ** accordance with the commercial license agreement provided with the
    ** Software or, alternatively, in accordance with the terms contained in
    ** a written agreement between you and Digia. For licensing terms and
    ** conditions see http://qt.digia.com/licensing. For further information
    ** use the contact form at http://qt.digia.com/contact-us.
    **
    ** GNU Lesser General Public License Usage
    ** Alternatively, this file may be used under the terms of the GNU Lesser
    ** General Public License version 2.1 or version 3 as published by the Free
    ** Software Foundation and appearing in the file LICENSE.LGPLv21 and
    ** LICENSE.LGPLv3 included in the packaging of this file. Please review the
    ** following information to ensure the GNU Lesser General Public License
    ** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
    ** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
    **
    ** In addition, as a special exception, Digia gives you certain additional
    ** rights. These rights are described in the Digia Qt LGPL Exception
    ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
    **
    ** $QT_END_LICENSE$
    **
    ****************************************************************************/

    #include "mainwindow.h"
    #include "ui_mainwindow.h"
    #include "console.h"
    #include "settingsdialog.h"

    #include <QMessageBox>
    #include <QtSerialPort/QSerialPort>

    MainWindow::MainWindow(QWidget *parent) :
        QMainWindow(parent),
        ui(new Ui::MainWindow)
    {
        ui->setupUi(this);
        console = new Console;
        console->setEnabled(false);
        setCentralWidget(console);
        serial = new QSerialPort(this);
        settings = new SettingsDialog;

        ui->actionConnect->setEnabled(true);
        ui->actionDisconnect->setEnabled(false);
        ui->actionQuit->setEnabled(true);
        ui->actionConfigure->setEnabled(true);

        initActionsConnections();

        connect(serial, SIGNAL(error(QSerialPort::SerialPortError)), this,
                SLOT(handleError(QSerialPort::SerialPortError)));

        connect(serial, SIGNAL(readyRead()), this, SLOT(readData()));
        connect(console, SIGNAL(getData(QByteArray)), this, SLOT(writeData(QByteArray)));
    }

    MainWindow::~MainWindow()
    {
        delete settings;
        delete ui;
    }

    void MainWindow::openSerialPort()
    {
        SettingsDialog::Settings p = settings->settings();
        serial->setPortName(p.name);
        serial->setBaudRate(p.baudRate);
        serial->setDataBits(p.dataBits);
        serial->setParity(p.parity);
        serial->setStopBits(p.stopBits);
        serial->setFlowControl(p.flowControl);
        if (serial->open(QIODevice::ReadWrite)) {
                console->setEnabled(true);
                console->setLocalEchoEnabled(p.localEchoEnabled);
                ui->actionConnect->setEnabled(false);
                ui->actionDisconnect->setEnabled(true);
                ui->actionConfigure->setEnabled(false);
                ui->statusBar->showMessage(tr("Connected to %1 : %2, %3, %4, %5, %6")
                                           .arg(p.name).arg(p.stringBaudRate).arg(p.stringDataBits)
                                           .arg(p.stringParity).arg(p.stringStopBits).arg(p.stringFlowControl));
        } else {
            QMessageBox::critical(this, tr("Error"), serial->errorString());

            ui->statusBar->showMessage(tr("Open error"));
        }
    }

    void MainWindow::closeSerialPort()
    {
        if (serial->isOpen())
            serial->close();
        console->setEnabled(false);
        ui->actionConnect->setEnabled(true);
        ui->actionDisconnect->setEnabled(false);
        ui->actionConfigure->setEnabled(true);
        ui->statusBar->showMessage(tr("Disconnected"));
    }

    void MainWindow::about()
    {
        QMessageBox::about(this, tr("About Simple Terminal"),
                           tr("The <b>Simple Terminal</b> example demonstrates how to "
                              "use the Qt Serial Port module in modern GUI applications "
                              "using Qt, with a menu bar, toolbars, and a status bar."));
    }

    void MainWindow::writeData(const QByteArray &data)
    {
        serial->write(data);
    }

    void MainWindow::readData()
    {
        QByteArray data = serial->readAll();
        console->putData(data);
    }

    void MainWindow::handleError(QSerialPort::SerialPortError error)
    {
        if (error == QSerialPort::ResourceError) {
            QMessageBox::critical(this, tr("Critical Error"), serial->errorString());
            closeSerialPort();
        }
    }

    void MainWindow::initActionsConnections()
    {
        connect(ui->actionConnect, SIGNAL(triggered()), this, SLOT(openSerialPort()));
        connect(ui->actionDisconnect, SIGNAL(triggered()), this, SLOT(closeSerialPort()));
        connect(ui->actionQuit, SIGNAL(triggered()), this, SLOT(close()));
        connect(ui->actionConfigure, SIGNAL(triggered()), settings, SLOT(show()));
        connect(ui->actionClear, SIGNAL(triggered()), console, SLOT(clear()));
        connect(ui->actionAbout, SIGNAL(triggered()), this, SLOT(about()));
        connect(ui->actionAboutQt, SIGNAL(triggered()), qApp, SLOT(aboutQt()));
    }