Qt 5.9 | Qt Serial Port | Terminal Example | mainwindow.cpp Example File

Qt 5.9.4 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: https://www.qt.io/licensing/
      **
      ** This file is part of the QtSerialPort module of the Qt Toolkit.
      **
      ** $QT_BEGIN_LICENSE:BSD$
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      ** Alternatively, you may use this file under the terms of the BSD license
      ** as follows:
      **
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      ** modification, are permitted provided that the following conditions are
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      #include "mainwindow.h"
      #include "ui_mainwindow.h"
      #include "console.h"
      #include "settingsdialog.h"

      #include <QMessageBox>
      #include <QLabel>
      #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);

          status = new QLabel;
          ui->statusBar->addWidget(status);

          initActionsConnections();

          connect(serial, static_cast<void (QSerialPort::*)(QSerialPort::SerialPortError)>(&QSerialPort::error),
                  this, &MainWindow::handleError);

          connect(serial, &QSerialPort::readyRead, this, &MainWindow::readData);
          connect(console, &Console::getData, this, &MainWindow::writeData);
      }

      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);
              showStatusMessage(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());

              showStatusMessage(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);
          showStatusMessage(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, &QAction::triggered, this, &MainWindow::openSerialPort);
          connect(ui->actionDisconnect, &QAction::triggered, this, &MainWindow::closeSerialPort);
          connect(ui->actionQuit, &QAction::triggered, this, &MainWindow::close);
          connect(ui->actionConfigure, &QAction::triggered, settings, &SettingsDialog::show);
          connect(ui->actionClear, &QAction::triggered, console, &Console::clear);
          connect(ui->actionAbout, &QAction::triggered, this, &MainWindow::about);
          connect(ui->actionAboutQt, &QAction::triggered, qApp, &QApplication::aboutQt);
      }

      void MainWindow::showStatusMessage(const QString &message)
      {
          status->setText(message);
      }