Qt 5.9 | Qt Serial Port | Blocking Master Example | dialog.cpp Example File

Qt 5.9.4 Reference Documentation

# dialog.cpp Example File

blockingmaster/dialog.cpp

      /****************************************************************************
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      ** Copyright (C) 2012 Denis Shienkov <denis.shienkov@gmail.com>
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      #include "dialog.h"

      #include <QLabel>
      #include <QLineEdit>
      #include <QComboBox>
      #include <QSpinBox>
      #include <QPushButton>
      #include <QGridLayout>

      #include <QtSerialPort/QSerialPortInfo>

      QT_USE_NAMESPACE

      Dialog::Dialog(QWidget *parent)
          : QDialog(parent)
          , transactionCount(0)
          , serialPortLabel(new QLabel(tr("Serial port:")))
          , serialPortComboBox(new QComboBox())
          , waitResponseLabel(new QLabel(tr("Wait response, msec:")))
          , waitResponseSpinBox(new QSpinBox())
          , requestLabel(new QLabel(tr("Request:")))
          , requestLineEdit(new QLineEdit(tr("Who are you?")))
          , trafficLabel(new QLabel(tr("No traffic.")))
          , statusLabel(new QLabel(tr("Status: Not running.")))
          , runButton(new QPushButton(tr("Start")))
      {
          const auto infos = QSerialPortInfo::availablePorts();
          for (const QSerialPortInfo &info : infos)
              serialPortComboBox->addItem(info.portName());

          waitResponseSpinBox->setRange(0, 10000);
          waitResponseSpinBox->setValue(1000);

          auto mainLayout = new QGridLayout;
          mainLayout->addWidget(serialPortLabel, 0, 0);
          mainLayout->addWidget(serialPortComboBox, 0, 1);
          mainLayout->addWidget(waitResponseLabel, 1, 0);
          mainLayout->addWidget(waitResponseSpinBox, 1, 1);
          mainLayout->addWidget(runButton, 0, 2, 2, 1);
          mainLayout->addWidget(requestLabel, 2, 0);
          mainLayout->addWidget(requestLineEdit, 2, 1, 1, 3);
          mainLayout->addWidget(trafficLabel, 3, 0, 1, 4);
          mainLayout->addWidget(statusLabel, 4, 0, 1, 5);
          setLayout(mainLayout);

          setWindowTitle(tr("Blocking Master"));
          serialPortComboBox->setFocus();

          connect(runButton, &QPushButton::clicked, this, &Dialog::transaction);
          connect(&thread, &MasterThread::response, this, &Dialog::showResponse);
          connect(&thread, &MasterThread::error, this, &Dialog::processError);
          connect(&thread, &MasterThread::timeout, this, &Dialog::processTimeout);
      }

      void Dialog::transaction()
      {
          setControlsEnabled(false);
          statusLabel->setText(tr("Status: Running, connected to port %1.")
                               .arg(serialPortComboBox->currentText()));
          thread.transaction(serialPortComboBox->currentText(),
                             waitResponseSpinBox->value(),
                             requestLineEdit->text());
      }

      void Dialog::showResponse(const QString &s)
      {
          setControlsEnabled(true);
          trafficLabel->setText(tr("Traffic, transaction #%1:"
                                   "\n\r-request: %2"
                                   "\n\r-response: %3")
                                .arg(++transactionCount).arg(requestLineEdit->text()).arg(s));
      }

      void Dialog::processError(const QString &s)
      {
          setControlsEnabled(true);
          statusLabel->setText(tr("Status: Not running, %1.").arg(s));
          trafficLabel->setText(tr("No traffic."));
      }

      void Dialog::processTimeout(const QString &s)
      {
          setControlsEnabled(true);
          statusLabel->setText(tr("Status: Running, %1.").arg(s));
          trafficLabel->setText(tr("No traffic."));
      }

      void Dialog::setControlsEnabled(bool enable)
      {
          runButton->setEnabled(enable);
          serialPortComboBox->setEnabled(enable);
          waitResponseSpinBox->setEnabled(enable);
          requestLineEdit->setEnabled(enable);
      }