QT C++ how to solve problems?

Question

Qt

/****************************************************************************
**
** Copyright (C) 2012 Denis Shienkov <[email protected]>
** Copyright (C) 2012 Laszlo Papp <[email protected]>
** Contact: http://www.qt.io/licensing/
**
** This file is part of the QtSerialPort module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL21$
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**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
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** LICENSE.LGPLv3 included in the packaging of this file. Please review the
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****************************************************************************/

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

#include <QMessageBox>
#include <QLabel>
#include <QtSerialPort/QSerialPort>
#include <QtSql>
#include <QtDebug>


//! [0]
MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
//! [0]
    ui->setupUi(this);
    console = new Console;
    console->setEnabled(false);
    setCentralWidget(console);
//! [1]
    serial = new QSerialPort(this);
//! [1]
    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, SIGNAL(error(QSerialPort::SerialPortError)), this,
            SLOT(handleError(QSerialPort::SerialPortError)));

//! [2]
    connect(serial, SIGNAL(readyRead()), this, SLOT(readData()));
//! [2]
    connect(console, SIGNAL(getData(QByteArray)), this, SLOT(writeData(QByteArray)));
//! [3]
}
//! [3]

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

//! [4]
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"));
    }
}
//! [4]

//! [5]
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"));
}
//! [5]

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."));
}

//! [6]
void MainWindow::writeData(const QByteArray &data)
{
    serial->write(data);
}
//! [6]

//! [7]
void MainWindow::readData()
{
    QByteArray data = serial->readAll();
    console->putData(data); ---------------------------------------------------------------------------------------------
    QSqlDatabase db = QSqlDatabase::addDatabase("QMYSQL");
        db.setHostName("localhost");
        db.setDatabaseName("Test");
        db.setUserName("root");
        db.setPassword("");
        bool ok = db.open();
        QSqlQuery query;
           query.exec("INSERT INTO Logika (id, predloz, suba) "
                "VALUES ('(data)',fsafsfa, ' dsa')");
}
//! [7]

//! [8]
void MainWindow::handleError(QSerialPort::SerialPortError error)
{
    if (error == QSerialPort::ResourceError) {
        QMessageBox::critical(this, tr("Critical Error"), serial->errorString());
        closeSerialPort();
    }
}
//! [8]

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()));
}

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

This code prints data from the port

QByteArray data = serial->readAll();
    console->putData(data); ---------------------------------------------------------------------------------------------
    QSqlDatabase db = QSqlDatabase::addDatabase("QMYSQL");
        db.setHostName("localhost");
        db.setDatabaseName("Test");
        db.setUserName("root");
        db.setPassword("");
        bool ok = db.open();
        QSqlQuery query;
           query.exec("INSERT INTO Logika (id, predloz, suba) "
                "VALUES ('(data)',fsafsfa, ' dsa')");
}

How to pass console->putData(data) value to DB?

Answer 1

Transfer is simple: make a request with your data and send it to the database.