QT5.5 serial/terminal example how to send data

[Barney]

using the terminal example I have created another form that is activated from he tool bar of the main window
It has one button on it at the moment
How do i send data to the serial port when I click the button

code for new form

#include "am3x.h"
#include "ui_am3x.h"

AM3x::AM3x(QWidget *parent) :
QDialog(parent),
ui(new Ui::AM3x)
{
ui->setupUi(this);
}

AM3x::~AM3x()
{
delete ui;
}

void AM3x::on_pushButton_clicked()
{

}

THANKS

[mrjj]

well the mainwindow has
QSerialPort *serial;
and you need to do
serial->write( "hello" );

it also has slot to write data called
void writeData(const QByteArray &data);

so you could make signal in AM3x
like

signals:
  void writeData(const QByteArray &data);

connect that signal to the main window slot of same name

and then in
on_pushButton_clicked()
emit writeData(somebytearray);

[Barney]

Thanks
But how do I connect the the signal to the main window slot
am3x.h

#ifndef AM3X_H
#define AM3X_H

#include <QDialog>

namespace Ui {
class AM3x;
}

class AM3x : public QDialog
{
Q_OBJECT
signals:
void writeData(const QByteArray &data);

public:
explicit AM3x(QWidget *parent = 0);
~AM3x();

private slots:
void on_pushButton_clicked();

private:
Ui::AM3x *ui;
};

#endif // AM3X_H

mainwindow.h

/****************************************************************************
**
** 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.
**
** $QT_END_LICENSE$
**
****************************************************************************/

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QtCore/QtGlobal>

#include <QMainWindow>

#include <QtSerialPort/QSerialPort>

#include "am3x.h"

#include "cisco.h"

QT_BEGIN_NAMESPACE

namespace Ui {
class MainWindow;
}

QT_END_NAMESPACE

class Console;
class SettingsDialog;

class MainWindow : public QMainWindow
{
Q_OBJECT

public:
explicit MainWindow(QWidget *parent = 0);
~MainWindow();

private slots:
void openSerialPort();
void closeSerialPort();
void about();
void writeData(const QByteArray &data);
void readData();

void handleError(QSerialPort::SerialPortError error);

void on_actionAM3x_triggered();

void on_actionCISCO_triggered();

private:
void initActionsConnections();

private:
Ui::MainWindow *ui;
Console *console;
SettingsDialog *settings;
QSerialPort *serial;
AM3x *am31;
CISCO *cisco;

};

#endif // MAINWINDOW_H

[mrjj]

hi
in mainwindow
you make an instance of AM3x
i see you have the pointer
so in mainwin constructor u make
am31= new AM3x (); // for using later to show also
//connect
bool res=connect(am31, SIGNAL(writeData( QByteArray ) ), this, SLOT(writeData( QByteArray ) );
qDebug() << " conneted:" << res;

Its best to do in constructor as if you do connect in button where u show AM3x, you will end up with multiple connections.