1. A multi-platform GUI-building program
Using Qt4
A multi-platform GUI-building program

2. Basic steps
Create a directory (myqt) to contain everything. All work is done IN this directory
Start Qt Designer to construct your primary GUI panel
Creates myqt.ui which will LATER be converted into ui_myqt.h
Create main.cpp
it must have this name or you have to modify the .pro file
Run: qmake-qt4 -project {-o xxx}
Creates the initial xxx.pro file
The default (where xxx is myqt) will be the name of the containing directory
Run: qmake-qt4 xxx.Pro
Uses the xxx.pro file to create a makefile
Use a text editor to create xxx.h
Use a text editor to create xxx.cpp
Rewrite main.cpp to use the above files
Re-run: qmake-qt4 –project {-o xxx}
this will add the xxx.cpp file
Re-run: qmake-qt4 xxx.Pro
Run make
Add more C++ code to continue the implementation.
Reference:

3. This is the original “main.cpp” (created by hand)
#include <QApplication> #include <QDialog> #include "ui_xxx.h" int main(int argc, char *argv[]) { QApplication app(argc, argv); Ui::xxx ui; QDialog *dialog = new QDialog; ui.setupUi(dialog); dialog->show(); return app.exec(); }

4. xxx.h created by hand // NOTE there is no “ui_” prefix here
#ifndef xxx_H
#define xxx_H
 #include <QDialog>
#include "ui_xxx.h"
class xxx : public QDialog, public Ui::xxx {
Q_OBJECT
public:
xxx(QWidget *parent = 0);
private slots:
void on_lineEdit_textChanged(); };
#endif

5. NEW main.cpp (after initial build)
#include <QApplication> #include "xxx.h" // NOTE no “ui_” prefix on the name here!! int main(int argc, char *argv[]) { QApplication app(argc, argv); xxx *dialog = new xxx; dialog->show(); return app.exec(); }

6. Files after 1st make. Folder name = qt4GUI
hand-created (textfiles or qt Designer):
djdialog1.ui
djmain.cpp
djdialog1.cpp
djdialog1.h
qt-created
qt4-GUI.pro
ui_djdialog1.h
moc_djdialog1.cpp
Makefile
results of make
djdialog1.0
moc_djdialog1.o
qt4-GUI

7. #include <QtGui> #include "djdialog1
#include <QtGui> #include "djdialog1.h" // note: no "ui_" prefix here #include <sstream> #include <string> int int1, int2, answer; djdialog1::djdialog1(QWidget *parent) : QDialog(parent) { setupUi(this); // initialize my form connect(int1box, SIGNAL(textChanged(const QString &)), this, SLOT(on_int1box_textChanged())); connect(int2box, SIGNAL(textChanged(const QString &)), this, SLOT(on_int2box_textChanged())); connect(GoButton, SIGNAL(clicked()), this, SLOT(accept())); }

8. void djdialog1::on_GoButton_clicked(){
QString qreply;
qreply=QString::number(answer);
answerbox->append(qreply); }
void djdialog1::on_int1box_textChanged(const QString &arg)
{bool ok;
int1 = arg.toInt(&ok,10);
void djdialog1::on_int2box_textChanged(const QString &arg)
int2 = arg.toInt(&ok,10);}