Qt-Programmierung

Allgemeines zu Qt

Hello World

   helloqt.cpp
   1 #include <qapplication.h>
   2 #include <qlabel.h>
   3
   4 int main(int argc, char* argv[])
   5 {
   6   QApplication myApp(argc, argv);
   7
   8   QLabel* myLabel = new QLabel("Hello world");
   9   myLabel->resize(80, 30);
  10
  11   myApp.setMainWidget(myLabel);
  12   myLabel->show();
  13
  14   return myApp.exec();
  15 }
  

Hello World mit einem Endeknopf

   helloqt2.cpp
   1 #include <qapplication.h>
   2 #include <qlabel.h>
   3 #include <qpushbutton.h>
   4
   5 int main(int argc, char* argv[])
   6 {
   7   QApplication myApp(argc, argv);
   8
   9   QWidget* myWidget = new QWidget();
  10   myWidget->setGeometry(400, 300, 120, 90);
  11
  12   QLabel* myLabel = new QLabel("Hello world", myWidget);
  13   myLabel->resize(80, 30);
  14
  15   QPushButton* myQuitButton = new QPushButton("Quit", myWidget);
  16   myQuitButton->setGeometry(10, 50, 100, 30);
  17   QObject::connect(myQuitButton, SIGNAL(clicked()), &myApp, SLOT(quit()));
  18
  19   myApp.setMainWidget(myWidget);
  20   myWidget->show();
  21
  22   return myApp.exec();
  23 }
  

Signale und Slots

    class MyClass : public QWidget
    {
      Q_OBJECT
       // ...
      signals:
       void machWas();
       // ...
      public slots:
       void slotMachWas();
       // ...
      private slots:
       void slotMachWasAnderes();
       // ...
    }
 

    QObject::connect(mymenu, SIGNAL(activated(int)), 
                     mycodeobject, SLOT( slotDoMenuFunction(int)));
 

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