Development/Tutorials/Programming Tutorial KDE 4

    From KDE TechBase
    Revision as of 03:51, 30 August 2006 by Tstaerk (talk | contribs)

    This is a tutorial to learn KDE programming by examples. It assumes you are working with KDE 4, not KDE 3 (see build_unstable for how to build it).


    Start To learn KDE programming, first read this: http://developer.kde.org/~wheeler/cpp-pitfalls.html

    Your first program shall greet the world with a friendly "hello world", what else ? For that, we will use a KMessageBox. To get more information about the KMessageBox-Class, type "kde: kmessagebox" in your konqueror and it will redirect you to http://developer.kde.org/documentation/library/cvs-api/kdelibs-apidocs/kdeui/html/classKMessageBox.html

    #include <QString>
    #include <kapplication.h>
    #include <kaboutdata.h>
    #include <kmessagebox.h>
    #include <kcmdlineargs.h> 
    
    int main (int argc, char *argv[])
    {
      KAboutData aboutData( "test", "test",
          "1.0", "test", KAboutData::License_GPL,
          "(c) 2006" );
      KCmdLineArgs::init( argc, argv, &aboutData );
      KApplication khello;
      KGuiItem kgi(QString("Hello"),QString(),QString("this is a tooltip"),QString("this is whatsthis"));
      KMessageBox::questionYesNo(0,"text","caption",kgi);
    }
    

    If you set up your environment as in KDE3To4, you can compile this code with

    gcc hello.cpp -o hello -I/home/kde-devel/qt-unstable/include/Qt  -I/home/kde-devel/qt-unstable/include/Qt-Core \
    -I/home/kde-devel/qt-unstable/include -I/home/kde-devel/kde/include  -L/home/kde-devel/kde/lib \
    -L/home/kde-devel/qt-unstable/lib -lkdeui -lkdecore -ldl      
    

    and then run it with ./hello