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Quellcode

#include <QWidget>

class Fenster :public QWidget
{
 Q_OBJECT
public:
 Fenster(QWidget *parent = 0);
 //void setTitle(QString *a);
};

Quellcode

#include "fenster.h"
#include <QtGui>

Fenster::Fenster(QWidget *parent):QWidget(parent)
{
  
}

Quellcode

#include "fenster.h"
#include <QtGui> 

int main(int argc, char *argv[])
{
 QApplication app(argc, argv);
 
 Fenster eins;
 
 
 return app.exec();
}

Quellcode

main.o: In function `main':                                                             
main.cpp:(.text+0x47): undefined reference to `Fenster::Fenster(QWidget*)'              
main.cpp:(.text+0x56): undefined reference to `vtable for Fenster'
main.cpp:(.text+0x5e): undefined reference to `vtable for Fenster'                      
main.cpp:(.text+0x9c): undefined reference to `vtable for Fenster'
main.cpp:(.text+0xa4): undefined reference to `vtable for Fenster'                      
collect2: ld returned 1 exit status                                                     
make: *** [fenster] Fehler 1