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On Fri, 17 Oct 2003 00:41:31 +0530 (IST), Himanshu Arora wrote:
> I'm getting some errors in my Qt program which is very hard for me to
> understand as i am new to Qt.
> The code is :
>
>
> #include <qpopupmenu.h>
> #include <qapplication.h>
> #include <qmainwindow.h>
> #include <qmenubar.h>
>
> class ApplicationWindow : public QMainWindow
> {
> Q_OBJECT
> public:
> ApplicationWindow();
> };
>
> ApplicationWindow::ApplicationWindow()
> : QMainWindow(0, "Himanshu Arora", WDestructiveClose )
> {
> QPopupMenu * file = new QPopupMenu(this);
> menuBar()->insertItem("&File", file);
> file->insertItem("&Open", this, SLOT(open()), CTRL+Key_O);
> file->insertItem("E&xit", this, SLOT(quit()), CTRL+Key_X);
> }
>
> int main(int argc, char **argv)
> {
> QApplication a(argc, argv);
> ApplicationWindow *mw = new ApplicationWindow();
> mw->show();
> a.connect( &a, SIGNAL(lastWindowClosed()), &a, SLOT(quit()) );
> return a.exec();
> }
>
>
> -----------------------
> The error which i'm getting is :
> + qmake -project popup.cpp
> + qmake
> + make
> g++ -o popup popup.o -L/usr/lib/qt-3.1/lib -L/usr/X11R6/lib -lqt-mt
> -lXext -lX11 -lm
> popup.o(.text+0x31): In function
> `ApplicationWindow::ApplicationWindow[not-in-charge]()':
> /home/project/learnQt/popup/popup.cpp:18: undefined reference to `vtable
> for ApplicationWindow'
> popup.o(.text+0x38):/home/project/learnQt/popup/popup.cpp:18: undefined
> reference to `vtable for ApplicationWindow'
> popup.o(.text+0x1f1): In function
> `ApplicationWindow::ApplicationWindow[in-charge]()':
> /home/project/learnQt/popup/popup.cpp:18: undefined reference to `vtable
> for ApplicationWindow'
> popup.o(.text+0x1f8):/home/project/learnQt/popup/popup.cpp:18: undefined
> reference to `vtable for ApplicationWindow'
> collect2: ld returned 1 exit status
> make: *** [popup] Error 1
>
> i have to learn Qt within 3 or 4 days is there any good documentation or
> short tutorial apart from that provided by Trolltech. While replying to
> the redhat mailing list please send a Cc to me with the corrected code.
> Please explain the errors also.
> Q_OBJECT
Where's the corresponding code for Qt's Meta Object Compiler? Your
example code looks incomplete. That's why you get a linker error.
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