Problem running a qt app.

alain soucy soucya at videotron.ca
Wed Jun 14 11:13:10 UTC 2000


Salut,

lorsqu'on utilise le mécanisme SIGNAL/SLOT il faut auparavant passer le fichier
à un préprocesseur (MOC). Il ne faut pas oublier aussi, d'ajouter dans le
fichier la macro Q_OBJECT.

voici le code modifié pour qu'il fonctionne :
bonne chance !


//FICHIER  'INCLUDE'
#include <qapplication.h>
#include <qpushbutton.h>
#include <qfont.h>
#include <stdlib.h>
class MyApplication : public QApplication
{
Q_OBJECT
public:
MyApplication (int a, char *t[]);
private:
QPushButton *go;
protected slots:
void slotConnect();

};

//FICHIER SOURCE MODIFIE
#include "test.h"
MyApplication::MyApplication (int a, char *t[]) : QApplication (a, t)
{
go = new QPushButton ("Go !");
go->setFont ( QFont ( "Times", 18, QFont::Bold ) );
setMainWidget (go);
go->show();
connect (go, SIGNAL(clicked()),SLOT(slotConnect()));
}

void MyApplication::slotConnect()
{
system ("kvt &");
}

int main( int argc, char **argv )
{
MyApplication a( argc, argv );
return a.exec();
}

ensuite compiler les fichiers de la facon suivante:

1.  /usr/lib/qt/bin/moc test.h -omoc_test.cpp
2.   g++ test.cpp moc_test.cpp  -lqt -I/usr/lib/qt/include -L/usr/lib/qt/lib
-otest  




Le mer, 14 jun 2000, David BOURIAUD a écrit :
> 
> Hi to all !
> I'm confronted to the following problem :
> I've modified the t2 qt tutorial so as to have a button that would call
> a kvt terminal.
> I'm not writing this app under kdevelop, for, by now, I'd just like to
> know how qt works.
> When I compile the following program, it works fine (eg. The compiler
> does not complain about anything).
> But when I run it, I get the following :
> QObject::connect: No such slot QApplication::slotConnect()
> QObject::connect:  (receiver name: 't2')
> What's wrong with my source code ?
> If anyone could help... Thanks by advance !
> 
> The source code of my file :
> ----------------------- begin of source code
> ------------------------------
> #include <qapplication.h>
> #include <qpushbutton.h>
> #include <qfont.h>
> #include <stdlib.h>
> 
> class MyApplication : public QApplication
> {
> public:
>     MyApplication (int a, char *t[]);
> private:
>     QPushButton *go;
> protected slots:
>     void slotConnect();
> 
> };
> 
> MyApplication::MyApplication (int a, char *t[]) : QApplication (a, t)
> {
>     go = new QPushButton ("Go !");
>     go->setFont ( QFont ( "Times", 18, QFont::Bold ) );
>     setMainWidget (go);
>     go->show();
>     connect (go, SIGNAL(clicked()),SLOT(slotConnect()));
> }
> 
> void MyApplication::slotConnect()
> {
>     system ("kvt &");
> }
> 
> 
> int main( int argc, char **argv )
> {
>     MyApplication a( argc, argv );
>     return a.exec();
> }
> ----------------------- end of source code
> --------------------------------
> 
> The Makefile provided with the t2 tutorial hasn't been modified at all.
> 

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