custom slots / generated ui

[mboeni]

Using the Designer, I was not really sure what needs to be done where.
So when I try to add the "public slots:" in "generat0rX.h", I get a linker error that states something around

"symbol not found in ui_generat0rX.h"

"symbol not found in ui_generat0rX.h"

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(I am not at my workstation, can post the exact linker error later). When I remove the "public slots:" statements, the code compiles again.

I have created the two additional slots also in Designer (as part of generat0rXClass) by right-clicking on generat0rXClass and editing "Signals/Slots".

On the "isn't valid c++": What is wrong with it? (btw: I copy/pasted it from a Nokia Qt tutorial )

[squidge]

Once you have added slots to a header file, you must invoke the MOC to generate the appropriate dependancies. This is typically done by updating the project (In QtCreator I think is called "run qmake" or similar).

Please post a link to the Nokia Qt tutorial.

[mboeni]

I changed generat0rx.h to this:

#ifndef GENERAT0RX_H
#define GENERAT0RX_H
 
#include <QtGui/QMainWindow>
#include "ui_generat0rx.h"
 
class generat0rX : public QMainWindow
{
	Q_OBJECT
 
public:
	generat0rX(QWidget *parent = 0, Qt::WFlags flags = 0);
	~generat0rX();
 
	//void exit_slot();
	//void addScene2D_slot();
 
	public slots: 
		void exit_slot(void);
		void addScene2D_slot(void);
 
 
private:
	Ui::generat0rXClass ui;
 
};
 
#endif // GENERAT0RX_H

#ifndef GENERAT0RX_H
#define GENERAT0RX_H

#include <QtGui/QMainWindow>
#include "ui_generat0rx.h"

class generat0rX : public QMainWindow
{
	Q_OBJECT

public:
	generat0rX(QWidget *parent = 0, Qt::WFlags flags = 0);
	~generat0rX();

	//void exit_slot();
	//void addScene2D_slot();

	public slots: 
		void exit_slot(void);
		void addScene2D_slot(void);


private:
	Ui::generat0rXClass ui;

};

#endif // GENERAT0RX_H

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which, when compiling gives me this output:

1>------ Build started: Project: generat0rX, Configuration: Debug Win32 ------
1>  Moc'ing include\generat0rx.h...
1>  moc_generat0rx.cpp
1>  generat0rx.cpp
1>  main.cpp
1>  Generating Code...
1>moc_generat0rx.obj : error LNK2019: unresolved external symbol "public: void __thiscall generat0rX::addScene2D_slot(void)" (?addScene2D_slot@generat0rX@@QAEXXZ) referenced in function "public: virtual int __thiscall generat0rX::qt_metacall(enum QMetaObject::Call,int,void * *)" (?qt_metacall@generat0rX@@UAEHW4Call@QMetaObject@@HPAPAX@Z)
1>moc_generat0rx.obj : error LNK2019: unresolved external symbol "public: void __thiscall generat0rX::exit_slot(void)" (?exit_slot@generat0rX@@QAEXXZ) referenced in function "public: virtual int __thiscall generat0rX::qt_metacall(enum QMetaObject::Call,int,void * *)" (?qt_metacall@generat0rX@@UAEHW4Call@QMetaObject@@HPAPAX@Z)
1>E:\workspace\QTProjects\generat0rX\\generat0rX.exe : fatal error LNK1120: 2 unresolved externals
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========

1>------ Build started: Project: generat0rX, Configuration: Debug Win32 ------
1>  Moc'ing include\generat0rx.h...
1>  moc_generat0rx.cpp
1>  generat0rx.cpp
1>  main.cpp
1>  Generating Code...
1>moc_generat0rx.obj : error LNK2019: unresolved external symbol "public: void __thiscall generat0rX::addScene2D_slot(void)" (?addScene2D_slot@generat0rX@@QAEXXZ) referenced in function "public: virtual int __thiscall generat0rX::qt_metacall(enum QMetaObject::Call,int,void * *)" (?qt_metacall@generat0rX@@UAEHW4Call@QMetaObject@@HPAPAX@Z)
1>moc_generat0rx.obj : error LNK2019: unresolved external symbol "public: void __thiscall generat0rX::exit_slot(void)" (?exit_slot@generat0rX@@QAEXXZ) referenced in function "public: virtual int __thiscall generat0rX::qt_metacall(enum QMetaObject::Call,int,void * *)" (?qt_metacall@generat0rX@@UAEHW4Call@QMetaObject@@HPAPAX@Z)
1>E:\workspace\QTProjects\generat0rX\\generat0rX.exe : fatal error LNK1120: 2 unresolved externals
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========

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I pasted the full output so you see what the compiler (MSVS / QT Add-In in my case) does. It says that it does moc things as far as I can tell.

Here is the link to the sample: http://doc.trolltech.com/4.7/qmessagebox.html

[Lesiok]

Did have any CPP file with methods void generat0rX::exit_slot(void) and void generat0rX::addScene2D_slot(void) definitions ?

[squidge]

By "not valid C++", I mean this:

void exit_slot()
      {
      QMessageBox msgBox;
      msgBox.setText("SLOT: exit_slot triggered");
      msgBox.exec();
      }

void exit_slot()
      {
      QMessageBox msgBox;
      msgBox.setText("SLOT: exit_slot triggered");
      msgBox.exec();
      }

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to this:

void generat0rX::exit_slot()
      {
      QMessageBox msgBox;
      msgBox.setText("SLOT: exit_slot triggered");
      msgBox.exec();
      }

void generat0rX::exit_slot()
      {
      QMessageBox msgBox;
      msgBox.setText("SLOT: exit_slot triggered");
      msgBox.exec();
      }

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[mboeni]

@Lesiok:

Yes, the methods are defined here:

#include "generat0rx.h"
#include "qmessagebox.h"
 
 
generat0rX::generat0rX(QWidget *parent, Qt::WFlags flags) : QMainWindow(parent, flags)
{
	ui.setupUi(this);
 
}
 
generat0rX::~generat0rX()
{
 
}
 
 
void generat0rX::exit_slot()
{
	QMessageBox msgBox;
	msgBox.setText("SLOT: exit_slot triggered");
	msgBox.exec();
 
	//qApp->quit();
	//qApp->exit();
}
 
void generat0rX::addScene2D_slot()
{
	QMessageBox msgBox;
	msgBox.setText("SLOT: addScene2D triggered");
	msgBox.exec();
}

#include "generat0rx.h"
#include "qmessagebox.h"


generat0rX::generat0rX(QWidget *parent, Qt::WFlags flags) : QMainWindow(parent, flags)
{
	ui.setupUi(this);

}

generat0rX::~generat0rX()
{

}
 

void generat0rX::exit_slot()
{
	QMessageBox msgBox;
	msgBox.setText("SLOT: exit_slot triggered");
	msgBox.exec();

	//qApp->quit();
	//qApp->exit();
}

void generat0rX::addScene2D_slot()
{
	QMessageBox msgBox;
	msgBox.setText("SLOT: addScene2D triggered");
	msgBox.exec();
}

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Any idea whats wrong?