custom slots / generated ui

**mboeni** · 14th October 2010, 17:54

Ok, I tried it the manual way also: I removed the two custom slots and the connection in designer and did it in code. My class now looks like this:

generat0rx.h

Qt Code:

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

public:
	generat0rX(QWidget *parent = 0, Qt::WFlags flags = 0);
	~generat0rX();
	
	public slots: 
		void exit_slot(void);
		void addScene2D_slot(void);

private:
	Ui::generat0rXClass ui;
};

#endif // GENERAT0RX_H

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and generat0rx.cpp

Qt Code:

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#include "generat0rx.h"
#include "qmessagebox.h"
 
 
generat0rX::generat0rX(QWidget *parent, Qt::WFlags flags) : QMainWindow(parent, flags)
{
	ui.setupUi(this);
	QObject::connect(actionExit, SIGNAL(activated()), this, SLOT(exit_slot()));
    QObject::connect(actionNew_2D_Scene, SIGNAL(activated()), this, SLOT(addScene2D_slot()));
}
 
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);
	QObject::connect(actionExit, SIGNAL(activated()), this, SLOT(exit_slot()));
    QObject::connect(actionNew_2D_Scene, SIGNAL(activated()), this, SLOT(addScene2D_slot()));
}

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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Now the above error is gone but I get a runtime exception:

Qt Code:

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>	QtCored4.dll!QObject::connect(const QObject * sender=0x00690000, const char * signal=0x00c5d294, const QObject * receiver=0x0026f5c0, const char * method=0x00c5d270, Qt::ConnectionType type=AutoConnection)  Line 2483 + 0x8 bytes	C++
 	generat0rX.exe!generat0rX::generat0rX(QWidget * parent=0x00000000, QFlags<enum Qt::WindowType> flags={...})  Line 8 + 0x31 bytes	C++
 	generat0rX.exe!main(int argc=1, char * * argv=0x0069f9f0)  Line 24 + 0x1d bytes	C++
 	generat0rX.exe!WinMain(HINSTANCE__ * instance=0x00980000, HINSTANCE__ * prevInstance=0x00000000, char * __formal=0x00072b9a, int cmdShow=1)  Line 131 + 0x12 bytes	C++
 	generat0rX.exe!__tmainCRTStartup()  Line 547 + 0x2c bytes	C
 	generat0rX.exe!WinMainCRTStartup()  Line 371	C

>	QtCored4.dll!QObject::connect(const QObject * sender=0x00690000, const char * signal=0x00c5d294, const QObject * receiver=0x0026f5c0, const char * method=0x00c5d270, Qt::ConnectionType type=AutoConnection)  Line 2483 + 0x8 bytes	C++
 	generat0rX.exe!generat0rX::generat0rX(QWidget * parent=0x00000000, QFlags<enum Qt::WindowType> flags={...})  Line 8 + 0x31 bytes	C++
 	generat0rX.exe!main(int argc=1, char * * argv=0x0069f9f0)  Line 24 + 0x1d bytes	C++
 	generat0rX.exe!WinMain(HINSTANCE__ * instance=0x00980000, HINSTANCE__ * prevInstance=0x00000000, char * __formal=0x00072b9a, int cmdShow=1)  Line 131 + 0x12 bytes	C++
 	generat0rX.exe!__tmainCRTStartup()  Line 547 + 0x2c bytes	C
 	generat0rX.exe!WinMainCRTStartup()  Line 371	C

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and the debugger points to this line in "qobject.cpp":

Qt Code:

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const QMetaObject *smeta = sender->metaObject();

const QMetaObject *smeta = sender->metaObject();

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Any ideas?

**boudie** · 15th October 2010, 11:39

Your toolbar probably contains one or more QToolButtons. When such button is clicked, the clicked signal for that button is emitted. To react to the signal, you must have in the constructor of your class something like this:

Qt Code:

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connect(myButton, SIGNAL(clicked()), this, SLOT(mySlot()));

connect(myButton, SIGNAL(clicked()), this, SLOT(mySlot()));

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Then every time the button is clicked, the code in function mySlot() is executed.

In your GeneratorClass.h you have something like:

Qt Code:

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private slots:
    void mySlot();

private slots:
    void mySlot();

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And.. please read the Qt-docs about signals and slots. It really helps...

**Ceelaz** · 15th October 2010, 11:54

Try the signal "triggered()" of your actions instead of "activated()":

#
QObject::connect(actionExit, SIGNAL(triggered()), this, SLOT(exit_slot()));
#
QObject::connect(actionNew_2D_Scene, SIGNAL(triggered()), this, SLOT(addScene2D_slot()));

**mboeni** · 15th October 2010, 13:35

Hi all

First of all, thanks for the input! Alas, none of it worked.

I tried something very simple and get exceptions too. So I assume the problem is rooted deeper. I have added a simple widget manipulation to generat0rx.cpp:

Qt Code:

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#include "generat0rx.h"
#include "qmessagebox.h"
#include <QxtLogger>
#include <QxtBasicFileLoggerEngine>
 
generat0rX::generat0rX(QWidget *parent, Qt::WFlags flags) : QMainWindow(parent, flags)
{
	ui.setupUi(this);
	//QObject::connect(actionExit, SIGNAL(activated()), this, SLOT(exit_slot()));
    //QObject::connect(actionNew_2D_Scene, SIGNAL(activated()), this, SLOT(addScene2D_slot()));
 
	//Start logging
	qxtLog->addLoggerEngine("FileLogger", new QxtBasicFileLoggerEngine("log/g0x.log"));
	qxtLog->info("Huhu INFO log entry!");
 
 
	outputTabTextEdit->append("TEST");
}
 
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"
#include <QxtLogger>
#include <QxtBasicFileLoggerEngine>

generat0rX::generat0rX(QWidget *parent, Qt::WFlags flags) : QMainWindow(parent, flags)
{
	ui.setupUi(this);
	//QObject::connect(actionExit, SIGNAL(activated()), this, SLOT(exit_slot()));
    //QObject::connect(actionNew_2D_Scene, SIGNAL(activated()), this, SLOT(addScene2D_slot()));

	//Start logging
	qxtLog->addLoggerEngine("FileLogger", new QxtBasicFileLoggerEngine("log/g0x.log"));
	qxtLog->info("Huhu INFO log entry!");


	outputTabTextEdit->append("TEST");
}

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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This line was added in the constructor:

Qt Code:

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outputTabTextEdit->append("TEST");

outputTabTextEdit->append("TEST");

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and even THIS raises an exception. There must be something fundamentally wrong with the way I call ui elements...(I am using multiple inheritance btw). Just to make sure you get the full picture, here is generat0rx.h as well:

Qt Code:

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

public:
	generat0rX(QWidget *parent = 0, Qt::WFlags flags = 0);
	~generat0rX();
	
	public slots: 
		void exit_slot(void);
		void addScene2D_slot(void);

private:
	Ui::generat0rXClass ui;
};
#endif // GENERAT0RX_H

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This is getting really frustrating :s

Here is the call stack:

Qt Code:

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>	QtGuid4.dll!QTextEdit::append(const QString & text="TEST")  Line 2617 + 0x7 bytes	C++
 	generat0rX.exe!generat0rX::generat0rX(QWidget * parent=0x00000000, QFlags<enum Qt::WindowType> flags={...})  Line 17 + 0x2e bytes	C++
 	generat0rX.exe!main(int argc=1, char * * argv=0x0079fab0)  Line 17 + 0x1d bytes	C++
 	generat0rX.exe!WinMain(HINSTANCE__ * instance=0x01040000, HINSTANCE__ * prevInstance=0x00000000, char * __formal=0x000a2b9a, int cmdShow=1)  Line 131 + 0x12 bytes	C++
 	generat0rX.exe!__tmainCRTStartup()  Line 547 + 0x2c bytes	C
 	generat0rX.exe!WinMainCRTStartup()  Line 371	C
 	kernel32.dll!76e31194() 	
 	[Frames below may be incorrect and/or missing, no symbols loaded for kernel32.dll]	
 	ntdll.dll!775eb495() 	
 	ntdll.dll!775eb468()

>	QtGuid4.dll!QTextEdit::append(const QString & text="TEST")  Line 2617 + 0x7 bytes	C++
 	generat0rX.exe!generat0rX::generat0rX(QWidget * parent=0x00000000, QFlags<enum Qt::WindowType> flags={...})  Line 17 + 0x2e bytes	C++
 	generat0rX.exe!main(int argc=1, char * * argv=0x0079fab0)  Line 17 + 0x1d bytes	C++
 	generat0rX.exe!WinMain(HINSTANCE__ * instance=0x01040000, HINSTANCE__ * prevInstance=0x00000000, char * __formal=0x000a2b9a, int cmdShow=1)  Line 131 + 0x12 bytes	C++
 	generat0rX.exe!__tmainCRTStartup()  Line 547 + 0x2c bytes	C
 	generat0rX.exe!WinMainCRTStartup()  Line 371	C
 	kernel32.dll!76e31194() 	
 	[Frames below may be incorrect and/or missing, no symbols loaded for kernel32.dll]	
 	ntdll.dll!775eb495() 	
 	ntdll.dll!775eb468()

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**Lykurg** · 16th October 2010, 08:18

You are mixing the different approaches of using ui files: See "Using a Designer UI File in Your Application" at the docs.
Use

Qt Code:

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setupUi(this);

setupUi(this);

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instead of

Qt Code:

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ui.setupUi(this);

ui.setupUi(this);

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and rerun qmake.

**mboeni** · 18th October 2010, 15:57

Hi Lykurg

I have read the article you mentioned, but missed the part about setupUI. Changing that as you proposed has solved my main issues. Thanks!

Cheers,
Michael

**mboeni** · 20th October 2010, 14:21

For all other newbies out there, I have put together a little tutorial on how to master the first few steps with Qt4 and MS Visual Studio using the Add-In.

You find the tutorial here: Beginners Tutorial Qt 4.7 with Visual Studio and the Qt Add-In

Please comment or PM me in the blog if you find any errors.

All the best,
Michael

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