Problem When Creating my own Slot

[jacek]

Uncomment Q_OBJECT and re-run qmake.

[jpn]

You should:

• not declare classes with Q_OBJECT macro in a .cpp file but
• place the class declaration in a header file, say CustomSlot.h
• add the header file to the .pro file's HEADERS variable
• continue with what Jacek said

A workaround is to include the moc file in the end of CustomSlot.cpp.

[Fatla]

Thanks fnmblot as well as Thanks again jpn .
It seems that I'm that kind of annoying students who won't stop questioning

I've made what you 've told me & separated the declaration from the implementation .
However , my slot didn't work yet ?!!
+ How does the header file which generated ,ui_Test.h , can call my CustomSlot ?!!

I've changed a little in my App :
Here are my Codes :

=> Main.cpp 's code is :

#include <QApplication>
#include <QDialog>
 
#include "ui_Test.h"
 
int main(int argc, char *argv[])
{
    QApplication app(argc, argv);
 
 
 
QWidget *widget = new QWidget;
     Ui_MyForm ui;
     ui.setupUi(widget);
 
     widget->show();
     return app.exec();
}

#include <QApplication>
#include <QDialog>

#include "ui_Test.h"

int main(int argc, char *argv[])
{
    QApplication app(argc, argv);

    

QWidget *widget = new QWidget;
     Ui_MyForm ui;
     ui.setupUi(widget);

     widget->show();
     return app.exec();
}

To copy to clipboard, switch view to plain text mode 

---------------------------------------------------------------------------------------------------------------


ui_Test.h 's code is :

/********************************************************************************
** Form generated from reading ui file 'Test.ui'
**
** Created: Thu Jun 5 19:58:05 2008
**      by: Qt User Interface Compiler version 4.4.0
**
** WARNING! All changes made in this file will be lost when recompiling ui file!
********************************************************************************/
 
#ifndef UI_TEST_H
#define UI_TEST_H
 
#include <QtCore/QVariant>
#include <QtGui/QAction>
#include <QtGui/QApplication>
#include <QtGui/QButtonGroup>
#include <QtGui/QLineEdit>
#include <QtGui/QPushButton>
#include <QtGui/QWidget>
 
QT_BEGIN_NAMESPACE
 
class Ui_MyForm
{
public:
    QPushButton *btnCreateFile;
    QLineEdit *txtData;
 
    void setupUi(QWidget *MyForm)
    {
    if (MyForm->objectName().isEmpty())
        MyForm->setObjectName(QString::fromUtf8("MyForm"));
    MyForm->resize(533, 393);
    btnCreateFile = new QPushButton(MyForm);
    btnCreateFile->setObjectName(QString::fromUtf8("btnCreateFile"));
    btnCreateFile->setGeometry(QRect(170, 190, 75, 24));
    txtData = new QLineEdit(MyForm);
    txtData->setObjectName(QString::fromUtf8("txtData"));
    txtData->setGeometry(QRect(160, 90, 113, 20));
 
    retranslateUi(MyForm);
    QObject::connect(btnCreateFile, SIGNAL(pressed()), MyForm, SLOT(CreateFile()));
 
    QMetaObject::connectSlotsByName(MyForm);
    } // setupUi
 
    void retranslateUi(QWidget *MyForm)
    {
    MyForm->setWindowTitle(QApplication::translate("MyForm", "Form", 0, QApplication::UnicodeUTF8));
    btnCreateFile->setText(QApplication::translate("MyForm", "PushButton", 0, QApplication::UnicodeUTF8));
    txtData->setText(QString());
    Q_UNUSED(MyForm);
    } // retranslateUi
 
};
 
namespace Ui {
    class MyForm: public Ui_MyForm {};
} // namespace Ui
 
QT_END_NAMESPACE
 
#endif // UI_TEST_H

/********************************************************************************
** Form generated from reading ui file 'Test.ui'
**
** Created: Thu Jun 5 19:58:05 2008
**      by: Qt User Interface Compiler version 4.4.0
**
** WARNING! All changes made in this file will be lost when recompiling ui file!
********************************************************************************/

#ifndef UI_TEST_H
#define UI_TEST_H

#include <QtCore/QVariant>
#include <QtGui/QAction>
#include <QtGui/QApplication>
#include <QtGui/QButtonGroup>
#include <QtGui/QLineEdit>
#include <QtGui/QPushButton>
#include <QtGui/QWidget>

QT_BEGIN_NAMESPACE

class Ui_MyForm
{
public:
    QPushButton *btnCreateFile;
    QLineEdit *txtData;

    void setupUi(QWidget *MyForm)
    {
    if (MyForm->objectName().isEmpty())
        MyForm->setObjectName(QString::fromUtf8("MyForm"));
    MyForm->resize(533, 393);
    btnCreateFile = new QPushButton(MyForm);
    btnCreateFile->setObjectName(QString::fromUtf8("btnCreateFile"));
    btnCreateFile->setGeometry(QRect(170, 190, 75, 24));
    txtData = new QLineEdit(MyForm);
    txtData->setObjectName(QString::fromUtf8("txtData"));
    txtData->setGeometry(QRect(160, 90, 113, 20));

    retranslateUi(MyForm);
    QObject::connect(btnCreateFile, SIGNAL(pressed()), MyForm, SLOT(CreateFile()));

    QMetaObject::connectSlotsByName(MyForm);
    } // setupUi

    void retranslateUi(QWidget *MyForm)
    {
    MyForm->setWindowTitle(QApplication::translate("MyForm", "Form", 0, QApplication::UnicodeUTF8));
    btnCreateFile->setText(QApplication::translate("MyForm", "PushButton", 0, QApplication::UnicodeUTF8));
    txtData->setText(QString());
    Q_UNUSED(MyForm);
    } // retranslateUi

};

namespace Ui {
    class MyForm: public Ui_MyForm {};
} // namespace Ui

QT_END_NAMESPACE

#endif // UI_TEST_H

To copy to clipboard, switch view to plain text mode 

---------------------------------------------------------------------------------------------------------------

=> CustomSlot.h 's code is :

#ifndef CustmSlot_Declaration_H
#define CustmSlot_Declaration_H
#include "ui_Test.h"
 
class CustomSlot: public QWidget
 {
     Q_OBJECT
 
 public:
     CustomSlot(QWidget *parent = 0);
 
 private slots:
     void CreateFile();
 
 
 private:
     Ui_MyForm ui;
 };
#endif

#ifndef CustmSlot_Declaration_H
#define CustmSlot_Declaration_H
#include "ui_Test.h"

class CustomSlot: public QWidget
 {
     Q_OBJECT

 public:
     CustomSlot(QWidget *parent = 0);

 private slots:
     void CreateFile();


 private:
     Ui_MyForm ui;
 };
#endif

To copy to clipboard, switch view to plain text mode 

---------------------------------------------------------------------------------------------------------------

=> CustomSlot.cpp 's code is :

#include"CustomSlot.h"
#include "ui_Test.h"
#include <stdio.h>
 
 
 
 
CustomSlot::CustomSlot(QWidget *parent)
     : QWidget(parent)
 {
     ui.setupUi(this);
 }
 
void CustomSlot:: CreateFile()
 {
    FILE * pFile;
    pFile = fopen ("C:/myfile.txt","w");
 }

#include"CustomSlot.h"
#include "ui_Test.h"
#include <stdio.h>




CustomSlot::CustomSlot(QWidget *parent)
     : QWidget(parent)
 {
     ui.setupUi(this);
 }

void CustomSlot:: CreateFile()
 {
    FILE * pFile;
    pFile = fopen ("C:/myfile.txt","w");
 }

To copy to clipboard, switch view to plain text mode 

Thanks

[jpn]

QWidget *widget = new QWidget;
Ui_MyForm ui;
ui.setupUi(widget);
 
widget->show();

QWidget *widget = new QWidget;
Ui_MyForm ui;
ui.setupUi(widget);

widget->show();

To copy to clipboard, switch view to plain text mode 

No instance of CustomSlot is created anywhere. You instantiate a plain QWidget and use the non-recommended "direct approach". It should be:

CustomSlot widget;
widget.show();

CustomSlot widget;
widget.show();

To copy to clipboard, switch view to plain text mode 

[vycke]

Plus you need to have a

connect(ui->btnCreateFile, SIGNAL(pressed()), this, SLOT(CreateFile()));

line in the constructor of your CustomSlot class.

[jpn]

Plus you need to have a

connect(ui->btnCreateFile, SIGNAL(pressed()), this, SLOT(CreateFile()));

line in the constructor of your CustomSlot class.

Actually that's already done in the generated code. Qt Designer 4.4.0 introduced a way to define custom slots:

* [132874] Added support for user-defined signals and slots of promoted widgets and main container

[Fatla]

Hooooooooray , it's Working Now

Thanks vycke .
Thanks SooOoOo Much jpn . I owe you a lot .

[vycke]

Actually that's already done in the generated code. Qt Designer 4.4.0 introduced a way to define custom slots:

Heh.. missed that in the .ui code -- didn't really look hard though.

Vycke