How to show a QDialog ( Designed ) ?

[Bong.Da.City]

void example::on_pushButton_clicked()
{
    QDialog *gamatos = new QDialog;
    connect(ui->pushButton, SIGNAL(clicked()), hi, SLOT(gamatos->show()));
}

void example::on_pushButton_clicked()
{
    QDialog *gamatos = new QDialog;
    connect(ui->pushButton, SIGNAL(clicked()), hi, SLOT(gamatos->show()));
}

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This doenot work!!!

[Urthas]

Of course it doesn't. You never make a connection in the slot that it is supposed to call.

edit:

void example::on_pushButton_clicked()
{
    QDialog *gamatos = new QDialog;
    connect(ui->pushButton, SIGNAL(clicked()), hi, SLOT(gamatos->show()));
}

void example::on_pushButton_clicked()
{
    QDialog *gamatos = new QDialog;
    connect(ui->pushButton, SIGNAL(clicked()), hi, SLOT(gamatos->show()));
}

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should be something along the lines of

yourClass::yourConstructor(...) : yourParent() {
    ...
    connect(ui->pushButton, SIGNAL(clicked()), hi, SLOT(on_pushButton_clicked());
    ...
}
 
void example::on_pushButton_clicked()
{
    QDialog *gamatos = new QDialog;
    ...
    gamatos->exec();
}

yourClass::yourConstructor(...) : yourParent() {
    ...
    connect(ui->pushButton, SIGNAL(clicked()), hi, SLOT(on_pushButton_clicked());
    ...
}

void example::on_pushButton_clicked()
{
    QDialog *gamatos = new QDialog;
    ...
    gamatos->exec();
}

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You *really* need to read and re-read the signals and slots documentation very carefully until you understand it. A slot isn't a statement, it's a function name, and the connection must be established outside of the slot otherwise the slot *cannot* be called!

[Zlatomir]

You don't connect in the slot...

void example::on_pushButton_clicked()
{
    QDialog *gamatos = new QDialog(this); //you need to pass 'this' as parent so that you don't get a memory leak
    gamatos->show(); //you show the dialog
}

void example::on_pushButton_clicked()
{
    QDialog *gamatos = new QDialog(this); //you need to pass 'this' as parent so that you don't get a memory leak
    gamatos->show(); //you show the dialog
}

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Now the connect "stuff" if you create slots by the autoconnect (in the end of that article) rules you don't need to manually connect (the autoconnect does the connection for you)

Else (and i really recommend this method) you do the connection in the class constructor, something like:

example::example // : parameter passing...
{//...
    connect(ui->NameOfButton, SIGNAL (clicked()), this, SLOT(on_pushButton_clicked()));
//... rest of the constructor code
}

example::example // : parameter passing...
{//...
    connect(ui->NameOfButton, SIGNAL (clicked()), this, SLOT(on_pushButton_clicked()));
//... rest of the constructor code
}

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[Bong.Da.City]

See this... It still doesn't work ..

#include "example.h"
#include "ui_example.h"
#include <QDialog>
 
example::example(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::example)
{
    ui->setupUi(this);
    QDialog *gamatos = new QDialog(this);
    connect(ui->pushButton, SIGNAL(clicked()), hi.ui, SLOT(gamatos()));
 
}
 
example::~example()
{
    delete ui;
}
 
void example::changeEvent(QEvent *e)
{
    QMainWindow::changeEvent(e);
    switch (e->type()) {
    case QEvent::LanguageChange:
        ui->retranslateUi(this);
        break;
    default:
        break;
    }
}
 
void example::on_pushButton_clicked()
{
    connect(ui->pushButton, SIGNAL (clicked()), this, SLOT(on_pushButton_clicked()));
}

#include "example.h"
#include "ui_example.h"
#include <QDialog>

example::example(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::example)
{
    ui->setupUi(this);
    QDialog *gamatos = new QDialog(this);
    connect(ui->pushButton, SIGNAL(clicked()), hi.ui, SLOT(gamatos()));

}

example::~example()
{
    delete ui;
}

void example::changeEvent(QEvent *e)
{
    QMainWindow::changeEvent(e);
    switch (e->type()) {
    case QEvent::LanguageChange:
        ui->retranslateUi(this);
        break;
    default:
        break;
    }
}

void example::on_pushButton_clicked()
{
    connect(ui->pushButton, SIGNAL (clicked()), this, SLOT(on_pushButton_clicked()));
}

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[Urthas]

And where is the gamatos() method, exactly? Stop thrashing. Read your error messages! Look at the code that has been handed to you...

[Zlatomir]

connect(ui->pushButton, SIGNAL(clicked()), this, SLOT(on_pushButton_clicked()));

connect(ui->pushButton, SIGNAL(clicked()), this, SLOT(on_pushButton_clicked()));

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That 'this' is a pointer to the object itself (the main window in your case) and this has the slot that will create and show the dialog (on_pushButton_clicked() in your case )

LE: the slot should be:

void example::on_pushButton_clicked()
{
    QDialog *gamatos = new QDialog(this); //you need to pass 'this' as parent so that you don't get a memory leak
    gamatos->show(); //you show the dialog
}

void example::on_pushButton_clicked()
{
    QDialog *gamatos = new QDialog(this); //you need to pass 'this' as parent so that you don't get a memory leak
    gamatos->show(); //you show the dialog
}

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[hakermania]

I don't know if you understand the problem. I understood the Bong's problem. His has 2 ui files. One ui is its main file. The other ui is specially designed for the QDialog. How to connect the other.ui file with the push Button???

[Zlatomir]

I understood his problem, and the solution is in front of you:

#include "example.h"
#include "ui_example.h"
#include "what_ever_dialog_class_with_ui.h"   //include the header file
 
example::example(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::example)
{
    ui->setupUi(this);
    connect(ui->pushButton, SIGNAL(clicked()), this, SLOT(on_pushButton_clicked()));  //connect... the signal with slot ... 
 
}
 
example::~example()
{
    delete ui;
}
 
void example::on_pushButton_clicked()
{
    //use the other class to instantiate the QDialog or the QDialog derived class (with or without ui) 
    what_ever_dialog_class_with_ui *gamatos = new what_ever_dialog_class_with_ui(this); //you need to pass 'this' as parent so that you don't get a memory leak
    gamatos->show(); //you show the dialog
}
 
void example::changeEvent(QEvent *e)
{
    QMainWindow::changeEvent(e);
    switch (e->type()) {
    case QEvent::LanguageChange:
        ui->retranslateUi(this);
        break;
    default:
        break;
    }
}

#include "example.h"
#include "ui_example.h"
#include "what_ever_dialog_class_with_ui.h"   //include the header file

example::example(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::example)
{
    ui->setupUi(this);
    connect(ui->pushButton, SIGNAL(clicked()), this, SLOT(on_pushButton_clicked()));  //connect... the signal with slot ... 

}

example::~example()
{
    delete ui;
}

void example::on_pushButton_clicked()
{
    //use the other class to instantiate the QDialog or the QDialog derived class (with or without ui) 
    what_ever_dialog_class_with_ui *gamatos = new what_ever_dialog_class_with_ui(this); //you need to pass 'this' as parent so that you don't get a memory leak
    gamatos->show(); //you show the dialog
}

void example::changeEvent(QEvent *e)
{
    QMainWindow::changeEvent(e);
    switch (e->type()) {
    case QEvent::LanguageChange:
        ui->retranslateUi(this);
        break;
    default:
        break;
    }
}

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[Bong.Da.City]

I cannot understand what should i change on what_ever_dialog_class_with_ui ? look what i have done..

#include "example.h"
#include "ui_example.h"
#include "hi.h" //include the header file
 
example::example(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::example)
 
{
ui->setupUi(this);
QDialog *gamatos = new QDialog(this);
connect(ui->pushButton, SIGNAL(clicked()), this, SLOT(on_pushButton_clicked())); //connect... the signal with slot ...
}
 
example::~example()
{
delete ui;
}
 
void example::on_pushButton_clicked()
 
{
//use the other class to instantiate the QDialog or the QDialog derived class (with or without ui)
hi.h *gamatos = new QDialog(this); //you need to pass 'this' as parent so that you don't get a memory leak
gamatos->show(); //you show the dialog
}
 
void example::changeEvent(QEvent *e)
{
QMainWindow::changeEvent(e);
switch (e->type()) {
case QEvent::LanguageChange:
ui->retranslateUi(this);
break;
default:
break;
}
}

#include "example.h"
#include "ui_example.h"
#include "hi.h" //include the header file

example::example(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::example)

{
ui->setupUi(this);
QDialog *gamatos = new QDialog(this);
connect(ui->pushButton, SIGNAL(clicked()), this, SLOT(on_pushButton_clicked())); //connect... the signal with slot ...
}

example::~example()
{
delete ui;
}

void example::on_pushButton_clicked()

{
//use the other class to instantiate the QDialog or the QDialog derived class (with or without ui)
hi.h *gamatos = new QDialog(this); //you need to pass 'this' as parent so that you don't get a memory leak
gamatos->show(); //you show the dialog
}

void example::changeEvent(QEvent *e)
{
QMainWindow::changeEvent(e);
switch (e->type()) {
case QEvent::LanguageChange:
ui->retranslateUi(this);
break;
default:
break;
}
}

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[Zlatomir]

#include "example.h"
#include "ui_example.h"
#include "hi.h"   //include the header file
 
example::example(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::example)
{
    ui->setupUi(this);
 
// note that the declaration of pointer can be done only once
 
    connect(ui->pushButton, SIGNAL(clicked()), this, SLOT(on_pushButton_clicked()));  //connect... the signal with slot ... 
 
}
 
example::~example()
{
    delete ui;
}
 
void example::on_pushButton_clicked()
{
   //use the other class to instantiate the QDialog or the QDialog derived class (with or without ui) 
 
   hi *gamatos = new hi(this);  //this is valid if the class name is "hi"... replace that with your class name  //you need to pass 'this' as parent so that you don't get a memory leak
 
   gamatos->show(); //you show the dialog
}
 
void example::changeEvent(QEvent *e)
{
    QMainWindow::changeEvent(e);
    switch (e->type()) {
    case QEvent::LanguageChange:
        ui->retranslateUi(this);
        break;
    default:
        break;
    }
}

#include "example.h"
#include "ui_example.h"
#include "hi.h"   //include the header file

example::example(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::example)
{
    ui->setupUi(this);

// note that the declaration of pointer can be done only once

    connect(ui->pushButton, SIGNAL(clicked()), this, SLOT(on_pushButton_clicked()));  //connect... the signal with slot ... 

}

example::~example()
{
    delete ui;
}

void example::on_pushButton_clicked()
{
   //use the other class to instantiate the QDialog or the QDialog derived class (with or without ui) 
   
   hi *gamatos = new hi(this);  //this is valid if the class name is "hi"... replace that with your class name  //you need to pass 'this' as parent so that you don't get a memory leak
    
   gamatos->show(); //you show the dialog
}

void example::changeEvent(QEvent *e)
{
    QMainWindow::changeEvent(e);
    switch (e->type()) {
    case QEvent::LanguageChange:
        ui->retranslateUi(this);
        break;
    default:
        break;
    }
}

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NOTE: the code changed a bit... i corrected in the previous post, but you already copied... you can't declare the pointer twice (you don't declare it in the constructor, only in the slot)

[Bong.Da.City]

Ok i founded it.. .But know two Qdialogs are been shown :P

#include "example.h"
#include "ui_example.h"
#include "hi.h" //include the header file
 
example::example(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::example)
 
{
ui->setupUi(this);
connect(ui->pushButton, SIGNAL(clicked()), this, SLOT(on_pushButton_clicked())); //connect... the signal with slot ...
}
 
example::~example()
{
delete ui;
}
 
void example::on_pushButton_clicked()
 
{
//use the other class to instantiate the QDialog or the QDialog derived class (with or without ui)
hi *gamatos = new hi(this); //you need to pass 'this' as parent so that you don't get a memory leak
gamatos->show(); //you show the dialog
}
 
void example::changeEvent(QEvent *e)
{
QMainWindow::changeEvent(e);
switch (e->type()) {
case QEvent::LanguageChange:
ui->retranslateUi(this);
break;
default:
break;
}
}

#include "example.h"
#include "ui_example.h"
#include "hi.h" //include the header file

example::example(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::example)

{
ui->setupUi(this);
connect(ui->pushButton, SIGNAL(clicked()), this, SLOT(on_pushButton_clicked())); //connect... the signal with slot ...
}

example::~example()
{
delete ui;
}

void example::on_pushButton_clicked()

{
//use the other class to instantiate the QDialog or the QDialog derived class (with or without ui)
hi *gamatos = new hi(this); //you need to pass 'this' as parent so that you don't get a memory leak
gamatos->show(); //you show the dialog
}

void example::changeEvent(QEvent *e)
{
QMainWindow::changeEvent(e);
switch (e->type()) {
case QEvent::LanguageChange:
ui->retranslateUi(this);
break;
default:
break;
}
}

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[Zlatomir]

See the constructor... and the edits of my previous posts... you initialize the second dialog twice (create two dialogs... with two pointers that have the same name...)

[Zlatomir]

Or, maybe the name of the slot match the autoconnect rules (i gave you a link in a previous post)

You can rename the slot: something like

void example::openDialog()  //and connect with this slot name
{
//use the other class to instantiate the QDialog or the QDialog derived class (with or without ui)
hi *gamatos = new hi(this); //you need to pass 'this' as parent so that you don't get a memory leak
gamatos->show(); //you show the dialog
}

void example::openDialog()  //and connect with this slot name
{
//use the other class to instantiate the QDialog or the QDialog derived class (with or without ui)
hi *gamatos = new hi(this); //you need to pass 'this' as parent so that you don't get a memory leak
gamatos->show(); //you show the dialog
}

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Or don't connect manually and let autoconnect do the connection

[Bong.Da.City]

Ok it works... Many thanks.. I need it..