Slot

[giesbert]

The normal way of using designer created forms is:

create them in designer

in your project, create a class that uses the QtDesigner created ui stuff to build it's UI and implement the logic in the class

in this class you implement the slots, so you can also implement a slot for a button (see the docs, bock, examples...)

in that slot you can show your second form. (MyDesignerClass2.show() ) where MyDesignerClass2 is the class you use for implementing the UI for the second form. It can't be done directly in QtDesigner.

[Revu]

@Geroif:I will try out with it .
Thank You

[Revu]

@Geroif:I think almost is done.But how to declare the second designer form in the scope of first form in its .cpp file.

[goetz]

[quote author="Revu" date="1298372699"]@Geroif:I think almost is done.But how to declare the second designer form in the scope of first form in its .cpp file.[/quote]

The usual way is to have one cpp class per form file (.ui). To use one of the forms in another cpp file, include the headers as you do for ordinary classes too.

[Revu]

@Volker:Thanks for that tip.

Should I have a file(.h) for my second form too?

[goetz]

Yes.

[giesbert]

Of course!

Each form should be a class, and a class should have header and cpp (if its not pure inline or template).
The designer is only some helper tool to not do all the coding for ui representation by hand (what I personally prefer).

[Revu]

am not able to get it done...how could I attach my code with the message to get help ?

[Revu]

Am getting error after compiling.The code is as follows:
@#include <QtGui>

#include "mainwindow.h"
#include "subWindow.h"

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

    mainwindow mWindow;
    mWindow.show();
    subWindow window;
    window.show();

    QObject::connect( &mWindow, SIGNAL(Clicked()),
    &window, SLOT(on_next_clicked()));

    return app.exec();

}
@

the error is:

main.cpp: In function ‘int main(int, char**)’:
main.cpp:10: error: ‘mainwindow’ was not declared in this scope
main.cpp:10: error: expected ‘;’ before ‘mWindow’
main.cpp:11: error: ‘mWindow’ was not declared in this scope
make: *** [main.o] Error 1

please help

[andre]

Are you sure this is the whole output? It seems like something is wrong in your mainwindow.h. Please post both the complete compilation output, and the contents of mainwindow.h.

[goetz]

[quote author="Revu" date="1298453513"]
main.cpp: In function ‘int main(int, char**)’:
main.cpp:10: error: ‘mainwindow’ was not declared in this scope
main.cpp:10: error: expected ‘;’ before ‘mWindow’
main.cpp:11: error: ‘mWindow’ was not declared in this scope
make: *** [main.o] Error 1

please help[/quote]

Seems that you should read some C++ tutorial first. This are some basic error messages from the compiler. You must be familiar with header and implementation files before you can use Qt successfully.

And as Andre already mentioned, it's hard to analyze the error without the contents of mainwindow.h.

[Revu]

the code is as below:
@#ifdef MAINWINDOW_H
#define MAINWINDOW_H

#include<QDialog>
#include"subWindow.h"
#include "ui_main.h"

namespace Ui
{
class mainwindow;
}

class mainwindow:public QDialog,public Ui::main
{
Q_OBJECT

public:
explicit mainwindow(QWidget *parent=0);
~mainwindow();

private slots:
void on_next_click();

};
#endif@

[Revu]

@Volker:Thank You for your advice.

Can you suggest me few online tutorials to understand the concepts clearly?

[Revu]

Am very new to coding so please me for my mistakes.

[goetz]

Change this:

@
#ifdef MAINWINDOW_H
#define MAINWINDOW_H
@

to this:

@
#ifndef MAINWINDOW_H
#define MAINWINDOW_H
@

[andre]

Good catch, Volker!

[Revu]

@Volker: thank you so much I missed to check that.