[Qt-interest] Communication Problem

[Sujan Dasmahapatra]

Thakns Sean its working now.its because of the forward declaration of the class.

Kind Regards,
Sujan Dasmahapatra

-----Original Message-----
From: qt-interest-bounces at trolltech.com [mailto:qt-interest-bounces at trolltech.com] On Behalf Of Sean Harmer
Sent: Friday, May 15, 2009 3:58 PM
To: qt-interest at trolltech.com
Subject: Re: [Qt-interest] Communication Problem

Hi,

On Friday 15 May 2009 11:20:31 Sujan Dasmahapatra wrote:
> When I include tablewidget.h in mainwindow.h and mainwindow.h in
> tablewidget.h I am getting the following error.
> ///////////////////////////////////////////////////////////////////////////
>//////////////////////////////////////// In file included from
> tablewidget.h:9,
>                  from tablewidget.cpp:3:
> mainwindow.h:104: error: ISO C++ forbids declaration of `TableWidget' with
> no type mainwindow.h:104: error: expected `;' before '*' token
> make: *** [obj/tablewidget.o] Error 1
> ///////////////////////////////////////////////////////////////////////////
>//////////////////////////// Kind Regards,
Just store a pointer to the MainWindow in your TableWidget and vice versa. 
That way you only need forward declarations of the other class in each header 
file.

i.e. in mainwindow.h

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

class TableWidget;

class MainWindow {
private:
	TableWidget* m_tableWidget;
	<other mainwindow stuff>
};

#endif


then in tablewidget.h

#ifndef TABLEWIDGET_H
#define TABLEWIDGET_H

class MainWindow;

class TableWidget {
private:
	MainWindow* m_mainWindow;
	<other TableWidget stuff>
}

#endif

Then when you need functions from the other class just #include the header 
file in your .cpp implementation files.

HTH,

Sean

> Sujan Dasmahapatra
>
> -----Original Message-----
> From: qt-interest-bounces at trolltech.com
> [mailto:qt-interest-bounces at trolltech.com] On Behalf Of Srdjan Todorovic
> Sent: Friday, May 15, 2009 3:47 PM
> To: qt-interest at trolltech.com
> Subject: Re: [Qt-interest] Communication Problem
>
> 2009/5/15 Sujan Dasmahapatra <sdh at lmglasfiber.com>:
> > Dear friends
> >
> > I’m sorry this is a C++ question.
> >
> > I have two classes MainWindow and TableWidget…..I want to communicate in
> > both directions.Can I include MainWindow in TableWidget and TableWidget
> > in MainWindow…….Its giving error…….what is the solution can anyone plss
> > tell me ??
>
> I don't understand what you mean by this. Can you provide us with more
> information?
> An exact error message or something, so we don't have to forever keep
> guessing what the problem with your code is.
>
> Srdjan
>
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