request for member `show' in `w', which is of non-aggregate type `MainForm*

[Mariane]

I tried using designer to draw a main window in which to include my widget.

But it won't compile :
error: request for member `show' in `w', which is of non-aggregate
type `MainForm*'

Below is the code and commented out are things I've tried...


int main( int argc, char ** argv )
{
QApplication a( argc, argv );
MainForm w;
// MainForm *w = new MainForm;
// MainForm w = new MainForm;
w.show();
a.connect( &a, SIGNAL( lastWindowClosed() ), &a, SLOT( quit() ) );
return a.exec();
}

(I've done the tutorial 2 of the designer and EXACTLY THE SAME main.cpp
compiles fine...)

Mariane

[wysota]

Did you include the header file with your MainForm definition?

[Mariane]

I've got :

#include <qapplication.h>
#include <qvariant.h>
#include <qpixmap.h>
#include <qmainwindow.h>
#include "mainform.h"

as includes in main.cpp... did I forget one?

Mariane

[jacek]

Are you sure you get this error with the version of main() function you have posted above?

[Mariane]

Quite sure, yes. I don't know what I did wrong, though... Maybe I changed
the name of the form after having done "new main.cpp" and this confused
it?

Today I tried using the designer and doing qmake make and "run" after
every change I made. If it compiled, I would save all in another directory,
if it didn't compile I would delete all, close designer, copy back all the files
and re-open the designer.

Once I lost the icon toolbar, once I lost the icon pictures, but I got there in
the end

What does "non-aggregate" mean, anyway?

Thank you all.

Mariane

[jacek]

What does "non-aggregate" mean, anyway?

It means that it's not a struct or class. For example int, char, pointer etc.

The problem is that this error shouldn't happen with such main() function:

int main( int argc, char ** argv )
{
 QApplication a( argc, argv );
 MainForm w;
 w.show();
 a.connect( &a, SIGNAL( lastWindowClosed() ), &a, SLOT( quit() ) );
 return a.exec();
}

int main( int argc, char ** argv )
{
 QApplication a( argc, argv );
 MainForm w;
 w.show();
 a.connect( &a, SIGNAL( lastWindowClosed() ), &a, SLOT( quit() ) );
 return a.exec();
}

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It would occur if you had:

MainForm *w = new MainForm();

MainForm *w = new MainForm();

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or

MainForm *w;

MainForm *w;

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.