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

  1. #1
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    Question request for member `show' in `w', which is of non-aggregate type `MainForm*

    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

  2. #2
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    Default Re: request for member `show' in `w', which is of non-aggregate type `MainForm*

    Did you include the header file with your MainForm definition?

  3. #3
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    Default Re: request for member `show' in `w', which is of non-aggregate type `MainForm*

    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

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

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

  5. #5
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    Default Re: request for member `show' in `w', which is of non-aggregate type `MainForm*

    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

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

    Quote Originally Posted by Mariane
    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:
    Qt Code:
    1. int main( int argc, char ** argv )
    2. {
    3. QApplication a( argc, argv );
    4. MainForm w;
    5. w.show();
    6. a.connect( &a, SIGNAL( lastWindowClosed() ), &a, SLOT( quit() ) );
    7. return a.exec();
    8. }
    To copy to clipboard, switch view to plain text mode 

    It would occur if you had:
    Qt Code:
    1. MainForm *w = new MainForm();
    To copy to clipboard, switch view to plain text mode 
    or
    Qt Code:
    1. MainForm *w;
    To copy to clipboard, switch view to plain text mode 
    .

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