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Thread: compile issue, syntax i guess, but can't find it

  1. #1
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    Default compile issue, syntax i guess, but can't find it

    archiv.h
    Qt Code:
    1. class Archives : public QDialog
    2. {
    3. Q_OBJECT
    4.  
    5. public:
    6. Archives( QWidget *parent = 0 );
    7. ~Archives();
    8. QString getFileName( const QModelIndex &);
    9. ...
    To copy to clipboard, switch view to plain text mode 
    archiv.cpp
    Qt Code:
    1. //****************************************************************
    2. QString Archives::getFileName( const QModelIndex & idx )
    3. {
    4. return model->data(idx.sibling(idx.row(), 0)).toString();
    5. }
    To copy to clipboard, switch view to plain text mode 

    and menu.cpp
    Qt Code:
    1. //****************************************************************
    2. void ApplicationWindow::archives()
    3. {
    4. Archives Archives_dlg( this );
    5. if ( Archives_dlg.exec() )
    6. {
    7. QString s = Archives_dlg->getFileName( const QmodelIndex & idx);
    8. }
    9. }
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    and the compiler says :
    QString s = Archives_dlg->getFileName( const QmodelIndex & idx);
    180 C:\Qt\test\sms\menu.cpp base operand of `->' has non-pointer type `Archives'

    in the procedure above I make a similar call with (apparently the same syntax) and it works, so I don't know.

  2. #2
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    Default Re: compile issue, syntax i guess, but can't find it

    Edit: errr.. use operator "." and you need to also pass a QModelIndex.

    Qt Code:
    1. QModelIndex idx = ....
    2. QString s = Archives_dlg.getFileName(idx);
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    Last edited by jpn; 29th March 2006 at 14:39.

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    incapacitant (29th March 2006)

  4. #3
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    Default Re: compile issue, syntax i guess, but can't find it

    same with '.' : 180 C:\Qt\test\sms\menu.cpp expected primary-expression before "const"

    my previous call is with "->"

  5. #4
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    Default Re: compile issue, syntax i guess, but can't find it

    QString s = Archives_dlg->getFileName(idx);
    180 C:\Qt\test\sms\menu.cpp base operand of `->' has non-pointer type `Archives'

    getFileName is a public function of class Archives.

    Just like another instance in the code where this time it is a public function of another class.
    I cannot see any difference in the way I do it.

  6. #5
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    Default Re: compile issue, syntax i guess, but can't find it

    In C++, you access class members with operator "->" from a pointer, and with operator "." from an object.

    You either:
    Qt Code:
    1. Archives Archives_dlg(this);
    2. Archives_dlg.blaa();
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    OR
    Qt Code:
    1. Archives* Archives_dlg = new Archives(this);
    2. Archives_dlg->blaa();
    To copy to clipboard, switch view to plain text mode 

    Notice the difference?

  7. The following user says thank you to jpn for this useful post:

    incapacitant (29th March 2006)

  8. #6
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    Default Re: compile issue, syntax i guess, but can't find it

    archiv.h
    Qt Code:
    1. public:
    2. Archives( QWidget *parent = 0 );
    3. ~Archives();
    4. QString getFileName( const QModelIndex &);
    To copy to clipboard, switch view to plain text mode 

    archiv.cpp
    Qt Code:
    1. //****************************************************************
    2. QString Archives::getFileName( const QModelIndex & idx )
    3. {
    4. return model->data(idx.sibling(idx.row(), 0)).toString();
    5. }
    To copy to clipboard, switch view to plain text mode 

    menu.cpp
    Qt Code:
    1. //****************************************************************
    2. void ApplicationWindow::archives()
    3. {
    4. Archives Archives_dlg( this );
    5. if ( Archives_dlg.exec() )
    6. {
    7. QString s = Archives_dlg.getFileName(idx);
    8. }
    9. }
    To copy to clipboard, switch view to plain text mode 


    compiler
    QString s = Archives_dlg.getFileName(idx);
    180 C:\Qt\test\sms\menu.cpp no matching function for call to `Archives::getFileName(QModelIndex*&)'

    It's is parameter type wrong somewhere. But I have a similar piece of code that works.
    I am lost.

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    Default Re: compile issue, syntax i guess, but can't find it

    Did you #include "archiv.h" in menu.cpp?

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    incapacitant (29th March 2006)

  11. #8
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    Default Re: compile issue, syntax i guess, but can't find it

    yes it is a new action in the same class that :
    Qt Code:
    1. QStringList ret = Destinataires_dlg->getDestList();
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    this compiles and works
    Qt Code:
    1. QString s = Archives_dlg->getFileName(idx);
    To copy to clipboard, switch view to plain text mode 
    this does not


    just a new routine based on a click on the view

  12. #9
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    Default Re: compile issue, syntax i guess, but can't find it

    when i remove the qmodelindex parameter from all sides (.h.cpp) it compiles, so it comes from the qmodelindex which is not passed correctly and as i said i don't understand.

  13. #10
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    Default Re: compile issue, syntax i guess, but can't find it

    menu.cpp
    Qt Code:
    1. //****************************************************************
    2. void ApplicationWindow::archives()
    3. {
    4. Archives Archives_dlg( this );
    5. if ( Archives_dlg.exec() )
    6. {
    7. QString s = Archives_dlg.getFileName(idx);
    8. }
    9. }
    To copy to clipboard, switch view to plain text mode 
    Where do you declare that idx-variable?

    Dunno if compilers even care about this, but you are also missing parameter name in archiv.h:
    QString getFileName( const QModelIndex & idx);

  14. The following user says thank you to jpn for this useful post:

    incapacitant (29th March 2006)

  15. #11
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    Default Re: compile issue, syntax i guess, but can't find it

    I declare it in the connect :
    Qt Code:
    1. connect( qArchiv, SIGNAL( clicked( const QModelIndex &) ),
    2. this, SLOT( selectmsg( const QModelIndex &) ) );
    To copy to clipboard, switch view to plain text mode 
    archiv.h
    Qt Code:
    1. #ifndef ARCHIVES_H
    2. #define ARCHIVES_H
    3.  
    4. #include <qdialog.h>
    5.  
    6. #include <QtCore>
    7. #include <QtGui>
    8.  
    9. class QTreeView;
    10.  
    11. class Archives : public QDialog
    12. {
    13. Q_OBJECT
    14.  
    15. public:
    16. Archives( QWidget *parent = 0 );
    17. ~Archives();
    18.  
    19. QString getFileName( const QModelIndex & );
    20.  
    21. protected slots:
    22. void selectmsg( const QModelIndex & );
    23.  
    24.  
    25. private:
    26. QTreeView *qArchiv;
    27. QPushButton *pbOk;
    28.  
    29. void addArchiv( QString sDate, QString sDest, QString sMsg );
    30. void remplirArchiv();
    31.  
    32. };
    33.  
    34. #endif
    To copy to clipboard, switch view to plain text mode 


    Qt Code:
    1. //****************************************************************
    2. void ApplicationWindow::archives()
    3. {
    4. Archives Archives_dlg( this );
    5. if ( Archives_dlg.exec() )
    6. {
    7. QStringList ret = Destinataires_dlg->getDestList();
    8. QString qS = Archives_dlg.getFileName(const QModelIndex idx); // 181
    9. }
    10. }
    To copy to clipboard, switch view to plain text mode 

    only the second line which uses QModelIndex fails:
    181 C:\Qt\test\sms\menu.cpp expected primary-expression before "const"

  16. #12
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    Default Re: compile issue, syntax i guess, but can't find it

    should i post a zip with all my files ?

  17. #13
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    Default Re: compile issue, syntax i guess, but can't find it

    So you want the return the selected item as a string?

    archiv.h:
    Qt Code:
    1. public:
    2. QString getFileName();
    To copy to clipboard, switch view to plain text mode 

    archiv.cpp:
    Qt Code:
    1. QString Archives::getFileName()
    2. {
    3. QModelIndex idx = qArchiv->selectionModel()->currentIndex();
    4. return model->data(idx.sibling(idx.row(), 0)).toString();
    5. }
    To copy to clipboard, switch view to plain text mode 

    menu.cpp:
    Qt Code:
    1. void ApplicationWindow::archives()
    2. {
    3. Archives Archives_dlg( this );
    4. if ( Archives_dlg.exec() )
    5. {
    6. QStringList ret = Destinataires_dlg->getDestList();
    7. QString qS = Archives_dlg.getFileName(); // 181
    8. }
    9. }
    To copy to clipboard, switch view to plain text mode 

  18. The following user says thank you to jpn for this useful post:

    incapacitant (29th March 2006)

  19. #14
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    Default Re: compile issue, syntax i guess, but can't find it

    Qt Code:
    1. QString qS = Archives_dlg.getFileName(const QModelIndex idx);
    To copy to clipboard, switch view to plain text mode 

    You shouldn't use any type names in the call. It should like this:

    Qt Code:
    1. QString qS = Archives_dlg.getFileName(idx);
    To copy to clipboard, switch view to plain text mode 

  20. #15
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    Default Re: compile issue, syntax i guess, but can't find it

    Qt Code:
    1. QString qS = Archives_dlg.getFileName();
    To copy to clipboard, switch view to plain text mode 

    compiler errors :
    181 C:\Qt\test\sms\menu.cpp no matching function for call to `Archives::getFileName()'
    note C:\Qt\test\sms\archiv.h:21 candidates are: QString Archives::getFileName(const QModelIndex&)
    from .h declaration i suppose

    I need this index it is the row that the user clicked on on the view. i cannot remove it everywhere.

  21. #16
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    Default Re: compile issue, syntax i guess, but can't find it

    Check carefully all the pieces of code I gave you (escpecially archiv.cpp).
    It asks the current index from the view and returns it's data, there is no need to keep track of clicked items.. And you didn't store that clicked item anywhere anyway (and neither should you store model indexes, you are advised to use QPersistentModelIndex if you really need to)..

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    incapacitant (29th March 2006)

  23. #17
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    Unhappy Re: compile issue, syntax i guess, but can't find it

    Thank you for your samples code, I did not see first about the IMPORTANT changes you had made. Now the slot is activated and I should be able to use it.

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