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Thread: Run Time error: Object::connect: No such slot dlgTextScroller::pbPreview_clicked(app)

  1. #1
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    Question Run Time error: Object::connect: No such slot dlgTextScroller::pbPreview_clicked(app)

    Dear ................!

    I have a need of QApplication app(int argc,char **argv) variable (which is declared in main.cpp) in pbPreview_clicked() slot.
    /*In dlgtextscroller.h I have defined the slot as follows*/
    private slots:
    virtual void pbPreview_clicked(QApplication *app);


    /*In dlgTextScroller constructor I connected the pbPreview clicked( ) push button signal to dlgTextscroller pbPreview_clicked(app) as follows*/

    dlgTextScroller::dlgTextScroller( QApplication *app, QWidget* parent)
    : QDialog(parent)
    {
    setupUi(this);
    connect( pbPreview, SIGNAL( clicked() ), this, SLOT( pbPreview_clicked(app) ));
    }

    void dlgTextScroller:bPreview_clicked(QApplication *app)
    {
    ...
    ...
    ...
    }

    It doesn't give any comile time error but when I ran, it gives the following error and show the dialog.........

    Object::connect: No such slot dlgTextScroller:bPreview_clicked(app)
    Object::connect: (sender name: 'pbPreview')
    Object::connect: (receiver name: 'dlgTextScroller')

    Thanks in advance........!
    Anurag Shukla
    A man who never makes mistake is the man who never does anything! Theodre Rosvelt!

  2. #2
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    Default Re: Run Time error: Object::connect: No such slot dlgTextScroller::pbPreview_clicked(

    The QApplication object is accessible through the QCoreApplication::instance() function which return a pointer equivalent to the global qApp pointer
    J-P Nurmi

  3. #3
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    Default Re: Run Time error: Object::connect: No such slot dlgTextScroller::pbPreview_clicked(

    Quote Originally Posted by ashukla View Post
    connect( pbPreview, SIGNAL( clicked() ), this, SLOT( pbPreview_clicked(app) ));
    You can't put values, variables and parameter names inside SLOT and SIGNAL macros.

    You can store that pointer in a member variable -- there's no point in passing it as a parameter to a method of the same class. Another solution is to use QCoreApplication::instance().

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