Re: Pointer and signals

["Paul Davis" <pjdavis engineering uiowa edu>]

On 4/2/07, schmirrwurst free fr <schmirrwurst free fr> wrote:
> Hi,
>
> I have following question, I usually create an object like this :
> button_filechooser = manage( new Gtk::Button(Gtk::Stock::OPEN));
>
> but then I get an error on connecting a handler (that it is of non-class
> gtk::button)
>
> button_filechooser.signal_clicked().connect( sigc::mem_fun( *this,
> &Dialog_Make_Image::on_button_filechooser_clicked) );
>
> I've tried the same with initialising the object like this :
> Gtk:Button button_filechooser(Gtk::Stock::OPEN)
> Then it works !
>
> So I guessed it is an issue with pointers, and I tried with a pointer
> again with :
> *button_filechooser.signal_clicked().connect( sigc::mem_fun( *this,
> &Dialog_Make_Image::on_button_filechooser_clicked) );
>
> Doesn't work !? Why ?
> How can I work with a pointer, and succed connecting a handler ?
>
>
>
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You're not dereferencing your pointer correctly.

This would be the usual method:
Gtk::Button* b = Gtk::manage( new Gtk::Button( "Text" ) ) ;
b->signal_clicked().connect( sigc::mem_fun( *this, &Foo::bar ) ) ;

Paul Davis