Re: [gtkmm] GTKMM classes handling local variables

[Benoît Touron <B Touron citb bull net>]

Ian,

Your _label gets destroyed when you leave the constructor
(MyClass::MyClass), because it's local.
That's probably why it is not desplayed.

You could either declare it in the class, or allocate it with new and 
use Gtk::Manage on the pointer:

This code should work:

MyClass::MyClass()
{
	Label *_label = Gtk::Manage( new Label("Hello World"));
	m_box.pack_start(*_label, PACK_SHRINK);
	show_all_children();
}


Ben

> Hi all, 
>
> Maybe someone can help me with this, I have only been developing with
> GTKMM for a little while so I am a little bit of a newbie.
>
> Right here is a piece of example code:
>
> class MyClass : public Gtk::Window
> {
> 	public:
> 		MyClass();
> 		virtual ~MyClass();
> 	private:
> 		VBox m_box;
> };
>
> MyClass::MyClass()
> {
> 	Label _label("Hello World");
> 	m_box.pack_start(_label, PACK_SHRINK);
> 	show_all_children);
> }
>
> MyClass::~MyClass()
> {
> }
>
> Right what I cannot understand is why this program will compile but my
> label will not be displayed? For some reason it will only work if I
> declare my Label in the class definition... I don't see why it is not
> working... :(
>
> Ian
>
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