Re: Determining widget type

Hi Phil,

On 28/3/20 9:34, Phil Wolff <[email protected]> wrote:
> I want to modify the primary message widget so I can select and copy the
> text.
>
>   ??? Gtk::Box* pBox = pDialog->get_content_area ();
>   ??? std::vector<Gtk::Widget* > v = pBox->get_children ();
>   ??? Glib::ustring str = ((Gtk::Label*)v[0])->get_label ();
>
> This fails: Gtk-CRITICAL: 08:51:12.080: gtk_label_get_label: assertion
> 'GTK_IS_LABEL (label)' failed
>
> So the primary message widget isn't a Gtk::Label. How do I determine
> what it is?

Dynamic cast should do the job:

https://en.wikibooks.org/wiki/C%2B%2B_Programming/Programming_Languages/C%2B%2B/Code/Keywords/dynamic_cast

You can also use the *typeinfo* library as follows:

#include <typeinfo>

std::unique_ptr<Foo> foo( new Foo() );
std::string str = typeid(foo).name();
std::cout << str << std::endl;

Even though you should filter the outputs of special characters like :: 
<> and so.
In this concrete case, the program will throw a bizarre output like this:

St10unique_ptrI4FooSt14default_deleteIS0_EE

On the other hand, if you have access to the *boost* library, you'll be 
able to get a pretty name. Read here at the end of the post:

https://stackoverflow.com/questions/351845/finding-the-type-of-an-object-in-c

But i recommend you to pay attention to the dependencies of your project.

Hope this helps,

Aitor.

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