Re: How to use Pango::Context?

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does the error occur if you do windows.reserve(2) before the
emplace_back()s?


On Mon, 21 Feb 2022, 14:30 phosit--- via gtkmm-list, <[email protected]>
wrote:

> Hello
> I try to list the awailable font-families.
> If I open and close multiple windows ther is a critical error:
> GLib-GObject-CRITICAL **: 15:22:32.722: g_object_unref: assertion
> 'G_IS_OBJECT (object)' failed
>
> This is the code, the error ocours even without the uncomented code:
>
> #include <gtkmm/application.h>
> #includs thee <gtkmm/window.h>
> #include <gtkmm/textview.h>
>
> class Window: public Gtk::Window
> {
> public:
>         Window()
>         {
>                 this->show();
>                 this->set_child(this->text);
>
>                 auto context = this->text.create_pango_context();
>                 auto fontMap = context->get_font_map();
> //              auto fontList = fontMap->list_families();
> //              auto buffer = this->text.get_buffer();
> //              auto iter = buffer->get_iter_at_offset(0);
> //              for(const auto& fam : fontList)
> //              {
> //                      iter = buffer->insert(iter,
> //                              fam->get_name() + '\n');
> //              }
> //      }
>
> private:
>         Gtk::TextView text;
> };
>
> auto main() -> int
> {
>         std::vector<Window> windows;
>         auto app = Gtk::Application::create();
>
>         app->signal_activate().connect([&]
>         {
>                 auto& w0 = windows.emplace_back();
>                 app->add_window(w0);
>                 auto& w1 = windows.emplace_back();
>                 app->add_window(w1);
>         });
>
>         return app->run();
> }
> _______________________________________________
> gtkmm-list mailing list
> [email protected]
> https://mail.gnome.org/mailman/listinfo/gtkmm-list
>

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<div dir=3D"auto"><div>does the error occur if you do windows.reserve(2) be=
fore the emplace_back()s?</div><div dir=3D"auto"><br><br><div class=3D"gmai=
l_quote" dir=3D"auto"><div dir=3D"ltr" class=3D"gmail_attr">On Mon, 21 Feb =
2022, 14:30 phosit--- via gtkmm-list, &lt;<a href=3D"mailto:gtkmm-list@gnom=
e.org">[email protected]</a>&gt; wrote:<br></div><blockquote class=3D"gm=
ail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-le=
ft:1ex">Hello<br>
I try to list the awailable font-families.<br>
If I open and close multiple windows ther is a critical error:<br>
GLib-GObject-CRITICAL **: 15:22:32.722: g_object_unref: assertion<br>
&#39;G_IS_OBJECT (object)&#39; failed<br>
<br>
This is the code, the error ocours even without the uncomented code:<br>
<br>
#include &lt;gtkmm/application.h&gt;<br>
#includs thee &lt;gtkmm/window.h&gt;<br>
#include &lt;gtkmm/textview.h&gt;<br>
<br>
class Window: public Gtk::Window<br>
{<br>
public:<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 Window()<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 {<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 this-&gt;show();<br=
>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 this-&gt;set_child(=
this-&gt;text);<br>
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 auto context =3D th=
is-&gt;text.create_pango_context();<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 auto fontMap =3D co=
ntext-&gt;get_font_map();<br>
//=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 auto fontList =3D fontMa=
p-&gt;list_families();<br>
//=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 auto buffer =3D this-&gt=
;text.get_buffer();<br>
//=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 auto iter =3D buffer-&gt=
;get_iter_at_offset(0);<br>
//=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 for(const auto&amp; fam =
: fontList)<br>
//=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 {<br>
//=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 iter =3D buffer-&gt;insert(iter,<br>
//=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 fam-&gt;get_name() + &#39;\n&#39;);<br>
//=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 }<br>
//=C2=A0 =C2=A0 =C2=A0 }<br>
<br>
private:<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 Gtk::TextView text;<br>
};<br>
<br>
auto main() -&gt; int<br>
{<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 std::vector&lt;Window&gt; windows;<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 auto app =3D Gtk::Application::create();<br>
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 app-&gt;signal_activate().connect([&amp;]<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 {<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 auto&amp; w0 =3D wi=
ndows.emplace_back();<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 app-&gt;add_window(=
w0);<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 auto&amp; w1 =3D wi=
ndows.emplace_back();<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 app-&gt;add_window(=
w1);<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 });<br>
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 return app-&gt;run();<br>
}<br>
_______________________________________________<br>
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">[email protected]</a><br>
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errer noreferrer" target=3D"_blank">https://mail.gnome.org/mailman/listinfo=
/gtkmm-list</a><br>
</blockquote></div></div></div>

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