Hi,

According to this wiki page: http://wiki.freepascal.org/Gtk%2B3 I downloaded latest gtk3 headers from:
http://sourceforge.net/p/lazarus-ccr/svn/HEAD/tree/bindings/gtk3/

I have very simple Hello World application which is working fine on GTK2:

gtk_init(@argc, @argv);
windows := gtk_window_new(GTK_WINDOW_TOPLEVEL);
gtk_widget_show(window);
gtk_main();

but on GTK3 it crash on gtk_main(); (but I see main window for a few milliseconds).
I know that GTK3 is on development stage, but is anyone successful using it on this stage? Because last update of headers were over a year ago. There are also missing main functions like g_signal_connect() or functions for box layouts.

Linux Mint 14 64bit, XFCE edition
Free Pascal 2.6.2
Lazarus 1.0.8

Regards
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Look at implementation in lazarus/lcl/interfaces/gtk3 . It works , also most of wincontrols works (using bit modified bindings from lazarus/lcl/interfaces/gtk3/gtk3bindings

zeljko

Yes. I checked also source from interfaces. Same problem. Maybe I'm doing something wrong? My steps:
1. I copied headers from lazarus/lcl/interfaces/gtk3/gtk3binding into my project source because I'm not interested in LCL, I need to write pure Gtk3 application
2. I installed gtk3 dev headers in my ubuntu distro by: sudo aptitude install libgtk-3-dev. Other dependences were installed too, like: gir1.2-gtk-3.0{a} libatk-bridge2.0-dev{a} libgtk-3-dev libwayland-dev{a} libxkbcommon-dev{a}
3. Application is compiling fine, but crash in gtk_main() with error: "External: SIGFPE"
4. When I run program from console I see error text: "EDivByZero : Divizion by zero"

BTW: Have Lazarus Gtk3 support for windows too? I mean, I see only link to linux .so library, but Gtk3 has package for windows too where dll libs are used.
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Ok I give up. Could not find simple Gtk3 example in lazarus implementation. So I found another gtk hello world in C based on Gtk3 from: https://developer.gnome.org/gnome-devel-demos/3.6/checkbutton.c.html.en . But same error with division by zero:

var
  window: PGtkWidget;
  app: PGtkApplication;
  status: Integer;
  procedure activate; cdecl;
  begin
    window := gtk_application_window_new(app);
    gtk_window_set_title(PGtkWindow(window), 'CheckButton Example');
    gtk_window_set_default_size (PGtkWindow(window), 300, 100);
    gtk_widget_show_all(window);
  end;
begin
  g_type_init();
  app := gtk_application_new ('org.example.checkbutton',
G_APPLICATION_FLAGS_NONE);
  g_signal_connect_data(app, 'activate', @activate, nil, nil, 0);
  status := g_application_run (PGApplication(app), argc, argv);
  g_object_unref (app);
end.
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Have you tried to add (eg. to initialization) ?
SetExceptionMask([exDenormalized,exInvalidOp,exOverflow,exPrecision,exUnderflow,exZeroDivide]);

Totally forgot about SetExceptionMask! Remember that I needed to use it in fpGUI application too. I forgot about this because Gtk2 example is working fine. Thanks zeljko, now it is working! Great :D

2013/10/3 zeljko

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I am a bit late to answer but there are a few examples here:

http://sourceforge.net/p/lazarus-ccr/svn/HEAD/tree/bindings/gtk3/examples/

Regards,

Andrew Haines

Krzysztof wrote

There are also missing main functions like g_signal_connect() or functions for box layouts.

g_signal_connect is a c macro around g_signal_connect_data which is available. The bindings are generated using introspection, so everything works but some convenience macros aren't available.

Which function's for box layouts are missing? The generator does not include things which are marked deprecated in the introspection files so that could be the cause.

Regards,

Andrew

2013/10/6 Andrew Haines

For example gtk_vbox_new();
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Ah ok this is a deprecated class in Gtk 3. Now you should use gtk_box_new(<Orientation>);
GTK_ORIENTATION_HORIZONTAL
GTK_ORIENTATION_VERTICAL

Regards,

Andrew

Krzysztof wrote

For example gtk_vbox_new();

Do not use deprecated stuff in gtk3.
Gtk3 is still changing a lot and deprecated routines are removed from version to version.

z.