GTK+ Forums

Zarg · Familiar Face Joined: 09 Mar 2008 Posts: 10

Hello everybody!

Could anyone please tell me how I can get the GDK_WINDOW of my GTK_WINDOW?

Thanks a lot for helping me :)

Greetings
Zarg

Micah Carrick · Posted: Mon Mar 24, 2008 1:32 pm Post subject:

Code: (C)
1 2	GtkWindow my_window; GdkWindow = my_gdk_window = my_window->window;

Zarg · Familiar Face Joined: 09 Mar 2008 Posts: 10

Hello and thank you for this answer!

Unfortunately this doesn't seem to work for me ...

My very simple program compiles, but I get runtime errors:
- g_return_if_fail will abort my program because it fails "CRITICAL **: main: assertion `GDK_IS_WINDOW (gdk_window)' failed"
- if I remove g_return_if_fail (line 17) I get "Segmentation fault (core dumped)"

Code: (C)

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30

int main (int argc, char *argv[])
{
/* This is called in all GTK applications */
gtk_init (&argc, &argv);

/* window creation --------------------------------------------------- */
/* create a new toplevel window */
GtkWidget *xero;
xero = gtk_window_new (GTK_WINDOW_TOPLEVEL);

/* TODO get xdisplay and xwindow --------------------------------- */
Display *display;
Window window;

GdkWindow *gdk_window = xero->window;

g_return_if_fail (GDK_IS_WINDOW (gdk_window));

display = GDK_WINDOW_XDISPLAY (gdk_window);
window = GDK_WINDOW_XWINDOW (gdk_window);

/* Finish ---------------------------------------------------------------- */
/* Display the window */
gtk_widget_show (xero);

/* All GTK applications must have a gtk_main() */
gtk_main ();

return 0;
}

Any suggestions?
Or is there an easier way to do this?

Greetings
Zarg

Micah Carrick · Posted: Mon Mar 24, 2008 6:13 pm Post subject:

The window does not yet have a GdkWindow. You have to show it and wait for it to be created. For example...

Code: (C)

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30

#include <gtk/gtk.h>

int main (int argc, char *argv[])
{
GtkWidget *xero;

/* This is called in all GTK applications */
gtk_init (&argc, &argv);

/* window creation --------------------------------------------------- */
/* create a new toplevel window */

xero = gtk_window_new (GTK_WINDOW_TOPLEVEL);

/* Finish ---------------------------------------------------------------- */
/* Display the window */
gtk_widget_show (xero);

/* TODO get xdisplay and xwindow --------------------------------- */

while (gtk_events_pending()) gtk_main_iteration();
g_return_val_if_fail (GDK_IS_WINDOW (xero->window), 1);

/* All GTK applications must have a gtk_main() */
gtk_main ();

return 0;
}

Zarg · Familiar Face Joined: 09 Mar 2008 Posts: 10

Sometimes the solution is just too obvious :D

Thank you for solving this Problem!