Re: GdkEventMask?

[Tristan Van Berkom <vantr touchtunes com>]

> rootwindow = gdk_window_foreign_new (gdk_x11_get_default_root_xwindow());

hmmm, this is in some kind of callback function ?

This is just an educated guess but here goes:

this:

    gdk_x11_get_default_root_xwindow()

will probably return an int (XID) reference to an X resource (which is 
an "x window" in
this case).

and this:

   gdk_window_foreign_new(XID *)

_will_ create a new GdkWindow.

a  "GdkEventMask" will apply to some flags in the newly created
"GdkWindow"; it will affect what events you have filtered out in
the "gdk" api; not the "xlib" api.

so; you want to create _one_ GdkWindow and only reference it
in your callbacks. (you probably had some memory leak also
from the continous creation of GdkWindow objects).


Hope this helps,
                                        -Tristan



Andreas Volz wrote:

>Hi,
>
>I use this in my gdk-app to show if a event is available for root
>window:
>
>GdkEventMask unavailable_events;
>GdkWindow *rootwindow;
>
>rootwindow = gdk_window_foreign_new (gdk_x11_get_default_root_xwindow());
>
>unavailable_events = gdk_window_get_events(rootwindow);
>
>if ((unavailable_events & GDK_BUTTON_PRESS_MASK) == GDK_BUTTON_PRESS_MASK)
>    {
>      printf ("GDK_BUTTON_PRESS_MASK not available for root window\n");
>      exit (1);
>    }
>  else
>    {
>      printf ("GDK_BUTTON_PRESS_MASK available for root window\n");
>      gdk_window_set_events (rootwindow, GDK_BUTTON_PRESS_MASK);
>    }
>
>I want to check it, because if not my app crashes with:
>The program 'grootevent' received an X Window System error.
>This probably reflects a bug in the program.
>The error was 'BadAccess (attempt to access private resource denied)'.
>  (Details: serial 44 error_code 10 request_code 2 minor_code 0)
>  (Note to programmers: normally, X errors are reported asynchronously;
>   that is, you will receive the error a while after causing it.
>   To debug your program, run it with the --sync command line
>   option to change this behavior. You can then get a meaningful
>   backtrace from your debugger if you break on the gdk_x_error() function.)
>
>But it doesn't work. I go everytime into the else-part. What did I wrong?
>
>Thanks
>Andreas
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