XGetInputFocus() does not work for GTK based applications

[Kala B <kalabalun yahoo co in>]

Hi,
The following code does not give me the correct window id for GTK based applications.
 
#include <X11/Xlib.h>
#include <unistd.h>
#include <assert.h>
main()
{
    Window focus = 0;
    int revet = 0;
    Display *disp = XOpenDisplay(0);
    assert(disp);
    sleep(2);
    XGetInputFocus(disp,&focus,&revert);
    printf("Win id is %x\n",focus);
 
}
It always prints a wrong window id for GTK based applications. (gaim, evolution) 
Do I need to set some environment variable? 
I am using xlsclients and xprop to verify the values being printed.
Could somebody please help me?
Is there a GTK API which with the same functionality of XGetInputFocus()? I basically want to get the window 
id of the window in focus. 
 
Thanks in advance
Kala


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