Ernst Kloppenburg <[EMAIL PROTECTED]> writes:
> >
> > When I call 'netscape-remote' directly, I get the following error
> > message: 'root window has no children on display :0'
> >
> > This can be verified with 'xwininfo -children -root' which gives a
> > very short output in this case. With fvwm running the output of the
> > command gives a lot of children windows.
In fact in kde-2.1 the root window is "overloaded" by a kde specific
root window (done by kdesktop). The solution is to use the following
tips (given to me by Martin Schenk) :
/******************************************************
XQueryTree to make netscape / xquote work with KDE
compile as a dynamic library and use LD_PRELOAD to
replace the original XQueryTree
*******************************************************/
#include <X11/X.h>
#include <X11/Xatom.h>
#include <X11/Xlib.h>
#include <dlfcn.h>
typedef Status (*XQT) (Display*, Window, Window*, Window*, Window**, unsigned
int *);
static Window vroot;
static XQT xqt=NULL;
static Screen *save_screen = (Screen *)0;
Status XQueryTree(dpy, w, root_return, parent_return,
children_return, nchildren_return)
Display *dpy;
Window w;
Window *root_return;
Window *parent_return;
Window **children_return;
unsigned int *nchildren_return;
{
Screen *scr=DefaultScreenOfDisplay(dpy);
Status s;
if (xqt==NULL) /* Initialize xqt */
{
xqt=dlsym(RTLD_NEXT, "XQueryTree");
if (!xqt) { printf("no XQueryTree ?\n"); exit(1); }
}
if (save_screen != scr) /* initialize vroot */
{
Atom __SWM_VROOT = None;
vroot=RootWindowOfScreen(scr);
__SWM_VROOT = XInternAtom(dpy, "__SWM_VROOT", False);
if (xqt(dpy, vroot, root_return, parent_return, children_return,
nchildren_return))
{
unsigned int i;
for (i = 0; i < *nchildren_return; i++) {
Atom actual_type;
int actual_format;
unsigned long nitems, bytesafter;
Window *newRoot = (Window *)0;
if (XGetWindowProperty(dpy,
(*children_return)[i],
__SWM_VROOT, 0, 1, False, XA_WINDOW,
&actual_type, &actual_format,
&nitems, &bytesafter,
(unsigned char **) &newRoot) == Success
&& newRoot) {
vroot = *newRoot;
break;
}
}
if (*children_return)
XFree((char *)*children_return);
}
save_screen=scr;
}
s=xqt(dpy,w,root_return,parent_return,children_return,
nchildren_return);
if ((w==vroot) && (! (*children_return && *nchildren_return)) &&
(vroot!=*root_return))
{ /* we want real root window */
s=xqt(dpy,*root_return,root_return,parent_return,
children_return, nchildren_return);
}
return s;
}
---------------------------------------------
To compile the code, the following should work:
gcc -fPIC -c -I/usr/X11R6/include xq.c
gcc -o xq.so -shared xq.o
To use it just set LD_PRELOAD to the path:
export LD_PRELOAD=/usr/local/lib/xq.so
If you just want to have netscape use it, put this "export LD_PRELOAD..."
in the shellscript that starts netscape (typically /usr/X11R6/bin/netscape
just is a script).
---------------------------------------------
Now I am using kde-2.2 beta, and the problem is solved. Note that this
tips can be used for any program that needs the root window.
HTH.
--
Julien Gilles.
