список окон QT

#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
#include <X11/Xlib.h>
#include <X11/XKBlib.h>
#include <X11/Xutil.h>

static Display * dpy;
static Window root;
char **name = NULL;
int param;
int main(int argc, char ** argv)
{
  dpy = XOpenDisplay (NULL);
  assert (dpy);
  root = DefaultRootWindow (dpy);
  assert (root);

  Window rw, pw, *cw;
  unsigned int nchildren, i;


  assert (XQueryTree (dpy, root, &rw, &pw, &cw, &nchildren));
  for (i = 0; i < nchildren; i++)
  {
        XFetchName(dpy,cw[i],name);
	//Xutf8TextPropertyToTextList(dpy,&text,&name,&param);
	printf("%s\n",name[i]);
  }

}

Syntax

Status XFetchName(display, w, window_name_return)
      Display *display;
      Window w;
      char **window_name_return;

Arguments
display 	Specifies the connection to the X server.
w 	Specifies the window.
window_name_return 	Returns the window name, which is a null-terminated string. 

char **name = NULL;
...
        XFetchName(dpy,cw[i],name);
	//Xutf8TextPropertyToTextList(dpy,&text,&name,&param);
	printf("%s\n",name[i]);