window configuration events

[Steven J Abner]

  In creating an event loop, I'm trying to avoid having inaccurate 
data. I found that window managers are apparently sending the events 
and not the Xserver. I would like to have the actual position of a 
window for data passed along to others.
  Unfortunately the xcb_configure_notify_event_t sent by window mangers 
is a guess, at least on 2 that I've tried. Fortunately the width, 
height have tested the same, so can use to configure drawing ports.
  Sadly I am too much of a newbie and can't figure how to get the 
geometry of a window's x,y position. Here's the code in my attempt:

  xcb_configure_notify_event_t *configure;
  configure = (xcb_configure_notify_event_t*)nvt;
  int16_t hD = configure->width - iface->mete_box.w;
  int16_t vD = configure->height - iface->mete_box.h;
  if ((hD != 0) || (vD != 0))
    _interface_configure(iface, hD, vD);
  if ((configure->x | configure->y) != 0) {
    xcb_get_geometry_cookie_t cookie;
    cookie = xcb_get_geometry(connection, iface->window);
    xcb_get_geometry_reply_t *cfg;
    cfg = xcb_get_geometry_reply(connection, cookie, NULL);
    if ((cfg->x != configure->x) || (cfg->y != configure->y)) {
      printf("%d, { %d,%d } cfg { %d,%d }\n",
             iface->window,
             configure->x, configure->y, cfg->x, cfg->y);
    }
    free(cfg);

    master_iface->mete_box.x = configure->x;
    master_iface->mete_box.y = configure->y;
  }

I get a result of this on one manger, that actually provides the 
correct x,y on configure events:

window 71303168, CONFIGURE_NOTIFY. (101,223,800,200)
71303168, { 101,223 } cfg { 0,0 }

Can you please help me get the window's position from xcb. I'm not at a 
point to learn Xlib's XGetWindowAttributes() nor desire to write off my 
ignorance on xcb's API.

Steve