XPLMGetWindowGeometry
From X-Plane SDK
XPLMGetWindowGeometry
XPLM_API void XPLMGetWindowGeometry( XPLMWindowID inWindowID, int * outLeft, /* Can be NULL */ int * outTop, /* Can be NULL */ int * outRight, /* Can be NULL */ int * outBottom); /* Can be NULL */This routine returns the position and size of a window in cockpit pixels. Pass NULL to not receive any paramter.