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This function indicates if a window is a descendant of another window.

Syntax: ischild = spIsChild ( hwnd , hwndParent )


  • hwnd – Window handle of child window.
  • hwndParent – Window handle of parent window.


  • True (1) – if child window is a descendant of the parent window, or is equal to it.
  • False (0) – if child window is not a descendant of the parent, or is an Object Window (even if hwndParent is specified as the desktop or HWND_DESKTOP), or an error occurred.)