GetWindowWord function (winuser.h)

Retrieves the 16-bit (DWORD) value at the specified offset into the extra window memory.

Syntax

WORD GetWindowWord(
  HWND hWnd,
  int  nIndex
);

Parameters

hWnd

A handle to the window and, indirectly, the class to which the window belongs.

nIndex

The zero-based offset to the value to be retrieved. Valid values are in the range zero through the number of bytes of extra window memory, minus four; for example, if you specified 12 or more bytes of extra memory, a value of 8 would be an index to the third 32-bit integer. To retrieve any other value, specify one of the following values.

Constant	Value	Meaning
GWW_HINSTANCE	-6	Retrieves a handle to the application instance.
GWW_HWNDPARENT -8	Retrieves a handle to the parent window, if any.
GWW_ID	-12	Retrieves the identifier of the window.

Return value

If the function succeeds, the return value is the requested value.

If the function fails, the return value is zero. To get extended error information, call GetLastError.

Remarks

Reserve extra window memory by specifying a nonzero value in the cbWndExtra member of the WNDCLASSEX structure used with the RegisterClassEx function.

Requirements

Requirement	Value
Header	winuser.h