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GetWindowLong()
Return a long (32-bit) value from a window structure
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Syntax
GetWindowLong( <hWnd>, <nPos> )   -->   nValue

Arguments
<hWnd> is a handle to a window.

<nPos> is the long whose value is wanted.  (Use one of the
GWL_* values defined in WINDOWS.CH.)

Returns
The value is returned as an integer.

Description
This function can be used to retrieve a long (32-bit value)
from the window structure that is maintained internally by
Windows.

Example
nStyle = GetWindowLong( hWnd, GWL_STYLE )
? "This window's style is: ", nStyle