C# Signature:

[DllImport("user32.dll", SetLastError=true)]
static extern int GetWindowLong(HandleRef hWnd, int nIndex);

VB Signature:

<DllImport("user32.dll", SetLastError:=True)> _
Private Shared Function GetWindowLong(ByVal hWnd As HandleRef, _
                       ByVal nIndex As Integer) As Integer
End Function

Constants:

GWL_ID = (-12)
GWL_STYLE = (-16)
GWL_EXSTYLE = (-20)

Notes:

This function is NOT 64-bit safe when retrieving handle or pointer values. Use GetWindowLongPtr instead when retrieving an IntPtr.

Tips & Tricks:

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Sample Code:

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Alternative Managed API:

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