C# Signature:

[DllImport("user32.dll")]
static extern int GetWindowRgn(IntPtr hWnd, IntPtr hRgn);

//Region Flags - The return value specifies the type of the region that the function obtains. It can be one of the following values.
const int ERROR           = 0;
const int NULLREGION      = 1;
const int SIMPLEREGION    = 2;
const int COMPLEXREGION   = 3;

VB.NET Signature:

<DllImport("user32.dll")> _
Private Shared Function GetWindowRgn(ByVal hWnd As IntPtr, ByVal hRgn As IntPtr) As Integer
End Function

User-Defined Types:

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Notes:

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