RealGetWindowClass

C# Signature:

[DllImport("user32.dll")]
static extern uint RealGetWindowClass(IntPtr hwnd, [Out] StringBuilder pszType,
   uint cchType);

VB Signature:

<DllImport("user32.dll", SetLastError:=True)> _
Private Shared Function RealGetWindowClass(ByVal hWnd As IntPtr, _
                        ByVal lpString As StringBuilder, _
                        ByVal nMaxCount As Integer) As Integer
End Function

Sample Code:

public static string RealGetWindowClassM(IntPtr hWnd)
{
    StringBuilder pszType = new StringBuilder();
    pszType.Capacity = 255;
    RealGetWindowClass(hWnd, pszType, (UInt32)pszType.Capacity);
    return pszType.ToString();
}