import clr
import clrtype
import System
from System.Reflection import BindingFlags

class Win32(object):
    __metaclass__ = clrtype.ClrClass

    from System.Runtime.InteropServices import DllImportAttribute
    DllImport = clrtype.attribute(DllImportAttribute)
    
    @staticmethod
    @DllImport("user32.dll")
    @clrtype.accepts(System.IntPtr, System.String, System.String, System.UInt32)
    @clrtype.returns(System.Int32)
    def MessageBox(hwnd, text, caption, type): raise RuntimeError("Runtime Error")

Win32.MessageBox(System.IntPtr.Zero, "Hello, Win32 API(IronPython) World!", "Hello, World!", 0)