#!/usr/bin/python
# -*- coding: GBK -*-
#-------------------------------------------------------------------------------
#
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#

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from ctypes import (Structure, c_ubyte, memmove, string_at, sizeof, addressof)


class  tagHead(Structure):
    _pack_ = 1
    _fields_ = [
                  ("Cmd", c_ubyte),    
                  ("SubCmd", c_ubyte),    
                  ]

    def __init__(self):
        self.Clear()
        return

    def ReadData(self, stringData, _pos=0, _len=0):
        self.Clear()
        memmove(addressof(self), stringData[_pos:], self.GetLength())
        return _pos + self.GetLength()

    def Clear(self):
        self.Cmd = 0
        self.SubCmd = 0
        return

    def GetLength(self):
        return sizeof(tagHead)

    def GetBuffer(self):
        return string_at(addressof(self), self.GetLength())

    def OutputString(self):
        DumpString = '''
                                Cmd:%d,
                                SubCmd:%d
                                '''\
                                %(
                                self.Cmd,
                                self.SubCmd
                                )
        return DumpString