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struct.pack():
struct.packÓÃÓÚ½«PythonµÄÖµ¸ù¾Ý¸ñʽ·û£¬×ª»»Îª×Ö·û´®£¨ÒòΪPythonÖÐûÓÐ×Ö½Ú(Byte)ÀàÐÍ£¬¿ÉÒÔ°ÑÕâÀïµÄ×Ö·û´®Àí½âΪ×Ö½ÚÁ÷£¬»ò×Ö½ÚÊý×飩¡£Æäº¯ÊýÔÐÍΪ£ºstruct.pack(fmt, v1, v2, ...)
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>>> import struct
>>> a=20
>>> b=400
>>> str=struct.pack('ii',a,b)
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>>> print len(str)
#ii ±íʾÁ½¸öint
8
#¿ÉÒÔ¿´µ½³¤¶ÈΪ8¸ö×Ö½Ú£¬ÕýºÃÊÇÁ½¸öintÐÍÊý¾ÝµÄ³¤¶È
>>> print str
#¶þ½øÖÆÊÇÂÒÂë
>>> print repr(str)
'\x14\x00\x00\x00\x90\x01\x00\x00'
#ÆäÖÐÊ®Áù½øÖÆµÄ 0x00000014, 0x00000190·Ö±ð±íʾ20ºÍ400
>>>
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format = "!HH%ds" % len(data)
buffer = struct.pack(format,opcode,blocknumber,data)
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struct.unpack():
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>>> a1,a2=struct.unpack('ii',str)
>>> print 'a1',a1
a1 20
>>> print 'a2=',a2
a2= 400
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struct.calcsize():ÓÃÀ´¼ÆËãÌØ¶¨¸ñʽµÄÊä³öµÄ´óС£¬ÊǼ¸¸ö×Ö½Ú£¬±ÈÈ磺
>>> struct.calcsize('HH4s')
8
>>> struct.calcsize('ii')
8
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