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pack unpack的使用
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lua中pack(formar,args+) 函数的format: Letter Codes
- z : zero-terminated string
- p : string preceded by length byte
- P : string preceded by length word
- a : string preceded by length size_t
- A : string
- f : float ==》4
- d : double ==》8
- n : Lua number
- c : char ==》1
- b : byte (unsigned char)
- h : short
- H : unsigned short ==》2
- i : int ==》2
- I : unsigned int ==》2
- l : long ==》4
- L : unsigned long ==》4
- < : little endian
- > : big endian
- = : native endian
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