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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