表示n字节对齐，比如n=1
typedef struct
{
short Type; //2字节
size_t Size; //4字节
short Reserved1; //2字节
short Reserved2; //2字节
size_t OffBits; //4字节
} BMP_FILE_HEADER;
结果： sizeof（BMP_FILE_HEADER）=16
#pragma pack（1）
typedef struct
{
short Type;
size_t Size;
short Reserved1;
short Reserved2;
size_t OffBits;
} BMP_FILE_HEADER;
pragma pack（）;
结果： sizeof（BMP_FILE_HEADER）=14
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