#pragma pack(1) and #pragma pack(push,

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#pragma pack(1) and #pragma pack(push,
#pragma pack(1) and #pragma pack(push,

#pragma pack(1) and #pragma pack(push,
作用：调整结构体的边界对齐,让其以一个字节对齐；
#pragma pack(1) 使结构体按1字节方式对齐例如：struct sample{char a;double b;};若不用#pragma pack(1)和#pragma pack()括起来,则sample按编译器默认方式对齐（成员中size最大的那个）.即按8字节（double）对齐,则sizeof(sample)==16.成员char a占了8个字节（其中7个是空字节）
若用#pragma pack(1),则sample按1字节方式对齐sizeof(sample)＝＝9.（无空字节）
比较节省空间啦,有些场和还可使结构体更易于控制
(2) #pragma pack(push,1)
这是给编译器用的参数设置,有关结构体字节对齐方式的设置大概是指把原来对齐方式设置压栈,并设新的设置为1

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