對(duì)齊很重要，對(duì)結(jié)構(gòu)體，一定要對(duì)齊，尤其是涉及到文件/內(nèi)存雙向轉(zhuǎn)換的
#pragma pack(push,1)
struct RateInfoOld
{
time_t ctm; // rate time
int open; // open price: 11987=119.87
short high,low,close; // high,low,close shift from open
double vol; // volume
};
#pragma pack(pop)