学步园

struct定义：

#include "stdafx.h"
//内存对齐1字节
#pragma pack(1)

struct Day
{
	int DateTime;
	int Open;
	int High;
	int Low;
	int Close;
};

#pragma pack()

指针读取：

// Test.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"
#include "Day.cpp"
#include <sys\stat.h>
using namespace std;

int _tmain(int argc, _TCHAR* argv[])
{
	fstream f;
	const char* filename = "e:\\t.dat";
	f.open(filename,ios::binary|ios::in);

	struct _stat info;
	_stat(filename,&info);
	int filesize = info.st_size;
	const int SIZE_OF_DAY = sizeof(Day);
	cout<<"sizeof(Day)="<<SIZE_OF_DAY<<endl;
	const int days_count = filesize/sizeof(Day);
	cout<<"day_count="<<days_count<<endl;
	Day* day = new Day[days_count];
	//Day* dayTemp=day;
	for(int i=0;i<days_count;i++)
	{
		Day* p2Day = day + i;
		f.read((char*)p2Day,SIZE_OF_DAY);
		cout<<p2Day->DateTime<<endl;
		cout<<p2Day->Close<<endl;
	}
	f.close();
	delete[] day;
	system("pause");

	return 0;
}