Đọc-ghi files struct vào files trong C++ dùng hàm fstream

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fix2.PNG983x517 21.2 KB

Đây là source của mình

#include <iostream>
#include <fstream>
#include <cstring>
/* run this program using the console pauser or add your own getch, system("pause") or input loop */
#define MAX 100

using namespace std;

struct Test{
	string item;
	int quantity;
	double cost;
};

void Nhap(Test &);
void NhapDanhSach(Test [], int *);

void Xuat (Test );
void XuatDanhSach (Test [], int );

void Write (Test [], int );
void Read (Test [], int &);

void Nhap (Test &x)
{
	cout << "Nhap item: ";
	getline (cin, x.item);
	cout << "Nhap quatity: ";
	cin >> x.quantity;
	cout << "Nhap cost: ";
	cin >> x.cost;
	
	//Write(x);
	
	cin.ignore();
}
void NhapDanhSach(Test a[], int *n)
{
	cout << "Nhap n: ";
	cin >> *n;
	cin.ignore();
	
	for (int i=0; i<(*n); i++)
	{
		cout << "---- Test " << i << "----" << endl;
		Nhap (a[i]);
		cout << endl;
	}
}

void Xuat (Test a)
{
	cout << a.item << " | " << a.quantity << " | " << a.cost << endl;
	
}
void XuatDanhSach (Test a[], int n)
{
	cout << "===== In danh sach =====" << endl;
	
	for (int i=0; i<n; i++)
		Xuat (a[i]);
	
	cout << endl;
}

void Write (Test x[], int n)
{
	ofstream ghi ("Test_5", ios::out |ios::app | ios::binary);
	
	if (!ghi){
		cout << "Cannot open file." << endl;
		return ;
	}
	for (int i=0; i<n; i++)
		ghi.write((const char *) &x[i], sizeof(Test));
	ghi.close();
	
	if (!ghi.good())
	{
		cout << "A file error occurred" << endl;
		return ;
	}
}
void Read (Test a[], int &n)
{
	ifstream doc ("Test_5", ios::in | ios::binary);
	
	if (!doc){
		cout << "Cannot open file" << endl;
		return ;
	}
	
	while (!doc.eof())
	{
		doc.read((char *) &a[n], sizeof(Test));
		n++;
	}
	
	doc.close();
	
	if (!doc.good())
	{
		cout << "A file error occurred" << endl;
		return ;
	}
}



int main(int argc, char** argv) {
	
	/*
	ofstream fout ("InvDat", ios::out | ios::binary);
	
	if (!fout)
	{
		cout << "Cannot open file.
" << endl;
		return 1;
	}
	*/
	
	Test a[MAX];
	int n=0;
	
	NhapDanhSach(a, &n);
	//Write(a, n);
	XuatDanhSach (a, n);
	/*
	for (int i=0; i<n; i++)
		fout.write((const char *) &a[i], sizeof(Test));
	
	fout.close();
	
	if (!fout.good())
	{
		cout << "A file error occurred." << endl;
		return 1;
	}
	*/
	/*
	ifstream fin ("InvDat", ios::in | ios::binary);
	
	if (!fin){
		cout << "Cannot open file.
" << endl;
		return 1;
	}
	*/
	Test b[MAX];
	int m=0;
	
	Read(b, m);
	XuatDanhSach(b, m);
	/*
	for (int i=0; i<n; i++)
		fin.read((char *) &b[i], sizeof(Test));
	
	fin.close();
	
	if (!fin.good()){
		cout << "A file error occurred." << endl;
		return 1;
	}
	
	for (int i=0; i<n; i++)
		Xuat(b[i]);
	*/
	return 0;
}

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