修改书的信息.cpp

图书馆管理系统 查找

#include "stdafx.h"
#include"harRange.h"
#include"BookData.h"
void BookInfo(BookData &obj);
void changeISBN(fstream &file,BookData &obj)
{
	
	char isbn[14];
	cout<<"\t\t\t请输入新的isbn号:";
	cin.getline(isbn,14);
	obj.setISBN (isbn);

}

void changeTitle(fstream &file,BookData &obj)
{
	char title[51];
	cout<<"\t\t\t请输入新的书名:";
	cin.getline(title,51);
	obj.setTitle (title);
}

void changeAuthor(fstream &file,BookData &obj)
{
	char author[31];
	cout<<"\t\t\t请输入新的作者:";
	cin.getline(author,31);
	obj.setAuthor (author);
}

void changePub(fstream &file,BookData &obj)
{
	char publisher[31];
	cout<<"\t\t\t请输入新的出版社:";
	cin.getline(publisher,31);
	obj.setPub (publisher);
}

void changeDateAdded(fstream &file,BookData &obj)
{
	char dateAdded[11];
	cout<<"\t\t\t请输入新的进书日期:";
	cin.getline(dateAdded,11);
	obj.setDateAdded (dateAdded);
}

void changeWholesale(fstream &file,BookData &obj)
{
	float wholesale;
	cout<<"\t\t\t请输入新的批发价:";
	cin>>wholesale;
	obj.setWholesale (wholesale);
}

void changeQty(fstream &file,BookData &obj)
{
	int qty;
	cout<<"\t\t\t请输入新的库存量:";
	cin>>qty;
	obj.setQty (qty);
}

void changeRetail(fstream &file,BookData &obj)
{
	float retail;
	cout<<"\t\t\t请输入新的零售价:";
	cin>>retail;
	obj.setRetail (retail);
}
void editBook()
{
	BookData obj;
	int a;           //用来记录指针位置
	char ch;
	string bookname,name; //name用来将文件里的bookTitle转换成string类型
	fstream file;

	file.open("shendan.dat",ios::out|ios::in|ios::binary);
	if(file.fail())
	{
		cout<<"\t\t\t打开文件失败!";
		exit(0);
	}

	cout<<"\t\t\t请输入您要修改的书的书名:";
	cin>>bookname;	
	file.seekg(0,ios::beg);
	a = file.tellg();
	file.read((char *)&obj,sizeof(obj));
	name.assign (obj.getTitle() );
	while(bookname !=name && !file.eof())
	{
		a = file.tellg();
		file.read((char *)&obj,sizeof(obj));
		name.assign (obj.getTitle());
	}
	if(bookname!=name)
	{
		cout<<"\t\t\t本书库没有该书!\n";
	}
	else
	{
		BookInfo(obj);
	

		do
		{	
			cout<<"\t\t\t-------------------------------\n";
			cout<<"\t\t\t1.ISBN号"<<endl;
			cout<<"\t\t\t2.书名"<<endl;
			cout<<"\t\t\t3.作者"<<endl;
			cout<<"\t\t\t4.出版社"<<endl;
			cout<<"\t\t\t5.进书日期"<<endl;
			cout<<"\t\t\t6.库存量"<<endl;
			cout<<"\t\t\t7.批发价"<<endl;
			cout<<"\t\t\t8.零售价"<<endl;
			cout<<"\t\t\t请输入您要修改的项目:";
			harRange obj1(1,8,"请输入1-8之间的数字!\n");//出错检验

			switch(obj1.getChar())
			{
			case 1:changeISBN(file,obj);break;
			case 2:changeTitle(file,obj);break;
			case 3:changeAuthor(file,obj);break;
			case 4:changePub(file,obj);break;
			case 5:changeDateAdded(file,obj);break;
			case 6:changeQty(file,obj);break;
			case 7:changeWholesale(file,obj);break;
			case 8:changeRetail(file,obj);break;
			
			}
			
			cout<<"\t\t\t还要修改其它数据项吗(是:y,否:n)?";
			cin>>ch;

		}while(ch=='y');
	}
	file.seekg(a,ios::beg);
	file.seekp(a,ios::beg);
	file.write((char *)&obj,sizeof(obj));
	file.close();
}