load_save_user.cpp

C语言的课程设计。图书管理系统。有一些系统功能不怎么完善

#include"acridine.h"
#include"stdlib.h"
#include"string.h"
#include"iostream.h"
void save(user *yonghu)//把从实参传过来的结点信息写进文件
{
	FILE *fp1;
	if((fp1=fopen("acridine_massage.txt","a+"))==NULL)
	{
		printf("cannot open file\n");
		return;
	}
	fprintf(fp1,"%ld %s %s %s %s %s %d\n",yonghu->UserID,yonghu->true_name,yonghu->user_name,yonghu->sex,yonghu->phone,yonghu->code,yonghu->borrow_num);
	fclose(fp1);
}
int writeintobook(member &yonghu)//把从实参传过来的yonghu链表（yonghu为头结点）的信息写进文件，归删除函数调用
{
	user *p;
	FILE *fp;
	if((fp=fopen("acridine_massage.txt","w"))==NULL)
	{
		printf("cannot open file\n");
		exit(0);
	}
	p=yonghu;
	while(p!=NULL)
	{
		fprintf(fp,"%ld %s %s %s %s %s %d\n",p->UserID,p->true_name,p->user_name,p->sex,p->phone,p->code,p->borrow_num);
		p=p->next;
	}
	fclose(fp);
	return 1;
}
/*int load_acridine_massage(member &head)//将文件中的会员信息读取到链表中
{
	acridine *p1,*p2;
	FILE *fp;
	p1=head;
    while(p1!=NULL)
	{
	    p2=p1->next;	
		free(p1);
		p1=p2;
	}
	if((fp=fopen("acridine_massage.txt","r+"))==NULL)
	{
		printf("找不到该文件\n");
		return 0;
	}
	p1=(member)malloc(sizeof(acridine));
	p1->next=NULL;
	while(fread(p1,sizeof(user),1,fp))
	{
		p2=(member)malloc(sizeof(acridine));
		p2->next=NULL;
		p1->next=p2;
		p1=p2;
	}
	fclose(fp);
	return 1;
}*/
void read_to_link(member &yonghu)//形参为user类型的结点，user为结构体指针类型
{
	user *p1,*p2;
	FILE *fp;	
	if((fp=fopen("acridine_massage.txt","r+"))==NULL)
	{
		printf("　　　　　cannot open file\n");
		return ;
	}
	int i=0;
	while(!feof(fp))//把文件里的所有信息读进链表
	{
		p1=(user*)malloc(sizeof(user));
		p1->next=NULL;
		fscanf(fp,"%ld %s %s %s %s %s %d\n",&p1->UserID,p1->true_name,p1->user_name,p1->sex,p1->phone,p1->code,&p1->borrow_num);
		if(strlen(p1->user_name)>29)//如果乱码，则继续执行while，直到文件结束（只有在文件为空（似空实非空）的时候才会乱码）
			continue;
		
		if(0==i)yonghu=p1;
		else p2->next=p1;
		p2=p1;
		i++;
	}
	fclose(fp);
}