有关链表的文件读取问题，求高手大大们解决一下
这个文件读取我是套用的数组的文件读取，但不知道为啥老是出错，求解，如果不能套用，如何解决链表的文件读取问题呢？
求前辈高手们不吝赐教！
奉上代码:
程序代码：#include<stdio.h>
#include<stdlib.h>
#include <string.h>
#define ERROR 0
#define OK 1
#define OVERFLOW -1
#define Status int
#define MAXSIZE 100
char filename[20];
typedef struct
{
char no[4];
char name[8];
int price;
}Student;
struct SqList
{
Student elem;
struct SqList *next;
};
int menu_filename()
{
system("cls");
printf("请输入你要操作的文件名:");
scanf("\t%s", filename);
}
Status InitList(struct SqList *L)//初始化
{
L->next = NULL;
return OK;
}
void DisplayList(struct SqList *L)//显示学生信息
{
FILE *fp;
struct SqList *tmp = L->next;
if ((fp = fopen(filename, "r")) == NULL) //以2进制方式读取文件信息//
{
printf("cannot open the files\n");
return;
}
while (!feof(fp))
{
fread(&L, sizeof(Student), 1, fp); //以2进制方式将文件信息读到链表内存中//一次读取一个//
L= L->next;
}
fclose(fp);
while (tmp != NULL)
{
printf("学号:%s姓名:%s分数:%d\n", tmp->elem.no, tmp->elem.name, tmp->elem.price);
tmp = tmp->next;
}
}
Status Searchelem(struct SqList *L, int i)//3查找对应的数据元素
{
FILE *fp;
struct SqList *tmp = L->next;
int j = 1;
if ((fp = fopen(filename, "r")) == NULL) //以2进制方式读取文件信息//
{
printf("cannot open the files\n");
system("pause");
return;
}
while (!feof(fp))
{
fread(&tmp, sizeof(Student), 1, fp); //以2进制方式将文件信息读到链表内存中//一次读取一个//
L = L->next;
}
while (tmp != NULL) {
if (i == j)
{
printf("第%d号：学号: %s姓名: %s分数: %d\n", i, tmp->elem.no, tmp->elem.name, tmp->elem.price);
return OK;
}
tmp = tmp->next;
j++;
}
return ERROR;
}
Status SearchElemName(struct SqList *L, char e[])//根据姓名查找
{
FILE *fp;
printf("查找\n");
struct SqList *tmp = L->next;
if ((fp = fopen(filename, "r")) == NULL) //以2进制方式读取文件信息//
{
printf("cannot open the files\n");
system("pause");
return;
}
while (!feof(fp))
{
fread(&L, sizeof(Student), 1, fp); //以2进制方式将文件信息读到链表内存中//一次读取一个//
L = L->next;
}
while (tmp != NULL)
{
if (!strcmp(tmp->elem.name, e)) {
printf("学号为%s,姓名为%s, 分数是%d\n", tmp->elem.no, tmp->elem.name, tmp->elem.price);
return OK;
}
tmp = tmp->next;
}
return ERROR;
}
Status InsertList(struct SqList *L, Student e)//4插入一个数据元素 头插
{
FILE *fp;
struct SqList *tmp = L;
struct SqList *new = (struct SqList *)malloc(sizeof(struct SqList));
new->elem = e;
new->next = tmp->next;
tmp->next = new;
if ((fp = fopen(filename, "a")) == NULL) //以2进制形式进行文件尾追加//
{
printf("cannot open the files\n");
return; //如果文件出现错误 就返回
}
while(L->next!=NULL)
{
if (fwrite(&L, sizeof(Student), 1, fp) != 1) //以2进制形式写入文件中//一次写入一个结点//
printf("file write error\n");
L = L->next;
}fclose(fp); //关闭文件
}
Status DeleteList(struct SqList *L, int i)//5删除一个数据元素
{
FILE *fp;
struct SqList *tmp = L;
struct SqList *del;
int j = 0;
if ((fp = fopen(filename, "r")) == NULL) //以2进制方式读取文件信息//
{
printf("cannot open the files\n");
system("pause");
return;
}
while (!feof(fp))
{
fread(&tmp, sizeof(Student), 1, fp);
L=L->next;
}i = 0;
fclose(fp);
if (i < 1)
return ERROR;
while (tmp != NULL)
{
if (j == i - 1)
{
del = tmp->next;
if (del == NULL)
break;
tmp->next = del->next;
free(del);
return OK;
}
tmp = tmp->next;
j++;
}
return ERROR;
}
Status ClearList(struct SqList *L)//6清空顺序表
{
FILE *fp;
if ((fp = fopen(filename, "r")) == NULL) //以2进制方式读取文件信息//
{
printf("cannot open the files\n");
system("pause");
return;
}
while (!feof(fp))
{
fread(&L, sizeof(Student), 1, fp);
L= L->next;
};
fclose(fp);
L->next = NULL;
return OK;
}
Status DestorySqList(struct SqList *L)//7销毁顺序表
{
L->next = NULL;
return OK;
}
int LengthList(struct SqList *L)//10取表的长度
{
int j = 0;
struct SqList *tmp = L->next;
while (tmp != NULL)
{
j++;
tmp = tmp->next;
}
return j;
}
int main()
{
menu_filename();
struct SqList *L = (struct SqList *)malloc(sizeof(struct SqList));
Student e;
int number, N;
int no;
int i, j;
char na[20];
printf("\n");
printf(" 欢迎使用学生信息管理系统（c语言任性版）！\n\n");
printf(" ******************************\n");
printf(" ** 1-创建学生信息表 **\n");
printf(" ** 2-查找学生信息表 **\n");
printf(" ** 3-显示学生信息 **\n");
printf(" ** 4-删除信息表 **\n");
printf(" ** 5-插入学生信息 **\n");
printf(" ** 6-显示学生个数 **\n");
printf(" ** 7-根据姓名查找 **\n");
printf(" ** 0-退出程序 **\n");
printf(" *****************************\n");
number = 1;
InitList(L);
while (number)
{
printf("请选择功能序号: ");
scanf("%d", &no);
switch (no)
{
case 1:
printf("创建成绩表,请输入您要输入学生人数：");
scanf("%d", &N);
for (j = 0;j < N;j++)
{
printf("请输入要插入学生的信息:\n 注：格式为 学号 姓名 分数,每个数据之间空格隔开\n\n");
scanf("%s%s%d", e.no, e.name, &e.price);
InsertList(L, e);
}
break;
case 2:
printf("请输入您要查找的序号: ");
scanf("%d", &i);
if (Searchelem(L, i))
printf("查找成功！\n");
else
printf("查找失败\n");
break;
case 3:
DisplayList(L);
break;
case 4:
printf("请输入第i个元素: ");
scanf("%d", &i);
if (DeleteList(L, i))
printf("删除成功\n");
else
printf("删除失败\n");
break;
case 5:
printf("请输入要插入学生的信息:\n 注：格式为 学号 姓名 分数,每个数据之间空格隔开\n");
scanf("%s%s%d", e.no, e.name, &e.price);
if (InsertList(L, e))
printf("插入成功");
else
printf("插入失败");
break;
case 6:
printf("一共有%d个学生信息！\n", LengthList(L));
break;
case 7:
printf("请输入要查找的名字");
scanf("%s", na);
number = 0;
break;
if (SearchElemName(L, na))
printf("查找成功");
else
printf("查找失败\n");
break;
default:
number = 0;
break;
}
}
return 0;
}
