【c语言】关于文件的读写，并把数据读入单链表，大佬帮帮忙

[p383990056]

c语言没学好，代码都是参考别人的写的，但是还是不对关于读写有个问题，是不是可以先在txt上写好数据，然后直接写入。可以的话大佬给个代码吧。。
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

typedef struct worker
{
char workerNo[10];
char name[10];
char sex[2];
}workerinfo;

typedef struct node
{
workerinfo data;
struct node *next;
}ListNode,*LinkList;

LinkList createNullList_link()
{
LinkList llist=(LinkList)malloc(sizeof(struct node));
if(llist!=NULL)llist->next=NULL;
else
printf("Out of space!\n");
return llist;
}

void inputinfo()
{
FILE *fp;
workerinfo *s;
fp=fopen("信息表.txt","wb");
if(fp==NULL)
printf("打开文件失败！");
else
{
s=(workerinfo *)malloc(sizeof(workerinfo));
printf("请输入职工号：\n");
scanf("%s",s->workerNo);
while(strcmp(s->workerNo,"9999")!=0)
{
printf("请输入:姓名 性别\n");
scanf("%s %s",s->name,s->sex);
fwrite(s,sizeof(struct worker),1,fp);
memset(s,0,sizeof(workerinfo));
printf("请输入职工号：\n");
scanf("%s",s->workerNo);
}
if(s!=NULL)
{
free(s);
s=NULL;
}
}
fclose(fp);
}

LinkList displayinfo(LinkList head)
{
FILE *fp;
workerinfo *s;
ListNode *p,*q;
p=head;
fp=fopen("信息表.txt","rb");
if(fp==NULL)
printf("没有相应的职工信息！");
else
{
s=(workerinfo *)malloc(sizeof(workerinfo));
printf("职工号 姓名 性别\n");
while(!feof(fp))
{
memset(s,0,sizeof(workerinfo));
if(fread(s,sizeof(struct worker),1,fp)!=0)
{
printf("%s %s %s\n",s->workerNo,s->name,s->sex);
q=(ListNode *)malloc(sizeof(ListNode));
strcpy(q->data.workerNo,s->workerNo);
strcpy(q->data.name,s->name);
strcpy(q->data.sex,s->sex);
p->next=q;
p=p->next;
}


}
if(s!=NULL)
{
free(s);
s=NULL;
}
p->next=NULL;
fclose(fp);
}
return head;
}

void outputinfo(LinkList head)
{
ListNode *p;
p=head->next;
printf("职工号 姓名 性别\n");
while(p)
{
printf("%s %s %s\n",p->data.workerNo,p->data.name,p->data.sex);
p=p->next;
}
}
int main()
{
LinkList head;
head=createNullList_link();
head=displayinfo(head);
outputinfo(head);
printf("Hello world!\n");
return 0;
}

刚开始还没加入单链表的时候读写是可以正常运行的，后来加入了单链表之后就不知道怎么搞了。。

[赵4老师]

仅供参考：

//将c:\\tmp文件夹下的所有文件的内容全部放到用malloc分配的内存中
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <io.h>
struct FB {
    char fn[256];
    size_t fl;
    char *b;
    struct FB *next;
    struct FB *prev;
} *fh,*fb,*ft;
char ln[256];
char fpn[256];
FILE *af;
FILE *f;
int L,n;
int main() {
    system("dir /b /a-d c:\\tmp\\*.* >c:\\allfn.txt");
    af=fopen("c:\\allfn.txt","r");
    if (NULL==af) {
        printf("Can not open file c:\\allfn.txt!\n");
        return 1;
    }
    fh=NULL;
    fb=NULL;
    n=0;
    while (1) {
        if (NULL==fgets(ln,256,af)) break;
        L=strlen(ln);
        if ('\n'==ln[L-1]) ln[L-1]=0;
        printf("read %s\n",ln);
        strcpy(fpn,"c:\\tmp\\");
        strcat(fpn,ln);
        ft=(struct FB *)malloc(sizeof(struct FB));
        if (NULL==ft) {
            printf("Can not malloc ft!\n");
            fclose(af);
            return 2;//之前的malloc在main退出后由操作系统自动free
        }
        printf("ft[%d]==%p\n",n,ft);
        strcpy(ft->fn,fpn);
        f=fopen(fpn,"rb");
        if (NULL==f) {
            printf("Can not open file %s!\n",fpn);
            fclose(af);
            return 3;//之前的malloc在main退出后由操作系统自动free
        }
        ft->fl=_filelength(fileno(f));
        ft->b=malloc(ft->fl);
        if (NULL==ft->b) {
            printf("Can not malloc ft->b!\n");
            fclose(f);
            fclose(af);
            return 4;//之前的malloc在main退出后由操作系统自动free
        }
        printf("ft[%d]->b==%p\n",n,ft->b);
        if (ft->fl!=fread(ft->b,1,ft->fl,f)) {
            printf("fread error!\n");
            fclose(f);
            fclose(af);
            return 5;//之前的malloc在main退出后由操作系统自动free
        }
        fclose(f);
        ft->next=NULL;

        if (NULL==fh) {
            ft->prev=NULL;
            fh=ft;
        } else {
            fb->next=ft;
            ft->prev=fb;
        }
        fb=ft;
        n++;
    }
    fclose(af);
    printf("-----list-----\n");
    for (ft=fh;NULL!=ft;ft=ft->next) {
        printf("%8d %s\n",ft->fl,ft->fn);
        if (NULL!=ft) fb=ft;
    }
    printf("-----free-----\n");
    n--;
    if (NULL!=fh) {
        for (ft=fb->prev;NULL!=ft;ft=ft->prev) {
            if (NULL!=ft->next->b) {
                printf("ft[%d]->b==%p\n",n,ft->next->b);
                free(ft->next->b);
            }
            if (NULL!=ft->next) {
                printf("ft[%d]==%p\n",n,ft->next);
                free(ft->next);
            }
            n--;
        }
        if (NULL!=fh->b) {
            printf("ft[0]->b==%p\n",fh->b);
            free(fh->b);
        }
        printf("ft[0]==%p\n",fh);
        free(fh);
    }
    return 0;
}
//C:\tmp\tmp\Debug>dir /a-d c:\tmp
// 驱动器 C 中的卷是 C_HD5_1
// 卷的序列号是 1817-D526
//
// c:\tmp 的目录
//
//找不到文件
//
//C:\tmp\tmp\Debug>tmp
//找不到文件
//-----list-----
//-----free-----
//
//C:\tmp\tmp\Debug>dir /a-d c:\tmp
// 驱动器 C 中的卷是 C_HD5_1
// 卷的序列号是 1817-D526
//
// c:\tmp 的目录
//
//2011-06-30  18:04            44,840 my_c.rar
//2011-06-30  17:18             1,036 err.frm
//2011-06-30  14:32            14,243 出租.txt
//2011-06-28  12:08            23,681 MSDN98书签.txt
//             4 个文件         83,800 字节
//             0 个目录 17,041,870,848 可用字节
//
//C:\tmp\tmp\Debug>tmp
//read my_c.rar
//ft[0]==00421800
//ft[0]->b==00520068
//read err.frm
//ft[1]==00421670
//ft[1]->b==0052AFC0
//read 出租.txt
//ft[2]==00421530
//ft[2]->b==00378F28
//read MSDN98书签.txt
//ft[3]==004213F0
//ft[3]->b==0052B3F8
//-----list-----
// 44840 c:\tmp\my_c.rar
//  1036 c:\tmp\err.frm
// 14243 c:\tmp\出租.txt
// 23681 c:\tmp\MSDN98书签.txt
//-----free-----
//ft[3]->b==0052B3F8
//ft[3]==004213F0
//ft[2]->b==00378F28
//ft[2]==00421530
//ft[1]->b==0052AFC0
//ft[1]==00421670
//ft[0]->b==00520068
//ft[0]==00421800
//
//C:\tmp\tmp\Debug>

[自信男孩]

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

typedef struct worker
{
    char workerNo[10];
    char name[10];
    char sex[2];
}workerinfo;

typedef struct node
{
    workerinfo data;
    struct node *next;
}ListNode,*LinkList;

LinkList createNullList_link()
{
    LinkList llist = (LinkList)malloc(sizeof(struct node));
    if(llist)
        llist->next = NULL;
    else
        printf("Out of space!\n");
    return llist;
}

void inputinfo()
{
    FILE *fp;
    workerinfo *s;
    fp = fopen("信息表.txt","wb");
    if(!fp)
        printf("打开文件失败！");
    else
    {
        s = (workerinfo *)malloc(sizeof(workerinfo));
        printf("请输入职工号：\n");
        scanf("%s", s->workerNo);
        while(strcmp(s->workerNo, "9999")!=0)
        {
            printf("请输入:姓名 性别\n");
            scanf("%s %s", s->name, s->sex);
            fwrite(s,sizeof(struct worker), 1, fp);
            memset(s, 0, sizeof(workerinfo));
            printf("请输入职工号：\n");
            scanf("%s", s->workerNo);
        }
        if(s)
        {
            free(s);
            s = NULL;
        }
    }
    fclose(fp);
}

LinkList displayinfo(LinkList head)
{
    FILE *fp;
    workerinfo *s;
    ListNode *p,*q;

    p = head;
    fp = fopen("信息表.txt","rb");
    if(!fp) {
        printf("没有相应的职工信息！");
    }
    else
    {
        s = (workerinfo *)malloc(sizeof(workerinfo));
        printf("职工号 姓名 性别\n");
        while(!feof(fp))
        {
            memset(s,0,sizeof(workerinfo));
            if(fread(s, sizeof(struct worker), 1, fp) != 0)
            {
                printf("%s %s %s\n", s->workerNo, s->name, s->sex);
                q = (ListNode *)malloc(sizeof(ListNode));
                strcpy(q->data.workerNo, s->workerNo);
                strcpy(q->data.name, s->name);
                strcpy(q->data.sex, s->sex);
                p->next = q;
                p = p->next;
            }


        }
        if(s)
        {
            free(s);
            s = NULL;
        }
        p->next = NULL;
        fclose(fp);
    }
    return head;
}

void outputinfo(LinkList head)
{
    ListNode *p;
    p = head->next;
    printf("职工号 姓名 性别\n");
    while(p)
    {
        printf("%s %s %s\n",p->data.workerNo,p->data.name,p->data.sex);
        p = p->next;
    }
}
int main(void)
{
    LinkList head;
    head = createNullList_link();
    inputinfo();
    head = displayinfo(head);
    outputinfo(head);
    printf("Hello world!\n");
    return 0;
}

程序主要是在main函数里没有调用inputinfo()；函数，该函数是将数据写入文件的，即没有该文件，后面的displayinfo就打不开文件。