user-0 提问: 【c语言】关于文件的读写，并把数据读入单链表，大佬帮帮忙

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user: user-1
content: #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。

user: user-2
content: 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>