C语言文件读取写入的问题

我用以下代码进行读写操作一次以后，文件照常写入，可是第二次读取后就有一部分莫名消失
求大神指点

typedef struct Shu{//存储站名序号// 
    char name[10];
    int x;
    struct Shu *next;
}*S,s;
void BC2(S *head){//保存所有站点编号// 
    FILE *f;
    S p=*head;
    f=fopen("Shu.txt","w+");
    while(p!=NULL){
        fwrite(p,sizeof(s),1,f);
        p=p->next;
    }
    fclose(f);
}
struct Shu *Read2(){//读取所有站点编号// 
    FILE *f;
    S head,p;
    head=(S)malloc(sizeof(s));
    head->next=NULL;
    f=fopen("Shu.txt","r+");
    p=head;
    while(1){
        Shu* q;
        q=(S)malloc(sizeof(s));
        fread(q,sizeof(s),1,f);
        if(feof(f)){
            p->next=NULL;
            free(q);
            break;
        }
        q->next=NULL;
        p->next=q;
        p=q;
    }
    fclose(f);
    return head;
}

#include<stdio.h>
#include<string.h>
#include<stdlib.h>
typedef struct Shu{//存储站名序号// 
    char name[10];
    int x;
    struct Shu *next;
}*S,s;
typedef struct Zhan{
    char name[10];
    int sum;//存储到下一个站的距离// 
    int x;//标记序号// 
    struct Zhan *next;
}*Z,z;
typedef struct Lu{
    char name[10];
    struct Lu *next;
}*L,l;
bool meue3();
struct Lu *Read1();
struct Shu *Read2();
struct Zhan *Read3(char *);
void BC1(L *);
void BC2(S *);
void BC3(Z *,char *);
void Zhan_add(L *,S *);
void Zhan_xg(L *,S *);
void Zhan_shan(L *);
void put(L *,char *,Z *);
int search(S *,char *);
int main(){
     while(meue3()){
     }
     return 0;
}
int search(S *H2,char *N){//给站点编号//
    int n=0;
    S h2=*H2;
    n=h2->x;
    while(h2!=NULL){
        if(strcmp(N,h2->name)==0){
            return h2->x;
        }
        h2=h2->next;
    }
    n++;
    S h3=(S)malloc(sizeof(s));
    h3->next=NULL;
    strcpy(h3->name,N);
    h3->x=n;
    h3->next=(*H2);
    (*H2)=h3;
    return n;
}
void Zhan_add(L *H1,S *H2){
    char n[10],N[10];
    Z H3=NULL,h3;
    printf("输入要操作的公交线路\n");
    scanf("%s",N);
    put(&(*H1),N,&H3);
    if(H3!=NULL){
        h3=H3;
        while(h3->next->next!=NULL)
        h3=h3->next;//h3指向公交车倒数第二个站点// 
        Z h2=(Z)malloc(sizeof(z));
        h2->next=NULL;
        printf("\n输入要插入的站名\n");
        scanf("%s",&h2->name);
        int i; 
        h2->x=search(&(*H2),h2->name);//给站点编号// 
        h2->sum=0;
        printf("1.设置新的起点 2.设置新的终点 3.插入新站\n");
        scanf("%d",&i);
        switch(i){
            case 1:
                printf("输入%s到%s的距离\n",h2->name,H3->name);
                scanf("%d",&h2->sum);
                h2->next=H3;
                H3=h2;
                break;
            case 2:
                h3=h3->next;
                printf("输入%s到%s的距离\n",h3->name,h2->name);
                scanf("%d",&h3->sum);
                h3->next=h2;
                break;
            case 3:
                Z h4=H3;
                printf("输入要插入的位置的前面一个站点\n");
                scanf("%s",n);
                while(h4!=NULL){
                    if(strcmp(h4->name,n)==0){
                        printf("输入%s站到%s站的距离\n",h4->name,h2->name);
                        scanf("%d",&h4->sum);
                        printf("输入%s站到%s站的距离\n",h2->name,h4->next->name);
                        scanf("%d",&h2->sum);
                        h2->next=h4->next;
                        h4->next=h2;
                        break;
                    }
                    h4=h4->next;
                }
                break;
        }
        BC3(&H3,N);
        printf("成功添加站点\n");
    }
}
void Zhan_xg(L *H1,S *H2){
    char n[10],N[10];
    Z H3=NULL,h3,h4;
    printf("输入要操作的公交线路\n");
    scanf("%s",N);
    put(&(*H1),N,&H3);
    if(H3!=NULL){
        h3=H3;
        while(h3->next->next!=NULL)
        h3=h3->next;//h3指向公交车倒数第二个站点// 
        h4=H3;
        Z h2=(Z)malloc(sizeof(z));
        h2->next=NULL;
        printf("\n输入要修改的站点\n");
        scanf("%s",n);
        printf("输入新的站点名\n");
        scanf("%s",&h2->name);
        h2->sum=0;
        h2->x=search(&(*H2),h2->name);
        if(strcmp(h4->name,n)==0){//修改节点为头节点// 
            printf("输入%s站到%s站的距离\n",h2->name,h4->next->name);
            scanf("%d",&h2->sum);
            h2->next=H3->next;
            H3=h2;
        }
        else if(strcmp(h3->next->name,n)==0){//修改节点为尾节点// 
            printf("输入%s站到%s站的距离\n",h3->name,h2->name);
            scanf("%d",&h3->sum);
            h3->next=h2; 
        }
        else{
            while(h4!=NULL){
                if(strcmp(h4->next->name,n)==0){
                    printf("输入%s站到%s站的距离\n",h4->name,h2->name);
                    scanf("%d",&h4->sum);
                    printf("输入%s站到%s站的距离\n",h2->name,h4->next->next->name);
                    scanf("%d",&h2->sum);
                    h2->next=h4->next->next;
                    h4->next=h2;
                    break;
                }
                h4=h4->next;
            }
        }
        printf("成功修改站点\n");
        BC3(&H3,N);
    }
}
void Zhan_shan(L *H1){
    char n[10],N[10];
    Z H2=NULL,h3,h2;
    printf("输入要操作的公交线路\n");
    scanf("%s",N);
    put(&(*H1),N,&H2);
    if(H2!=NULL){
        h3=H2;
        while(h3->next->next!=NULL)
        h3=h3->next;//h3指向公交车倒数第二个站点// 
        printf("\n输入要删除的站点:\n");
        scanf("%s",n);
        h2=H2;
        if(strcmp(h2->name,n)==0){//删除站点为头节点//
            H2=H2->next;
        }
        else if(strcmp(h3->next->name,n)==0){//删除站点为尾节点//
            h3->next=NULL;
            h3->sum=0;
        }
        else{
            while(h2!=NULL){
                if(strcmp(h2->next->name,n)==0){
                    printf("输入%s站到%s站的距离:\n",h2->name,h2->next->next->name);
                    scanf("%d",&h2->sum);
                    h2->next=h2->next->next;
                    break;
                }
                h2=h2->next;
            }
        }
        BC3(&H2,N);
        printf("成功删除站点\n");
    }
}
bool meue3(){
    bool N=true;
    L H1;
    H1=Read1();
    H1=H1->next;
    S H2;
    H2=Read2();
    H2=H2->next;
    printf("1.站点添加  2.站点修改  3.站点删除  4.返回主页面\n");
    int n;
    scanf("%d",&n);
    switch(n){
        case 1:
            Zhan_add(&H1,&H2);
            BC2(&H2);
            break;
        case 2:
            Zhan_xg(&H1,&H2);
            BC2(&H2);
            break;
        case 3:
            Zhan_shan(&H1);
            break;
        case 4:
            N=false;
            break;
    } 
    BC1(&H1);
    return N;
}
void put(L *H1,char *N,Z *H2){
    L h1=*H1;
    while(h1!=NULL){
        if(strcmp(h1->name,N)==0)
        break;
        h1=h1->next;
    }
    if(h1==NULL)
    printf("没有找到该公交线\n");
    else{
        printf("%s公交路线如下：\n",N);
        (*H2)=Read3(N);
        (*H2)=(*H2)->next;
        Z h3=(*H2),h2=(*H2);
        printf("%s %d %d",h2->name,h2->sum,h2->x);
        h2=h2->next;
        if(h2!=NULL){
            while(h2!=NULL){//输出所有站// 
                printf("->%s %d %d",h2->name,h2->sum,h2->x);
                h2=h2->next;
            }
        }
    }
}
void BC3(Z *head,char *N){//保存公交路线的所有站点// 
    FILE *f;
    Z p=(*head);
    char F[200]="C:\\Users\\许和伟\\Desktop\\";
    strcat(F,N);
    char f1[10]=".txt";
    strcat(F,f1);
    f=fopen(F,"w+");
    while(p!=NULL){
        fwrite(p,sizeof(z),1,f);
        p=p->next;
    }
    fclose(f);
}
struct Zhan *Read3(char *N){//读取公交路线的所有站点// 
    FILE *f;
    char F[200]="C:\\Users\\许和伟\\Desktop\\";
    strcat(F,N);
    char f1[10]=".txt";
    strcat(F,f1);
    f=fopen(F,"r+");
    Z p,head;
    head=(Z)malloc(sizeof(z));
    head->next=NULL;
    p=head;
    while(1){
        Z q;
        q=(Z)malloc(sizeof(z));
        fread(q,sizeof(z),1,f);
        if(feof(f)){
            p->next=NULL;
            break;
        }
        p->next=q;
        p=q;
        p->next=NULL;
    }
    fclose(f);
    return head;
}
void BC2(S *head){//保存所有站点编号// 
    FILE *f;
    S p=*head;
    f=fopen("Shu.txt","w+");
    while(p!=NULL){
        fwrite(p,sizeof(s),1,f);
        p=p->next;
    }
    fclose(f);
}
struct Shu *Read2(){//读取所有站点编号// 
    FILE *f;
    S head,p;
    head=(S)malloc(sizeof(s));
    head->next=NULL;
    f=fopen("Shu.txt","r+");
    p=head;
    while(1){
        Shu* q;
        q=(S)malloc(sizeof(s));
        fread(q,sizeof(s),1,f);
        if(feof(f)){
            p->next=NULL;
            free(q);
            break;
        }
        q->next=NULL;
        p->next=q;
        p=q;
    }
    fclose(f);
    return head;
}
void BC1(L *head){//保存所有公交名字// 
    FILE *f;
    L p=(*head);
    f=fopen("LU.txt","w+");
    while(p!=NULL){
        fwrite(p,sizeof(l),1,f);
        p=p->next;
    }
    fclose(f);
}
struct Lu *Read1(){//读取所有公交名字//
    FILE *f;
    L head,p;
    head=(L)malloc(sizeof(l));
    head->next=NULL;
    f=fopen("LU.txt","r+");
    p=head;
    while(!feof(f)){
        L q;
        q=(L)malloc(sizeof(l));
        fread(q,sizeof(l),1,f);
        if(feof(f)){
            free(q);
            break;
        }
        p->next=q;
        p=q;
        p->next=NULL;
    }
    fclose(f);
    return head;
}

打开一次文件，你一直就只读了文件开始sizeof(s)字节，所以永远读的第一个，写也是一样的道理！希望对你有帮助！

f=fopen("Shu.txt","w+");
->
f=fopen("Shu.txt","a+");

你这个程序不完整，有完整点的吗？我可以帮着调试一下

#include
#include
#include
typedef struct Shu{//存储站名序号//
char name[10];
int x;
struct Shu next;
}*S,s;
typedef struct Zhan{
char name[10];
int sum;//存储到下一个站的距离//
int x;//标记序号//
struct Zhan *next;
}*Z,z;
typedef struct Lu{
char name[10];
struct Lu *next;
}*L,l;
bool meue3();
struct Lu *Read1();
struct Shu *Read2();
struct Zhan *Read3(char *);
void BC1(L *);
void BC2(S *);
void BC3(Z *,char *);
void Zhan_add(L *,S *);
void Zhan_xg(L *,S *);
void Zhan_shan(L *);
void put(L *,char *,Z *);
int search(S *,char *);
int main(){
while(meue3()){
}
return 0;
}
int search(S *H2,char *N){//给站点编号//
int n=0;
S h2=*H2;
n=h2->x;
while(h2!=NULL){
if(strcmp(N,h2->name)==0){
return h2->x;
}
h2=h2->next;
}
n++;
S h3=(S)malloc(sizeof(s));
h3->next=NULL;
strcpy(h3->name,N);
h3->x=n;
h3->next=(*H2);
(*H2)=h3;
return n;
}
void Zhan_add(L *H1,S *H2){
char n[10],N[10];
Z H3=NULL,h3;
printf("输入要操作的公交线路\n");
scanf("%s",N);
put(&(*H1),N,&H3);
if(H3!=NULL){
h3=H3;
while(h3->next->next!=NULL)
h3=h3->next;//h3指向公交车倒数第二个站点//
Z h2=(Z)malloc(sizeof(z));
h2->next=NULL;
printf("\n输入要插入的站名\n");
scanf("%s",&h2->name);
int i;
h2->x=search(&(*H2),h2->name);//给站点编号//
h2->sum=0;
printf("1.设置新的起点 2.设置新的终点 3.插入新站\n");
scanf("%d",&i);
switch(i){
case 1:
printf("输入%s到%s的距离\n",h2->name,H3->name);
scanf("%d",&h2->sum);
h2->next=H3;
H3=h2;
break;
case 2:
h3=h3->next;
printf("输入%s到%s的距离\n",h3->name,h2->name);
scanf("%d",&h3->sum);
h3->next=h2;
break;
case 3:
Z h4=H3;
printf("输入要插入的位置的前面一个站点\n");
scanf("%s",n);
while(h4!=NULL){
if(strcmp(h4->name,n)==0){
printf("输入%s站到%s站的距离\n",h4->name,h2->name);
scanf("%d",&h4->sum);
printf("输入%s站到%s站的距离\n",h2->name,h4->next->name);
scanf("%d",&h2->sum);
h2->next=h4->next;
h4->next=h2;
break;
}
h4=h4->next;
}
break;
}
BC3(&H3,N);
printf("成功添加站点\n");
}
}
void Zhan_xg(L *H1,S *H2){
char n[10],N[10];
Z H3=NULL,h3,h4;
printf("输入要操作的公交线路\n");
scanf("%s",N);
put(&(*H1),N,&H3);
if(H3!=NULL){
h3=H3;
while(h3->next->next!=NULL)
h3=h3->next;//h3指向公交车倒数第二个站点//
h4=H3;
Z h2=(Z)malloc(sizeof(z));
h2->next=NULL;
printf("\n输入要修改的站点\n");
scanf("%s",n);
printf("输入新的站点名\n");
scanf("%s",&h2->name);
h2->sum=0;
h2->x=search(&(*H2),h2->name);
if(strcmp(h4->name,n)==0){//修改节点为头节点//
printf("输入%s站到%s站的距离\n",h2->name,h4->next->name);
scanf("%d",&h2->sum);
h2->next=H3->next;
H3=h2;
}
else if(strcmp(h3->next->name,n)==0){//修改节点为尾节点//
printf("输入%s站到%s站的距离\n",h3->name,h2->name);
scanf("%d",&h3->sum);
h3->next=h2;
}
else{
while(h4!=NULL){
if(strcmp(h4->next->name,n)==0){
printf("输入%s站到%s站的距离\n",h4->name,h2->name);
scanf("%d",&h4->sum);
printf("输入%s站到%s站的距离\n",h2->name,h4->next->next->name);
scanf("%d",&h2->sum);
h2->next=h4->next->next;
h4->next=h2;
break;
}
h4=h4->next;
}
}
printf("成功修改站点\n");
BC3(&H3,N);
}
}
void Zhan_shan(L *H1){
char n[10],N[10];
Z H2=NULL,h3,h2;
printf("输入要操作的公交线路\n");
scanf("%s",N);
put(&(*H1),N,&H2);
if(H2!=NULL){
h3=H2;
while(h3->next->next!=NULL)
h3=h3->next;//h3指向公交车倒数第二个站点//
printf("\n输入要删除的站点:\n");
scanf("%s",n);
h2=H2;
if(strcmp(h2->name,n)==0){//删除站点为头节点//
H2=H2->next;
}
else if(strcmp(h3->next->name,n)==0){//删除站点为尾节点//
h3->next=NULL;
h3->sum=0;
}
else{
while(h2!=NULL){
if(strcmp(h2->next->name,n)==0){
printf("输入%s站到%s站的距离:\n",h2->name,h2->next->next->name);
scanf("%d",&h2->sum);
h2->next=h2->next->next;
break;
}
h2=h2->next;
}
}
BC3(&H2,N);
printf("成功删除站点\n");
}
}
bool meue3(){
bool N=true;
L H1;
H1=Read1();
H1=H1->next;
S H2;
H2=Read2();
H2=H2->next;
printf("1.站点添加 2.站点修改 3.站点删除 4.返回主页面\n");
int n;
scanf("%d",&n);
switch(n){
case 1:
Zhan_add(&H1,&H2);
BC2(&H2);
break;
case 2:
Zhan_xg(&H1,&H2);
BC2(&H2);
break;
case 3:
Zhan_shan(&H1);
break;
case 4:
N=false;
break;
}
BC1(&H1);
return N;
}
void put(L *H1,char *N,Z *H2){
L h1=*H1;
while(h1!=NULL){
if(strcmp(h1->name,N)==0)
break;
h1=h1->next;
}
if(h1==NULL)
printf("没有找到该公交线\n");
else{
printf("%s公交路线如下：\n",N);
(*H2)=Read3(N);
(*H2)=(*H2)->next;
Z h3=(*H2),h2=(*H2);
printf("%s %d %d",h2->name,h2->sum,h2->x);
h2=h2->next;
if(h2!=NULL){
while(h2!=NULL){//输出所有站//
printf("->%s %d %d",h2->name,h2->sum,h2->x);
h2=h2->next;
}
}
}
}
void BC3(Z *head,char *N){//保存公交路线的所有站点//
FILE *f;
Z p=(*head);
char F[200]="C:\Users\许和伟\Desktop\";
strcat(F,N);
char f1[10]=".txt";
strcat(F,f1);
f=fopen(F,"w+");
while(p!=NULL){
fwrite(p,sizeof(z),1,f);
p=p->next;
}
fclose(f);
}
struct Zhan *Read3(char *N){//读取公交路线的所有站点//
FILE *f;
char F[200]="C:\Users\许和伟\Desktop\";
strcat(F,N);
char f1[10]=".txt";
strcat(F,f1);
f=fopen(F,"r+");
Z p,head;
head=(Z)malloc(sizeof(z));
head->next=NULL;
p=head;
while(1){
Z q;
q=(Z)malloc(sizeof(z));
fread(q,sizeof(z),1,f);
if(feof(f)){
p->next=NULL;
break;
}
p->next=q;
p=q;
p->next=NULL;
}
fclose(f);
return head;
}
void BC2(S *head){//保存所有站点编号//
FILE *f;
S p=*head;
f=fopen("Shu.txt","w+");
while(p!=NULL){
fwrite(p,sizeof(s),1,f);
p=p->next;
}
fclose(f);
}
struct Shu *Read2(){//读取所有站点编号//
FILE *f;
S head,p;
head=(S)malloc(sizeof(s));
head->next=NULL;
f=fopen("Shu.txt","r+");
p=head;
while(1){
Shu q;
q=(S)malloc(sizeof(s));
fread(q,sizeof(s),1,f);
if(feof(f)){
p->next=NULL;
free(q);
break;
}
q->next=NULL;
p->next=q;
p=q;
}
fclose(f);
return head;
}
void BC1(L *head){//保存所有公交名字//
FILE *f;
L p=(*head);
f=fopen("LU.txt","w+");
while(p!=NULL){
fwrite(p,sizeof(l),1,f);
p=p->next;
}
fclose(f);
}
struct Lu *Read1(){//读取所有公交名字//
FILE *f;
L head,p;
head=(L)malloc(sizeof(l));
head->next=NULL;
f=fopen("LU.txt","r+");
p=head;
while(!feof(f)){
L q;
q=(L)malloc(sizeof(l));
fread(q,sizeof(l),1,f);
if(feof(f)){
free(q);
break;
}
p->next=q;
p=q;
p->next=NULL;
}
fclose(f);
return head;
}

这个问题其实很简单，我直接上代码吧，记得给一个分
//获取文件指针
FILE *pFile = fopen("1.txt", //打开文件的名称
"w"); // 文件打开方式如果原来有内容也会销毁
//向文件写数据
fwrite ("hello", //要输入的文字
1,//文字每一项的大小以为这里是字符型的就设置为1 如果是汉字就设置为4
strlog("hello"), //单元个数我们也可以直接写5
pFile //我们刚刚获得到的地址
);
//fclose(pFile); //告诉系统我们文件写完了数据更新，但是我们要要重新打开才能在写
fflush(pFile); //数据刷新数据立即更新

运行的时候没有出错的话就是sizeof(s)出错了，改一下就好