Question

在将数组中的值赋给对象成员时出现问题这是我的代码

这是分段错误，但我不明白为什么我无法从编译中获得任何消息该程序只会崩溃感谢

FILE * openRead(char fName[]);
int setArray(FILE *fp, struct salesPerson* sRec[]);
#define EMPLOYEES 8

int main(){

FILE *fp=openRead("sales.dat");
struct salesPerson *instance[EMPLOYEES];
setArray(fp,instance);

return 0;

}

FILE * openRead(char fName[]){  //READS
FILE *fp;
fp=fopen(fName,"r");
if ((fp != NULL)){
   // printf("return succ");
    return fp;
}else{
    return 0;
}
}

int setArray(FILE *fp, struct salesPerson* sRec[]){

int  i,num[30],lpay[30];
char fname[30][30];
char lname[30][30];
double amount[30];
for (i=0;i<=EMPLOYEES;i++){
//while (!feof(fp)){
    if(fscanf(fp,"%d:%[^:]:%[^:]:%d:%lf",&num[i],lname[i],fname[i],&lpay[i],&amount[i]) != EOF){

    strcpy(sRec[i]->lastName,lname[i]);
    //strcpy(sRec[i]->firstName,fname);
    //sRec[i]->salesLevel=*lpay;
    //sRec[i]->salesAmount=amount;
    //printf("%s",sRec[i]->lastName);
    //if(fscanf(fp,"%d:%[^:]:%[^:]:%d :%f",&num,fname,lname,&payl,&amount) != EOF){

    printf("%s \n",fname[i]);
 }
    }
 return i;
 }

Answer 1

你的指针并没有指向有效的地方。

struct salesPerson *instance[EMPLOYEES];
setArray(fp,instance);

instance[0]（以及所有其他指针）指向哪里？

Answer 2

在向它写东西之前，你需要为你的指针分配内存。喜欢

instance[0] = malloc(sizeof(struct salesPerson));

Answer 3

for (i=0;i<EMPLOYEES;i++){// "<=" should be "<" 
    if(fscanf(fp,"%d:%[^:]:%[^:]:%d:%lf",&num[i],lname[i],fname[i],&lpay[i],&amount[i]) != EOF){
        sRec[i] = malloc(sizeof(struct salesPerson));//allocate structure
        strcpy(sRec[i]->lastName,lname[i]);
        //set to member of sRec ... 
    } else 
        break;
}

从文件扫描到结构

3 个答案: