用C中的函数填充typedef结构

Question

I want to fill typedef struct by function. I tried:

typedef struct{
    char *first_name, *last_name;
    int id;
    Date birthday;
} Person;

void ReadPerson(Person* person){
    person = (Person*)malloc(sizeof(Person));
    person->first_name = readString();
    person->last_name = readString();
    scanf("%d",&(person->id));
    ReadDate(&(person->birthday));
}

the main function:

void main(){
    Person *tmp = NULL;
    ReadPerson(tmp);
}

After calling ReadPerson tmp with Bad Ptr value.

Answer 1

Maybe it will be more elegant if you malloc a variable in the same code segment when it is defined. If you are defining "Person *tmp" to store the info in main(), then also use malloc in main(). Delete malloc on ReadPerson().