//学生结构体typedef struct student{    char name[20];  //姓名    char sex;       //性别    int age;        //年龄}Student;int main(int argc, const char * argv[]){    Student stu={"xiaorui",‘f‘,24};    NSValue *structObject={0};
    //将结构体转换为对象    structObject=[NSValue value:&stu withObjCType:@encode(Student)];    NSLog(@"%@",structObject);        //将对象转换为结构体    Student stu2={0};    [structObject getValue:&stu2];    NSLog(@"%s %c %d",stu2.name,stu2.sex,stu2.age);
    return 0;}