C语言获取结构体变量地址并且输出结构体变量任意地址的数据

#include<stdio.h>

 typedef struct Test{
    float Item1;
    char Item2;
    int Item3;
    short Item4;
    long Item5;
    double Item6;    
}TestStr1;

int main(){

    struct Test TestStr;
    void *Ptr;

    TestStr.Item1 =1.11;
    TestStr.Item2 =2;
    TestStr.Item3 =33;
    TestStr.Item4 =44;
    TestStr.Item5 =55;
    TestStr.Item6 =66.6;

    printf("offsets: Item1=%ld; Item2=%ld; Item3=%ld Item4=%ld Item5=%ld Item6=%ld\n",
            (long) &(((TestStr1*)0)->Item1),
            (long) &(((TestStr1*)0)->Item2),
            (long) &(((TestStr1*)0)->Item3),
            (long) &(((TestStr1*)0)->Item4),
            (long) &(((TestStr1*)0)->Item5),
            (long) &(((TestStr1*)0)->Item6));
                   
    Ptr = (char *)&TestStr;
   printf("Item1 = %f\r\n" ,*(float *)(Ptr +(long) &(((TestStr1*)0)->Item1)));
   printf("Item2 = %d\r\n" ,*(char *)(Ptr +(long) &(((TestStr1*)0)->Item2)));
   printf("Item3 = %d\r\n" ,*(int *)(Ptr +(long) &(((TestStr1*)0)->Item3)));
   printf("Item4 = %d\r\n" ,*(short *)(Ptr +(long) &(((TestStr1*)0)->Item4)));
   printf("Item5 = %d\r\n" ,*(long *)(Ptr +(long) &(((TestStr1*)0)->Item5)));
   printf("Item6 = %f\r\n" ,*(double *)(Ptr +(long) &(((TestStr1*)0)->Item6)));
    return 0;
}