无法使用C中的动态数组释放和分配结构

Question

我正在用C编写类似于通讯录的程序，该程序使您可以插入，编辑和删除联系人。它使用动态数组和动态分配。我在重新分配和释放内存时遇到问题。我正在发布主要功能和简化结构。

MAIN

int main() {
int i;
PeopleArray data;
dynamicArrayInit(&data);

while(i != 2){
printf("\n Insert 0 to add, 1 to edit, 2 to finish");
scanf("%d", &i);
switch(i){
case 0: appendP(&data, newP()); break; 
case 1: editP(&data, data.item); break; //This doesn't work
}
    return 0;
}

结构：1用于存储个人信息； 2个动态数组

typedef struct{
    char name[MAX_NAME];
    int number;
    double height;
}Person;

typedef struct{
    Person  *item;
    int elementsAmount;
}PeopleArray;

初始化数组的函数

void dynamicArrayInit(PeopleArray *array){
    array->item = NULL;
    array->elementsAmount = 0;
}

分配元素的功能

void appendPerson(PEOPLEARRAY *array, Person p){
    array->elementsAmount++;
    if(array->item == NULL) {
        array->item = (Person *) malloc(array->elementsAmount * sizeof(Person));
    }
    else {
        array->item = (Person *) realloc(array->item, array->elementsAmount * sizeof(Person));
    }
    if(array->item == NULL) {
        exit(-1);
    }
    array->item[array->elementsAmount-1] = p;
}

创建新元素的功能

Person newPerson(){
    Person p;
     printf("\n Name:");
     scanf("%64[^\n]s",p.name);
     checkInput(); //Cleans the buffer, it's a function 
     printf ("\n Number:");
     scanf("%d", p.number);
     checkInput(); 
     printf("\n height:");
     scanf("%lf", p.height);
     checkInput;
    return p;
 }

要编辑的功能

Person editPerson(PEOPLEARRAY *array, Person *p) {
    Person newP;
    int i, j, c;
    for (i = 0; i < arrayDimension(array); i++) {
        printf("\n %d ->%s", i, p->name);
    }
    printf("\n Insert your choice");
    scanf("%d", &j);
    checkInput();
     for (i = 0; i <= j; i++) {
        if (i == j) {
     newP.name == p->name; 
     newP.number == p->number; 
     newP.height == p->height; 
   printf("\nWhich field do you want to edit? 0 = name, 1 = number, 2 = height");
   scanf("%d", &c);
  switch(c){
  case 0: printf("\nThe person's name is %s what do you want to change it to?", p->name);
     scanf("%64[^\n]s", newP.name); //I assign a new name.
        break;
  case 1: printf("\nThe person's number is %d what do you want to change it to?", p->number);
     scanf("%64[^\n]s", newP.number); //I assign a new number.
     break;
  case 2:   printf("\nThe person's height is %lf what do you want to change it to?", p->height);
     scanf("%64[^\n]s", newP.height); //I assign a new height.
   break;
        }
    free (p);
    appendPerson(array,newP);
    }
  return newP;
    }

我所做的基本上是：打印所有名称，询问他们要编辑的名称，然后让他们编辑他们选择的名称，但首先我将所有旧值分配给新结构现在，此后，仍然在editPerson功能中，我应该：A）调配老人；B）分配新的；

但是，如果这样做，在编译并尝试之后，它不会取消分配该结构，甚至不会分配新的结构，而是会再次分配旧的结构。那么，我在做什么错，如何正确编辑此结构？

Answer 1

我自己找到了解决方案。编辑功能

Person editPerson(PEOPLEARRAY *array, Person *p) {
    Person newP;
    int i, j, c, k;
    for (i = 0; i < arrayDimension(array); i++) {
        printf("\n %d ->%s", i, p->name);
    }
    printf("\n Insert your choice");
    scanf("%d", &j);
    checkInput();
     for (i = 0; i <= j; i++) {
        if (i == j) {
    newP = *p;
     for(k=j; k<(array->elementsAmount-1); k++){
      array->item[k] = array->item[k+1];
      }
     if(array->item != NULL) {
      array->elementsAmount--;
     array->item = (Person *) realloc(array->item, array->elementsAmount * sizeof(Person));
                        }
   printf("\nWhich field do you want to edit? 0 = name, 1 = number, 2 = height");
   scanf("%d", &c);
  switch(c){
  case 0: printf("\nThe person's name is %s what do you want to change it to?",newP.name);
     scanf("%64[^\n]s", newP.name); //I assign a new name.
        break;
  case 1: printf("\nThe person's number is %d what do you want to change it to?", newP.number);
     scanf("%64[^\n]s", newP.number); //I assign a new number.
     break;
  case 2:   printf("\nThe person's height is %lf what do you want to change it to?", newP.height);
     scanf("%64[^\n]s", newP.height); //I assign a new height.
   break;
        }
    }

  return newP;
    }

Main

int main() {
int i;
PeopleArray data;
dynamicArrayInit(&data);

while(i != 2){
printf("\n Insert 0 to add, 1 to edit, 2 to finish");
scanf("%d", &i);
switch(i){
case 0: appendP(&data, newP()); break; 
case 1: appendP(&data,editPerson(&data, data.item)); break; 
}
    return 0;
}