[英]failing freeing dynamic struct array in c
I'm having some problem with freeing dynamic struct array and I can't understand why.我在释放动态结构数组时遇到了一些问题,我不明白为什么。
first of all there is this struct:首先有这个结构:
typedef struct
{
char name[LEN];
char address[MAX];
} Airport;
And the constructor I made for this struct isn't using allocation for this struct building.我为这个结构创建的构造函数没有使用这个结构构建的分配。
sec of all there is this struct:首先有这个结构:
typedef struct
{
Airport* airports;
int maxAPS;
int currentAPS;
} AirportManager;
//constructor
void addAirport(AirportManager* pAirportManager)
{
if (pAirportManager->maxAPS == pAirportManager->currentAPS)
{
pAirportManager->maxAPS++;
pAirportManager->airports = (Airport*)realloc(pAirportManager->airports, sizeof(Airport)*pAirportManager->maxAPS);
//pAirportManager->airports[pAirportManager->currentAPS] = *(Airport*)malloc(sizeof(Airport));
}....
and when I'm ending my program and want to free the AirportManager with the following code:当我结束程序并想使用以下代码释放 AirportManager 时:
void freeAirportManager(AirportManager* pAirportManager)
{
for (int i = 0; i < pAirportManager->currentAPS; i++)
free(&pAirportManager->airports[i]);
free(pAirportManager->airports);
}
I've debuged this one and all the parameters are just fine but after one run in the loop the program exits, what should I change in the free function?我已经调试了这个,所有参数都很好,但是在循环中运行一次后程序退出,我应该在免费的 function 中更改什么?
do I need the marked line in the constructor?我需要构造函数中的标记线吗? I just added this on thinking it might help, but seems to not work as well... do I need to free only the array itself?
我刚刚添加了这个,认为它可能会有所帮助,但似乎也不起作用......我是否只需要释放数组本身?
for (int i = 0; i < pAirportManager->currentAPS; i++)
free(&pAirportManager->airports[i]);
You need only to free pAirportManager->airports
.你只需要释放
pAirportManager->airports
。 You do not have pointer to pointer here.您在这里没有指向指针的指针。
So instead of those two lines:所以代替这两行:
free(pAirportManager->airports);
I would use flexible array member instead of pointer.我会使用灵活的数组成员而不是指针。
typedef struct
{
char name[LEN];
char address[MAX];
} Airport;
typedef struct
{
size_t maxAPS;
size_t currentAPS;
Airport airports[];
} AirportManager;
For sizes use size_t
type instead of int
对于尺寸,使用
size_t
类型而不是int
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