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CRT detected that the application wrote to memory after end of heap buffer.

2024-07-12 10:47:29   218人阅读

很多人的解释都不一样,  我碰到的问题是,开辟的内存空间小于操作的内存空间.也就是说,我free的内存越界了.

这是我开辟链表结构体内存的代码:

 1 PNODE Create() { 2     int len;    //total count of nodes to be created. 3     int i; 4     int val; //temp value for the current node. 5     printf("enter the size of nodes:"); 6     scanf("%d", &len); 7     PNODE pHead = (PNODE)malloc(sizeof(PNODE)); 8     pHead->pNext = NULL; 9     PNODE pTail = pHead;10 11     if(NULL == pHead) {12         printf("allocate memory failed!");13         exit(0);14     }15     for (i = 0; i < len; i++)16     {17         PNODE pCur = (PNODE)malloc(sizeof(PNODE));18         if(NULL == pCur) {19             printf("allocate memory failed!");20             exit(0);21         }22         printf("enter the %d-th value : ", i + 1);23         scanf("%d", &val);24         pCur->data =http://www.mamicode.com/ val;25 26         //set the new node as the tail node.27         pTail->pNext = pCur;    28         pCur->pNext = NULL;29         pTail = pCur;30     }31     return pHead;32 }

我是这样定义结构体的:

1 typedef struct node {2     int data;3     struct node * pNext;4 } NODE, * PNODE;

删除元素时(报错的代码)为:

 1 bool Delete(PNODE pHead, int pos, int *v) { 2     int i = -1; 3     PNODE pNode = pHead; 4     while((i < pos - 1) && pNode != NULL) { 5         pNode = pNode->pNext; 6         i++; 7     } 8     if(pos < i || pNode == NULL) 9         return false;10     PNODE pTmp = pNode->pNext;    //store to free later.11     *v = pTmp->data;12     pNode->pNext = pNode->pNext->pNext;13     free(pTmp);14     pTmp = NULL;15     return true;16 }

　　这段代码我翻来覆去地调试,发现所有的节点的指针域和数据域都是我期待的.就是在free的时候报了错.

原来是我开辟内存的时候,大小指定错了,应该把:

1 PNODE pNew = (PNODE)malloc(sizeof(PNODE));

改为:

1 PNODE pNew = (PNODE)malloc(sizeof(NODE));

开辟节点的大小应该为结构体的大小,其实我在‘插入‘新节点的时候,这行代码就写错了,但是不会报错.我觉得应该是没有释放.


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