int Load()
{
    ListNode *p = pHead;
    ListNode *newNode = (ListNode*)malloc(sizeof(ListNode));
    FILE *pf = fopen("d:\\1.txt", "r");
    if (!pf)
    {
        puts("文件打开失败");
        exit(0);
    }
        while (fread(p,1,sizeof(ListNode),pf))
    {
        newNode->data = pd;
        newNode->pNext = NULL;
        if (!p)
        {
            p= newNode;
            return 0;
        }
        else
        {
            while (p->pNext)
            {
                p = p->pNext;
            }
            p->pNext = newNode;
        }
    }
    fclose(pf);
    return 1;
}
为什么只要走到    while (fread(p,1,sizeof(ListNode),pf))这步就报错，异常，请高手指点一下。