QT案例词典 -- 释放堆区空间及查询单词

void free_dict(struct dict* tmp)
{
    int i = 0;
    for (i = 0; i < MAX; i++)
    {
        //释放指针变量
        if (tmp[i].key!=NULL)
        {
            free(tmp[i].key);
            tmp[i].key = NULL;
        }
        if (tmp[i].content!=NULL)
        {
            free(tmp[i].content);
            tmp[i].content = NULL;
        }
    }
    //释放结构体变量
    free(tmp);
    tmp = NULL;

int searc_dict(struct dict* tmp,char *key,char *content)
{
    int i = 0;
    for (i=0;i<MAX;i++)
    {
        if (strcmp(tmp[i].key, key) == 0)
        {
            //有结果，将翻译赋值
            strcpy_s(content,30,tmp[i].content);
            return 1;
        }
    }
    return 0;
}
char key[1024];
    char content[1024];
    while (1)
    {
        printf("请输入需要查询的单词：");
        scanf_s("%s",key,10);
        if(strcmp(key,"q")==0)
        {
            break;
        }
        //如果有返回真，没有返回假
        int flag = searc_dict(p,key,content);
        if (flag==0)
        {
            printf("没有该单词：%s\n",key);
        }
        else
        {
            printf("[%s]的解释为：%s\n", key, content);
        }
    }