使用'delete'运算符清除内存时出现'Debug Assertion Failed'错误

Question

我已经尝试了一切,但代码不起作用,我无法理解为什么.

我有两节课.这是基类:

class Vegetables
{
    private:
        char *nameStr;
        char *countrySrc;
        int seasonRd;
    public:
        Vegetables()
        {
            cout << "Default constructor for Vegetables" << endl;
            nameStr = new char[20];
            nameStr = "Unknown";
            countrySrc = new char[20];
            countrySrc = "Unknown";
            seasonRd = -1;
        }

        virtual ~Vegetables()
        {
            delete[]nameStr; //Here happens the error (_crtisvalidheappointer(block))
            delete[]countrySrc;
            cout << "Destructor for Vegetables" << endl;
        }
};

它继承了类'Inherited Unit':

class InhUnit : public Vegetables
{
    private:
        Delivery delivery_;
        Vegetables vegetables;
        int quantity;
        int price;
        int delivPrice;

    public:
        InhUnit() :Vegetables(),delivery_(OwnCosts), vegetables(), quantity(-1), price(-1), delivPrice(-1)
        {
            cout << "Default constructor for Inherited Unit" << endl;
        }

        ~InhUnit()
        {
            cout << "Destructor for Inherited Unit" << endl;
        }
};

出现此错误的原因可能是什么？

Answer 1

这不是你复制字符串的方式,strcpy而是使用

    Vegetables()
    {
        cout << "Default constructor for Vegetables" << endl;
        nameStr = new char[20];
        strcpy(nameStr, "Unknown");
        countrySrc = new char[20];
        strcpy(countrySrc, "Unknown");
        seasonRd = -1;
    }

你正在做的是分配一些内存并将其分配给指针.然后在下一行中,您指定指向字符串的指针,而不是将字符串复制到您已分配的内存中.

当你调用delete[]因为指针没有指向你分配的内存时,你得到了一个错误.