Question

伙计们，我在C ++领域还很陌生，这是我的学期项目。当我在堆栈上创建IPADDRESS对象时，main.cpp文件将运行，直到为IPADDRESS对象调用了解构成员为止。第一部分运行正常，第二部分返回相同的输出，只是存在细分错误。

// Main file
#include <bits/stdc++.h>
#include <stdio.h>
#include <stdlib.h>
#include <iostream>
#include <string>
#include "IPInfo.h"

using namespace std;

// Function declaration of display()
void displayInfo(IPADDRESS);

int main(){

    const char* address = "cbc.ca";
    const char* command = "nslookup ";

        char buf[256];
        strcpy(buf, command);
        strcat(buf, address);

        string* Info = new(nothrow) string[256]; // Allocate 256 bytes to this string
        *Info = system(buf); // Allocate the response from the command line to Info (which is on the heap)
    cout << Info << endl << *Info << endl << "===============================" << endl << endl;
    delete[] Info;

    IPADDRESS test("cbc.ca");

    displayInfo(test);

// Displays but never exits the program correctly

    return 0;
}
void displayInfo(IPADDRESS Website){

    string* displayBus;
    displayBus = Website.getInfo();
    cout << displayBus;
}

// Header file
#ifndef IPInfo_H
#define IPInfo_H

#include <bits/stdc++.h>
#include <string>
#include <iostream>

using namespace std;
class IPADDRESS{
private:
    const char* command = "nslookup ";
    string url;
    string info;
    string address;
    int searchFor(string locator); // Find a substring in the getInfo string

public:
    string* getInfo(); // Using the system("nslookup") call, get the info (Will be allocated to heap)
    IPADDRESS(string website);
    ~IPADDRESS();
    string getIPAddress(); // Using searchFor() get rid of unneeded characters and dump the IPAddress to a string
    string getName(); // Also output the name

};

IPADDRESS::IPADDRESS(string website){
    url = website;
}

IPADDRESS::~IPADDRESS(){
}
#endif

Answer 1

这是不正确的

deleted

您不能也不应该IPADDRESS::~IPADDRESS(){ delete &address; delete &url; delete &info; delete command; } delete以外的任何变量。

默认的编译器生成的析构函数在此处已足够且正确（您可以将其完全删除，在这种情况下将隐式生成）。

new

Answer 2

.et_pb_widget ul li { background-color: #f9f9f9; padding: 10px; } .et_pb_widget ul li:hover { background-color: #EEEEEE; color: #ff0000 !important; } .et_pb_widget > ul > li > a:hover { background-color: #EEEEEE; color: #ff0000 !important; } .et_pb_widget body:hover { color:#ff0000; }用于释放通过delete分配的内容，否则您不得使用它。

当前您发布的代码不包含new，因此析构函数应为：

new

还请注意，如果使用动态内存分配，则应遵循The Rule of Three。最好避免在C ++中进行裸露的动态内存分配。

调用析构函数时出现分段错误

2 个答案: