[将新的原始数据添加到文件后，数组将被丢弃С++ Visual Studio

Question

我正在尝试使用结构，动态数组和文件来解决任务。所以我[]

1. 创建动态数组-Unit* array_of_employees = new Unit[number_of_employees];
2. 生成数组-generateEmployees(Unit* array_of_employees, int& number_of_employees);
3. 将数据写入文件-writeFileEmployees(Unit* array_of_employees, int number_of_employees);
4. 在控制台中显示数组的元素-readAllEmployeeData(Unit* array_of_employees, int number_of_employees);

到那时为止，它一直在正常工作。然后我是

1. 通过创建内存大小为+1的新数组来重新分配数组的内存-Unit* getRememberForArrayOfEmployees(Unit* array_of_employees, int& number_of_employees, int new_number_of_employees);
2. 在数组末尾添加新注释
3. 在文件末尾写入-void writeEndFileEmployees(Unit new_epmloyee);

然后，我试图在控制台中显示数组，但是数组中有垃圾。需要您的帮助

#include <conio.h>
#include <string>
#include <iostream>
#include <fstream>
#include <cstdlib>
using namespace std;

struct Unit
{
    string fullName;
    string department;
    string position;
    int monthSalary;
};

const string FILE_OF_EMPLOYEES = "employee.txt"; //file_path

int getCountOfEmployees(string FILE_OF_EMPLOYEES);
void generateEmployees(Unit* array_of_employees, int& number_of_employees);
void writeFileEmployees(Unit* array_of_employees, int number_of_employees);
void writeEndFileEmployees(Unit new_epmloyee);
void readAllEmployeeData(Unit* array_of_employees, int number_of_employees);
void addNewEmployeeData(Unit* array_of_employees, int& number_of_employees);
Unit* getRememberForArrayOfEmployees(Unit* array_of_employees, int& number_of_employees, int new_number_of_employees);

int main()
{
    setlocale(LC_ALL, "rus");

    int number_of_employees = getCountOfEmployees(FILE_OF_EMPLOYEES);
    Unit* array_of_employees = new Unit[number_of_employees];

    generateEmployees(array_of_employees, number_of_employees);
    writeFileEmployees(array_of_employees, number_of_employees);
    readAllEmployeeData(array_of_employees, number_of_employees);
    addNewEmployeeData(array_of_employees, number_of_employees);

    //From this place there is trash in the array_of_employees :(

    readAllEmployeeData(array_of_employees, number_of_employees);

    delete[]array_of_employees;
    system("pause");
    return 0;
}


//Define amount of structures in the file
int getCountOfEmployees(string FILE_OF_EMPLOYEES)
{
    //Open and move a cursor in the end of the file
    ifstream file(FILE_OF_EMPLOYEES, ios::in);
    int number_of_strings = 0;
    if (file.is_open())
    {
        string buffer;
        while (getline(file, buffer))
            number_of_strings++;
    }
    file.close();
    return number_of_strings;
}

void generateEmployees(Unit* array_of_employees, int& number_of_employees)
{
    number_of_employees = 1;

    array_of_employees[0].fullName = "Ivanov";
    array_of_employees[0].department = "QA1";
    array_of_employees[0].position = "QA";
    array_of_employees[0].monthSalary = 1000;
}

void writeFileEmployees(Unit* array_of_employees, int number_of_employees)
{
    ofstream fout(FILE_OF_EMPLOYEES, ios::out);
    for (int i = 0; i < number_of_employees; i++)
    {
        fout << array_of_employees[i].fullName << " "
            << array_of_employees[i].department << " "
            << array_of_employees[i].position << " "
            << array_of_employees[i].monthSalary;
        if (i < number_of_employees - 1) fout << endl;
    }
    fout.close();
}

void writeEndFileEmployees(Unit new_employee)
{
    ofstream fadd(FILE_OF_EMPLOYEES, ios::app);
    fadd << endl;
    fadd << new_employee.fullName << " "
        << new_employee.department << " "
        << new_employee.position << " "
        << new_employee.monthSalary;
    fadd.close();
    cout << "New employee added" << endl;
}

void readAllEmployeeData(Unit* array_of_employees, int number_of_employees)
{
    //system("cls");
    cout << "  Users accounts\n"
        << " ------------------------------- \n"
        << "|Full Name"
        << "\t|Department"
        << "\t|Position"
        << "\t|Monthly Salary\t|\n"
        << "\n ------------------------------- \n";
    for (int i = 0; i < number_of_employees; i++)
    {
        cout << "|" << array_of_employees[i].fullName << " "
            << "\t|" << array_of_employees[i].department << "\t"
            << "\t|" << array_of_employees[i].position << "\t"
            << "\t|" << array_of_employees[i].monthSalary << "\t|"
            << endl;
    }
    cout << " ------------------------------- " << endl;
}

void addNewEmployeeData(Unit* array_of_employees, int& number_of_employees)
{
    //system("cls");
    array_of_employees = getRememberForArrayOfEmployees(array_of_employees, number_of_employees, number_of_employees + 1);
    cout << "Add new user profile\n" << endl;
    cout << "Full Name: ";
    cin >> array_of_employees[number_of_employees - 1].fullName;
    cout << "Department: ";
    cin >> array_of_employees[number_of_employees - 1].department;
    cout << "Position: ";
    cin >> array_of_employees[number_of_employees - 1].position;
    cout << "Monthly salary: ";
    cin >> array_of_employees[number_of_employees - 1].monthSalary;

    writeEndFileEmployees(array_of_employees[number_of_employees - 1]);

}

Unit* getRememberForArrayOfEmployees(Unit* array_of_employees, int& number_of_employees, int new_number_of_employees)
{
    Unit* new_array_of_employees;
    if (number_of_employees < new_number_of_employees)
    {
        new_array_of_employees = new Unit[new_number_of_employees];
        for (int i = 0; i < number_of_employees; i++)
        {
            new_array_of_employees[i].fullName = array_of_employees[i].fullName;
            new_array_of_employees[i].department = array_of_employees[i].department;
            new_array_of_employees[i].position = array_of_employees[i].position;
            new_array_of_employees[i].monthSalary = array_of_employees[i].monthSalary;

        }
        for (int i = number_of_employees; i < new_number_of_employees; i++)
        {
            new_array_of_employees[i].fullName = " ";
            new_array_of_employees[i].department = " ";
            new_array_of_employees[i].position = " ";
            new_array_of_employees[i].monthSalary = 0;
        }
        delete[]array_of_employees;
        number_of_employees = new_number_of_employees;
        array_of_employees = new_array_of_employees;
    }
    return array_of_employees;
}

我正在尝试使用结构，动态数组和文件来解决任务。所以我要创建一个动态数组-Unit * array_of_employees = new Unit [number_of_employees];生成一个数组-generateEmployees（...

Answer 1

addNewEmployeeData（通过调用getRememberForArrayOfEmployees）可以删除现有的array_of_employees数据。您为此分配了一个新数组，但切勿将修改后的指针传递回调用方。