加载和保存矢量到文件

Question

我正在使用C ++ Builder，我有一个Appointment对象的向量数组。

我想将其保存到文件并加载它。

目前，我使用ifstream和ofstream与二进制文件。我有一个标题，其中包含将与数据一起保存的向量大小，以便在加载时知道其大小。

灭菌是一种更好的方法吗？

如果是这样，我是否需要使用升级库或其他方式？

这是我目前的代码：

class appointment
{
public:
    appointment();
    appointment(TDateTime aDate, TDateTime aReminderDateTime, string aType,
    string aLocation, string aComments, bool aIsImportant)
    {
        appDateTime = aDate;
        appReminderDateTime = aReminderDateTime;
        appType = aType;
        appLocation = aLocation;
        appComments = aComments;
        appIsImportant = aIsImportant;
    }
    void setAppDateTime(TDateTime aDateTime)
    {
        appDateTime = aDateTime;
    }
    void setappReminderDateTime(TDateTime aReminderDateTime)
    {
        appReminderDateTime = aReminderDateTime;
    }
    /*
    void printAppointmentDetails()
    {
        cout << "Appointment Date: " << appDateTime << endl;
        cout << "Appointment Reminder Date: " << appReminderDateTime << endl;
        cout << "Appointment Type: " << appType << endl;
        cout << "Appointment Location: " << appLocation << endl;
        cout << "Appointment Comments: " << appComments << endl;
        if (appIsImportant)
        {
            cout << "Appointment IsImportant: " << "Yes" << endl;
        } else {
            cout << "Appointment IsImportant: " << "No" << endl;
        }
    }

    */
    void setType(string aType)
    {
        appType = aType;
    }
    void setLocation(string aLocation)
    {
        appLocation = aLocation;
    }
    void setComments(string aComments)
    {
        appComments = aComments;
    }
    void setIsImportant(bool aIsImportant)
    {
        appIsImportant = aIsImportant;
    }
    TDateTime getAppDateTime()
    {
        return appDateTime;
    }
    TDateTime getAppReminderDateTime()
    {
        return appReminderDateTime;
    }
    string getType()
    {
        return appType;
    }
    string getLocation()
    {
        return appLocation;
    }
    string getComments()
    {
        return appComments;
    }
    bool getIsImportant()
    {
        return appIsImportant;
    }
private:
    //appointment();
    TDateTime appDateTime;
    TDateTime appReminderDateTime;
    string appType;
    string appLocation;
    string appComments;
    bool appIsImportant;
    //person owner;
};

class calendar
{
public:
    calendar()
    {
        //loadFromFile();
        //load persons
        //calculateimportantAppointments
    }
    ~calendar()
    {
        saveToFile();
    }
    //addperson
    //editperson
    //removeperson
    void createAppointment(TDateTime aDate, TDateTime aReminderDateTime, string aType,
    string aLocation, string aComments, bool aIsImportant)
    {
        appointment newAppointment(aDate, aReminderDateTime, aType,
        aLocation, aComments, aIsImportant);
        appointments.push_back(newAppointment);
    }
    /*
    void printAllAppointmentDetails()
    {
        for (int i = 0; i < appointments.size(); i++)
        {
            appointments[i].printAppointmentDetails();
        }
    }
    void calculateImportantAppointments()
    {

    }
    int getNumberOfImportantAppointments()
    {
        int intImportantAppointmentCount = 0;
        for (int i = 0; i < appointments.size(); i++)
        {
             if (appointments[i].getIsImportant())
                intImportantAppointmentCount += 1;
        }
        return intImportantAppointmentCount;
    }

    appointment[] getImportantAppointments()
    {

    }
    appointment[] getAllAppointments()
    {

    }
    */
    void loadFromFile()
    {
        ifstream iStream("file.ext", ios::binary);
        if (!iStream)
        {
            cout << "No file";
        } else {
            fileHeader_t fHeader;
            iStream.read((char*)&fHeader, sizeof(fileHeader_t));
            if (fHeader.magicNumber = 0xDEADBEAF)
            {
                appointments.resize(fHeader.appointmentCount);
                iStream.read((char*)&appointments[0], fHeader.appointmentCount * sizeof(appointment));
            }
        }
    }
    void saveToFile()
    {
        ofstream oStream("file.ext", ios::binary);
        fileHeader_t fHeader;
        fHeader.magicNumber = 0xDEADBEAF;
        fHeader.appointmentCount = appointments.size();
        oStream.write((char*)&fHeader, sizeof(fileHeader_t));
        oStream.write((char*)&appointments[0], sizeof(appointment) * appointments.size());
    }
    //vector<appointment> appointments;
private:
    vector<appointment> appointments;
    string calCurrentDate;
    string calCurrentTime;
    typedef struct fileHeader_s
    {
        DWORD magicNumber;
        size_t appointmentCount;
    }fileHeader_t;
};

调用loadFromFile（）方法时，我遇到了以下错误。

[BCC32警告] File1.cpp（185）：W8060可能不正确的分配[ILINK32错误]错误：未解析的外部'预约::约会（）'引自 PROFILES.SOIT.LOCAL HOMES $ SIMON.CANNING MY DOCUMENTS RAD STUDIO PROJECTS DEBUG FILE1.OBJ [ILINK32错误]错误：无法执行链接

我知道这是因为构造函数调用而发生的。我可以就如何解决这个问题提出一些建议吗？

Answer 1

另一答案