职工管理系统---读文件

//判断文件是否为空的标志
    bool m_FileIsempty;

    //文件不存在
    ifstream ifs;
    ifs.open(FILENAME, ios::in);//读文件
    if (!ifs.is_open()) {
        cout << "文件不存在" << endl;
        //初始化属性
        //初始化人数为零
        this->m_EmpNum = 0;
        //初始化数组指针
        this->m_EmpArray = NULL;
        //初始化文件是否为空
        this->m_FileIsempty = true;
        ifs.close();
        return;
    }

    //2.文件存在并且数据没有记录
    char ch;
    ifs >> ch;//读一个字符
    if (ifs.eof()) {
        //文件为空
        cout << "文件为空" << endl;
        //初始化属性
        //初始化人数为零
        this->m_EmpNum = 0;
        //初始化数组指针
        this->m_EmpArray = NULL;
        //初始化文件是否为空
        this->m_FileIsempty = true;
        ifs.close();
        return;
    }
    

    //统计人数
    int get_EmpNum();

int workManager::get_EmpNum() {
    ifstream ifs;
    ifs.open(FILENAME, ios::in);//打开文件
    int id;
    string name;
    int dId;
    int num = 0;
    while (ifs >> id && ifs >> name && ifs >> dId) {
        //统计人数变量
        num++;
    }
    return num;

}

    //三、文件存在且有数据
    int num = this->get_EmpNum();
    cout << "职工人数为：" << num << endl;
    this->m_EmpNum = num;

//初始化员工函数
void workManager::init_Emp() {
    ifstream ifs;
    ifs.open(FILENAME, ios::in);
    int id;
    string name;
    int dId;
    int index=0;
    while (ifs>>id&&ifs>>name&&ifs>>dId)
    {
        worker *worker = NULL;
        if (dId == 1)//普通职工
        {
            worker = new Employee(id, name, dId);
        }
        else if (dId == 2)//经理
        {
            worker = new Manager(id, name, dId);
        }
        else//老板
        {
            worker = new Boos(id, name, dId);
        }
        this->m_EmpArray[index]=worker;
        index++;
    }
    ifs.close();//关闭文件
}

    //三、文件存在且有数据
    int num = this->get_EmpNum(){
    cout<<"职工人数为：" << num << endl;
    this->m_EmpNum = num;
    void workManager::init_Emp() 

    }
    
    //开辟空间
    this->m_EmpArray = new worker*[this->m_EmpNum];
    for (int i = 0; i<this->m_EmpNum; i++) {
        cout << "职工编号：" << this->m_EmpArray[i]->m_id << "姓名："
            << this->m_EmpArray[i]->m_name <<
            "部门编号:" << this->m_EmpArray[i]->m_DeptId << endl;
    }