编一个通过屏幕选择命令的文件管理系统，每屏要为用户提供足够的选择信息，不需要打入冗长的命令。

题目要求：

编一个通过屏幕选择命令的文件管理系统，每屏要为用户提供足够的选择信息，不需要打入冗长的命令。

代码：

#include <iostream>
#include <string>
#include <conio.h>

using namespace std;

struct UFD //用户目录文件
{
    string File_Name; //文件名
    bool R,W,X; // 读写执行
    int Len_File; //文件大小
};

struct MFD //主文件夹目录
{
    string User_Name; //用户名
    UFD * Pointer; //用户文件目录指针
};

struct AFD //运行文件目录
{
    int File_ID;// 文件号
    bool R, W, X;
    int Pointer;//读写指针
};

class FILE_SYSTEM
{
public:
    void Inital();
    void Start();
private:
    int Num_User; //用户数量
    int Num_File; //每个用户可保存的文件数
    int MAX_Open_File; //打开的最大文件数

    MFD * Mfd; // 主文件目录
    UFD * Ufd; // 用户文件目录
    AFD * Afd; //运行文件目录
};

int main()
{
    FILE_SYSTEM FS;
    FS.Inital();
    FS.Start();
    return 0;
}

void FILE_SYSTEM::Inital()
{
    Num_File = 10;
    Num_User = 10;
    MAX_Open_File = 5;

    //UFD
    Ufd = new UFD[Num_User*Num_File];
    //MFD
    Mfd = new MFD[Num_User];
    for(int i = 0 ; i < Num_User; i++)
    {
        Mfd[i].Pointer = &(Ufd[i*Num_File]);
    }
    //AFD
    Afd = new AFD[MAX_Open_File];

    Mfd[0].User_Name="wzn";
    Ufd[0].File_Name="1.txt";
    Ufd[0].Len_File=10;
    Ufd[0].R=true;
    Ufd[0].W=false;
    Ufd[0].X =false;

    Ufd[1].File_Name="2.txt";
    Ufd[1].Len_File=15;
    Ufd[1].R=false;
    Ufd[1].W=false;
    Ufd[1].X =true;

    for(int i = 2; i < Num_File; i++) //其他人没有文件存在
    {
        Ufd[i].File_Name="";
        Ufd[i].Len_File=-1;
        Ufd[i].R=false;
        Ufd[i].W=false;
        Ufd[i].X =false;
    }
}

void showOrder()
{
    cout << "Order list" << endl;
    cout << "	1. dir	";
    cout << "	2. diropen" << endl;
    cout << "	3. create";
    cout << "	4. delete" << endl;
    cout << "	5. open	";
    cout << "	6. logout" << endl;
    cout << "	7. close";
    cout << "	8. read" << endl;
    cout << "	9. write	";
    cout << "	10. shutdown" << endl;
}

void FILE_SYSTEM::Start()
{
    showOrder();
    int User_ID,i;
    int Num_Open_File,tmp_len; //当前用户打开文件数
    string User_Name,tmp;//当前登录的用户名
    int cmd; //用户输入命令
    UFD * ufd;
    char choice;


    do  //打开计算机
    {
        do
        {
            cout << "User Name:";
            cin >> User_Name;
            for(User_ID = 0; User_ID < Num_User; User_ID++)
            {
                if(Mfd[User_ID].User_Name == User_Name)
                    break;
            }
            if(User_ID == Num_User)
                cout << "No such User name,please try again!" << endl;
        }
        while(User_ID == Num_User);

        cout << "Welcome to login, " << User_Name << "!" << endl;
        ufd = Mfd[User_ID].Pointer;

        //初始化文件列表
        for(i = 0 ; i < MAX_Open_File; i++)
        {
            Afd[i].File_ID = -1;
        }
        Num_Open_File = 0;

        do //命令处理
        {
            //模拟命令行：
            cout << "["<<User_Name<<"]~";
            cin >> cmd;

            if(cmd == 1)
            {
                cout << endl;
                cout << "Owner of Files:" << User_Name << endl;
                cout << "	State	Length	FileName" << endl;
                for(i = 0 ; i < Num_File; i++)
                {
                    if(ufd[i].Len_File != -1)
                    {
                        cout << "	";
                        if(ufd[i].R == true)cout << "R";
                        else cout << "-";
                        if(ufd[i].W == true)cout << "W";
                        else cout << "-";
                        if(ufd[i].X == true)cout << "X";
                        else cout << "-";
                        cout << "	";
                        cout << ufd[i].Len_File << "	";
                        cout << ufd[i].File_Name << endl;
                    }
                }
                cout << endl;
            }
            else if(cmd == 2)
            {
                cout << endl;
                cout << "Opened Files of " << User_Name << endl;
                cout << "	" << "State	" << "Open File name" << endl;

                for(i = 0 ; i < MAX_Open_File; i++)
                {
                    if(Afd[i].File_ID != -1)
                    {
                        cout << "	";
                        if(Afd[i].R == true)cout << "R";
                        else cout << "-";
                        if(Afd[i].W == true)cout << "W";
                        else cout << "-";
                        if(Afd[i].X == true)cout << "X";
                        else cout << "-";
                        cout << "	";
                        cout << ufd[Afd[i].File_ID].File_Name << endl;
                    }
                }
                cout << endl;
            }
            else if(cmd == 3)
            {
                for(i=0; i<Num_File; i++)
                {
                    if(ufd[i].Len_File == -1)
                        break;
                }
                if(i == Num_File)
                {
                    cout << "No Enough space!" << endl;
                }
                else
                {
                    cout << "File's Information:" << endl;
                    cout << "File 's name:";
                    cin >> tmp;
                    ufd[i].File_Name = tmp;

                    cout << "Read(y/n):";
                    choice = getch();
                    if(choice == 'y')ufd[i].R = true;
                    else ufd[i].R = false;
                    cout << endl;

                    cout << "Write(y/n):";
                    choice = getch();
                    if(choice == 'y')ufd[i].W = true;
                    else ufd[i].W = false;
                    cout << endl;

                    cout << "Execute(y/n):";
                    choice = getch();
                    if(choice == 'y')ufd[i].X = true;
                    else ufd[i].X = false;
                    cout << endl;

                    cout << "Length:";
                    cin >> tmp_len;
                    if(tmp_len > 0)
                        ufd[i].Len_File = tmp_len;
                    cout << "New File: " << ufd[i].File_Name << " is Created" << endl;
                }
            }
            else if(cmd == 4)
            {
                cout << "Enter Delete file name:";
                cin >> tmp;
                for(i = 0 ; i < Num_File; i++)
                {
                    if((ufd[i].Len_File != -1) && (ufd[i].File_Name == tmp))
                        break;
                }
                if(i == Num_File)
                {
                    cout << "NOT FOUND!" << endl;
                }
                else
                {
                    ufd[i].Len_File = -1; //delete the file
                    cout << "The File:" << ufd[i].File_Name << " is deleted!" << endl;
                }
            }
            else if(cmd == 5)
            {
                if(Num_Open_File == MAX_Open_File)
                    cout << "Can't Open anymore!" << endl;
                else
                {
                    cout << "Open file 's name:";
                    cin >> tmp;
                    for(i=0; i <Num_File; i++)
                    {
                        if((ufd[i].Len_File != -1)&& (ufd[i].File_Name == tmp))
                            break;
                    }
                    if(i == Num_File)
                    {
                        cout << "No such file" << endl;
                    }
                    else
                    {
                        int t;
                        Num_Open_File++;
                        for(t = 0; t < MAX_Open_File; i++)
                            if(Afd[t].File_ID == -1)
                                break;
                        Afd[t].File_ID = i;
                        Afd[t].Pointer = 0;//0
                        cout << "Open mode:" << endl;
                        if(ufd[i].R == 1)
                        {
                            cout << "Read(y/n):";
                            choice = getch();
                            if(choice == 'y')Afd[t].R = 1;
                            else Afd[t].R = 0;
                        }
                        else Afd[t].R = 0;

                        if(ufd[i].W == 1)
                        {
                            cout << "Write(y/n):";
                            choice = getch();
                            if(choice == 'y')Afd[t].W = 1;
                            else Afd[t].W = 0;
                        }
                        else Afd[t].W = 0;

                        if(ufd[i].X == 1)
                        {
                            cout << "Execute(y/n):";
                            choice = getch();
                            if(choice == 'y')Afd[t].X = 1;
                            else Afd[t].X = 0;
                        }
                        else Afd[t].X = 0;

                        cout << "The File:" << tmp << " is opened" << endl;
                    }
                }
            }
            else if(cmd == 6)
            {
                cout << "bye~" << User_Name << endl;
                break;
            }
            else if(cmd == 7)
            {
                cout << "Close File name:";
                cin >> tmp;
                for(i = 0 ; i < Num_File ; i++)
                {
                    if((ufd[i].Len_File != -1) && (ufd[i].File_Name == tmp))
                        break;
                }
                if(i == Num_File)
                {
                    cout << "Not found！" << endl;
                }
                else
                {
                    int t;
                    for(t = 0 ; t < MAX_Open_File ; t++)
                    {
                        if(Afd[t].File_ID == i)
                            break;
                    }
                    if(t == MAX_Open_File)
                        cout << "Not found" << endl;
                    else
                    {
                        Afd[t].File_ID = -1;
                        Num_Open_File--;
                        cout << tmp << " is closed" << endl;
                    }
                }
            }
            else if(cmd == 8)
            {
                cout << "Read file Name:";
                cin >> tmp;
                for(i = 0 ; i < Num_File; i++)
                {
                    if(ufd[i].File_Name == tmp && ufd[i].Len_File != -1)
                        break;
                }
                if(i == Num_File)
                {
                    cout << "Not Found" << endl;
                }
                else
                {
                    int t;
                    for(t = 0 ; t < MAX_Open_File; t++)
                    {
                        if(Afd[t].File_ID == i)
                            break;
                    }
                    if(t == MAX_Open_File)
                        cout << "No Enough Space" << endl;
                    else
                    {
                        if(Afd[t].R == true)
                        {
                            cout << "You can read this file" << endl;
                        }
                        else
                        {
                            cout << "Error:Not have Power of Open" << endl;
                        }
                    }
                }
            }
            else if(cmd == 9)
            {
                cout << "enter write file name:";
                cin >> tmp;
                for(i = 0 ; i < Num_File ; i++)
                    if(ufd[i].Len_File!=-1&&ufd[i].File_Name==tmp)
                        break;
                if(i == Num_File)
                {
                    cout << "No such file" << endl;
                }
                else
                {
                    int t;
                    for(t = 0 ; t < MAX_Open_File; t++)
                    {
                        if(Afd[t].File_ID == i)
                            break;
                    }
                    if(t == MAX_Open_File)
                    {
                        cout << "The file:" << tmp << "is not open" <<endl;
                    }
                    else
                    {
                        if(Afd[t].W == true)
                            cout << "You can write this file" << endl;
                        else
                            cout << "Error:Not have Power of write" << endl;
                    }
                }
            }
            else if(cmd == 10)
            {
                cout << "loging out ...." << endl;
                cout << "bye~" << User_Name << endl;
                cout << "Shutting down ..." << endl;
                break;
            }
            else
            {
                cout << "Illegal command, please try again" << endl;
            }
        }
        while(cmd != 10 && cmd != 6);
    }
    while(cmd != 10);
}