c++ - 在 C++ 中包含 .txt 文件中的文本以获得学分的问题

Question

我一直在为我的文字冒险游戏开发一个主菜单(我用它来学习，而不是发布它)，但我遇到了一个大问题。主菜单有播放、显示演职员表和终止程序三个选项。第二个选项，显示演职员表，需要从 credits.txt 中获取信息并将其发布在屏幕上，在用户按下按钮后，将用户带回主菜单。主菜单构建为头文件 (menu.h)，主游戏位于 test_project.cpp 中。我将在这里给出完整的 menu.h 和一部分 .cpp，当然还有错误:

---

菜单.h:

#ifndef MENU_H

#define MENU_H

void displayMenu () {
    int menuItem;
    bool menuRunning = true;

    while ( menuRunning ) {
        cout << "Choose a menu item:\n";

        cout << "1. Play\n2. Credits\n3. Exit\n";
        cin >> menuItem;

        switch ( menuItem ) {
            case 1:
                menuRunning = false;
                break;
            case 2:
                ifstream creditsFile("credits.txt");
                while ( !creditsFile.eof() )
                {
                    string readLine;
                    getline(creditsFile, readLine);
                    cout << readLine;                               
                }

                creditsFile.close();
                break;
            case 3:
                menuRunning = false;
                exit(0);
            default:
                cout << "";
        }

        cout << "\n---\n";
    }
}

#endif

---

测试项目.cpp:

#include <iostream>
#include <fstream>
#include <string>
#include <windows.h>

using namespace std;

#include "menu.h"

int main()
{
    displayMenu(); // This is where the functions from menu.h must be loaded, before the actual game starts.

    system("TITLE Title of the program comes here");

    // This is where the game starts, which loads when the user presses 1.
    int ab, cd;

---

这里是错误:

menu.h: In function `void displayMenu()':
In file included from test_project.cpp:11:
menu.h:29: error: jump to case label
menu.h:20: error:   crosses initialization of `std::ifstream creditsFile'
menu.h:32: error: jump to case label
menu.h:20: error:   crosses initialization of `std::ifstream creditsFile'
menu.h:29: warning: destructor needed for `creditsFile'
menu.h:29: warning: where case label appears here
menu.h:29: warning: (enclose actions of previous case statements requiring destructors in their own scope.)
menu.h:32: warning: destructor needed for `creditsFile'
menu.h:32: warning: where case label appears here
In file included from test_project.cpp:11:
menu.h:40:7: warning: no newline at end of file

Answer 1

尝试将案例 2 重写为:

case 2:{
    ifstream creditsFile("credits.txt");
    while ( !creditsFile.eof() ){
        string readLine;
        getline(creditsFile, readLine);
        cout << readLine;                               
    }
    creditsFile.close();
    break;
}

编辑

用这个替换 Menu.h 的内容:

#ifndef MENU_H
#define MENU_H

void displayMenu () {
    int menuItem;
    bool menuRunning = true;

    while ( menuRunning ) {
        cout << "Choose a menu item:\n";
        cout << "1. Play\n2. Credits\n3. Exit\n";
        cin >> menuItem;
        switch ( menuItem ) {
            case 1:{
                menuRunning = false;
                break;
            }
            case 2:{
                ifstream creditsFile("credits.txt");
                while ( !creditsFile.eof() ){
                    string readLine;
                    getline(creditsFile, readLine);
                    cout << readLine;                               
                }
                creditsFile.close();
                break;
            }
            case 3:{
                menuRunning = false;
                exit(0);
            }
            default:
                cout << "";
        }
        cout << "\n---\n";
    }
}
#endif