Question

我一直在使用主菜单来用于我的文字冒险游戏（我用它来学习，而不是发布它），但我遇到了很大的问题。主菜单有三个选项，播放，显示学分和终止程序。第二个选项，显示学分，需要从credits.txt中获取信息并在屏幕上发布，并在用户按下按钮后，将用户带回主菜单。主菜单是作为头文件（menu.h）构建的，主游戏是在test_project.cpp中。我将在这里给出完整的menu.h和.cpp的一部分，当然还有错误：

Menu.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

Test_project.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;

以下是错误：

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;
}

修改

用以下内容替换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

Answer 2

尝试将ifstream creditsFile("credits.txt");移到switch语句之前。

在C ++中包含来自.txt文件的文本的问题

2 个答案: