Question

_curLevel.size（）是我在类级别创建的私有向量，每当我尝试在getPosition函数中运行.size（）函数时，它返回0。但是在其他函数中，此命令运行良好并返回13。因此，我的for循环无法正常工作。我也复制了main.cpp和level.h。

level.cpp

bool level::loadGame(string file_name){
    string line;
    load.open(file_name);
    if (load.fail()){
        cout << "Failed to Load Saved Game" << endl;
        return false;
    }else{
        while ((getline(load, line))){
            _curLevel.push_back(line);
        }
        cout << _curLevel.size() << endl;
        return true;
    }
}
int level::getPosition(char object,char coor){
    char a;
    cout << _curLevel.size() << endl;
    for (unsigned int y = 0; y < (_curLevel.size()); y++){
        for (unsigned int x = 0; x < (_curLevel[y].size()); x++){
            a = _curLevel[y][x];
            if (object == a){
                switch (coor){
                case 'x':
                    return x;
                case 'y':
                    return y;
                default:
                    return 1;
                }
            }
        }
    }
    return 1;
}

void level::printLevel(){
    for (unsigned int i = 0; i < (_curLevel.size()); i++){
        cout << _curLevel[i] << endl;
    }
    cout << _curLevel.size() << endl;
}

level.h

#pragma once
#include <string>
#include <fstream>
#include <vector>

using namespace std;

class level
{
public:
    level();
    bool loadGame(string file_name);
    int getPosition(char object, char coor);
    /*void saveGame(string file_name);*/
    void printLevel();
    void initLevel();
private:
    vector <string> _curLevel;
    ifstream load;
    ofstream save;
};

main.cpp

#include <iostream>
#include "level.h"
#include "player.h"

using namespace std;

int main(){
    level level;
    level.loadGame("ha.txt");
    level.printLevel();
    player player;

    system("pause");
    return 0;
}

player.cpp

#include "player.h"
#include "global.h"
#include <iostream>
#include "level.h"

using namespace std;

player::player()
{
    level level;
    _playeryCoor = level.getPosition(playersymbol,'y');
    _playerxCoor = level.getPosition(playersymbol,'x');
    cout << _playeryCoor << endl;
    cout << _playerxCoor << endl;
    cout << "e";
}

player.h

#pragma once
#include "level.h"
#include <iostream>

class player
{
public:
    player();
private:
    int _playeryCoor;
    int _playerxCoor;
};

global.h

namespace
{
    char playersymbol = '@';
}

ha.txt

####################################
#..................................#
#..................................#
#..................................#
#..................................#
#...............@..................#
#..................................#
#..................................#
#..................................#
#..................................#
#..................................#
#..................................#
####################################

Answer 1

错误在于添加的player代码中：您在level的构造函数中声明了本地player。该本地vector中的level未填充，因此其大小为零。

一种可行的解决方案是将全局level作为参数传递给player的构造函数。

myvector.size（）在唯一函数中返回0

1 个答案: