阅读文本文件并创建迷宫

我正在开发一个程序，该程序将读取一个包含迷宫信息的文件，并使用该信息找到穿过迷宫的路径。我遇到的问题是在数组中表示迷宫。我不知道如何将X转化为整数，将它们表示为数组中的墙。在单参数构造函数中，我使用for循环遍历文件，并将每个字符放入适当的数组索引中。我做这件事的方式显然不起作用，如果有人能就如何正确地表示阵列中的迷宫提供一些建议，我将不胜感激

   /**@file Maze.h*/
    #include <iostream>
    #include <string>
    #include <fstream>
    using namespace std;
    const int MAX_ROW = 60;
    const int MAX_COL = 40;
    const int WALL = 0;
    const int CLEAR = 1;
    const int PATH = 2;
    const int VISITED = 3;
    struct Position
    {
        int r;
        int c;
    };
    class Maze
    {
    public:
    Maze();
    /*One argument constructor that takes a filename and reads
     *the contents of a maze file.
     */
    Maze(string filename);
    void displayMaze();
    bool isWall(Position p);
    bool isPath(Position p);
    bool isClear(Position p);
    bool isVisited(Position p);
    void setWall(Position p);
    void setPath(Position p);
    void setClear(Position p);
    void setVisited(Position p);
    Position getEntrance();
    Position getExit();
    private:
        int row;
        int col;
        Position exit;
        Position entrance;
        int maze[MAX_ROW][MAX_COL];
    };
/**@file Maze.cpp*/
#include "Maze.h"
Maze::Maze()
{}
Maze::Maze(string filename)
{
    ifstream inStream;
    inStream.open(filename.c_str());
    if(inStream.fail())
{
    cout << "Input file opening failed.n";
}
//Get the dimensions of the maze.
inStream >> col >> row; 
//Get the exit to the maze.
inStream >> exit.r >> exit.c;
//Get the entrance to the maze.
inStream >> entrance.r >> entrance.c;
//Read maze from the file.
for(int r = 0; r < row; r++)
{   
    for(int c = 0; c < col; c++)
    {
        inStream >> maze[r][c];
        if(maze[r][c])== 'X')
            maze[r][c] = WALL;
        else
            maze[r][c] = CLEAR;
    }
}
}//end one argument constructor
void Maze::displayMaze()
{
cout << 't' << 't' << "Row" << 't' << "Column" << endl;
cout << "Dimensions:" << 't' << row << 't' << col << endl;
cout << "Exit:" << 't' << 't' << exit.r << 't' << exit.c << endl;
cout << "Entrance: " << 't' << entrance.r << 't' << entrance.c << endl;
for(int r = 0; r < row; r++)
{
    for(int c = 0; c < col; c++)
    {
        cout << maze[r][c];
    }
    cout << endl;
}
}//end displayMaze()
bool Maze::isWall(Position p)
{
return maze[p.r][p.c] == WALL;
}//end isWall()
bool Maze::isPath(Position p)
{
return maze[p.r][p.c] == PATH;
}//end isPath()
bool Maze::isClear(Position p)
{
return maze[p.r][p.c] == CLEAR;
}//end isClear()
bool Maze::isVisited(Position p)
{
return maze[p.r][p.c] == VISITED;
}//end isVisited()
void Maze::setWall(Position p)
{
maze[p.r][p.c] = WALL;
}//end setWall()
void Maze::setPath(Position p)
{
maze[p.r][p.c] = PATH;
}//end setPath()
void Maze::setClear(Position p)
{
maze[p.r][p.c] = CLEAR;
}//end setClear()
void Maze::setVisited(Position p)
{
maze[p.r][p.c] = VISITED;
}//end setVisited()
Position Maze::getEntrance()
{
return entrance;
}//end getEntrance()
Position Maze::getExit()
{
return exit;
}//end getExit()

下面是一个文件内容的示例。第一组数字是迷宫的大小，分为列和行。第二组数字是出口的行列位置，第三组数字是入口的行列位置。

20 7
0 18
6 12
xxxxxxxxxxxxxxxxxx x
x     x       xxxx x
x xxxxx xxxxx   xx x
x xxxxx xxxxxxx xx x
x x          xx xx x
x xxxxxxxxxx xx    x
xxxxxxxxxxxx xxxxxxx