Question

所以我试图创建一个模仿Minesweeper游戏的程序。我仔细检查了头文件，类名，并确保其他cpp文件中的头文件是#included，但是当我尝试构建程序时，我在＆＃34; Main＆＃34中出现了LNK2019错误;我上课了。

完整错误：

错误1错误LNK2019：未解析的外部符号＆＃34; public：__ thishisall 板::板（INT，INT，INT）＆＃34; （?? 0Board @@ QAE @ HHH @ Z）参考 function _main \ fpsb \ g \ gathmr26 \ visual studio 2013 \ Projects \ Minesweeper \ Minesweeper \ Main.obj Minesweeper

我花了大约2个小时在StackOverflow和其他地方查看答案并且无处可去。我已经在this MSDN page中的每一个子弹点，以及每一个＆＃34;共同的原因＆＃34;在this popular answer中，似乎没有一个适用于我的情况。我还尝试了所有的＆＃34;诊断工具＆＃34; MSDN页面上的选项以及他们所做的一切只会让我更加困惑。

我最接近我的情况（据我所知）是this question，除了我的所有代码都在一个项目中，而不是多个。回答这个问题的人之一已经说过＆＃34;我把这个代码输入我的Visual Studio并且工作得很好并且假设文件在一个项目中。我不明白为什么当我在这里遇到几乎相同的情况时，那个答案让它在那里工作。

所以，无论如何，这是代码：

Main.cpp的

#include <iostream>
#include <string>
#include "Cell.h"
#include "Board.h"

int main() {
    Board *bee;
    bee = new Board(50, 50, 50);

    std::cout << "board created";

    return 0;
}

Board.cpp

#include <iostream>
#include <string>
#include <ctime>
#include <cstdlib> 
using namespace std;
#include "Cell.h"
#include "Board.h"
#ifndef BOARD_H
#define BOARD_H

// Board class. Used to create an array of cell objects to function as data model for Minsweeper game.
class Board
{
private:
int width; // number of columns in board
int height; // number of rows in board
int mines; // number of mines stored in board
Cell*** cells; // array storing cell objects

public:

// Constructor for board. Takes number of columns, rows, and mines as parameters
Board::Board(int cols, int rows, int numMines) {
    width = cols;
    height = rows;
    mines = numMines;
    cells = new Cell**[height];
    for (int i = 0; i < height; i++) {
        cells[i] = new Cell*[width];
    }
    int c = 0;
    int r = 0;
    while (r < height)
    {
        while (c < width)
        {
            setCell(c, r, CellValue::COVERED_CELL);
            c++;
        }
        c = 0;
        r++;
    }
    int m = 0;
    while (m < numMines)
    {
        std::srand(std::time(nullptr));
        int x = generateRandomNumberInRange(0, width - 1);
        int y = generateRandomNumberInRange(0, height - 1);
        if (!(getCellVal(x, y) == MINE))
        {
            setCell(x, y, CellValue::MINE);
            m++;
        }
    }
}

    // Accessor for width field
int Board::getWidth()
{
    return width;
}

// Accessor for height field
int Board::getHeight()
{
    return height;
}

// Accessor for mines field
int Board::getMines()
{
    return mines;
}

// Function to access value of cell located in array where x is column parameter and y is row parameter
CellValue Board::getCellVal(int x, int y)
{
    CellValue value = CellValue::INVALID_CELL;

    if (!(x < 0 || x >(width - 1) || y < 0 || y >(height - 1)))
    {
        Cell temp = *cells[x][y];
        value = temp.getValue();
    }

    return value;
}

// Function to set value of cell located in array where x is column parameter and y is row parameter
void Board::setCell(int x, int y, CellValue value)
{
    if (!(x < 0 || x >(width - 1) || y < 0 || y >(height - 1)))
    {
        Cell temp = *cells[x][y];
        temp.setValue(value);
    }
}

// Function to determine if game is lost
// Loops through array to see if there are any UNCOVERED_MINES
// If so, returns true, game ends, as you've lost :(
// If not, returns false and game can continue
// Should run after every click action in game
bool Board::isGameLost()
{
    bool isLost = false;
    int c = 0;
    int r = 0;
    while (r < height)
    {
        while (c < width)
        {
            if (getCellVal(c, r) == UNCOVERED_MINE)
            {
                isLost = true;
            }
            c++;
        }
        c = 0;
        r++;
    }
    return isLost;
}

// Function to determine if game is won
// Loops through array to determine if there are any falsely flagged mines, unflagged mines, covered cells, or uncovered mines
// If there are, returns false and game continues
// If not, returns true, games ends, you've won :)
bool Board::isGameWon()
{
    bool isWon = true;
    int c = 0;
    int r = 0;
    while (r < height)
    {
        while (c < width)
        {
            CellValue value = getCellVal(c, r);
            if ((value == FLAG) ||
                (value == MINE) ||
                (value == COVERED_CELL) ||
                (value == UNCOVERED_MINE))
            {
                isWon = false;
            }
            c++;
        }
        c = 0;
        r++;
    }
    return isWon;
}

};


#endif

Board.h

#include <iostream>
#include <string>
#include "Cell.h"
#ifndef BOARD_H
#define BOARD_H

class Cell;
enum CellValue;

class Board 
{
private: 
    int width;
    int height;
    int mines;
    Cell*** cells;

public:
    Board(int cols, int rows, int numMines);
    int getWidth();
    int getHeight();
    int getMines();
    CellValue* getCellVal(int x, int y);
    void setCell(int x, int y, CellValue value);
    void uncoverCell(int x, int y);
    void flagCell(int x, int y);
    bool isGameLost();
    bool isGameWon();
};

#endif

我知道这是人们常见的错误，并且StackOverflow上有一些关于此问题的问题，但在这一点上，我还没有找到任何与我相似的内容。在这里这是什么问题？

Answer 1

好像你在混合标题和源文件。您的cpp文件包含Board::Board(...) { ... } bool Board::IsGameWon...声明，其中包含所有已定义的函数。这不是cpp文件的样子。它应该只包含函数声明：

for (String employee: employeeSet)
 {
    System.out.println(this.employeeSet.getFirstName());
 }

等...

同一项目中两个类之间的c ++ LNK2019错误

1 个答案: