我正在尝试使用 c++ 和 SMFL 2.0 创建游戏，但我无法通过此错误，这让我发疯。我一直在互联网上阅读，似乎它可能是由于忘记包含而引起的，但我仍然看不出我哪里出错了。我已将 SMFL 2.0 库包含在 c++ -> 常规 -> 附加包含目录和链接器 -> 常规 -> 附加库目录下的项目属性部分中。
我完全空白，这是我收到的错误消息：
1>------ Build started: Project: Pang, Configuration: Debug Win32 ------
1> Game.cpp
1> Generating Code...
1> Skipping... (no relevant changes detected)
1> Pang.cpp
1>Game.obj : warning LNK4075: ignoring '/EDITANDCONTINUE' due to '/INCREMENTAL:NO' specification
1>Game.obj : error LNK2001: unresolved external symbol "private: static class PlayerPaddle Game::_player1" (?_player1@Game@@0VPlayerPaddle@@A)
1>C:\Users\Alexander\Desktop\C++\Projects\Pang\Debug\Pang.exe : fatal error LNK1120: 1 unresolved externals
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========
当我环顾代码时，Microsoft Visual C++ 没有显示任何带有红色下划线的语法错误，因此看起来语法没问题。以下是相关的代码行：
我的大部分一般都包括在这里：
标准数据文件
#pragma once
#include "targetver.h"
#include <stdio.h>
#include <tchar.h>
#include <windows.h>
#include <SFML/System.hpp>
#include <SFML/Graphics.hpp>
#include <SFML/Window.hpp>
#include <SFML/Audio.hpp>
#include <map>
#include <iostream>
#include <cassert>
#include <list>
可见游戏对象.h
#pragma once
class VisibleGameObject {
public:
VisibleGameObject();
virtual ~VisibleGameObject();
virtual void Load(std::string filename);
virtual void Draw(sf::RenderWindow &window);
virtual void SetPosition(float x, float y);
private:
sf::Sprite _sprite;
sf::Texture _image;
std::string _filename;
bool _isLoaded;
};
可见游戏对象.cpp
#include "stdafx.h"
#include "VisibleGameObject.h"
VisibleGameObject::VisibleGameObject() {
_isLoaded = false;
}
VisibleGameObject::~VisibleGameObject() {
}
void VisibleGameObject::Load(std::string filename) {
if (_image.loadFromFile(filename) == false) {
_filename = "";
_isLoaded = false;
}
else {
_filename = filename;
_sprite.setTexture(_image);
}
}
void VisibleGameObject::Draw(sf::RenderWindow &renderWindow) {
if (_isLoaded) {
renderWindow.draw(_sprite);
}
}
void VisibleGameObject::SetPosition(float x, float y) {
if (_isLoaded) {
_sprite.setPosition(x,y);
}
}
这个类帮助我使用 SMFL 库在渲染窗口上绘制图像。
PlayerPaddle.h
#pragma once
#include "VisibleGameObject.h"
class PlayerPaddle : public VisibleGameObject {
public:
PlayerPaddle();
~PlayerPaddle();
};
PlayerPaddle.cpp
#include "stdafx.h"
#include "VisibleGameObject.h"
#include "PlayerPaddle.h"
PlayerPaddle::PlayerPaddle() {
}
PlayerPaddle::~PlayerPaddle() {
}
游戏.h
#pragma once
#include "PlayerPaddle.h"
class Game {
public:
static void Start();
private:
static bool IsExiting();
static void GameLoop();
static void ShowSplashScreen();
static void ShowMenu();
enum GameState { Uninitialized, ShowingSplash, Paused, ShowingMenu, Playing, Exiting };
static GameState _gameState;
static sf::RenderWindow _mainWindow;
static PlayerPaddle _player1;
};
游戏.cpp
#include "stdafx.h"
#include "Game.h"
#include "SplashScreen.h"
#include "MainMenu.h"
void Game::Start(void) {
if(_gameState != Uninitialized) {
return;
}
_mainWindow.create(sf::VideoMode(1024,768,32),"Pang!");
//_player1.Load("images/paddle.png");
//_player1.SetPosition((1024/2)-45, 700);
_gameState = Game::ShowingSplash;
while(!IsExiting()) {
GameLoop();
}
_mainWindow.close();
}
bool Game::IsExiting() {
if(_gameState == Game::Exiting) {
return true;
}
else {
return false;
}
}
void Game::GameLoop() {
switch(_gameState) {
case Game::ShowingMenu: {
ShowMenu();
break;
}
case Game::ShowingSplash: {
ShowSplashScreen();
break;
}
case Game::Playing: {
sf::Event currentEvent;
while (_mainWindow.pollEvent(currentEvent)) {
_mainWindow.clear(sf::Color(0,0,0));
//_player1.Draw(_mainWindow);
_mainWindow.display();
if (currentEvent.type == sf::Event::Closed) {
_gameState = Game::Exiting;
}
if (currentEvent.type == sf::Event::KeyPressed) {
return;
if(currentEvent.key.code == sf::Keyboard::Escape) {
ShowMenu();
}
}
}
break;
}
}
}
void Game::ShowSplashScreen() {
SplashScreen splashScreen;
splashScreen.Show(_mainWindow);
_gameState = Game::ShowingMenu;
}
void Game::ShowMenu() {
MainMenu mainMenu;
MainMenu::MenuResult result = mainMenu.Show(_mainWindow);
switch(result) {
case MainMenu::Exit: {
_gameState = Game::Exiting;
break;
}
case MainMenu::Play: {
_gameState = Game::Playing;
break;
}
}
}
Game::GameState Game::_gameState = Uninitialized;
sf::RenderWindow Game::_mainWindow;
此代码仅在 Game.cpp 中以 _player1 开头的 3 行代码被注释掉时编译和运行。当没有被注释掉时，我得到了这个 LNK2001 错误，我就是无法通过这个，这非常令人沮丧。
如果有人对这里可能出现的问题提出意见，那就太好了。
最好的问候，亚历山大