Question

我正在尝试使用SDL2.0和visual studio 2010 express edition在c ++中制作游戏。我想创建一个类来保存关于某个级别的所有信息，例如地图结构，起始位置，完成位置，加电位置。这个类用在多个源文件中，所以我创建了一个新的.cpp文件，我将在其中存储该类和一个声明该类的.h文件。问题是它不能编译。我收到以下错误：

1>------ Build started: Project: Game, Configuration: Debug Win32 ------
1>  gameMain.cpp
1>c:\users\dennis\documents\visual studio 2010\projects\therealmofinvisiblemazes_game\game\gamemain.cpp(33): error C2079: 'GameMap' uses undefined class 'level'
1>c:\users\dennis\documents\visual studio 2010\projects\therealmofinvisiblemazes_game\game\gamemain.cpp(36): error C2664: 'gameInit' : cannot convert parameter 3 from 'int *' to 'level *'
1>          Types pointed to are unrelated; conversion requires reinterpret_cast, C-style cast or function-style cast
1>  gameLevelObject.cpp
1>  gameInit.cpp
1>c:\users\dennis\documents\visual studio 2010\projects\therealmofinvisiblemazes_game\game\gameinit.cpp(27): error C2027: use of undefined type 'level'
1>          c:\users\dennis\documents\visual studio 2010\projects\therealmofinvisiblemazes_game\game\gamelevelobject.h(3) : see declaration of 'level'
1>c:\users\dennis\documents\visual studio 2010\projects\therealmofinvisiblemazes_game\game\gameinit.cpp(27): error C2440: '<function-style-cast>' : cannot convert from 'short' to 'level'
1>          Source or target has incomplete type
1>  Generating Code...

实际游戏是作为DLL创建的，因此我可以向主体添加菜单或视频等内容。这些是导致错误的来源：

gameMain.cpp：

//  STD
#include <string>
#include <IOstream>
#include <map>

//  GAME
#include "Global_Includes.h"    //Include all SDL libs
#include "Global_Mapping.h"     //Include object that tells program what to do when this part is finished
#include "Global_Events.h"      //Include object to control events
#include "Global_Screen.h"      //Include object to control screen

//  LOCAL
#include "gameLevelObject.h"    //Include level class
#include "gameInit.h"           //Include function for initialisation

//  DLL EXPORT
#include "gameMain.h"

mapping game(screen* Display, short int Lvl){

    mapping ReturnValue;
    level GameMap;              //Error: Incomplete type
    gameInit(Lvl, Display, &GameMap);
}

gameInit.cpp：

//  STD
#include <map>

//  GAME
#include "Global_Includes.h"  //Include all SDL libs
#include "Global_Screen.h"    //Include object to control screen
#include "gameLevelObject.h"  //Include level class
#include "gameInit.h"         //Include header so compiler knows where gameInit is defined

bool gameInit(short int lvl, screen* Display, level* object){

    *object = level::level(lvl); //Error: Incomplete type

    return true;
}

gameLevelObject.cpp：

//  GAME
#include "Global_Includes.h"    //Include all SDL libs

//  STD
#include <string>
#include <vector>
#include <fstream>
#include <iostream>

//  LOCAL
#include "gameLevelObject.h"    //Include header so compiler knows where class level is defined

class level{

    SDL_Surface* total_map;
    int lives;
    int livesMINUS;
    int livesPLUS;
    int position[2];
    std::vector<std::string> map;
    std::vector<std::pair<int, int> > energyTILES; 

public:
    level(short int lvl){\*constructor definition*\}
};

gameLevelObject.h：

#include <vector>

class level;

我在Bjarne Stroustrup编写的“编程语言c ++”一书中读到，这就是你应该包含文件的方式。

问题是：为什么编译器不知道gameLevelObject.cpp中定义了class level？为什么编译器和gameInit找不到函数class level？我使用相同的方法将它们链接到gameMain.cpp

未找到单独文件中的c ++类定义

0 个答案: