Question

我有一个结构，用于在标题中声明纹理，精灵，音乐，字体，声音等。然后我使用相应的.cpp文件将所述纹理设置为相应的精灵，依此类推。

我在main中创建了struct对象，并调用了该函数。但是当我构建我的程序时，我得到了一个百万＆＃34;未声明的标识符＆＃34;错误。我究竟做错了什么？这是我的代码：

resources.h：

#ifndef __SFML__resources__
#define __SFML__resources__

#include "SFML/Audio.hpp"
#include "SFML/Graphics.hpp"

struct resources
{
float opacity = 1.0;

sf::Texture texturePlayer;
sf::Texture textureSettingsMenu;
sf::Sprite spriteSaveMenu;
sf::Sprite spriteSettingsMenu;
//start screen texture
sf::Texture textureStart;
//gamestate background sprite
sf::Sprite spriteScreen;
sf::Font font;
sf::Font font2;
int loadResources();
// hundreds more lines of declarations below
//...
};
#endif

resources.cpp：

#include "resources.h"


int resources::loadResources()
{
if (!textureSaveMenu.loadFromFile("images/magicmenu3.png"))
    return EXIT_FAILURE;


if (!textureSettingsMenu.loadFromFile("images/inventorymenu.png"))
    return EXIT_FAILURE;

spriteSaveMenu.setTexture(textureSaveMenu);
spriteSettingsMenu.setTexture(textureSettingsMenu);

if (!textureStart.loadFromFile("images/skyocean.png"))
    return EXIT_FAILURE;

if (!font.loadFromFile("fonts/arial.ttf"))
    return EXIT_FAILURE;

if (!font2.loadFromFile("fonts/dominican.ttf"))
    return EXIT_FAILURE;

if (!musicBattle.openFromFile("audio/musicBattle.ogg"))
    return EXIT_FAILURE;
musicBattle.setVolume(20);
musicBattle.setLoop(true);


if (!musicOpening.openFromFile("audio/maintheme.ogg"))
    return EXIT_FAILURE;
musicOpening.setVolume(30);
musicOpening.setLoop(true);

if (!musicDefeat.openFromFile("audio/defeat.ogg"))
    return EXIT_FAILURE;
musicDefeat.setVolume(50);
musicDefeat.setLoop(true);

if (!musicForest.openFromFile("audio/forest.ogg"))
    return EXIT_FAILURE;
musicForest.setVolume(10);
musicForest.setLoop(true);

if (!musicWorldMap.openFromFile("audio/bluefields.ogg"))
    return EXIT_FAILURE;
musicWorldMap.setVolume(40);
musicWorldMap.setLoop(true);

if (!musicVillage.openFromFile("audio/welcomehome.ogg"))
    return EXIT_FAILURE;
musicVillage.setVolume(40);
musicVillage.setLoop(true);

//every single declared resource is set within this function
//but the function is too large to display fully here
}

main.cpp中：

 #include "SFML/Audio.hpp"
 #include "SFML/Graphics.hpp"
 #include <iostream>
 #include "random.h"
 #include "player.h"
 #include "entity.h"
 #include "projectile.h"
 #include "enemy.h"
 #include "textDisplay.h"
 #include "pickup.h"
 #include "wall.h"
 #include "sword.h"
 #include "npc.h"
 #include "battlemenu.h"
 #include "cursor.h"
 #include "name.h"
 #include "itemshop.h"
 #include "characterselection.h"
 #include "mainmenu.h"
 #include "exp.h"
 #include "drops.h"
 #include "weaponshop.h"
 #include "armorshop.h"
 #include "startmenu.h"
 #include "room.h"
 #include "resources.h"


int main()
{
//create the main window
sf::RenderWindow window(sf::VideoMode(720, 500), "Sky Ocean");
window.setFramerateLimit(60);
window.setKeyRepeatEnabled(false);

//View
sf::View view1(sf::FloatRect(200, 200, 300, 200));
view1.setSize(sf::Vector2f(window.getSize().x, window.getSize().y));
view1.setCenter(sf::Vector2f(view1.getSize().x / 2, view1.getSize().y / 2));
window.setView(view1);

//load resources
struct resources resources1;
resources1.loadResources();

//class object
class player Player1;
Player1.sprite.setTexture(texturePlayer);

class player Player2;
Player2.sprite.setTexture(texturePlayer);
Player2.rect.setScale(1.6, 1.6);
Player2.sprite.setScale(1.6, 1.6);

//...
}

Answer 1

首先，我建议您阅读有关标题文件的something。

resources.h确实不包含所用标识符的声明。

您必须使用包含这些声明的#include头文件，以便编译器能够看到它们。请阅读SFML declaration以查看需要包含哪些模块，并#include将其添加到标题文件中，现在您只将它们包含在main.cpp中， main.cpp包含标识符声明。当编译器读取resources.cpp时，它没有看到那些声明，因此undeclared identifier错误。

例如，

resources.h应该如下所示：

//...

#include "entity.h"

#include <SFML/Graphics.hpp>
#include <Whatever.hpp>

struct resources
{

//...

从函数C ++ / SFML加载资源时出现问题

1 个答案: