如何调用在另一个文件上找到的函数？ [英] How to call on a function found on another file?

问题描述

我最近开始使用C ++和SFML库，我想知道我是否在适当地称为 player.cpp的文件上定义了Sprite，如何在位于 main的主循环中调用它？ cpp？

I'm recently starting to pick up C++ and the SFML library, and I was wondering if I defined a Sprite on a file appropriately called "player.cpp" how would I call it on my main loop located at "main.cpp"?

这是我的代码（请注意，这是SFML 2.0，而不是1.6！）。

Here is my code (Be aware that this is SFML 2.0, not 1.6!).

main.cpp

#include "stdafx.h"
#include <SFML/Graphics.hpp>
#include "player.cpp"

int main()
{
    sf::RenderWindow window(sf::VideoMode(800, 600), "Skylords - Alpha v1");

    while (window.isOpen())
    {
        sf::Event event;
        while (window.pollEvent(event))
        {
            if (event.type == sf::Event::Closed)
                window.close();
        }

        window.clear();
        window.draw();
        window.display();
    }

    return 0;
}

player.cpp

player.cpp

#include "stdafx.h"
#include <SFML/Graphics.hpp>

int playerSprite(){
    sf::Texture Texture;
    if(!Texture.loadFromFile("player.png")){
        return 1;
    }
    sf::Sprite Sprite;
    Sprite.setTexture(Texture);
    return 0;
}

我需要帮助的地方是 main.cpp 在我的绘图代码中显示 window.draw（）; 的位置。在该括号中，应该有要加载到屏幕上的Sprite的名称。据我搜索并通过猜测进行的尝试，我还没有成功地使该draw函数与我的sprite在另一个文件上一起使用。
我觉得我缺少大的东西，而且非常明显（在两个文件中都非常明显），但是每位专业人士再一次都是新手。

Where I need help is in the main.cpp where it says window.draw(); in my draw code. In that parenthesis, there should be the name of the Sprite that I want to load onto the screen. As far as I've searched, and tried by guessing, I have not succeeded into making that draw function work with my sprite on the other file. I feel like I'm missing something big, and very obvious (on either files), but then again, every pro was once a newb.

推荐答案

您可以使用头文件。

良好做法。

您可以创建一个名为 player.h的文件在该头文件中声明其他cpp文件所需的所有功能，并在需要时将其包括在内。

You can create a file called player.h declare all functions that are need by other cpp files in that header file and include it when needed.

player.h

#ifndef PLAYER_H    // To make sure you don't declare the function more than once by including the header multiple times.
#define PLAYER_H

#include "stdafx.h"
#include <SFML/Graphics.hpp>

int playerSprite();

#endif

player.cpp

#include "player.h"  // player.h must be in the current directory. or use relative or absolute path to it. e.g #include "include/player.h"

int playerSprite(){
    sf::Texture Texture;
    if(!Texture.loadFromFile("player.png")){
        return 1;
    }
    sf::Sprite Sprite;
    Sprite.setTexture(Texture);
    return 0;
}

main.cpp

#include "stdafx.h"
#include <SFML/Graphics.hpp>
#include "player.h"            //Here. Again player.h must be in the current directory. or use relative or absolute path to it.

int main()
{
    // ...
    int p = playerSprite();  
    //...

---

不这样的好习惯，但适用于小型项目。在main.cpp中声明您的函数

---

Not such a good practice but works for small projects. declare your function in main.cpp

#include "stdafx.h"
#include <SFML/Graphics.hpp>
// #include "player.cpp"


int playerSprite();  // Here

int main()
{
    // ...   
    int p = playerSprite();  
    //...

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