转自：http://www.cnblogs.com/zsboy/p/3925098.html

看过了这么多不同方向的应用，发现很多程序入门都是helloworld
helloworld是所有程序员的绝对初恋

工程的目录有两个

Classes:程序中的类

AppDelegate.h/cpp：Cocos2d-x程序框架
AppMacros.h:所用到的宏，主要是设置分辩率及对应的资源目录
HelloWorldScene.h/cpp:场景显示层

win32:WIN32程序所涉及的主函数

main.cpp:winMain主函数

WinMain函数：

#include "main.h"
#include "AppDelegate.h"
#include "cocos2d.h"
 
USING_NS_CC;
 
int APIENTRY _tWinMain(HINSTANCE hInstance,HINSTANCE hPrevInstance,LPTSTR    lpCmdLine,int       nCmdShow)
{
    UNREFERENCED_PARAMETER(hPrevInstance);
    UNREFERENCED_PARAMETER(lpCmdLine);
 
    // create the application instance
    AppDelegate app;
    //运行创建程序
    return Application::getInstance()->run();
}

它将程序框架封装为一个类，提供了统一的多平台上基本程序框架的实现。

#include "AppDelegate.h"
#include "HelloWorldScene.h"
 
USING_NS_CC;
 
AppDelegate::AppDelegate() {
 
}
 
AppDelegate::~AppDelegate() 
{
}
 
bool AppDelegate::applicationDidFinishLaunching() {
    // initialize director创建导演
    auto director = Director::getInstance();
    //创建opengl窗口
    auto glview = director->getOpenGLView();
    if(!glview) {
        glview = GLView::create("My Game");
        director->setOpenGLView(glview);
    }
 
    // turn on display FPS 打开FPS
    director->setDisplayStats(true);
 
    // set FPS. the default value is 1.0/60 if you don't call thi 1秒60帧
    director->setAnimationInterval(1.0 / 60);
 
    // create a scene. it's an autorelease object创建场景和层
    auto scene = HelloWorld::createScene();
 
    // run启动场景
    director->runWithScene(scene);
 
    return true;
}
//当收到电话，游戏转入后台服务
// This function will be called when the app is inactive. When comes a phone call,it's be invoked too
void AppDelegate::applicationDidEnterBackground() {
    Director::getInstance()->stopAnimation();
 
    // if you use SimpleAudioEngine,it must be pause
    // SimpleAudioEngine::getInstance()->pauseBackgroundMusic();
}
//当电话完成，选择恢复游戏时，响应这句
// this function will be called when the app is active again
void AppDelegate::applicationWillEnterForeground() {
    Director::getInstance()->startAnimation();
 
    // if you use SimpleAudioEngine,it must resume here
    // SimpleAudioEngine::getInstance()->resumeBackgroundMusic();
}

下面我们来看一下HelloWorld场景,它是一个基于cocos2d::Layer的派生类。cocos2d::Layer是什么？在这里，我想打个比方来建立一些基本的认知，比方说我们生活在地球上，地球属于宇宙内的一部分。从Cocos2d-x的框架体系来看，我们是Sprite精灵，地球是Layer，而宇宙是Scene。

一个程序要想表现出精彩的世界，要先建立一个宇宙Scene，然后增加地球，月球，太阳等Layer，然后在这些Layer上增加相应的物体。而我们站在地球上，地球运动，我们也会跟着一起运动。

OK，现在我们来看一下如何创建Scene和Layer:

HelloWorldScene.h:

#include "HelloWorldScene.h"
 
USING_NS_CC;
 
Scene* HelloWorld::createScene()
{
    // 'scene' is an autorelease object
    auto scene = Scene::create();
     
    // 'layer' is an autorelease object
    auto layer = HelloWorld::create();
 
    // add layer as a child to scene
    scene->addChild(layer);
 
    // return the scene
    return scene;
}
 
// on "init" you need to initialize your instance
bool HelloWorld::init()
{
    //////////////////////////////
    // 1. super init first
    if ( !Layer::init() )
    {
        return false;
    }
    //得到屏幕的大小，得到原点
    Size visibleSize = Director::getInstance()->getVisibleSize();
    Vec2 origin = Director::getInstance()->getVisibleOrigin();
 
    /////////////////////////////
    // 2. add a menu item with "X" image,which is clicked to quit the program
    //    you may modify it.
    //   // 创建一个菜单项，它由两张图片来表现普通状态和按下状态，设置按下时调用menuCloseCallback函数响应关闭  
    // add a "close" icon to exit the progress. it's an autorelease object
    auto closeItem = MenuItemImage::create(
                                           "CloseNormal.png","CloseSelected.png",CC_CALLBACK_1(HelloWorld::menuCloseCallback,this));
    //指定菜单位置,菜单项
    closeItem->setPosition(Vec2(origin.x + visibleSize.width - closeItem->getContentSize().width/2,origin.y + closeItem->getContentSize().height/2));
 
    // create menu,it's an autorelease object菜单项放到菜单里
    auto menu = Menu::create(closeItem,NULL);
    menu->setPosition(Vec2::ZERO);
    this->addChild(menu,1);//放到当前的层
 
    /////////////////////////////
    // 3. add your codes below...
 
    // add a label shows "Hello World"
    // create and initialize a label
    //创建标签
    auto label = LabelTTF::create("Hello World","Arial",24);
     
    // position the label on the center of the screen标签位置
    label->setPosition(Vec2(origin.x + visibleSize.width/2,origin.y + visibleSize.height - label->getContentSize().height));
 
    // add the label as a child to this layer将标签放到层中
    this->addChild(label,1);
 
    // add "HelloWorld" splash screen"创建图片精灵
    auto sprite = Sprite::create("HelloWorld.png");
 
    // position the sprite on the center of the screen精灵位置
    sprite->setPosition(Vec2(visibleSize.width/2 + origin.x,visibleSize.height/2 + origin.y));
 
    // add the sprite as a child to this layer将精灵放到层中
    this->addChild(sprite,0);
     
    return true;
}
 
//点close菜单项的时候来回调的
void HelloWorld::menuCloseCallback(Ref* pSender)
{
    ////如果是WP8平台，弹出消息框提示一下。  
#if (CC_TARGET_PLATFORM == CC_PLATFORM_WP8) || (CC_TARGET_PLATFORM == CC_PLATFORM_WINRT)
    MessageBox("You pressed the close button. Windows Store Apps do not implement a close button.","Alert");
    return;
#endif
    //终止程序。
    Director::getInstance()->end();
    //如果是ios平台
#if (CC_TARGET_PLATFORM == CC_PLATFORM_IOS)
    exit(0);
#endif
}

参考：http://blog.csdn.net/honghaier/article/details/24518863（谢谢）