?????? 从上一篇《Cocos2d-x 2.0 在Windows平台下的使用》已经初步了解了Cocos2d-x的安装、编译，也已经可以运行HelloWorld示例了，运行HelloWorld至少所需的文件，包括：素材、动态库，我们把"...Release.win32"里的"HelloWorld.exe"单独拷贝到一个新文件夹，至少所需的文件如下图所示：
打开cocos2d-win32.vc2008.sln，展开"HelloWorld"工程，工程结构如下所示：
对应"...HelloWorld"文件夹的结构如下所示：
可知"Classes"放置游戏开发逻辑相关、平台无关的代码，"Resources"放置图片、声音、配置等资源，"win32"等放置平台相关的代码。
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了解如何运行，在win32下就从main()函数开始，打开"main.cpp"，代码如下所示：?
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#include?
"main.h"
#include?
"../Classes/AppDelegate.h"
#include?
"CCEGLView.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;
????CCEGLView&?eglView?=?CCEGLView::sharedOpenGLView();
????eglView.setViewName(
"Hello?World");
????eglView.setFrameSize(
480,?
320);
????
//?set?the?design?resolution?screen?size,?if?you?want?to?use?Design?Resoulution?scaled?to?current?screen,?please?uncomment?next?line.
????
//?eglView.setDesignResolutionSize(480,?320);
????
return?CCApplication::sharedApplication().run();
}
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其中
AppDelegate是最主要的类，代理运行着整个应用程序，它的体系如下：
简化流程如下所示：
而CCEGLView是整个程序窗口类，游戏的显示、表现等等都在这上面进行，跟AppDelegate合起来的流程如下：
在CCApplication::run()中调用了applicationDidFinishLaunching()函数，代码如下：
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bool?AppDelegate::applicationDidFinishLaunching()?{?
????
//?initialize?director
????CCDirector?*pDirector?=?CCDirector::sharedDirector();
?
????pDirector->setOpenGLView(&CCEGLView::sharedOpenGLView());
?
????
//?enable?High?Resource?Mode(2x,?such?as?iphone4)?and?maintains?low?resource?on?other?devices.
????
//?pDirector->enableRetinaDisplay(true);
?
????
//?turn?on?display?FPS
????pDirector->setDisplayStats(
true);
?
????
//?set?FPS.?the?default?value?is?1.0/60?if?you?don‘t?call?this
????pDirector->setAnimationInterval(
1.
0?/?
60);
?
????
//?create?a?scene.?it‘s?an?autorelease?object
????CCScene?*pScene?=?HelloWorld::scene();
?
????
//?run
????pDirector->runWithScene(pScene);
?
????
return?
true;
}?
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所做的事情包括：初始化导演类CCDirector 、创建HelloWorld场景、运行场景。HelloWorld场景从CCLayer派生，创建HelloWorld场景所调用如下：
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CCScene*?HelloWorld::scene()?
{
????
//?‘scene‘?is?an?autorelease?object
????CCScene?*scene?=?CCScene::create();
?
????
//?‘layer‘?is?an?autorelease?object
????HelloWorld?*layer?=?HelloWorld::create();
?
????
//?add?layer?as?a?child?to?scene
????scene->addChild(layer);
?
????
//?return?the?scene
????
return?scene;
}?
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实质是创建一个场景类，再创建HelloWorld层，把层放到场景上。创建HelloWorl层的时候，调用了init()函数，init()函数如下：
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bool?HelloWorld::init()?
{
????
//////////////////////////////
????
//?1.?super?init?first
????
if?(?!CCLayer::init()?)
????{
????????
return?
false;
????}
?
????
/////////////////////////////
????
//?2.?add?a?menu?item?with?"X"?image,?which?is?clicked?to?quit?the?program
????
//?you?may?modify?it.
?
????
//?add?a?"close"?icon?to?exit?the?progress.?it‘s?an?autorelease?object
????CCMenuItemImage?*pCloseItem?=?CCMenuItemImage::create(
????????????????????????????????????????
"CloseNormal.png",
????????????????????????????????????????
"CloseSelected.png",
????????????????????????????????????????
this,
????????????????????????????????????????menu_selector(HelloWorld::menuCloseCallback)?);
????pCloseItem->setPosition(?ccp(CCDirector::sharedDirector()->getWinSize().width?-?
20,?
20)?);
?
????
//?create?menu,?it‘s?an?autorelease?object
????CCMenu*?pMenu?=?CCMenu::create(pCloseItem,?
NULL);
????pMenu->setPosition(?CCPointZero?);
????
this->addChild(pMenu,?
1);
?
????
/////////////////////////////
????
//?3.?add?your?codes?below...
?
????
//?add?a?label?shows?"Hello?World"
????
//?create?and?initialize?a?label
????CCLabelTTF*?pLabel?=?CCLabelTTF::create(
"Hello?World",?
"Arial",?
24);
????
//?ask?director?the?window?size
????CCSize?size?=?CCDirector::sharedDirector()->getWinSize();
?
????
//?position?the?label?on?the?center?of?the?screen
????pLabel->setPosition(?ccp(size.width?/?
2,?size.height?-?
50)?);
?
????
//?add?the?label?as?a?child?to?this?layer
????
this->addChild(pLabel,?
1);
?
????
//?add?"HelloWorld"?splash?screen"
????CCSprite*?pSprite?=?CCSprite::create(
"HelloWorld.png");
?
????
//?position?the?sprite?on?the?center?of?the?screen
????pSprite->setPosition(?ccp(size.width/
2,?size.height/
2)?);
?
????
//?add?the?sprite?as?a?child?to?this?layer
????
this->addChild(pSprite,?
0);
?
????
return?
true;
}?
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在这个函数里，创建了各个子元素，创建完之后，用addChild加入到主层上，上面的注释清晰的描述了步骤。
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参考阅读：
1.cocos2d-x初探学习笔记（1）--HelloWorld?http://www.voidcn.com/article/p-oxnsnkkz-qk.html
2.cocos2d-x之HelloWorld范例分析(一)?http://www.lugw.net/?p=80005
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