以下内容基于cocos2d-x 2.2.5+Visual Studio2012，除特别注明外均为原创，如有纰漏，请m本人-_-
步骤一、运行起始
打开.../cocos2d-x 2.2.5/cocos2d-win32.vc2012.sln，可以看到里面有个HelloCpp，右键“设为启动项目”，Ctrl+F5非调试运行之后可以看到运行成功界面。
这里我们主要来了解程序运行过程，首先c语言以main.cpp文件为程序入口（因为里面有_tWinMain函数），打开win32/main.cpp
int APIENTRY _tWinMain(HINSTANCE hInstance,HINSTANCE hPrevInstance,LPTSTR lpCmdLine,int nCmdShow)
{
...
...
// create the application instance
AppDelegate app;
CCEGLView* eglView = CCEGLView::sharedOpenGLView();
eglView->setViewName("HelloCpp");
eglView->setFrameSize(2048,1536);
// The resolution of ipad3 is very large. In general,PC's resolution is smaller than it.
// So we need to invoke 'setFrameZoomFactor'(only valid on desktop(win32,mac,linux)) to make the window smaller.
eglView->setFrameZoomFactor(0.4f);
return CCApplication::sharedApplication()->run();
}
首先，APIENTRY是一个宏定义，定义函数调用方式，_tWinMain是一个宏定义，定义入口函数名称wWinMain，接着跟一堆的函数参数（有兴趣深入了解的可baidu或F12）。
接着，通过
AppDelegate app;
实例化AppDelegate，这个东西强行翻译成中文就是“App委托”，是谁的委托呢？来详细看看AppDelegate
class AppDelegate : private cocos2d::CCApplication
我们可以看到AppDelegate是作为CCApplication的委托，每个程序顶层都会有个Application在统一管理，cocos2d-x也不例外，来看看CCApplication在管理什么
class AppDelegate : private cocos2d::CCApplication
class CC_DLL CCApplication : public CCApplicationProtocol
class CC_DLL CCApplicationProtocol
{
public:
virtual ~CCApplicationProtocol() {}
/**
@brief Implement CCDirector and CCScene init code here.
@return true Initialize success,app continue.
@return false Initialize Failed,app terminate.
*/
virtual bool applicationDidFinishLaunching() = 0;
/**
@brief The function be called when the application enter background
@param the pointer of the application
*/
virtual void applicationDidEnterBackground() = 0;
/**
@brief The function be called when the application enter foreground
@param the pointer of the application
*/
virtual void applicationWillEnterForeground() = 0;
/**
@brief Callback by CCDirector for limit FPS.
@interval The time,expressed in seconds,between current frame and next.
*/
virtual void setAnimationInterval(double interval) = 0;
/**
@brief Get current language config
@return Current language config
*/
virtual ccLanguageType getCurrentLanguage() = 0;
/**
@brief Get target platform
*/
virtual TargetPlatform getTargetPlatform() = 0;
};
原来CCApplication把自身的生命周期事件applicationDidFinishLaunching等委托给了AppDelegate，所以在AppDelegate中必须重写这几个方法：
applicationDidFinishLaunching
applicationDidEnterBackground
applicationWillEnterForegroundok，上面解释了cocos2d-x为什么要有一个AppDelegate，我们继续看main.cpp
刚刚看到实例化了一个AppDelegate，接着
CCEGLView* eglView = CCEGLView::sharedOpenGLView();
eglView->setViewName("HelloCpp");
eglView->setFrameSize(2048,linux)) to make the window smaller.
eglView->setFrameZoomFactor(0.4f);
实例化了一个单例对象CCEGLView
bool CCEGLView::Create()
{
...
HINSTANCE hInstance = GetModuleHandle( NULL );
WNDCLASS wc; // Windows Class Structure
// Redraw On Size,And Own DC For Window.
wc.style = CS_HREDRAW | CS_VREDRAW | CS_OWNDC;
wc.lpfnWndProc = _WindowProc; // WndProc Handles Messages
wc.cbClsExtra = 0; // No Extra Window Data
wc.cbWndExtra = 0; // No Extra Window Data
wc.hInstance = hInstance; // Set The Instance
wc.hIcon = LoadIcon( NULL,IDI_WINlogo ); // Load The Default Icon
wc.hCursor = LoadCursor( NULL,IDC_ARROW ); // Load The Arrow Pointer
wc.hbrBackground = NULL; // No Background required For GL
wc.lpszMenuName = m_menu; //
wc.lpszClassName = kWindowClassName; // Set The Class Name
...
return bRet;
}
return CCApplication::sharedApplication()->run();
int CCApplication::run()
{
// Initialize instance and cocos2d.
if (! applicationDidFinishLaunching())
{
return 0;
}
return -1;
}
bool AppDelegate::applicationDidFinishLaunching() {
// initialize director
CCDirector* pDirector = CCDirector::sharedDirector();
CCEGLView* pEGLView = CCEGLView::sharedOpenGLView();
pDirector->setOpenGLView(pEGLView);
....
// 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;
} 到这里就显示HelloWorld界面了，下一节我们说说CCDirector
