cocos2d学习（02）——CCApplication类中的run方法分析

 1: int CCApplication::run()

 2: {

 3:     PVRFrameEnableControlWindow(false);    //windows相关的，不理会

 4:

 5:     // Main message loop: message消息loop循环

 6:     MSG msg;

 7:     LARGE_INTEGER nFreq;

 8:     LARGE_INTEGER nLast;

 9:     LARGE_INTEGER nNow;

 10:     //WinBase.h中声明的两个函数，不用理会

 11:     QueryPerformanceFrequency(&nFreq);

 12:     QueryPerformanceCounter(&nLast);

 13:

 14:     //初始化cocos2d应用实例

 15:     // Initialize instance and cocos2d.

 16:     if (!applicationDidFinishLaunching())

 17:     {

 18:         //applicationDidFinishLaunching()函数在AppDelegate中实现

 19:         return 0;

 20:     }

 21:     //下面都是和windows窗口显示相关的，暂时不理会

 22:     CCEGLView* pMainWnd = CCEGLView::sharedOpenGLView();

 23:     pMainWnd->centerWindow();

 24:     ShowWindow(pMainWnd->getHWnd(),SW_SHOW);

 25:     //死循环，程序

 26:     while (1)

 27:     {

 28:         if (! PeekMessage(&msg,NULL,PM_REMOVE))

 29:         {

 30:             // Get current time tick.获取当前时间标记

 31:             QueryPerformanceCounter(&nNow);

 32:             //获取到的时间是绘制下一个帧的时间，就绘制。否则继续while循环

 33:             // If it's the time to draw next frame,draw it,else sleep a while.

 34:             if (nNow.QuadPart - nLast.QuadPart > m_nAnimationInterval.QuadPart)

 35:             {

 36:                 nLast.QuadPart = nNow.QuadPart;

 37:                 CCDirector::sharedDirector()->mainLoop();

 38:             }

 39:             else

 40:             {

 41:                 Sleep(0);

 42:             }

 43:             continue;

 44:         }

 45:

 46:         if (WM_QUIT == msg.message)

 47:         {

 48:             // Quit message loop.

 49:             break;

 50:         }

 51:

 52:         // Deal with windows message.

 53:         if (! m_hAccelTable || ! TranslateAccelerator(msg.hwnd,m_hAccelTable,&msg))

 54:         {

 55:             TranslateMessage(&msg);

 56:             DispatchMessage(&msg);

 57:         }

 58:     }

 59:

 60:     return (int) msg.wParam;

 61: }