3.cocos代码入口

模拟代码进入过程：

• main.cpp

   #include <iostream>
   #include "AppDelegate.h"
   #include "CCApplication.h"
   #include "CCApplicationProtocol.h"
   using namespace std;
  
   int main()
   {
       AppDelegate app;
  
       return CCApplication::sharedApplication()->run();
   }

• AppDelegate.h

   #pragma once
   #include "CCApplication.h"
   class AppDelegate :
       public CCApplication
   {
   public:
       AppDelegate();
       virtual ~AppDelegate();
  
       virtual bool applicationDidFinishLaunching();//子类实现了接口
   };

• AppDelegate.cpp

  #include "AppDelegate.h"
  #include <Windows.h>
  
  AppDelegate::AppDelegate()
  {
  }
  
  AppDelegate::~AppDelegate()
  {
  }
  //真正的入口
  bool AppDelegate::applicationDidFinishLaunching()
  {
      MessageBoxA(0, "游戏开始", "提示", 1);
      return false;
  }

• CCApplication.h

   #pragma once
   #include "CCApplicationProtocol.h"
  
   class CCApplication :
       public CCApplicationProtocol
   {
   public:
       CCApplication();
       virtual ~CCApplication();
  
       int run();
  
       static CCApplication *sharedApplication();
       static CCApplication *sm_pSharedApplication;
   };

• CCApplication.cpp

   #include "CCApplication.h"
   #include "stddef.h"
  
   CCApplication * CCApplication::sm_pSharedApplication = NULL;
  
   CCApplication::CCApplication()
   {
       sm_pSharedApplication = this;//注意这个this是子类AppDelegate传过来的
   }
  
   CCApplication::~CCApplication()
   {
   }
   //run调用父类的applicationDidFinishLaunching()方法，父类的方法在子类中实现
  16 int CCApplication::run()
  17 {
  18     applicationDidFinishLaunching();
  19     return 0;
  20 }
  
   CCApplication * CCApplication::sharedApplication()
   {
       if(sm_pSharedApplication != NULL)
           return sm_pSharedApplication;
   }

• CCApplicationProtocol.h

   #pragma once
   class CCApplicationProtocol
   {
   public:
       CCApplicationProtocol();
       virtual ~CCApplicationProtocol();
  
       virtual bool applicationDidFinishLaunching() = ;
   };

• CCApplicationProtocol.cpp

  #include "CCApplicationProtocol.h"
  
  CCApplicationProtocol::CCApplicationProtocol()
  {
  }
  
  CCApplicationProtocol::~CCApplicationProtocol()
  {
  }

运行截图：