1.cocos游戏的出发点
在main函数中有一句: return CCApplication::sharedApplication()->run();
2.经过层层深入发现,真正的入口: bool AppDelegate::applicationDidFinishLaunching()
3.类继承关系图:
4.代码实现:
CCApplicationProtocol的头文件如下,.cpp文件为空
#pragma once
class CCApplicationProtocol
{
public:
/*定义了一个虚接口,用于游戏的真正入口*/
virtual bool applicationDidFinishLaunching() = ;
};
CCApplication.h
#pragma once
#include "CCApplicationProtocol.h" #include <iostream>
using namespace std; class CCApplication :public CCApplicationProtocol
{
public:
CCApplication(); /*run方法*/
virtual int run();
/*返回静态指针*/
static CCApplication* sharedApplication(); protected:
/*静态指针,用于实现单例*/
static CCApplication * sm_pSharedApplication;
};
CCApplication.cpp
#include "CCApplication.h" /*cpp文件中初始化静态成员*/
CCApplication * CCApplication::sm_pSharedApplication = NULL; CCApplication::CCApplication()
{
/*将子类对象赋值给父类的静态指针*/
sm_pSharedApplication = this;
} CCApplication* CCApplication::sharedApplication()
{
/*实现单例*/
if (sm_pSharedApplication != NULL)
return sm_pSharedApplication;
} int CCApplication::run()
{
/*调用父类的方法,实现游戏的启动*/
applicationDidFinishLaunching();
return ;
}
AppDelegate.h
#pragma once
#include "CCApplication.h"
class AppDelegate :private CCApplication
{
public:
/*实现了继承来的祖父类方法*/
virtual bool applicationDidFinishLaunching();
};
AppDelegate.cpp
#include "AppDelegate.h" /*实现了继承来的祖父类方法*/
bool AppDelegate::applicationDidFinishLaunching()
{
/*do somethint to iniialize the game*/ cout << "game start" << endl;
return true;
}
测试代码:
#include "AppDelegate.h" int main()
{
AppDelegate app;
CCApplication::sharedApplication()->run(); system("pause");
return ;
}