cocos2dx的内存管理机制

1

//对象创建的时候引用计数被设置为1，这个是在它的构造函数中完成的，它会先调用父类CCOjbect的构造函数

2

//CCObject的构造函数如下所示

3

//CCObject::CCObject(void)

4

//,
 m_uReference(1) {}// when the object is created, the reference count of it is 1

5

CCSprite
 * sprite =

new

CCSprite();

6

7

CCLog(

"retain
 count:%d"

,sprite->retainCount());

8

9

//调用retain方法的时候引用计数增加1

10

sprite->retain();

11

CCLog(

"retain
 count:%d"

,sprite->retainCount());

12

13

//调用release方法的时候引用计数减一，当这个引用计数减为0的时候，在release方法中会delete掉这个对象

14

sprite->release();

15

CCLog(

"retain
 count:%d"

,sprite->retainCount());

16

17

//当我们调用autorelease方法的时候会调用这段代码

18

//CCPoolManager::sharedPoolManager()->addObject(this);

19

//调用autorelease方法的时候对象会被放到自动回收池中，这个自动回收池在每帧结束的时候会调用一次对象的release方法

20

sprite->autorelease();

21

CCLog(

"retain
 count:%d"

,sprite->retainCount());

1

//在create的时候调用了sprite的autorelease方法

2

CCSprite
 * sprite =CCSprite::create(

"HelloWorld.png"

);

3

CCLog(

"retain
 count:%d"

,sprite->retainCount());

//retain
 1

4

this

->addChild(sprite);

5

CCLog(

"retain
 count:%d"

,sprite->retainCount());

//retain
 2

1

bool

HelloWorld::init()

2

{

3

4

if

(
 !CCLayer::init() )

5

{

6

return

false

;

7

}

8

9

CCMenuItemImage
 *pCloseItem = CCMenuItemImage::create(

10

"CloseNormal.png"

,

11

"CloseSelected.png"

,

12

this

,

13

menu_selector(HelloWorld::menuCloseCallback));

14

15

CCMenu*
 pMenu = CCMenu::create(pCloseItem, NULL);

16

17

this

->addChild(pMenu,
 1);

18

19

this

->m_sprite
 = CCSprite::create(

"HelloWorld.png"

);

20

CCLog(

"%d"

,

this

->m_sprite->retainCount());

21

22

return

true

;

23

}

24

//按钮的响应事件

25

void

HelloWorld::menuCloseCallback(CCObject*
 pSender)

26

{

27

CCLog(

"%d"

,

this

->m_sprite->retainCount());

28

this

->m_sprite->getPosition();

29

}

1

this

->m_sprite
 = CCSprite::create(

"HelloWorld.png"

);

2

CCLog(

"%d"

,

this

->m_sprite->retainCount());

3

this

->m_sprite->retain();

4

CCLog(

"%d"

,

this

->m_sprite->retainCount());

1

bool

HelloWorld::init()

2

{

3

bool

bRet
 =

false

;

4

do

5

{

6

//////////////////////////////////////////////////////////////////////////

7

//
 父类初始化

8

//////////////////////////////////////////////////////////////////////////

9

10

CC_BREAK_IF(!
 CCLayer::init());

11

CCSprite*
 bomb1 = CCSprite::create(

"CloseNormal.png"

);

12

CCSprite*
 bomb2 = CCSprite::create(

"CloseNormal.png"

);

13

CCSprite*
 bomb3 = CCSprite::create(

"CloseNormal.png"

);

14

CCSprite*
 bomb4 = CCSprite::create(

"CloseNormal.png"

);

15

CCSprite*
 bomb5 = CCSprite::create(

"CloseNormal.png"

);

16

CCSprite*
 bomb6 = CCSprite::create(

"CloseNormal.png"

);

17

18

addChild(bomb1,1);

19

addChild(bomb2,1);

20

addChild(bomb3,1);

21

addChild(bomb4,1);

22

addChild(bomb5,1);

23

addChild(bomb6,1);

24

25

m_pBombsDisplayed
 = CCArray::create(bomb1,bomb2,bomb3,bomb4,bomb5,bomb6,NULL);

26

27

this

->scheduleUpdate();

28

29

bRet
 =

true

;

30

}

while

(0);

31

32

return

bRet;

33

}

34

35

void

HelloWorld::update(ccTime
 dt)

36

{

37

refreshData();

38

}

39

40

void

HelloWorld::refreshData()

41

{

42

m_pBombsDisplayed->objectAtIndex(0)->setPosition(cpp(100,100));

43

}