#include "HelloWorldScene.h"
#include "cocos-ext.h"
using namespace cocos2d::extension;

using namespace cocos2d;

CCScene* HelloWorld::scene()
{
    CCScene * scene = NULL;
    do
    {
        // 'scene' is an autorelease object
        scene = CCScene::create();
        CC_BREAK_IF(! scene);

        // 'layer' is an autorelease object
        HelloWorld *layer = HelloWorld::create();
        CC_BREAK_IF(! layer);

        // add layer as a child to scene
        scene->addChild(layer);
    } while (0);

    // return the scene
    return scene;
}

// on "init" you need to initialize your instance
bool HelloWorld::init()
{
    bool bRet = false;
    do
    {
        //////////////////////////////////////////////////////////////////////////
        // super init first
        //////////////////////////////////////////////////////////////////////////

        CC_BREAK_IF(! CCLayer::init());
        //正常状态下的按钮图片
        CCScale9Sprite*btnNormal=CCScale9Sprite::create("button.png");
        //单击状态下的按钮图片
        CCScale9Sprite*btnDown=CCScale9Sprite::create("buttonHighlighted.png");
        //按钮标题
        CCLabelTTF*title=CCLabelTTF::create("Touch Me!","Maker Felt",30);
        //创建按钮，按钮的大小会根据标题自动调整
        CCControlButton*controlBtn=CCControlButton::create(title,btnNormal);
        //当鼠标处于按下并点中按钮时，则触发一次
        controlBtn->addTargetWithActionForControlEvents(this,
            cccontrol_selector(HelloWorld::touchDown),
         CCControlEventTouchDown);
        //设置按钮按下时的图片
        controlBtn->setBackgroundSpriteForState(btnDown,CCControlStateSelected);
        controlBtn->setPosition(ccp(200,200));
        //controlBtn->setPreferredSize(CCSize(200,200));////强制设置按钮大小，如果按钮标题大小超过这个范围，则会自动扩大//
        this->addChild(controlBtn);
        bRet=true;
    }while(0);
    return bRet;
}
        /*CCScale9Sprite*nineGirl=CCScale9Sprite::create("button.png");
        nineGirl->setContentSize(CCSize(200,100));
        nineGirl->setPosition(ccp(200,200));
        this->addChild(nineGirl);
        bRet=true;
    }while(0);
    return bRet;
}*/

        //////////////////////////////////////////////////////////////////////////
        // add your codes below...
        //////////////////////////////////////////////////////////////////////////

        // 1. Add a menu item with "X" image, which is clicked to quit the program.

        // Create a "close" menu item with close icon, it's an auto release object.
        /*CCMenuItemImage *pCloseItem = CCMenuItemImage::create(
            "CloseNormal.png",
            "CloseSelected.png",
            this,
            menu_selector(HelloWorld::menuCloseCallback));
        CC_BREAK_IF(! pCloseItem);

        // Place the menu item bottom-right conner.
        pCloseItem->setPosition(ccp(CCDirector::sharedDirector()->getWinSize().width - 20, 20));

        // Create a menu with the "close" menu item, it's an auto release object.
        CCMenu* pMenu = CCMenu::create(pCloseItem, NULL);
        pMenu->setPosition(CCPointZero);
        CC_BREAK_IF(! pMenu);

        // Add the menu to HelloWorld layer as a child layer.
        this->addChild(pMenu, 1);

        // 2. Add a label shows "Hello World".

        // Create a label and initialize with string "Hello World".
        CCLabelTTF* pLabel = CCLabelTTF::create("Hello World", "Arial", 24);
        CC_BREAK_IF(! pLabel);

        // Get window size and place the label upper.
        CCSize size = CCDirector::sharedDirector()->getWinSize();
        pLabel->setPosition(ccp(size.width / 2, size.height - 50));

        // Add the label to HelloWorld layer as a child layer.
        this->addChild(pLabel, 1);

        // 3. Add add a splash screen, show the cocos2d splash image.
        CCSprite* pSprite = CCSprite::create("HelloWorld.png");
        CC_BREAK_IF(! pSprite);

        // Place the sprite on the center of the screen
        pSprite->setPosition(ccp(size.width/2, size.height/2));

        // Add the sprite to HelloWorld layer as a child layer.
        this->addChild(pSprite, 0);

        bRet = true;
    } while (0);

    return bRet;
}*/

void HelloWorld::menuCloseCallback(CCObject* pSender)
{
    // "close" menu item clicked
    CCDirector::sharedDirector()->end();
}





头文件：
#ifndef __HELLOWORLD_SCENE_H__
#define __HELLOWORLD_SCENE_H__

#include "cocos2d.h"
#include "cocos-ext.h"

#include "SimpleAudioEngine.h"
using namespace cocos2d::extension;

class HelloWorld : public cocos2d::CCLayer
{
public:
    // Here's a difference. Method 'init' in cocos2d-x returns bool, instead of returning 'id' in cocos2d-iphone
    virtual bool init();  

    // there's no 'id' in cpp, so we recommand to return the exactly class pointer
    static cocos2d::CCScene* scene();
   
    // a selector callback
    void menuCloseCallback(CCObject* pSender);

    // implement the "static node()" method manually
    CREATE_FUNC(HelloWorld);
private:
    void touchDown(CCObject*pSender,CCControlEvent event);
};

#endif  // __HELLOWORLD_SCENE_H__



>HelloWorldScene.obj : error LNK2001: 无法解析的外部符号 "private: void __thiscall HelloWorld::touchDown(class cocos2d::CCObject *,unsigned int)" (?touchDown@HelloWorld@@AAEXPAVCCObject@cocos2d@@I@Z)
1>D:\光盘代码\cocos2d-x书籍源码\Cocos2d-x游戏开发之旅\MutouCocos2dxAllDemos\MutouCocos2dxAllDemos\Chapter4_2_Scale9Sprite\Chapter4_2_Scale9Sprite\Debug.win32\Chapter4_2_Scale9Sprite.win32.exe : fatal error LNK1120: 1 个无法解析的外部命令
1>

我在它的属性-输入里面加入了libExtensions.lib,但还是显示无法显示的外部符号，想请教一下