I’m trying to create a flappy bird clone, and I was testing my progress so far from the windows desktop executable and all was going well. I could see my background that I had put up. It was good.
Then I created the Bird class, and when referencing it in the init() of my main class (haven’t renamed it, it’s HelloWorldScene), I’m getting this error on MS VS 2010:
1>HelloWorldScene.obj : error LNK2019: unresolved external symbol "public: static class Bird * __cdecl Bird::createBirdWithFileName(char const *)" (?createBirdWithFileName@Bird@@SAPAV1@PBD@Z) referenced in function "public: virtual bool __thiscall HelloWorld::init(void)" (?init@HelloWorld@@UAE_NXZ) 1>C:\AndroidDev\cocos2d-x-2.2.1\projects\FlappyFux\proj.win32\Debug.win32\FlappyFux.exe : fatal error LNK1120: 1 unresolved externals ========== Build: 0 succeeded, 1 failed, 5 up-to-date, 0 skipped ==========
My Bird.h:
`
#ifndef __BIRD_H__
#define __BIRD_H__
#include "cocos2d.h"
class Bird: public cocos2d::CCSprite {
public:
static Bird* createBirdWithFileName( const char *filename);
void updateBird(float dt);
void resetBird();
int getState();
void setState(int state);
void setStartSpeed();
private:
static const int StartSpeedY;
int _state;
int _speedY;
};
#endif /* __BIRD_H__ */
`
My Bird.cpp:
`
#include “Bird.h”
USING_NS_CC;
Bird* createBirdWithFileName(const char *fileName)
{
Bird *pobSprite = new Bird();
if (pobSprite && pobSprite->initWithFile(fileName))
{
// pobSprite->scheduleUpdate();
pobSprite->autorelease();
return pobSprite;
}
CC_SAFE_DELETE(pobSprite);
return NULL;
}
void Bird::updateBird(float dt)
{
}
void Bird::resetBird()
{
}
int Bird::getState()
{
return 0;
}
void Bird::setState(int state)
{
}
void Bird::setStartSpeed()
{
}
`
Here’s my HelloWorldScene.cpp:
`
#include “HelloWorldScene.h”
#include “Bird.h”
USING_NS_CC;
CCScene* HelloWorld::scene()
{
// 'scene' is an autorelease object
CCScene *scene = CCScene::create();
// 'layer' is an autorelease object
HelloWorld *layer = HelloWorld::create();
// add layer as a child to scene
scene->addChild(layer);
// return the scene
return scene;
}
// on "init" you need to initialize your instance
bool HelloWorld::init()
{
//////////////////////////////
// 1. super init first
if ( !CCLayer::init() )
{
return false;
}
CCSize visibleSize = CCDirector::sharedDirector()->getVisibleSize();
CCPoint origin = CCDirector::sharedDirector()->getVisibleOrigin();
/////////////////////////////
// 2. add a menu item with "X" image, which is clicked to quit the program
// you may modify it.
// add a "close" icon to exit the progress. it's an autorelease object
CCMenuItemImage *pCloseItem = CCMenuItemImage::create(
"CloseNormal.png",
"CloseSelected.png",
this,
menu_selector(HelloWorld::menuCloseCallback));
pCloseItem->setPosition(ccp(origin.x + visibleSize.width - pCloseItem->getContentSize().width/2 ,
origin.y + pCloseItem->getContentSize().height/2));
// create menu, it's an autorelease object
CCMenu* pMenu = CCMenu::create(pCloseItem, NULL);
pMenu->setPosition(CCPointZero);
this->addChild(pMenu, 1);
/////////////////////////////
// 3. add your codes below...
// add a label shows "Hello World"
// create and initialize a label
CCLabelTTF* pLabel = CCLabelTTF::create("Flappy Fux", "Arial", 24);
// position the label on the center of the screen
pLabel->setPosition(ccp(origin.x + visibleSize.width/2,
origin.y + visibleSize.height - pLabel->getContentSize().height));
// add the label as a child to this layer
this->addChild(pLabel, 1);
// add "HelloWorld" splash screen"
CCSprite* pSprite = CCSprite::create("FLBG-HD.png");
// position the sprite on the center of the screen
pSprite->setPosition(ccp(visibleSize.width/2 + origin.x, visibleSize.height/2 + origin.y));
// add the sprite as a child to this layer
this->addChild(pSprite, 0);
bird_ = Bird::createBirdWithFileName("bird-HD.png");
bird_->setPosition(ccp(visibleSize.width/4 + origin.x, visibleSize.height/3 + origin.y));
this->addChild(bird_,2);
this->setTouchEnabled(true);
return true;
}
void HelloWorld::ccTouchesBegan(CCSet* touches, CCEvent* event)
{
}
void HelloWorld::ccTouchesMoved(CCSet* touches, CCEvent* event)
{
}
void HelloWorld::ccTouchesEnded(CCSet* touches, CCEvent* event)
{
CCSetIterator i;
CCTouch *touch;
CCPoint tap;
for(i = touches->begin(); i!=touches->end(); i++ )
{
touch = (CCTouch *)(*i);
if(touch)
{
tap = touch->getLocation();
CCLOG("Touched at %.2f, %.2f",tap.x,tap.y);
}
}
}
void HelloWorld::menuCloseCallback(CCObject* pSender)
{
#if (CC_TARGET_PLATFORM == CC_PLATFORM_WINRT) || (CC_TARGET_PLATFORM == CC_PLATFORM_WP8)
CCMessageBox("You pressed the close button. Windows Store Apps do not implement a close button.","Alert");
#else
CCDirector::sharedDirector()->end();
#if (CC_TARGET_PLATFORM == CC_PLATFORM_IOS)
exit(0);
#endif
#endif
}
`
What am I doing wrong? I know that if I were adding another class when working for Android, I’d have to add the added class files in the Android.mk make file. Is there something similar to do when working with MS VS 2010 for win32?
