Cocos2d-x: 0xC0000005: Access violation reading location 0xCDCDCDD1 - c++

Question

everyone:
The problem is strange. I paste my code first.
void GameObjectsLayer::updateEnemy(float interval)
{
UNREFERENCED_PARAMETER(interval);
Enemy *lpEnemy = new Enemy("enemy1.png", 1, 10, 8);
lpEnemy->getSprite()->setAnchorPoint(CCPointZero);
lpEnemy->setPosition(ccp(-30, 400));
CCMoveTo *lpMoveAction = CCMoveTo::create(350.0f / ENEMY1_MOVE_SPEED, ccp(320, lpEnemy->getPosition().y));
CCCallFuncND *lpCallback = CCCallFuncND::create(lpEnemy->getSprite(), callfuncND_selector(GameObjectsLayer::removeEnemy), lpEnemy);
CCSequence *lpSeqActions = CCSequence::create(lpMoveAction, lpCallback, NULL);
this->addChild(lpEnemy->getSprite(), 10);
lpEnemy->getSprite()->runAction(lpSeqActions);
// When I set the breakpoint here, the _vEnemies is valid and the application runs well.
_vEnemies->push_back(lpEnemy);
}
void GameObjectsLayer::removeEnemy(CCNode *lpSender, void *lpParam)
{
Enemy *lpEnemy = (Enemy*)lpParam;
lpEnemy->getSprite()->stopAllActions();
this->removeChild(lpSender);
// When access the _vEnemies variable here, the exception occurs at "_vEnemies->begin()"
// I set a breakpoint here, the address of _vEnemies is invalid, but I set a breakpoint in the previous function, the _vEnemies has a valid address, what happened? I really can't comprehend the behavior. _vEnemies is the member variable of this class.
std::vector<Enemy*>::iterator iter = _vEnemies->begin();
while (iter != _vEnemies->end())
{
if (lpEnemy == *iter)
{
this->removeChild(lpEnemy->getSprite());
//delete *iter;
iter = _vEnemies->erase(iter);
continue;
}
++iter;
}
delete lpEnemy;
}
these two methods are used in two CCSchedules, which is intialized in init() method, the codes are below:
bool GameObjectsLayer::init()
{
bool bRet = false;
do
{
/* not important, omit them */
this->schedule(schedule_selector(GameObjectsLayer::updateEnemy), 5.0f);
this->schedule(schedule_selector(GameObjectsLayer::enemyShoot), 1.0f);
scheduleUpdate();
bRet = true;
}
while (0);
return bRet;
}
I got a head-ache. I don't know what happened. The version of my cocos2d-x is 2.1.5, and IDE is VS2012. Thanks for help..

Answer 1

Well, this is an old one, but for anyone who might stumble here :
The problem seems to be in this line
CCCallFuncND *lpCallback = CCCallFuncND::create(lpEnemy->getSprite(), callfuncND_selector(GameObjectsLayer::removeEnemy), lpEnemy);
The signature for this (from docs) is
static CCCallFuncND* create ( CCObject *pSelectorTarget,
SEL_CallFuncND selector,
void * d
)
*pSelectorTarget is the object on which the selector is called. So in this example it should be this instead of lpEnemy->getSprite().
Frankly, It seems a little strange to me that it didn't crash earlier.