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Getscript Returns Null

#1 User is offline   niru4l 

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Posted 18 December 2011 - 09:01 AM

This is the class of my creatureai:

class PortalCreature : public MoonScriptCreatureAI
{
	MOONSCRIPT_FACTORY_FUNCTION(PortalCreature, MoonScriptCreatureAI);
	PortalCreature(Creature* pCreature) : MoonScriptCreatureAI(pCreature){
		OwnerScript = NULL;
		test = false;
		_unit->GetAIInterface()->disable_combat = true;
		_unit->GetAIInterface()->SetAllowedToEnterCombat(false);
	};

        void OnLoad()
	{
		printf(" SPAWNED MOB\n"); //Shows that script is registered
		RegisterAIUpdateEvent(1000);
	}

	void SetOwner(TowerDefenderScript * script) {OwnerScript = script;}
	TowerDefenderScript* GetOwner(){return OwnerScript;}

	
private:
	TowerDefenderScript* OwnerScript;
	bool test;
	
};


It's registered for the creature with entry 80002.

Now in the class TowerDefenderScript i have that method:

void TowerDefenderScript::SpawnCreature()
{

	uint32 _entry = 80002;
	Creature* pCreature = mInstance->CreateCreature(_entry);

	pCreature->Load(CreatureProtoStorage.LookupEntry(_entry), pGameObject->GetPositionX() + 21, pGameObject->GetPositionY(), pGameObject->GetPositionZ(), 0);
	pCreature->m_loadedFromDB = true;
	pCreature->SetFaction(1);
	pCreature->Phase(PHASE_SET, pPlayer->GetPhase());
	pCreature->m_noRespawn = true;
	pCreature->AddToWorld(mInstance);

	TO<PortalCreature*>(pCreature->GetScript())->SetOwner(this);
}


But it always crashs the server, because GetScript() returns NULL, but it shouldn't in other cases it works:

void TowerDefenderScript::SpawnVehicle()
{
	pVehicle = mInstance->CreateCreature(CREATURE_VEHICLE);

	pVehicle->Load(CreatureProtoStorage.LookupEntry(CREATURE_VEHICLE), pPlayer->GetPositionX(), pPlayer->GetPositionY(), pPlayer->GetPositionZ(), pPlayer->GetOrientation());
	pVehicle->m_loadedFromDB = true;
	pVehicle->SetFaction(pPlayer->GetFaction());
	pVehicle->Phase(PHASE_SET, pPlayer->GetPhase());
	pVehicle->m_noRespawn = true;
	pVehicle->PushToWorld(mInstance);
	pPlayer->EnterVehicle(pVehicle->GetGUID(), 200);
	//SET VEHICLE OWNER SCRIPT
	TO<TowerPlaceVehicle*>(pVehicle->GetScript())->SetOwner(this);
}


Theres no crash, the TowerPlaceVehicle class structure is equal to the one of the PortalCreature.

I hope somebody can help me, would be nice ;)
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#2 User is offline   jackpoz 

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Posted 18 December 2011 - 04:24 PM

first script code block has pCreature->AddToWorld(mInstance), 2nd code block has pVehicle->PushToWorld(mInstance). Now, if we check how the script for Creatures is loaded, we'll find it in
void Creature::LoadScript()
{
    _myScriptClass = sScriptMgr.CreateAIScriptClassForEntry(this);
}

called in
void Creature::OnPushToWorld()
{
    ....
    if(GetScript() == NULL)
    {
    	LoadScript();
    }

    Unit::OnPushToWorld();

I suggest you to take a look at the difference between AddToWorld() and PushToWorld(). As you are using GetScript(), you should also check when it is initialized and write your code on top of that.
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#3 User is offline   niru4l 

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Posted 24 December 2011 - 04:32 AM

Thank you, I should really learn to read sourcecode before asking ;)
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