[Classic] 1.13.5.35753 Spell_CancelChannel

[scimmy]

You want more lua functions reversed? I got you some more lua functions reversed.

I wanted to cancel channeling when I hit the "stop" button. So I needed to find a function that stops channeling, without doing something dumb like forcing movement to stop the channeled spell or pressing "escape". These solutions are straight up ass.

uint64_t CancelChannelOffset = 0x779D50;

Usage:

bool cancel_channel(int spell_id) {
    return reinterpret_cast<bool(__fastcall*)(int id, int flags)>(baseAddress + CancelChannelOffset)(spell_id, 40);
}

Two ways to get spell ID:

int spell_id = ActivePlayer + 0x188] + 0xA8]

OR

int spell_id = ActivePlayer + 0x19C0]

Why do I pass 40 as the second parameter? Fuck if i know, im guessing its some flags. Just pass 40 cuz that's what the game code does.

[air999]

It's not flag, it's code SPELL_FAILED_REASON.Interrupted = 40, used in spellcasts.

	public enum SPELL_FAILED_REASON: byte 
	{
		Success = 0,
		AffectingCombat = 1,
		AlreadyAtFullHealth = 2,
		AlreadyAtFullMana = 3,
		AlreadyAtFullPower = 4,
		AlreadyBeingTamed = 5,
		AlreadyHaveCharm = 6,
		AlreadyHaveSummon = 7,
		AlreadyOpen = 8,
		AuraBounced = 9,
		AutotrackInterrupted = 10,
		BadImplicitTargets = 11,
		BadTargets = 12,
		CantBeCharmed = 13,
		CantBeDisenchanted = 14,
		CantBeDisenchantedSkill = 15,
		CantBeMilled = 16,
		CantBeProspected = 17,
		CantCastOnTapped = 18,
		CantDuelWhileInvisible = 19,
		CantDuelWhileStealthed = 20,
		CantStealth = 21,
		CasterAurastate = 22,
		CasterDead = 23,
		Charmed = 24,
		ChestInUse = 25,
		Confused = 26,
		DontReport = 27,
		EquippedItem = 28,
		EquippedItemClass = 29,
		EquippedItemClassMainhand = 30,
		EquippedItemClassOffhand = 31,
		Error = 32,
		Fizzle = 33,
		Fleeing = 34,
		FoodLowlevel = 35,
		Highlevel = 36,
		HungerSatiated = 37,
		Immune = 38,
		IncorrectArea = 39,
		Interrupted = 40,
		InterruptedCombat = 41,
		ItemAlreadyEnchanted = 42,
		ItemGone = 43,
		ItemNotFound = 44,
		ItemNotReady = 45,
		LevelRequirement = 46,
		LineOfSight = 47,
		TargetLowlevel = 48,
		LowCastlevel = 49,
		MainhandEmpty = 50,
		Moving = 51,
		NeedAmmo = 52,
		NeedAmmoPouch = 53,
		NeedExoticAmmo = 54,
		NeedMoreItems = 55,
		Nopath = 56,
		NotBehind = 57,
		NotFishable = 58,
		NotFlying = 59,
		NotHere = 60,
		NotInfront = 61,
		NotInControl = 62,
		NotKnown = 63,
		NotMounted = 64,
		NotOnTaxi = 65,
		NotOnTransport = 66,
		NotReady = 67,
		NotShapeshift = 68,
		NotStanding = 69,
		NotTradeable = 70,
		NotTrading = 71,
		NotUnsheathed = 72,
		NotWhileGhost = 73,
		NotWhileLooting = 74,
		NoAmmo = 75,
		NoChargesRemain = 76,
		NoChampion = 77,
		NoComboPoints = 78,
		NoDueling = 79,
		NoEndurance = 80,
		NoFish = 81,
		NoItemsWhileShapeshifted = 82,
		NoMountsAllowed = 83,
		NoPet = 84,
		NoPower = 85,
		NothingToDispel = 86,
		NothingToSteal = 87,
		OnlyAbovewater = 88,
		OnlyDaytime = 89,
		OnlyIndoors = 90,
		OnlyMounted = 91,
		OnlyNighttime = 92,
		OnlyOutdoors = 93,
		OnlyShapeshift = 94,
		OnlyStealthed = 95,
		OnlyUnderwater = 96,
		OutOfRange = 97,
		Pacified = 98,
		Possessed = 99,
		Reagents = 100,
		RequiresArea = 101,
		RequiresSpellFocus = 102,
		Rooted = 103,
		Silenced = 104,
		SpellInProgress = 105,
		SpellLearned = 106,
		SpellUnavailable = 107,
		Stunned = 108,
		TargetsDead = 109,
		TargetAffectingCombat = 110,
		TargetAurastate = 111,
		TargetDueling = 112,
		TargetEnemy = 113,
		TargetEnraged = 114,
		TargetFriendly = 115,
		TargetInCombat = 116,
		TargetIsPlayer = 117,
		TargetIsPlayerControlled = 118,
		TargetNotDead = 119,
		TargetNotInParty = 120,
		TargetNotLooted = 121,
		TargetNotPlayer = 122,
		TargetNoPockets = 123,
		TargetNoWeapons = 124,
		TargetNoRangedWeapons = 125,
		TargetUnskinnable = 126,
		ThirstSatiated = 127,
		TooClose = 128,
		TooManyOfItem = 129,
		TotemCategory = 130,
		Totems = 131,
		TryAgain = 132,
		UnitNotBehind = 133,
		UnitNotInfront = 134,
		WrongPetFood = 135,
		NotWhileFatigued = 136,
		TargetNotInInstance = 137,
		NotWhileTrading = 138,
		TargetNotInRaid = 139,
		TargetFreeforall = 140,
		NoEdibleCorpses = 141,
		OnlyBattlegrounds = 142,
		TargetNotGhost = 143,
		TransformUnusable = 144,
		WrongWeather = 145,
		DamageImmune = 146,
		PreventedByMechanic = 147,
		PlayTime = 148,
		Reputation = 149,
		MinSkill = 150,
		NotInArena = 151,
		NotOnShapeshift = 152,
		NotOnStealthed = 153,
		NotOnDamageImmune = 154,
		NotOnMounted = 155,
		TooShallow = 156,
		TargetNotInSanctuary = 157,
		TargetIsTrivial = 158,
		BmOrInvisgod = 159,
		ExpertRidingRequirement = 160,
		ArtisanRidingRequirement = 161,
		NotIdle = 162,
		NotInactive = 163,
		PartialPlaytime = 164,
		NoPlaytime = 165,
		NotInBattleground = 166,
		NotInRaidInstance = 167,
		OnlyInArena = 168,
		TargetLockedToRaidInstance = 169,
		OnUseEnchant = 170,
		NotOnGround = 171,
		CustomError = 172,
		TooManySockets = 173,
		CantDoThatRightNow = 173,
		InvalidGlyph = 175,
		UniqueGlyph = 176,
		GlyphSocketLocked = 177,
		NoValidTargets = 178,
		ItemAtMaxCharges = 179,
		NotInBarbershop = 180,
		FishingTooLow = 181,
		ItemEnchantTradeWindow = 182,
		SummonPending = 183,
		MaxSockets = 184,
		PetCanRename = 185,
		TargetCannotBeResurrected = 186,
		Unknown = 187,
		Ok = 0xFF
	}

[ejt]

This is what I got from my research:

			if (Player_LeaveCombatMode())
				return true;

			if (!unit_->CastSpellId)
			{
				if (channeldata())
					return Spell_CancelChannel(channeldata(), 40);
				if (*AutoRepeatSpellId)
					return Spell_CancelAutoRepeat(true);
			}
			else
			{
				uint64_t v10 = Spell_SomeInfo(reinterpret_cast<object_guid**>(&unit_->SomeSpellGuid), unit_->CastSpellId, &guid(), true);

				auto v11 = *reinterpret_cast<uint32_t*>(v10 + 0x48);
				auto v12 = SpellDB_GetRow(v11);
				if (SpellDB_HasAttribute(v12, 10, 0x40000000))
					return false;

				Spell_CancelCast(v10, 1, 1, 0x1Eu);

				return true;
			}

It works well but I didn't complete my research into these functions.

[scimmy]

This is what I got from my research:

			if (Player_LeaveCombatMode())
				return true;

			if (!unit_->CastSpellId)
			{
				if (channeldata())
					return Spell_CancelChannel(channeldata(), 40);
				if (*AutoRepeatSpellId)
					return Spell_CancelAutoRepeat(true);
			}
			else
			{
				uint64_t v10 = Spell_SomeInfo(reinterpret_cast<object_guid**>(&unit_->SomeSpellGuid), unit_->CastSpellId, &guid(), true);

				auto v11 = *reinterpret_cast<uint32_t*>(v10 + 0x48);
				auto v12 = SpellDB_GetRow(v11);
				if (SpellDB_HasAttribute(v12, 10, 0x40000000))
					return false;

				Spell_CancelCast(v10, 1, 1, 0x1Eu);

				return true;
			}

It works well but I didn't complete my research into these functions.

Nice, I've basically reversed the same functions as you, but only to the point where I can call them to achieve the actions I want. Do you generally reimplement the entire lua function and call it as if you were using the Lua API?