Autocast casting problem

[Frizz.Meister]

I have a simple orb ability based off poison arrows. It deals damage equal to the users agility, and worked fine. However it wouldnt fire when auto-cast. I used the auto-cast tutorial and it all makes sense. Except 1 area.

function InitTrig_Auto_Attack takes nothing returns nothing
set gg_trg_Auto_Attack = CreateTrigger( )
call TriggerRegisterAnyUnitEventBJ(gg_trg_Auto_Attack, EVENT_PLAYER_UNIT_ATTACKED)
call TriggerRegisterUnitEvent(gg_trg_Auto_Attack,u, EVENT_UNIT_SPELL_EFFECT)
call TriggerAddCondition(gg_trg_Auto_Attack, Condition(function Auto_Attack_Detect))
call TriggerAddAction(gg_trg_Auto_Attack, function Auto_Attack_Detect_Actions)
endfunction

I understand the function entirely except for the second line." call TriggerRegisterUnitEvent(gg_trg_Auto_Attack,u, EVENT_UNIT_SPELL_EFFECT) "

What unit is u? As no local is declared and surely a global would prevent the trigger being MUI.

 

[WolfieeifloW]

'u' is a unit you've set.

native TriggerRegisterUnitEvent takes trigger whichTrigger, unit whichUnit, unitevent whichEvent returns event

 

[Frizz.Meister]

But which unit and how? global,local?

The tutorial i followed is http://world-editor-tutorials.thehelper.net/cat_usersubmit.php?view=41266

 

[WolfieeifloW]

It's a global unit since there's not a local in that function.

It said something about a first tutorial;
I don't know if it relates but..

You could also just ask emjlr3 himself .