[JASS] Little tricks about "returns" and advanced triggers

[Fire-Dragon-DoL]

Ok...i'm really new on JASS, but i create programs in c++, javascript and things like this...

i would like to do a very easy thing: take a value on a function (an integer) from a global (udg_bla) and return a real (that i will use to get the time)...i'm using WE unlimited, so i can run the function directly inside the action Wait X

that's the code that i'm trying to use...but there are something that it's not correct

function FDDspellinfoDELAY takes integer i returns real
local real R = 0.00
if i == 0 then
set R = 2.00
endif
return R
set R = null
endfunction

FIRST

set R = null it's not an action that can stay after a return (it's never read)...but i can't return a value if i do it BEFORE the return...so, what should i do for this?

SECOND

if i would like to return a TRIGGER, how to do it?(if the name of the trigger is "Bla")

thanks for helping

 

[wyrmlord]

You can't and don't need to null real values. You only need to null local handles. For a trigger, every time you create a trigger (GUI trigger), the World Editor automatically generates a global variable for it named: "gg_trg_Trigger_Name" (without quotes). In your case, the variable would be "gg_trg_Bla".

 

[Fire-Dragon-DoL]

You can't and don't need to null real values. You only need to null local handles. For a trigger, every time you create a trigger (GUI trigger), the World Editor automatically generates a global variable for it named: "gg_trg_Trigger_Name" (without quotes). In your case, the variable would be "gg_trg_Bla".

thanks a lot (i've noticed this thing after i post i was only looking for the right global )

ok ...what exactly type of data is "handle"? is it like a "general" type?

 

[paskovich]

Why do you overcomplicate the function? You don't even need the real variable:

function FDDspellinfoDELAY takes integer i returns real
if i == 0 then
return 2.00
endif
endfunction

Handles include everything that is not a real, integer, boolean, string...umm, what else?

 

[Fire-Dragon-DoL]

Why do you overcomplicate the function? You don't even need the real variable:

function FDDspellinfoDELAY takes integer i returns real
if i == 0 then
return 2.00
endif
endfunction

Handles include everything that is not a real, integer, boolean, string...umm, what else?

i complicated the function because if i put "return 2.00" (as i've done at the beginning), it sent me an error like "not a real value"(but 2.00 is a real value...bah)...

btw, that was only an example (infact inside the function i've added other things that need that variable )....

i'm thinking that it's not too hard to learn the JASS if u are a programmer...expecially because is totally documented (if u don't know the name of a function or parameters that need, reproduce it using GUI and u will have your answer )

I've created this function now (that it's runned under an IF that stops the trigger if false)

function FDDspellconsumeMANA takes integer i returns boolean
if ( GetUnitStateSwap(UNIT_STATE_MANA, GetTriggerUnit()) < FDDspellinfoMANA(i) ) then
call DisplayTimedTextToForce( GetForceOfPlayer(GetOwningPlayer(GetTriggerUnit())), 5.00, FDDsyserror(1) )
call PlaySoundBJ( gg_snd_Error )
call TriggerExecute( gg_trg_soundeffect_Delete )
call IssueImmediateOrderBJ( GetTriggerUnit(), "stop" )
return false//Skip Remeaning actions
else
call SetUnitManaBJ( GetTriggerUnit(), ( GetUnitStateSwap(UNIT_STATE_MANA, GetTriggerUnit()) - FDDspellinfoMANA(i) ) )
endif
return true
endfunction

a little question: what exactly does call???I've found it in another language (sphere to create uo servers) and this keyword PRESERVES local variables of the "called" function...is the same in warcraft?

 

[Daelin]

Why do you overcomplicate the function? You don't even need the real variable:

function FDDspellinfoDELAY takes integer i returns real
if i == 0 then
return 2.00
endif
endfunction

Handles include everything that is not a real, integer, boolean, string...umm, what else?

Ouch, this is wrong. I would be surprised if it actually worked. Why? Because you should know that functions ALWAYS need to return a value. Therefore, for i!=0 you should also return a value (let's say 0.00).

When it comes to nulling a value you want to return, simply make a global variable point to the object, nullify the local, and return the global.

-Daelin

 

[paskovich]

Yeah, yeah, you're right, i forgot it! So this one is correct, isn't it?

function FDDspellinfoDELAY takes integer i returns real
if i == 0 then
return 2.00
endif
return 0.00
endfunction


And Fire-Dragon-DoL, replace non-native functions with native ones. It makes functions run faster. And use JassCraft for coding!

 

[Fire-Dragon-DoL]

ok guys....that's a good thing to know (usually if a function don't return a value it's not a problem)...but i will put it

mh, i prefer write the code with my own hands (at the beginning, u will learn more)

after that..i've corrected everything and now my cast system is working

and it's very short (6 lines against more than 20 with GUI)

Btw i use JASS expecially because i can return values with functions (u can't do it with triggers, or u have to use a global...)

 

[Daelin]

If you're used to programming, then JASS is the thing for you. GUI is just a solution for those not capable of programming yet. After all, it gives no compile errors, only logical ones. So in my opinion, you've done the right thing. Keep up learning.

~Daelin

 

[Captain Griffen]

You don't need the '00' on the end, just '2.' would do. GUI just makes arbitarily sets everything to 2 decimal places (even though reals can go to more than that, and less than that). The decimal point is important though, as it denotes it as a real (which prevents the requirement to change it to real in game from integer).