Error for varible using getArtilleryAmmo (When no ammo is present)

[Ramsen V 1]

Afternoon,

 

Probably an easy fix but I cannot find the correct solution/syntax:

 

_ammoClass = getArtilleryAmmo [_veh] select 0; // (_veh is a Zamak MRL with NO ammo left - so obviously no ammo class - this is purposely set for this fault test.)

systemchat format ["%1",_ammoClass]: // Returns <null> as expected.

if (isNull _ammoClass) then {_ammoClass = "null"}; // Do not know how to check the variable?

 

Error: _ammoClass undefined variable of course!

 

So how can I check that _ammoClass is <null>.

 

I have tried, isNil, isNull and tried setting the variable _ammoClass to nill before the check, however, whatever I do getArtilleryAmmo just overwrites the variable regardless.

 

So any help welcome. Thank you for reading!

 

Cheers.

[Harzach 2511]

You can check a variable with isNil.

 

An undefined variable will return true:

hint format ["%1", isNil "_ammoClass"];

//TRUE

A defined but "empty" variable will return true:

_ammoClass = getArtilleryAmmo [_veh] select 0;
hint format ["%1", isNil "_ammoClass"];

//TRUE

A defined variable will return false:

_ammoClass = 3; 
hint format ["%1", isNil "_ammoClass"];

//FALSE

 

[Ramsen V 1]

Thank you for your reply @Harzach

 

On 8/28/2023 at 5:31 PM, Harzach said:

You can check a variable with isNil.

 

That was exactly what I thought but then, after your post, I saw my mistake...

 

if (isNil _ammoClass) should be if (isNil "_ammoClass") in quotes!

 

....I forgot the quotes!

 

Anyway it is all working now ... interestingly the getArtilleryAmmo code also shows <null> if no gunner crew are present too.

 

Cheers.

 

SOLVED

Edited September 1, 2023 by Ramsen V
Corrected code and grammar. Crossed out erroneous information.

[Harzach 2511]

1 hour ago, Ramsen V said:

interestingly the getArtilleryAmmo code also shows <null> if no gunner crew are present too.

 

I don't get this result. A fully loaded Scorcher with no crew still returns ammo (isnIl returns false).

[Ramsen V 1]

On 8/28/2023 at 8:23 PM, Harzach said:

 

I don't get this result. A fully loaded Scorcher with no crew still returns ammo (isnIl returns false). 

 

Many apologies, I was checking the same Zamak that had no ammunition which was why the <null> was showing.

 

I have crossed out the erroneous observation so it should no longer confuse anyone.

 

Anyhow, all is working with this now.

 

Thank you again.