Game Maker Studio 2 Variable Not Set Before Reading It

Variable "non set up before reading information technology"

• Thread starter Will
• Start date Aug 7, 2016

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Non open for further replies.

• #1

Hey anybody,

I was experimenting with a different arrangement for obtaining powers in my game when I suddenly ran into this issue that I've never seen earlier. I've been toying with the code trying to figure it out myself only I tin't seem to observe what'southward causing the event. It seems to be that the game isn't recognizing "obj_enemy.element", and for some reason returning "obj_enemy.<unknown variable>". Hither is the error message:

___________________________________________
############################################################################################
FATAL ERROR in
action number one
of Step Event0
for object obj_absorb:

Variable obj_enemy.<unknown variable>(100021, -2147483648) non gear up before reading it.
at gml_Object_obj_absorb_StepNormalEvent_1 (line 19) - getpower = obj_enemy.element;
############################################################################################

This is odd to me because the first three lines of the create outcome of obj_enemy are:

Code:

                            randomize()  var element;  element = (irandom(nine) + 1);                          

obj_enemy is always on screen in this case and obj_absorb is chosen by the push button of a button. The error occurs when obj_absorb and obj_enemy collide. If they are not colliding, everything works as expected.

Any ideas on a quick fix for this result? It's fairly late at night and I'k tired so I can't assist merely feel that I'm overlooking something pretty unproblematic.

Cheers!

• #2

You cant 'var' a variable if y'all desire to access it from another object. What var does is throw away a variable immediately after finishing the script. If someone tries to access the var variable, its too late and information technology has already been thrown away.

• #3

You lot cant 'var' a variable if you want to access it from another object. What var does is throw abroad a variable immediately afterward finishing the script. If someone tries to access the var variable, its too late and information technology has already been thrown away.

Oh. Duh. I had a hunch this was a simple oversight on my end...

Thank you!

• #iv

And afterwards y'all go some sleep, pop open the Manual entries for variable scope and read up.

I come across at to the lowest degree five or 6 topics every calendar week that are in some manner related to improper scoping, and that's 100% preventable by learning the nuts.

• #5

hay, i have the same issue but i alleged my variable without var, and i get this error : not set earlier reading information technology. Information technology is declared in the create outcome and is merely a standard variable...

• #6

hay, i have the same consequence but i declared my variable without var, and i get this error : not set up before reading it. It is declared in the create event and is but a standard variable...

this is my error message
############################################################################################
FATAL Error in
activeness number i
of Pace EventObjbrain
for object objplayer:

Variable objplayer.brians(100013, -2147483648) not set before reading it.
at gml_Object_objplayer_Collision_bc0b8895_e6d2_4bc4_9290_7595eb0963b2 (line i) - brains=brians+1;
############################################################################################
--------------------------------------------------------------------------------------------
stack frame is
gml_Object_objplayer_Collision_bc0b8895_e6d2_4bc4_9290_7595eb0963b2 (line 1)

• #7

this is my mistake bulletin
############################################################################################
FATAL ERROR in
action number 1
of Stride EventObjbrain
for object objplayer:

Variable objplayer.brians(100013, -2147483648) non set before reading it.
at gml_Object_objplayer_Collision_bc0b8895_e6d2_4bc4_9290_7595eb0963b2 (line 1) - brains=brians+1;
############################################################################################
--------------------------------------------------------------------------------------------
stack frame is
gml_Object_objplayer_Collision_bc0b8895_e6d2_4bc4_9290_7595eb0963b2 (line ane)

Cheque the spelling. (And also thank you for posting the mistake message - this is a proficient example of why y'all should ever post the error message when asking for help on the forum - and too why you should read them carefully.)

• #8

If you endeavour to read a variable: THIS = THAT

if THAT hasnt been created or set to annihilation before it will crusade this error,

if you lot practice:

var THAT;

Yous havent defined the value for it, you've only created it, and so reading it will crusade this error.

this merely applies to "var" (local variables) as said before these are only agile in the current script, ( and are the fastest to read & write )

If your in a script and exercise: THIS = THAT
and yous've done:
var THAT = x;
then THIS will equal 10, from the "var"
if THAT was previously created as a normal(permanent variable) also beforehand, and the same named variable is in the script every bit a local variable, the permanent variable is ignored and the local 1 is read instead,
this is actually actually useful in some cases

But moreover, every bit the question states, the inkling is in the question, the variable hasn't been set before reading it, of course it volition cause an error P

• #9

if yous are facing this problem in an object where yous declared the variable in create and and so try to use information technology in some other variable in the same object, so the easiest solution is to acquaintance it with the object.
like in create event of a object named "something" it should be like for example

Code:

                            var full obj_something.total=10                          

and then if yous want employ information technology any event merely write

and then do whatever operation yous want to with it

• #10

you are facing this problem in an object where you declared the variable in create and and so try to use it in another variable in the same object, then the easiest solution is to associate it with the object.
<SNIP>

NOOOOOOOOOOO! This is (and distressing to say it) absolute nonsense. @FrostyCat has already referred you to the pages in the manual that explain this and I would return the favour by additionally linking to this topic of theirs: https://forum.yoyogames.com/alphabetize.php?threads/whats-the-difference-objects-and-instances.29005/

I'm going to close this topic now, as the OP has their reply.

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Source: https://forum.yoyogames.com/index.php?threads/variable-not-set-before-reading-it.4078/

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