Subscript out of bounds at line...

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The Zoq2

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Location: Linköping, Sweden

Posted: 6th Mar 2012 23:58

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Hi, I just ran into a weird error in my game, when I try to run the game I get the error, subscrit out of bounds at line 24 inside weapons.agc. I have no idea what it means nor any idea of how to fix it.

What does it mean and how can I get rid of it?

I have attatched the code where the errror appears

+ Code Snippet

Weapons_Load:

    Remstart
        Types used:
            RocketSpeccs
        Arrays Used
            Rocket[]
    Remend

    //Declaring the rockets "specs"

    RocketSpecs.Damage = 10
    RocketSpecs.Speed = 1

    RocketSpecs.ReloadTime = 0.3


    //Loading the rockets

    //Loading the image
    RocketSpecs.Image= LoadImage("Rocket.png")

    For i=1 to Player.RocketAmount
        Rocket[i] = CreateSprite(RocketSpecs.Image) ------- This is line 24 where the error says the problem is
            SetSpriteShape(Rocket[i], 3)
            SetSpriteScale(Rocket[i], 0.1, 0.1)
            SetSpritePositionByOffset(Rocket[i], 50, 50)
    Next i

Return

Weapons:


return

I think iv'e seen the error before but I can't remember what I did to fix it though...

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MikeMax

AGK Academic Backer

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Posted: 7th Mar 2012 00:02 Edited at: 7th Mar 2012 00:04

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it means that you're requesting an array space out of bounds.

To remember :

Dim Rocket[50] permits to go from Rocket[0] to Rocket[49] ..

So maybe you have to change to :

+ Code Snippet

For i=0 to Player.RocketAmount-1
       ...
Next i

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Marl

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Location: Bradford, UK

Posted: 7th Mar 2012 00:03 Edited at: 7th Mar 2012 00:12

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It usually means you tried to access an array beyond what you dimmed

As you didn't include the dim statements in the code it's difficult to say more than that.

Edit: 2nd past the post again

@MikeMax

You just beat me to it.

Oh and in AppGameKit, Dim Rocket[50] does actually allow from 0 to 50.

More likely Player.RocketAmount somehow got too big and so i is counting beyond the dim'd size of the array in the line with the error.

But again without seeing the dim statement, it's difficult to say why.

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The Zoq2

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Posted: 7th Mar 2012 08:34

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Thanks to you I found the problem, turns out I had typed RocketAmount instead of player.rocketamount

Thanks for the help!

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MikeMax

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Posted: 7th Mar 2012 12:35 Edited at: 7th Mar 2012 12:36

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Edit: double post sorry

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MikeMax

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Posted: 7th Mar 2012 12:35

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@ Marl

+ Code Snippet

Oh and in AGK, Dim Rocket[50] does actually allow from 0 to 50.

Ho yes you're right ... (but i consider that as an AppGameKit bug :p)

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baxslash

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Posted: 7th Mar 2012 12:39

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Quote: "Ho yes you're right ... (but i consider that as an AppGameKit bug :p)"

I consider it an opportunity! I use the zero slot to store the number of used slots so I never get this exact error message. That way you can dynamically change the size of the array on the fly too!

All of my arrays are dim'd like this:

+ Code Snippet

dim myArray[0] as integer

Also it's standard behaviour for arrays to start at zero isn't it (at least in most of the languages I've used)?

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MikeMax

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Posted: 7th Mar 2012 13:08

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To start at zero yes .. but end to [SIZE]-1 too :p not [SIZE].

A dimension of 50 means 50 slots. not 51

So yes in this case the ZERO slot can be cool to count elements. (there is no sizeof() in Tier1 ? :p)

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baxslash

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Posted: 7th Mar 2012 13:14

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I see what you mean. No there is no sizeof() in Tier 1.

I prefer using the [SIZE] value as it is personally because it works well with using an empty zero slot.

I guess it's confusing because it's half done one way and half the other. I am quite happy with how it works in Tier 1 myself.

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MikeMax

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Posted: 7th Mar 2012 13:28

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Good luck to convert Tier1 code to Tier2 with this method

You will have to redim each array to size+1 to prevent read/writes out of memory allocated

( [0 -> Size-1] is the standard on most of the languages .. (C++,Java, etc...))

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baxslash

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Posted: 7th Mar 2012 13:50

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Quote: "Good luck to convert Tier1 code to Tier2 with this method"

My guess is that if this is a problem TGC will be quite likely to find that out first since they are already doing games cross platform in AGK.

Quote: "( [0 -> Size-1] is the standard on most of the languages .. (C++,Java, etc...))"

Yes, I thought you were referring to arrays starting at zero rather than being sized in this way, my misunderstanding.

I use C# at work mainly and it has "foreach" which is a far easier method of looping through data.

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