Why does one scipt give an error, when I have a script using #pragma strict?

Question

I had a project that suddenly gave me errors when I started adding #pragma strict to my scripts

I removed the code not giving errors, and ended up with these two scripts:

1) PragmaScript: (yes, this is the entire script)

#pragma scrict

2) ScriptInFolder:

function Start ()
{
    var names : Array = new Array();
    names.Push("John");
    print(0 + names[0]);
}

ScriptInFolder must be in a folder and running on a gameobject. PragmaScript can be placed anywhere.

The runtime error is:

InvalidProgramException: Invalid IL code in ScriptInFolder:Start (): IL_001f: add

Why does this happen? Shouldn't javascript "fix" these things on the fly, even though I use #pragma strict in one script?

Answer 1

Best Answer

Answer by Mike 3 · Nov 03, 2010 at 06:28 PM

BCE0051: Operator '+' cannot be used with a left hand side of type 'int' and a right hand side of type 'Object'.

That's the error you'd be getting if you had #pragma strict in your second script

change it to

print("0" + names[0]);

and it should work ok

What's happening is that since you're not using #pragma strict in the second script, it's looking at the two objects and can't work out what it should do until runtime. Unfortunately it guesses wrong, and screws up when it tries to do an integer addition

Making it string + object should call .ToString() implicitly on the second object, fixing it

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Atnas1010 · Nov 03, 2010 at 06:34 PM 0

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Just as I thought things weren't going to get any stranger. The code you posted only works if I actually put #pragma strict in ScriptInFolder. If I don't do that, then I get a "IL_001e: add" error at runtime

Mike 3 · Nov 03, 2010 at 06:55 PM 0

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Heh. print("0" + names[0].ToString()); should work with both.

Atnas1010 · Nov 03, 2010 at 07:17 PM 0

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Yup it does :) But overall, with all the oddities involved I think I will report this as a bug. Also, would there be any way to declare the array to hold strings? (not builtin)

Mike 3 · Nov 03, 2010 at 08:40 PM 0

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List. names = new List.(); you'll need import System.Collections.Generic; at the top of your script

Mike 3 · Nov 03, 2010 at 09:49 PM 1

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Oh sorry - var names : List. = new List.(); my code before was half unityscript, half c# :P

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Answer 2

Answer by Ulrich · Oct 29, 2010 at 02:14 AM

try with "function Start ()" instead

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Atnas1010 · Oct 29, 2010 at 02:20 AM 0

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Is that not EXACTLY what I wrote?

Ulrich · Oct 29, 2010 at 02:23 AM 0

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Glad it works. Good luck with your game.

zannghast · Oct 29, 2010 at 02:44 AM 2

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Ulrich, I know you mean well. It's just that Atnas was pointing out that what you had suggested as an answer did not really help because what you had suggested for Atnas to use was, in fact, already being used in the script.

Answer 3

Answer by soulburner · Feb 21, 2013 at 11:19 PM

Yeah, I've just had the same error while trying to perform the following:

 string + int + int + string

the error dissappeared when I've changed it to:

 string + int + "" + int + string

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Why does one scipt give an error, when I have a script using #pragma strict?

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