I managed to crash SciTe with an AutoIt error & Possible Error in Struct access?

[minxomat]

The error (?)

I was writing a pretty large script the other day when I came across unexpected errors while accessing structs via the period operator.

1. Create an array containing structs (can be different structs, simplified here):

Local $T = DllStructCreate
Local $aStr[] = [$T("int x;int y"), $T("int x;int y")]
$aStr[0].x = 1
$aStr[0].y = 2
$aStr[1].x = 3
$aStr[1].y = 4

2. Working: Simple access via With:

With $aStr[0]
   .y += .x - $aStr[1].x / .y ^ 2               ; $aStr[1] is a valid reference
EndWith

3. ERROR: Use struct element as Array index, simplified:

With $aStr[0]
   .y += .x - $aStr[.x].x / .y ^ 2
EndWith

produces:

==> Variable subscript badly formatted.:
.y += .x - $aStr[.x].x / .y ^ 2
.y += .x - $aStr[.x].x / .y ^ ^ ERROR

4. ERROR: Struct element as Array index, complex:

With $aStr[0]
   .y += .x + ((Sqrt(Abs($aStr[1].x^2+$aStr[.x].y^2))-$aStr[1].x)/.y)*.y
EndWith

produces:

==> Unbalanced brackets in expression.:
.y += .x + ((Sqrt(Abs($aStr[1].x^2+$aStr[.x].y^2))-$aStr[1].x)/.y)*.y
.y += .x + ((Sqrt(Abs($aStr[1].x^2+$aStr[^ ERROR

5. ERROR: Struct element as Array index, outside of any With:

Function($aStr[$aStr[0].x].y)

Func Function($nP)
   Return Default
EndFunc

produces:

==> Unbalanced brackets in expression.:
Function($aStr[$aStr[0].x].y)
Function($aStr[^ ERROR

 

Crashing SciTe

Now, this is a abstract example of this error. But in my script, AutoIt executed the script, then aborted with an error (not warning). I tried to jump to the error within SciTe using F4. That is when SciTe itself crashed with a memory exception ("SciTe.exe does not respond blah blah..."). This happend every time and I was able to reproduce this on different PCs. I lost the script however. I will try to recreate it ;-)

 

Example

You can download a script for testing. Remove the "#" to test each line.  Download: refer.au3.

Edited May 15, 2015 by minx

[minxomat]

Also strange: The error pointer "^" is always on the wrong character.

[Jos]

Which version of SciTE are you using?

Jos

[minxomat]

SciTE Lite 3.4.1 (the one included in the latest stable)

Edit: This also happened with SciTE4Au3

Edited May 15, 2015 by minx

[Jos]

Let me know when you have a way to replicate it so I can have a look.

Jos

[minxomat]

Let me know when you have a way to replicate it so I can have a look.

Jos

​I guess it is not a SciTE problem. I assume AutoIt runs in the memory of SciTE when executed via F5? Then it should be an error in the AutoIt Interpreter (caused by the bug above).

[bernd670]

Hello,

try it this way.

With $aStr[0]
   .y += .x - ($aStr[.x]).x / .y ^ 2
EndWith

With $aStr[0]
   .y += .x + ((Sqrt(Abs($aStr[1].x^2+($aStr[.x]).y^2))-$aStr[1].x)/.y)*.y
EndWith

Function($aStr[($aStr[0].x)].y)

 

[minxomat]

Hello,

try it this way.

With $aStr[0]
   .y += .x - ($aStr[.x]).x / .y ^ 2
EndWith

With $aStr[0]
   .y += .x + ((Sqrt(Abs($aStr[1].x^2+($aStr[.x]).y^2))-$aStr[1].x)/.y)*.y
EndWith

Function($aStr[($aStr[0].x)].y)

 

​This is merely a workaround, not clean code.

[bernd670]

What's not a clean code here?

With the brackets but only the priority of the operator is changed. This is done in many languages so!

Edited May 16, 2015 by bernd670

[guinness]

Maybe I missing something, but when did dot notation work on DllStructCreate in the stable version?

[minxomat]

Maybe I missing something, but when did dot notation work on DllStructCreate in the stable version?

 v3.3.12.0​ aka the latest. Quite some time.

https://www.autoitscript.com/cgi-bin/getfile.pl?autoit3/autoit-v3-setup.exe

Edited May 16, 2015 by minx

[minxomat]

What's not a clean code here?

With the brackets but only the priority of the operator is changed. This is done in many languages so!

​No it isn't. () in AutoIt is "convert to expression". The value of .x should be directly accessible, the priority is completely irrelevant here

[guinness]

 v3.3.12.0​ aka the latest. Quite some time.

https://www.autoitscript.com/cgi-bin/getfile.pl?autoit3/autoit-v3-setup.exe

​When using With...EndWith, but again I ask, where in the changelog does it say you can do ... $aStr[0].x = 1? Honestly, I believe this to still be an experimental feature, from my limited understanding of course.

 

 

[minxomat]

​When using With...EndWith, but again I ask, where in the changelog does it say you can do ... $aStr[0].x = 1? Honestly, I believe this to still be an experimental feature, from my limited understanding of course.

​Hm. It's enabled in the stable, so it should not produce unrelated errors (IMHO). It isn't mentioned in the Help file, but it is there.

[Melba23]

minx,

It's enabled in the stable, so it should not produce unrelated errors (IMHO). It isn't mentioned in the Help file, but it is there.

That is a complete non sequitur. If something is not mentioned in the Help file then it is not even "Experimental" and should not be used under any circumstances - even if it apparently "works" in some cases.  So complaining that there are problems when using it is unlikely to get any response other than the one I have just given.

M23