Mbee

Curious problem with UBound for a multi-dim array?

4 posts in this topic

#1 ·  Posted (edited)

I don't understand why a UBound call isn't working correctly in one specific context (which I'll show below). But here's a test example where it's working perfectly:

#include <Array.au3>
#include <Constants.au3>
#include <StaticConstants.au3>
#include <Misc.au3>
#include <String.au3>
#include <StringConstants.au3>


Local $aArray[47][4]
Local $iNumRows = UBound($aArray, $UBOUND_ROWS)
Local $iNumCols = UBound($aArray, $UBOUND_COLUMNS)
Local $iNumDims = UBound($aArray, $UBOUND_DIMENSIONS)
Local $iSecondDimSize1 = UBound($aArray, 1)
Local $iSecondDimSize2 = UBound($aArray, 2)
;
MsgBox($MB_OK, "Array Dims", "$UBOUND_ROWS=" & $iNumRows & ", $UBOUND_COLUMNS=" & $iNumCols & ", $UBOUND_DIMENSIONS=" & $iNumDims & _
                ", iSecondDimSize1=" & $iSecondDimSize1 & ", iSecondDimSize2=" & $iSecondDimSize2)
Exit

The key datum that I need is returned by that final call, UBound($aArray, 2), to get the number of elements in the second dimension.  There it works perfectly.  But when I try it with a globally declared 2D array, as follows, UBound($aArray, 2) returns the same value as UBound($aArray, 1), which is WAY wrong.  Here's the code snippet where it malfunctions:

Func _MyAdjustFileInfoAra()
    Local $Lf_NumRows = UBound($G_FileListInfoAra, $UBOUND_ROWS)
    Local $Lf_NumCols = UBound($G_FileListInfoAra, $UBOUND_COLUMNS)
    Local $Lf_2ndDimSize = UBound($G_FileListInfoAra, 2)

Where that last call returns a very wrong value.  What's going on?  Weird, huh? Does it have something to do with the fact that it's global?

 

ETA: (Yes, the global array is already declared and filled before this)

Edited by Mbee
Added comment

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Instead of saying it's already declared, you need to show where it's declared and how. Right now you're asking us to recreate your script to troubleshoot a problem you're having that hasn't been reported previously. Without a working demonstration of the problem no one can diagnose it for you.


If I posted any code, assume that code was written using the latest release version unless stated otherwise. Also, if it doesn't work on XP I can't help with that because I don't have access to XP, and I'm not going to.
Give a programmer the correct code and he can do his work for a day. Teach a programmer to debug and he can do his work for a lifetime - by Chirag Gude
How to ask questions the smart way!

I hereby grant any person the right to use any code I post, that I am the original author of, on the autoitscript.com forums, unless I've specifically stated otherwise in the code or the thread post. If you do use my code all I ask, as a courtesy, is to make note of where you got it from.

Back up and restore Windows user files _Array.au3 - Modified array functions that include support for 2D arrays.  -  ColorChooser - An add-on for SciTE that pops up a color dialog so you can select and paste a color code into a script.  -  Customizable Splashscreen GUI w/Progress Bar - Create a custom "splash screen" GUI with a progress bar and custom label.  -  _FileGetProperty - Retrieve the properties of a file  -  SciTE Toolbar - A toolbar demo for use with the SciTE editor  -  GUIRegisterMsg demo - Demo script to show how to use the Windows messages to interact with controls and your GUI.  -   Latin Square password generator

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#3 ·  Posted (edited)

I apolgize, I didn't realize that was important. Is the following all you need, or should I post more?

Global $G_FileListInfoAra[1][4]

; The size of the first dimension is ReDimmed prior to the problem code.  Let's say...
ReDim G_FileListInfoAra[47][4]

Otherwise, there are about 2 thousand lines of code in my app. Surely you don't want me to post it all, correct?

Edited by Mbee

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Post a reproducer script that demonstrates the issue. I don't need your whole script, just a runnable working script that shows the problem.


If I posted any code, assume that code was written using the latest release version unless stated otherwise. Also, if it doesn't work on XP I can't help with that because I don't have access to XP, and I'm not going to.
Give a programmer the correct code and he can do his work for a day. Teach a programmer to debug and he can do his work for a lifetime - by Chirag Gude
How to ask questions the smart way!

I hereby grant any person the right to use any code I post, that I am the original author of, on the autoitscript.com forums, unless I've specifically stated otherwise in the code or the thread post. If you do use my code all I ask, as a courtesy, is to make note of where you got it from.

Back up and restore Windows user files _Array.au3 - Modified array functions that include support for 2D arrays.  -  ColorChooser - An add-on for SciTE that pops up a color dialog so you can select and paste a color code into a script.  -  Customizable Splashscreen GUI w/Progress Bar - Create a custom "splash screen" GUI with a progress bar and custom label.  -  _FileGetProperty - Retrieve the properties of a file  -  SciTE Toolbar - A toolbar demo for use with the SciTE editor  -  GUIRegisterMsg demo - Demo script to show how to use the Windows messages to interact with controls and your GUI.  -   Latin Square password generator

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