Re: working with byte arrays

From: Mark Alexander Bertenshaw (mark.bertenshaw_at_virgin.net)
Date: 11/13/04 

Date: Sat, 13 Nov 2004 14:51:08 -0000

J French wrote:
> On Sat, 13 Nov 2004 10:31:29 +0100, "Peter" <-> wrote:
>
>> Thanks, Rick
>> I like this solution because it is simple and easy, Thanks again
>> I haven't make any performance tests yet but I could think that it
>> would be faster than my current solution because the whole
>> comparisson is done inside InstrB(no VB loop is running).
>> Thanks for the hint to check the size of the arrays, in my project
>> all bytearrays start at index 0 therefore I just need to concentrate
>> on Ubound.
>
> One thing you will find is that when compiled (not in the IDE) VB
> Loops on Byte Arrays are /astonishingly/ fast
>
> I found this when comparing timing on my Delphi file sorting DLLs, to
> my amazement using callbacks to VB was pretty much the same speed as
> pure Delphi - and Delphi is often virtually unbeatable, even in ASM as
> it uses an optimizing compiler.

And in addition to what J French said, if you go to Advanced Compile options
and check "Remove Array Bounds check", then array access will be even faster
(you *do* check bounds when necessary in your code, don't you?). 

--
Mark Bertenshaw
Kingston upon Thames
UK

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