TheDcoder

Why can't we append Null to a string?

11 posts in this topic

Here is some code:

ConsoleWrite("Test" == "Test" & Null) ; This should be False by theory, but it is True in AutoIt
Sleep(1000) ; Sometime for you to read the result

 

Is this a bug or expected behaviour? Thanks in Advance, TD :)


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According to the help file keyword Null always evaluates to Null or an empty string:

"Null evaluates only to Null, still in mathematical operations this keyword has value of 0, and as string it has no value (empty string)."

So - as always - the help file is your friend ;)

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What do you need it for? What do you expect?
Do you want to terminate a string with a null character?


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Forgot about the helpfile, Thanks @water! :D


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@water I need to convert a string (with Nulls as delimiters) to Base64.


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If I hurt you, Please accept my apologies, I never (regardless of the situation) mean to hurt anybody!!!

Also, I am very busy with my project so I will appear in the last row of the online list, if you want to contact me: Email@TheDcoder.xyz

Or you can have a nice chat with me in freenode, I use the same nick on freenode too!

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Glad to be of service :) I always like to solve such easy challenges ;)


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ExcelChart (2015-04-01 - Version 0.4.0.0) - Download - General Help & Support - Example Scripts
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#7 ·  Posted (edited)

Null has a broad semantic. It essentially means "I don't know" value (or rather "non value"). That's pretty formal in SQL but in AutoIt Null can get converted to some other type as Water quoted.

I believe you're confusing the Null value (keyword) with the ANSI control character NUL which is 0x00 exactly with string datatype. So you seem to want something like $sMyString &= Chr(0)

Edited by Jos
Changed Asc to Chr

This wonderful site allows debugging and testing regular expressions (many flavors available). An absolute must have in your bookmarks.
Another excellent RegExp tutorial. Don't forget downloading your copy of up-to-date pcretest.exe and pcregrep.exe here
RegExp tutorial: enough to get started
PCRE v8.33 regexp documentation latest available release and currently implemented in AutoIt beta.

SQLitespeed is another feature-rich premier SQLite manager (includes import/export). Well worth a try.
SQLite Expert (freeware Personal Edition or payware Pro version) is a very useful SQLite database manager.
An excellent eBook covering almost every aspect of SQLite3: a must-read for anyone doing serious work.
SQL tutorial (covers "generic" SQL, but most of it applies to SQLite as well)
A work-in-progress SQLite3 tutorial. Don't miss other LxyzTHW pages!
SQLite official website with full documentation (may be newer than the SQLite library that comes standard with AutoIt)

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@jchd Ah, no. I just tried it... :(


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Or you can have a nice chat with me in freenode, I use the same nick on freenode too!

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Sorry @czardas but I am a little confused, please refer to this topic:

 


AutoIt.4.Life Clubrooms - Life is like a Donut (secret key)

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My contributions to the AutoIt Community

Some messages & Apologizes:

If I hurt you, Please accept my apologies, I never (regardless of the situation) mean to hurt anybody!!!

Also, I am very busy with my project so I will appear in the last row of the online list, if you want to contact me: Email@TheDcoder.xyz

Or you can have a nice chat with me in freenode, I use the same nick on freenode too!

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PLEASE JOIN ##AutoIt AND HELP THE IRC AUTOIT COMMUNITY!

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Just now, TheDcoder said:

but I am a little confused

Only a little ? :)

Closing this thread to avoid 2 discussions on the same thing.


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