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tabutcher

While and If Statement Question

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I found a sample script that used a while and if statment :

While 1
Local $file = FileFindNextFile($search)
If @error Then ExitLoop
WEnd

My questions are:

What is the "1" after the "while" referring to?

When does the loop know when to stop?

Is the if statment a shortend version? because it doesn't use an endif

What is @error?

any help would be greatly appreciated

thanks

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Read the help file, all will be answered within.


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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in basic @error is error returned by the previous function in case of error.

while 1 is always true and it is terminated by exit loop when condition is (@error=1) true

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in basic @error is error returned by the previous function in case of error.

while 1 is always true and it is terminated by exit loop when condition is (@error=1) true

There is an interesting topic about teaching people to fish in the Chat forum...


√-1 2^3 ∑ π, and it was delicious!

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1) "While 1" is like "While True": 1=True, 0=False.

2) The loop cannot stop by satisfying the "While" condition, so it stops when the code forces it to (i.e. when it gives the command ExitLoop). Notice that it only gives the command when @error is equal to 1, because as I said 1=True (so, for @error=1, the code becomes "If 1 Then..." which is equivalent to "If True Then..."

3) Yes, it is shortened. Instead of

If (condition) Then
(something)
EndIf
it is on a single line: If (condition) Then (something). Notice that you can only use this form when (something) has only got 1 instruction/command.

4) It is a special variable, that you can't modify (until some recent AutoIt version, with the SetError() command), that tells you if the code encountered some error or not, and sometimes tells you which kind of error.

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There is an interesting topic about teaching people to fish in the Chat forum...

I'm guessing they're not getting the subtle hints.

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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I'm just happy to see a post from GiulioM with actual substance :idiot:


√-1 2^3 ∑ π, and it was delicious!

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