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Try/Catch - Library
Posted: Sun Aug 17, 2003 7:44 pm
by Rings
Try/Catch - Library , first version released now!
This new Library (with only 2 commands) is an enhancement to the OnError-library from Purebasic.
Introduction:
If you are familar with Java or C++, you remember the Errorhandling via Try-Catch-Finally Commands.
For Example
Code: Select all
Try{
CopyMemory();}
Catch{
printf("error");}
Finaly{};
This Try-Catch-Construct works in that way:
If CopyMemory fails, the Printf-procedure is called.
And that is the same way it works in Purebasic now.
Code: Select all
If TryError()
CopyMemory(1,0,10)
else
Messagerequester("Info","CopyMemory fails",0)
endif:EndTryError()
The TryError() and EndTryError() can be interlocked.
There is no real Helpffile available for those 2 new commands, but they are easy to use .
Download: http://home.pages.at/purefan/libraries/ ... ycatch.zip
Another example:
Code: Select all
If TryError() ;The Try-section begins
Null.l=0
Ergebnis.l = 123 / Null
Else ;Catch-Section,
Debug "Division by zero!"
EndIf:EndTryError()
we hope to the future,that if Purebasic has Macro-capacities, this commands can been renamed to the originals.
Using the library is easy, less bloated(1Kb in exe) and its freeware (Pure 3.7.x is recommented)
The TryCatch-Library is written and (c) by PureFan and some Parts by me ,Siegfried Rings . Have fun tackling Errors !
Posted: Mon Aug 18, 2003 7:41 am
by gnozal
Very usefull !
Thank you.
Posted: Mon Aug 18, 2003 11:04 am
by Rings
if you encountered any problems, please post a message here.Else this lib will been officall and in 2 weeks posted to the resourcesite and purearea.net .
Posted: Tue Aug 19, 2003 6:42 am
by Tranquil
Nice Lib Rings!! Thanks for sharing this. Great work!
Cheers
Mike
Posted: Sat Aug 23, 2003 6:30 am
by Paul
Very nice library Rings.
The problem I have is that it does not function correctly in a Procedure ;(
Try this:
Code: Select all
Procedure.l Test()
Result=0
If TryError() ;This line starts the Try-Section
Result+1
Debug "Just entered the try section"
CopyMemory(1,2,1)
Debug "This line will never execute"
Else
Result+2
Debug "Just entered the catch section"
EndIf:EndTryError()
ProcedureReturn Result
EndProcedure
Debug Test()
It should return something other than 0
Re: Try/Catch - Library
Posted: Sat Aug 23, 2003 9:04 am
by PB
Code: Select all
If TryError()
CopyMemory(1,0,10)
else
Messagerequester("Info","CopyMemory fails",0)
endif:EndTryError()
I don't understand... what's the difference between the above, and this:
Code: Select all
If CopyMemory(1,0,10)=0
Messagerequester("Info","CopyMemory fails",0)
EndIf
There is one !
Posted: Sat Aug 23, 2003 9:40 am
by DominiqueB
The main difference is that when running as an .exe, if you fall into fatal error (ex: div by 0) with "try" you keep control on your prog and can manage the error.
Without it your app will simply crash !
That makes a big difference for me...
Dominique.
Re: Try/Catch - Library
Posted: Sat Aug 23, 2003 9:45 am
by sec
I don't understand... what's the difference between the above, and this:
i don't have soure of try/cacth but think this lib use SEH handle,
i also see a good link about SEH :
here
HTH
Re: There is one !
Posted: Sat Aug 23, 2003 2:30 pm
by PB
Okay, I now understand that the Try library will stop a fatal error, but
doesn't that mean heaps of Try...EndTry routines in your code? Why
not, for example, just check for div/0 manually, etc? I don't see any
real advantages to doing normal error-checking by the programmer?
For example, why are you doing this:
Code: Select all
If TryError() ;The Try-section begins
Null.l=0
Ergebnis.l = 123 / Null
Else ;Catch-Section,
Debug "Division by zero!"
EndIf:EndTryError()
Instead of this:
Code: Select all
Null.l=0
If Null=0
Debug "Division by zero!"
Else
Ergebnis.l = 123 / Null
EndIf
Seems like a lot of extra typing when using Try...EndTry?
(BTW Rings: I'm not trashing your library, I'm just genuinely interested
in why it needed to be written in the first place).
Posted: Sat Aug 23, 2003 4:46 pm
by Rings
Paul: i will take a look, seems a stack-issue
Sec: Of course its SEH (Structured ExceptionHandling), also in the OnErrorLib
PB: there are sometimes moments in codings where not all errors are catched before with an IF Endif
Also take a look into the OnErrolib, which is in some cicumstance better than this TryCatch construct.
And you're right, better coders check their functions-result.so this is sometimes usefull for the lazy-ones .
Posted: Mon Aug 25, 2003 1:17 pm
by Rings
As for the stack-problem(thx paul for the report), its fixed now.
So this lib can also been used in a procedure
download at
http://home.pages.at/purefan/libraries/ ... ycatch.zip
same adress as above
Re: Try/Catch - Library
Posted: Tue Jul 31, 2012 7:18 pm
by jassing
Any chance anyone has the zip file still? or links that work?
Re: Try/Catch - Library
Posted: Tue Jul 31, 2012 7:38 pm
by Andre
jassing wrote:Any chance anyone has the zip file still? or links that work?
From my website:
http://www.purearea.net/pb/download/use ... ycatch.zip
Re: Try/Catch - Library
Posted: Tue Jul 31, 2012 10:03 pm
by jassing
Thanks -- will give it a go -- I found my sourcecode version of try/catch was generating failures on win7...
-j
Re: Try/Catch - Library
Posted: Tue Jul 31, 2012 11:44 pm
by Tenaja