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PGWARE
Web Host
Joined: 29 Dec 2001
Posts: 1564
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 Posted: Thu Oct 09, 2003 11:27 pm Post subject: try, except, end |
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Would like to see a way to capture errors similar to how in Delphi you can do -
try
{execute some code here}
except
{an error has occurred; do something or nothing}
end;
Where you can wrap your code in VDS with a TRY and attempt some code, if any error occurs it jumps to the Except section and runs code if any is there. |
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CodeScript
Moderator Team
Joined: 08 Jun 2003
Posts: 1060
Location: India
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| Posted: Fri Oct 10, 2003 1:47 am Post subject: |
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I am not sure but I think Option errortrap does something similar ?
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- CodeScript
 Give your application a professional look with the VDSGUI Extension |
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Garrett
Moderator Team
Joined: 04 Oct 2001
Posts: 2149
Location: A House
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| Posted: Fri Oct 10, 2003 7:58 am Post subject: |
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Yeah, I use the OPTION ERRORTRAP myself.. In there, if I can't anticipate
a possible error, I offer the user the option of trying the operation over
again, or shutting the program down. Though I have had one problem with
that in one program..... The errortrap itself got caught in a perpetual loop
and had to be CTRL+ALT+DEL'd. 
-Garrett
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CodeScript
Moderator Team
Joined: 08 Jun 2003
Posts: 1060
Location: India
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| Posted: Fri Oct 10, 2003 8:03 am Post subject: |
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The biggest headache is once you call option errortrap :
It is not local to a sub/function.
You cannot switch it off either .
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jules
Professional Member
Joined: 14 Sep 2001
Posts: 1043
Location: Cumbria, UK
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| Posted: Fri Oct 10, 2003 9:41 am Post subject: |
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| CodeScript wrote: | | You cannot switch it off either . |
Yes you can.
| Code: | | OPTION ERRORTRAP <blank> |
I use this all the time to provide try...except functionality. A true try...except wouldn't be possible in VDS because the language has no structure, any non-sequential of control has to be a command that branches to a label.
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Serge
Professional Member
Joined: 04 Mar 2002
Posts: 1480
Location: Australia
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| Posted: Fri Oct 10, 2003 9:51 am Post subject: |
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good tip jules 
serge
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CodeScript
Moderator Team
Joined: 08 Jun 2003
Posts: 1060
Location: India
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| Posted: Fri Oct 10, 2003 11:07 am Post subject: |
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Thanks for the Tip Jules.
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Vic D'Elfant
Past Contributor
Joined: 26 Jun 2002
Posts: 673
Location: The Netherlands
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| Posted: Sat Oct 11, 2003 1:17 pm Post subject: |
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Something like this would be cool to:
| Code: |
<?php
$var = 'myvar';
switch($var)
{
case 'hello'
print "Hy folks!";
break;
case 'myvar'
print "Hello!";
break;
}
?> |
Vic
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jules
Professional Member
Joined: 14 Sep 2001
Posts: 1043
Location: Cumbria, UK
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| Posted: Sat Oct 11, 2003 1:30 pm Post subject: |
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Again, I achieve this sort of functionality by using a goto %%var with an option errortrap to handle the "else" option of %%var not equalling any label.
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Skit3000
Admin Team
Joined: 11 May 2002
Posts: 2166
Location: The Netherlands
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| Posted: Sat Oct 11, 2003 2:53 pm Post subject: |
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| Vic wrote: | Something like this would be cool to:
| Code: |
<?php
$var = 'myvar';
switch($var)
{
case 'hello'
print "Hy folks!";
break;
case 'myvar'
print "Hello!";
break;
}
?> |
Vic |
Here it is...
| Code: | %%var = "myvar"
if @equal(%%var,hello)
info Hy folks!
elsif @equal(%%var,myvar)
info Hello!
end |
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Skit3000
Admin Team
Joined: 11 May 2002
Posts: 2166
Location: The Netherlands
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| Posted: Sat Oct 11, 2003 3:11 pm Post subject: |
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Here it is as some functions and commands:
| Code: | rem --- Include this in your scripts... ---
#define command,switch,break
#define function,switch,case
rem --- Main script ----
%%variable = hello
rem Set the variable which will be 'switched'
switch %%variable
rem If the switched variable's value is 'hello', do this:
if @case(hello)
info "%%variable : hello"
end
rem If the switched variable's value is 'hi', do this:
if @case(hi)
info "%%variable : hi"
end
rem With the @switch() function you can get the value of the switched variable...
info The value of the variable which is switched : @switch()
break
exit
rem --- Include this in your scripts... ---
:Switch
if @unequal(%1,)
%%CaseValue = @trim(%1)
else
exit %%CaseValue
end
Exit
:Case
if @equal(%2,EXACT)
Exit @equal(%1,%%CaseValue,EXACT)
else
Exit @equal(%1,%%CaseValue)
end
:Break
%%CaseValue =
Exit |
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[ Add autocomplete functionality to your VDS IDE windows! ]
Voor Nederlandse beginners met VDS: bekijk ook eens deze tutorial! |
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