Hi David,
got to this link and all the other links:
http://www.microsoft.com/isapi/redir.dll?prd=ie&pver=6&ar=msnhome
Also the clear method is called when on error resume next is done so you
need not use it. but, all bets are off when Microsoft says that, but this links
describes it.
Bruce
Sent: Monday, November 04, 2013 9:00 AM
Subject: Re: Error Handling
"err.clear" does not change control flow behavior but clears the
properties of the err object, including err.number. "on error goto 0"
changes control flow behavior so that the next error, rather than
setting err properties, will abort code execution.
Beware, by the way, the exact meaning of "on error resume next": It
literally means "on error, resume on the next code line." This has
surprising implications for the following two lines:
if myvar = 1 then
and
do while ii <= n
If myvar doesn't exist, for example, the next line will run as if
myvar were 1. If ii doesn't exist, the loop would never exit. Of
course you can check for err.number inside the If and While loops to
catch this, but it's something not everyone remembers to do. Moral:
Type carefully between "on error resume next" and "on error goto 0"
lines, and at least if you think like I do, keep those sections as
short as possible.
On Mon, Nov 04, 2013 at 02:52:24PM +0100, David wrote:
Scripters,
I am a bit confused.
I have tried to search the net for different methods of error handling
in VBS, and found that there seem to be some kind of confusion going
on. Smile. At least, I can't make head and tail to a certain point
here.
I have an Error [1]http://librivox.org/podcast.xmlHandling code like
this:
On Error Resume Next
'Perform an action
If Err.Number <>0 Then
'Do something
Else
' Do something else.
End If 'Err.Number <>0.
OK, this code seems to work pretty fine, at least as long as I only
perform an error check one place in my code. Yet, if I have a similar
code further down the app, it seems as the error resuming does not
stop. So, I searched the net. And I found two instructions, that
confuses me:
1: Err.Clear
and,
2: On Error Goto 0.
Can anyone tell me which of them, I should use in my code, so as to
reset the error resuming for each time i have checked for an error?
What is the correct place to put any of these instructions? Should I
put them before, after, or even somewhere inside the Error checking
routine?
Hope all of this made any sense, and that someone please would be kind
to enlighten me.
Thanks,
References
1. http://librivox.org/podcast.xmlHandling
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