From: Stefano Crocco <stefano.crocco@...>
Date: 2008-08-18T23:40:39+09:00
Subject: Re: how to move on to next url if current one is a dud

On Monday 18 August 2008, Adam Akhtar wrote:
> hmm wasnt too sure how to make the subject both concise and
> understandable at the same time so my apologies if i was vague.
>
> I searched under "ignore missing" but didnt come up wiht anything.
> Perhaps someone can help me.
>
> Im using open-uri to fetch the html from various ebay webpages.
> Basically the results for certain categories. I have all the relevant
> urls tucked into an array of hashes eg. Computers =>
> www.ebay.blah.blah.blah
>
> I then cycle through the array feeding open uri the urls and doing my
> biz on the html one by one.
>
> However sometimes there are no products for a certain category for that
> given day (im focussing on products located in japan so the number of
> results is drastically reduced) so when open uri complains like this
>
> ebay.rb:71:in `read': No such file or directory -
> http://research.ebay.co.uk/ws/
> search/GetSaleAnalysis?sojs=0&salic=104&sacqyop=9&sacqy=1000&sacat=13851&ft
>rv=17
> &fis=2&fts=-1&fn=4&frts=0&sc=AvgSoldPrice&showdiag=0&soexpand=1&soraw=0
> (Errno::
> ENOENT)
>
> Im fine with it complaining but it stops the programme. How do i make it
> simply skip/ignore such urls and move on to the next one in the hash?
>
> any help greatly appreciated.

Wrapping the call to open in a begin/rescue pair should do what you want:

begin open( url )
rescue SystemCallError
end

I hope this helps

Stefano