[R] download files using ftp: avoid error

[William Dunlap]

Wrap the call that may abort with try() or tryCatch().

Bill Dunlap
Spotfire, TIBCO Software
wdunlap tibco.com 

> -----Original Message-----
> From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org] On Behalf Of Rainer
> Schuermann
> Sent: Friday, September 16, 2011 1:09 PM
> To: r-help at r-project.org
> Subject: Re: [R] download files using ftp: avoid error
> 
> I haven't tested it thoroughly but what worked here is replacing
> > download.file(url, destfile, quiet = FALSE)
> with
> 
> sys_call <- paste( "wget", url, ">", destfile, sep=" " )
> system( sys_call )
> 
> Program execution continues, whether or not the download from url was
> successful. However, wget is, I believe, not available on Windows.
> 
> Rgds,
> Rainer
> 
> 
> On Friday 16 September 2011 15:07:15 Mary Kindall wrote:
> > I am planning to download a large number of files from some website. I am
> > using the following script.
> >
> > files2down = c('aaa', 'bbb', ................)
> > for (i in 1: len)
> > {
> > print(paste('downloading file', i, ' of total ', len));
> > url = paste(urlPrefix, files2down[i], sep='')
> > destfile = paste (dest, 'inDir', files2down[i], sep='/' )
> > download.file(url, destfile, quiet = FALSE)
> > }
> >
> > It works fine as long as the file is present. When the file is not present,
> > it exit from loop. Is there a way to continue looping if error occurs.
> > Thanks
> 
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