[R] About How to check if a html directory exists

[William Dunlap]

Use try() or tryCatch() to let your loop continue looking
for more files after download.file() throws an error.

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 Rolf Turner
> Sent: Monday, April 25, 2011 3:30 PM
> To: Wendy Han
> Cc: r-help at r-project.org
> Subject: Re: [R] About How to check if a html directory exists
> 
> On 26/04/11 05:52, Wendy Han wrote:
> > Dear all,
> >
> >
> >
> > I want to let R automatically download available files from 
> a website in
> > certain folders. Since the files I need, if exist, are in a certain
> > directory, I used download.file() function with a 
> predesigned directory.
> > However, some of the folders do not have the file I want. 
> When this occurs,
> > my program returns error and terminates. So I wonder if 
> there is any way
> > that I can check if a directory exists before downloading 
> that file. I
> > appreciate your help!
> 
> Not quite sure I understand your question,  but I think that the
> file.info() function will provide what you need.  Check out 
> ?file.info.
> See also ?files and ?file.access.
> 
>      cheers,
> 
>          Rolf Turner
> 
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