Thanks Steven again! I have to say that these codes are fairly sophisticated to me, but I enjoy using already!
BC On Tue, Nov 30, 2010 at 12:02 PM, steven mosher <mosherste...@gmail.com> wrote: > No problem, you can also get the directory with a curlOption of dirlistonly > > see the example code in the package. This will depend on the version of > libcurl that you have. > > If you have an older version, my code will get you the directory. > > From the Rcurl examples: > > the files within a directory. > url = > 'ftp://ftp.wcc.nrcs.usda.gov/data/snow/snow_course/table/history/idaho/' > filenames = getURL(url, ftp.use.epsv = FALSE, dirlistonly = TRUE) > > # Deal with newlines as \n or \r\n. (BDR) > # Or alternatively, instruct libcurl to change \n's to \r\n's for us with > crlf = TRUE > # filenames = getURL(url, ftp.use.epsv = FALSE, ftplistonly = TRUE, crlf = > TRUE) > filenames = paste(url, strsplit(filenames, "\r*\n")[[1]], sep = "") > con = getCurlHandle( ftp.use.epsv = FALSE) > contents = sapply(filenames[1:5], getURL, curl = con) > names(contents) = filenames[1:length(contents)] > > > On Tue, Nov 30, 2010 at 9:56 AM, Baoqiang Cao <bqcaom...@gmail.com> wrote: >> >> Thanks Steven! >> It is excellent code indeed! >> >> On Tue, Nov 30, 2010 at 11:26 AM, steven mosher <mosherste...@gmail.com> >> wrote: >> > I would use RCurl. >> > >> > if you have, for example, the url of an ftp site you can merely do a >> > getURL() and the contents will be returned. That call will return data >> > that >> > can be coerced into a data.frame that will look like a directory >> > structure >> > listing the file names. >> > >> > If you need code just ask, but the RCurl docs are pretty good. >> > >> > >> > >> > On Tue, Nov 30, 2010 at 8:10 AM, Baoqiang Cao <bqcaom...@gmail.com> >> > wrote: >> >> >> >> Hi, >> >> >> >> I'd like to download some data files from a remote server, the problem >> >> here is that some of the files actually don't exist, which I don't >> >> know before try. Just wondering if a function in R could tell me if a >> >> file exists on a remote server? I searched this mailing list and after >> >> read severals mails, still clueless. Any help will be highly >> >> appreciated. >> >> >> >> B.C. >> >> >> >> ______________________________________________ >> >> R-help@r-project.org mailing list >> >> https://stat.ethz.ch/mailman/listinfo/r-help >> >> PLEASE do read the posting guide >> >> http://www.R-project.org/posting-guide.html >> >> and provide commented, minimal, self-contained, reproducible code. >> > >> > > > ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
