[R] download.file

[Henrik Bengtsson]

See downloadFile() of the R.utils package (on CRAN);

it allows you to download to a file to a given path (without have to
"replicate" the filename), and it also have an option (the default) to
drop zero-size files that are (sometimes) created when download.file()
tries to download a non-existing file.  Moreover, the method downloads
files in binary mode by default (download in text mode is a common
cause for "corrupt" files).  See help("downloadFile",
package="R.utils") for more bells and whistles.

/Henrik

On Tue, Nov 8, 2011 at 3:32 PM, Mary Kindall <mary.kindall at gmail.com> wrote:
> I am downloading say 100 files from ucsc website and storing it into dest
> folder.
> download.file function create a file in destination folder even if the file
> is not present which is something I dont want.
> So I wrote if condition to remove the file if the download function has non
> zero value.
>
> Now it exits when there is an error or file not present. How can I use
> "try" and "if" condition together so that the program does not exit on
> error and delete the created file in destination folder.
>
> for (i in 1: 100)
> {
> fileUrl = ucscfilenames[i]
> if (download.file(fileUrl, destFile, 'wget' , quiet = TRUE) != 0)
>    {
>    file.remove(destFile)
>    }
> }
>
>
>
> thanks
>
> --
> -------------
> Mary Kindall
> Yorktown Heights, NY
> USA
>
>        [[alternative HTML version deleted]]
>
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