I am trying to download a bunch of files from a server, for which I am
using download.file( ) within a for loop. The script is working fine
except until download.file hits a URL which has no file, at which
point it exits. I want to change this behavior to simple log the
failure and maintain state within the for loop and iterate to next. I
read about try / tryCatch but am having trouble understanding what/how
it does. Thanks.
#begin script
date <- as.POSIXlt(as.Date("2007-10-15", "%Y-%m-%d"))
for (i in 1:difftime(as.POSIXlt(as.Date("2007-10-15",
"%Y-%m-%d")),"2007-10-01"))
{
if (date$wday != 0 & date$wday != 6) {
datestr <- as.character(date, "%d%m%y") #make date character string
ddmmyy
url <-
paste("http://www.bseindia.com/bhavcopy/eq",datestr,"_csv.zip",sep="";)
file <- paste("C:/",datestr,"_csv.zip",sep="")
#options(show.error.messages = FALSE)
#options(warn = -1)
try(download.file(url, destfile = file, quiet = TRUE, mode = "wb"),
finally = cat("OK:",url,\n))
date <- as.POSIXlt(as.Date(date - 86400))
} else {date <- as.POSIXlt(as.Date(date - 86400))}
}
# end script
Thanks,
Vishal Belsare
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