## File: CFILE.Rd

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r-cran-rcurl 1.95-4.8-2
 12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455 \name{CFILE} \Rdversion{1.1} \alias{CFILE} \alias{CFILE-class} \alias{close,CFILE-method} \title{Create a C-level handle for a file} \description{ This function and class allow us to work with C-level \code{FILE} handles. The intent is to be able to pass these to \code{libcurl} as options so that it can read or write from or to the file. We can also do this with R connections and specify callback functions that manipulate these connections. But using the C-level FILE handle is likely to be significantly faster for large files. The \code{close} method allows us to explicitly flush and close the file from within R. } \usage{ CFILE(filename, mode = "r") } \arguments{ \item{filename}{the name of the file on disk} \item{mode}{a string specifying how to open the file, read or write, text or binary.} } \details{ This is a simple interface to the C routine \code{fopen}. } \value{ An object of class \code{CFILE} which is has a single slot name \code{ref} which is an external pointer holding the address of the FILE object in C. } \references{ Man page for \code{fopen} } \author{Duncan Temple Lang} \seealso{ \code{\link{curlPerform}} and the \code{readdata} } \examples{ \dontrun{ filename = system.file("tests", "amazon3.R", package = "RCurl") f = CFILE(filename) if(url.exists('http://s3.amazonaws.com/')) curlPerform(url = "http://s3.amazonaws.com/RRupload/duncan2", upload = TRUE, readdata = f@ref, infilesize = file.info(filename)[1, "size"]) } } \keyword{IO}