read.socket
Read from or Write to a Socket
Description
read.socket
reads a string from the specified socket, write.socket
writes to the specified socket. There is very little error checking done by either.
Usage
read.socket(socket, maxlen = 256L, loop = FALSE) write.socket(socket, string)
Arguments
socket | a socket object. |
maxlen | maximum length (in bytes) of string to read. |
loop | wait for ever if there is nothing to read? |
string | string to write to socket. |
Value
read.socket
returns the string read as a length-one character vector.
write.socket
returns the number of bytes written.
Author(s)
Thomas Lumley
See Also
Examples
finger <- function(user, host = "localhost", port = 79, print = TRUE) { if (!is.character(user)) stop("user name must be a string") user <- paste(user,"\r\n") socket <- make.socket(host, port) on.exit(close.socket(socket)) write.socket(socket, user) output <- character(0) repeat{ ss <- read.socket(socket) if (ss == "") break output <- paste(output, ss) } close.socket(socket) if (print) cat(output) invisible(output) } ## Not run: finger("root") ## only works if your site provides a finger daemon ## End(Not run)
Copyright (©) 1999–2012 R Foundation for Statistical Computing.
Licensed under the GNU General Public License.