search for: isopen

...ks well (fast). I don't know if I have to free the memory or something. Here you have the code: R server: FSsocket <- function(){ continue = TRUE; while(continue){ conn <- try(socketConnection(server = TRUE, port = 7890, blocking = TRUE, open = "ab"), silent = FALSE); isOpened = !inherits(conn, "try-error"); isOpened = isOpened && isOpen(conn); while(!isOpened){ Sys.sleep(1); conn <- try(socketConnection(server = TRUE, port = 7890, blocking = TRUE, open = "ab"), silent = FALSE); isOpened = !inherits(conn, "try-error&...

As far as I can tell, 'isOpen' cannot return FALSE in the case when 'rw = ""'. If the connection has already been closed by 'close' or some other function, then isOpen will produce an error. The problem is that when isOpen calls 'getConnection', the connection cannot be found and 'g...

Hello, >From the doc, it says: "isOpen returns a logical value, whether the connection is currently open." But actually it seems to die on closed connections: > con <- file() > isOpen(con) [1] TRUE > close(con) > isOpen(con) Error in isOpen(con) : invalid connection Is it expected ? Tested on R-3.0.2 and R version...

...ooks like it happens in as.character.srcref's call to getSrcLines, which has some logic I don't understand about closing 'srcfile' on exit only if !.is.Open(srcfile): > getSrcLines function (srcfile, first, last) { if (first > last) return(character(0L)) if (!.isOpen(srcfile)) on.exit(close(srcfile)) conn <- open(srcfile, first) lines <- readLines(conn, n = last - first + 1L, warn = FALSE) srcfile$line <- first + length(lines) return(lines) } (It looks like the srcref stuff is not finished yet, as there are other problems, like...

Hi! I'm wondering if there's a smart way around this: fileName= (some valid file on your system) > fileCon=file(fileName, open="rt") > l<-readLines (fileCon, n= 1) > > isOpen(fileCon) [1] TRUE > close(fileCon) > isOpen(fileCon) Error in isOpen(fileCon) : invalid connection How do you test for a file being closed if isOpen gives you an error message? Thanks! -Jim

Dear all, I do not completely understand following behaviour : > con <- file("test.txt") > isOpen(con) [1] FALSE > open(con) > isOpen(con) [1] TRUE > close(con) > isOpen(con) Error in isOpen(con) : invalid connection > str(con) Classes 'file', 'connection' atomic [1:1] 3 ..- attr(*, "conn_id")=<externalptr> Why do I get an error, indicating an...

> # creating a file > cat("sddfasdf", file="tempfile") > showConnections() class description mode text isopen can read can write > con <- file("tempfile", "r") > readLines(con) [1] "sddfasdf" Warning message: incomplete final line in: readLines(con, n, ok) > showConnections() class description mode text isopen can read can write 3 "tempfile"...

...> >> showConnections(all = TRUE) > > description > > 0 "stdin" > > 1 "stdout" > > 2 "stderr" > > 3 > "/var/folders/79/l_n_5qr152d2d9d9xs0591lh0000gn/T//RtmpZRcxmh/file128a13bffc77" > > class mode text isopen can read can write > > 0 "terminal" "r" "text" "opened" "yes" "no" > > 1 "terminal" "w" "text" "opened" "no" "yes" > > 2 "terminal" "w&...

...hen there's the PushBack members, to which the user would have full access. Looks like they're only used in text connections. Would these be better off placed in the private member structure? Also, the user has the capability to call close on the connection without updating the original isopen member. Here's a rather restrictive approach whereby the user must know the integer index of the connection. Each function is a wrapper around the related Rconnection member. int R_VfprintfConnection(int idx, const char *format, va_list ap){ Rconnection con = getConnection(idx);...

...Bengtsson/Wishlist-for-R/issues/81). BACKGROUND: In R, connections are indexed by their (zero-based) row indices in the table of available connections. For example, > fh <- file("a.txt", open = "w") > showConnections(all = TRUE) description class mode text isopen can read can write 0 "stdin" "terminal" "r" "text" "opened" "yes" "no" 1 "stdout" "terminal" "w" "text" "opened" "no" "yes" 2 "stderr&qu...

...f false only open user-created connections are included. but > # create a file > cat("TITLE extra line", "2 3 5 7", "", "11 13 17", file="ex.data", + sep="\n") > showConnections(all=TRUE) class description mode text isopen can read can write 0 "stdin" "terminal" "r" "text" "opened" "yes" "no" 1 "stdout" "terminal" "w" "text" "opened" "no" "yes" 2 "stde...

Cran task views seems to be a "once-per-session" process -- the first attempt to access views in a (RGui for Windows) session works, but subsequent attempts fail. There is a noticeably long pause before the failing call returns. Example session with two calls to "available.views" follows, but similar effects have been observed with two calls to "install.views" and

...f false only open user-created connections are included. but > # create a file > cat("TITLE extra line", "2 3 5 7", "", "11 13 17", file="ex.data", + sep="\n") > showConnections(all=TRUE) class description mode text isopen can read can write 0 "stdin" "terminal" "r" "text" "opened" "yes" "no" 1 "stdout" "terminal" "w" "text" "opened" "no" "yes" 2 "stde...

...connection you cannot close(), i.e. the last showConnections() call prints: ? showConnections(all = TRUE) description 0 "stdin" 1 "stdout" 2 "stderr" 3 "/var/folders/59/0gkmw1yj2w7bf2dfc3jznv5w0000gn/T//Rtmpc7JqVS/filecc2044b2ccec" class mode text isopen can read can write 0 "terminal" "r" "text" "opened" "yes" "no" 1 "terminal" "w" "text" "opened" "no" "yes" 2 "terminal" "w" "text" "...

...that can be parsed line by line (using readLines() or scan() to read). But open() cannot be directly applied to a file name. In fact, one only needs supply the 'open' argument in file() with something other than the empty string, ,---- | > con <- file ("S200.dat") | > isOpen (con) | [1] FALSE | > con <- file ("S200.dat", open = "r") | > isOpen (con) | [1] TRUE `---- It is not clear to me how 'open()' is supposed to be used. It took me a while to figure this out and I thought it might be worthwhile to add one sentence or two to mak...

...rn=FALSE), error=function(x) NA) [1] NA *Warning message:* *In file(con, "r") :* * cannot open file '/var/folders/79/l_n_5qr152d2d9d9xs0591lh0000gn/T//RtmpzIZ6Qh/file1ed2e57f2ea': No such file or directory* > showConnections(all=TRUE) description class mode text isopen can read can write 0 "stdin" "terminal" "r" "text" "opened" "yes" "no" 1 "stdout" "terminal" "w" "text" "opened" "no" "yes" 2 "stderr...

This may be more of an OS question ... I have this call r = get.hist.quote(symbol, start= format(start, "%Y-%m-%d"), end= format(end, "%Y-%m-%d")) which does a url request in a loop and my program runs out of file handlers after few hundred rotations. The error message is: 'Too many open files'. Other than increasing the file handlers assigned to my process, is there

...mode); + fp = fdopen(dup(0), con->mode); #else warning(_("cannot open file '%s': %s"), name, "fdopen is not supported on this platform"); @@ -633,8 +633,7 @@ static void file_close(Rconnection con) { Rfileconn this = con->private; - if(con->isopen && strcmp(con->description, "stdin")) - con->status = fclose(this->fp); + con->status = fclose(this->fp); con->isopen = FALSE; #ifdef Win32 if(this->anon_file) unlink(this->name); On Fri, Nov 11, 2016 at 1:12 PM, G?bor Cs?rdi <csardi.gabor...

....txt") # grab only *.txt files + fn2 <- gsub('.txt', "", fn) # removes the '.txt' from each string + for(i in 1:length(fn)) + assign((fn2[[i]]),file(fn[i], open="r")) + } > showConnections() #currently, no connections description class mode text isopen can read can write > inConnect() # run function > showConnections() #the connections are now there description class mode text isopen can read can write 3 "testx.txt" "file" "r" "text" "opened" "yes" "no"...

> # creating a file > cat("sddfasdf", file="tempfile") > showConnections() class description mode text isopen can read can write > con <- file("tempfile", "r") > readLines(con) [1] "sddfasdf" Warning message: incomplete final line in: readLines(con, n, ok) > showConnections() class description mode text isopen can read can write 3 "tempfile"...