file.remove after display...

[George Kumar]

Forgive me if this has already been asked or I am making some silly
mistakes.

I was wondering what is wrong with this code.

....do some calculation ....
png(file=outputfile)
....call plot()...to produce a plot....
....
cat("<br>")
img(imgoutfile); <<<<<<this is just an R function that produces
html <img> tag...
cat("</BODY></HTML>\n")
file.remove(outputfile)- <<<<<< Putting this causes problem......
DONE

My goal was to remove the file on the server once it is displayed on
the browser...but as soon as I introduce file.remove() line....the
file is indeed deleted on the server..but the image is not displayed
at all..instead all I see is a broken sign...where an Image should
have been...

Is there anything wrong with this code sequence..?

Thanks all.
George

[Aleksandar Blagotić]

Use tempfile().

aL3xa

George

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[George Kumar]

tempfile() has the same issue. Notice that I am not using sendBin,
readbin combination that are given as examples in the file
rapache-1.1.9/test/sendBin.R. I am using my own function, the code for
which is shown below. Basically it just inserts a html href tag in the
file to display the image:

img <- function (src)
{
result <- src
result <- paste("<IMG SRC=\"", result,
"?nocache=", sample(9999, 1), "\"",
sep = "")
result <- paste(result, ">", sep = "")
cat(result)
invisible(result)
}

Thanks.
George

On Dec 17, 2:56 pm, Aleksandar Blagotić <aca.blago...@gmail.com>
wrote:

[Christian Parker]

I may be wrong but I believe that all of the R code is processed by
the server before the HTML code is passed along, which means your
image is deleted by the time the browser knows to look for it.