How to dump plots as bas64 strings?
Patrick Meyer wrote:
Here's the solution I'm using now, but it is not very "clean":
png("out.png")
plot(c(1,2,3))
dev.off()
system("base64 -w0 out.png > out.base64")
b64txt <- readLines(file("out.base64","rt"))
It would be nice to have an internal solution, even if this exactly does
what I want.
I'm not certain which bit of this you are referring to when you say "internal". It would be covenient to have graphics devices be able to write to a buffer as well a file and it wouldn't be terribly difficult to do, but hasn't been a big enough problem so far. As far calling the executable base64, why not use the function in either the caTools or RCurl packages. D.
Patrick Gabor Grothendieck wrote:
On Wed, Mar 4, 2009 at 9:17 AM, Patrick Meyer <paterijk at gmail.com> wrote:
Hello
My question might sound awkward, but I am looking for a way to somehow
convert a plot in R into a base64 string.
Here's an idea, but it is not at all satisfying.
1. write the plot to the harddisk:
---------------------------
png("toto.png")
plot(c(1,2,3))
dev.off()
---------------------------
2. somehow reload that file from the disk and transform it into a base64
string:
---------------------------
bin<-readBin(file("toto.png","rb"), raw(), n=1000,endian = "little")
This isn't much of an improvement and does not even address the main
concern but as no one has answered note that we can pass the filename
as a character string and it will get "rb" automatically and we can
just use "raw" if we like. Also n can be any size larger than the file
size (see ?readBin) so if the file size is 10000 or less:
readBin("toto.png", "raw", n = 10000, endian = "little")
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