R Under development (unstable) (2025-12-16 r89184 ucrt) -- "Unsuffered Consequences"
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> message("*** devList() ...")
*** devList() ...
> 
> library("R.devices")
R.devices v2.17.3 successfully loaded. See ?R.devices for help.
> 
> res <- devList()
> print(res)
named integer(0)
> stopifnot(is.integer(res))
> stopifnot(is.character(names(res)))
> 
> res <- devList(dropNull=FALSE)
> print(res)
Device 1 
       1 
> stopifnot(is.integer(res))
> stopifnot(is.character(names(res)))
> 
> res <- devList(interactiveOnly=TRUE)
> print(res)
named integer(0)
> stopifnot(is.integer(res))
> stopifnot(is.character(names(res)))
> 
> # - - - - - - - - - - - - - - - - - - - - - - - - -
> # Labels
> # - - - - - - - - - - - - - - - - - - - - - - - - -
> devSetLabel(which=1L, label="foo")
> label <- devGetLabel(1L)
> print(label)
[1] "foo"
> stopifnot(label == "foo")
> label <- devGetLabel("foo")
> print(label)
[1] "foo"
> stopifnot(label == "foo")
> 
> devSetLabel(which=1L, label="bar")
> label <- devGetLabel(1L)
> print(label)
[1] "bar"
> stopifnot(label == "bar")
> label <- devGetLabel("bar")
> print(label)
[1] "bar"
> stopifnot(label == "bar")
> 
> devSetLabel(which="bar", label="foo")
> label <- devGetLabel(1L)
> print(label)
[1] "foo"
> stopifnot(label == "foo")
> label <- devGetLabel("foo")
> print(label)
[1] "foo"
> stopifnot(label == "foo")
> 
> 
> res <- try(devGetLabel(which=10L))
Error in devGetLabel(which = 10L) : 
  Cannot get device label. No such device: '10' (known devices: 'foo')
> stopifnot(inherits(res, "try-error"))
> 
> message("*** devList() ... DONE")
*** devList() ... DONE
> 
> 
> proc.time()
   user  system elapsed 
   0.48    0.07    0.48