[R-pkg-devel] Closing a display window from a program

[Serguei Sokol]

Le 19/11/2024 à 14:41, J C Nash a écrit :
> In answer to my own posting about this, I found the following partially
> answers what I need.
> 
> The task is to display a file (in my case a pdf, for which 'xdisp' contains
> the string for the command to do this. See below for the reason this is a
> variable. The displayed file has information I will need to possibly enter
> into other program structures and which may be in the form of pixels rather
> than text or numbers. Later, I wish to close the display when the need 
> is past.
> Clearly, that step could be left to the user, but I believe in decluttering
> the screen as much as I can.
> 
> 
>    cmd<-cmd <- paste0(xdisp," ",xdocfn," &") # add & to keep running and 
> return??
>    system(cmd)
>    pidcmd<-paste0("pgrep -f '",cmd,"'")
>    spid<-system(pidcmd, intern=TRUE) # gets spid, but stays running
>    # For some reason increased by 1
>    spid<-as.integer(spid)-1
> 
> Later on I can close the display with
> 
> # Kill the display of the statement now.
>    tmp<-readline("Kill the bill display process now")
>    kcmd<-paste0("kill -9 ",spid)
> 
> Clearly I'm on a Linux system (Mint 22 Wilma) I've not considered how 
> I'd do this
> in Windows, but would welcome suggestions as I believe cross-platform 
> solutions
> widen the utility of any software. I also looked at the CRAN package ps, 
> and found
> there are ways to use some of its tools. They may, in fact, be more 
> system-neutral,
> so are still on my radar for consideration.
> 
> My posting asked also if the display could be controlled as to position 
> and size.
> I have not yet found how to do that, but have found choice of the pdf 
> display
> program a partial help. I am currently setting xdisp to xpdf in an "ini" 
> file,
> for which the CRAN package ini is most helpful.
> 
> For information, I put below a solution to an Rstudio matter that arose.
> 
> Comments and discussion welcome.
> 
> Best,
> 
> John Nash
> 
> PS. In building this code in Rstudio and using browseURL(file) to open 
> the display,
> I got a warning error about "signal 10". This can be overcome by using
> browseURL(file, browser="xdg-open"). However, "file" must be either a 
> simple
> filename of a file in the current directory, or a fully qualified path. Use
> of the shortcut "~/" for the home directory fails.
may be path.exapnd()?
 > path.expand("~/tmp/my.pdf")
[1] "/home/sokol/tmp/my.pdf"


> This issue does not 
> arise
> for R in a terminal.
> 
> ______________________________________________
> R-package-devel using r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-package-devel