[R] Opening Another Application in R Then Hangs

[Jeff Newmiller]

If you open an app using the default settings for system2, R normally expects to let you know what the program's return value was, so if it was interactive you would need to terminate the program so there would be a result for system2 to return with. For what you actually appear to be doing you probably want to read ?system2.

On July 5, 2020 3:16:12 PM PDT, "Sparks, John" <jspark4 using uic.edu> wrote:
>Hi Jeff,
>
>Greatly appreciate your reply, but I don't quite understand it.
>
>Perhaps I should give a little more detail.
>
>For this example, I want to open notepad, then go to notepad and type
>something in.  So the program
>
>library(KeyboardSimulator)
>setwd("C:/Users/JSparks/AppData/Roaming/Microsoft/Windows/Start
>Menu/Programs/Accessories")
>system2("Notepad",invisible=FALSE)
>mouse.move(2423,236)
>mouse.click()
>keybd.type_string("Hello world!")
>
>would do this, but it does not advance passed the system2 command.
>
>Best wishes,
>--JJS
>
>________________________________
>From: Jeff Newmiller <jdnewmil using dcn.davis.ca.us>
>Sent: Sunday, July 5, 2020 5:08 PM
>To: r-help using r-project.org <r-help using r-project.org>; Sparks, John
><jspark4 using uic.edu>; R-help <r-help using r-project.org>
>Subject: Re: [R] Opening Another Application in R Then Hangs
>
>Exit the application you started?
>
>On July 5, 2020 3:06:52 PM PDT, "Sparks, John" <jspark4 using uic.edu> wrote:
>>Hi R Helpers,
>>
>>I am trying to open another application from within R and then work
>>with it.
>>
>>I can get the application to open, but R then hangs at that point
>>(spinning blue circle in the middle of the screen) and my subsequent
>>programming does not execute.
>>
>>Does anybody know how to get R to unlock?
>>
>>I am using Windows 10 and R4.0.
>>
>>The example below freezes R on my machine.
>>
>>Any guidance appreciated.  Thanks.
>>--John Sparks
>>
>>setwd("C:/Users/JSparks/AppData/Roaming/Microsoft/Windows/Start
>>Menu/Programs/Accessories")
>>system2("Notepad",invisible=FALSE)
>>
>>
>>
>>
>>
>>
>>       [[alternative HTML version deleted]]
>>
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>>PLEASE do read the posting guide
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>>and provide commented, minimal, self-contained, reproducible code.
>
>--
>Sent from my phone. Please excuse my brevity.

-- 
Sent from my phone. Please excuse my brevity.