Running OS commands

[Louis LaBrunda]

Hi All,

I would like to add the ability to run OS commands to two of my programs that run on a Raspberry Pi.  This would be from one of the web browser pages I use to change settings.  I have used OsProcessStarter.  I would like to use it and capture the output of the executed command and display it.  There are options for sending the output to a file or pipe.  Can I capture the output in an object with a pipe or is that just for sending it to another program?  Can the output be piped back into my Smalltalk program?.  Or do I need to send the output to a file and read the file?

Lou

[Mariano Martinez Peck]

Hi Louis, 

Not sure if I fully understood your question but can't you simply do something like this (notice the last line):

processStarter := OsProcessStarter command: ....

process := processStarter start.

process waitForCompletion.

process outputStream upToEnd inspect 

Regards,

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Mariano Martinez Peck VAST Team Lead Senior Software Engineer  mp...@instantiations.com  @MartinezPeck  /mariano-martinez-peck  instantiations.com

[Louis LaBrunda]

Hi Mariano,

Thanks for the reply.  Basically, I want to make an area of a web page look like a window like cmd.exe would give you.  This is sort of like VNC but just Windows or Linux commands.

When I use "process waitForCompletion.", the process never ends and I have to break into it.

When I try this:

| com process |
com := OsProcessStarter command: #('c:\Windows\System32\cmd.exe' 'dir').
process := com start.
(Delay forSeconds: 2) wait.
process outputStream upToEnd inspect.

I always get the same thing:

'Microsoft Windows [Version 10.0.19045.4355]
(c) Microsoft Corporation. All rights reserved.

C:\VASTPlatform V13.0.0\images64\WiFiClock>'

Lou

[Seth Berman]

Greetings Lou,

Invoking cmd.exe the way you are doing it starts and interactive session which is not going to terminate.
Hint: Use the /C argument (Carries out the command specified by string and then terminates)

| process |

process := OsProcessStarter start: #('c:\Windows\System32\cmd.exe' '/c' 'dir').

process waitForCompletion.
process outputStream upToEnd inspect

- Seth

[Louis LaBrunda]

Hey Seth,

Thanks for the reply.  That solves the problem of the wait not ending and it captures the output.

I don't think I can reproduce the Windows/Linux command terminal but I don't think I need to.  My cousin has a copy of the clock program and for a while there was some question as to if she could use VNC, so I was looking for a way around it.  I now think that she can use the free RealVNC viewer.  I think I will still implement the ability to execute a single command and get the results.

I will keep the group informed.

Lou