Run command line command passing STDIN

Question

This is not a duplicate, see bolded parts; please vote to re-open

I am attempting to execute an external application via C#.

I wish to pass stdin into the started application, and capture the result.

The equivalent bash command would be:

echo Typist 1 . 0 | figlet-2.2.5/figlet -f Slant

In C#, how can I run the above command and store its stdout into a variable?

I have tried using Process.Start("figlet-2.2.5/figlet", "-f Slant"), but this doesn't work because the application:

needs data via stdin
requires parameters to be supplied
and provides output via stdout

Why not use Process.Start to execute a batch script or PowerShell script? How do you plan to store the stdout? — EJoshuaS - Stand with Ukraine, Oct 03 '16 at 16:10
@EJoshuaS I don't know how to store the stdout. That is why I am asking this question. "store the STDOUT output of the above command into _**some variable.**_" — theonlygusti, Oct 03 '16 at 16:11
http://stackoverflow.com/questions/285760/how-to-spawn-a-process-and-capture-its-stdout-in-net — EJoshuaS - Stand with Ukraine, Oct 03 '16 at 16:11
@EJoshuaS I don't understand the top answer on that question. I am very new to C#. — theonlygusti, Oct 03 '16 at 16:12
@EJoshuaS `OutputDataReceived` is some kind of event listener? — theonlygusti, Oct 03 '16 at 16:13
To clarify my above question, what you mean by "store?" What do you intend to do with the stdout information once you have it (write to file, store to database, etc.)? — EJoshuaS - Stand with Ukraine, Oct 03 '16 at 16:14
@EJoshuaS once I have it, I'd eventually like to write it to stdout itself — theonlygusti, Oct 03 '16 at 16:17
I'm confused - if it was already written to stdout why would you write it there again? — EJoshuaS - Stand with Ukraine, Oct 03 '16 at 16:22
@EJoshuaS I want to take `echo Typist 1 . 0 | figlet-2.2.5/figlet -f Slant`'s stdout and store it in a string variable. — theonlygusti, Oct 03 '16 at 16:25
The code in the linked article should work for that purpose. — EJoshuaS - Stand with Ukraine, Oct 03 '16 at 16:30
@EJoshuaS but I am needing to pass some info on stdin as well as command-line flags. — theonlygusti, Oct 03 '16 at 16:31
Your question is very broad. Part of it (i.e. a part that by itself _might_ arguably not be too broad) is answered by the marked duplicate. Really though your first step is to read the documentation for the `Process` class. It discusses in detail how redirection of the standard I/O streams work. Note that you don't necessarily have to use the `...DataReceived` events; the `Out` and `Error` properties return `TextReader` objects which you can read asynchronously (e.g. `ReadLineAsync()`). — Peter Duniho, Oct 03 '16 at 16:42
Microsoft provides a code sample for writing to stdin here: https://msdn.microsoft.com/en-us/library/system.diagnostics.process.standardinput(v=vs.110).aspx — EJoshuaS - Stand with Ukraine, Oct 03 '16 at 16:43

Run command line command passing STDIN

This is not a duplicate, see bolded parts; please vote to re-open

0 Answers0