Is there a way for me to get Powershell input and output programatically while powershell is running?

Question

I have a scenario where I need to forward the command and output of a powershell command to another process for logging and processing.

I would like this console to be as close to powershell as possible, so simply hosting it in another console program is undesirable.

There's also start-transcript, but that seems to be buffered. I need to get the console output on a line-by-line basis.

If there's a way for me to set a delegate on the powershell host during WriteLine in the System.Management.Automation.Internal.Host.InternalHostUserInterface calls, that would be workable as well.

What's the best way to go about doing this?

Update (2012 May 29): I'm willing to go to absurd lengths to do this:

FieldInfo internaluiref = host.GetType().GetField("internalUIRef", BindingFlags.NonPublic | BindingFlags.Instance);
object valuecontainer = internaluiref.GetValue(host);
FieldInfo objectrefvalue = valuecontainer.GetType().GetField("_oldValue", BindingFlags.NonPublic | BindingFlags.Instance);
PSHostUserInterface internalHostUserInterface = (PSHostUserInterface)objectrefvalue.GetValue(valuecontainer);
FieldInfo externalUI = internalHostUserInterface.GetType().GetField("externalUI", BindingFlags.NonPublic | BindingFlags.Instance);
PSHostUserInterface externalHostUserInterface = (PSHostUserInterface)externalUI.GetValue(internalHostUserInterface);
HostUserInterfaceProxy indirector = new HostUserInterfaceProxy(externalHostUserInterface);
externalUI.SetValue(internalHostUserInterface, indirector);

This allows me to get categorized output stream information.

Any ideas how I can get the input?

Community · Accepted Answer · 2017-05-23 12:11:28Z

2

Don't confuse formatted output with raw output. Anything that reaches the host interface has been already been munged into a string. If you want the actual objects returned from a powershell script, take a look at my other answer here on how to stream output from a scriptblock executed in C#:

How to stream the output of a programmatically executed ScriptBlock?

edited May 23, 2017 at 12:11

CommunityBot

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answered May 24, 2012 at 18:49

x0n

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3 Comments

user1324792 Over a year ago

There are no scripts involved here. I just want the interactive user input/output.

x0n Over a year ago

Try looking at the placeholder function Out-Default. Run: out-default -? for more information.

user1324792 Over a year ago

out-default seems to work okay. How about the command itself?

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