Unable to log Powershell output in the c# code.

[arvindathere]

Hi all,

Am using a powershell script to get the network configuration from the VMs.

Am logging this output in log file as well as connecting this to file stream (to be used/logged in the c# code).

C#code --> invoke cmds in powershell

Logs               Logs

(not seen)      (seen)

Now the output from the script is received and logging works fine in powershell code but not in the C# code.

Any clues ? Is there some formatting i need to watch out for ??

Regards,

Arvind S.

[LucD]

Powershell uses different 'streams' for different types of output.

Are you redirecting and capturing all the streams?

For more details on these streams and redirection have a look at About Redirection

[arvindathere]

Hi LucD​

Yes .All levels of log streams are redirected and mapped.

Regards,

Arvind S,

[arvindathere]

Let me dive deeper.

For instance

e.g . $ret = Invoke-VMScript <>

Using this $ret is ineffective in C# here . The output  of $ret when printed  has no use.

If I run the command though, the script output is seen without any issues.

However while using that script output of Invoke-VMScript command in variable and using it has no impact.

Here even the logging of the variable in C# code is ineffective (not logged)

Regards,

Arvind S.

[LucD]

Isn't that because the cmdlet is not actually producing output, but placing an object on the pipeline.

What happens when you 'pipe' that to an Out-String for example?

[arvindathere]

It is actually returning some value. The issue is intermittent.

We were able to redirect to a file form script but not able to return it to the caller of the script which is c# code.

We could see the output very well in the redirected file.

[LucD]

I'm not a regula c# user, but isn't capturing PowerShell output basically something like this?

PowerShell ps = PowerShell.Create().AddScript("c:\test.ps1", true);

ps.Runspace = remoteRunspace;

ICollection<PSObject> results = ps.Invoke();

using (StringWriter sw = new StringWriter())

{

  foreach (PSObject invoke in results)

   sw.WriteLine(invoke.ToString());

  outp = sw.ToString();

}

[arvindathere]

Thanks LucD.

We too are tried similar to what you had described above.

The output of the script being stored in a variable:

Example:

$output_str = invoke-vmscript <  ifconfig >

If we log the output_str or access for parsing, the script proceeds further.

However the stream which is being used by C# code is not getting anything from then on.

Only If we comment out the logging and parsing, the stream is properly going back to C# code.

Then, we modified the above line like:

$output = invoke-vmscript <  ifconfig >

$output_str = $output.ScriptOutput

$f1 =  parse ($output_str)

#Log $f1

Then, the parsing is working and c# is able to read the stream properly.

The problem is  if I uncomment the “Log $f1”, again we don’t see anything in the stream at C# end.

Not sure what is happening here.

Regards,

Arvind S

[LucD]

Like I said I'm not really that deep into c#.

This looks more like a PowerShell - c# subject, it shouldn't make a lot of difference when you run a PowerCLI cmdlet in the PowerShell session.
I assume you see the same issue when you run a PowerShell cmdlet this way?

On a side-note, is this helping?

c# - Get Powershell command's output when invoked through code - Stack Overflow

Otherwise, I think your question would get a better answer in a Developer forum.

Perhaps try raising your question in one of those.

[arvindathere]

Oh ok. The link may not help us much .. Anyways thank you.

[arvindathere]

I am bit uncertain which forum should I post. Do you have any suggestion on this? A reference to the forum would help me.

[LucD]

Looks like the VMware{code} forums merged with the VMTN forums.
This is the overview of the Developer related forums on VMTN: Forums - VMware {code}

Not sure which one on there would be the best fit for your question, perhaps vSphere Automation SDK for .Net Forum - VMware {code}