Functions Returns Boolean in PowerShell

function powershell boolean return-value

30,129

Functions return whatever each command spits out to the output stream. Try eliminating that output like so:

    [void]WriteTrace "[TryDisableClientForCredSSP]. Disable-WSManCredSSP -Role Client "
    $script=Convert-StringToScriptBlock("Disable-WSManCredSSP -Role Client ")
    [void]Caller($script)

    [void]WriteTrace "[TryDisableClientForCredSSP]. winrm get winrm/config/client/auth [($env:COMPUTERNAME)]"
    $script=Convert-StringToScriptBlock("winrm get winrm/config/client/auth")
    [void]Caller($script);

    return $true;

30,129

Author by

Kiquenet

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Updated on September 14, 2020

Comments

Kiquenet over 3 years

I use PS Remoting , Powershell 2.0.

I need call to Functions that returns boolean value ($true or $false).

My function:

Function TryDisableClientForCredSSP()
{
    try 
    {
        WriteTrace "[TryDisableClientForCredSSP]. Disable-WSManCredSSP -Role Client "
        $script=Convert-StringToScriptBlock("Disable-WSManCredSSP -Role Client ")
        Caller($script)

        WriteTrace "[TryDisableClientForCredSSP]. winrm get winrm/config/client/auth [($env:COMPUTERNAME)]"
        $script=Convert-StringToScriptBlock("winrm get winrm/config/client/auth")
        Caller($script);

        return $true;
    }
    catch 
    {
        Write-Verbose "[TryDisableClientForCredSSP] Error "
        Write-Verbose $_
        Write-Host $_.Exception.Message`r`n
        return $false;
    }   
}

note: WriteTrace function just only do Write-Host.

I use it:

    $ok = TryDisableClientForCredSSP;
    WriteTrace   "[TryDisableClientForCredSSP]. $ok"
    if ($ok -eq $true)
    {
        WriteTrace "[TryDisableClientForCredSSP]. OK true"
    }
    else
    {
        WriteTrace "[TryDisableClientForCredSSP]. KO false"
    }

I get this output:

[TryDisableClientForCredSSP]. Auth     Basic = true     Digest = true     Kerberos = true     Negotiate = true     Certificate = true     CredSSP = false  True
[TryDisableClientForCredSSP]. OK true

I want that this line outputs "[TryDisableClientForCredSSP]. True"

 WriteTrace   "[TryDisableClientForCredSSP]. $ok"

Any suggestions ?

Mike Shepard over 11 years

And if you don't like using [void], you can add | out-null to those lines instead.
Victor Zakharov over 11 years

Isn't there a more simple way to stop output, such as using a semicolon after a command?
Keith Hill over 11 years

There are three ways: [void]..., ... | Out-Null and ... > $null. That's it.
Kiquenet over 10 years

Any sample for three ways in your answer it would be great, I think.