Functions Returns Boolean in PowerShell

Question

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 ?

Answer 1

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;