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Powershell:  New-Object add-member for multiple attributes shows no value

Posted on 2011-02-23
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1,257 Views
Last Modified: 2012-06-27
Hello Experts,

I have the following Function in powershell to get complete disk information.


function get-diskinfo  {
param($servername)

if (($servername -eq "localhost") -or ($servername -eq $hostname)) {
    $ldiskobj = Get-WmiObject Win32_logicaldisk -computername $servername |
    Where-Object {$_.DriveType -eq "3"} | 
    Select-Object @{Name="ServerName";Expression={"{0:N1}" -f($_.__SERVER)}},
        @{Name="Drive";Expression={"{0:N1}" -f($_.DeviceID)}}, 
        @{Name="Size";Expression={"{0:N1}" -f($_.Size/1gb)}}, 
        @{Name="Freespace";Expression={"{0:N1}" -f($_.FreeSpace/1gb)}} 
    $phdskobj = Get-WmiObject Win32_DiskDrive -computername $servername |
    Select-Object Model,
    Bytespersector,
    InterfaceType,
    Manufacturer,
    Status,
    TotalHeads,
    TotalCylinders

}

else {
    $ldiskobj = Get-WmiObject Win32_logicaldisk -computername $servername -Credential $logincred |
    Where-Object {$_.DriveType -eq "3"} | 
    Select-Object @{Name="ServerName";Expression={"{0:N1}" -f($_.__SERVER)}},
    @{Name="Drive";Expression={"{0:N1}" -f($_.DeviceID)}}, 
    @{Name="Size";Expression={"{0:N1}" -f($_.Size/1gb)}}, 
    @{Name="Freespace";Expression={"{0:N1}" -f($_.FreeSpace/1gb)}}
    
    $phdskobj = Get-WmiObject Win32_DiskDrive -computername $servername -Credential $logincred |
    Select-Object Model,
    Bytespersector,
    InterfaceType,
    Manufacturer,
    Status,
    TotalHeads,
    TotalCylinders

}

$dskobj = New-Object psobject
$dskobj | Add-Member NoteProperty "Model" -Value $phdskobj.Model
$dskobj | Add-Member NoteProperty "Status" -Value $phdskobj.status
$dskobj | Add-Member NoteProperty "Drive" -Value $ldiskobj .Drive
$dskobj | Add-Member NoteProperty "Freespace" -Value $ldiskobj .Freespace
cls

$dskobj |fl

} 

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The Issue I am facing is when I have only one Hard drive and one partition , the script execute successfully with valid return.

However When a Server is having more than one physical disk or more than one partition it is returning no value for $dskobj properties. Well I understand why it is doing it , because it doesn't know how to present it. However I can't think of any way to present this data.

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Question by:comebui
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5 Comments
 
LVL 17

Accepted Solution

by:
Learnctx earned 500 total points
ID: 34966386
Because you're returning an array, you'll need to approach it a little bit differently. I haven't put the credential info back in, just adapt this to your needs and see if it works :)

Usage: Get-DiskInfo -target computername
Function Get-DiskInfo
{
    param([string]$target)
    if (!$target){$target = "."}
    $arrDiskInfo = @()
    GWMI -ComputerName $target Win32_DiskDrive | % {
        $objDiskInfo = New-Object PSObject
        $objDiskInfo | Add-Member -Type NoteProperty -Name "Model" -Value $_.Model
        $objDiskInfo | Add-Member -Type NoteProperty -Name "Status" -Value $_.Status
        GWMI -ComputerName $target -Query "ASSOCIATORS OF {Win32_DiskDrive.DeviceID='$($_.DeviceID)'} WHERE ResultClass=Win32_DiskPartition" | % {
            GWMI -ComputerName $target -Query "ASSOCIATORS OF {Win32_DiskPartition.DeviceID='$($_.DeviceID)'} WHERE ResultClass=Win32_LogicalDisk" | % {
                $objDiskInfo | Add-Member -Type NoteProperty -Name "Drive" -Value $_.DeviceID
                $objDiskInfo | Add-Member -Type NoteProperty -Name "Freespace" -Value $("{0:N1}" -f($_.Freespace/1GB))
            }
        }
        $arrDiskInfo += $objDiskInfo
    }
    $arrDiskInfo | FL *
}

Open in new window

0
 
LVL 1

Author Comment

by:comebui
ID: 34969178
I have added the credential part and it is working as I wanted. Thanks for your help!!
Now few silly questions to annoy you.
1. What is %{}  ?  - You piped output of win32_diskdrive into this container is it same as an array @()

Few operation inside the %{} is bit difficult for a newbie like me understand. I understand the Associators of query , however why aren't you doing the same operation for $_.Model  as you are doing for $_.deviceid..

Thing is I am writing more functions like this and I can only use wmi queries for data from the servers as none of they will have powershell. So it would be great to know how this is working so that I keep building my shared function scripts


0
 
LVL 17

Expert Comment

by:Learnctx
ID: 34976682
% is a bad habit :) I forgot to replace that with the actual cmdlet when copying it over.
It is a shortcut for the ForEach-Object cmdlet. For example, these will do the same thing.
Get-Process | Foreach-Object {Blah}
Get-Process | % {Blah}

Open in new window

? is a shortcut for Where-Object, so if you see people piping to ? that's what that is all about.

The reason you don't need to do this to find the model and deviceID, is that there is only 1 reference to each physical device so for each drive in the target host you can assume the model and status will be the same for each partition on that drive.
0
 
LVL 17

Expert Comment

by:Learnctx
ID: 34976688
Also for some more info on Associators and all that have a look here: http://www.codeproject.com/KB/system/WQLByExample.aspx
0
 
LVL 1

Author Comment

by:comebui
ID: 34977254
Brilliant answers all my Questions!!!!
One thing now I have to figure out , How to add a new property (like : win32_timezone.caption ) to the existing psobject ($objdiskinfo)
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