Documentation page for the Change() method of Win32_Service in VB.NET

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Documentation page for the Change() method of Win32_Service
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The backup plan: enumerating objects
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documentation (which I found by searching for Win32_Service, and then clicking on the Change method). Reading this page, I discover that I don t have to specify every single parameter of the method. I can specify Null (which in PowerShell is in the special built-in $null variable) for any parameters that I want to omit. I want to change the service s startup password, which is the eighth parameter, so I ll need to specify $null for the first seven parameters. That means my method execution might look something like this:
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Change($null, $null, $null, $null, $null, $null, $null, "P@ssw0rd")
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By the way, the reason I m not using Get-Service and Set-Service is that those cmdlets are incapable of displaying or setting a service s logon password. WMI can do it, though, so I m using WMI. Because I can t use the Set-Service batch cmdlet, which would normally be my preferred approach, I ll try my second approach, which is to use Invoke-WmiMethod. The cmdlet has a parameter, -ArgumentList, where I can specify the arguments for the method. Here s what I try, along with the result I get:
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PS C:\> gwmi win32_service -filter "name = 'BITS'" | invoke-wmimethod -name change -arg $null,$null,$null,$null,$null,$null,$null,"P@ssw0rd" Invoke-WmiMethod : Input string was not in a correct format. At line:1 char:62 + gwmi win32_service -filter "name = 'BITS'" | invoke-wmimethod <<<< -nam e change -arg $null,$null,$null,$null,$null,$null,$null,"P@ssw0rd" + CategoryInfo : NotSpecified: (:) [Invoke-WmiMethod], Forma tException + FullyQualifiedErrorId : System.FormatException,Microsoft.PowerShell .Commands.InvokeWmiMethod
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At this point, I have to make a decision. It s possible that I m running the command incorrectly, so I have to decide if I want to spend a lot of time figuring it out. It s also possible that Invoke-WmiMethod just doesn t work with the Change() method very well, in which case I could be spending a lot of time trying to fix something that I have no control over. My choice in these situations is to try a different approach: I m going to ask the computer (well, the shell) to enumerate the service objects, one at a time, and execute the Change() method on each of them, one at a time. To do so, I ll use the ForEach-Object cmdlet:
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PS C:\> gwmi win32_service -filter "name = 'BITS'" | foreach-object {$_.cha nge($null,$null,$null,$null,$null,$null,$null,"P@ssw0rd") } __GENUS __CLASS __SUPERCLASS __DYNASTY __RELPATH __PROPERTY_COUNT __DERIVATION __SERVER __NAMESPACE : : : : : : : : : 2 __PARAMETERS __PARAMETERS 1 {}
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__PATH ReturnValue
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CHAPTER 13 : : 0
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Working with bunches of objects, one at a time
The documentation page says that a ReturnValue of 0 means success, so that means I achieve my task. But let s look at that command in more detail, with a bit nicer formatting:
Get-WmiObject Win32_Service -filter "name = 'BITS'" | ForEach-Object -process { $_.change($null,$null,$null,$null,$null,$null,$null,"P@ssw0rd") }
There s a lot going on there. The first line should make sense: I m using GetWmiObject to retrieve all instances of Win32_Service that match my filter criteria, which is looking for services that have the name BITS (as usual, I m picking on the BITS service because it s less essential than some others I could have picked, so breaking it won t crash my computer). I m piping those Win32_Service objects to the ForEach-Object cmdlet. Let s break that down into its component elements:
First, there s the cmdlet name: ForEach-Object. Next, I m using the -Process parameter to specify a script block. I didn t originally type the -Process parameter name, because it s a positional parameter. But that script block everything contained within the curly braces is the value for the -Process parameter. I went ahead and included the parameter name when I reformatted the command for easier reading. ForEach-Object will execute its script block once for each object that was piped into ForEach-Object. Each time the script block executes, the next piped-in object will be placed into the special $_ placeholder. By following $_ with a period, I m telling the shell that I want to access a property or method of the current object. In this example, I m accessing the Change() method. Note that the method s parameters are passed as a comma-separated list, contained within parentheses. I ve used $null for the parameters I don t want to change and provided my new password as the eighth parameter. The method accepts more parameters, but because I don t want to change the ninth, tenth, or eleventh ones, I can omit them entirely (I could also have specified $null for the last three parameters).
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