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PS (8) > $procs.count 1 PS (9) > $procs[0].name calc.exe
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And, now that we have the necessary object, we can finally call the WMI method to shut down the calculator process.
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PS (10) > $procs[0].terminate(0) __GENUS __CLASS __SUPERCLASS __DYNASTY __RELPATH __PROPERTY_COUNT __DERIVATION __SERVER __NAMESPACE __PATH ReturnValue : : : : : : : : : : : 2 __PARAMETERS __PARAMETERS 1 {}
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The calculator window should have vanished from the desktop at this point. We ll use Get-Process one more time to verify that the process is indeed gone.
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PS (12) > get-process calc Get-Process : Cannot find a process with the name 'calc'. V erify the process name and call the cmdlet again. At line:1 char:12 + get-process <<<< calc PS (13) >
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This example illustrates that methods on WMI objects work pretty much as expected. The WMI adapter takes care of the details. 12.2.7 Working with WMI events The last element of WMI we re going to talk about is the WMI event. Unfortunately this doesn t quite work the way we would like it to. One would expect that one could just attach a scriptblock to an event like we did with WinForms in chapter 11. This worked for WinForms because the form does a synchronous callback on the original thread. In WMI (and other event sources in Windows), these events are generated asynchronously, which requires that they run on a new thread. The first release of PowerShell doesn t allow this. What you d have to do is write a cmdlet that listens to
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the events and then forwards them to PowerShell by writing them into the pipeline. You can, however, handle them synchronously. Let s look at how to do this. We ll look at detecting when a user plugs in a USB device. We start by creating an instance of Management.EventQuery. This query describes the events we re interested in being notified about.
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PS PS >> >> >> >> (1) > $query = new-object Management.EventQuery (2) > $query.QueryString = "SELECT * FROM __InstanceCreationEvent WITHIN 10 WHERE Targetinstance ISA 'Win32_PNPEntity' and TargetInstance.DeviceId like '%USBStor%'"
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Next we create a ManagementEventWatcher object from this query object.
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PS (3) > $watcher = new-object Management.ManagementEventWatcher ` >>> $query
And we wait to be notified that an instance of this event has occurred. This will block the script until the event happens.
PS (4) > $result = $watcher.WaitForNextEvent()
As soon was we plug in (or turn on) a USB device, the event occurs and unblocks the script. The event details are placed into the $result variable. Let s take a look and the name and device ID for what was plugged in.
PS (5) > $result.TargetInstance | fl name, DeviceId name : HP Photosmart 2575 USB Device DeviceId : USBSTOR\DISK&VEN_HP&PROD_PHOTOSMART_2575&REV_1.0 0\7&31BC8B2D&0&MY586121MF04B8&0
The object in $result tells us that the device that was plugged in was an HP Photosmart printer. 12.2.8 Putting modified WMI objects back There s one last, very important topic we need to cover about using WMI in PowerShell. So far we ve looked at getting data and we ve looked at calling methods. Now we need to look at putting data back. In other words, how do we go about saving changes we ve made to a WMI object back to the repository Why is this even a topic, you ask After all, we don t have to do this with any of the other object types, right The reason is that the underlying store for a WMI object may be on a remote computer, and incrementally flushing a set of changes over a remote connection is simply too inefficient to use on a large scale.
AUTHOR S NOTE
It would have been great if incremental updates had worked, since it would make the user experience much simpler. Unfortunately, when we tried it, while it was OK for small demos, it just didn t work in real applications. As Einstein observed, things should be as simple as possible but no simpler.
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