I do most of my scripting in VBScript and I often use WMI queries to get information from the system. The WMI ExecQuery method always returns a WMI collection object that I have to access from a For loop -- even in cases where you could only ever possibly return one item. Here is an example:
Set objWMI = GetObject("winmgmts:\\.\root\cimv2")
Set objColItems = objWMI.ExecQuery("SELECT * FROM Win32_BIOS",,48)
For Each objItem In objColItems
strManufacturer = objItem.Manufacturer
Next
...
In this example, all I need is the brand of computer (i.e. Dell, HP, etc.). There should only ever be one instance of the Win32_BIOS class.
What's even more annoying, though, is when the class has multiple instances (say, Win32_Printers for example), and I know exactly which one I am looking for. Then I have to insert an If to check the name. It's an annoying amount of code when you're just looking for one piece of information from several classes.
I thought I saw a code sample once upon a time where someone accessed a property directly from an instance of a WMI class with a single line of code, but of course I didn't write it down.
So is there a way to do that without having to query for it and run it through a loop?
Update:
OK, I guess I just didn't Google hard enough, but I found out that what I am looking for is the SWbemServices.Get method. This allows you to get properties of a specific instance of a class without querying for it.
In the example they provide on that page, I can get the status of a service with just two lines of code:
Set objWMI = GetObject("winmgmts:\\.\root\cimv2").Get("Win32_Service.Name='Spooler'")
WScript.Echo objWMI.State
Neat. Except it only works in cases where there are multiple instances of the class and you know which one you're after. A good find, but how do I use it in the example I gave above, where there is only one instance?
Set objWMI = GetObject("winmgmts:\\.root\cimv2").Get("Win32_BIOS.Manufacturer")
Gives me an error: Invalid object path.
Set objWMI = GetObject("winmgmts:\\.root\cimv2").Get("Win32_BIOS")
That line works, but it's not bound to an instance so all I get are nulls.
How do I use this technique for single-instance classes? Like is there a way to specify the "default" instance?
