On Error Resume Next Dim strComputer Dim objWMIService Dim colItems in .NET

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On Error Resume Next Dim strComputer Dim objWMIService Dim colItems
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strComputer = "" Set objWMIService = GetObject( _ "winmgmts:\\" & strComputer & "\root\cimv2") Set colItems = objWMIServiceExecQuery( _ "Select * from Win32_QuotaSetting",,48) For Each objItem in colItems WScriptEcho "Caption: " & objItemCaption WScriptEcho "DefaultLimit: " & objItemDefaultLimit WScriptEcho "DefaultWarningLimit: " & _ objItemDefaultWarningLimit WScriptEcho "Description: " & objItemDescription WScriptEcho "ExceededNotification: " & _ objItemExceededNotification WScriptEcho "SettingID: " & objItemSettingID WScriptEcho "State: " & objItemState WScriptEcho "VolumePath: " & objItemVolumePath WScriptEcho "WarningExceededNotification: " & objItemWarningExceededNotification
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Writing the Query in VBScript
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If you're like me, you like your final scripts to be clean, consistent, and easy to read Using the Wizard- or Scriptomatic-generated scripts isn't the best way to achieve consistency For example, the PrimalScript Wizard always includes the following code
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On Error Resume Next Dim strComputer Dim objWMIService Dim colItems
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strComputer = "" Set objWMIService = GetObject("winmgmts:\\" & strComputer & "\root\cimv2")
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First, you might not want error-checking turned off, which is what On Error Resume Next does You might use a different variable naming convention (I often do, mainly because I'm a bit too lazy to type str instead of just s for string variables and the like), or you might have already defined a variable name that the wizard is using Understand that you can always revise and modify the template scripts to fit better within your overall scripts Not only can you change them, you probably should change them Suppose you want to write a script that restarts a remote server You've done your browsing, and Win32_OperatingSystem has a method named Shutdown that looks like it'll do the trick Using Scriptomatic or the WMI Query Wizard, you generate code similar to the following
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On Error Resume Next Dim strComputer Dim objWMIService Dim colItems strComputer = "" Set objWMIService = GetObject("winmgmts:\\" & _ strComputer & "\root\cimv2") Set colItems = objWMIServiceExecQuery( _ "Select * from Win32_OperatingSystem",,48) For Each objItem in colItems WScriptEcho "BootDevice: " & objItemBootDevice WScriptEcho "BuildNumber: " & objItemBuildNumber WScriptEcho "BuildType: " & objItemBuildType WScriptEcho "Caption: " & objItemCaption WScriptEcho "CodeSet: " & objItemCodeSet
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Using the Query Results
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Let's look at a real-world use for WMI, and walk through the process of building the script Suppose you want to modify a remote computer's network configuration so that all network adapters have DHCP enabled Actually, you'll probably want to check multiple machines at once, so you'll need the script to read computer names from a text file that you'll create, using one computer name per line within the file If the script finds that DHCP is already enabled, you want it to tell you so NOTE A slightly more real-world task might be to modify the configuration only for a specific network adapter, like the one named Local Area Network, in each machine That requires working with WMI associator classes, which I'll cover in the next chapter
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The first part I like to handle is the WMI bit I've found the Win32_NetworkAdapterConfiguration class, which has an EnableDHCP method that should do the job I used the PrimalScript WMI Query Wizard to generate a template script for the class, and then trimmed it down to look like this
On Error Resume Next Dim strComputer Dim objWMIService Dim colItems
strComputer = "" Set objWMIService = GetObject("winmgmts:\\" & _ strComputer & "\root\cimv2") Set colItems = objWMIServiceExecQuery( _ "Select * from Win32_NetworkAdapterConfiguration",,48) For Each objItem in colItems WScriptEcho "DHCPEnabled: " & objItemDHCPEnabled WScriptEcho "Caption: " & objItemCaption Next
I need to have the script run through a text file, so I'll add the appropriate code I showed you how to work with files and folders in 12
Dim strComputer Dim objWMIService Dim colItems
Dim objFSO, objTS
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Alternative Methods
As I mentioned earlier in this chapter, you're likely to run across other ways of performing WMI queries For example, here's a short script that returns some information about a remote machine named Server1
Set System = GetObject("winmgmts:{impersonationLevel=" & _ "impersonate}!//server1/root/cimv2:" & _ "Win32_ComputerSystem=""SERVER1""")
WScriptEcho SystemCaption WScriptEcho SystemPrimaryOwnerName WScriptEcho SystemDomain WScriptEcho SystemSystemType
This doesn't follow the template-style query I've been using so far; in fact, it doesn't even use WQL However, this example is functionally the same as the following one