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The term codec stands for, variously, coder-decoder, compressor/decompressor, or compression/decompression algorithm. A codec is a piece of software that allows you to encode or decode a data stream. The most common use these days is for media formats such as WMA, MP3, and so on. By checking the list of codecs, you can tell whether the system will be able to decode and play a particular file.
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The VBScript code to do this is shown in listing 12.11. (This has been simplified somewhat from the original example.)
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Listing 12.11 VBScript to list codecs
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strComputer = "." Set objWMIService = GetObject("winmgmts:" _ & "{impersonationLevel=impersonate}!\\" & strComputer _ & "\root\cimv2") Set colItems = objWMIService.ExecQuery( "Select * from Win32_CodecFile") #1
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WMI preamble
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data For Each objItem in colItems Wscript.Echo "Manufacturer: " & objItem.Manufacturer Wscript.Echo "Name: " & objItem.Name Wscript.Echo "Path: " & objItem.Path Wscript.Echo "Version: " & objItem.Version Wscript.Echo "Caption: " & objItem.Caption Wscript.Echo "Drive: " & objItem.Drive Wscript.Echo "Extension: " & objItem.Extension Wscript.Echo "File Type: " & objItem.FileType Wscript.Echo "Group: " & objItem.Group strCreationDate = WMIDateStringToDate(objItem.CreationDate) Wscript.Echo "Creation Date: " & strCreationdate strInstallDate = WMIDateStringToDate(objItem.InstallDate) Wscript.Echo "Install Accessed: " & strInstallDate strLastModified = WMIDateStringToDate(objItem.LastModified) Wscript.Echo "Last Modified: " & strLastModified Wscript.Echo "" Next function Function WMIDateStringToDate(dtmDate) WMIDateStringToDate = CDate(Mid(dtmDate, 5, 2) & "/" & _ Mid(dtmDate, 7, 2) & "/" & Left(dtmDate, 4) _ & " " & Mid (dtmDate, 9, 2) & ":" & _ Mid(dtmDate, 11, 2) & ":" & Mid(dtmDate, _ 13, 2)) End Function
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Date helper
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This script begins with the standard preamble B that you see in most VBScripts that use WMI. It sets up a query against the local WMI provider for this machine. Next we display the set of fields C we re interested in. This is straightforward but tedious. The code formats and prints each field. One thing to note is how the date fields are handled. WMI uses a string encoding of a date object. To convert this into a date object, we need to use a function. This function D takes the string apart and puts it into a format that the system can convert into a date object. Now let s look at the PowerShell version.
WINDOWS OBJECTS: COM AND WMI
The PowerShell version We ll do this in two steps. You may have noticed that the VBScript function to parse the date was a bit complex. Rather than converting it into PowerShell, we ll just reuse it for now through the ScriptControl object we saw earlier. The first version, which is still using the VBScript date converter function, is shown in listing 12.12 (there are much easier ways of doing this, as we ll see later).
Listing 12.12 PowerShell script to list codecs
$code = @' Function WMIDateStringToDate(dtmDate) WMIDateStringToDate = CDate(Mid(dtmDate, 5, 2) & "/" & _ Mid(dtmDate, 7, 2) & "/" & Left(dtmDate, 4) _ & " " & Mid (dtmDate, 9, 2) & ":" & _ Mid(dtmDate, 11, 2) & ":" & Mid(dtmDate, _ 13, 2)) End Function '@ $vbs = new-object -com ScriptControl $vbs.language = 'vbscript' $vbs.AllowUI = $false Compile $vbs.addcode($code) VBScript code $vco = $vbs.CodeObject
VBScript code
get-wmiobject Win32_CodecFile | %{ $_ | format-list Manufacturer, Name, Path, Version, Caption, Drive, Extension, FileType, Group, @{l="Creation Date" e={$vco.WMIDateStringToDate($_.CreationDate)}}, @{l="Install Date" e={$vco.WMIDateStringToDate($_.InstallDate)}}, @{l="Last Modified Date" e={$vco.WMIDateStringToDate($_.LastModified)}} }
Process data
We ll use a here-string to hold the VBScript code B for the date converter function. Now use the ScriptControl object to compile it into a CodeObject C. We ll use $vco to hold the CodeObject just to make things a bit more convenient. This lets us invoke the method by doing $vco.WMIDateStringToDate(). Next is the PowerShell code to retrieve and print out the data D. As you might expect, it s rather shorter than the VBScript code. We use Get-WmiObject to directly get the data and Format-List to format the output. We have to specify the set of fields to display; otherwise we ll just get everything (in fact this shows PowerShell not at its best, since you have to work harder to do less). Also of note is how the date fields are specified. In chapter 8, we showed an example of using this construction with Select-Object. Its use was a bit different there we were selecting properties so we
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