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Visual Basic
WMI System Services Win32_CodecFile: WMI Installed Codec File Info |
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Posted: | Wednesday October 30, 2002 |
Updated: | Monday November 28, 2011 |
Applies to: | VB5, VB6 |
Developed with: | VB6, Windows XP |
OS restrictions: | Windows NT, 2000, XP. See Prerequisites below. |
Author: | VBnet - Randy Birch |
Related: |
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Prerequisites | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Windows Script Host is built into Microsoft Windows 98, 2000, ME and XP.
If you are running Windows 95 or NT4, you can download Windows Script
Host from the Microsoft Windows Script Technologies Web site at
http://msdn.microsoft.com/scripting/.
Some information is not returned on non-NT-based systems. A reference set in Projects / References to the Microsoft WMI Scripting Library. |
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Win32_CodecFile represents the audio or video codec installed on the computer system. Codecs convert one media format type to another, typically a compressed format to an uncompressed format. The name codec is derived from a combination of compress and decompress. For example, a codec can convert a compressed format such as MS-ADPCM to an uncompressed format such as PCM, which most audio hardware can play directly. This demo and illustration shows only some of the available information from the class. For a complete listing see the Comments section below. Note that some systems may not return information in all class properties. |
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To a form add a command button (Command1) and a listbox (List1). Set a reference in Projects / References to the Microsoft WMI Scripting Library, and add the following to the form: | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Option Explicit '''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''' ' Copyright ©1996-2011 VBnet/Randy Birch, All Rights Reserved. ' Some pages may also contain other copyrights by the author. '''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''' ' Distribution: You can freely use this code in your own ' applications, but you may not reproduce ' or publish this code on any web site, ' online service, or distribute as source ' on any media without express permission. '''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''' Private Sub Command1_Click() Call wmiWin32CodecFile End Sub Private Sub Form_Load() Command1.Caption = "Win32_CodecFile" End Sub Private Sub wmiWin32CodecFile() Dim objset As SWbemObjectSet Dim obj As SWbemObject Set objset = GetObject("winmgmts:{impersonationLevel=impersonate}"). _ InstancesOf("Win32_CodecFile") On Local Error Resume Next For Each obj In objset With List1 .AddItem "FileName: " & obj.FileName .AddItem "Version: " & obj.Version .AddItem "Manufacturer: " & obj.Manufacturer .AddItem "Name: " & obj.Name .AddItem "Description: " & obj.Description .AddItem "Caption: " & obj.Caption .AddItem "EightDotThreeFileName: " & obj.EightDotThreeFileName .AddItem "AccessMask: " & obj.AccessMask .AddItem "InstallDate: " & ConvertDate(obj.InstallDate) .AddItem "LastAccessed: " & ConvertDate(obj.LastAccessed) .AddItem "LastModified: " & ConvertDate(obj.LastModified) .AddItem "" End With Next End Sub Private Function ConvertDate(dtb) As String Dim d As String Dim t As String Dim bias As Long If Not IsNull(dtb) Then bias = SplitDateTimeBias(CStr(dtb), d, t) ConvertDate = Format$(d, "dddd mmm d, yyyy") & " at " & _ Format$(t, "hh:mm:ss") Else ConvertDate = "(date returned null)" End If End Function Private Function SplitDateTimeBias(leasedate As String, _ leasedatepart As String, _ leasetimepart As String) As Long 'takes a datetime returned 'and splits out the date and time 'components, returns them in the 'leasedatepart and leasetimepart 'passed variables, and returns the 'bias to be applied to the resultant date. Dim pos As Long Dim bias As Long pos = InStr(leasedate, ".") If pos > 0 Then bias = StripTimeZoneBias(leasedate) leasedatepart = Left$(leasedate, 8) leasetimepart = Mid$(leasedate, 9, pos - Len(leasedatepart) - 1) leasedatepart = InsertInString(leasedatepart, "-", 5, "") leasedatepart = InsertInString(leasedatepart, "-", 8, "") leasetimepart = InsertInString(leasetimepart, ":", 3, "") leasetimepart = InsertInString(leasetimepart, ":", 6, "") SplitDateTimeBias = bias Else End If End Function Private Function StripTimeZoneBias(leasedate As String) As Long Dim pos As Long Dim tmp As String pos = InStr(leasedate, "-") If pos = 0 Then pos = InStr(leasedate, "+") If pos = 0 Then StripTimeZoneBias = 0 Else End If Else tmp = Mid$(leasedate, pos, Len(leasedate)) leasedate = Mid$(leasedate, 1, pos - 1) StripTimeZoneBias = CLng(tmp) End If End Function Private Function InsertInString(ByVal sOriginal As String, _ sReplace As String, _ nField As Long, _ sDelimeter As String) As String 'c 1998 Mario Lavignasse 'Abbott Scientific 'Replaces or inserts a string into a (any char) delimeted string ' 'Syntax: 'sOriginal: string of interest, returned unchanged 'sReplace: replacement or insert chr(s) 'nField: 1-based position for the insert/replace to begin 'sDelimeter: string to insert/replace. If empty, sReplace is ' inserted, if present sDelimeter is replaced by sReplace. ' 'Examples: 'Inserting: ' x = InsertInString("Hello World", "Hello ", 7, "") ' (x="Hello Hello World") ' 'Replacing: ' x = InsertInString("Hello World", "Hello ", 7, "World") ' (x="Hello Hello") Dim lnCount As Long Dim lnStart As Long Dim lnLast As Long Do While InStr(lnStart + 1, sOriginal, sDelimeter) > 0 lnStart = InStr(lnStart + 1, sOriginal, sDelimeter) lnCount = lnCount + 1 If lnCount >= nField Then Exit Do End If lnLast = lnStart Loop Select Case lnCount Case 1 InsertInString = sReplace & Mid$(sOriginal, lnStart) Case Is >= nField InsertInString = Mid$(sOriginal, 1, lnLast) & _ sReplace & Mid$(sOriginal, lnStart) Case Else InsertInString = sOriginal & _ String$((nField - 1) - lnCount, sDelimeter) & _ sReplace End Select End Function |
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All information returned in the Win32_CodecFile class (note that
some systems may not return information in all class properties):
AccessMask is a Read-only bitmap list of
access rights to the given file or directory held by the user or group on
whose behalf the instance is returned. This property is only supported
under Windows NT and Windows 2000. On Windows 98 and on
Windows NT/Windows 2000 FAT volumes, the FULL_ACCESS value is returned
instead, indicating no security has been set on the object.
The Win32_CodecFile class defines the following methods.
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Copyright ©1996-2011 VBnet and Randy Birch. All Rights Reserved. |