EwfVolume Class (Standard 7 SP1)

[アーティクル]
07/09/2014

7/8/2014

The EwfVolume class is used to change the configuration of an Enhanced Write Filter volume.

The following syntax is simplified from Managed Object Format (MOF) code and includes all of the inherited properties.

Syntax

class EwfVolume
{
  string DriveLetter;
  string Name;
};

Members

The EwfVolume class defines the following types of members:

Methods
Properties

Methods

The EwfVolume class defines the following methods.

Methods	Description
Checkpoint Method	Adds an overlay level for the specified protected volume.
ClearCommand Method	Clears any pending commands that would have occurred on the next restart.
Commit Method	Commits all current level data in the overlay to the protected volume.
CommitAndDisableLive Method	Commits all current data in the overlay to the protected volume and then disables Enhanced Write Filter. For EWF RAM and RAM Reg overlays only.
CommitFile Method	Commits a single file to the protected volume. The size of the file or its location must not have changed before the file is committed.
Disable Method	Disables a currently enabled overlay for the specified protected volume.
Enable Method	Enables a currently disabled overlay for the specified protected volume.
Restore Method	Restores one overlay level for the specified protected volume, discarding all changes in the current level.
SetLevel Method	Sets the overlay level on a protected volume.

Properties

The EwfVolume class defines the following properties.

DriveLetter
- Data type: string
  
  Access type: Read-only
  
  Returns the drive letter of the volume.

Name
- Data type: string
  
  Access type: Read-only
  
  Qualifiers: Key
  
  Returns the name of the volume.

Example

This example can be used to list all the methods for EwfVolume.

Windows PowerShell

$ComputerName = "localhost"   # or "remote-machine-name"
$Namespace = "root\Microsoft\WriteFilters"
$Class = "EwfVolume"

Write-Host "Retrieving EWF volume methods..."

Get-WmiObject `
   -ComputerName $ComputerName `
   -Namespace $Namespace `
   -Class $Class `
| Get-Member * | Format-List Name, Definition

VBScript

strComputer = "localhost"   ' or "remote-machine-name"
strNamespace = "\root\Microsoft\WriteFilters"
strClass = "EwfVolume"

WScript.Echo "Retrieving EWF volume methods..."

On Error Resume Next

Set EwfVolume = GetObject("WINMGMTS:\\" & strComputer & strNamespace & ":" & strClass)

If Err.number <> 0 Then
   WScript.Echo "Method exited with error code: 0x" & Hex(Err.number)
   WScript.Echo Err.source & " - " & Err.Description
   WScript.Quit(1) 
End If

For Each M In EwfVolume.Methods_
   WScript.Echo "Method: ", M.Name
   WScript.Echo "Description: ", M.Qualifiers_("Description")
   If (M.InParameters Is Nothing) Then
      WScript.Echo "No input parameters"
   Else
      For Each Param In M.InParameters.Properties_
         WScript.Echo "Parameter Name: ", Param.Name
         WScript.Echo "Parameter Type: ", TypeName(Param.CIMType)
      Next
   End If
Next

Function GetTypeName(typeNumber)   
   Select Case typeNumber
      Case 2 GetTypeName = "16 bit Integer"
      Case 3 GetTypeName = "32 bit Integer"
      Case 4 GetTypeName = "32 bit Real Number"
      Case 5 GetTypeName = "64 bit Real Number"
      Case 8 GetTypeName = "String"
      Case 11 GetTypeName = "Boolean"
      Case 13 GetTypeName = "CIM Object"
      Case 16 GetTypeName = "signed 8 bit Integer"
      Case 17 GetTypeName = "unsigned 8 bit Integer"
      Case 18 GetTypeName = "unsigned 16 bit Integer"
      Case 19 GetTypeName = "unsigned 32 bit Integer"
      Case 20 GetTypeName = "signed 64 bit Integer"
      Case 21 GetTypeName = "unsigned 64 bit Integer"
      Case 101 GetTypeName = "Date/time value"
      Case 103 GetTypeName = "16 bit Char"
      Case Else
         GetTypeName = "Not supported"
   End Select
End Function

Requirements

Supported clients	Windows XP Embedded SP3 Windows Embedded Standard 2009 Windows Embedded Standard 7 SP1 WEPOS 1.1 SP3 POSReady 2009 Windows Embedded POSReady 7 Windows Fundamentals for Legacy PCs 7
MOF	EWFProvider.mof
Namespace	\root\Microsoft\WriteFilters

次の方法で共有