Unmount method of the Msvm_ImageManagementService class

uint32 Unmount(
  [in]  string Path
);

using System;
using System.Management;

namespace HyperVSamples
{
    class UnmountVHD
    {
        static void Unmount(string vhdPath)
        {
            ManagementScope scope = new ManagementScope(@"root\virtualization", null);
            ManagementObject imageService = Utility.GetServiceObject(scope, "Msvm_ImageManagementService");

            ManagementBaseObject inParams = imageService.GetMethodParameters("Unmount");
            inParams["Path"] = vhdPath;
            ManagementBaseObject outParams = imageService.InvokeMethod("Unmount", inParams, null);
            if ((UInt32)outParams["ReturnValue"] == ReturnCode.Completed)
            {
                Console.WriteLine("{0} was unmounted successfully.", inParams["Path"]);
            }
            else
            {
                Console.WriteLine("Unmount operation for {0} failed with error {1}.", vhdPath, outParams["ReturnValue"]);
            }

            inParams.Dispose();
            outParams.Dispose();
            imageService.Dispose();
        }

        static void Main(string[] args)
        {
            if (args != null && args.Length != 1)
            {
                Console.WriteLine("Usage: UnmountVHD vhdPath");
                return;
            }
            Unmount(args[0]);
        }
    }
}

option explicit 

dim objWMIService
dim vhdPath
dim managementService
dim fileSystem

const wmiCompleted = 0

Main()

'-----------------------------------------------------------------
' Main
'-----------------------------------------------------------------
Sub Main()

    dim objArgs, computer
    set fileSystem = Wscript.CreateObject("Scripting.FileSystemObject")

    computer = "."
    set objWMIService = GetObject("winmgmts:\\" & computer & "\root\virtualization")
    set managementService = objWMIService.ExecQuery("Select * from Msvm_ImageManagementService").ItemIndex(0)

    set objArgs = WScript.Arguments
    if WScript.Arguments.Count = 1 then
        vhdPath = objArgs.Unnamed.Item(0)
    else
        WScript.Echo "usage: cscript unmountVHD.vbs vhdPath"
        WScript.Quit(1)
    end if


    if ExecuteUnmountVHD then
        WriteLog "Done"
        WScript.Quit(0)
    else
        WriteLog "Unmount operation failed."
        WScript.Quit(1)
    end if

End Sub

'-----------------------------------------------------------------
' ExecuteUnmountVHD
'-----------------------------------------------------------------
Function ExecuteUnmountVHD ()

    WriteLog Format1("Sub ExecuteUnmountVHD ({0})",  vhdPath)
    
    dim objInParam, objOutParams

    ExecuteUnmountVHD = false

    set objInParam = managementService.Methods_("Unmount").InParameters.SpawnInstance_()
    objInParam.Path = vhdPath

    set objOutParams = managementService.ExecMethod_("Unmount", objInParam)

    if  objOutParams.ReturnValue = wmiCompleted then
        ExecuteUnmountVHD = true
        WriteLog Format1("{0} was unmounted successfully.", vhdPath)
    else
        WriteLog Format2("Unmount operation for {0} failed with error {1}", vhdPath, objOutParams.ReturnValue)
    end if
    
End Function

'-----------------------------------------------------------------
' Create the console log files.
'-----------------------------------------------------------------
Sub WriteLog(line)
    dim fileStream
    set fileStream = fileSystem.OpenTextFile(".\UnmountVHD.log", 8, true)
    WScript.Echo line
    fileStream.WriteLine line
    fileStream.Close
End Sub

'------------------------------------------------------------------------------
' The string formatting functions to avoid string concatenation.
'------------------------------------------------------------------------------
Function Format2(myString, arg0, arg1)
    Format2 = Format1(myString, arg0)
    Format2 = Replace(Format2, "{1}", arg1)
End Function

'------------------------------------------------------------------------------
' The string formatting functions to avoid string concatenation.
'------------------------------------------------------------------------------
Function Format1(myString, arg0)
    Format1 = Replace(myString, "{0}", arg0)
End Function