Virtual PC Guy's WebLog

Option Explicit

'Setup constant to use for getting the right value for the new VHD size

const Size1G = &H40000000

Dim HyperVServer

Dim VHDName

Dim VHDSize

Dim WMIService

Dim Msvm_ImageManagementService

Dim Result

Dim Job

Dim InParam

Dim OutParam

'Prompt for the Hyper-V Server to use

HyperVServer = InputBox("Specify the Hyper-V Server to create the dynamic virtual hard disk on:")

'Get name for VHD

VHDName = InputBox("Specify the name of the new dynamic virtual hard disk:")

'Get size for VHD

VHDSize = InputBox("Specify the size of the new dynamic virtual hard disk (in GB):") * Size1G

'Get an instance of the WMI Service in the virtualization namespace.

Set WMIService = GetObject("winmgmts:\\" & HyperVServer & "\root\virtualization")

'Get the Msvm_ImageManagementService object

Set Msvm_ImageManagementService = WMIService.ExecQuery("SELECT * FROM Msvm_ImageManagementService").ItemIndex(0)

'Setup the input parameter list

Set InParam = Msvm_ImageManagementService.Methods_("CreateDynamicVirtualHardDisk").InParameters.SpawnInstance_()

InParam.Path = VHDName 

InParam.MaxInternalSize = VHDSize

'Execute the method and store the results in OutParam

Set OutParam = Msvm_ImageManagementService.ExecMethod_("CreateDynamicVirtualHardDisk", InParam) 

'Check to see if the job completed synchronously

if (OutParam.ReturnValue = 0) then

   Wscript.Echo "The virtual hard disk has been created."

elseif (OutParam.ReturnValue <> 4096) then

   Wscript.Echo "The virtual hard disk has not been created."

else   

   'Get the job object

   set Job = WMIService.Get(OutParam.Job)

    'Wait for the job to complete (3 == starting, 4 == running)

   while (Job.JobState = 3) or (Job.JobState = 4)

      Wscript.Echo "Creating VHD. " & Job.PercentComplete & "% complete"

      WScript.Sleep(1000)

      'Refresh the job object

      set Job = WMIService.Get(OutParam.Job)

   Wend

   'Provide details if the job fails (7 == complete)

   if (Job.JobState <> 7) then

      Wscript.Echo "The virtual hard disk has not been created."

      Wscript.Echo "ErrorCode:" & Job.ErrorCode

      Wscript.Echo "ErrorDescription:" & Job.ErrorDescription

   else

      Wscript.Echo "The virtual hard disk has been created."

   end If

end if

# Setup constant to use for getting the right value for the new VHD size

[UInt64]$Size1G = 0x40000000

# Prompt for the Hyper-V Server to use

$HyperVServer = Read-Host "Specify the Hyper-V Server to use (enter '.' for the local computer)"

# Get name for VHD

$VHDName = Read-Host "Specify the name of the new dynamic virtual hard disk"

# Get size for VHD

[UInt64]$VHDSize = Read-Host "Specify the size of the new dynamic virtual hard disk (in GB)" 

# Get the Msvm_ImageManagementService object

$ImageManagementService = gwmi Msvm_ImageManagementService -namespace "root\virtualization" -computername $HyperVServer

# Compact the VHD

$result = $ImageManagementService.CreateDynamicVirtualHardDisk($VHDName, $VHDSize * $Size1G)

#Return success if the return value is "0"

if ($Result.ReturnValue -eq 0)

   {write-host "The virtual hard disk has been created."} 

#If the return value is not "0" or "4096" then the operation failed

ElseIf ($Result.ReturnValue -ne 4096)

   {write-host "The virtual hard disk has not been created.  Error value:" $Result.ReturnValue}

  Else

   {#Get the job object

    $job=[WMI]$Result.job

    #Provide updates if the jobstate is "3" (starting) or "4" (running)

    while ($job.JobState -eq 3 -or $job.JobState -eq 4)

      {write-host "Creating. "$job.PercentComplete "% complete"

       start-sleep 1

       #Refresh the job object

       $job=[WMI]$Result.job}

     #A jobstate of "7" means success

    if ($job.JobState -eq 7)

       {write-host "The virtual hard disk has been created."}

      Else

       {write-host "The virtual hard disk has not been created."

        write-host "ErrorCode:" $job.ErrorCode

        write-host "ErrorDescription" $job.ErrorDescription}

   }