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CreateVirtualFloppyDisk method of the Msvm_ImageManagementService class

Hyper-V

Creates a virtual floppy disk (.vfd) file.

Syntax


uint32 CreateVirtualFloppyDisk(
  [in]   string Path,
  [out]  CIM_ConcreteJob REF Job
);

Parameters

Path [in]

Type: string

A fully qualified path that specifies the location of the new file.

Job [out]

Type: CIM_ConcreteJob

A reference to the job (can be null if the task is completed).

Return value

Type: uint32

This method can return one of the following values.

Completed with No Error (0)
Method Parameters Checked - JobStarted (4096)
Failed (32768)
Access Denied (32769)
Not Supported (32770)
Status is unknown (32771)
Timeout (32772)
Invalid parameter (32773)
System is in use (32774)
Invalid state for this operation (32775)
Incorrect data type (32776)
System is not available (32777)
Out of memory (32778)

Remarks

Access to the Msvm_ImageManagementService class might be restricted by UAC Filtering. For more information, see User Account Control and WMI.

Examples

The following C# example creates a virtual floppy disk file. The referenced utilities can be found in Common Utilities for the Virtualization Samples.


using System;
using System.Management;

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

            ManagementBaseObject inParams = imageService.GetMethodParameters("CreateVirtualFloppyDisk");
            inParams["Path"] = vhdPath;
            ManagementBaseObject outParams = imageService.InvokeMethod("CreateVirtualFloppyDisk", inParams, null);
            if ((UInt32)outParams["ReturnValue"] == ReturnCode.Started)
            {
                if (Utility.JobCompleted(outParams, scope))
                {
                    Console.WriteLine("{0} was created successfully.", inParams["Path"]);
                }
                else
                {
                    Console.WriteLine("Unable to create {0}", inParams["Path"]);
                }
            }

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

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



The following VBScript example creates a virtual floppy disk file.


option explicit 

dim objWMIService
dim managementService
dim fileSystem


const JobStarting = 3
const JobRunning = 4
const JobCompleted = 7
const wmiStarted = 4096

const method = "CreateVirtualFloppyDisk"
Main()

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

    dim computer, objArgs, vfdPath

    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
       vfdPath = objArgs.Unnamed.Item(0)
    else
       WScript.Echo "usage: cscript CreateVFD.vbs VFDFilePath "
       WScript.Quit(1)
    end if

    if CreateVirtualFloppyDisk(vfdPath) then
        WriteLog "Done"
        WScript.Quit(0)
    else
        WriteLog "CreateVFD failed"
        WScript.Quit(1)
    end if

End Sub

'-----------------------------------------------------------------
' Execute CreateVirtualFloppyDisk method
'-----------------------------------------------------------------
Function CreateVirtualFloppyDisk(vfdPath)
    WriteLog Format1("Function CreateVirtualFloppyDisk({0})",  vfdPath)
    
    dim objInParam, objOutParams

    CreateVirtualFloppyDisk = false

    set objInParam = managementService.Methods_("CreateVirtualFloppyDisk").InParameters.SpawnInstance_()
    objInParam.Path = vfdPath

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

    if (WMIMethodStarted(objOutParams)) then
        if (WMIJobCompleted(objOutParams)) then
            WriteLog Format1("VHD {0} was created successfully", vfdPath)
            CreateVirtualFloppyDisk = true
        end if
    end if

End Function


'-----------------------------------------------------------------
' Handle wmi return values
'-----------------------------------------------------------------
Function WMIMethodStarted(outParam)
    WriteLog "Function WMIMethodStarted"
    
    dim wmiStatus
    
    WMIMethodStarted = false

    if Not IsNull(outParam) then
        wmiStatus = outParam.ReturnValue

        if  wmiStatus = wmiStarted then
            WMIMethodStarted = true
        else
            WriteLog Format2("Failed to create VFD {0} ConcreteJob with error {1}", vfdPath, wmiStatus)
        end if
   end if

End Function

'-----------------------------------------------------------------
' Handle wmi Job object
'-----------------------------------------------------------------
Function WMIJobCompleted(outParam)
    WriteLog "Function WMIJobCompleted"
    dim WMIJob, jobState

    set WMIJob = objWMIService.Get(outParam.Job)

    WMIJobCompleted = true

    jobState = WMIJob.JobState

    while jobState = JobRunning or jobState = JobStarting
        WriteLog Format1("In progress... {0}% completed.",WMIJob.PercentComplete)
        WScript.Sleep(1000)
        set WMIJob = objWMIService.Get(outParam.Job)
        jobState = WMIJob.JobState
    wend

    if (jobState <> JobCompleted) then
        WriteLog Format1("ErrorCode:{0}", WMIJob.ErrorCode)
        WriteLog Format1("ErrorDescription:{0}", WMIJob.ErrorDescription)
        WMIJobCompleted = false
    end if

End Function

'-----------------------------------------------------------------
' Create the console log files.
'-----------------------------------------------------------------
Sub WriteLog(line)
    dim fileStream
    set fileStream = fileSystem.OpenTextFile(".\CreateVFD.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


Requirements

Minimum supported client

None supported

Minimum supported server

Windows Server 2008

End of client support

None supported

End of server support

Windows Server 2012

Namespace

\\.\Root\Virtualization

MOF

WindowsVirtualization.mof

See also

CreateVirtualFloppyDisk (V2)
CIM_ConcreteJob
Msvm_ImageManagementService

 

 

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