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DefineVirtualSystem method of the Msvm_VirtualSystemManagementService class

Hyper-V

Creates a new virtual computer system instance. Properties that are not specified will be populated with default values.

Syntax


uint32 DefineVirtualSystem(
  [in]  string                           SystemSettingData,
  [in]  string                           ResourceSettingData[],
  [in]  CIM_VirtualSystemSettingData REF SourceSetting,
  [out] CIM_ComputerSystem           REF DefinedSystem,
  [out] CIM_ConcreteJob              REF Job
);

Parameters

SystemSettingData [in]

Type: string

An embedded instance of the Msvm_VirtualSystemGlobalSettingData class. This parameter is required.

ResourceSettingData [in]

Type: string[]

An optional parameter that contains a number of embedded instances of the Msvm_ResourceAllocationSettingData class (or derived classes thereof). Together these instances describe the virtual resources of the virtual computer system. A default set of devices will be created for the virtual system regardless of whether this parameter is set. For example, processor and memory are automatically created and configured with default values.

SourceSetting [in]

Type: CIM_VirtualSystemSettingData

A reference to an existing instance of Msvm_VirtualSystemSettingData to use as a template for the new virtual computer system. The settings described in this object, as well as those in the associated Msvm_ResourceAllocationSettingData instances (via the Msvm_VirtualSystemSettingDataComponent association), will be reflected in the new virtual computer system.

DefinedSystem [out]

Type: CIM_ComputerSystem

A reference to the newly created virtual computer system.

Job [out]

Type: CIM_ConcreteJob

An optional reference that is returned if the operation is executed asynchronously. If present, the returned reference to an instance of Msvm_ConcreteJob can be used to monitor progress and to obtain the result of the method.

Return value

Type: uint32

If this method is executed synchronously, it returns 0 if it succeeds. If this method is executed asynchronously, it returns 4096 and the Job output parameter can be used to track the progress of the asynchronous operation. Any other return value indicates an error.

Remarks

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

Examples

The following C# sample creates a virtual system. The referenced utilities can be found in Common Utilities for the Virtualization Samples.

Important  To function correctly, the following code must be run on the VM host server, and must be run with Administrator privileges.

using System;
using System.Management;

namespace HyperVSamples
{
    class DefineVirtualSystemClass
    {
        static string GetVirtualSystemGlobalSettingDataInstance(ManagementScope scope)
        {
            ManagementPath settingPath = new ManagementPath("Msvm_VirtualSystemGlobalsettingData");

            ManagementClass globalSettingClass = new ManagementClass(scope, settingPath, null);
            ManagementObject globalSettingData = globalSettingClass.CreateInstance();
            globalSettingData["ElementName"] = "My First VM";

            string settingData = globalSettingData.GetText(TextFormat.CimDtd20);

            globalSettingData.Dispose();
            globalSettingClass.Dispose();

            return settingData;
        }

        static ManagementObject DefineVirtualSystem(string vmName)
        {
            ManagementObject definedSystem = null;
            ManagementScope scope = new ManagementScope(@"root\virtualization", null);
            ManagementObject virtualSystemService = Utility.GetServiceObject(scope, "Msvm_VirtualSystemManagementService");

            ManagementBaseObject inParams = virtualSystemService.GetMethodParameters("DefineVirtualSystem");
            inParams["ResourcesettingData"] = null;
            inParams["Sourcesetting"] = null;
            inParams["SystemsettingData"] = GetVirtualSystemGlobalSettingDataInstance(scope);

            ManagementBaseObject outParams = virtualSystemService.InvokeMethod("DefineVirtualSystem", inParams, null);

            if ((UInt32)outParams["ReturnValue"] == ReturnCode.Started)
            {
                if (Utility.JobCompleted(outParams, scope))
                {
                    definedSystem = new ManagementObject(outParams["DefinedSystem"].ToString());
                    Console.WriteLine("{0} was created successfully.", definedSystem["ElementName"]);
                }
                else
                {
                    Console.WriteLine("Failed to define virtual system");
                }
            }
            else if ((UInt32)outParams["ReturnValue"] == ReturnCode.Completed)
            {
                definedSystem = new ManagementObject(outParams["DefinedSystem"].ToString());
                Console.WriteLine("{0} was created successfully.", definedSystem["ElementName"]);
            }
            else
            {
                Console.WriteLine("Define virtual system failed with error {0}", outParams["ReturnValue"]);
            }

            inParams.Dispose();
            outParams.Dispose();
            virtualSystemService.Dispose();

            return definedSystem;
        }

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


The following VBScript sample creates a virtual system.

Important  To function correctly, the following code must be run on the VM host server, and must be run with Administrator privileges.

option explicit 

dim objWMIService
dim managementService
dim fileSystem


const JobStarting = 3
const JobRunning = 4
const JobCompleted = 7
const wmiStarted = 4096
const wmiSuccessful = 0

Main()


'-----------------------------------------------------------------
' Main
'-----------------------------------------------------------------
Sub Main()
    
    dim computer, objArgs, vmName
    set fileSystem = Wscript.CreateObject("Scripting.FileSystemObject")
    computer = "."
    set objWMIService = GetObject("winmgmts:\\" & computer & "\root\virtualization")
    set managementService = objWMIService.ExecQuery("select * from Msvm_VirtualSystemManagementService").ItemIndex(0)

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

    if DefineVirtualSystem(vmName) then
        WriteLog "Done"
        WScript.Quit(0)
    else
        WriteLog "DefineVirtualSystem failed."
        WScript.Quit(1)
    end if

End Sub

'-----------------------------------------------------------------
' Define a virtual system
'-----------------------------------------------------------------
Function DefineVirtualSystem(vmName)

    dim globalsettingData, objInParam, objOutParams, wmiStatus
    
    DefineVirtualSystem = false
    set globalsettingData = objWMIService.Get("Msvm_VirtualSystemGlobalsettingData").SpawnInstance_()
    globalsettingData.ElementName = vmName
    set objInParam = managementService.Methods_("DefineVirtualSystem").InParameters.SpawnInstance_()
    objInParam.ResourcesettingData = null
    objInParam.Sourcesetting = null
    objInParam.SystemsettingData = globalsettingData.GetText_(1)
    
    set objOutParams = managementService.ExecMethod_("DefineVirtualSystem", objInParam)
    
    wmiStatus = objOutParams.ReturnValue

    if objOutParams.ReturnValue = wmiStarted then
        if (WMIJobCompleted(objOutParams)) then
            DefineVirtualSystem = true
        end if
    elseif (objOutParams.ReturnValue = wmiSuccessful) then
        DefineVirtualSystem = true
    else
        WriteLog Format1("DefineVirtualSystem failed with ReturnValue {0}", objOutParams.ReturnValue)
    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(".\ADDSCSIContoller.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

Msvm_VirtualSystemManagementService

 

 

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