ModifyKvpItems method of the Msvm_VirtualSystemManagementService class
Modifies existing key-value pairs on a virtual machine.
Syntax
uint32 ModifyKvpItems(
[in] CIM_ComputerSystem REF TargetSystem,
[in] string DataItems[],
[out] CIM_ConcreteJob REF Job
);
Parameters
-
TargetSystem [in]
-
Type: CIM_ComputerSystem
A reference to the virtual machine on which the key-value pairs will be modified.
-
DataItems [in]
-
Type: string[]
An array of key-value pairs to be modified. Each element of the array is an embedded instance of the Msvm_KvpExchangeDataItem class. This method fails if any of the specified key-value pairs does not exist on the target system. This array can contain at most 128 elements.
-
Job [out]
-
Type: CIM_ConcreteJob
If the operation is performed asynchronously, this method will return 4096, and this parameter will contain a reference to an object derived from CIM_ConcreteJob.
Return value
Type: uint32
This method returns one of the following values.
-
Completed with No Error (0)
-
Method Parameters Checked - Job Started (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_VirtualSystemManagementService class might be restricted by UAC Filtering. For more information, see User Account Control and WMI.
Examples
The following C# sample modifies key-value pairs on a virtual machine. The referenced utilities can be found in Common utilities for the virtualization samples (V2).
Important
To function correctly, the following code must be run on the virtual machine host server, and must be run with Administrator privileges.
using System;
using System.Management;
namespace HyperVSamples
{
class ModifyKvpItemsClass
{
static void ModifyKvpItems(string vmName, string itemName, string itemValue)
{
ManagementScope scope = new ManagementScope(@"root\virtualization\v2", null);
ManagementObject virtualSystemService = Utility.GetServiceObject(scope, "Msvm_VirtualSystemManagementService");
ManagementBaseObject inParams = virtualSystemService.GetMethodParameters("ModifyKvpItems");
ManagementClass kvpExchangeDataItem = new ManagementClass(scope, new ManagementPath("Msvm_KvpExchangeDataItem"), null);
ManagementObject dataItem = kvpExchangeDataItem.CreateInstance();
dataItem["Data"] = itemValue;
dataItem["Name"] = itemName;
dataItem["Source"] = 0;
string[] dataItems = new string[1];
dataItems[0] = dataItem.GetText(TextFormat.CimDtd20);
ManagementObject vm = Utility.GetTargetComputer(vmName, scope);
inParams["TargetSystem"] = vm.Path.Path;
inParams["DataItems"] = dataItems;
ManagementBaseObject outParams = virtualSystemService.InvokeMethod("ModifyKvpItems", inParams, null);
if ((UInt32)outParams["ReturnValue"] == ReturnCode.Started)
{
if (Utility.JobCompleted(outParams, scope))
{
Console.WriteLine("KvpItems were modified successfully.");
}
else
{
Console.WriteLine("Failed to modify KvpItems");
}
}
else if ((UInt32)outParams["ReturnValue"] == ReturnCode.Completed)
{
Console.WriteLine("KvpItems were modified successfully.");
}
else
{
Console.WriteLine("Modify virtual system kvp items failed with error {0}", outParams["ReturnValue"]);
}
inParams.Dispose();
outParams.Dispose();
vm.Dispose();
dataItem.Dispose();
virtualSystemService.Dispose();
}
static void Main(string[] args)
{
if (args != null && args.Length != 3)
{
Console.WriteLine("Usage: ModifyKvpItems vmName itemName itemValue");
return;
}
ModifyKvpItems(args[0], args[1], args[2]);
}
}
}
The following Visual Basic Scripting Edition (VBScript) sample modifies key-value pairs on a virtual machine.
Important
To function correctly, the following code must be run on the virtual machine 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, vmName, itemName, itemValue, myVm, objArgs
set fileSystem = Wscript.CreateObject("Scripting.FileSystemObject")
computer = "."
set objWMIService = GetObject("winmgmts:\\" & computer & "\root\virtualization\v2")
set managementService = objWMIService.ExecQuery("select * from Msvm_VirtualSystemManagementService").ItemIndex(0)
set objArgs = WScript.Arguments
if WScript.Arguments.Count = 3 then
vmName = objArgs.Unnamed.Item(0)
itemName = objArgs.Unnamed.Item(1)
itemValue = objArgs.Unnamed.Item(2)
else
WScript.Echo "usage: cscript AddKvpItems.vbs vmName itemName itemValue"
WScript.Quit(1)
end if
set myVm = GetComputerSystem(vmName)
if ModifyKvpItems(myVm, itemName, itemValue) then
WriteLog "Done"
WScript.Quit(0)
else
WriteLog "ModifyKvpItems failed"
WScript.Quit(1)
end if
End Sub
'-----------------------------------------------------------------
' Retrieve Msvm_VirtualComputerSystem from base on its ElementName
'-----------------------------------------------------------------
Function GetComputerSystem(vmElementName)
On Error Resume Next
dim query
query = Format1("select * from Msvm_ComputerSystem where ElementName = '{0}'", vmElementName)
set GetComputerSystem = objWMIService.ExecQuery(query).ItemIndex(0)
if (Err.Number <> 0) then
WriteLog Format1("Err.Number: {0}", Err.Number)
WriteLog Format1("Err.Description:{0}",Err.Description)
WScript.Quit(1)
end if
End Function
'-----------------------------------------------------------------
' RemoveVirtualSystemResource
'-----------------------------------------------------------------
Function ModifyKvpItems(computerSystem, itemName, itemValue)
dim dataItem, dataItems, objInParam, objOutParams
ModifyKvpItems = false
set dataItem = objWMIService.Get("Msvm_KvpExchangeDataItem").SpawnInstance_()
dataItem.Data = itemValue
dataItem.Name = itemName
dataItem.Source = 0
dataItems = Array(1)
dataItems(0) = dataItem.GetText_(1)
set objInParam = managementService.Methods_("ModifyKvpItems").InParameters.SpawnInstance_()
objInParam.TargetSystem = computerSystem.Path_.Path
objInParam.dataItems = dataItems
set objOutParams = managementService.ExecMethod_("ModifyKvpItems", objInParam)
if objOutParams.ReturnValue = wmiStarted then
if (WMIJobCompleted(objOutParams)) then
ModifyKvpItems = true
end if
elseif objOutParams.ReturnValue = wmiSuccessful then
ModifyKvpItems = true
else
WriteLog Format1("ModifyKvpItems failed with {0}", objOutParams.ReturnValue)
end if
End Function
'-----------------------------------------------------------------
' Handle wmi Job object
'-----------------------------------------------------------------
Function WMIJobCompleted(outParam)
dim WMIJob, jobState
WMIJobCompleted = true
set WMIJob = objWMIService.Get(outParam.Job)
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 (WMIJob.JobState <> JobCompleted) then
WriteLog Format1("ErrorDescription:{0}", WMIJob.ErrorDescription)
WriteLog Format1("ErrorCode:{0}", WMIJob.ErrorCode)
WMIJobCompleted = false
end if
End Function
'-----------------------------------------------------------------
' Create the console log files.
'-----------------------------------------------------------------
Sub WriteLog(line)
dim fileStream
set fileStream = fileSystem.OpenTextFile(".\ModifyKvpItems.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
| Requirement | Value |
|---|---|
| Minimum supported client |
Windows 8 [desktop apps only] |
| Minimum supported server |
Windows Server 2012 [desktop apps only] |
| Namespace |
Root\Virtualization\V2 |
| MOF |
|
| DLL |
|