uint32 PressKey(
  [in]  uint32 keyCode
);

using System;
using System.Management;

namespace HyperVSamples
{
    class PressKeyClass
    {
        static ManagementObject GetComputerKeyboard(ManagementObject vm)
        {
            ManagementObjectCollection keyboardCollection = vm.GetRelated
            (
                "Msvm_Keyboard",
                "Msvm_SystemDevice",
                null,
                null,
                "PartComponent",
                "GroupComponent",
                false,
                null
            );

            ManagementObject keyboard = null;

            foreach (ManagementObject instance in keyboardCollection)
            {
                keyboard = instance;
                break;
            }

            return keyboard;
        }

        static void PressKey(string vmName, int keyCode)
        {
            ManagementScope scope = new ManagementScope(@"root\virtualization", null);
            ManagementObject vm = Utility.GetTargetComputer(vmName, scope);
            ManagementObject keyboard = GetComputerKeyboard(vm);

            ManagementBaseObject inParams = keyboard.GetMethodParameters("PressKey");

            inParams["keyCode"] = keyCode;

            ManagementBaseObject outParams = keyboard.InvokeMethod("PressKey", inParams, null);

            if ((UInt16)outParams["ReturnValue"] == ReturnCode.Completed)
            {
                string.Format("Key {0} was pressed on {1}", keyCode, vm["ElementName"]);
            }
            else
            {
                string.Format("Unable to press key {0}' on {1}", keyCode, vm["ElementName"]);
            }

            inParams.Dispose();
            outParams.Dispose();
            keyboard.Dispose();
            vm.Dispose();
        }

        static void Main(string[] args)
        {
            if (args != null && args.Length != 2)
            {
                Console.WriteLine("Usage: PressKey vmName keyCode");
                return;
            }
            string vmName = args[0];
            int keyCode = int.Parse(args[1]);
            PressKey(args[0], keyCode);
        }

    }
}

option explicit 

dim objWMIService
dim fileSystem
const wmiSuccessful = 0

Main()

'-----------------------------------------------------------------
' Main rountine
'-----------------------------------------------------------------
Sub Main()
    
    dim computer, objArgs, vmName, computerSystem, keycode, keyboard
    
    set fileSystem = Wscript.CreateObject("Scripting.FileSystemObject")

    computer = "."
    set objWMIService = GetObject("winmgmts:\\" & computer & "\root\virtualization")

    set objArgs = WScript.Arguments
    if WScript.Arguments.Count = 2 then
       vmName= objArgs.Unnamed.Item(0)
       keycode = objArgs.Unnamed.Item(1)
    else
       WScript.Echo "usage: cscript PressKey.vbs vmName keycode"
       WScript.Quit
    end if
    
    set computerSystem = GetComputerSystem(vmName)
    set keyboard = GetComputerKeyboard(computerSystem)

    if PressKey(keyboard, keycode) then

        WriteLog "Done"
        WScript.Quit(0)
    else
        WriteLog "PressKey failed"
        WScript.Quit(1)
    end if

End Sub

'-----------------------------------------------------------------
' Retrieve Msvm_VirtualComputerSystem from base on its ElementName
' 
'-----------------------------------------------------------------
Function GetComputerSystem(vmElementName)
    dim query
    On Error Resume Next
    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


'-----------------------------------------------------------------
' Retrieve Msvm_Keyboard from given computer system
' 
'-----------------------------------------------------------------
Function GetComputerKeyboard(computerSystem)
    dim query
    On Error Resume Next
    query = Format1("ASSOCIATORS OF {{0}} WHERE resultClass = Msvm_Keyboard", computerSystem.Path_.Path)
    set GetComputerKeyboard = 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

'-----------------------------------------------------------------
' Press the key with the given key code on the given keyboard
'-----------------------------------------------------------------
Function PressKey(keyboard, keyCode)
    WriteLog Format2("PressKey({0}, {1})", keyboard.ElementName, keyCode)
    
    dim objInParam, objOutParams
    
    PressKey = false
    set objInParam = keyboard.Methods_("PressKey").InParameters.SpawnInstance_()
    objInParam.keyCode = keyCode

    set objOutParams = keyboard.ExecMethod_("PressKey", objInParam)

    if objOutParams.ReturnValue = wmiSuccessful then
        WriteLog Format2("The key with code '{0}' is typed on {1}.", keyCode, keyboard.ElementName)
        PressKey = true
    end if

End Function

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

End Sub


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

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