How to open and send keys in Calculator and Add operation in Powershell

 Add-Type –AssemblyName UIAutomationClient

Add-Type –AssemblyName UIAutomationTypes

$calc = [Diagnostics.Process]::Start('calc')

#wait for the UI to appear

$null = $calc.WaitForInputIdle(5000)

sleep –s 2

$calcWindowId = ((Get-Process).where{$_.MainWindowTitle -eq 'Calculator'})[0].Id

$root = [Windows.Automation.AutomationElement]::RootElement

$condition = New-Object Windows.Automation.PropertyCondition([Windows.Automation.AutomationElement]::ProcessIdProperty, $calcWindowId)

$calcUI = $root.FindFirst([Windows.Automation.TreeScope]::Children, $condition)

function FindAndClickButton($name){

$condition1 = New-Object Windows.Automation.PropertyCondition([Windows.Automation.AutomationElement]::ClassNameProperty, "Button")

$condition2 = New-Object Windows.Automation.PropertyCondition([Windows.Automation.AutomationElement]::NameProperty, $name)

$condition = New-Object Windows.Automation.AndCondition($condition1, $condition2)

$button = $calcUI.FindFirst([Windows.Automation.TreeScope]::Descendants, $condition)

$button.GetCurrentPattern([Windows.Automation.InvokePattern]::Pattern).Invoke()

}

#get and click the buttons for the calculation

FindAndClickButton Five

FindAndClickButton Plus

FindAndClickButton Nine

FindAndClickButton Equals

#get the result

$condition = New-Object Windows.Automation.PropertyCondition([Windows.Automation.AutomationElement]::AutomationIdProperty, "CalculatorResults")

$result = $calcUI.FindFirst([Windows.Automation.TreeScope]::Descendants, $condition)

$result.current.name