Setting Windows screensaver require password with powershell - windows

Question

I know that I can set screensaver values through the registry, but those apply at login. I gather the correct way is to use the SystemParametersInfo function, which then makes the changes apply immediately.
I am able to get and set the screensaver timeout values using the following:
$signature = #"
[DllImport("user32.dll")]
public static extern bool SystemParametersInfo(int uAction, int uParam, ref int lpvParam, int flags );
"#
$systemParamInfo = Add-Type -memberDefinition $signature -Name ScreenSaver -passThru
Function Get-ScreenSaverTimeout
{
[Int32]$value = 0
$systemParamInfo::SystemParametersInfo(14, 0, [REF]$value, 0)
$($value/60)
}
Function Set-ScreenSaverTimeout
{
Param ([Int32]$value)
$seconds = $value * 60
[Int32]$nullVar = 0
$systemParamInfo::SystemParametersInfo(15, $seconds, [REF]$nullVar, 2)
}
from https://powershellreflections.wordpress.com/2011/08/02/control-your-screensaver-with-powershell/
I am trying to change the flag for "On resume, display logon screen". Getting the value with the following is successful:
function Get-ScreenSaverSecure
{
[Int32]$value = 0
$systemParamInfo::SystemParametersInfo(118, 0, [REF]$value, 0)
$value
}
However, setting the value with:
Function Set-ScreenSaverSecure
{
[Int32]$nullVar = 0
$systemParamInfo::SystemParametersInfo(119, $true, [REF]$nullVar, 2)
}
does not set the flag. From the MSDN link, I think I should be passing SPI_SETSCREENSAVESECURE (which is uiParam 119) a $true or $false, depending on the mode, however neither seem to apply.
Any help is appreciated.

Answer 1

I used function by #Tim AtLee and tailored as follows:
Function Set-OnResumeDisplayLogon
{
Param ([Int32]$value)
[Int32]$nullVar = 0
$systemParamInfo::SystemParametersInfo(119, $value, [REF]$nullVar, 2)
}
then called by:
Set-OnResumeDisplayLogon(0)
to set the 'On resume, display logon' flag as unchecked; or
Set-OnResumeDisplayLogon(1)
to set the 'On resume, display logon' flag as checked