Cocoa - Force User To Switch?

Question

I am building a mac application, that at a certain time, needs to switch the currently logged in user to a different, preset one. Essentially a modified login window.

Is there a way to do this using cocoa?

-- Ari

Edit: Is there a way to not require the user to input their password?

Answer 1

Before I say my solution, I want to say that @jrodatus's answer is excellent, it just is for a slightly different use case.

I came up with this little applescript:

set theUser to "user"
set theUser to do shell script "/usr/bin/id -u " & theUser
set password to "pswd"
do shell script "/System/Library/CoreServices/Menu\\ Extras/User.menu/Contents/Resources/CGSession -switchToUserID " & theUser
repeat
    try
        tell application "System Events"
            repeat until visible of process "SecurityAgent" is false
                set visible of process "SecurityAgent" to false
            end repeat
            keystroke password
            keystroke return
        end tell
        exit repeat
    on error
        tell application "System Events"
        end tell
    end try
end repeat

This simply triggers the login screen, with -switchToUserID set to the username's user id. Then when at least one window of SecurityAgent (The login screen) is visible, simulate the keystroke of the password, then enter the result is when run the login window opens, with the password typed in. Also, this has no delays.