I know the ExitWindowsEx() API function which simply shuts down Windows. But as far as I know, you cannot make Windows install any pending updates with it.
Is there any API support for installing any pending updates (in that standard blue screen which says "n of m updates have installed - Please don't turn off or unplug your PC, Windows will shut down itself") then shutting down Windows (equivalent to clicking the "Install updates and shutdown" menu option of the Windows user interface)?
(OS Version: Windows XP and higher.)
The best you can do is call InitiateShutdown and include the SHUTDOWN_INSTALL_UPDATES flag on Vista and higher. Windows XP does not support programmatically shutting down with updates.
来源：https://stackoverflow.com/questions/14505648/is-there-any-api-function-for-shutting-down-windows-while-installing-any-pending