MSDN 上说的很清楚的：The DeleteService function s a service for deletion from the service control manager database. The database entry is not removed until all open handles to the service have been closed by calls to the CloseServiceHandle function, and the service is not running. A running service is stopped by a call to the ControlService function with the SERVICE_CONTROL_STOP control code. If the service cannot be stopped, the database entry is removed when the system is restarted. The service control manager deletes the service by deleting the service key and its subkeys from the registry.
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