Windows服务编写原理及探讨【3】
（三）对服务的深入讨论之下
现在我们还剩下一个函数可以在细节上讨论，那就是服务的CtrlHandler函数。
当调用RegisterServiceCtrlHandler函数时，SCM得到并保存这个回调函数的地址。一个SCP调一个告诉SCM如何去控制服务的Win32函数，现在已经有10个预定义的控制请求：
Control codeMeaning
SERVICE_CONTROL_STOPRequests the service to stop. The hService handle must have SERVICE_STOP access.
SERVICE_CONTROL_PAUSERequests the service to pause. The hService handle must have SERVICE_PAUSE_CONTINUE access.
SERVICE_CONTROL_CONTINUERequests the paused service to resume. The hService handle must have SERVICE_PAUSE_CONTINUE access.
SERVICE_CONTROL_INTERROGATERequests the service to update immediately its current status information to the service control manager. The hService handle must have SERVICE_INTERROGATE access.
SERVICE_CONTROL_SHUTDOWNRequests the service to perform cleanup tasks, because the system is shutting down. For more information, see Remarks.
SERVICE_CONTROL_PARAMCHANGEWindows 2000: Requests the service to reread its startup parameters. The hService handle must have SERVICE_PAUSE_CONTINUE access.
SERVICE_CONTROL_NETBINDCHANGEWindows 2000: Requests the service to update its network binding. The hService handle must have SERVICE_PAUSE_CONTINUE access.
SERVICE_CONTROL_NETBINDREMOVEWindows 2000: Notifies a network service that a component for binding has been removed. The service should reread its binding information and unbind from the removed component.
SERVICE_CONTROL_NETBINDENABLEWindows 2000: Notifies a network service that a disabled binding has been enabled. The service should reread its binding information and add the new binding.
SERVICE_CONTROL_NETBINDDISABLEWindows 2000: Notifies a network service that one of its bindings has been disabled. The service should reread its binding information and remove the binding.
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