You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
103 lines
4.0 KiB
103 lines
4.0 KiB
/*****************************************************************************
|
|
* (C) COPYRIGHT MICROSOFT CORPORATION, 2002
|
|
*
|
|
* AUTHOR: ByronC
|
|
*
|
|
* DATE: 3/22/2002
|
|
*
|
|
* @doc INTERNAL
|
|
*
|
|
* @module ClientEventTransport.h - Definitions for the client-side transport mechanism to receive events |
|
|
*
|
|
* This header file contains the definition for the ClientEventTransport
|
|
* class. It is used to shield the higher-level run-time event notification
|
|
* classes from the particulars of a specific transport mechanism.
|
|
*
|
|
*****************************************************************************/
|
|
|
|
//
|
|
// Defines
|
|
//
|
|
|
|
#define ClientEventTransport_UNINIT_SIG 0x556E7254
|
|
#define ClientEventTransport_INIT_SIG 0x496E7254
|
|
#define ClientEventTransport_TERM_SIG 0x546E7254
|
|
#define ClientEventTransport_DEL_SIG 0x446E7254
|
|
|
|
/*****************************************************************************
|
|
*
|
|
* @doc INTERNAL
|
|
*
|
|
* @class ClientEventTransport | Used to abstract implementation details of various transport mechanisms
|
|
*
|
|
* @comm
|
|
* This is a base class. It is used to shield the higher-level
|
|
* run-time event notification classes from the implmentation details of
|
|
* various transport mechanisms.
|
|
*
|
|
*****************************************************************************/
|
|
class ClientEventTransport
|
|
{
|
|
//@access Public members
|
|
public:
|
|
|
|
// @cmember Constructor
|
|
ClientEventTransport();
|
|
// @cmember Destructor
|
|
virtual ~ClientEventTransport();
|
|
|
|
// @cmember Initializes and creates any dependant objects
|
|
HRESULT virtual Initialize();
|
|
|
|
// @cmember Connect to the WIA Service
|
|
HRESULT virtual OpenConnectionToServer();
|
|
// @cmember Disconnect from the WIA Service
|
|
HRESULT virtual CloseConnectionToServer();
|
|
// @cmember Sets up the mechanism by which the client will receive notifications
|
|
HRESULT virtual OpenNotificationChannel();
|
|
// @cmember Tears down the mechanism by which the client receives notifications
|
|
HRESULT virtual CloseNotificationChannel();
|
|
|
|
// @cmember Informs service of client's specific registration/unregistration requests
|
|
HRESULT virtual SendRegisterUnregisterInfo(EventRegistrationInfo *pEventRegistrationInfo);
|
|
|
|
// @cmember Retrieves a HANDLE which callers can Wait on to receive event notifications
|
|
HANDLE virtual getNotificationHandle();
|
|
// @cmember Once an event occurs, this will retrieve the relevant data
|
|
HRESULT virtual FillEventData(WiaEventInfo *pWiaEventInfo);
|
|
|
|
//@access Private members
|
|
protected:
|
|
|
|
// @cmember Signature of class
|
|
ULONG m_ulSig;
|
|
|
|
// @cmember Handle to an event object used to signal caller that an event is ready for retrieval
|
|
HANDLE m_hPendingEvent;
|
|
|
|
//
|
|
// Comments for member variables
|
|
//
|
|
// @mdata ULONG | ClientEventTransport | m_ulSig |
|
|
// The signature for this class, used for debugging purposes.
|
|
// Doing a <nl>"db [addr_of_class]"<nl> would yield one of the following
|
|
// signatures for this class:
|
|
// @flag ClientEventTransport_UNINIT_SIG | 'TrnU' - Object has not been successfully
|
|
// initialized
|
|
// @flag ClientEventTransport_INIT_SIG | 'TrnI' - Object has been successfully
|
|
// initialized
|
|
// @flag ClientEventTransport_TERM_SIG | 'TrnT' - Object is in the process of
|
|
// terminating.
|
|
// @flag ClientEventTransport_INIT_SIG | 'TrnD' - Object has been deleted
|
|
// (destructor was called)
|
|
//
|
|
//
|
|
// @cmember HANDLE | ClientEventTransport | m_hPendingEvent |
|
|
// Handle to an event object used to signal caller that an event is ready for retrieval.
|
|
// Callers get this handle first via a call to <mf ClientEventTransport::getNotificationHandle>.
|
|
// They then wait on this handle until signaled, which indicates a WIA event has arrived
|
|
// and is ready for retrieval. The event information is then retrieved via a call to
|
|
// <mf ClientEventTransport::FillEventData>.
|
|
//
|
|
};
|
|
|