130 lines
2.9 KiB
C++
130 lines
2.9 KiB
C++
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/*****************************************************************************
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*
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* (C) COPYRIGHT MICROSOFT CORPORATION, 2000
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*
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* TITLE: WiaEvent.cpp
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*
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* VERSION: 1.0
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*
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* DATE: 2000/11/14
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*
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* DESCRIPTION: Implements callback for receiving WIA events.
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*
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*****************************************************************************/
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#include <stdafx.h>
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#include "wiavideotest.h"
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///////////////////////////////
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// Constructor
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//
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CWiaEvent::CWiaEvent(void) :
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m_cRef(0)
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{
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}
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///////////////////////////////
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// Destructor
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//
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CWiaEvent::~CWiaEvent(void)
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{
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}
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///////////////////////////////
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// QueryInterface
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//
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STDMETHODIMP CWiaEvent::QueryInterface(REFIID riid,
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LPVOID *ppvObject )
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{
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if (IsEqualIID(riid, IID_IUnknown))
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{
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*ppvObject = static_cast<IWiaEventCallback*>(this);
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}
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else if (IsEqualIID(riid, IID_IWiaEventCallback))
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{
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*ppvObject = static_cast<IWiaEventCallback*>(this);
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}
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else
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{
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*ppvObject = NULL;
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return E_NOINTERFACE;
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}
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reinterpret_cast<IUnknown*>(*ppvObject)->AddRef();
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return S_OK;
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}
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///////////////////////////////
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// AddRef
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//
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STDMETHODIMP_(ULONG) CWiaEvent::AddRef(void)
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{
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return InterlockedIncrement(&m_cRef);
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}
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///////////////////////////////
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// Release
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//
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STDMETHODIMP_(ULONG) CWiaEvent::Release(void)
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{
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LONG nRefCount = InterlockedDecrement(&m_cRef);
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if (!nRefCount)
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{
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delete this;
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}
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return nRefCount;
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}
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///////////////////////////////
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// ImageEventCallback
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//
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STDMETHODIMP CWiaEvent::ImageEventCallback(const GUID *pEventGUID,
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BSTR bstrEventDescription,
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BSTR bstrDeviceID,
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BSTR bstrDeviceDescription,
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DWORD dwDeviceType,
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BSTR bstrFullItemName,
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ULONG *pulEventType,
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ULONG ulReserved)
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{
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HRESULT hr = S_OK;
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if (pEventGUID == NULL)
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{
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return E_POINTER;
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}
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if (IsEqualIID(*pEventGUID, WIA_EVENT_ITEM_CREATED))
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{
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hr = ImageLst_PostAddImageRequest(bstrFullItemName);
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}
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else if (IsEqualIID(*pEventGUID, WIA_EVENT_ITEM_DELETED))
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{
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// do nothing for now.
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}
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else if (IsEqualIID(*pEventGUID, WIA_EVENT_DEVICE_CONNECTED))
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{
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WiaProc_PopulateDeviceList();
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}
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else if (IsEqualIID(*pEventGUID, WIA_EVENT_DEVICE_DISCONNECTED))
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{
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//
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// Simulate a push of the DestroyVideo Button.
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//
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VideoProc_ProcessMsg(IDC_BUTTON_DESTROY_VIDEO);
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AppUtil_MsgBox(IDS_DISCONNECTED, IDS_VIDEO_STREAM_SHUTDOWN,
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MB_OK | MB_ICONINFORMATION);
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WiaProc_PopulateDeviceList();
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}
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return S_OK;
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}
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