415 lines
10 KiB
C++
415 lines
10 KiB
C++
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/*****************************************************************************
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*
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* (C) COPYRIGHT MICROSOFT CORPORATION, 1999 - 2001
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*
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* TITLE: preview.cpp
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*
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* VERSION: 1.0
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*
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* AUTHOR: RickTu
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*
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* DATE: 10/30/99
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*
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* DESCRIPTION: Implements preview class for directshow devices in WIA
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*
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*****************************************************************************/
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#include "precomp.h"
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#pragma hdrstop
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VOID CALLBACK PreviewTimerProc( HWND hDlg, UINT uMsg, UINT_PTR idEvent, DWORD dwTime )
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{
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switch (idEvent)
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{
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case TIMER_CLOSE_DIALOG:
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WIA_TRACE((TEXT("PreviewTimerProc -- got TIMER_CLOSE_DIALOG")));
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EndDialog( hDlg, -2 );
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break;
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}
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}
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/*****************************************************************************
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PreviewDialogProc
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Dialog proc for preview dialog.
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*****************************************************************************/
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INT_PTR CALLBACK PreviewDialogProc( HWND hDlg, UINT uMsg, WPARAM wParam, LPARAM lParam )
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{
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switch (uMsg)
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{
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case WM_INITDIALOG:
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{
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WIA_TRACE((TEXT("PreviewDialogProc -- WM_INITDIALOG")));
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SetTimer( hDlg, TIMER_CLOSE_DIALOG, 30000, PreviewTimerProc );
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PREVIEW_INFO_STRUCT * ppis = reinterpret_cast<PREVIEW_INFO_STRUCT *>(lParam);
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if (ppis)
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{
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ppis->hDlg = hDlg;
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if (ppis->hEvent)
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{
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SetEvent( ppis->hEvent );
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}
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}
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}
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return TRUE;
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case PM_GOAWAY:
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WIA_TRACE((TEXT("PreviewDialogProc -- PM_GOAWAY")));
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EndDialog( hDlg, 0 );
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return TRUE;
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}
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return FALSE;
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}
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/*****************************************************************************
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PreviewThreadProc
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We spin a thread to put up the status dialog
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*****************************************************************************/
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DWORD WINAPI PreviewThreadProc( LPVOID lpv )
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{
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INT_PTR iRes;
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WIA_TRACE((TEXT("PreviewThreadProc enter")));
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iRes = DialogBoxParam( _Module.m_hInst,
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MAKEINTRESOURCE(IDD_INIT_DEVICE),
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NULL,
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PreviewDialogProc,
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reinterpret_cast<LPARAM>(lpv)
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);
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WIA_TRACE((TEXT("IDD_INIT_DEVICE dialog returned %d"),iRes));
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#ifdef DEBUG
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if (iRes==-1)
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{
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WIA_ERROR((TEXT("DialogBoxParam failed w/GLE = %d"),GetLastError()));
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}
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#endif
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if (iRes < 0)
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{
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PREVIEW_INFO_STRUCT * ppis = reinterpret_cast<PREVIEW_INFO_STRUCT *>(lpv);
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if (ppis && ppis->hEvent)
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{
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SetEvent( ppis->hEvent );
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}
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}
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WIA_TRACE((TEXT("PreviewThreadProc exit")));
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return 0;
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}
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/*****************************************************************************
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CVideoPreview::Device
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Hand us a device pointer for the camera (or DS device) we're connected to.
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*****************************************************************************/
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STDMETHODIMP
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CVideoPreview::Device(IUnknown * pDevice)
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{
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HRESULT hr = S_OK;
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WIA_PUSHFUNCTION((TEXT("CVideoPreview::Device")));
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// Create the WiaVideo object
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hr = CoCreateInstance(CLSID_WiaVideo, NULL, CLSCTX_INPROC_SERVER,
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IID_IWiaVideo, (LPVOID *)&m_pWiaVideo);
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WIA_CHECK_HR(hr,"CoCreateInstance( WiaVideo )");
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m_pDevice = pDevice;
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// if we've already been created, redo everything
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if (m_bCreated)
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{
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BOOL bDummy;
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OnCreate(WM_CREATE, 0, 0, bDummy);
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}
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return hr;
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}
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/*****************************************************************************
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CVideoPreview::InPlaceDeactivate
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Trap in place deactivate so we can unhook the dshow preview window from
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ours before both are destroyed.
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*****************************************************************************/
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STDMETHODIMP
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CVideoPreview::InPlaceDeactivate()
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{
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HRESULT hr = E_FAIL;
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WIA_PUSHFUNCTION((TEXT("CVideoPreview::InPlaceDeactivate")));
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//
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// Make sure we have a pointer to the device...
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//
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if (m_pWiaVideo.p)
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{
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//
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// Tell the device to close the graph
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//
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m_pWiaVideo->DestroyVideo();
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m_pWiaVideo = NULL;
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}
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else
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{
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WIA_ERROR((TEXT("m_pWiaVideo is NULL")));
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}
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//
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// Always return S_OK so that InPlaceDeactivate happens.
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//
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return S_OK;
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}
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/*****************************************************************************
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CVideoPreview::OnSize
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Called when our window is resized. We want to let the streaming
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preview know we've been resized so it can reposition itself accordingly.
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*****************************************************************************/
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LRESULT
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CVideoPreview::OnSize(UINT , WPARAM , LPARAM lParam, BOOL& )
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{
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WIA_PUSHFUNCTION((TEXT("CVideoPreview::OnSize")));
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if (m_pWiaVideo)
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{
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m_pWiaVideo->ResizeVideo(FALSE);
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}
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else
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{
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WIA_ERROR((TEXT("m_pWiaVideo is NULL!")));
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}
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return 0;
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}
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LRESULT
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CVideoPreview::OnCreate(UINT uMsg, WPARAM wp, LPARAM lp, BOOL &bHandled)
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{
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HRESULT hr = S_OK;
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WIA_PUSHFUNCTION(TEXT("CVideoPreview::OnCreate"));
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WIA_ASSERT(::IsWindow(m_hWnd));
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if (m_pDevice.p && m_pWiaVideo.p)
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{
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HANDLE hThread = NULL;
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DWORD dwId = 0;
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PREVIEW_INFO_STRUCT pis;
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//
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// Creating the graph can be quite time consuming, so put up
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// a dialog if it takes more than a couple of seconds. We start
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// a thread so that the UI doesn't hang, and that thread
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// puts up UI saying the device may take a while to initialize.
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//
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pis.hDlg = NULL;
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pis.hEvent = CreateEvent( NULL, FALSE, FALSE, NULL );
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hThread = CreateThread( NULL, 0, PreviewThreadProc, reinterpret_cast<LPVOID>(&pis), 0, &dwId );
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//
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// Tell the device to build the DShow graph
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//
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BOOL bSuccess = TRUE;
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HWND hwndFore = ::GetForegroundWindow();
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HWND hwndFocus = ::GetFocus();
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CSimpleString strDeviceID;
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CSimpleString strImagesDirectory;
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CComQIPtr<IWiaItem, &IID_IWiaItem> pRootDevice(m_pDevice);
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if (pRootDevice == NULL)
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{
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hr = E_FAIL;
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bSuccess = FALSE;
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}
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//
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// Get the WIA Device ID
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//
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if (bSuccess)
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{
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bSuccess = PropStorageHelpers::GetProperty(pRootDevice,
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WIA_DIP_DEV_ID,
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strDeviceID);
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}
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//
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// Get the directory the images will be stored in.
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//
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if (bSuccess)
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{
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bSuccess = PropStorageHelpers::GetProperty(pRootDevice,
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WIA_DPV_IMAGES_DIRECTORY,
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strImagesDirectory);
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}
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//
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// Create the Video if it isn't already created.
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if (bSuccess)
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{
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if (hr == S_OK)
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{
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WIAVIDEO_STATE VideoState = WIAVIDEO_NO_VIDEO;
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//
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// Get the current state of the WiaVideo object. If we
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// just created it then the state will be NO_VIDEO,
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// otherwise, it could already be previewing video,
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// in which case we shouldn't do anything.
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//
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hr = m_pWiaVideo->GetCurrentState(&VideoState);
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if (VideoState == WIAVIDEO_NO_VIDEO)
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{
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//
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// Set the directory we want to save our images to.
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// We got the image directory from the Wia Video Driver
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// IMAGES_DIRECTORY property
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//
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if (hr == S_OK)
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{
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hr = m_pWiaVideo->put_ImagesDirectory(CSimpleBStr(strImagesDirectory));
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}
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//
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// Create the video preview as a child of the hwnd
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// and automatically begin playback after creating the preview.
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//
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if (hr == S_OK)
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{
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hr = m_pWiaVideo->CreateVideoByWiaDevID(CSimpleBStr(strDeviceID),
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m_hWnd,
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FALSE,
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TRUE);
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}
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}
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}
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}
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if (!bSuccess)
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{
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hr = E_FAIL;
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}
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if (FAILED(hr))
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{
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//
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// Let the user know that the graph is most likely already
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// in use...
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//
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::MessageBox( NULL,
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CSimpleString(IDS_VIDEO_BUSY_TEXT, _Module.m_hInst),
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CSimpleString(IDS_VIDEO_BUSY_TITLE, _Module.m_hInst ),
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MB_OK | MB_ICONWARNING | MB_TOPMOST | MB_SETFOREGROUND
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);
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}
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//
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// Restore foreground window & focus, as it seems the
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// active movie window does not preserve these things...
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//
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if (hwndFore)
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{
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::SetForegroundWindow( hwndFore );
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}
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if (hwndFocus)
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{
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::SetFocus(hwndFocus);
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}
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//
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// Tell the dialog to go away
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//
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if (hThread)
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{
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if (pis.hEvent)
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{
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//
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// Wait for 45 seconds
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//
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WaitForSingleObject( pis.hEvent, 45 * 1000 );
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if (pis.hDlg)
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{
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::PostMessage( pis.hDlg, PM_GOAWAY, 0, 0 );
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}
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CloseHandle( pis.hEvent );
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pis.hEvent = NULL;
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}
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CloseHandle( hThread );
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hThread = NULL;
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}
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}
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bHandled = TRUE;
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m_bCreated = TRUE;
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return 0;
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}
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LRESULT
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CVideoPreview::OnEraseBkgnd(UINT uMsg, WPARAM wp, LPARAM lp, BOOL &bHandled)
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{
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HDC hdc = (HDC)wp;
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RECT rc;
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GetClientRect(&rc);
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SetBkColor(hdc, GetSysColor(COLOR_WINDOW));
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ExtTextOut(hdc, 0, 0, ETO_OPAQUE, &rc, NULL, 0, NULL);
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bHandled = TRUE;
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return TRUE;
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}
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