cmediabookmarker.cpp

Windows Media Player CE SDK示范程序, EVC4下的程序。

	}

	return 0;
}

// OnPlay: Starts playback.

LRESULT CMediaBookmarker::OnPlay(WORD wNotifyCode, WORD wID, HWND hWndCtl, BOOL& bHandled)
{
	m_spWMPPlayer->Play();
	return 0;
}

// OnPause: Pauses playback.

LRESULT CMediaBookmarker::OnPause(WORD wNotifyCode, WORD wID, HWND hWndCtl, BOOL& bHandled)
{
	m_spWMPPlayer->Pause();
	return 0;
}

// OnStop: Stops playback.

LRESULT CMediaBookmarker::OnStop(WORD wNotifyCode, WORD wID, HWND hWndCtl, BOOL& bHandled)
{
	m_spWMPPlayer->Stop();
	return 0;
}

// OnFastForward: Sets the current media position forward by five seconds.

LRESULT CMediaBookmarker::OnFastForward(WORD wNotifyCode, WORD wID, HWND hWndCtl, BOOL& bHandled)
{
	double dCurrentPosition;
	double dDuration;

	if (SUCCEEDED(m_spWMPPlayer->get_CurrentPosition(&dCurrentPosition)))
	{
		if (SUCCEEDED(m_spWMPPlayer->get_Duration(&dDuration)) && dCurrentPosition+5 < dDuration)
		{
			m_spWMPPlayer->put_CurrentPosition(dCurrentPosition + 5);
		}
	}
	return 0;
}

// OnFastReverse: Sets the current media position back by five seconds.

LRESULT CMediaBookmarker::OnFastReverse(WORD wNotifyCode, WORD wID, HWND hWndCtl, BOOL& bHandled)
{
	double dCurrentPosition;
	double dDuration;

	if (SUCCEEDED(m_spWMPPlayer->get_CurrentPosition(&dCurrentPosition)))
	{
		if (SUCCEEDED(m_spWMPPlayer->get_Duration(&dDuration)) && dCurrentPosition-5 < dDuration)
		{
			m_spWMPPlayer->put_CurrentPosition(dCurrentPosition - 5);
		}
	}
	return 0;
}

// PlayMedia: Opens the specified media file and plays it from the specified position.

BOOL CMediaBookmarker::PlayMedia(TCHAR *szFile, double dPosition)
{
	TCHAR* szFilename;
	const int BACKSLASH = TEXT('\\');
	int iPathLength;
	int iFilenameLength;

	// Stop the Player (in case it is paused).
	if (FAILED(m_spWMPPlayer->Stop()))
	{
		return FALSE;
	}

	// Turn off AutoStart so the position can be set before the media plays.
	if (FAILED(m_spWMPPlayer->put_AutoStart(FALSE)))
	{
		return FALSE;
	}

	// Set the file name.
	if (FAILED(m_spWMPPlayer->put_FileName(szFile)))
	{
		return FALSE;
	} 

	// Set the current position.
	if (FAILED(m_spWMPPlayer->put_CurrentPosition(dPosition)))
	{
		return FALSE;
	}

	// Play the file.
	if (FAILED(m_spWMPPlayer->Play()))
	{
		return FALSE;
	}

	// Store the current file name without the path information.
	if (NULL != m_szCurrentFile)
	{
		delete[] m_szCurrentFile;
		m_szCurrentFile = NULL;
	}
	m_szCurrentFile = new TCHAR[MAX_MARKLENGTH];
	if (NULL != m_szCurrentFile) 
	{
		// Find the last backslash.  (NOTE: if the sample is modified 
		// to use URLs, search for the last forward slash as well.)
		szFilename = _tcsrchr(szFile, BACKSLASH);
		if (NULL == szFilename)
		{
			szFilename = szFile;
		} 
		else
		{
			szFilename = szFilename + 1;
		}
		// Calculate the length of the directory path portion of the full file name.
		iPathLength = szFilename - szFile;
		// Calculate the file name length (including the terminating NULL).
		iFilenameLength = _tcslen(szFile) - iPathLength + 1;
		if (MAX_MARKLENGTH < iFilenameLength)
		{
			iFilenameLength = MAX_MARKLENGTH - 1;
			szFilename[iFilenameLength] = TEXT('\0');
		}
		_tcsncpy(m_szCurrentFile, szFilename, iFilenameLength);
	}

	return TRUE;
}

// Bookmark: Stores the current file name and position and 
//			 returns a formatted string for the bookmark list.

BOOL CMediaBookmarker::Bookmark(TCHAR *szBookmarkText)
{
	int seconds;
	int minutes;
	int hours;
	WCHAR *szFileName = new WCHAR[MAX_MARKLENGTH];  // Temporary storage for the file name

	// Confirm that the allocation succeeded.
	if (NULL == szFileName)
	{
		return FALSE;
	}

	// Retrieve the current file name and make sure it isn't empty.
	if (FAILED( m_spWMPPlayer->get_FileName(&szFileName) ) || !szFileName[0]) 
	{
		delete[] szFileName;
		szFileName = NULL;
		return FALSE;
	}

	// Make sure the current slot in the file name array is empty before filling it.
	if (NULL != m_bstrFileName[m_cMarkCount])
	{
		SysFreeString(m_bstrFileName[m_cMarkCount]);
		m_bstrFileName[m_cMarkCount] = NULL;
	}
	
	// Store the file name in the file name array for future use.
	m_bstrFileName[m_cMarkCount] = SysAllocString(szFileName);

	delete[] szFileName;
	szFileName = NULL;
	
	// Retrieve the current position, and store it in the position array for future use.
	if (FAILED(	m_spWMPPlayer->get_CurrentPosition(&m_dMarkPosition[m_cMarkCount]) ))
	{
		return FALSE;
	}

	// Convert the current position (in seconds) to hours, minutes, and seconds for display.
	seconds = (int)m_dMarkPosition[m_cMarkCount];
	hours = seconds/60/60;
	minutes = (seconds/60) % 60;
	seconds = seconds % 60;

	// If the current position is an hour or more from the beginning, include an hours display.
	if (hours) 
	{
		_sntprintf(szBookmarkText, MAX_MARKLENGTH, L"%02d:%02d:%02d - %s", 
			hours, minutes, seconds, m_szCurrentFile);
	}
	// If the current position is less than an hour from the beginning, exclude the hours display.
	else
	{
		_sntprintf(szBookmarkText, MAX_MARKLENGTH, L"%02d:%02d - %s", 
			minutes, seconds, m_szCurrentFile);
	}

	return TRUE;
}

// Invoke: redirects Windows Media Player control events to the appropriate event handler.

HRESULT CMediaBookmarker::Invoke(	DISPID				dispIdMember,	  
									REFIID				riid,			  
									LCID				lcid,				
									WORD				wFlags,			  
									DISPPARAMS FAR		*pDispParams,  
									VARIANT FAR			*pVarResult,  
									EXCEPINFO FAR		*pExcepInfo,  
									unsigned int FAR	*puArgErr )
{
	if (!pDispParams)
	{
		return E_POINTER;
	}

	if (pDispParams->cNamedArgs != 0)
	{
		return DISP_E_NONAMEDARGS;
	}

	HRESULT hr = S_OK;

	switch (dispIdMember)
	{
		case IWMPEVENTS_DISPID_PLAYSTATECHANGE: OnPlayStateChange(pDispParams->rgvarg[0].lVal);
			break;
		default:
			hr = DISP_E_MEMBERNOTFOUND;
	}

	return( hr );
}

//  OnPlayStateChange: Called when the control changes PlayState.

void CMediaBookmarker::OnPlayStateChange(long NewState)
{
	if (0 == NewState) // stopped
	{
		// Hide the video window and resize the bookmark list.
		::MoveWindow(GetDlgItem(IDL_BOOKMARKS),	0, 40, 240, 214, FALSE);
		::MoveWindow(GetDlgItem(IDC_PLAYER), 0, 254, 240, 14, FALSE);
	}
	else if (2 == NewState) // playing
	{
		// Retrieve the video height. If it is greater than zero, 
		// resize the video window and bookmark list.
		long lPlayerHeight = 0L;
		if (SUCCEEDED(m_spWMPPlayer->get_ImageSourceHeight(&lPlayerHeight)) && lPlayerHeight)
		{
			// Make sure the status bar stays visible.
			lPlayerHeight += STATUS_BAR_HEIGHT;

			// Make sure there is room for a few bookmark list entries.
			if (lPlayerHeight > MAX_PLAYER_HEIGHT) 
			{
				lPlayerHeight = MAX_PLAYER_HEIGHT;
			}

			::MoveWindow(GetDlgItem(IDL_BOOKMARKS),	0, 40, 240, 268 - (lPlayerHeight+40), FALSE);
			::MoveWindow(GetDlgItem(IDC_PLAYER), 0, 268 - lPlayerHeight, 240, lPlayerHeight, FALSE);
		}
	}
	return;
}