hxcbobj.cpp

著名的 helix realplayer 基于手机 symbian 系统的 播放器全套源代码

/* ***** BEGIN LICENSE BLOCK ***** 
 * Version: RCSL 1.0/RPSL 1.0 
 *  
 * Portions Copyright (c) 1995-2002 RealNetworks, Inc. All Rights Reserved. 
 *      
 * The contents of this file, and the files included with this file, are 
 * subject to the current version of the RealNetworks Public Source License 
 * Version 1.0 (the "RPSL") available at 
 * http://www.helixcommunity.org/content/rpsl unless you have licensed 
 * the file under the RealNetworks Community Source License Version 1.0 
 * (the "RCSL") available at http://www.helixcommunity.org/content/rcsl, 
 * in which case the RCSL will apply. You may also obtain the license terms 
 * directly from RealNetworks.  You may not use this file except in 
 * compliance with the RPSL or, if you have a valid RCSL with RealNetworks 
 * applicable to this file, the RCSL.  Please see the applicable RPSL or 
 * RCSL for the rights, obligations and limitations governing use of the 
 * contents of the file.  
 *  
 * This file is part of the Helix DNA Technology. RealNetworks is the 
 * developer of the Original Code and owns the copyrights in the portions 
 * it created. 
 *  
 * This file, and the files included with this file, is distributed and made 
 * available on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER 
 * EXPRESS OR IMPLIED, AND REALNETWORKS HEREBY DISCLAIMS ALL SUCH WARRANTIES, 
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, FITNESS 
 * FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. 
 * 
 * Technology Compatibility Kit Test Suite(s) Location: 
 *    http://www.helixcommunity.org/content/tck 
 * 
 * Contributor(s): 
 *  
 * ***** END LICENSE BLOCK ***** */ 

#include "hxtypes.h"
#include "hxcom.h"
#include "hxcbobj.h"
#include "hxassert.h"

CHXGenericCallback::CHXGenericCallback(void* pParam, fGenericCBFunc pFunc)
 :  m_lRefCount(0)
 ,  m_fpCB(pFunc)
 ,  m_pParam(pParam)
 ,  m_PendingHandle(0)
{
}

CHXGenericCallback::~CHXGenericCallback()
{
}

STDMETHODIMP CHXGenericCallback::QueryInterface(REFIID riid, void** ppvObj)
{
    QInterfaceList qiList[] =
    {
        { GET_IIDHANDLE(IID_IHXCallback), (IHXCallback*)this },
        { GET_IIDHANDLE(IID_IUnknown), (IUnknown*)(IHXCallback*)this },
    };
    
    return ::QIFind(qiList, QILISTSIZE(qiList), riid, ppvObj);
}

STDMETHODIMP_(ULONG32) CHXGenericCallback::AddRef()
{
    return InterlockedIncrement(&m_lRefCount);
}

STDMETHODIMP_(ULONG32) CHXGenericCallback::Release()
{
    if (InterlockedDecrement(&m_lRefCount) > 0)
    {
	return m_lRefCount;
    }

    delete this;
    return 0;
}


STDMETHODIMP CHXGenericCallback::Func(void)
{
    HX_ASSERT(m_fpCB && m_pParam && m_PendingHandle);

    m_PendingHandle = 0;

    if (m_fpCB)
    {
	(*m_fpCB)(m_pParam);
    }

    return HXR_OK;
}

void CHXGenericCallback::ScheduleRelative(IHXScheduler* pScheduler, UINT32 ulMs)
{
    if (pScheduler && !IsCallbackPending())
    {
        // No callback currently scheduled, so schedule one
        CallbackHandle hCB = pScheduler->RelativeEnter(this, ulMs);
        CallbackScheduled(hCB);
    }
}

void CHXGenericCallback::Cancel(IHXScheduler* pScheduler)
{
    if (pScheduler && IsCallbackPending())
    {
        pScheduler->Remove(GetPendingCallback());
        CallbackCanceled();
    }
}