m_PictureBox = p_PictureBox;
            m_PictureHandle = p_PictureBox.Handle;
            CHCNetSDK.NET_DVR_CLIENTINFO lpClientInfo = new CHCNetSDK.NET_DVR_CLIENTINFO();
            lpClientInfo.hPlayWnd = IntPtr.Zero;
             lpClientInfo.lChannel = 1;
            lpClientInfo.lLinkMode = 0;
            lpClientInfo.sMultiCastIP = null;

            this.m_nBagCount = nBagCount;
            m_Reviewhandle = CHCNetSDK.NET_DVR_RealPlay_V30(m_UserID, ref lpClientInfo, m_RealData, IntPtr.Zero, 1);

            if (m_Reviewhandle == -1)
            {
                nBagCount = -1;
                uint _Error = CHCNetSDK.NET_DVR_GetLastError();
                if (_Error > 0)
                    YTLog.Error("预览视频失败！错误代码为：" + _Error.ToString() + ";错误信息：" + GetErrStr(_Error));
                return false;
            }


       //播放回调
        private void RealDataCallBack(Int32 lRealHandle, UInt32 dwDataType, ref byte pBuffer, UInt32 dwBufSize, IntPtr pUser)
        {
            switch (dwDataType)
            {
                case CHCNetSDK.NET_DVR_SYSHEAD:
                    if (m_lPort < 0)
                    {
                        if (!HKPlayCtrl.PlayM4_GetPort(ref m_lPort))
                        {
                            YTLog.Error("获取播放库端口失败！错误代码为：");
                        }
                    }
                    if (dwBufSize > 0)
                    {
                        if (!HKPlayCtrl.PlayM4_SetStreamOpenMode(m_lPort, HKPlayCtrl.STREAME_REALTIME))
                        {
                            break;
                        }

                        if (!HKPlayCtrl.PlayM4_OpenStream(m_lPort, ref pBuffer, dwBufSize, 1024 * 1024))
                        {
                            break;
                        }

                        if (!HKPlayCtrl.PlayM4_SetDisplayBuf(m_lPort, 100))
                        {
                            break;
                        }

                        //解码回调
                        if (!HKPlayCtrl.PlayM4_SetDecCallBackEx(m_lPort, m_DECCBFUN, IntPtr.Zero, 0))
                        {
                            break;
                        }

                        //画图回调
                        if (!HKPlayCtrl.PlayM4_RegisterDrawFun(m_lPort, m_Play_DrawFun, 0))
                        {
                            break;
                        }

                        if (!HKPlayCtrl.PlayM4_Play(m_lPort, m_PictureHandle))
                        {
                            break;
                        }

                        if (!HKPlayCtrl.PlayM4_SetOverlayMode(m_lPort, 0, 0/* COLORREF(0)*/))//play off screen // todo!!!
                        {
                            break;
                        }

                    }
                    break;
                case CHCNetSDK.NET_DVR_STREAMDATA:     // video stream data
                    if (dwBufSize > 0 && m_lPort != -1)
                    {
                        for (int i = 0; i < 10; ++i)
                        {
                            if (HKPlayCtrl.PlayM4_InputData(m_lPort, ref pBuffer, dwBufSize))
                            {
                                break;
                            }
                            Thread.Sleep(5);
                        }
                        //while (HKPlayCtrl.PlayM4_InputData(m_lPort, ref pBuffer, dwBufSize) == false)
                        //{
                        //    Thread.Sleep(5);
                        //}
                    }
                    break;
                default:
                    break;
            }