private void DownloadByName()
        {
            if (m_DownLoadFileHandle > 0)
            {
                timerDownload.Stop();
                XMSDK.H264_DVR_StopGetFile(m_DownLoadFileHandle);
                m_DownLoadFileHandle         = 0;
                progressBarDownloadPos.Value = 0;

                btnDownload.Text = "Download";

                return;
            }

            string csFileName;

            //inCount;
            //if ( nSelected < 0 )
            //{
            //    MessageBox.Show("SelectFile !");
            //    return;
            //}


            H264_DVR_FILE_DATA FileInfo = (H264_DVR_FILE_DATA)listFile.FocusedItem.Tag;


            string strSaveName;
            //strSaveName.Format("c:\\record\\record.h264");
            int nSelectedIndex = comboDev.SelectedIndex;

            if (nSelectedIndex < 0)
            {
                MessageBox.Show("SelectDevice !");
                return;
            }
            DEV_INFO DevTemp = (DEV_INFO)((ComboxItem)comboDev.SelectedItem).Value;

            string strInitDir;

            strInitDir = Application.StartupPath;
            if (strInitDir.EndsWith("\\"))
            {
                strInitDir += "Download";
            }
            else
            {
                strInitDir += "\\Download";
            }

            DirectoryInfo dir = new DirectoryInfo(strInitDir);

            //if ( dir.Attributes )
            {
                dir.Create();
            }

            string strFileTpye = "h264";
            string strFileName = FileInfo.sFileName;

            if (strFileName.EndsWith(".h264"))
            {
                strFileTpye = "h264";
            }
            else
            {
                strFileTpye = "jpg";
            }
            strFileName = string.Format("{0}_{1}_{2}-{3}_{4}{5}{6}{7}.{8}",
                                        DevTemp.szDevName, FileInfo.ch + 1,
                                        FileInfo.stBeginTime.year, FileInfo.stBeginTime.month,
                                        FileInfo.stBeginTime.day, FileInfo.stBeginTime.hour,
                                        FileInfo.stBeginTime.minute, FileInfo.stBeginTime.second, strFileTpye);

            SaveFileDialog dlg = new SaveFileDialog();

            dlg.AddExtension     = true;
            dlg.CheckPathExists  = true;
            dlg.DefaultExt       = ".h264";
            dlg.Filter           = "All File(*.h264;*.jpg)|*.*||";
            dlg.InitialDirectory = strInitDir;          //默认路径

            dlg.FileName = strFileName;
            int count = listFile.SelectedItems[0].Index;

            if (dlg.ShowDialog() == DialogResult.OK)
            {
                strSaveName = dlg.FileName;
                //m_lSaveHandle = H264_DVR_GetFileByName(m_lLoginID, pstrFileInfo,strSaveName.GetBuffer(0),SDKDownLoadPosCallback,(DWORD)this);
                m_DownLoadFileHandle = XMSDK.H264_DVR_GetFileByName(m_lLoginID, ref FileInfo, strSaveName, null, 0, null);
                if (m_DownLoadFileHandle >= 0)
                {
                    progressBarDownloadPos.Value = 0;
                    btnDownload.Text             = "Stop";
                    //update the progress control
                    //SetTimer(1,0,NULL);
                }
                else
                {
                    string sTemp = string.Format("dowload fail ERROR = {0}", XMSDK.H264_DVR_GetLastError());
                    MessageBox.Show(sTemp);
                }
            }
        }