3.8.7 获取设备支持的云台协议 NET_DVR_GetPTZProtocol ....................................................... 37
3.9 录像文件回放、下载、锁定及备份 .......................................................................................... 37
刷新录像索引 .................................................................................................................................. 37
3.9.1 即时刷新录像索引 NET_DVR_UpdateRecordIndex ............................................................ 37
录像文件的查找 .............................................................................................................................. 37
3.9.2 根据文件类型、时间查找设备录像文件 NET_DVR_FindFile_V30 .................................... 37
3.9.3 逐个获取查找到的文件信息 NET_DVR_FindNextFile_V30................................................ 38
3.9.4 关闭文件查找，释放资源 NET_DVR_FindClose_V30 ....................................................... 38
按事件查找录像 .............................................................................................................................. 39
3.9.5 按事件查找录像 NET_DVR_FindFileByEvent ..................................................................... 39
3.9.6 逐个获取查找到的文件信息 NET_DVR_FindNextEvent .................................................... 39
3.9.7 关闭文件查找，释放资源 NET_DVR_FindClose_V30 ....................................................... 40
回放录像文件 .................................................................................................................................. 40
3.9.8 注册回调函数，捕获录像数据 NET_DVR_SetPlayDataCallBack ........................................ 40
3.9.9 按文件名回放录像文件 NET_DVR_PlayBackByName ....................................................... 40
3.9.10 按时间回放录像文件 NET_DVR_PlayBackByTime ............................................................ 41
3.9.11 按时间回放录像文件 NET_DVR_PlayBackByTime_V40 .................................................... 41
3.9.12 控制录像回放的状态 NET_DVR_PlayBackControl_V40..................................................... 42
3.9.13 获取回放取流进度 NET_DVR_GetPlayBackPos.................................................................. 42
3.9.14 停止回放录像文件 NET_DVR_StopPlayBack..................................................................... 43
3.9.15 获取回放时用来解码显示的播放库句柄 NET_DVR_GetPlayBackPlayerIndex ................... 43
3.9.16 录像回放时抓图 NET_DVR_PlayBackCaptureFile .............................................................. 43
3.9.17 按文件名倒放录像文件 NET_DVR_PlayBackReverseByName ............................................ 43
3.9.18 按时间倒放录像文件 NET_DVR_PlayBackReverseByTime_V40 ......................................... 44
下载录像文件 .................................................................................................................................. 44
3.9.19 按文件名下载录像文件 NET_DVR_GetFileByName ......................................................... 44
3.9.20 按时间下载录像文件 NET_DVR_GetFileByTime............................................................... 44
3.9.21 控制录像下载的状态 NET_DVR_PlayBackControl_V40...................................................... 45
3.9.22 获取当前下载录像文件的进度 NET_DVR_GetDownloadPos ............................................. 45
3.9.23 停止下载录像文件 NET_DVR_StopGetFile ....................................................................... 46
3.10 云台控制 .................................................................................................................................... 46
云台控制操作 .................................................................................................................................. 46
3.10.1 云台控制操作（需先启动预览）NET_DVR_PTZControl ................................................... 46
3.10.2 云台控制操作（不用启动预览）NET_DVR_PTZControl_Other ......................................... 47
3.10.3 带速度的云台控制操作（需先启动预览）NET_DVR_PTZControlWithSpeed ................... 47
3.10.4 带速度的云台控制操作（不用启动预览）NET_DVR_PTZControlWithSpeed_Other ......... 48
云台预置点操作 .............................................................................................................................. 48
3.10.5 云台预置点操作，需先启动预览 NET_DVR_PTZPreset .................................................... 48
3.10.6 云台预置点操作 NET_DVR_PTZPreset_Other.................................................................... 49
云台巡航操作 .................................................................................................................................. 49
3.10.7 云台巡航操作，需先启动预览 NET_DVR_PTZPCruise ...................................................... 49
3.10.8 云台巡航操作 NET_DVR_PTZPCruise_Other...................................................................... 50
云台轨迹操作 .................................................................................................................................. 50
3.10.9 云台轨迹操作，需先启动预览 NET_DVR_PTZTrack.......................................................... 50
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