打印一张图片或上传的图片，可先预览图片 打印一张图片或上传的图片，可先预览图片-print a image, and you can prepareView the image

网络硬盘录像机SDK，包括监控录像的记录与回放，报警点设置，多频道多画面设置-Network DVR SDK, including the recording and playback of video surveillance, alarm point setting, multi-channel multi-screen settings