海康威视 java sdk 抓拍功能

public class TestHikvision {
 
    public static void main(String[] args) throws IOException {
        TestHikvision app = new TestHikvision();
        MonitorCameraInfo cameraInfo = new MonitorCameraInfo();//需要新建MonitorCameraInfo类
        cameraInfo.setCameraIp("192.168.1.66");
        cameraInfo.setCameraPort((short)8000);
        cameraInfo.setUserName("admin");
        cameraInfo.setUserPwd("xx111111");
        
        app.getDVRPic(cameraInfo);
    }
 
 
    //抓拍图片
    public void getDVRPic(MonitorCameraInfo cameraInfo) throws IOException {
        
        //设置通道号，其中1正常，-1不正常
        NativeL