如何通过海康威视设备网络SDK进行Java二次开发摄像头车牌识别详解

private static boolean createSDKInstance() {
        if (hCNetSDK == null) {
            synchronized (HCNetSDK.class) {
                String strDllPath = "";
                try {
                    if (osSelect.isWindows())
                        //win系统加载库路径
                        strDllPath = System.getProperty("user.dir") + "\\lib\\HCNetSDK.dll";
                    else if (osSelect.isLinux())
                        //Linux系统加载库路径
                        strDllPath = System.getProperty("user.dir") + "/lib/libhcnetsdk.so";
                    hCNetSDK = (HCNetSDK) Native.loadLibrary(strDllPath, HCNetSDK.class);
                    System.out.println(strDllPath);
                } catch (Exception ex) {
                    System.out.println("loadLibrary: " + strDllPath + " Error: " + ex.getMessage());
                    return false;
                }
            }
        }
        return true;
    }

if (hcNetSDK == null) {
            synchronized (HCNetSDK.class) {
                String strDllPath = "";
                try {
                
                    // 加载库
                    hcNetSDK = (HCNetSDK) Native.loadLibrary("HCNetSDK", HCNetSDK.class);
                } catch (Exception ex) {
                    logger.info("loadLibrary: " + strDllPath + " Error: " + ex.getMessage());
                    return false;
                }
            }

public class BaseStructure extends Structure
{
	@Override
	protected List<String> getFieldOrder()
	{
		return getFiledName(this);
	}

	public static List<String> getFiledName(Object o)
	{
		Field[] fields = o.getClass().getDeclaredFields();
		String[] fieldNames = new String[fields.length];
		for (int i = 0; i < fields.length; i++)
		{
			fieldNames[i] = fields[i].getName();
		}
		return Arrays.asList(fieldNames);
	}
}

if (hCNetSDK == null) {
            if (!createSDKInstance()) {
                System.out.println("Load SDK fail");
                return;
            }
        }

        /**初始化*/
        hCNetSDK.NET_DVR_Init();
        /**加载日志*/
        hCNetSDK.NET_DVR_SetLogToFile(3, "./sdklog1", false);
        

public class FMSGCallBack implements HCNetSDK.FMSGCallBack_V31 {
    //报警信息回调函数
    public boolean invoke(int lCommand, HCNetSDK.NET_DVR_ALARMER pAlarmer, Pointer pAlarmInfo, int dwBufLen, Pointer pUser) {

        LOGGER.info("报警事件类型： lCommand:" + Integer.toHexString(lCommand));
        String MonitoringSiteID;
        switch (lCommand) {
            case 0x3058:
                LOGGER.info("报警事件类型： 0x3058 车辆黑白名单数据需要同步报警上传");
                break;

            case HCNetSDK.COMM_UPLOAD_PLATE_RESULT:
                LOGGER.info("报警事件类型： COMM_UPLOAD_PLATE_RESULT");
                break;

            case HCNetSDK.COMM_ITS_PLATE_RESULT:  // 交通抓拍结果(新报警信息)
                HCNetSDK.NET_ITS_PLATE_RESULT strItsPlateResult = new HCNetSDK.NET_ITS_PLATE_RESULT();
                //可以在这里处理自己的逻辑
                break;

            default:
                LOGGER.info("报警类型：" + Integer.toHexString(lCommand));
                break;
        }
        return true;
    }

}

if (fMSFCallBack_V31 == null) {
            fMSFCallBack_V31 = new FMSGCallBack_V31();
            Pointer pUser = null;
            if (!hCNetSDK.NET_DVR_SetDVRMessageCallBack_V31(fMSFCallBack_V31, pUser)) {
                System.out.println("设置回调函数失败!");
                return;
            } else {
                System.out.println("设置回调函数成功!");
            }
        }

/** 设备上传的报警信息是COMM_VCA_ALARM(0x4993)类型，
         在SDK初始化之后增加调用NET_DVR_SetSDKLocalCfg(enumType为NET_DVR_LOCAL_CFG_TYPE_GENERAL)设置通用参数NET_DVR_LOCAL_GENERAL_CFG的byAlarmJsonPictureSeparate为1，
         将Json数据和图片数据分离上传，这样设置之后，报警布防回调函数里面接收到的报警信息类型为COMM_ISAPI_ALARM(0x6009)，
         报警信息结构体为NET_DVR_ALARM_ISAPI_INFO（与设备无关，SDK封装的数据结构），更便于解析。*/

        HCNetSDK.NET_DVR_LOCAL_GENERAL_CFG struNET_DVR_LOCAL_GENERAL_CFG = new HCNetSDK.NET_DVR_LOCAL_GENERAL_CFG();
        struNET_DVR_LOCAL_GENERAL_CFG.byAlarmJsonPictureSeparate = 1;   //设置JSON透传报警数据和图片分离
        struNET_DVR_LOCAL_GENERAL_CFG.write();
        Pointer pStrNET_DVR_LOCAL_GENERAL_CFG = struNET_DVR_LOCAL_GENERAL_CFG.getPointer();
        hCNetSDK.NET_DVR_SetSDKLocalCfg(17, pStrNET_DVR_LOCAL_GENERAL_CFG);

lUserID=Alarm.loginDevice( "10.9.137.17", (short) 8000, "admin", "hik12345");  //登录设备

lAlarmHandle=Alarm.setAlarmChan(lUserID);//报警布防，和报警监听二选一即可