海康SDK报警订阅java代码

以下是使用海康SDK进行报警订阅的Java代码示例，仅供参考：

import com.sun.jna.NativeLong;
import com.sun.jna.Pointer;
import com.sun.jna.ptr.ByteByReference;
import com.sun.jna.ptr.NativeLongByReference;
import com.sun.jna.ptr.PointerByReference;
import com.sun.jna.win32.StdCallLibrary;

public interface HCNetSDK extends StdCallLibrary {

    // SDK初始化和反初始化
    public static native boolean NET_DVR_Init();
    public static native boolean NET_DVR_Cleanup();

    // 用户注册和注销
    public static native NativeLong NET_DVR_Login_V30(String sDVRIP, short wDVRPort, String sUserName, String sPassword, NET_DVR_DEVICEINFO_V30 lpDeviceInfo);
    public static native boolean NET_DVR_Logout(NativeLong lUserID);

    // 报警布防和撤防
    public static native NativeLong NET_DVR_SetupAlarmChan_V30(NativeLong lUserID, NET_DVR_ALARMER pAlarmer, Pointer fAlarmDataCallBack, Pointer pUser);
    public static native boolean NET_DVR_CloseAlarmChan_V30(NativeLong lAlarmHandle);
}

// 报警回调函数
public class AlarmCallBack implements HCNetSDK.FMSGCallBack_V31 {
    public void invoke(NativeLong lCommand, HCNetSDK.NET_DVR_ALARMER pAlarmer, HCNetSDK.RECV_ALARM pAlarmInfo, int dwBufLen, Pointer pUser) {
        switch (lCommand.intValue()) {
            case HCNetSDK.COMM_ALARM_V30: // 报警信息
                System.out.println("Receive alarm message, type: COMM_ALARM_V30");
                break;
            case HCNetSDK.COMM_ALARM_RULE: // 行为分析报警信息
                System.out.println("Receive alarm message, type: COMM_ALARM_RULE");
                break;
            case HCNetSDK.COMM_UPLOAD_PLATE_RESULT: // 车牌识别结果上传
                System.out.println("Receive alarm message, type: COMM_UPLOAD_PLATE_RESULT");
                break;
            default:
                System.out.println("Receive alarm message, type: other");
                break;
        }
    }
}

public class Main {
    public static void main(String[] args) {
        // 初始化SDK
        boolean initResult = HCNetSDK.NET_DVR_Init();
        if (!initResult) {
            System.out.println("Failed to initialize SDK");
            return;
        }

        // 注册设备
        String deviceIP = "192.168.1.100"; // 设备IP地址
        short devicePort = 8000; // 设备端口号
        String username = "admin"; // 设备用户名
        String password = "12345"; // 设备密码
        HCNetSDK.NET_DVR_DEVICEINFO_V30 deviceInfo = new HCNetSDK.NET_DVR_DEVICEINFO_V30();
        NativeLong userId = HCNetSDK.NET_DVR_Login_V30(deviceIP, devicePort, username, password, deviceInfo);
        if (userId.intValue() < 0) {
            System.out.println("Failed to login device, error code: " + HCNetSDK.NET_DVR_GetLastError());
            HCNetSDK.NET_DVR_Cleanup(); // 反初始化SDK
            return;
        }

        // 设置报警回调函数
        HCNetSDK.FMSGCallBack_V31 alarmCallback = new AlarmCallBack();
        Pointer alarmCallbackPointer = alarmCallback.getPointer();
        NativeLong alarmHandle = HCNetSDK.NET_DVR_SetupAlarmChan_V30(userId, null, alarmCallbackPointer, null);
        if (alarmHandle.intValue() < 0) {
            System.out.println("Failed to setup alarm channel, error code: " + HCNetSDK.NET_DVR_GetLastError());
            HCNetSDK.NET_DVR_Logout(userId); // 注销设备
            HCNetSDK.NET_DVR_Cleanup(); // 反初始化SDK
            return;
        }

        // 等待报警信息
        System.out.println("Waiting for alarm message...");
        Scanner scanner = new Scanner(System.in);
        scanner.nextLine();

        // 关闭报警通道
        boolean closeResult = HCNetSDK.NET_DVR_CloseAlarmChan_V30(alarmHandle);
        if (!closeResult) {
            System.out.println("Failed to close alarm channel, error code: " + HCNetSDK.NET_DVR_GetLastError());
        }

        // 注销设备
        boolean logoutResult = HCNetSDK.NET_DVR_Logout(userId);
        if (!logoutResult) {
            System.out.println("Failed to logout device, error code: " + HCNetSDK.NET_DVR_GetLastError());
        }

        // 反初始化SDK
        boolean cleanupResult = HCNetSDK.NET_DVR_Cleanup();
        if (!cleanupResult) {
            System.out.println("Failed to cleanup SDK");
        }
    }
}

在代码中，我们首先使用`NET_DVR_Init`函数初始化海康SDK，然后使用`NET_DVR_Login_V30`函数注册设备，并获取设备的用户ID。接着，我们使用`NET_DVR_SetupAlarmChan_V30`函数设置报警回调函数，并等待报警信息。当接收到报警信息时，报警回调函数会被调用，并进行相应的处理。最后，我们使用`NET_DVR_CloseAlarmChan_V30`函数关闭报警通道，并使用`NET_DVR_Logout`函数注销设备，最后使用`NET_DVR_Cleanup`函数反初始化SDK。