Best practices for implementing secondary development functions of Java Hikvision SDK

The best practice for realizing the secondary development function of Java Hikvision SDK

Introduction:
With the development of Internet of Things technology, the application of video surveillance systems is becoming more and more popular The more extensive. Hikvision is the world's leading provider of security products and solutions. Its Hikvision SDK provides a wealth of functions and interfaces to facilitate developers for secondary development. This article will introduce how to use Java language to implement the secondary development function of Hikvision SDK and provide corresponding code examples.

1. Environment preparation
Before we start, we need to prepare the following environment:

1. JDK 1.8 and above
2. Eclipse or IntelliJ IDEA and other Java development Environment
3. Haikang SDK jar package

2. Create a Java project

1. Open a development environment such as Eclipse or IntelliJ IDEA
2. Create a new Java project and name it "HikvisionSDKDemo"
3. Import the jar package of Hikvision SDK into the classpath of the project

3. SDK initialization
When using Hikvision Before SDK, we need to do initial setup. The following is a simple initialization example:

import com.hikvision.netsdk.*;

public class HikvisionSDKDemo {

    public static void main(String[] args) {
        // SDK初始化
        boolean initSDK = Hikvision.NET_DVR_Init();
        
        if (initSDK) {
            System.out.println("SDK初始化成功！");
        } else {
            System.out.println("SDK初始化失败！");
            return;
        }

        // 其他初始化操作...
        
        // SDK反初始化
        Hikvision.NET_DVR_Cleanup();
    }
}

In this example, we use the static method NET_DVR_Init() provided by the com.hikvision.netsdk package for SDK initialization , we can perform other operations after the initialization is successful. Note that the NET_DVR_Cleanup() method must be used in the end to deinitialize the SDK.

4. Device search and login
In actual development, we usually need to search and log in to the device. The following is a code example for device search and login:

import com.hikvision.netsdk.*;

public class HikvisionSDKDemo {

    public static void main(String[] args) {
        // SDK初始化...

        // 设备搜索
        NET_DVR_DEVICEINFO_V30 deviceInfo = new NET_DVR_DEVICEINFO_V30();
        int deviceHandle = Hikvision.NET_DVR_FindDVR("", deviceInfo);

        if (deviceHandle >= 0) {
            System.out.println("设备搜索成功！");
        } else {
            System.out.println("设备搜索失败！");
            return;
        }
        
        // 设备登录
        int userID = Hikvision.NET_DVR_Login_V30(deviceInfo.sDVRIP, deviceInfo.wDVRPort, deviceInfo.sUserName, deviceInfo.sPassword, deviceInfo.byChanNum);

        if (userID >= 0) {
            System.out.println("设备登录成功！");
        } else {
            System.out.println("设备登录失败！");
        }

        // 其他操作...

        // 设备注销
        Hikvision.NET_DVR_Logout(userID);

        // 设备搜索与登录后的操作...
        
        // SDK反初始化...
    }
}

In this example, the NET_DVR_FindDVR() method is used to search for the device, and after obtaining the device’s IP, port, username, password and other information, Use the NET_DVR_Login_V30() method to log in to the device. After successful login, we can perform other operations; finally, use the NET_DVR_Logout() method to log out the device.

5. Video preview
After successfully logging in to the device, we can preview the video. The following is a code example for video preview:

import com.hikvision.netsdk.*;

public class HikvisionSDKDemo {

    public static void main(String[] args) {
        // SDK初始化...

        // 设备搜索与登录...

        // 创建预览句柄
        NET_DVR_PREVIEWINFO previewInfo = new NET_DVR_PREVIEWINFO();
        previewInfo.lChannel = 1; // 通道号
        previewInfo.dwStreamType = 0; // 码流类型，0为主码流，1为子码流
        previewInfo.dwLinkMode = 0x80000000; // TCP连接模式
        previewInfo.hPlayWnd = null; // 预览窗口句柄，传null表示不播放画面

        int previewHandle = Hikvision.NET_DVR_RealPlay_V40(userID, previewInfo, null, null);

        if (previewHandle >= 0) {
            System.out.println("视频预览成功！");
        } else {
            System.out.println("视频预览失败！");
        }

        // 其他操作...

        // 停止预览
        Hikvision.NET_DVR_StopRealPlay(previewHandle);

        // 设备注销...
        
        // SDK反初始化...
    }
}

In this example, we use the NET_DVR_RealPlay_V40() method to create a preview handle. The preview handle can be used to control the playback, stop, and other operations of the video. After the preview is successful, other operations can be performed; finally, use the NET_DVR_StopRealPlay() method to stop the preview.

6. Summary
This article introduces how to use Java language to realize the secondary development function of Hikvision SDK, and provides corresponding code examples. Through SDK initialization, device search and login, video preview and other examples, developers can further understand and use the functions and interfaces provided by Hikvision SDK to achieve a richer and more flexible video surveillance system.

It should be noted that in actual development, there are many other functions and interfaces that can be used for secondary development. This article only introduces some common functions. Developers can adjust and expand according to needs in actual projects to further enrich and optimize the system's functions.

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