Methods and techniques for secondary development of Java Hikvision SDK to give full play to its functions

Methods and techniques for secondary development of Java Hikvision SDK to give full play to its functions

1. Introduction

With the continuous advancement of technology, video surveillance Technology is widely used in various fields. As the world's leading provider of video surveillance solutions, Hikvision's SDK (Software Development Kit) provides developers with rich interfaces that can realize various complex functional requirements. This article will share some methods and techniques for secondary development of Java Hikvision SDK to help developers better utilize the functions of the SDK.

2. Preparation work

Before starting the secondary development, we need to download and install the Java Hikvision SDK and complete the construction of the development environment. Here are some basic steps:

1. Download Java Hikvision SDK: Download the latest version of Java SDK from the official Hikvision website and extract it to a local directory.
2. Import dependent libraries: In the project's build path, introduce the dependent library files provided by Java Hikvision SDK.
3. Configure environment variables: Add the bin directory of Java Hikvision SDK to the system's Path environment variable, so that we can directly call the tools provided by the SDK in the command line.

3. Basic function development

1. Initialize SDK

The first step in using Java Hikvision SDK is to initialize the SDK. The code example is as follows ：

HCNetSDK.NET_DVR_Init();
System.out.println("SDK初始化成功！");

2. Log in to the device

After successfully initializing the SDK, we need to use the administrator account to log in to the device. The code example is as follows:

HCNetSDK.NET_DVR_DEVICEINFO deviceInfo = new HCNetSDK.NET_DVR_DEVICEINFO();
int userID = HCNetSDK.NET_DVR_Login_V30("设备 IP", 端口, "用户名", "密码", deviceInfo);
if (userID == -1) {
    System.out.println("登录设备失败！");
} else {
    System.out.println("登录设备成功！");
}

3. Real-time video preview

After successfully logging in to the device, we can preview the device's video in real time in the Java application by calling the interface provided by the SDK. Code examples are as follows:

HCNetSDK.NET_DVR_PREVIEWINFO previewInfo = new HCNetSDK.NET_DVR_PREVIEWINFO();
previewInfo.lChannel = 1; // 预览的通道号
previewInfo.hPlayWnd = null; // 预览窗口句柄，传入null表示SDK自动创建窗口

int previewHandle = HCNetSDK.NET_DVR_RealPlay_V40(userID, previewInfo, null);
if (previewHandle == -1) {
    System.out.println("预览视频失败！");
} else {
    System.out.println("预览视频成功！");

    // 在预览过程中，我们可以通过调用SDK提供的其他接口实现功能如停止预览、抓拍、录像等。
}

4. Advanced function development

In addition to basic function development, Java Hikvision SDK also provides some advanced functional interfaces, such as face recognition, license plate recognition, etc. . The following is a sample code to implement the face recognition function:

// 初始化人脸识别库
HCNetSDK.NET_DVR_FACELIB_COND faceLibCond = new HCNetSDK.NET_DVR_FACELIB_COND();
faceLibCond.byConcurrent = 0;
faceLibCond.dwSize = faceLibCond.size();
int faceLibHandle = HCNetSDK.NET_DVR_CreateFaceLib_V40(userID, faceLibCond);
if (faceLibHandle == -1) {
    System.out.println("初始化人脸识别库失败！");
} else {
    System.out.println("初始化人脸识别库成功！");

    // 在人脸识别过程中，我们可以调用SDK提供的接口来进行人脸注册、删除、搜索等操作。
}

5. Exception handling

In secondary development, we need to fully consider various abnormal situations. Java Hikvision SDK provides an error code table, which can be viewed in the ErrorMessage directory under the SDK installation directory. We can determine whether the operation is successful by judging the return value, and analyze the specific error cause based on the error code table.

int errorCode = HCNetSDK.NET_DVR_GetLastError();
System.out.println("操作失败，错误码为：" + errorCode);

6. Summary

This article introduces the methods and techniques of secondary development of Java Hikvision SDK, including the development of basic functions and the development of advanced functions. By learning and applying these methods and techniques, developers can better utilize the functions of Java Hikvision SDK and realize various complex monitoring requirements. Of course, in addition to the functions introduced in this article, Java Hikvision SDK has many other interfaces and functions, and developers can conduct more in-depth study and research according to their actual needs.

I hope this article can be helpful to the secondary development of Java Hikvision SDK, and inspire readers’ innovative thinking and practice in the field of video surveillance. Let us work together to promote the development of video surveillance technology and make greater contributions to the safety and stability of society!

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