Solutions to common problems in secondary development of Java Hikvision SDK

Solutions to common problems in secondary development of Java Hikvision SDK

1. Introduction
With the development of Internet of Things technology, video surveillance systems have become An important means of security in modern society. In the development process of video surveillance systems, Hikvision SDK is often widely used. However, during use, we often encounter some common problems. This article will introduce you step by step and provide solutions.

2. Question 1: SDK import problem
In secondary development, the first problem is how to correctly import Hikvision SDK. The following are some common import problems and their solutions:

1. The project reports errors after importing the SDK
   Problem description: After importing the SDK, various errors occur in the project, such as classes and methods cannot be found Call errors etc.
   Solution: First check the compatibility of the SDK and confirm whether the SDK version matches the development environment. Secondly, check whether the imported JAR package is complete and whether there are any dependent third-party libraries missing. Finally, check whether the project's build path is configured correctly and contains the correct JAR package.
2. SDK compilation problem
   Problem description: When compiling the code, problems such as the inability to parse the class and the inability to recognize the method occur.
   Solution: Check whether the environment variables are configured correctly, especially the JAVA_HOME and Path variables. Make sure JAVA_HOME points to the correct JDK path and add the JDK's bin directory to the Path variable.

Sample code:

public class HikvisionSDKTest {
    public static void main(String[] args) {
        System.out.println("Hello Hikvision SDK!");
    }
}

3. Question 2: SDK initialization problem
When using Hikvision SDK to develop video surveillance systems, initialization of the SDK is essential step. The following are some common initialization problems and their solutions:

1. SDK initialization failed
   Problem description: When calling the SDK initialization method, an initialization failure error message appears.
   Solution: Check whether the initialization parameters of the SDK are set correctly, including device IP address, user name, password, etc. Make sure the device's network connection is normal and the device's username and password are correct. In addition, detailed analysis of the error information needs to be carried out based on the error codes provided by the SDK in order to better locate and solve the problem.

Sample code:

public class HikvisionSDKTest {
    public static void main(String[] args) {
        HCNetSDK.NET_DVR_Init();
        if (HCNetSDK.NET_DVR_GetLastError() != HCNetSDK.NET_DVR_NOERROR) {
            System.out.println("SDK初始化失败：" + HCNetSDK.NET_DVR_GetLastError());
            return;
        }
        // SDK初始化成功后的其他操作...
    }
}

2. Failed to log in to the device
   Problem description: When calling the method of logging in to the device, the device cannot be logged in successfully.
   Solution: Check whether the network connection of the device is normal. Confirm whether the device IP address, user name, and password are correct. In addition, detailed analysis of the error information needs to be carried out based on the error codes provided by the SDK in order to better locate and solve the problem.

Sample code:

public class HikvisionSDKTest {
    public static void main(String[] args) {
        HCNetSDK.NET_DVR_Init();
        // SDK其他初始化操作...
        
        HCNetSDK.NET_DVR_USER_LOGIN_INFO loginInfo = new HCNetSDK.NET_DVR_USER_LOGIN_INFO();
        // 设置登录设备的参数...
        HCNetSDK.NET_DVR_DEVICEINFO_V40 deviceInfo = new HCNetSDK.NET_DVR_DEVICEINFO_V40();
        
        NativeLong userID = HCNetSDK.NET_DVR_Login_V40(loginInfo, deviceInfo);
        if (userID.intValue() == -1) {
            System.out.println("登录设备失败：" + HCNetSDK.NET_DVR_GetLastError());
            return;
        }
        // 登录设备成功后的其他操作...
    }
}

IV. Question 3: SDK operation issues
When using Hikvision SDK to develop video surveillance systems, we will also encounter some SDK operations related questions. The following are some common problems and their solutions:

1. Multi-threaded operation SDK problems
   Problem description: When operating the SDK concurrently in a multi-threaded environment, problems such as data confusion and crashes may occur.
   Solution: Try to avoid operating the SDK in multiple threads at the same time. Please use mutex locks and other methods to ensure the thread safety of concurrent operations.

Sample code:

public class HikvisionSDKTest {
    public static void main(String[] args) {
        // 线程1，用于调用SDK方法
        Thread thread1 = new Thread(() -> {
            // SDK方法调用...
        });
        
        // 线程2，用于调用SDK方法
        Thread thread2 = new Thread(() -> {
            // SDK方法调用...
        });
        
        // 启动线程
        thread1.start();
        thread2.start();
        
        // 等待线程执行完成
        try {
            thread1.join();
            thread2.join();
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        
        // 处理其他业务逻辑...
    }
}

2. SDK memory leak problem
   Problem description: During the use of SDK, a memory leak occurs.
   Solution: During the use of the SDK, ensure that resources that are no longer used are released in a timely manner to avoid memory leaks. For some methods that require manual release of memory, such as shutting down the device, logging out, etc., don't forget to call the corresponding method to release resources.

Sample code:

public class HikvisionSDKTest {
    private static NativeLong userID; // 设备登录ID
    
    public static void main(String[] args) {
        // SDK初始化...
        // 设备登录...
        
        // 设备使用完成后，需要调用注销登录的方法释放资源
        HCNetSDK.NET_DVR_Logout(userID);
        
        // SDK使用完成后，需要调用释放SDK的方法
        HCNetSDK.NET_DVR_Cleanup();
    }
}

5. Summary
In the secondary development of Java Hikvision SDK, we often encounter some problems. This article provides corresponding solutions to common problems and attaches corresponding code examples. I hope this article can provide some help to you in the secondary development process of Hikvision SDK and help you locate and solve problems faster. If you have other related questions, please leave a message for discussion.

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