How to Obtain Hikvision Camera Handle in Delphi50

In the surveillance industry, Delphi is a popular programming language used to develop various applications, including video surveillance systems. Hikvision, a leading manufacturer of surveillance cameras, provides comprehensive APIs for camera integration, allowing developers to control and access camera functionality from within their applications.

Obtaining a camera handle is a crucial step in establishing a connection between the application and the camera. The camera handle serves as a unique identifier for the camera, enabling the application to perform operations such as live video streaming, PTZ control, and configuration changes.

In Delphi, the process of obtaining a camera handle involves several steps:
Initialize the Hikvision SDK: Before interacting with the cameras, the Hikvision SDK must be initialized by calling the CHCNetSDK.NET_DVR_Init function.
Login to the Camera: To establish a connection with the camera, the application must provide valid login credentials by calling the CHCNetSDK.NET_DVR_Login_V30 function. The input parameters include the IP address or domain name of the camera, port number, username, and password.
Get Camera Handle: After successfully logging into the camera, the application can obtain the camera handle by calling the CHCNetSDK.NET_DVR_GetDVRConfig function. The camera handle is stored in the NET_DVR_DEVICEINFO_V30 structure passed as an argument to the function.
Release Resources: When finished using the camera handle, it's important to release it by calling the CHCNetSDK.NET_DVR_Logout_V30 function. This ensures proper cleanup and resource management.

Here's an example code snippet demonstrating how to obtain a camera handle in Delphi:
// Initialize Hikvision SDK
CHCNetSDK.NET_DVR_Init();
// Login to the camera
var loginInfo: TNET_DVR_USER_LOGIN_INFO = ();
:= '192.168.1.100';
:= 8000;
:= 'admin';
:= 'password';
var loginHandle: Longint;
loginHandle := CHCNetSDK.NET_DVR_Login_V30(loginInfo, nil);
// Get camera handle
var deviceInfo: TNET_DVR_DEVICEINFO_V30 = ();
:= 1;
:= 1;
:= '';
var cameraHandle: Longint;
cameraHandle := CHCNetSDK.NET_DVR_GetDVRConfig(loginHandle, CHCNetSDK.NET_DVR_GET_DEVICECFG, deviceInfo, );
// Release resources
CHCNetSDK.NET_DVR_Logout_V30(loginHandle);

Once the camera handle is obtained, it can be used for various operations within the application, such as live video streaming, playback control, parameter configuration, and event handling.

It's important to note that proper camera handle management is crucial for maintaining a stable and efficient connection to the camera. Developers should ensure that camera handles are released promptly after use to avoid resource leaks and potential system instability.

2025-02-03

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