Communicating with Human Interface Devices Communicator such as Alphanumeric display, Bar Code Reader, Sensors, Volume control on Speakers/Headsets becomes a primary use case for real-world applications. Do you spend more time in building libraries to communicate with HID for your Delphi/C++ and Lazarus Applications? WINSOFT Provides a powerful library to get the job done. It uses the standard Windows HID API.

Features:

• Able to notify on Human Interface Devices Communicator arrival and removal.
• Can retrieve all the HID devices information available in the System.
• Flexible to getting/set Feature Report for the HID devices.
• Works with Windows 32/64-bit applications.

Versions Supported: from C++ Builder 5 to 10.4 Sydney and Lazarus 2.0.8.

Platforms: Windows;  

Steps to Download and use the Native HID Library:

1. Download Native HID and Unzip the file.
2. Navigate to the Library folder for different Versions. e.g) Delphi10.4.
3. Read the Readme.txt file to know about features and copyright information.
4. Create a Windows VCL Application and use Hid.pas in the uses section.
5. Include the Library folder into Project->Options->Delphi Compiler->Search Path.
6. Compile and check for using the library.

Key HID concepts:
Report -Reports are the actual data that is exchanged between a device and a software client.

•  Input Report – Data sent from the HID device to the application, typically when the state of a control changes.
• Output Report – Data sent from the application to the HID device, for example to the LEDs on a keyboard.
• Feature Report -Data that can be manually read and/or written, and are typically related to configuration information.

Report Descriptor – The Report Descriptor describes the format and meaning of the data that the device supports.
UsageTables – Contain a list with descriptions of Usages, which describe the intended meaning and use of a particular item described in the Report Descriptor. For example, a Usage is defined for the left button of a mouse.  USB-IF WorkGroup Publishes the Usage Tables. See USB-IF HID Specifications.