USB RS232 - FTDI designs and supplies USB semiconductor devices with Legacy support including royalty-free drivers. Application areas include USB RS232, ( USB Serial. The light blinks faintly about once a second. It is slowly driving me insane. How do I find out which program is causing this, so I can disable it? Acer 5274 laptop. This site has been designed with and for Firefox. It may work in Internet Explorer as well. Hi, I get a problem that the RegisterDeviceNotification() returns NULL all the way in execution. here i list my code snippnet: HidD_GetHidGuid(&m_guidHID); Welcome to my article. Today, I would like to show you how to determine whether or not a USB stick has been inserted or removed. There are various ways. // Component to detect when usb devices are connected or disconnected // using RegisterDeviceNotification unit U_Usb; interface uses Windows, Messages, SysUtils. I have used both device interfaces and symbolic links and quite frankly I do not see any advantages to using device interfaces. They are cumbersome for the user. How to detect device changes in the user-mode applications for Windows; Author: Eugene Kordin, Apriorit Inc; Updated: 18 Oct 2010; Section: Algorithms & Recipes. Copyright © 2010 Future Technology Devices International Limited 3 Document Reference No.: FT_000328 How to Detect the Connection and Removal of USB Devices on a System Home USB Central The HID Page. The HID Page. For developers of USB devices in the human interface device (HID) class. Basics | Tools | My example code | Other.