RFID Keyboard-Wedge Reader
A .NET component that reconstructs a 4-byte RFID UID from eight hexadecimal keyboard events, handling Turkish Q/F layouts and keeping the per-key path allocation-minimal.
Some RFID readers expose no application-specific protocol at all: after reading a card they simply inject eight hexadecimal keystrokes. This repository focuses on that operating-system boundary. It does not implement the RF protocol; it reconstructs the UID from keyboard-wedge events that have already reached Windows.
Turkish Q and F layouts make a naïve A-F key assumption unreliable, so the virtual-key-to-nibble mapping is explicit. Each accepted nibble is folded into the numeric value with partial = (partial << 4) | nibble, avoiding an intermediate eight-character UID string on the normal key path. Depending on focus and message-routing requirements, the same decoder can be integrated through KeyDown, IMessageFilter, WndProc, or WH_KEYBOARD_LL.
The decoded UID remains an identifier, not a credential. A clonable or observable card identifier should not be promoted into an authentication mechanism merely because it arrived through an RFID reader.
Implementation notes: Reading a 4-Byte RFID UID Through a Keyboard-Wedge/HID Reader in .NET
