rawinput

Raw input refers to a method of receiving input from devices such as keyboards and mice that bypasses the standard Windows message-based input system. This allows applications to directly access the hardware's raw input data, offering lower latency and more precise control.

When an application uses Raw Input, it receives information about physical changes to input devices rather than processed keystrokes or mouse movements. This includes details like specific key presses and releases, mouse movement deltas, and button clicks. This direct access is particularly beneficial for games and other applications that require high responsiveness and accurate input handling.

To implement Raw Input, applications typically use the RegisterRawInputDevices function to register the devices they wish to monitor. They then enter a loop that waits for Raw Input messages. When a message arrives, the application can query the device data and process it accordingly. This approach allows for finer granularity in input management, enabling features like simultaneous key presses or precise mouse acceleration curves.

While Raw Input offers performance advantages, it also adds complexity to application development. Developers must manage the raw data directly, which can require more intricate programming compared to relying on the standard Windows input queue. Despite this, for applications where input performance is paramount, Raw Input remains a valuable tool.