Keyboard Class

Package: GHIElectronics.Endpoint.Devices.UsbHost
Namespace: GHIElectronics.Endpoint.Devices.UsbHost

Allows a usb device to be used as a keyboard.

public class Keyboard : BaseDevice

Remarks

The CharUp and CharDown events are only fired when a given key press has a corresponding ASCII key code (a US keyboard; Ctrl+A to Ctrl+Z give 1 to 26). A key held down gives one KeyDown. The events come on the keyboard's own thread.

Nested Types

Type	Kind	Summary
Keyboard.KeyboardEventArgs	Class	Event arguments for the keyboard events.
Keyboard.KeyboardEventHandler	Delegate	The handler for used for keyboard callbacks.

Constructors

Keyboard(string deviceName)

public Keyboard(string deviceName)

Opens the keyboard that UsbHostController reported ("/dev/input/event1").

Methods

IsKeyPressed(Key key)

public KeyState IsKeyPressed(Key key)

Gets the current state of a key.

Parameter	Type	Description
key	Key	The key to query.

Returns KeyState: The state of the key.

Events

CharDown

public event KeyboardEventHandler CharDown

Fired when a key is pressed and it can be converted to ASCII.

CharUp

public event KeyboardEventHandler CharUp

Fired when a key is released and it can be converted to ASCII.

KeyDown

public event KeyboardEventHandler KeyDown

Fired when a key is pressed.

KeyUp

public event KeyboardEventHandler KeyUp

Fired when a key is released.