Keyboard Hook

System-Wide Keyboard Events Tracking Component for VCL

For all versions of Delphi and C++ Builder from 3 to 10.2 Tokyo and for all versions of Windows from XP to 10


Keyboard Hook component is a system-wide keyboard events tracker that works without external DLL.

TKeyboardHook Interface

protected

procedure KeyboardHookProc(VirtualKeyCode,ScanCode,Flags,Time: Integer; ExtraInfo: Pointer); virtual;
Hook calls this virtual procedure for each keyboard event, you can override it to implement your own keyboard events handlers in derived class.

public

constructor Create(AOwner: TComponent); override;
Overridden constructor creates object and initializes internal data.

destructor Destroy; override;
Overridden destructor frees internal data and destroys the object.

procedure Start;
Starts hook. You can also activate hook with Active property.

procedure Stop;
Stops hook. You can also deactivate hook with Active property.

property Active: Boolean;
Hook activity state.

published

property OnKeyboardHook: TKeyboardHookEvent;
This event occurs for each keyboard event and distributes low-level data for keyboard event. TKeyboardHookEvent is declared as 

TKeyboardHookEvent = 
  procedure(Sender: TObject;
  VirtualKeyCode,ScanCode,Flags,Time: Integer;
  ExtraInfo: Pointer) of object;
The event parameters contains keyboard message identifier and members of WinAPI's KBDLLHOOKSTRUCT structure.

property OnKeyDown: TKeyEvent;
Occurs when user presses key.

property OnKeyUp: TKeyEvent;
Occurs when user releases key.

property OnChars: TCharsEvent;
Occurs when user presses character key. TCharsEvent is declared as
TCharsEvent = procedure(Sender: TObject; Chars: string) of object;
When user enter dead-key character (accent or diacritic) the output can be more than 1 character.

Keyboard Hook component suite includes demo project that demonstrates main features of TKeyboardHook component:

Keyboard Hook Demo


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