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unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls;

 TMouseClicks = record
   Left: Integer;
   Middle: Integer;
   Right: Integer;
 end;
 
type
  TForm1 = class(TForm)
    label1: TLabel;
    procedure FormClose(Sender: TObject; var Action: TCloseAction);
    procedure FormCreate(Sender: TObject);
  private
    { Private declarations }
    FMouseClicksCounter: TMouseClicks;
    FHookStarted: Boolean;
    procedure StartJournalHook;
    procedure StopJournalHook;
    procedure DisplayMouseClicksCounter;
    function MessageHook(var Msg: TMessage): Boolean;
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

var
  JHook: HHOOK;

procedure TForm1.DisplayMouseClicksCounter;
begin
  label1.Caption := Format('L: %d; M: %d; R: %d', [FMouseClicksCounter.Left,
    FMouseClicksCounter.Middle, FMouseClicksCounter.Right]);
end;

function JournalProc(Code, wParam: Integer; var EventStrut: TEventMsg): Integer; stdcall;
const
  MouseMsgs: set of Byte = [WM_LBUTTONUP - $200, WM_RBUTTONUP - $200, WM_MBUTTONUP - $200];
begin
  Result := CallNextHookEx(JHook, Code, wParam, Longint(@EventStrut));
  if Code < 0 then Exit;
  if Code = HC_SYSMODALON then Exit;
  if Code = HC_ACTION then
  begin
    if (EventStrut.message - $200) in MouseMsgs then
    begin
      if EventStrut.message = WM_LBUTTONUP then Inc(FMouseClicksCounter.Left);
      if EventStrut.message = WM_RBUTTONUP then Inc(FMouseClicksCounter.Right);
      if EventStrut.message = WM_MBUTTONUP then Inc(FMouseClicksCounter.Middle);
      Form1.DisplayMouseClicksCounter;
    end;
  end;
end;

procedure TForm1.StartJournalHook;
begin
  JHook := SetWindowsHookEx(WH_JOURNALRECORD, @JournalProc, hInstance, 0);
  FHookStarted := JHook > 0;
end;

function TForm1.MessageHook(var Msg: TMessage): Boolean;
begin
  Result := False;
  if (Msg.Msg = WM_CANCELJOURNAL) and FHookStarted then
  begin
    JHook := SetWindowsHookEx(WH_JOURNALRECORD, @JournalProc, 0, 0);
    FHookStarted := JHook > 0;
  end;
end;

procedure TForm1.StopJournalHook;
begin
  if FHookStarted then
  begin
    UnhookWindowsHookEx(JHook);
    FHookStarted := False;
  end;
end;

procedure TForm1.FormClose(Sender: TObject; var Action: TCloseAction);
begin
  StopJournalHook;
end;

procedure TForm1.FormCreate(Sender: TObject);
begin
  FMouseClicksCounter.Left := 0;
  FMouseClicksCounter.Middle := 0;
  FMouseClicksCounter.Right := 0;
  StartJournalHook;
end;

end.