unit UnitMain;

interface

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

type
  TKeyAlterMainForm = class(TForm)
    cb7toQ: TCheckBox;
    cb1toZ: TCheckBox;
    btnStart: TButton;
    XPManifest1: TXPManifest;
    sbBar: TStatusBar;
    procedure FormCreate(Sender: TObject);
    procedure btnStartClick(Sender: TObject);
    procedure cb7toQClick(Sender: TObject);
    procedure cb1toZClick(Sender: TObject);
    procedure FormClose(Sender: TObject; var Action: TCloseAction);
  private
    bIsHooOn: boolean;
    procedure HookOn;
    procedure HookOff;
    procedure OnHotKey(var Message: TWMHotKey); message WM_HOTKEY;
  public
    { Public declarations }
  end;

const
  WH_KEYBOARD_LL = 13;

var
  hHook: Windows.HHOOK;
  bIs7ToQ, bIs1ToZ: boolean;

type
  tagKBDLLHOOKSTRUCT = packed record
    vkCode:       DWORD;
    scanCode:     DWORD;
    flags:        DWORD;
    time:         DWORD;
    dwExtraInfo:  DWORD;
  end;
  KBDLLHOOKSTRUCT = tagKBDLLHOOKSTRUCT;
  PKBDLLHOOKSTRUCT = ^KBDLLHOOKSTRUCT;

var
  KeyAlterMainForm: TKeyAlterMainForm;

implementation

{$R *.dfm}

procedure TKeyAlterMainForm.FormCreate(Sender: TObject);
begin
  bIsHooOn := false;
  bIs7ToQ := true;
  bIs1ToZ := true;
  hHook := 0;
  RegisterHotKey(Handle, 1, 0, VK_F7);
end;

function KeyboardProc(nCode: integer; wParam: WPARAM; lParam: LPARAM): LRESULT; stdcall;
begin
  if nCode = HC_ACTION then
  begin
    if bIs7ToQ and (PKBDLLHOOKSTRUCT(lParam)^.vkCode = Ord('Q')) then
    begin
      if wParam = WM_KEYDOWN then
        keybd_event(VK_NUMPAD7, 0, 0, 0)
      else if wParam = WM_KEYUP then
        keybd_event(VK_NUMPAD7, 0, KEYEVENTF_KEYUP, 0);
      result := 1;
      exit;
    end;
    
    if bIs1ToZ and (PKBDLLHOOKSTRUCT(lParam)^.vkCode = Ord('Z')) then
    begin
      if wParam = WM_KEYDOWN then
        keybd_event(VK_NUMPAD1, 0, 0, 0)
      else if wParam = WM_KEYUP then
        keybd_event(VK_NUMPAD1, 0, KEYEVENTF_KEYUP, 0);
      result := 1;
      exit;
    end;
  end;

  result := CallNextHookEx(hHook, nCode, wParam, lParam);
end;

procedure TKeyAlterMainForm.btnStartClick(Sender: TObject);
begin
  if bIsHooOn then
    HookOff
  else
    HookOn;

  bIsHooOn := not bIsHooOn;
end;

procedure TKeyAlterMainForm.cb7toQClick(Sender: TObject);
begin
  bIs7ToQ := not bIs7ToQ;
end;

procedure TKeyAlterMainForm.cb1toZClick(Sender: TObject);
begin
  bIs1ToZ := not bIs1ToZ;
end;

procedure TKeyAlterMainForm.HookOff;
begin
  if hHook = 0 then exit;
  
  UnHookWindowsHookEx(hHook);
  hHook := 0;

  btnStart.Caption := '開始HOOK';

  sbBar.Panels[0].Text := 'HOOK已經停止...';

  MessageBeep(MB_OK);
end;

procedure TKeyAlterMainForm.HookOn;
begin
  if hHook <> 0 then exit;

  try
    hHook := SetWindowsHookEx(WH_KEYBOARD_LL, @KeyboardProc, hInstance, 0);
  except
    MessageBox(Handle, '啟動出錯', 'KeyAlter By Shilyx', MB_ICONERROR);
  end;

  btnStart.Caption := '停止HOOK';

  sbBar.Panels[0].Text := 'HOOK已經開始...';

  MessageBeep(MB_ICONINFORMATION);
end;

procedure TKeyAlterMainForm.OnHotKey(var Message: TWMHotKey);
begin
  if Message.HotKey = 1 then
    btnStart.Click;
end;

procedure TKeyAlterMainForm.FormClose(Sender: TObject; var Action: TCloseAction);
begin
  UnregisterHotKey(Handle, 1);
  HookOff;
end;

end.