[시스템] 마우스 아래의 윈도우 핸들 구하기

// 아래처럼 타이머를 사용하지 않고 마우스 후킹을 사용하면 좀더 간결한 프로그램을 만들 수 있습니다
// SetWindowsHookEx(WH_MOUSE,...) 를 찾아보세요

unit Unit1;

interface

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

type
  TForm1 = class(TForm)
    Timer1: TTimer;
    Memo1: TMemo;
    procedure Button1Click(Sender: TObject);
    procedure Timer1Timer(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

const
  PROCESS_MURDER = $0001;
  
var
  Form1: TForm1;

implementation

{$R *.dfm}

function ForceForegroundWindow(hwnd: THandle): boolean;
const
  SPI_GETFOREGROUNDLOCKTIMEOUT = $2000;
  SPI_SETFOREGROUNDLOCKTIMEOUT = $2001;
var
  ForegroundThreadID: DWORD;
  ThisThreadID: DWORD;
  timeout: DWORD;
begin
  if IsIconic(hwnd) then
    ShowWindow(hwnd, SW_RESTORE);
  if GetForegroundWindow = hwnd then
    Result := true
  else
  begin
    {Windows 98/2000 doesn't want to foreground a window when some
    other window has keyboard focus}
    if ((Win32Platform = VER_PLATFORM_WIN32_NT) and (Win32MajorVersion > 4))
       or ((Win32Platform = VER_PLATFORM_WIN32_WINDOWS) and ((Win32MajorVersion > 4)
       or ((Win32MajorVersion = 4) and (Win32MinorVersion > 0)))) then
    begin
      {Code from Karl E. Peterson, www.mvps.org/vb/sample.htm
      Converted to Delphi by Ray Lischner
      Published in The Delphi Magazine 55, page 16}
      Result := false;
      ForegroundThreadID := GetWindowThreadProcessID(GetForegroundWindow,nil);
      ThisThreadID := GetWindowThreadProcessId(hwnd,nil);
      if AttachThreadInput(ThisThreadID, ForegroundThreadID, true) then
      begin
        BringWindowToTop(hwnd);  {IE 5.5 related hack}
        SetForegroundWindow(hwnd);
        AttachThreadInput(ThisThreadID, ForegroundThreadID, false);
        Result := (GetForegroundWindow = hwnd);
      end;
      if not Result then
      begin
        {Code by Daniel P. Stasinski}
        SystemParametersInfo(SPI_GETFOREGROUNDLOCKTIMEOUT, 0, @timeout, 0);
        SystemParametersInfo(SPI_SETFOREGROUNDLOCKTIMEOUT, 0, TObject(0),
                                                     SPIF_SENDCHANGE);
        BringWindowToTop(hwnd);  {IE 5.5 related hack}
        SetForegroundWindow(hWnd);
        SystemParametersInfo(SPI_SETFOREGROUNDLOCKTIMEOUT, 0, TObject(timeout),
                                                     SPIF_SENDCHANGE);
      end;
    end
    else
    begin
      BringWindowToTop(hwnd);  {IE 5.5 related hack}
      SetForegroundWindow(hwnd);
    end;
    Result := (GetForegroundWindow = hwnd);
  end;
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
  ForceForegroundWindow(Self.Handle);
end;

procedure TForm1.Timer1Timer(Sender: TObject);
var
  APoint: TPoint;
  AHwnd: HWND;
  c, P: array[0..256] of Char;
begin
  GetCursorPos(APoint);
  AHwnd := WindowFromPoint(APoint);

  P[0] := #0;
  GetWindowText(AHwnd, P, 255); {window's title bar를 알아낸다}
  if (P[0] <> #0) then
  begin
    Memo1.Lines.Add(P);

    if GetClassName(AHwnd, c, SizeOf(c)) > 0 Then
      Memo1.Lines.Add(c);
  end;
end;

end.