library CatchWndMsg;

{ Important note about DLL memory management: ShareMem must be the
  first unit in your library's USES clause AND your project's (select
  Project-View Source) USES clause if your DLL exports any procedures or
  functions that pass strings as parameters or function results. This
  applies to all strings passed to and from your DLL--even those that
  are nested in records and classes. ShareMem is the interface unit to
  the BORLNDMM.DLL shared memory manager, which must be deployed along
  with your DLL. To avoid using BORLNDMM.DLL, pass string information
  using PChar or ShortString parameters. }

uses
  System.SysUtils,
  System.Classes,
  Winapi.Windows,
  WindowCatchWndMsg in 'WindowCatchWndMsg.pas',
  DefineWndMon in '..\DefineWndMon.pas';

{$R *.res}

var
  WindowActiveHook: TWindowCatchWndMsg = nil;

procedure DLLEntryPoint(dwReason: DWORD);
begin
  case dwReason of
    DLL_PROCESS_ATTACH :
    begin
      WindowActiveHook := TWindowCatchWndMsg.Create;
    end;

    DLL_PROCESS_DETACH :
    begin
      try
        if Assigned(WindowActiveHook) then
        begin
        {
          if WindowActiveHook.SharedData.IsAvailable then
          begin

            case THookState(WindowActiveHook.SharedData.Data.HookState) of
              hsFree    :
              begin
//                TSunkTrace.t('WindowActiveHook >>> DLL_PROCESS_DETACH >> HookState = hsFree');
              end;
              hsHooking :   // 이 경우는 메인에서 정식으로 DLL을 내린경우가 아니다. 다시 로드 할수 있게 한다.
              begin
//                TSunkTrace.t('WindowActiveHook >>> DLL_PROCESS_DETACH >> HookState = hsHooking, RcvWnd = %d', [WindowActiveHook.SharedData.Data.hRcvWnd]);
                PostMessage(WindowActiveHook.SharedData.Data.hRcvWnd, WM_WNDHOOK_RELOAD, GetCurrentProcessId, GetCurrentThreadId);
              end;
              hsReload  :
              begin
//                TSunkTrace.t('WindowActiveHook >>> DLL_PROCESS_DETACH >> HookState = hsReload');
              end;
              hsFinish  :   // 정상적인 DETACH 작업이라고 판단
              begin
//                TSunkTrace.t('WindowActiveHook >>> DLL_PROCESS_DETACH >> HookState = hsFinish');
                WindowActiveHook.SharedData.Data.HookState := hsFree;
              end;
            end;
          end;
          }
          FreeAndNil(WindowActiveHook);
        end;
      except
        //
      end;
    end;
  end;
end;

begin
  DllProc := @DLLEntryPoint;
  DLLEntryPoint(DLL_PROCESS_ATTACH);
end.