MODULE ComKoala;
(**

   project   = "BlackBox"
   organization   = "www.oberon.ch"
   contributors   = "Oberon microsystems"
   version   = "System/Rsrc/About"
   copyright   = "System/Rsrc/About"
   license   = "Docu/BB-License"
   references   = "adapted from Koala sample in "Inside OLE", 2nd ed."
   changes   = ""
   issues   = ""

**)

   IMPORT COM, WinApi, WinOle;


   
   
   CONST
      KoalaId = "{00021146-0000-0000-C000-000000000046}";
      
   
   TYPE
      Koala = POINTER TO RECORD (COM.IUnknown) END;
      KoalaFactory = POINTER TO RECORD (WinOle.IClassFactory) END;
   
   
   VAR
      locks: INTEGER;
      token: INTEGER;
      
      
   (* ---------- Koala ---------- *)
   
   (* use default QueryInterface implementation *)
   
   (* AddRef & Release implemented implicitly by the compiler *)
   
   
   (* ---------- KoalaFactory ---------- *)
   
   (* use default QueryInterface implementation *)
   
   (* AddRef & Release implemented implicitly by the compiler *)
   
   PROCEDURE (this: KoalaFactory) CreateInstance (outer: COM.IUnknown; IN [iid] iid: COM.GUID;
                                                         OUT [new] int: COM.IUnknown): COM.RESULT;
      VAR res: COM.RESULT; new: Koala;
   BEGIN
      IF outer # NIL THEN RETURN WinApi.CLASS_E_NOAGGREGATION END;
      NEW(new);
      IF new # NIL THEN RETURN new.QueryInterface(iid, int)
      ELSE RETURN WinApi.E_OUTOFMEMORY
      END
   END CreateInstance;
   
   PROCEDURE (this: KoalaFactory) LockServer (lock: WinApi.BOOL): COM.RESULT;
   BEGIN
      IF lock # 0 THEN INC(locks) ELSE DEC(locks) END;
      RETURN WinApi.S_OK
   END LockServer;
   
   (* ---------- registration ---------- *)

   
   PROCEDURE Register*;
      VAR res: COM.RESULT; factory: KoalaFactory;
   BEGIN
      NEW(factory);
      res := WinOle.CoRegisterClassObject(KoalaId, factory,
               WinOle.CLSCTX_LOCAL_SERVER, WinOle.REGCLS_MULTIPLEUSE, token)
   END Register;
   
   PROCEDURE Unregister*;
      VAR res: COM.RESULT;
   BEGIN
      IF (locks = 0) & (token # 0) THEN
         res := WinOle.CoRevokeClassObject(token)
      END
   END Unregister;
   
   
BEGIN   
   locks := 0
END ComKoala.
ComKoala.Register

ComKoala.Unregister