File : gnatcom-create-factory.adb
------------------------------------------------------------------------------
-- --
-- GNATCOM - Ada 95 COM/DCOM/COM+ Development Framework and Tools --
-- --
-- G N A T C O M . C R E A T E . F A C T O R Y --
-- --
-- B o d y --
-- --
-- $Revision: 1.3 $
-- --
-- Copyright (C) 1999, 2000, 2001 David Botton --
-- --
-- This is free software; you can redistribute it and/or modify it under --
-- terms of the GNU General Public License as published by the Free Soft- --
-- ware Foundation; either version 2, or (at your option) any later ver- --
-- sion. It is distributed in the hope that it will be useful, but WITHOUT --
-- ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or --
-- FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
-- for more details. You should have received a copy of the GNU General --
-- Public License distributed with this; see file COPYING. If not, write --
-- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
-- MA 02111-1307, USA. --
-- --
-- As a special exception, if other files instantiate generics from this --
-- unit, or you link this unit with other files to produce an executable, --
-- this unit does not by itself cause the resulting executable to be --
-- covered by the GNU General Public License. This exception does not --
-- however invalidate any other reasons why the executable file might be --
-- covered by the GNU Public License. --
-- --
-- More information about GNATCOM and the most current public version can --
-- be located on the web at http://www.adapower.com/gnatcom --
-- --
-- Support for GNATCOM is available from Ada Core Technologies, Inc. --
-- --
-- In the U.S., contact Ada Core Technologies at: --
-- Tel: +1 (212) 620 7300 ext 117 --
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-- Email: sales@gnat.com --
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-- In Europe and elsewhere, contact ACT Europe at: --
-- Tel: +33 1 49 70 67 16 --
-- Fax: +33 1 49 70 05 52 --
-- Email: sales@act-europe.fr --
------------------------------------------------------------------------------
with System;
with Ada.Unchecked_Conversion;
with Ada.Unchecked_Deallocation;
package body GNATCOM.Create.Factory is
CLASS_E_NOAGGREGATION : constant := 16#80040110#;
procedure Free (Pointer : in System.Address);
-- Free Factory
function InterlockedIncrement
(lpAddend : access Interfaces.C.long) return Interfaces.C.long;
pragma Import (StdCall, InterlockedIncrement, "InterlockedIncrement");
-- Win32 API for protected increment of a long
function InterlockedDecrement
(lpAddend : access Interfaces.C.long) return Interfaces.C.long;
pragma Import (StdCall, InterlockedDecrement, "InterlockedDecrement");
-- Win32 API for protected decrement of a long
------------
-- AddRef --
------------
function AddRef
(This : access IClassFactory)
return Interfaces.C.unsigned_long
is
Result : Interfaces.C.long;
begin
-- Add a ref count to the interface, which in this case
-- is also the object
Result := InterlockedIncrement (This.Ref_Count'Access);
return Interfaces.C.unsigned_long (This.Ref_Count);
end AddRef;
--------------------
-- CreateInstance --
--------------------
function CreateInstance
(This : access IClassFactory;
pUnkOuter : in GNATCOM.Types.Pointer_To_IUnknown;
riid : in GNATCOM.Types.Pointer_To_GUID;
ppvObject : access GNATCOM.Types.Pointer_To_Void)
return GNATCOM.Types.HRESULT
is
use type GNATCOM.Types.Pointer_To_IUnknown;
Object : GNATCOM.Create.COM_Interface.Pointer_To_COM_Interface_Type;
hr : GNATCOM.Types.HRESULT;
Result : Interfaces.C.long;
Refcount : Interfaces.C.unsigned_long;
begin
if pUnkOuter /= null then
return CLASS_E_NOAGGREGATION;
end if;
-- Create Object
Object := This.Create.all;
-- Since we have created an object, we increment in the global
-- component count. if the following QueryInterface fails,
-- the release after it will also end up reducing this count.
Result := InterlockedIncrement (GNATCOM.Create.Component_Count'Access);
-- Ask the object for an interface with IID riid
hr := GNATCOM.Create.COM_Interface.QueryInterface (Object,
riid,
ppvObject);
-- When the object is created it and its first interface have a default
-- reference count of 1. If the QueryInterface succeeded it is now 2
-- if it didn't then the next release will reduce it to 0 and clean
-- up the Interface (and in this case since there are no other
-- interfaces referenced clean up the object)
Refcount := GNATCOM.Create.COM_Interface.Release (Object);
return hr;
end CreateInstance;
----------------
-- LockServer --
----------------
function LockServer
(This : access IClassFactory;
fLock : in GNATCOM.Types.bool)
return GNATCOM.Types.HRESULT
is
use type Interfaces.C.long;
pragma Warnings (Off, This);
Result : Interfaces.C.long;
begin
if fLock /= 0 then
Result := InterlockedIncrement
(GNATCOM.Create.Server_Lock_Count'Access);
else
Result := InterlockedDecrement
(GNATCOM.Create.Server_Lock_Count'Access);
end if;
-- If this is a LocalServer, then a check will be performed
-- to determine if the server should shutdown
GNATCOM.Create.Can_Close;
return S_OK;
end LockServer;
--------------------
-- QueryInterface --
--------------------
function QueryInterface
(This : access IClassFactory;
riid : in GNATCOM.Types.Pointer_To_GUID;
ppvObject : access GNATCOM.Types.Pointer_To_Void)
return GNATCOM.Types.HRESULT
is
use type GNATCOM.Types.GUID;
Result : Interfaces.C.long;
begin
if riid.all = GNATCOM.Types.IID_IUnknown then
ppvObject.all := This.all'Address;
elsif riid.all = GNATCOM.Types.IID_IClassFactory then
ppvObject.all := This.all'Address;
else
ppvObject.all := System.Null_Address;
return E_NOINTERFACE;
end if;
-- When returning new interfaces from any function you must
-- always add a reference count to that interface directly
-- or through a call to its AddRef
Result := InterlockedIncrement (This.Ref_Count'Access);
return S_OK;
end QueryInterface;
-------------
-- Release --
-------------
function Release
(This : access IClassFactory)
return Interfaces.C.unsigned_long
is
use type Interfaces.C.long;
begin
if InterlockedDecrement (This.Ref_Count'Access) /= 0 then
return Interfaces.C.unsigned_long (This.Ref_Count);
else
-- Last reference to IClassFactory and IUnknown released,
-- so free the object
Free (This.all'Address);
return 0;
end if;
end Release;
----------
-- Free --
----------
procedure Free (Pointer : in System.Address) is
procedure Free is
new Ada.Unchecked_Deallocation (IClassFactory,
Pointer_To_IClassFactory);
function To_Pointer_To_IClassFactory is
new Ada.Unchecked_Conversion (System.Address,
Pointer_To_IClassFactory);
X : Pointer_To_IClassFactory;
begin
X := To_Pointer_To_IClassFactory (Pointer);
Free (X);
end Free;
end GNATCOM.Create.Factory;