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unit EventSink;
{$mode objfpc}{$H+}
{ COM EventSink.
Copyright (C) 2011 Ludo Brands
This library is free software; you can redistribute it and/or modify it
under the terms of the GNU Library General Public License as published by
the Free Software Foundation; either version 2 of the License, or (at your
option) any later version with the following modification:
As a special exception, the copyright holders of this library give you
permission to link this library with independent modules to produce an
executable, regardless of the license terms of these independent modules,and
to copy and distribute the resulting executable under terms of your choice,
provided that you also meet, for each linked independent module, the terms
and conditions of the license of that module. An independent module is a
module which is not derived from or based on this library. If you modify
this library, you may extend this exception to your version of the library,
but you are not obligated to do so. If you do not wish to do so, delete this
exception statement from your version.
This program 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 Library General Public License
for more details.
You should have received a copy of the GNU Library General Public License
along with this library; if not, write to the Free Software Foundation,
Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
}
interface
uses
Windows, SysUtils, Classes, ActiveX;
type
TInvokeEvent = procedure(Sender: TObject; DispID: Integer;
const IID: TGUID; LocaleID: Integer; Flags: Word;
Params: TDispParams; VarResult, ExcepInfo, ArgErr: Pointer) of object;
{ TAbstractEventSink }
TAbstractEventSink = class(TObject, IDispatch,IUnknown) // see mantis #22156
private
FDispatch: IDispatch;
FDispIntfIID: TGUID;
FConnection: DWORD;
FOwner: TComponent;
protected
{ IUnknown }
frefcount : longint;
function QueryInterface(constref IID: TGUID; out Obj): HRESULT; stdcall;
function _AddRef : longint;stdcall;
function _Release : longint;stdcall;
{ IDispatch }
function GetTypeInfoCount(out Count: Integer): HRESULT; stdcall;
function GetTypeInfo(Index, LocaleID: Integer; out TypeInfo): HRESULT; stdcall;
function GetIDsOfNames(const IID: TGUID; Names: Pointer;
NameCount, LocaleID: Integer; DispIDs: Pointer): HRESULT; stdcall;
function Invoke(DispID: Integer; const IID: TGUID; LocaleID: Integer;
Flags: Word; var Params; VarResult, ExcepInfo, ArgErr: Pointer): HRESULT; stdcall;
public
constructor Create(AOwner: TComponent);
destructor Destroy; override;
procedure Connect(AnAppDispatch: IDispatch; const AnAppDispIntfIID: TGUID);
procedure Disconnect;
end;
TEventSink = class(TComponent)
private
FSink: TAbstractEventSink;
FOnInvoke: TInvokeEvent;
protected
procedure DoInvoke(DispID: Integer; const IID: TGUID;
LocaleID: Integer; Flags: Word; var Params;
VarResult, ExcepInfo, ArgErr: Pointer); virtual;
public
constructor Create(AOwner: TComponent); override;
destructor Destroy; override;
procedure Connect(AnAppDispatch: IDispatch; const AnAppDispIntfIID: TGUID);
published
property OnInvoke: TInvokeEvent read FOnInvoke write FOnInvoke;
end;
implementation
uses
ComObj;
procedure InterfaceConnect(const Source: IUnknown; const IID: TIID;
const Sink: IUnknown; var Connection: DWORD);
var
CPC: IConnectionPointContainer;
CP: IConnectionPoint;
i:hresult;
begin
Connection := 0;
if Succeeded(Source.QueryInterface(IConnectionPointContainer, CPC)) then
if Succeeded(CPC.FindConnectionPoint(IID, CP)) then
i:=CP.Advise(Sink, Connection);
end;
procedure InterfaceDisconnect(const Source: IUnknown; const IID: TIID;
var Connection: DWORD);
var
CPC: IConnectionPointContainer;
CP: IConnectionPoint;
i:hresult;
begin
if Connection <> 0 then
if Succeeded(Source.QueryInterface(IConnectionPointContainer, CPC)) then
if Succeeded(CPC.FindConnectionPoint(IID, CP)) then
begin
i:=CP.Unadvise(Connection);
if Succeeded(i) then Connection := 0;
end;
end;
{ TAbstractEventSink }
constructor TAbstractEventSink.Create(AOwner: TComponent);
begin
inherited Create;
FOwner := AOwner;
end;
destructor TAbstractEventSink.Destroy;
var p:pointer;
begin
inherited Destroy;
end;
function TAbstractEventSink.GetIDsOfNames(const IID: TGUID; Names: Pointer;
NameCount, LocaleID: Integer; DispIDs: Pointer): HRESULT; stdcall;
begin
Result := E_NOTIMPL;
end;
function TAbstractEventSink.GetTypeInfo(Index, LocaleID: Integer; out TypeInfo): HRESULT; stdcall;
begin
Result := E_NOTIMPL;
end;
function TAbstractEventSink.GetTypeInfoCount(out Count: Integer): HRESULT; stdcall;
begin
Count := 0;
Result := S_OK;
end;
function TAbstractEventSink.Invoke(DispID: Integer; const IID: TGUID;
LocaleID: Integer; Flags: Word; var Params; VarResult, ExcepInfo,
ArgErr: Pointer): HRESULT; stdcall;
begin
(FOwner as TEventSink).DoInvoke(DispID, IID, LocaleID, Flags,
Params, VarResult, ExcepInfo, ArgErr);
Result := S_OK;
end;
function TAbstractEventSink.QueryInterface(constref IID: TGUID; out Obj): HRESULT; stdcall;
begin
// We need to return the event interface when it's asked for
Result := E_NOINTERFACE;
if GetInterface(IID,Obj) then
Result := S_OK;
if IsEqualGUID(IID, FDispIntfIID) and GetInterface(IDispatch,Obj) then
Result := S_OK;
end;
function TAbstractEventSink._AddRef: longint; stdcall;
begin
frefcount:=frefcount+1;
_addref:=frefcount;
end;
function TAbstractEventSink._Release: longint; stdcall;
begin
frefcount:=frefcount-1;
_Release:=frefcount;
if frefcount=0 then
self.destroy;
end;
procedure TAbstractEventSink.Connect(AnAppDispatch: IDispatch;
const AnAppDispIntfIID: TGUID);
begin
FDispIntfIID := AnAppDispIntfIID;
FDispatch := AnAppDispatch;
// Hook the sink up to the automation server
InterfaceConnect(FDispatch, FDispIntfIID, Self, FConnection);
end;
procedure TAbstractEventSink.Disconnect;
begin
if Assigned(FDispatch) then begin
// Unhook the sink from the automation server
InterfaceDisconnect(FDispatch, FDispIntfIID, FConnection);
FDispatch := nil;
FConnection := 0;
end;
end;
{ TEventSink }
procedure TEventSink.Connect(AnAppDispatch: IDispatch;
const AnAppDispIntfIID: TGUID);
begin
FSink.Connect(AnAppDispatch, AnAppDispIntfIID);
end;
constructor TEventSink.Create(AOwner: TComponent);
begin
inherited Create(AOwner);
FSink := TAbstractEventSink.Create(self);
end;
destructor TEventSink.Destroy;
begin
FSink.Disconnect; // reference count will destroy FSink
// calling FSink.Destroy will raise error 204 since refcount=1 (not disconnected yet)
// FSink.Destroy;
inherited Destroy;
end;
procedure TEventSink.DoInvoke(DispID: Integer; const IID: TGUID;
LocaleID: Integer; Flags: Word; var Params; VarResult, ExcepInfo,
ArgErr: Pointer);
begin
if Assigned(FOnInvoke) then
FOnInvoke(self, DispID, IID, LocaleID, Flags, TDispParams(Params),
VarResult, ExcepInfo, ArgErr);
end;
end.
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