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{
This file is part of the Free Pascal run time library.
Copyright (c) 2006 by Florian Klaempfl
member of the Free Pascal development team.
See the file COPYING.FPC, included in this distribution,
for details about the copyright.
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.
**********************************************************************}
{$mode objfpc}
{$H+}
{$inline on}
unit ComServ;
interface
uses
Classes, SysUtils, comobj, ActiveX;
{ $define DEBUG_COM}
//according to doc
// * ComServer Variable
// * DllCanUnloadNow Routine
// * DllGetClassObject Routine
// * DllRegisterServer Routine
// * DllUnregisterServer Routine
// * TComServer Class
//TODO Fix this
const
CLASS_E_CLASSNOTAVAILABLE = -1;
SELFREG_E_CLASS = -2;
type
TStartMode = (smStandalone, smAutomation,smRegserver,smUnregserver);
TLastReleaseEvent = procedure(var shutdown: Boolean) of object;
{ TComServer }
TComServer = class(TComServerObject)
class var orgInitProc: codepointer;
private
fCountObject: Integer;
fCountFactory: Integer;
fTypeLib: ITypeLib;
fServerName,
fServerFileName: String;
fHelpFileName : String;
fRegister: Boolean;
fStartSuspended : Boolean;
FIsInproc: Boolean;
FIsInteractive: Boolean;
FStartMode: TStartMode;
FOnLastRelease: TLastReleaseEvent;
class function AutomationDone: Boolean;
class procedure AutomationStart;
procedure CheckCmdLine;
procedure FactoryFree(Factory: TComObjectFactory);
procedure FactoryRegisterClassObject(Factory: TComObjectFactory);
procedure FactoryUpdateRegistry(Factory: TComObjectFactory);
procedure CheckReleased;
function GetTypeLibName: widestring;
procedure RegisterObjectWith(Factory: TComObjectFactory);
procedure Start;
protected
function CountObject(Created: Boolean): Integer; override;
function CountFactory(Created: Boolean): Integer; override;
function GetHelpFileName: string; override;
function GetServerFileName: string; override;
function GetServerKey: string; override;
function GetServerName: string; override;
function GetStartSuspended: Boolean; override;
function GetTypeLib: ITypeLib; override;
procedure SetHelpFileName(const Value: string); override;
procedure RegisterServerFactory(Factory: TComObjectFactory);
procedure UnregisterServerFactory(Factory: TComObjectFactory);
public
constructor Create;
destructor Destroy; override;
function CanUnloadNow: Boolean;
procedure RegisterServer;
procedure UnRegisterServer;
property IsInprocServer: Boolean read FIsInproc write FIsInproc;
property IsInteractive: Boolean read fIsInteractive;
property StartMode: TStartMode read FStartMode;
property ServerObjects:integer read fCountObject;
end;
var
ComServer: TComServer = nil;
haut :TLibHandle;
//http://msdn.microsoft.com/en-us/library/ms690368%28VS.85%29.aspx
//If the function succeeds, the return value is S_OK. Otherwise, it is S_FALSE.
function DllCanUnloadNow: HResult; stdcall;
//S_OK - The object was retrieved successfully.
//CLASS_E_CLASSNOTAVAILABLE - The DLL does not support the class (object definition).
function DllGetClassObject(constref rclsid: REFIID {should be REFCLSID}; constref riid: REFIID; out ppv: Pointer): HResult; stdcall;
//S_OK - The registry entries were created successfully.
//SELFREG_E_TYPELIB - The server was unable to complete the registration of all the type libraries used by its classes.
//SELFREG_E_CLASS - The server was unable to complete the registration of all the object classes.
function DllRegisterServer: HResult; stdcall;
//S_OK - The registry entries were deleted successfully.
//S_FALSE - Unregistration of this server's known entries was successful, but other entries still exist for this server's classes.
//SELFREG_E_TYPELIB - The server was unable to remove the entries of all the type libraries used by its classes.
//SELFREG_E_CLASS - The server was unable to remove the entries of all the object classes.
function DllUnregisterServer: HResult; stdcall;
implementation
uses
Windows;
function DllCanUnloadNow: HResult; stdcall;
begin
{$ifdef DEBUG_COM}
WriteLn('DllCanUnloadNow called');
{$endif}
if ComServer.CanUnloadNow then
Result := S_OK
else
Result := S_FALSE;
{$ifdef DEBUG_COM}
WriteLn('DllCanUnloadNow return: ', Result);
{$endif}
end;
(*
//FROM MSDN (Error messages are different in MSDN.DllGetClassObject)
HRESULT hres = E_OUTOFMEMORY;
*ppvObj = NULL;
CClassFactory *pClassFactory = new CClassFactory(rclsid);
if (pClassFactory != NULL) {
hRes = pClassFactory->QueryInterface(riid, ppvObj);
pClassFactory->Release();
}
return hRes;
*)
function DllGetClassObject(constref rclsid: REFIID {should be REFCLSID}; constref riid: REFIID; out ppv: Pointer): HResult; stdcall;
var
factory: TComObjectFactory;
begin
{$ifdef DEBUG_COM}
WriteLn('DllGetClassObject called: ', GUIDToString(rclsid), ' ', GUIDToString(riid));
{$endif}
factory := ComClassManager.GetFactoryFromClassID(rclsid);
if factory = nil then
Result := CLASS_E_CLASSNOTAVAILABLE
else
begin
if factory.GetInterface(riid,ppv) then
Result := S_OK
else
Result := CLASS_E_CLASSNOTAVAILABLE;
{$ifdef DEBUG_COM}
WriteLn('DllGetClassObject return: ', Result);
{$endif}
end;
end;
function DllRegisterServer: HResult; stdcall;
begin
{$ifdef DEBUG_COM}
WriteLn('DllRegisterServer called');
{$endif}
try
ComServer.RegisterServer;
Result := S_OK;
except
Result := SELFREG_E_CLASS;
end;
end;
function DllUnregisterServer: HResult; stdcall;
begin
{$ifdef DEBUG_COM}
WriteLn('DllUnregisterServer called');
{$endif}
try
ComServer.UnregisterServer;
Result := S_OK;
except
Result := SELFREG_E_CLASS;
end;
end;
function GetModuleFileName: String;
const
MAX_PATH_SIZE = 2048;
begin
SetLength(Result, MAX_PATH_SIZE);
SetLength(Result, Windows.GetModuleFileName(HInstance, @Result[1], MAX_PATH_SIZE));
end;
function GetModuleName: String;
begin
Result := ExtractFileName(GetModuleFileName);
Result := Copy(Result, 1,LastDelimiter('.', Result)-1);
end;
procedure RegisterTypeLib(TypeLib: ITypeLib; const ModuleName: string);
var
FullPath: WideString;
begin
FullPath := ModuleName;
//according to MSDN helpdir can be null
OleCheck(ActiveX.RegisterTypeLib(TypeLib, @FullPath[1], nil));
end;
procedure UnRegisterTypeLib(TypeLib: ITypeLib);
var
ptla: PTLibAttr;
begin
//http://www.experts-exchange.com/Programming/Misc/Q_20634807.html
OleCheck(TypeLib.GetLibAttr(ptla));
try
ActiveX.UnRegisterTypeLib(ptla^.guid, ptla^.wMajorVerNum, ptla^.wMinorVerNum, ptla^.lcid, ptla^.syskind);
finally
TypeLib.ReleaseTLibAttr(ptla);
end;
end;
{ TComServer }
function TComServer.CountObject(Created: Boolean): Integer;
begin
if Created then
begin
Result := InterlockedIncrement(FCountObject);
if (not IsInProcServer) and (StartMode = smAutomation)
and Assigned(ComObj.CoAddRefServerProcess) then
ComObj.CoAddRefServerProcess;
end
else
begin
Result := InterlockedDecrement(FCountObject);
if (not IsInProcServer) and (StartMode = smAutomation)
and Assigned(ComObj.CoReleaseServerProcess) then
begin
if ComObj.CoReleaseServerProcess() = 0 then
CheckReleased;
end
else if Result = 0 then
CheckReleased;
end;
end;
function TComServer.CountFactory(Created: Boolean): Integer;
begin
if Created then
Result:=InterLockedIncrement(fCountFactory)
else
Result:=InterLockedDecrement(fCountFactory);
end;
procedure TComServer.FactoryFree(Factory: TComObjectFactory);
begin
Factory.Free;
end;
procedure TComServer.FactoryRegisterClassObject(Factory: TComObjectFactory);
begin
Factory.RegisterClassObject;
end;
procedure TComServer.FactoryUpdateRegistry(Factory: TComObjectFactory);
begin
if Factory.Instancing <> ciInternal then
Factory.UpdateRegistry(FRegister);
end;
function TComServer.GetHelpFileName: string;
begin
result:=fhelpfilename;
end;
function TComServer.GetServerFileName: string;
begin
Result := fServerFileName;
end;
function TComServer.GetServerKey: string;
begin
if FIsInproc then
Result := 'InprocServer32'
else
Result := 'LocalServer32';
end;
function TComServer.GetServerName: string;
begin
if FServerName <> '' then
Result := FServerName
else
if FTypeLib <> nil then
Result := GetTypeLibName
else
Result := GetModuleName;
end;
function TComServer.GetTypeLibName: widestring;
begin
OleCheck(TypeLib.GetDocumentation(-1, @Result, nil, nil, nil));
end;
function TComServer.GetStartSuspended: Boolean;
begin
result:=fStartSuspended;
end;
function TComServer.GetTypeLib: ITypeLib;
begin
Result := fTypeLib;
end;
procedure TComServer.RegisterObjectWith(Factory: TComObjectFactory);
begin
Factory.RegisterClassObject;
end;
procedure TComServer.Start;
begin
case fStartMode of
smRegServer:
begin
Self.RegisterServer;
Halt;
end;
smUnregServer:
begin
Self.UnRegisterServer;
Halt;
end;
end;
ComClassManager.ForEachFactory(Self, @RegisterObjectWith);
end;
procedure TComServer.SetHelpFileName(const Value: string);
begin
FHelpFileName:=value;
end;
procedure TComServer.RegisterServerFactory(Factory: TComObjectFactory);
begin
Factory.UpdateRegistry(True);
end;
procedure TComServer.UnregisterServerFactory(Factory: TComObjectFactory);
begin
Factory.UpdateRegistry(False);
end;
procedure TComServer.CheckCmdLine;
const
sw_set:TSysCharSet = ['/','-'];
begin
if FindCmdLineSwitch('automation',sw_set,true) or
FindCmdLineSwitch('embedding',sw_set,true) then
fStartMode := smAutomation
else if FindCmdlIneSwitch('regserver',sw_set,true) then
fStartMode := smRegServer
else if FindCmdLineSwitch('unregserver',sw_set,true) then
fStartMode := smUnregServer;
end;
constructor TComServer.Create;
var
name: WideString;
begin
haut := SafeLoadLibrary('oleaut32.DLL');
CheckCmdLine;
inherited Create;
{$ifdef DEBUG_COM}
WriteLn('TComServer.Create');
{$endif}
fCountFactory := 0;
fCountObject := 0;
FTypeLib := nil;
FIsInproc := ModuleIsLib;
fServerFileName := GetModuleFileName();
name := fServerFileName;
if not(Succeeded(LoadTypeLib(@name[1], fTypeLib))) then
fTypeLib := nil;
if FTypeLib <> nil then
begin
fTypeLib.GetDocumentation(-1, @name, nil, nil, nil);
fServerName := name;
end
else
fServerName := GetModuleName;
if not ModuleIsLib then
begin
orgInitProc := InitProc;
InitProc := @TComServer.AutomationStart;
// AddTerminateProc(TTerminateProc(@TComServer.AutomationDone));
end;
Self.FIsInteractive := True;
end;
class procedure TComServer.AutomationStart;
begin
if orgInitProc <> nil then TProcedure(orgInitProc)();
ComServer.FStartSuspended := (CoInitFlags <> -1) and
Assigned(ComObj.CoInitializeEx) and Assigned(ComObj.CoResumeClassObjects);
ComServer.Start;
if ComServer.FStartSuspended then
ComObj.CoResumeClassObjects;
end;
class function TComServer.AutomationDone: Boolean;
begin
Result := True;
if (ComServer <> nil) and (ComServer.ServerObjects > 0) and ComServer.IsInteractive then
begin
Result := MessageBox(0, PChar('COM server is in use'),
PChar('OLE Automation'), MB_YESNO or MB_TASKMODAL or
MB_ICONWARNING or MB_DEFBUTTON2) = IDYES;
end;
end;
procedure TComServer.CheckReleased;
var
Shutdown: Boolean;
begin
if not FIsInproc then
begin
Shutdown := FStartMode = smAutomation;
try
if Assigned(FOnLastRelease) then FOnLastRelease(Shutdown);
finally
if Shutdown then PostThreadMessage(MainThreadID, WM_QUIT, 0, 0);
end;
end;
end;
destructor TComServer.Destroy;
begin
ComClassManager.ForEachFactory(Self, @FactoryFree,true);
Self.fTypeLib:=nil;
inherited Destroy;
FreeLibrary(haut);
{$ifdef DEBUG_COM}
WriteLn('TComServer.Destroy');
{$endif}
end;
function TComServer.CanUnloadNow: Boolean;
begin
Result := False;
end;
procedure TComServer.RegisterServer;
begin
if fTypeLib <> nil then
RegisterTypeLib(fTypeLib, fServerFileName);
ComClassManager.ForEachFactory(self, @RegisterServerFactory);
end;
procedure TComServer.UnRegisterServer;
begin
if fTypeLib <> nil then
UnRegisterTypeLib(fTypeLib);
ComClassManager.ForEachFactory(self, @UnregisterServerFactory);
end;
initialization
{$ifdef DEBUG_COM}
WriteLn('comserv initialization begin');
{$endif}
ComServer := TComServer.Create;
{$ifdef DEBUG_COM}
WriteLn('comserv initialization end');
{$endif}
finalization
ComServer.AutomationDone;
FreeAndNil(ComServer);
end.
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