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{
*********************************************************************
Copyright (C) 2002 Peter Vreman,
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.
*********************************************************************
}
function Supports(const Instance: IInterface; const AClass: TClass; out Obj): Boolean;
begin
Result := (Instance<>nil) and (Instance.QueryInterface(IObjectInstance,Obj)=S_OK) and (TObject(Obj).InheritsFrom(AClass));
end;
function Supports(const Instance: IInterface; const IID: TGUID; out Intf): Boolean;
begin
Result:=(Instance<>nil) and (Instance.QueryInterface(IID,Intf)=S_OK);
end;
function Supports(const Instance: TObject; const IID: TGUID; out Intf): Boolean;
var
Temp: Pointer; // weak
begin
Result:=(Instance<>nil) and ((Instance.GetInterfaceWeak(IInterface,Temp) and (IInterface(Temp).QueryInterface(IID,Intf)=S_OK))
or Instance.GetInterface(IID,Intf));
{ Some applications expect that the QueryInterface method is invoked as first priority
to query for an interface and GetInterface as 2nd priority }
end;
function Supports(const Instance: TObject; const IID: Shortstring; out Intf): Boolean;
begin
Result:=(Instance<>nil) and Instance.GetInterface(IID,Intf);
end;
function Supports(const Instance: IInterface; const AClass: TClass): Boolean;
var
Temp: TObject;
begin
Result:=Supports(Instance,AClass,Temp);
end;
function Supports(const Instance: IInterface; const IID: TGUID): Boolean;
var
Temp: IInterface;
begin
Result:=Supports(Instance,IID,Temp);
end;
function Supports(const Instance: TObject; const IID: TGUID): Boolean;
var
Temp: IInterface;
begin
Result:=Supports(Instance,IID,Temp);
end;
function Supports(const Instance: TObject; const IID: Shortstring): Boolean;
begin
Result:=(Instance<>nil) and (Instance.GetInterfaceEntryByStr(IID)<>nil);
end;
function Supports(const AClass: TClass; const IID: TGUID): Boolean;
begin
Result:=(AClass<>nil) and (AClass.GetInterfaceEntry(IID)<>nil);
end;
function Supports(const AClass: TClass; const IID: Shortstring): Boolean;
begin
Result:=(AClass<>nil) and (AClass.GetInterfaceEntryByStr(IID)<>nil);
end;
function StringToGUID(const S: string): TGUID;
begin
if not TryStringToGUID(S, Result) then
raise EConvertError.CreateFmt(SInvalidGUID, [S]);
end;
function TryStringToGUID(const S: string; out Guid: TGUID): Boolean;
var
e: Boolean;
p: PChar;
function rb: Byte;
begin
case p^ of
'0'..'9': Result := Byte(p^) - Byte('0');
'a'..'f': Result := Byte(p^) - Byte('a') + 10;
'A'..'F': Result := Byte(p^) - Byte('A') + 10;
else e := False;
end;
Inc(p);
end;
procedure nextChar(c: Char); inline;
begin
if p^ <> c then
e := False;
Inc(p);
end;
begin
if Length(S)<>38 then Exit(False);
e := True;
p := PChar(S);
nextChar('{');
Guid.D1 := rb shl 28 or rb shl 24 or rb shl 20 or rb shl 16 or rb shl 12 or rb shl 8 or rb shl 4 or rb;
nextChar('-');
Guid.D2 := rb shl 12 or rb shl 8 or rb shl 4 or rb;
nextChar('-');
Guid.D3 := rb shl 12 or rb shl 8 or rb shl 4 or rb;
nextChar('-');
Guid.D4[0] := rb shl 4 or rb;
Guid.D4[1] := rb shl 4 or rb;
nextChar('-');
Guid.D4[2] := rb shl 4 or rb;
Guid.D4[3] := rb shl 4 or rb;
Guid.D4[4] := rb shl 4 or rb;
Guid.D4[5] := rb shl 4 or rb;
Guid.D4[6] := rb shl 4 or rb;
Guid.D4[7] := rb shl 4 or rb;
nextChar('}');
Result := e;
end;
function IsEqualGUID(const guid1, guid2: TGUID): Boolean;
var
a1,a2: PIntegerArray;
begin
a1:=PIntegerArray(@guid1);
a2:=PIntegerArray(@guid2);
Result:=(a1^[0]=a2^[0]) and
(a1^[1]=a2^[1]) and
(a1^[2]=a2^[2]) and
(a1^[3]=a2^[3]);
end;
function GuidCase(const GUID: TGUID; const List: array of TGuid): Integer;
begin
for Result := High(List) downto 0 do
if IsEqualGUID(GUID, List[Result]) then
Exit;
Result := -1;
end;
function GUIDToString(const GUID: TGUID): string;
begin
SetLength(Result, 38);
StrLFmt(PChar(Result), 38,'{%.8x-%.4x-%.4x-%.2x%.2x-%.2x%.2x%.2x%.2x%.2x%.2x}',
[
Longint(GUID.D1), GUID.D2, GUID.D3,
GUID.D4[0], GUID.D4[1], GUID.D4[2], GUID.D4[3],
GUID.D4[4], GUID.D4[5], GUID.D4[6], GUID.D4[7]
]);
end;
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