Python4Delphi: Returning a python object in a function. (DelphiWrapper)
- by Gabriel Fonseca
I am using python4delphi. ow can I return an object from a wrapped Delphi class function?
Code Snippet:
I have a simple Delphi Class that i wrapped to Python Script, right?
TSimple = Class
Private
function getvar1:string;
Public
Published
property var1:string read getVar1;
function getObj:TSimple;
end;
...
function TSimple.getVar1:string;
begin
result:='hello';
end;
function TSimple.getObj:TSimple;
begin
result:=self;
end;
I made the TPySimple like the demo32 to give class access to the python code. My python module name is test.
TPyDado = class(TPyDelphiPersistent)
// Constructors & Destructors
constructor Create( APythonType : TPythonType ); override;
constructor CreateWith( PythonType : TPythonType; args : PPyObject ); override;
// Basic services
function Repr : PPyObject; override;
class function DelphiObjectClass : TClass; override;
end;
...
{ TPyDado }
constructor TPyDado.Create(APythonType: TPythonType);
begin
inherited;
// we need to set DelphiObject property
DelphiObject := TDado.Create;
with TDado(DelphiObject) do begin
end;
Owned := True; // We own the objects we create
end;
constructor TPyDado.CreateWith(PythonType: TPythonType; args: PPyObject);
begin
inherited;
with GetPythonEngine, DelphiObject as TDado do
begin
if PyArg_ParseTuple( args, ':CreateDado' ) = 0 then
Exit;
end;
end;
class function TPyDado.DelphiObjectClass: TClass;
begin
Result := TDado;
end;
function TPyDado.Repr: PPyObject;
begin
with GetPythonEngine, DelphiObject as TDado do
Result := VariantAsPyObject(Format('',[]));
// or Result := PyString_FromString( PAnsiChar(Format('(%d, %d)',[x, y])) );
end;
And now the python code:
import test
a = test.Simple()
# try access the property var1 and everything is right
print a.var1
# work's, but..
b = a.getObj();
# raise a exception that not find any attributes named getObj.
# if the function returns a string for example, it's work.
