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Malte Persike · Guest

Hello everybody,

the last hour I spent with frantically debugging a project in CBuilder6.
The project comprises both Delphi units and c++ source. One of the Delphi
units holds a class which makes use of class functions for a factory
method.

//////////
// TMyObject Delphi Source

TMyObject = class(TObject)
private
FName: string;
public
property Name: string read FName;
class function MakeInfo();
constructor Create(const AName: string); virtual;
end;

constructor TMyObject.Create(const AName: string);
begin
inherited Create;
FName:= AName;
end;

class function TMyObject.MakeInfo();
begin
Result:= Create('Info');
end;

The C++ Source invokes this method directly on the class.

///////////
// Calling the factory method

class TFoo {
public:
void __fastcall DoSomething();
};

void TFoo::DoSomething()
{
TMyObject* obj= TMyObject::MakeInfo(__classid(TMyObject));
...
}

DoSomething works, I can compile into the Delphi source and everything
looks good. But nonetheless obj does not seem to receive a valid
instance. CBuilder at some time raises an Access violation. When I try to
look at obj->Name while debugging the debugger tells me that obj is of
type void.

Can you help me sort out the code?

Kind regards,
Malte

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OBones · Guest

Malte Persike wrote:

Malte Persike · Guest

OBones <obones_ssspp (AT) gfgdf_meloo (DOT) com> wrote in
news:40ae04c5$1 (AT) newsgroups (DOT) borland.com:

Palle Meinert · Guest

You should always place your pascal file at top of your project manager
any-way. This is to make sure that the needed *.hpp files are generated and
ajour before they are included by any c++ units.

/Palle