Doc/view: how to notify open/save failure?

[Biozic]

Hi,

I am trying to use the document/view framework. I have overridden 
wxDocument::LoadObject to parse my data files. I am now told (by the 
documentation) that wxDocument::OnOpenDocument calls 
wxDocument::LoadObject and that if LoadObject does not return true, an 
error message box is displayed.

wxDocument::LoadObject does not return a boolean!...

I have managed to get the desired effect by inserting

	stream.setstate(std::ios_base::failbit);

in LoadObject (since I am using the standard stream version), but this 
looks weird to me, and I wonder if this is relevant or if there is a 
more simple solution?

Thanks
Nicolas