[Gdal-dev] RE: need RTTI for OGR (Windows)

[Chapman, Martin]

Ellen,

I just found this.  You're correct, it doesn't work with the change I
suggested but it should have.

// FOUND ON THE WEB FOR ANOTHER PROJECT

Important Warning: Please note that the MSVC.Net 2003 (7.1) C++ compiler
has a bug that returns a wrong 'this' pointer when calling virtual
functions of a virtual base class from a constructor, especially in
calls to dynamic_cast. This unfortunately affects gtkmm on win32. As a
result, some gtkmm programs, built on win32 using the MSVC.Net 2003
compiler, might crash with a "Access violation - no RTTI data!" message.
The gtkmm and MSVC developers are aware of this bug, which should/will
hopefully be fixed in Visual Studio 2005 beta 2. For more details see
this bugzilla entry and references therein.

You will just have to use a C style cast like:

OGRGeometry *poGeometry ....  // not null 
... 
switch (poGeometry->getGeometryType()) 
{ 
    ..... 
     case wkbPolygon: 
         MyFunc( (OGRPolygon*)poGeometry); 
         .... 
} 

MyFunc(OGRPolygon  *poPolygon) 
{ 
..... 
}

Martin

-----Original Message-----
From: gdal-dev-bounces at lists.maptools.org
[mailto:gdal-dev-bounces at lists.maptools.org] On Behalf Of EllenD
Sent: Tuesday, April 11, 2006 5:33 AM
To: gdal-dev at lists.maptools.org
Subject: [Gdal-dev] RE: need RTTI for OGR (Windows)


Martin,

I did set the RTTI property for my Visual Studio project, but that
didn't
work. I compiled GDAL command line and added the /GR option, but that
also
didn't solve the problem.  What you state in your reply to Frank's
reply,
seems logic and I also thought it was the case, but unfortunately it
won't
work.  I still have no idee on how I can solve my problem.

Ellen

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