Check for unvalid object (null, not set...?)

samscore's picture
samscore
Thu, 08/27/2009 - 01:59
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Other usage issues

Hi,
does anybody know how i can test if an TopoDs Shape, in this case a vertex is set?

TopoDS_Vertex vertex;
gp_Pnt casPoint = BRep_Tool::Pnt(vertex)

The vertex is not null but invalid - how can I check this before going on...?
Thanks Simon

haowei's picture
haowei
Thu, 08/27/2009 - 06:00

TopoDS_Vertex vertex;
if(!vertex.IsNull())
gp_Pnt casPoint = BRep_Tool::Pnt(vertex);

samscore's picture
samscore
Thu, 08/27/2009 - 09:07

Thanks!

and how can I handle the exception if I dont code the '!IsNull' case? I read something about exception handling in the manual but I dont find it anymore... perhaps somebody can tell me where to find it...

Regards
Simon

samscore's picture
samscore
Thu, 08/27/2009 - 09:12

ok, I found it once again in the foundation classes pdf-file at page 29 :-)