Re: Segmentation Fault in Creating NodeItems

[Joseph P. Wetstein]

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> Darren Schreiber wrote:
> > 
> > <x-rich>
> > 
> > When I build the Agent in the modelSwarm, I am having the Agent create a
> > node for them on the canvas.  Using the following code:
> > 
> > -setNode: (id) aCanvas {
> > 
> >   agentNode = [OvalNodeItem createBegin: [self getZone]];
> > 
> >   [agentNode setCanvas: aCanvas];
> > 
> >   [agentNode setX: 50 Y: 50];
> > 
> >   [agentNode setString: (const char*) agentID];
> > 
> >   //[agentNode setTargetID: self];
> > 
> >   agentNode=[agentNode createEnd];
> > 
> >   return self;
> > 
> > }
> > 
> > It compiles fine, but I get the following error:
> > 
> > Program received signal SIGSEGV, Segmentation fault.
> > 
> > 0x41e53d in _i_NodeItem__createPaddedText (self=0x4964188, _cmd=0x4b91e8)
> > 
> >     at /src/Swarm/swarm/src/tkobjc/NodeItem.m:150
> > 
> > /src/Swarm/swarm/src/tkobjc/NodeItem.m:150: No such file or directory.
> > 
> > (gdb)
> > 
> > When I step through the problem using a break, the segmentation fault
> > occurs at the line agentNode=[agentNode createEnd];
> 
> I think the problem is that you have some methods from the "using"
> section inside your createBegin/End brackets.
> 
> Only commands that show in the docs in the creating phase can go between
> those two.  Absolutely for certain you don't want setX:Y:, setString: in
> there.  
> 
> Move those after createEnd and I bet it works OK
> 
> -- 
> Paul E. Johnson                               email: address@hidden
> Dept. of Political Science                    
> http://lark.cc.ukans.edu/~pauljohn
> University of Kansas                          Office: (785) 864-9086
> Lawrence, Kansas 66045                        FAX: (785) 864-5700
> 
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-- 
 Joseph P. Wetstein, P.E.         
 address@hidden                 
 (707) 202-0600 fax
 PP/ASEL & KA3VJY [Tech+]


                  ==================================
   Swarm-Support is for discussion of the technical details of the day
   to day usage of Swarm.  For list administration needs (esp.
   [un]subscribing), please send a message to <address@hidden>
   with "help" in the body of the message.