Re: Segmentation Fault in Creating NodeItems

[Darren Schreiber]

Paul thanks for the explanation about only putting those methods from the
creating phase inside.  Like so many things, it seems obvious now that I
know it.

Unfortunately, I moved the those commands and still got the same error.

Any other ideas out there?

BTW, the canvas appears on the screen w/o incident.

        Darren


>Darren Schreiber wrote:
>>
>> 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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_____________________________________________

                 Darren Schreiber
                  Attorney at Law
                 Graduate Student
             Political Science, UCLA
                address@hidden

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   Swarm-Support is for discussion of the technical details of the day
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   with "help" in the body of the message.