I worked for days, and still no resolution, so...

[bleydorf]

All,
I have an error, I've learned and used gdb and am closer to a solution,
but still can't nail it. I know theres been some complains about my
frequent asking of questions, so, I spent lots of time trying to figure
it out first, I've spent over 20 hours trying to find the error.

When I run the program in gdb, and do a backtrace, after it bombs (with
segmentation fault),
I get this as the "cause"

#0 0x807c1da objc_msg_lookup

#1 ????????? -[Problem checkForSolution] .... Problem.m 177.

(and 12 others which are internal to objc and/or swarm.)

Line 177 in Problem.m is :
foundStatus = [foundObject getStatusZZ];

I did a breakpoint on this line, where I set it up like this:
break 177 if foundStatus > 4   //4 being "full" the highest of possible
status value.

And it stops and each time I "print foundStatus" it is a number up to
10788.
This seems wrong to me, and I cant figure out why it get incremented up,
usually by around 60 to 200 each time.

Any ideas?

Brad.


MORE DETAILS FOLLOW, IF YOU NEED THEM...
(All relevant methods, and the checkForSolution methods follow).

I had to name getStatusZZ that, since there is already a method internal
to the core libraries called "getStatus".
getStatusZZ is in both types of agents Problems, and solutions, it is:

-(StatusType) getStatusZZ {
   return status;
}

//this is a action in ProblemModel.m

[modelActions createActionForEach: problemList message:
M(checkForSolution)];

//this is defined in Solution.h which is imported into Problem.h

deftype enum {free, owned, empty, partial, full} StatusType;

-checkForSolution {
  int indexX, indexY;              // used for loop processing.
  id foundObject;                // a pointer to object used to check
                                   // if consumer or solution.  
  StatusType foundStatus;          // status of the found object.
  int foundNumber;                 // varible to hold the currently
found 
                                   // Solutions Assigned number.  
 

//if its status = full, then it doesnt need to run this method since its
has found its
//ideal solution.
 
  if (status != full) {

// checks the 9 cells near it, including the one its in.  I've tried to
skip 
//over its own cell, but the problem still exists.

    for (indexX = x - 1; indexX <= x + 1; indexX++) {
      for (indexY = y - 1; indexY <= y + 1; indexY++) {

//it assigns that object to a foundObject.

        foundObject = [world getObjectAtX: indexX Y: indexY];

//if its not nil, but either a problem or a solution, CAN IT BE ANYTHING
ELSE?

        if (foundObject != nil) {

//This is the problem line, its supposed to get the status from the 
// foundObject.

           foundStatus = [foundObject getStatusZZ];

//If its status is free (and thusly it is a solution).

           if (foundStatus == free) {

//it checks it assigned number.  each solution has a "assigned number",
while the //problems have an ideal number.  Both assigned randomly,
between a Min and Max.
  
            foundNumber = [foundObject getAssignedNumber];

//checks to see if its number is bigger than its current number but not
more than its //ideal number.

              if ((foundNumber > currentNumber) &&
                  (foundNumber <= idealNumber)) {

//if the problems current number is 0, then its empty and should attach
to this //solution.
                if (currentNumber == 0)

//see below for attach and detach.

                   [self attach: foundObject];
                else {
                   [self detach];
                   [self attach: foundObject];
                }
              }
           }
        }
      }
    }
  }
  return self;
}

//oldSolution is a global varible which is a pointer to a solution

-attach: (Solution *) s {
   oldSolution = s;
   currentNumber = [s getAssignedNumber];
   [oldSolution setStatus: owned];
   if (currentNumber == idealNumber)
       [self setStatus: full];
   else
       [self setStatus: partial];
   return self;
}

//fee the oldsolution, and change my status to empty.

-detach {
   [oldSolution setStatus: free];
   [self setStatus: empty];
   return self;
}

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