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

[Ken Cline]

What does the `setStatus:' method look like?


On Thu, 28 Aug 1997 address@hidden wrote:

> 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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_________________________________________________________
Ken Cline                             address@hidden
SAIC                                 VOICE (410) 571-0413
Annapolis, MD                          FAX (301) 261-8427


                  ==================================
   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.
                  ==================================