Re: BLT Problems

[Todd Allen]

I think that I've found some more clues to the problem.  First of all, I
noticed that thought the BLTVector error is the only message that shows
up on the err.log file when I invoke heatbugs with "./heatbugs >
err.log", if I watch the xterm windows, I get a whole string of errors
inlcuding messages like:

        (tcl -eval:) invalid command name "busy"
                while executing
        "unknown_pre_tclObjc $name $args"

Also, if entirely remove BLT by deleting /usr/local/blt and all of its
subdirectories I get exactly the same errors.

Does this mean that swarm is not finding some of the libraries?  I used
that standard ./configure and make scripts for all of the packages so
everything should be in the standard places.  Any idea what's up here?

Todd

glen e. p. ropella wrote:
> 
> Todd,
> 
> I'm not sure if this might be why or not.  I've been using Slackware
> for a while (with the 1.2.13 and with the 2.0.0 kernels with gcc
> 2.7.2, etcetc) and I've never seen this.
> 
> Anyway, what I think is happening is that heatbugs has a call to the
> "-step" method on an ActiveGraph, which then calls the "-addX:
> (double) x Y: (double) y" method on a GraphElement in BLTGraph, which
> then calls the "-append" method on a BLTVector.
> 
> The call to addX:Y: (in ActiveGraph.m) looks like:
> 
>   [element addX: getCurrentTime() Y: [self doubleDynamicCallOn: dataFeed]];
> 
> Now, getCurrentTime() probably returns an unsigned integer because
> it's defined in activity.h as:
> 
>    typedef unsigned   timeval_t;        // type for time values
> 
> This means that the first arguement for addX is the wrong type.
> So, you might try changing the addX call to:
> 
>   [element addX: (double) getCurrentTime() Y: [self doubleDynamicCallOn: 
> dataFeed]];
> 
> And see if the problem goes away.  I doubt it will.  But, who knows.
> The reason I doubt it is because I have no idea why it would balk at
> the append method on BLTVector instead of higher up in the stack.  If
> presented with the circumstance without the error message, I would say
> that it would fail to find the "-addX: (unsigned) x Y: (double) y"
> method and the error message would say:
> 
>    GraphElement does not respond to method addX
> 
> Anyway, give it a shot and let me know how it goes.
> 
> glen
> 
> > I have been trying to get swarm working for weeks.  I think I'm close to
> > having it working, but it's still not quite right.
> >
> > I am runing Red Hat 3.0.3 Linux kernel 1.2.13 on a Pentium Pro 200
> > machine.
> >
> > I have installed all of the required libraries.  There did not appear to
> > be any errors during the install process. The swarm libraries and the
> > sample apps also appeared to compile without incident.  The problems
> > occur when I run the sample apps.  For example, when I run heatbugs, the
> > message,
> >
> >       BLTVector does not respond to method append
> >
> > appears repeatedly in the xterm window from which I executed heatbugs,
> > and the 'happiness of bugs vs. time' graph is not displayed when the go
> > button is pressed.  On the up side, the heatbugs seem to be scampering
> > around properly in their window.
> >
> > What am I doing wrong?  I have been through the entire install process
> > no fewer than five times with exactly the same result.
> >
> > Thanks,
> >
> >
> > Todd Allen