Re: real-time nam animation

[Haobo Yu <haoboy@ISI.EDU>]

This is related to how nam parses its parameters and how it handles trace
file name. Nam has the internal support for streams, what lacks is the
interface. 

- Haobo

On Fri, 10 Sep 1999, Lori Flynn wrote:

> Hi,
> 
> I've been looking through the newest nam version (the 'snapshot') to try
> to understand how to invoke a nam animation which will play **while** a
> ns2 simulation runs. (The new version has streams, which allow nam to read
> from stdin.  See nam_stream.cc for the code I've been looking at.)
> >From the code I've looked at, it appears to me that the correct way to
> start nam reading from stdin is as following:
> 
> exec nam - | $ns namtrace-all stdout
> 
> 
> This doesn't work.  Anybody know what does?  I looked in the 'ex'
> directory for an example, but didn't find any.
> 
> I expect this to work, if I can find the correct function calls.
> This version of nam creates a .nam file which plays a correct animation
> for the code, if I put the 'exec nam ' line in the 'finish' function,
> which executes after the simulation has ended.  
> 
> Thanks for any pointers,
> Lori
> 
> 
> --------------------------------------------------------------------------
> Following is part of a function from file nam_stream.cc, which indicates
> that the filename expected is "-.nam" 
> 
> NamStream *
> NamStream::open(const char *fn)
> {
>         if (strcmp(fn, "-") == 0 || strcmp(fn, "-.nam") == 0) {  // XXX
> #if 1
>                 return new NamStreamPipe(fn);
> #else
>                 fprintf(stderr, "nam does not currently support reading
> from stdin.\n");
>                 return NULL;
> #endif
>         };
> 
> 
>