Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!shogun!mike
From: mike@shogun.cc.umich.edu (Michael Nowak)
Newsgroups: comp.sys.mac.programmer
Subject: Using the new AppleTalk interface from Lightspeed C 3.01
Message-ID: <894@mailrus.cc.umich.edu>
Date: 29 Jan 89 17:03:25 GMT
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Reply-To: mike@shogun.cc.umich.edu ()
Organization: University of Michigan Computing Center, Ann Arbor
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UUCP-Path: mailrus!shogun!mike

I originally posted this in comp.sys.mac...

I'm trying to experiment with AppleTalk with my shiny new Lightspeed C
compiler and I'm having trouble using the new "preferred interface" to
AppleTalk listed in Volume V.  Specifically, I'm trying to write some
code to register an entity on the network, and then look for entities
of that type.  I can't get it to work - it usually crashes big time
with a call to PLookupName().

Let me state specifically what I am doing, in hopes that someone will
see the error of my ways.  Here's what the call to PLookupName() looks
like:

        search_name.objStr[0] = 0x01;
        search_name.objStr[1] = '=';
        search_name.typeStr[0] = 0x01;
        search_name.typeStr[1] = '=';
        search_name.zoneStr[0] = 0x01;
        search_name.zoneStr[1] = '*';

        mpp_pb_ptr = (MPPPBptr)NewPtr(sizeof(MPPParamBlock));
        if (mpp_pb_ptr == (MPPPBptr)0) {
                err_code = app_memoryErr;
                goto nomppptr;
        }

        mpp_pb_ptr->ioCompletion = (ProcPtr)0;
        mpp_pb_ptr->NBPentityPtr = (Ptr)&search_name;
        mpp_pb_ptr->NBPretBuffPtr = (Ptr)entity_buffer;
        mpp_pb_ptr->NBPretBuffSize = 1080;
        mpp_pb_ptr->NBPmaxToGet = 10;
        mpp_pb_ptr->NBPinterval = 8;
        mpp_pb_ptr->NBPcount = 3;

        err_code = PLookupName(mpp_pb_ptr, false);

entity_buffer is defined as char entity_buffer[1080].  I originally
tried using NBPSetEntity to set up search_name but have used this
approach to cut down on places where I could mess up.  The code crashes
in the PLookupName call, with an odd address exception at 0x4345a0.

Does anyone have any source code which might do such a thing that I can
use as an example?  Or if someone can point me to an ftp server which
might have such an example, I'd appreciate that too.  I looked at sumex
but only found an example using the "alternate" or old interface.  If
you can send me mail, that'd be great.

Any advice would be appreciated.
 -----------------------------------------------------------------------------
 Michael Nowak                                          ...mailrus!shogun!mike
 Workstation Consultant                               mike@shogun.cc.umich.edu
 U of M Computing Center User Services              Mike_Nowak@um.cc.umich.edu

    ...working for but in no way representing the University of Michigan...