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From: peirce@lll-crg.llnl.gov (Michael Peirce)
Newsgroups: comp.sys.mac
Subject: AppleTalk programming question
Message-ID: <1292@lll-lcc.aRpA>
Date: Sat, 14-Nov-87 18:32:16 EST
Article-I.D.: lll-lcc.1292
Posted: Sat Nov 14 18:32:16 1987
Date-Received: Sun, 15-Nov-87 20:18:47 EST
Sender: usenet@lll-lcc.aRpA
Reply-To: peirce@lll-crg.llnl.gov.UUCP (Michael Peirce)
Lines: 77

'
    I've been messing around with AppleTalk, or rather, trying to.
    
    I can get things to work: once.  The first time I run the program
    things are fine and act as they should, but the second time BOMB!
    
    If anyone can suggest something, I'd really appreciate it.  Below is
    a simple program that exhibits this behavior...
    
    -- michael
-------------------------------------------------------------------------------
#include "stdio.h"
#include "Appletalk.h"

/*
 *		LightSpeed C project contains the following libraries:
 *			AppleTalk.lib
 *			MacTraps
 *			stdio
 *			test.at.c
 *
 *		You also need a resource file containing the 'atpl' resource found in
 *		the file :LightSpeed C:Mac Libraries:Resource Files:ATalk/ABPackage
 *		(this seems to contain the glue from Think for AppleTalk.
 *
 *
 *				Run it once and it seems to work just fine,
 *				but run it a second time and KAPLOWEE!!!
 *
 */

RetransType	retrans = { 2, 2 };
EntityName	who		= { "\p=", "\p=", "\p*"};
ABRecHandle	myABRec;
OSErr		stat;
char		buff[255];

main ()
{

	/*
	 *	Check to see if the drivers are open.
	 */

	printf("IsMMPOpen %d\n",IsMPPOpen());
	printf("IsATPOpen %d\n",IsATPOpen());

	/*
	 *	Open up the AppleTalk drivers (if already open, that's OK)
	 */
	 
	stat = MPPOpen();

	printf("stat from MPPOpen was %d\n",stat);
	
	/*
	 *	Ask the Name Binding Protocal who's out there...
	 */
	 
	myABRec = (ABRecHandle)NewHandle(nbpSize);

	(**myABRec).nbpProto.nbpEntityPtr		= &who;
	(**myABRec).nbpProto.nbpBufPtr			= buff;
	(**myABRec).nbpProto.nbpBufSize			= 255;
	(**myABRec).nbpProto.nbpDataField		= 10;
	(**myABRec).nbpProto.nbpRetransmitInfo	= retrans;
	
	stat = NBPLookup(myABRec,/* ASYNC => */FALSE);
	
	printf("stat from NBPLookUp was %d   count = %d\n",stat,(**myABRec).nbpProto.nb
pDataField);


	stat = MPPClose();

	printf("stat from MPPClose was %d\n",stat);

}