MathGroup Archive: September 2003 [00183]

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package functions in mathlink

To: mathgroup at smc.vnet.net
Subject: [mg43571] package functions in mathlink
From: theoryboy at my-deja.com (Peter Saffrey)
Date: Sun, 21 Sep 2003 05:42:12 -0400 (EDT)
Sender: owner-wri-mathgroup at wolfram.com

I have defined a package which I would then like to interact with via
mathlink. The relevant part of the package simply looks like this:

simpfun[x_, y_] := x - y

I open the package by using 

MLPutFunction(link, "EnterTextPacket", 1);
MLPutString(link, "<</home/pzs/workspace/mathematica/testpackage.m");
MLEndPacket(link);

and then call it using

MLPutFunction(link, "EvaluatePacket", 1);
MLPutFunction(link, "simpfun", 2);
MLPutInteger(link, 4);
MLPutInteger(link, 2);
MLEndPacket(link);

But rather than getting back an integer answer, I am returned an
expression that contains the complete function call. I feel sure I
must be using the wrong packet passing function, but EvaluatePacket
seems appropriate. What am I doing wrong?

Peter

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