From: Bob X <bobx@...>
Date: 2003-06-11T05:27:32+09:00
Subject: Metakit [ first swipe ]

From Mr. Fletcher:

====
I have made quite a lot of progress with binding Metakit, using

SWIG (http://www.swig.org/). All that this needs, once you have

SWIG, is to make a local copy of the Metakit header and run this

SWIG file

-----------------------

/* File : mk4.i */

%module mk4

%{

#include "mk4.h"

%}

/* First attempt at mk4 interface */

%include "mk4.h"

----------------------

Here is a translation of part of the Metakit demo. Notice

(1) that all the Metakit classes have an initial capital letter. This is

a requirement of Ruby and the translation is done by SWIG, which

also gives a warning.

(2) In this simple version some functionality is lost, in particular [ ]

operations on the view. Some of this can be restored by adding

things to the SWIG interface. I was concerned to get something

operational.

(3) I have only tried this on Linux using SWIG 1.3.16 and gcc 3.2.



----------------------------

# test file for ruby interface for Metakit

# load the package, which must have a lower case name.

require 'mk4'

include Mk4

puts "A first test of Metakit running via Ruby"

puts "John Fletcher June 2003 J.P.Fletcher@aston.ac.uk"

puts "This is intended as a translation of demo.cpp"

pName = C4_StringProp.new("name")

pCountry = C4_StringProp.new("country")

storage = C4_Storage.new("myfile.dat",1)

vAddress = storage.GetAs("address[name:S,country:S]")

row = C4_Row.new()

# These do not translate directly

#pName (row) = "John Williams"

#pCountry (row) = "UK"

#row = pName["John Williams"]

#row.pName = "John Williams"

# This has to be used instead.

pName.Set(row,"John Williams")

pCountry.Set(row,"UK")

vAddress.Add(row)

pName.Set(row,"Paco Pena")

pCountry.Set(row,"Spain")

vAddress.Add(row)

# This has added two records.

# Here is how to get data back again

s1 = pName.Get(vAddress.GetAt(1))

s2 = pCountry.Get(vAddress.GetAt(1))

puts "The country of #{s1} is #{s2}"

storage.Commit()

-------------------

Example output:

A first test of Metakit running via Ruby

John Fletcher June 2003 J.P.Fletcher@aston.ac.uk

This is intended as a translation of demo.cpp

The country of Paco Pena is Spain

====

If anyone can help him I am sure he would appreciate it very much.  : )