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Updated some examples

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git-svn-id: https://swig.svn.sourceforge.net/svnroot/swig/trunk/SWIG@490 626c5289-ae23-0410-ae9c-e8d60b6d4f22
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Dave Beazley 2000-06-17 21:41:01 +00:00
commit b3e124ac21
22 changed files with 745 additions and 96 deletions
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1
Examples/python/simple/README
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Simple example from the users manual

27
Examples/python/simple/example.c
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/* Simple example from documentation */
/* File : example.c */
#include <time.h>
/* A global variable */
double Foo = 3.0;
double My_variable = 3.0;
int fact(int n) {
if (n <= 1) return 1;
else return n*fact(n-1);
/* Compute the greatest common divisor of positive integers */
int gcd(int x, int y) {
int g;
g = y;
while (x > 0) {
g = x;
x = y % x;
y = g;
}
return g;
}
int mod(int n, int m) {
return (n % m);
}
char *get_time() {
long ltime;
time(&ltime);
return ctime(&ltime);
}

7
Examples/python/simple/example.i
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/* File : example.i */
%module example
extern double My_variable;
extern int fact(int);
extern int mod(int n, int m);
extern char *get_time();
extern int gcd(int x, int y);
extern double Foo;

36
Examples/python/simple/example.py
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#!/home/sci/local/bin/python
#
# Python test script. This also illustrates the use of get/set
# for C variables.
from example import *
print get_time()
print "My Variable = ", cvar.My_variable
for i in range(0,14):
n = fact(i)
print i, "factorial is ", n
for i in range(1,250):
for j in range(1,250):
n = mod(i,j)
cvar.My_variable = cvar.My_variable + n
print "My_variable = ", cvar.My_variable
# file: example.py
import example
# Call our gcd() function
x = 42
y = 105
g = example.gcd(x,y)
print "The gcd of %d and %d is %d" % (x,y,g)
# Manipulate the Foo global variable
# Output its current value
print "Foo = ", example.cvar.Foo
# Change its value
example.cvar.Foo = 3.1415926
# See if the change took effect
print "Foo = ", example.cvar.Foo

99
Examples/python/simple/index.html Normal file
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<html>
<head>
<title>SWIG:Examples:python:simple</title>
</head>
<body bgcolor="#ffffff">
<tt>SWIG/Examples/python/simple/</tt>
<hr>
<H2>Simple Python Example</H2>
<tt>$Header$</tt><br>
<p>
This example illustrates how you can hook Python to a very simple C program containing
a function and a global variable.
<h2>The C Code</h2>
Suppose you have the following C code:
<blockquote>
<pre>
/* File : example.c */
/* A global variable */
double Foo = 3.0;
/* Compute the greatest common divisor of positive integers */
int gcd(int x, int y) {
int g;
g = y;
while (x > 0) {
g = x;
x = y % x;
y = g;
}
return g;
}
</pre>
</blockquote>
<h2>The SWIG interface</h2>
Here is a simple SWIG interface file:
<blockquote>
<pre>
/* File: example.i */
%module example
extern int gcd(int x, int y);
extern double Foo;
</pre>
</blockquote>
<h2>Compilation</h2>
<ol>
<li><tt>swig -python <a href="example.i">example.i</a></tt>
<p>
<li>Compile <tt><a href="example_wrap.c">example_wrap.c</a></tt> and <tt><a href="example.c">example.c</a></tt>
to create the extension <tt>examplemodule.so</tt>.
</ol>
<h2>Using the extension</h2>
Click <a href="example.py">here</a> to see a script that calls our C functions from Python.
<h2>Key points</h2>
<ul>
<li>Use the <tt>import</tt> statement to load your extension module from Python. For example:
<blockquote>
<pre>
import example
</pre>
</blockquote>
<li>C functions work just like Python functions. For example:
<blockquote>
<pre>
g = example.gcd(42,105)
</pre>
</blockquote>
<li>C global variables are accessed through a special variable called 'cvar'. For example:
<blockquote>
<pre>
a = example.cvar.Foo
</pre>
</blockquote>
</ul>
<hr>
</body>
</html>