The great merge

git-svn-id: https://swig.svn.sourceforge.net/svnroot/swig/trunk@4141 626c5289-ae23-0410-ae9c-e8d60b6d4f22
This commit is contained in:
Dave Beazley 2002-11-30 22:01:28 +00:00
commit 516036631c
1508 changed files with 125983 additions and 44037 deletions

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# see top-level Makefile.in
simple

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TOP = ../..
SWIG = $(TOP)/../swig
SRCS = example.c
TARGET = example
INTERFACE = example.i
MLFILE = example.ml
PROGFILE = example_prog.ml
OBJS = example.o
all:: static
static::
$(MAKE) -f $(TOP)/Makefile SRCS='$(SRCS)' SWIG='$(SWIG)' \
TARGET='$(TARGET)' INTERFACE='$(INTERFACE)' MLFILE='$(MLFILE)' \
PROGFILE='$(PROGFILE)' OBJS='$(OBJS)' \
ocaml_static
clean::
$(MAKE) -f $(TOP)/Makefile MLFILE='$(MLFILE)' ocaml_clean
check: all

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/* 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;
}

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/* File : example.i */
%module example
extern int gcd(int x, int y);
extern double Foo;

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(* example_prog.ml *)
open Example
(* Call our gcd() function *)
exception NoReturn
let single_int x =
match x with C_int a -> a | _ -> raise NoReturn
let get_float x =
match x with C_float f -> f | C_double f -> f | _ -> raise NoReturn
let x = 42
let y = 105
let g = single_int (_gcd (C_list [ C_int x ; C_int y ]))
let _ = Printf.printf "The gcd of %d and %d is %d\n" x y g
(* Manipulate the Foo global variable *)
(* Output its current value *)
let _ = Printf.printf "Foo = %f\n" (get_float (_Foo C_void))
(* Change its value *)
let _ = _Foo (C_float 3.1415926)
(* See if the change took effect *)
let _ = Printf.printf "Foo = %f\n" (get_float (_Foo C_void))

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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>