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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<!-- Hand-written HTML -->
<html>
<head>
<title>SWIG and MzScheme</title>
<link rel="stylesheet" type="text/css" href="style.css">
</head>
<body bgcolor="#ffffff">
<H1><a name="Mzscheme"></a>26 SWIG and MzScheme</H1>
<!-- INDEX -->
<div class="sectiontoc">
<ul>
<li><a href="#MzScheme_nn2">Creating native MzScheme structures</a>
</ul>
</div>
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<p>
This section contains information on SWIG's support of MzScheme.
<H2><a name="MzScheme_nn2"></a>26.1 Creating native MzScheme structures</H2>
<p>
Example interface file:
</p>
<div class="code">
<pre>
/* define a macro for the struct creation */
%define handle_ptr(TYPE,NAME)
%typemap(argout) TYPE *NAME{
Scheme_Object *o = SWIG_NewStructFromPtr($1, $*1_mangle);
SWIG_APPEND_VALUE(o);
}
%typemap(in,numinputs=0) TYPE *NAME (TYPE temp) {
$1 = &temp;
}
%enddef
/* setup the typemaps for the pointer to an output parameter cntrs */
handle_ptr(struct diag_cntrs, cntrs);
</pre>
</div>
<p>
Then in scheme, you can use regular struct access procedures like
</p>
<div class="code">
<pre>
; suppose a function created a struct foo as
; (define foo (make-diag-cntrs (#x1 #x2 #x3) (make-inspector))
; Then you can do
(format "0x~x" (diag-cntrs-field1 foo))
(format "0x~x" (diag-cntrs-field2 foo))
;etc...
</pre>
</div>
<p>
That's pretty much it. It works with nested structs as well.
</p>
</body>
</html>
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