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POHow do I convert to type SWIGTYPE_p_void in SWIG generated Java bindings?
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copied!<p>I am developing some SWIG-generated Java bindings for a C library. The library contains functions that take parameters of type <code>void *</code>. On the C side these would typically be passed as a pointer to an array of type <code>float</code> or <code>int</code> cast to <code>void *</code>. In the generated Java bindings, this results in methods that take parameters of type <code>SWIGTYPE_p_void</code>.</p> <p>What is the best way to construct an array of floats/ints in the Java bindings so that they can be passed as type <code>SWIGTYPE_p_void</code> to these methods?</p> <p>At the moment I am defining a helper function in my example.i file:</p> <pre class="lang-c prettyprint-override"><code>void *floata_to_voidp(float f[]) { return (void *)f; } </code></pre> <p>And then on the Java side doing something like this:</p> <pre class="lang-java prettyprint-override"><code>float foo[] = new float[2]; SWIGTYPE_p_void av = null; // do something with foo av = example.floata_to_voidp(foo); example.myfunction(av); </code></pre> <p>This seems rather ugly, especially as I would also need an <code>inta_to_voidp()</code> etc in my SWIG interface file for each type conversion I want to support.</p> <p>Is there a way to do this without helper functions and involving less extra code on the Java side to convert data types?</p> <p><strong>UPDATE (17/6/12):</strong> to give additional detail to the question: what I'm trying to do is take a set of C functions, with prototype <code>int foo(const float *data, int N, const void *argv, float *result)</code> and map them to methods on the Java side where an array of arbitrary type can be passed in as <code>argv</code>. Note that <code>argv</code> is <code>const void *</code> and not <code>void *</code>.</p>

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