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<title>Simple Example - libffi</title>
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<h3 class="section">2.2 Simple Example</h3>

<p>Here is a trivial example that calls <code>puts</code> a few times.

<pre class="example">     #include &lt;stdio.h&gt;
     #include &lt;ffi.h&gt;
     
     int main()
     {
       ffi_cif cif;
       ffi_type *args[1];
       void *values[1];
       char *s;
       int rc;
     
       /* Initialize the argument info vectors */
       args[0] = &amp;ffi_type_pointer;
       values[0] = &amp;s;
     
       /* Initialize the cif */
       if (ffi_prep_cif(&amp;cif, FFI_DEFAULT_ABI, 1,
     		       &amp;ffi_type_uint, args) == FFI_OK)
         {
           s = "Hello World!";
           ffi_call(&amp;cif, puts, &amp;rc, values);
           /* rc now holds the result of the call to puts */
     
           /* values holds a pointer to the function's arg, so to
              call puts() again all we need to do is change the
              value of s */
           s = "This is cool!";
           ffi_call(&amp;cif, puts, &amp;rc, values);
         }
     
       return 0;
     }
</pre>
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