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    <p>Here's my guess, based on the C type signature and the <a href="http://www.astro.com/swisseph/swephprg.htm#_Toc335137304" rel="nofollow">function documentation</a> I found. It compiles, but you'll have to tell me if it actually works since I don't have the <code>swedll32.dll</code> assembly. Also, my code doesn't require the F# Powerpack assembly.</p> <p>EDIT: Just read the comments under @kvb's answer -- he suggested the same thing I included in my code, which is the <code>[&lt;MarshalAs(...)&gt;]</code> attribute with the <code>SizeConst</code> property set. I also added <code>[&lt;Out&gt;]</code>, because the last two parameters are used as return values; IIRC, it also affects marshalling behavior.</p> <p>EDIT 2: Removed the <code>ExactSpelling = true</code> from the <code>MarshalAs</code> attribute, as per @wolfgang's report.</p> <pre><code>[&lt;DllImport(@"swedll32.dll", CharSet = CharSet.Ansi, EntryPoint = "swe_calc_ut")&gt;] extern int32 swe_calc_ut ( float tjd_ut, int32 ipl, int32 flag, [&lt;Out; MarshalAs(UnmanagedType.LPArray, SizeConst = 6)&gt;] float[] xx, [&lt;Out; MarshalAs(UnmanagedType.LPStr, SizeConst = 256)&gt;] System.Text.StringBuilder serr) // Wrapper function for swe_calc_ut let swe_calc_ut_wrapper (tjd_ut, ipl, flag) = let positions = Array.zeroCreate 6 let errorSB = System.Text.StringBuilder (256) let result = swe_calc_ut (tjd_ut, ipl, flag, positions, errorSB) if result &lt; 0 then // Error Choice2Of2 (result, errorSB.ToString ()) else Choice1Of2 positions </code></pre>
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    1. COSeems like sorcery. 4 am. Will try.
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    2. COWohoo! Yahoo! It compiles! You guys are awesome! Is there a "buy you a beer" button? :-) (Just had to remove the "Exact spelling" option.) Will send this to the makers of Swiss ephemeris to spare coming generations troubles and woes ;-) Happy theologian from Switzerland hunting for "Star of Bethlehem" combinations for his habilitation thesis
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