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copied!<p>I just googled for <code>EdsCreateMemoryStream</code> and <a href="http://www.google.co.uk/url?sa=t&source=web&ct=res&cd=3&url=http%3A%2F%2Ffiledb.experts-exchange.com%2Fincoming%2F2008%2F10_w44%2F72271%2Ftest.txt&ei=o2NQSsCpJKLMjAetqbhE&usg=AFQjCNEpLP7pv6rF9-Uv99SMHq3NwsBvgA&sig2=fhFU1F44uhVecWVrrzLsXA" rel="nofollow noreferrer">found a sample</a> in which there's another call to get the pointer from the "memory stream".</p> <pre><code>IntPtr pointerToBytes; EDSDKLib.EDSDK.EdsGetPointer(stream, out pointerToBytes); </code></pre> <p>You can then use <code>pointerToBytes</code> as the source to read from in <code>Marshal.Copy</code>.</p> <p>So I'd guess that what you're currently doing is attempting to copy some large number of bytes starting from the address of some small control structure pointed to by <code>stream</code>, and hence you're reading past the end of that structure.</p> <p><strong>Edit:</strong> By the way, you're code looks as if someone's told you that you should only have one return statement! That's old advice relating to languages like Fortran and C; it doesn't make sense in modern languages. Your code would be clearer (at least in this case) if you immediately returned the error code every time you got a failure:</p> <pre><code>if ((err = EDSDK.EdsBlahBlah(...)) != EDSDK.EDS_ERR_OK) return err; </code></pre> <p>(Better yet, throw a specific exception class containing the error code and a string explaining what you were trying to do.)</p>

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