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    <p>You can find a more complete answer about the difference between <code>SafeHandle</code> and <code>IntPtr</code> here: <a href="https://stackoverflow.com/questions/526661/intptr-safehandle-and-handleref-explained">IntPtr, SafeHandle and HandleRef - Explained</a></p> <p>However, to summarize, <code>IntPtr</code> should be used where the argument is actually a <em>machine-size pointer</em> - <code>SafeHandle</code> should be used where the argument is actually a Win32 handle. These types are not generally interchangeable; the size of <code>IntPtr</code> will vary on different architectures (32 bits on x86 and 64 bits on x64 and amd64). NOTE: Under the covers I believe <code>SafeHandle</code> uses an <code>IntPtr</code> as well).</p> <p>Also, unlike <code>IntPtr</code>, <code>SafeHandle</code> actually performs disposal of resources when a type is garbage collected. This ensures that system resources are not leaked when your program is running (although you should <code>Dispose()</code> of <code>SafeHandle</code> instances early when possible). Note that <code>SafeHandle</code> is actually abstract because there many different kinds of handles which require different approaches for proper disposal and handling.</p> <p>In your specific case, you need to look at the documentation for the DLL you are calling. If it is a Win32 DLL, there may already be a SafeHandle type for it. If it's a third-party DLL, then you can roll your own SafeHandle implementation - assuming that in addition to <code>Initialize()</code> there is some version of <code>Release()</code> (or equivalent).</p> <p>Some additional interesting tidbits about IntPtr vs SafeHandle can be found at:</p> <p><a href="http://msdn.microsoft.com/en-us/library/ms182294(v=vs.80).aspx" rel="nofollow noreferrer">Use SafeHandle to encapsulate native resources</a></p> <p><a href="http://msdn.microsoft.com/en-us/library/system.runtime.interopservices.safehandle.aspx" rel="nofollow noreferrer">SafeHandle Class Reference</a></p> <p><a href="http://msdn.microsoft.com/en-us/library/fh21e17c.aspx" rel="nofollow noreferrer">SafeHandles and Critical Finalization</a></p>
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    1. POCan I use SafeHandle instead of IntPtr?
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    1. COSurely `IntPtr` is 64 bits not 65? I made the edit--please revert and explain more (I'm prepared for this to be my "learn something new every day moment).
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    2. COWell, creating my own SafeHandle implentation as I said is no big deal, there are plenty examples on it. What I would like to know is if I can use SafeHandle and IntPtr interchangeable, thus could I do: `static extern bool Initialize([In] string name, out SafeHandle)` instead of the current `static extern bool Initialize([In] string name, out IntPtr)`?
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    3. CO@sblom: Nope, that was just a typo on my part. Thanks for catching it.
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