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copied!<p>First you may try <code>dynamic_cast</code> as in many cases (if not most - at least in my use cases) <code>Image</code> indeed is a <code>Bitmap</code>. So</p> <pre><code>Image* img = getThumbnail( /* ... */ ); Bitmap* bitmap = dynamic_cast<Bitmap*>(img); if(!bitmap) // getThumbnail returned an Image which is not a Bitmap. Convert. else // getThumbnail returned a Bitmap so just deal with it. </code></pre> <p>However if somehow it is not (<code>bitmap</code> will be <code>NULL</code>) then you could try a more general solution.</p> <p>For example save the <code>Image</code> to a <em>COM</em> <code>IStream</code> using <code>Save</code> method and then use <code>Bitmap::FromStream</code> to create <code>Bitmap</code> from that stream.</p> <p>A simple <em>COM</em> <code>IStream</code> could be created using the <a href="http://msdn.microsoft.com/en-us/library/aa378980.aspx" rel="nofollow noreferrer"><code>CreateStreamOnHGlobal</code></a> <em>WinAPI</em> function. However this is not efficient, especially for larger streams, but to test the idea it will do.</p> <p>There are also other similar solutions which can be deduced from reading <a href="http://msdn.microsoft.com/en-us/library/ms534462.aspx" rel="nofollow noreferrer"><code>Image</code></a> and <a href="http://msdn.microsoft.com/en-us/library/ms534420.aspx" rel="nofollow noreferrer"><code>Bitmap</code></a> documentation.</p> <p>Sadly I haven't tried it on my own (with <code>Image</code> which is not a <code>Bitmap</code>) so I am not entirely sure.</p>

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