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    <p>DirectShow Filters seems to be the most popular way to do this. See this answer <a href="https://stackoverflow.com/questions/810994/using-windows-media-encoder-to-record-screen/811047#811047">using Windows Media Encoder to record screen</a>. A few good links in there.</p> <p>Windows Media Encoder SDK is also an option, but requires the user have it installed and configured correctly. Search Bing or Google for <em>"Windows Media Encoder SDK"</em> and <em>"Screen Capture"</em>, you should see quite a few forum posts.</p> <p>For the <em>taking lots of screenshots</em> method, an article on doing this, including various methods and source can be found at <a href="http://gpalem.web.officelive.com/screencap.html" rel="nofollow noreferrer">http://gpalem.web.officelive.com/screencap.html</a>. </p> <p>UltraVNC's help talks a little about their <em>Mirror Video Driver</em> at <a href="http://www.uvnc.com/onlinehelp/8.html" rel="nofollow noreferrer">http://www.uvnc.com/onlinehelp/8.html</a>. It's light on details but gives a hint as to how they do it.</p> <p>I believe how you capture will be heavily influence by your protocol. Do you need the entire screen? Deltas? etc. A list of the main protocols of commerical and opensource programs can be found at.... <a href="http://en.wikipedia.org/wiki/Remote_desktop_software" rel="nofollow noreferrer">http://en.wikipedia.org/wiki/Remote_desktop_software</a> </p> <p>And an exhaustive list of programs, including their protocols and features can be found at... <a href="http://en.wikipedia.org/wiki/Comparison_of_remote_desktop_software" rel="nofollow noreferrer">http://en.wikipedia.org/wiki/Comparison_of_remote_desktop_software</a></p> <p>As ho said, you can check out how other have done it. Depending on the license of the application of course. The second Wikipedia link has over 15 open source programs using various screen capture / transfer techniques and protocols. </p>
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