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• Pre-load audio files at the client-side for later use

  - by awj

  I'm building an online test which implements audio (mp3) using the native audio player (i.e. non Flash-based). The test shows one question at a time and loads each subsequent question asynchronously. Some questions have an accompanying audio file, others don't, and the audio files can be several MB in size. So what I'm hoping to do is to preload the audio files client-side at the start of the test and then move these into place when the relevant question comes up. So far I've tried loading an audio file into a QuickTime player, then when that question comes up I use jQuery's clone(true) method to copy this into a part of the page which is displayed. However, when I do this the QuickTime player has to reload the audio file from source. Same is true for Windows Media Player. Does anyone have any suggestions as to how I can preload the audio client-side and then call it forward when needed?

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• Programmatically refresh Windows Explorer (not IE) window

  - by awj

  I'm using a Windows Service to do some directory cleaning (implementing a FileSystemWatcher). The problem I'm having is that sometimes, when several files in a directory are deleted, one of the files still shows in the Explorer window. If you refresh the window the file disappears. Similarly, if you right-click on it or try to copy it, a pop-up informs that it no longer exists. So what I'd like to know is: is there any way I can programmatically refresh the view of the Explorer window?

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• Most efficient method of generating PNG as HTTP response

  - by awj

  I've built an ASP.NET page whose output stream is a dynamically-generated PNG image containing only text on a transparent background. The text is based upon database IDs contained in the querystring. There will be a limited number of variations. Which one of the following would be the most efficient means of returning the image to the client? Store each variation upon the first generation, and thenceforth retrieve this from the drive. Simply generate the image each time. Cache the output response based upon the querystring.

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• Parse CSS out from <style> elements

  - by awj

  Can someone tell me an efficient method of retrieving the CSS between tags on a page of markup in .NET? I've come up with a method which uses recursion, Split() and CompareTo() but is really long-winded, and I feel sure that there must be a far shorter (and more clever) method of doing the same. Please keep in mind that it is possible to have more than one element on a page, and that the element can be either or .

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