{"id":147,"date":"2008-08-09T00:55:57","date_gmt":"2008-08-08T12:55:57","guid":{"rendered":"https:\/\/www.deltics.co.nz\/blog\/?p=147"},"modified":"2009-08-07T14:16:07","modified_gmt":"2009-08-07T02:16:07","slug":"multicast-events-video-2","status":"publish","type":"post","link":"https:\/\/www.deltics.co.nz\/blog\/posts\/147\/","title":{"rendered":"MultiCast Events – Video #2"},"content":{"rendered":"[Estimated Reading Time: <\/span> < 1<\/span> minutes]<\/span><\/span>

At the end of my last post I described a problem that arises if an object adds handlers to an event and is then destroyed without having removed those handlers.\u00a0 This video demonstrates that problem and also shows a solution provided by the multicast events framework itself.
\n
\nThe details of how the solution actually works will follow in my next post in the series which should be ready soon.<\/p>\n

<\/object><\/p>\n","protected":false},"excerpt":{"rendered":"

[Estimated Reading Time: <\/span> < 1<\/span> minutes]<\/span><\/span> At the end of my last post I described a problem that arises if an object adds handlers to an event and is then destroyed without having removed those handlers.\u00a0 This video demonstrates that problem and also shows a solution provided by the multicast events framework itself.<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"jetpack_publicize_message":"","jetpack_is_tweetstorm":false,"jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":[]},"categories":[4,10],"tags":[292,25,294],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_shortlink":"https:\/\/wp.me\/p1TKYv-2n","jetpack_sharing_enabled":true,"jetpack-related-posts":[{"id":86,"url":"https:\/\/www.deltics.co.nz\/blog\/posts\/86\/","url_meta":{"origin":147,"position":0},"title":"Multicast Events – Part 1","date":"05 Aug 2008","format":false,"excerpt":"I remember one of the things that got me excited when I first read about the as-then new fangled C# and .NET stuff coming out of Microsoft was the idea that a single event could have multiple handlers. Cutting a long and irrelevant story short, my interest in .NET waned,\u2026","rel":"","context":"In "Delphi"","img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":137,"url":"https:\/\/www.deltics.co.nz\/blog\/posts\/137\/","url_meta":{"origin":147,"position":1},"title":"Multicast Events – Part 3","date":"09 Aug 2008","format":false,"excerpt":"So far we've seen a multicast event implementation in (fairly limited) action, and dissected the core of it's implementation, which was a fairly dry affair. I also demonstrated a flaw in the initial implementation - a susceptibility to objects adding handlers to events but not removing them when being destroyed.\u00a0\u2026","rel":"","context":"In "Delphi"","img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":102,"url":"https:\/\/www.deltics.co.nz\/blog\/posts\/102\/","url_meta":{"origin":147,"position":2},"title":"Multicast Events – Part 2","date":"07 Aug 2008","format":false,"excerpt":"Having covered some of the basic use of multicast events, in this second post I shall start to build the implementation.\u00a0 In this first iteration we will provide the basics of a multicast event - managing and calling multiple handlers and the ability to enable and disable an event. The\u2026","rel":"","context":"In "Delphi"","img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":160,"url":"https:\/\/www.deltics.co.nz\/blog\/posts\/160\/","url_meta":{"origin":147,"position":3},"title":"MultiCast Events – Conclusion","date":"11 Aug 2008","format":false,"excerpt":"Drawing this subject to a close (finally!), here's the concluding post I promised, including the fully documented and finished implementation that has been serving me well for almost 2 years.\u00a0 The finished implementation incorporates a number of refinements to the core framework, and those are what we shall briefly look\u2026","rel":"","context":"In "Delphi"","img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":3037,"url":"https:\/\/www.deltics.co.nz\/blog\/posts\/3037\/","url_meta":{"origin":147,"position":4},"title":"ReRaise Exception Bug in 10.4.1 x86 Compiler","date":"09 Dec 2020","format":false,"excerpt":"I just ran into a very frustrating issue in Delphi 10.4.1 with long-standing, basic functionality that is now broken in certain circumstances. Fortunately there is a work-around in those certain circumstances, but it's not pretty. The Problem: Re-Raising an exception causes an immediate Access Violation error at the raise statement\u2026","rel":"","context":"In "Delphi"","img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.deltics.co.nz\/blog\/wp-content\/uploads\/image.png?resize=350%2C200&ssl=1","width":350,"height":200},"classes":[]},{"id":112,"url":"https:\/\/www.deltics.co.nz\/blog\/posts\/112\/","url_meta":{"origin":147,"position":5},"title":"Multicast Events – Video Demo 1","date":"07 Aug 2008","format":false,"excerpt":"My second post on multicast events is now up, and here's a video showing the basics. It was also an excuse to get to grips with the video capturing software - CamStudio - (and technique!), which proved to be a frustrating exercise to say the least, but I am quite\u2026","rel":"","context":"In "Delphi"","img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]}],"_links":{"self":[{"href":"https:\/\/www.deltics.co.nz\/blog\/wp-json\/wp\/v2\/posts\/147"}],"collection":[{"href":"https:\/\/www.deltics.co.nz\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.deltics.co.nz\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.deltics.co.nz\/blog\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.deltics.co.nz\/blog\/wp-json\/wp\/v2\/comments?post=147"}],"version-history":[{"count":7,"href":"https:\/\/www.deltics.co.nz\/blog\/wp-json\/wp\/v2\/posts\/147\/revisions"}],"predecessor-version":[{"id":436,"href":"https:\/\/www.deltics.co.nz\/blog\/wp-json\/wp\/v2\/posts\/147\/revisions\/436"}],"wp:attachment":[{"href":"https:\/\/www.deltics.co.nz\/blog\/wp-json\/wp\/v2\/media?parent=147"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.deltics.co.nz\/blog\/wp-json\/wp\/v2\/categories?post=147"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.deltics.co.nz\/blog\/wp-json\/wp\/v2\/tags?post=147"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}