Save a snapshot image of a Flex app without a server


Someone asked a question on flexcoders about taking a snapshot of a Flex chart and saving it to the clipboard. Well, that’s actually pretty hard, but this example shows how to load a snapshot image of any Flex component that the user can choose to copy or save. It opens a popup window with the image embedded. You’ve still got to right click on the image and either “Copy Image” or “Save Image As…”. But no server is required, it’s all done on the client with a magic little javascript trick.

It uses the data: URI schema supported by Firefox and other non-crappy browsers (no, IE does not support the data: URI syntax). So this works in Firefox, but does not work in IE. Whatever, fuck em.

I saw this method first demonstrated by Mansour Raad at 360Flex. It’s pretty clever. There are some limitations though:

  • Doesn’t work in IE (after writing Flex apps so much I forgot how much browser differences suck… I hate browsers)
  • There’s a limit on how much data you can embed in a data: URI, I don’t know what this is, it might be 1,024 bytes. So this might not work with really big images.

The sample app shows a little chart that plots the framerate of the Flex app. When you click on one of the snapshot buttons it will open a popup window with an image of the chart at that time. From there you can right click and save or copy or whatever. This also makes use of Abdul Qabiz’s javascript injection technique, which allows me to write and execute JavaScript code from within my Flex app. And I’m using the PNGEncoder class in as3corelib.

View the source here.

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~ by mjcprasad2000 on July 7, 2009.

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