DoNotYet.com » Flex http://www.donotyet.com Freebie Resources for Tech Users, AIR, Flex, Flash Developers and Photoshop, web Designers Wed, 07 Dec 2011 06:35:54 +0000 http://wordpress.org/?v=2.8.2 en hourly 1 ASZip: A Very Useful ActionScript 3 library to Generate ZIP file with Simple Interface http://www.donotyet.com/2009/09/27/aszip-a-very-useful-actionscript-3-library-to-generate-zip-file-with-simple-interface/ http://www.donotyet.com/2009/09/27/aszip-a-very-useful-actionscript-3-library-to-generate-zip-file-with-simple-interface/#comments Sun, 27 Sep 2009 13:49:03 +0000 admin http://www.donotyet.com/2009/09/27/aszip-a-very-useful-actionscript-3-library-to-generate-zip-file-with-simple-interface/ Because a zip file permits a number of compression algorithms so a ZIP file contains one or more files. FZip is a cute little Actionscript 3 class library, it parses ZIP archives progressively, allowing access to contained files while the archive is loading(@see Actionscript 3 class zip library–FZip).

Now we will introduce an other actionscript zip library: ASZip.  You can generate ZIP files from ActionScript 3 with ASZip. ASZip uses the native gzip (Deflate) compression from the flash.utils.Bytearray.compress() method. More compression algorithms will be added in the future. ASZip has simple interface to add different types of files and directories.

ASZip-ActionScript-3-library

The following is a simple sample to generate a text file and PNG file to a zip file:

  1. // create the Zip file, first param : compression method
  2. var myZip:ASZip = new ASZip (CompressionMethod.GZIP);
  3. // create a flash.display.BitmapData
  4. var myStevie:Stevie = new Stevie (0, 0);
  5. // encode it as a PNG
  6. var bytes:ByteArray = PNGEnc.encode (myStevie);
  7. // create a text stream
  8. var txt:ByteArray = new ByteArray();
  9. // write some text into it
  10. txt.writeUTFBytes("Hello there !!");
  11. // add a pics folder
  12. myZip.addDirectory ("pics/");
  13. // then a text folder
  14. myZip.addDirectory ("text/");
  15. // pass the PNG stream and specify a file name and location
  16. myZip.addFile (bytes, "pics/stevie.png");
  17. // pass the text stream and specify a file name and location
  18. myZip.addFile (txt, "text/story.txt");
  19. // add a comment
  20. myZip.addComment ("A comment !");
  21. // generate final Zip file
  22. var myZipFile:ByteArray = myZip.saveZIP ( Method.LOCAL );

You can download the source from: http://code.google.com/p/aszip/downloads/list

 

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]]> http://www.donotyet.com/2009/09/27/aszip-a-very-useful-actionscript-3-library-to-generate-zip-file-with-simple-interface/feed/ 1 How to Wait or Sleep in Flex/ActionScript http://www.donotyet.com/2009/08/28/how-to-wait-or-sleep-in-flex-actionscript/ http://www.donotyet.com/2009/08/28/how-to-wait-or-sleep-in-flex-actionscript/#comments Fri, 28 Aug 2009 14:52:01 +0000 admin http://www.donotyet.com/2009/08/28/how-to-wait-or-sleep-in-flex-actionscript/ If you want to upload a big file to server or do a long time action in Flex/ActionScript like HTTPService to communicate with an external server that hosts the database, a time delay function like Sleep() will be needed.

So, is there a sleep function in flex 2 ? Run multi-thread, one sleep and wait the result of this thread and the other will be continue.

Unfortunatly, because the flash player, from our perspective, is single threaded so we can not do that.

Sleep-and-wait-in-Flex

But we can flash.utils.Timer to get the same effect:

  1. setTimout( yourFunction ,200);

This function will call yourFunction after waiting 200 milliseconds.

The explanation of setTimeout() function:

Runs a specified function after a specified delay (in milliseconds).

Instead of using this method, consider creating a Timer object, with the specified interval, using 1 as the repeatCount parameter (which sets the timer to run only once).

If you intend to use the clearTimeout() method to cancel the setTimeout() call, be sure to assign the setTimeout() call to a variable (which the clearTimeout() function will later reference). If you do not call the clearTimeout() function to cancel the setTimeout() call, the object containing the set timeout closure function will not be garbage collected.

setTimeout():

Runs a specified function after a specified delay (in milliseconds).

Instead of using this method, consider creating a Timer object, with the specified interval, using 1 as the repeatCount parameter (which sets the timer to run only once).

If you intend to use the clearTimeout() method to cancel the setTimeout() call, be sure to assign the setTimeout() call to a variable (which the clearTimeout() function will later reference). If you do not call the clearTimeout() function to cancel the setTimeout() call, the object containing the set timeout closure function will not be garbage collected.

Here is the list of functions for timing code execution: http://livedocs.adobe.com/flex/3/langref/flash/utils/package.html

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]]> http://www.donotyet.com/2009/08/28/how-to-wait-or-sleep-in-flex-actionscript/feed/ 1 An example of How to load FlashPaper in Flex(with source code) http://www.donotyet.com/2009/08/15/an-example-of-how-to-load-flashpaper-in-flex/ http://www.donotyet.com/2009/08/15/an-example-of-how-to-load-flashpaper-in-flex/#comments Sat, 15 Aug 2009 13:23:16 +0000 admin http://www.donotyet.com/2009/08/15/an-example-of-how-to-load-flashpaper-in-flex/ FlashPaper is very useful, we can create web-ready Flash documents or secure, compact PDF files from any printable document in just one click with FlashPaper.  The following is some main feature of FlashPaper introduced on the offical site:

  • Easily create or e-mail any Microsoft Office document as a Flash document or PDF
  • Instantly secure sensitive medical, legal or business documents
  • Streamline document distribution with highly compressed files
  • Create universally accessible files that are viewable on any platform
  • Quickly capture web pages and HTML
  • Create online newsletters, flyers and marketing materials

Adobe-FlashPaper_1808g

But if you are a flex developer, who has ever tried to load a FlashPaper document within a Flex application, then you should know it’s not so simple. The problem is: when a FlashPaper SWF is loaded in the flash player directly, as window is resized the area available for the document resizes, but the toolbars at the top stay the same height. Here is a sample on how to load FlashPaper in Flex, you can download full source code from downloadhere.

Flex souce code:

  1. < ?xml version="1.0" encoding="utf-8"?>
  2. <mx :WindowedApplication xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" creationComplete="initType()">
  3.     </mx><mx :Script>
  4.         < ![CDATA[
  5.             import com.magReader.FlashPaperLoader;
  6.             //flashpaper
  7.             private var magReader:FlashPaperLoader;
  8.  
  9.             private function initType():void
  10.             {
  11.                 var urlStr:String = "Fpl.swf?url=template.swf";
  12.                 magReader = new FlashPaperLoader();
  13.                 magReader.source = urlStr;
  14.                 magReader.visible = false;
  15.                 magContainer.addChild(magReader);
  16.                 //loadingBar.visible = true;
  17.                 magReader.addEventListener(FlashPaperLoader.FLASH_PAPER_LOADED,fpLoaded);
  18.             }
  19.             //flashpaper
  20.             private function fpLoaded(evt:Event):void
  21.             {
  22.                 //trace("magContainer width = " + magContainer.width + " magContainer height = " + magContainer.height);
  23.                 magReader.setSize(magContainer.width,magContainer.height);
  24.                 magReader.visible = true;
  25.                 //loadingBar.visible = false;
  26.  
  27.                 //magContainer.removeChild(loadingBar);
  28.                 magReader.removeEventListener(FlashPaperLoader.FLASH_PAPER_LOADED,fpLoaded);
  29.             }
  30.  
  31.             public function changSize():void
  32.             {
  33.                 if(magReader != null)
  34.                 {
  35.                     magReader.setSize(magContainer.width,magContainer.height);
  36.                 }
  37.             }
  38.         ]]>
  39.     </mx>
  40.  
  41.     <mx :Canvas id="magContainer" width="100%" height="100%" resize="changSize()" horizontalScrollPolicy="off" verticalScrollPolicy="off">
  42.  
  43.     </mx>

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