Flex 创建过滤特定文件的FileReference

下面的代码演示了Flex中如何创建一个可以过滤特定后缀文件的FileReference，

var imagesFilter:FileFilter = new FileFilter("Images","*.jpg;*.gif;*.png");
var docFilter:FileFilter = new FileFilter("Documents","*.pdf;*.doc;*.txt");
var myFileReference:FileReference = new FileReference();
myFileReference.browse([imagesFilter, docFilter]);

示例：

<?xml version="1.0"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml">
  <mx:Script>
    <![CDATA[
      private var oneFileFileFilter:FileFilter = newFileFilter("sample.pdf", "sample.pdf");
      private var pdfFileFileFilter:FileFilter = newFileFilter("PDF Files", "*.pdf");
      private function oneFile():void{
        var fileRef:FileReference = new FileReference();
        fileRef.browse([oneFileFileFilter]);
      }
      private function pdfFiles():void{
        var fileRef:FileReference = new FileReference();
        fileRef.browse([pdfFileFileFilter]);
      }
    ]]>
  </mx:Script>
  <mx:Button label="One File - sample.pdf"click="oneFile()"/>
  <mx:Button label="All pdf Files" click="pdfFiles()"/>
</mx:Application>

From
http://cookbooks.adobe.com/index.cfm?event=showdetails&postId=11366
http://blog.minidx.com/2008/10/23/1574.html