如何将文件转换为Flex中的ByteArray？ [英] How can I convert a file to a ByteArray in Flex?

问题描述

我想知道如何将我的服务器上的文件（pdf / excel / ppt）转换为ByteArray。我想这样做的原因是显示对话框打开/保存为用户，我必须设置内容类型为八位字节流。对话只显示navigateToURL（），但对于pdf，这是用户的本地浏览器设置。对于URLRequest，我必须将数据设置为ByteArray。我试图使用位于这里的代码：

用Flex自定义打印

 < / p>如果你的目标是Flash Player 10， ？xml version =1.0encoding =utf-8？> 
  
< mx：Script> 
<！[CDATA [
 
 private var loadedFile：ByteArray; 
 
 private function loadFile（）：void 
 {
 var request：URLRequest = new URLRequest（http://test.enunciato.org/sample.pdf）; 
 var urlLoader：URLLoader = new URLLoader（request）; 
 
 urlLoader.addEventListener（Event.COMPLETE，onURLLoaderComplete）; 
 urlLoader.dataFormat = URLLoaderDataFormat.BINARY; 
 urlLoader.load（request）; 
 
 
 private函数onURLLoaderComplete（event：Event）：void 
 {
 loadedFile = event.target.data; 
 
 $ b $ private function saveLoadedFile（）：void 
 {
 var file：FileReference = new FileReference（）; 
 file.save（loadedFile，SampleDoc.PDF）; 
} 
 
]]> 
< / mx：Script> 
 
  
< / mx：应用程序>假设你先加载文件 - 在这个例子中，加载操作发生在creationComplete上，并且字节被保存在loadedFile中 - 当用户点击保存图像时，字节应该准备好保存。经过测试和验证的例子工程。希望它有帮助！
 
I was wondering how to convert a file I have on my server (pdf/excel/ppt) to a ByteArray. The reason I want to do this is to display the dialogue open/save as to the user and I must set the Content-Type to octet-stream. The dialogue shows fine with just navigateToURL() but for pdf's it is the user's local browser setting. For a URLRequest I must set the data as a ByteArray.  I'm trying to use the code located here:

  
Custom printing with Flex

解决方案
Provided you're targeting Flash Player 10, this should work:
<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" creationComplete="loadFile()">

    <mx:Script>
        <![CDATA[

            private var loadedFile:ByteArray;

            private function loadFile():void
            {
                var request:URLRequest = new URLRequest("http://test.enunciato.org/sample.pdf");
                var urlLoader:URLLoader = new URLLoader(request);

                urlLoader.addEventListener(Event.COMPLETE, onURLLoaderComplete);
                urlLoader.dataFormat = URLLoaderDataFormat.BINARY;
                urlLoader.load(request);
            }

            private function onURLLoaderComplete(event:Event):void
            {
                loadedFile = event.target.data;
            }

            private function saveLoadedFile():void
            {
                var file:FileReference = new FileReference();
                file.save(loadedFile, "SampleDoc.PDF"); 
            }

        ]]>
    </mx:Script>

    <mx:Button label="Save Image" horizontalCenter="0" verticalCenter="0" click="saveLoadedFile()" />

</mx:Application>
Assuming you load the file first -- in this example, the load operation happens on creationComplete, and the bytes get stored off in loadedFile -- the bytes should be and ready for saving when the user clicks Save Image.  Tested and verified the example works.  Hope it helps!

                        
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