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

问题描述

我想知道如何将服务器上的文件 (pdf/excel/ppt) 转换为 ByteArray.我想这样做的原因是向用户显示打开/保存的对话框，我必须将 Content-Type 设置为 octet-stream.仅使用 navigateToURL() 就可以正常显示对话，但对于 pdf 而言，它是用户的本地浏览器设置.对于 URLRequest，我必须将数据设置为 ByteArray.我正在尝试使用位于此处的代码:

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:

使用 Flex 进行自定义打印

推荐答案

如果您的目标是 Flash Player 10，这应该可行:

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>

假设您首先加载文件——在本例中，加载操作发生在 creationComplete 上，并且字节存储在加载文件中——当用户单击保存图像"时，字节应该准备好保存.测试并验证了示例的工作原理.希望能帮到你！

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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