Question

我是Flex的新手。我想使用flex检索文件的二进制内容但是失败了。这是迄今为止的代码：

// ActionScript file

package source.fileApi{
    import flash.display.Sprite;
    import flash.external.ExternalInterface;
    import flash.system.Security;
    import flash.utils.setTimeout;

    import flash.net.FileReference;
    import flash.net.FileFilter;
    import flash.events.IOErrorEvent;
    import flash.events.Event;
    import flash.utils.ByteArray;

    import mx.utils.URLUtil;

    public class FileAPIMain {
        private var debug:Boolean = false;
        private var dataReaded:String;
        private var fr:FileReference;

        public function FileAPIMain():void{
            ExternalInterface.addCallback("setDebug", setDebug);
            ExternalInterface.addCallback("onLoadFileClick", onLoadFileClick);
            ExternalInterface.call("FileReader.__onFlashInitialized");
        }

        public function log(message:String):void {
            if (debug) {
                ExternalInterface.call("FileReader.__log", encodeURIComponent("[FileReader] " + message));
            }
        }

        public function setDebug(val:Boolean):void {
            debug = val;
            if (val) {
                log("debug enabled");
            }
        }

        public function onLoadFileClick():void{
            //create the FileReference instance
            fr = new FileReference();

            //listen for when they select a file
            fr.addEventListener(Event.SELECT, onFileSelect);

            //listen for when then cancel out of the browse dialog
            fr.addEventListener(Event.CANCEL,onCancel);

            //open a native browse dialog that filters for text files
            fr.browse();
        }

        private function onFileSelect(e:Event):void{
            fr.removeEventListener(Event.SELECT, onFileSelect);
            //listen for when the file has loaded
            fr.addEventListener(Event.COMPLETE, onLoadComplete);

            //listen for any errors reading the file
            fr.addEventListener(IOErrorEvent.IO_ERROR, onLoadError);

            //load the content of the file
            fr.load();
        }

        private function onCancel(e:Event):void{
            log("File Browse Canceled");
            fr = null;
        }

      private function onLoadComplete(e:Event):void{
        fr.removeEventListener(Event.COMPLETE, onLoadComplete);

        //get the data from the file as a ByteArray
        var data:ByteArray = fr.data as ByteArray;

            dataReaded = data.readUTFBytes(data.bytesAvailable);

            ExternalInterface.call("FileReader.__getSize", fr.size);
            ExternalInterface.call("FileReader.__getName", fr.name);
            ExternalInterface.call("FileReader.__getData", dataReaded);
      ExternalInterface.call("FileReader.__takeAction");

            //clean up the FileReference instance
            fr = null;
        }

        private function onLoadError(e:IOErrorEvent):void{
            log("Error loading file : " + e.text);
        }
   }
}

但是这并没有给我文件的二进制内容..任何人都可以告诉我如何使用Flex检索给定文件的完整二进制内容（我使用的是FP 10.0）.....

Answer 1

如果您使用FLashPlayer 10+，则使用FileReference。

请参阅下面的纯AS3示例


var buttonShape:Shape = new Shape();

buttonShape.graphics.beginFill(0x336699);
buttonShape.graphics.drawCircle(50, 50, 25);

var button = new SimpleButton(buttonShape, buttonShape, buttonShape, buttonShape);

addChild(button);

var fileRef:FileReference= new FileReference();
button.addEventListener(MouseEvent.CLICK, onButtonClick);

function onButtonClick(e:MouseEvent):void 
{
  fileRef.browse([new FileFilter("Images", "*.jpg;*.gif;*.png")]);
  fileRef.addEventListener(Event.SELECT, onFileSelected);
}

function onFileSelected(e:Event):void 
{
  fileRef.addEventListener(Event.COMPLETE, onFileLoaded);
  fileRef.load();
}

function onFileLoaded(e:Event):void 
{
   // here we get the data
   var theData:Object  = e.target.data;

   // next you can manipulate the data as you like! ;) depending on the type
}

如何在flex中读取文件的二进制内容

1 个答案: