Adobe Air多功能下载

Question

我一直在网络和stackoverflow上搜索实现多次下载mp3文件downloadManager的完整答案。我读了很多文章，意识到最有效的方法是使用ByteArray、URLStream和FileStream来保存磁盘。我已经实现如下：

<?xml version="1.0" encoding="utf-8"?>
<s:WindowedApplication xmlns:fx="http://ns.adobe.com/mxml/2009" 
xmlns:s="library://ns.adobe.com/flex/spark" 
xmlns:mx="library://ns.adobe.com/flex/mx"     
creationComplete="downloadFiles()">
<fx:Declarations>
</fx:Declarations>
<fx:Script>
<![CDATA[
import flash.filesystem.*;
import flash.net.URLStream;
public var stream:URLStream;
public var fileData:ByteArray;
public var fileStream:FileStream;
public var file:File; 
public var trackString:String;
public var filearray:Array;
public var urlReq:URLRequest;
private function downloadFiles():void
{
filearray = new Array();
filearray[0]="Crazy";
filearray[1]="Distant Lover";
filearray[2]="Easy Going";
filearray[3]="Give In To Love";
filearray[4]="MuzicAgeErotic Moods";
filearray[5]="MuzicAgeGive In To Love";
filearray[6]="MuzicAgePieces Of Dreams";
filearray[7]="MuzicAgeThere will never be another you";
filearray[8]="Remembered";
filearray[9]="Teach Me Tonight"; 
downloadNextFile();
}
private function downloadNextFile():void{
trackString = filearray.shift();
urlReq = new URLRequest("http://localhost:8080/multiDownloadSampleApp7- debug/MuzicAge/"+trackString+".mp3");
stream = new URLStream();
file = File.documentsDirectory.resolvePath("C:/Users/development/test/"+trackString+".mp3"); 
fileStream = new FileStream(); 
stream.addEventListener(ProgressEvent.PROGRESS, progressBar); 
stream.addEventListener(Event.COMPLETE, writeComplete); 
stream.load(urlReq); 
}
private function writeComplete(evt:Event):void
{     
fileData = new ByteArray();     
stream.readBytes(fileData,0,stream.bytesAvailable); 
fileStream.openAsync(file, FileMode.WRITE)     
fileStream.writeBytes(fileData,0,fileData.length);     
fileStream.close();         
stream.removeEventListener(ProgressEvent.PROGRESS, progressBar);     
stream.removeEventListener(Event.COMPLETE, writeComplete); 
downloadNextFile();
} 
private function progressBar(evt:ProgressEvent):void
{     
// progressBar 
}
]]>
</fx:Script>
</s:WindowedApplication>

尽管它似乎可以捕获所有MP3并将其保存到磁盘，但我一直收到以下错误消息
错误#2044:未处理的IOErrorEvent:。text=错误#2032:流错误。在multiDownloadSampleApp7/downloadNextFile（）[C:\Users\development\newgageProjects\multiDownloadSampleApp7\src\multiDownloadSampleApp 7.mxml:40]在multiDownloadSampleApp7/writeComplete（[卸载SWF]multiDownloadSampleApp7.SWF

当我关闭错误并在保存目录中查找时，我会在数组中找到我请求的所有MP3。

Answer 1

在调用downloadNextFile()之前，您似乎并没有检查是否已下载完所有文件。

因此，错误可能只是它到达数组的末尾，然后尝试生成一个带有空字符串的URLRequest。