1
使用Flash Builder 4使用Flex 4.1。 我有一个空气应用程序,用于下载数组中指定的文件。 我正试图在文件写入磁盘后更改状态。等到阵列功能完成到:
功能finalscreen的文件下载完成之前被调用。这对于我放大来测试它的大视频文件来说很明显。
<fx:Script>
<![CDATA[
function finalscreen()
{
this.currentState="Finished";
}
private function initiate_download(event:MouseEvent):void
{
this.currentState="Working";
var filearray:Array = new Array();
filearray[0]="0.jpg";
filearray[1]="1.jpg";
filearray[2]="2.jpg";
filearray[3]="3.jpg";
filearray[4]="4.jpg";
filearray[5]="5.jpg";
filearray[6]="6.jpg";
filearray[7]="7.jpg";
filearray[8]="8.jpg";
filearray[9]="9.jpg";
filearray[10]="10.jpg";
filearray[11]="1.avi";
for (var i:uint; i < filearray.length; i++) {
var remoteURL = "http://domain/dir/" + filearray[i];
var localURL = "C:/dir/" + filearray[i];
downloadFile(remoteURL, localURL);
}
finalscreen();
function downloadFile(url, filename)
{
// Create the stream for the data request
var urlStream = new URLStream();
// Used to initiate request for remote file
var request = new URLRequest(url);
// Create file stream
var fileStream = new FileStream();
// Create a reference to a location on disk
var file = File.desktopDirectory.resolvePath(filename);
// Called as download progresses
var writeFile = function()
{
// Write to file
if (urlStream.bytesAvailable > 51200)
{
var dataBuffer = new ByteArray();
urlStream.readBytes(dataBuffer, 0, urlStream.bytesAvailable);
fileStream.writeBytes(dataBuffer, 0, dataBuffer.length);
}
return true;
}
// Called when download completes
var finishWriteFile = function()
{
// Write to file
if(urlStream.bytesAvailable > 0)
{
var dataBuffer = new ByteArray();
urlStream.readBytes(dataBuffer, 0, urlStream.bytesAvailable);
fileStream.writeBytes(dataBuffer, 0, dataBuffer.length);
}
// Close streams
fileStream.close();
urlStream.close();
return true;
}
// Initiate download
fileStream.open(file, FileMode.WRITE);
urlStream.load(request);
// Add event listeners
urlStream.addEventListener(Event.COMPLETE, finishWriteFile);
urlStream.addEventListener(ProgressEvent.PROGRESS, writeFile);
}
}
]]>
</fx:Script>
<fx:Declarations>
<!-- Place non-visual elements (e.g., services, value objects) here -->
</fx:Declarations>
<s:states>
<s:State name="Start"/>
<s:State name="Working"/>
<s:State name="Finished"/>
</s:states>
谢谢!
好吧,我一直在用这个搞乱并且限制阵列循环进行到第11,离开最后一个称之为“复制”功能最后状态发生变化,但由于异步写入,它不能正常工作。我将openSync中的fileStream改为刚刚打开,并尝试使文件顺序下载,但这会减慢速度。 – mubhcaeb 2010-12-15 17:24:48
几乎得到它! 改为开放模式来更新,以便它可以返回close事件。 fileStream.openAsync(file,FileMode.UPDATE); 现在我的eventlistener可以开火了! fileStream.addEventListener(Event.CLOSE,??????); 和它的作品,如果我将它设置为finalScreen上最大的文件。我现在需要在文件关闭之后完成它,它将进入阵列中的下一个。 – mubhcaeb 2010-12-17 17:42:46