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我加載XML文件,這個簡單的Flash CS5/ActionScript 3的程序:爲什麼URLStream.connected始終爲真?
import flash.net.*;
var URL_REQUEST:URLRequest = new URLRequest('http://preferans.de/top-xml.php');
var URL_STREAM:URLStream = new URLStream();
var URL_VARS:URLVariables = new URLVariables();
var UPDATE_TIMER:Timer = new Timer(1000);
stop();
UPDATE_TIMER.addEventListener(TimerEvent.TIMER, handleTimer);
UPDATE_TIMER.start();
URL_REQUEST.method = URLRequestMethod.GET;
URL_REQUEST.data = URL_VARS;
URL_STREAM.addEventListener(IOErrorEvent.IO_ERROR, handleUserError);
URL_STREAM.addEventListener(SecurityErrorEvent.SECURITY_ERROR, handleUserError);
URL_STREAM.addEventListener(Event.OPEN, handleUserOpen);
URL_STREAM.addEventListener(ProgressEvent.PROGRESS, handleUserData);
URL_STREAM.addEventListener(HTTPStatusEvent.HTTP_STATUS, handleUserStatus);
URL_STREAM.addEventListener(Event.COMPLETE, handleUserComplete);
URL_STREAM.load(URL_REQUEST);
function handleUserOpen(event:Event):void {
trace('handleUserOpen: ' + event);
}
function handleUserData(event:Event):void {
trace('handleUserData: ' + event);
}
function handleUserStatus(event:HTTPStatusEvent):void {
trace('handleUserStatus: ' + event.status);
}
function handleUserError(event:Event):void {
trace('handleUserError: ' + event);
}
function handleUserComplete(event:Event):void {
trace('handleUserComplete: ' + event);
try {
var str:String = URL_STREAM.readUTFBytes(URL_STREAM.bytesAvailable);
var xml:XML = new XML(str);
trace(xml);
} catch(e:Error){
trace('Invalid data: ' + e);
return;
}
}
function handleTimer(event:TimerEvent):void {
var now:int = getTimer();
trace(UPDATE_TIMER.currentCount + ' ' + now + ' ' + URL_STREAM.connected);
}
它工作正常,我可以看到XML內容:
handleUserOpen: [Event type="open" bubbles=false cancelable=false eventPhase=2]
handleUserData: [ProgressEvent type="progress" bubbles=false cancelable=false eventPhase=2 bytesLoaded=2390 bytesTotal=2390]
handleUserStatus: 200
handleUserComplete: [Event type="complete" bubbles=false cancelable=false eventPhase=2]
<pref>
[ .... XML content .....]
</pref>
1 1054 true
2 2054 true
3 3054 true
4 4054 true
5 5054 true
.....
90 90054 true
91 91054 true
,但我不明白,爲什麼是URLStream.connected總是true。
我甚至在我的web服務器上重新啓動Apache,但它不會改變任何東西。
我在問這個問題,因爲我計劃在我的程序中實現Comet-like(又名HTTP-push)調用,並且需要知道,如果URLStream仍然工作/忙碌,或者它已完成/中斷,並且可以重新用於新的加載()調用(並且我不想爲此引入變通辦法狀態變量)。
謝謝! 亞歷克斯