将图像动态加载到 Flash 项目中

Question

我正在尝试创建一个 as3 项目，该项目可以动态地从数据库中提取图像并将它们粘贴到我用它制作的 Flash 电影的框架中。目前我正在关注一个教程（在 as2 中，并且我正在将其转换为 as3）并试图从与项目相同的目录中加载图像，但我遇到了加载器的问题。我是 as3 的新手，因此几乎不知道我在做什么，所以我向你们寻求帮助，了解为什么我的程序无法正常运行。这是我项目的全部代码。

import flash.net.URLLoader;
import flash.events.Event;
import flash.net.URLRequest;
import flash.display.MovieClip;
import flash.display.*;
import com.greensock.TweenLite;
import com.greensock.easing.*;

var xmlPath = "content.xml";
var photos_xml:XML = new XML();
var imageList:XMLList = new XMLList();
var xmlLoader:URLLoader = new URLLoader();
xmlLoader.addEventListener(Event.COMPLETE, loadXML)
var imageLoader:Loader = new Loader();
imageLoader.addEventListener(Event.INIT, initHandler);
imageLoader.addEventListener(Event.COMPLETE, completeHandler);
var currentImage:Number = 0;
var timer:Number;

xmlLoader.load(new URLRequest(xmlPath));

//stop();

function loadXML(e:Event):void
{
    photos_xml = new XML(e.target.data);
    imageList = photos_xml.image.text();

    //for (var i:int = 0; i < imageList.length(); i++)
//  {
//      trace (imageList[i]);
//  }

    loadImage();
}

function loadImage()
{
    var loadURL = imageList[currentImage]
    var req:URLRequest = new URLRequest(loadURL);
    var targetClip:MovieClip = new MovieClip();
    targetClip.alpha = 0;
    clearInterval(timer);

    //trace(loadURL);
    //======== imageLoader refuses to throw events! ===========
    trace(req.url)
    imageLoader.load(req);
    targetClip.addChild(imageLoader);
    shell_mc.pics_mc.addChild(targetClip);

    trace("I am in loadImage");
}

function setTimer():void
{
    timer = setInterval(loadImage, 1000);
}

function removePrevious(prevImg:MovieClip):void
{
    if (prevImg != null)
    {
        removeChild(prevImg);
        //removeMovieClip(prevImg);
    }

    //trace(currentImage);
    currentImage = (currentImage + 1) % imageList.length();
}

function initHandler(event:Event):void
{
    trace("I am in initHandler");
    TweenLite.to(shell_mc.background_mc, 0.25, {width:event.target.width + 20, height:event.target.height + 20, ease:Quad.easeOut});
    TweenLite.to(shell_mc.border_mc, 0.25, {width:event.target.width, height:event.target.height, ease:Quad.easeOut});
    TweenLite.to(shell_mc.mask_mc, 0.25, {width:event.target.width, height:event.target.height, ease:Quad.easeOut});

    var clipXTarg = Math.round((stage.width / 2) - ((event.target.width + 20) / 2));
    var clipYTarg = Math.round((stage.height / 2) - ((event.target.height + 20) / 2));
    TweenLite.to(shell_mc, 0.25, {x:clipXTarg, y:clipYTarg, ease:Quad.easeOut});

    var prevImgNum:Number;
    if (currentImage == 0)
    {
        prevImgNum = imageList.length() - 1;
    }
    else
    {
        prevImgNum = currentImage - 1;
    }
    var prevImg = shell_mc.pics_mc["pic" + prevImgNum];
    TweenLite.to(prevImg, 0.25, {autoAlpha:0, onComplete:removePrevious(prevImg)});
}

function completeHandler(event:Event):void
{
    trace("I am in completeHandler");
    TweenLite.to(event.target, 0.25, {autoAlpha:100, delay:0.25});
    setTimer();
}

这里的问题是 imageLoader 在加载图像文件时不会引发任何事件，并且绝对没有错误可以告诉我为什么它可能会失败。这是我的 xml 文件的外观：

资产/DaVinci1.jpg 资产/DaVinci2.jpg 资产/DaVinci3.jpg

项目和资产文件夹都在同一个目录下，所以文件路径应该不是问题，否则我不知道。这是我正在关注的教程（http://active.tutsplus.com/tutorials/xml/flash-slideshow-xml/）

Answer 1

当您加载 swf 或 image 类型时，您需要将 eventListener 添加到 loader 而不是 contentLoaderInfo

contentLoader   = new Loader ();

contentLoader.contentLoaderInfo.addEventListener ( Event.COMPLETE, handleComplete );
contentLoader.contentLoaderInfo.addEventListener ( ProgressEvent.PROGRESS, handleProgress );
contentLoader.contentLoaderInfo.addEventListener ( ErrorEvent.ERROR, handleError );
contentLoader.contentLoaderInfo.addEventListener ( IOErrorEvent.IO_ERROR, handleError );
contentLoader.contentLoaderInfo.addEventListener ( SecurityErrorEvent.SECURITY_ERROR, handleError );

以及何时需要使用 XMLLoader 加载数据（基于文本的文件）

dataLoader              = new URLLoader ();

dataLoader.addEventListener ( Event.COMPLETE, handleComplete );
dataLoader.addEventListener ( ProgressEvent.PROGRESS, handleProgress );         
dataLoader.addEventListener ( ErrorEvent.ERROR, handleError );
dataLoader.addEventListener ( IOErrorEvent.IO_ERROR, handleError );
dataLoader.addEventListener ( SecurityErrorEvent.SECURITY_ERROR, handleError );

Answer 2

您需要将您的听众添加到loader.contentLoaderInfo，而不是loader。

imageLoader.contentLoaderInfo.addEventListener(Event.INIT, initHandler);
imageLoader.contentLoaderInfo.addEventListener(Event.COMPLETE, completeHandler);

function completeHandler(event:Event):void
{
    trace("I am in completeHandler");
    TweenLite.to(event.target.content, 0.25, {autoAlpha:100, delay:0.25});
    setTimer();
}

http://help.adobe.com/en_US/FlashPlatform/reference/actionscript/3/flash/display/Loader.html#contentLoaderInfo