故障使用ActionScript装载机活动 [英] Trouble With ActionScript Loader Events

问题描述

我用装载机工作，要求从WMS（Web地图服务）的图像。一切事情都很好，很正常了有效的请求。

在一个糟糕的请求发送到仓库管理系统，通常是返回一个标准异常文档（XML）。但是，加载程序不火时，一个坏的请求作出任何情况下（特别是完全或ioError事件的）。

有没有人有任何建议，我怎么可以捕获任何东西是不是可能会返回一个形象呢？

 覆盖保护功能loadMapImage（装载机：装载机）：无效
{
//更新参数值
_params =新的URLVariables（）;
_params.request =的GetMap;
_params.format =图像/ PNG;
_params.version =1.1.1;
_params.layers = this.layers;
_params.styles =;
_params.transparent =TRUE;
_params.bbox = map.extent.xmin +，+ map.extent.ym​​in +，+ map.extent.xmax +，+ map.extent.ym​​ax;
_params.srs =EPSG：+ map.spatialReference.wkid;
_params.width = map.width;
_params.height = map.height;

_urlRequest =新的URLRequest（this.url）;
_urlRequest.data = _params;

configureListeners（loader.contentLoaderInfo）;

loader.load（_urlRequest）;
}

私有函数configureListeners（调度员：IEventDispatcher，请）：无效
{
//dispatcher.addEventListener(Event.INIT，initHandler）;
//dispatcher.addEventListener(Event.UNLOAD，unloadHandler）;
dispatcher.addEventListener（引发Event.COMPLETE，在completeHandler）;
//dispatcher.addEventListener(Event.OPEN，openHandler）;
//dispatcher.addEventListener(ProgressEvent.PROGRESS，progressHandler）;
//dispatcher.addEventListener(SecurityErrorEvent.SECURITY_ERROR，securityErrorHandler）;
//dispatcher.addEventListener(HTTPStatusEvent.HTTP_STATUS，的httpStatusHandler）;
dispatcher.addEventListener（IOErrorEvent.IO_ERROR，事件。ioErrorHandler）;
//dispatcher.addEventListener(Event.ACTIVATE，activateHandler）;
//dispatcher.addEventListener(Event.DEACTIVATE，deactivateHandler）;
}

私有函数事件。ioErrorHandler（事件：IOErrorEvent）：无效
{
跟踪（'事件。ioErrorHandler事件'）;
}

私有函数在completeHandler（事件：事件）：无效
{
跟踪（在completeHandler事件'）;
}
 

解决方案

一种可能性，你可以考虑正在转换你的Loader来使用URLLoader，可以给你更多的灵活性上看到的数据实际上被请求/接收。

该display.Loader类有一些奇怪的怪癖，根本不会允许某些事件，如果它试图加载没有一个合适的入门级（通常display.Sprite派生的类）的对象火。

我想的URLLoader将是有益的，因为你可以设置URLLoaderDataFormat为二进制。这将捕获任何返回，并将其存储在一个ByteArray对象，你可以加载到通过Loader.loadBytes（）一个display.Loader，如果它是一个有效的图像，或者干脆转换URLLoaderData.toString（）来检索你的XML信息。

I am working with a loader to request an image from a WMS(Web Mapping Service). Everything thing is fine and dandy with a valid request.

When a bad request is made to a WMS, a Standard Exception Document(XML) is usually returned. However, the loader doesn't fire any event (specifically the Complete or IOError events) when a bad request is made.

Does anyone have any suggestions on how I can trap anything that is not an image that might be returned?

override protected function loadMapImage(loader:Loader):void
{
// update parameter values
_params = new URLVariables();
_params.request = "GetMap";
_params.format = "image/png";
_params.version = "1.1.1";
_params.layers = this.layers;
_params.styles = "";
_params.transparent = "TRUE";
_params.bbox = map.extent.xmin + "," + map.extent.ymin + "," + map.extent.xmax + "," + map.extent.ymax;
_params.srs = "EPSG:" + map.spatialReference.wkid;
_params.width = map.width;
_params.height = map.height;

_urlRequest = new URLRequest(this.url);
_urlRequest.data = _params;

configureListeners(loader.contentLoaderInfo);

loader.load(_urlRequest);
}

private function configureListeners(dispatcher:IEventDispatcher):void 
{
//dispatcher.addEventListener(Event.INIT, initHandler);
//dispatcher.addEventListener(Event.UNLOAD, unloadHandler);
dispatcher.addEventListener(Event.COMPLETE, completeHandler);
//dispatcher.addEventListener(Event.OPEN, openHandler);
//dispatcher.addEventListener(ProgressEvent.PROGRESS, progressHandler);
//dispatcher.addEventListener(SecurityErrorEvent.SECURITY_ERROR, securityErrorHandler);
//dispatcher.addEventListener(HTTPStatusEvent.HTTP_STATUS, httpStatusHandler);
dispatcher.addEventListener(IOErrorEvent.IO_ERROR, ioErrorHandler);
//dispatcher.addEventListener(Event.ACTIVATE, activateHandler);
//dispatcher.addEventListener(Event.DEACTIVATE, deactivateHandler);
}

private function ioErrorHandler(event:IOErrorEvent):void
{
trace('ioErrorHandler event');
}

private function completeHandler(event:Event):void 
{
trace('completeHandler event');
}

解决方案

One possibility you could look into is converting your Loader to a URLLoader, as to give you more flexibility over seeing what data is actually being requested/received.

The display.Loader class has some strange quirks that simply won't allow certain events to fire if it attempts to load an object that does not have a proper entry class (typically a class derived from display.Sprite).

I think the URLLoader will be beneficial, as you can set the URLLoaderDataFormat to BINARY. This will catch whatever is returned and store it in a ByteArray object, which you can either load into a display.Loader via Loader.loadBytes() if it is a valid image, or simply convert the URLLoaderData.toString() to retrieve your XML information.

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