ArcGIS Server动态读取图层样式（Flex版）

原址：http://virgoooos.iteye.com/blog/794991

在ArcGIS10的rest接口已经提供给我们动态读取图层样式的接口了。?

其实当我们在访问ArcGIS Server10的时候，会发现每一个服务界面提供给我们比以前更多的信息了，这些信息只要你可以看到，我们是都有接口读取到的。?

以ESRI官网的服务为例：?

界面如下图：?

如果细心对比的话，会发现比前几个版本的信息量多了很多，例如：Tables?
再看一下对每个图层的信息描述，如下图：?

?
这里会很明显的发现drawinfo这个属性，记录着图层的图层样式，动态获取图层样式就要靠drawinfo这个属性了。?
代码如下：?
<?xml?version="1.0"?encoding="utf-8"?>??

<s:Application?xmlns:fx="http://ns.adobe.com/mxml/2009"???

???????????????xmlns:s="library://ns.adobe.com/flex/spark"???

???????????????xmlns:esri="http://www.esri.com/2008/ags"??

???????????????xmlns:mx="library://ns.adobe.com/flex/mx"???

???????????????creationComplete="application1_creationCompleteHandler(event)"??

???????????????minWidth="955"?minHeight="600">??

????<fx:Script>??

????????<![CDATA[??

????????????import?com.esri.ags.events.DetailsEvent;??

import?com.esri.ags.layers.supportClasses.LayerDetails;??

import?com.esri.ags.renderers.SimpleRenderer;??

import?com.esri.ags.symbols.PictureMarkerSymbol;??

??????????????

import?mx.core.INavigatorContent;??

import?mx.events.FlexEvent;??

import?mx.rpc.events.FaultEvent;??

????????????/**?

?????????????*?动态读取图层图标??

?????????????*?创建完成以后，加载?

?????????????*/???

protected?function?application1_creationCompleteHandler(event:FlexEvent):void??

????????????{??

????????????????for(var?i:int?=?0?;?i<map.layerIds.length;?i++)??

????????????????{??

????????????????????if(map.layers[i]?is?ArcGISDynamicMapServiceLayer)??

????????????????????{??

??????????????????????????

????????????????????????var?pServiceLayer:ArcGISDynamicMapServiceLayer?=?map.layers[i];??

????????????????????????//调用allgetails方式，就相当于再rest方式下的All?Layers?and?Tables???

????????????????????????pServiceLayer.getAllDetails();??

????????????????????????pServiceLayer.addEventListener(DetailsEvent.GET_ALL_DETAILS_COMPLETE?,?onAllDetailsComplete);??

????????????????????????pServiceLayer.addEventListener(FaultEvent.FAULT,?onFault);??

????????????????????}??

????????????????}??

????????????}??

private?function?onAllDetailsComplete(event:DetailsEvent): ????????????????//这里只做了一个图层，不同的点，线，面，需要判断??

????????????????var?p:LayerDetails?=?event.allDetails.layersDetails[0];??

????????????????var?pSimpleRender:SimpleRenderer?=?(SimpleRenderer)(p.drawingInfo.renderer);??

????????????????var?pSymbol:PictureMarkerSymbol?=?(PictureMarkerSymbol)(pSimpleRender.symbol);??

????????????????image.source?=?pSymbol.source;??

//??

private?function?onFault(event:FaultEvent): ????????????????trace("not?ok");??

????????]]>??

????</fx:Script>??

????<fx:Declarations>??

????????<!--?Place?non-visual?elements?(e.g.,?services,?value?objects)?here?-->??

????</fx:Declarations>??

????<!--?用于显示图层的样式的?-->??

????<mx:Image?id="image"?/>??

????<esri:Map?id="map">??

????????<esri:ArcGISDynamicMapServiceLayer?url="http://localhost:8399/arcgis/rest/services/resource/MapServer"/>??

????</esri:Map>??

??????

</s:Application>??