图层中的常用编辑语句
<summary>
/// 添加图层到Mxd文件
/// </summary>
/// <param name="serverContext">IServerContext</param>
/// <param name="nfc">新图层对应的要素集</param>
/// <param name="groupIndex">复合图层的序号</param>
/// <param name="mxdPath">mxd所在的路径</param>
/// <param name="picPath">用于对图层渲染的图片</param>
/// <returns></returns>
public string addLayerInMxd(IServerContext serverContext, IFeatureClass nfc, int groupIndex, string mxdPath,string picPath)
{
IMapServer pMapServer = serverContext.ServerObject as IMapServer;
IMapServerObjects pMapServerObjs = pMapServer as IMapServerObjects;
IMap pMap = pMapServerObjs.get_Map(pMapServer.DefaultMapName);
bool hasLayer = hasTheLayer(pMap, nfc.AliasName);
if (hasLayer) return "已存在该命名图层,操作未能完成"; //如果图层已经存在了，那就不添加
if (groupIndex >= pMap.LayerCount) return "组合图层序号越界,操作未能完成";
IMapLayers mapLayer = pMap as IMapLayers;
IGroupLayer gLayer = pMap.get_Layer(groupIndex) as IGroupLayer;
IFeatureLayer fl = serverContext.CreateObject("esriCarto.FeatureLayer") as IFeatureLayer;
fl.FeatureClass = nfc;
fl.Name = nfc.AliasName;
//设置样式
ISimpleRenderer pRen = serverContext.CreateObject("esriCarto.SimpleRenderer") as ISimpleRenderer;
IGeoFeatureLayer pGeoLayer = fl as IGeoFeatureLayer;
IPictureMarkerSymbol picMark = serverContext.CreateObject("esriDisplay.PictureMarkerSymbol") as IPictureMarkerSymbol;
picMark.Size = 20;
picMark.CreateMarkerSymbolFromFile(esriIPictureType.esriIPictureBitmap, picPath);
pRen.Symbol = (ISymbol)picMark;
pGeoLayer.Renderer = (IFeatureRenderer)pRen;
mapLayer.InsertLayerInGroup(gLayer, pGeoLayer as ILayer, false, 3);
//获取pMapDocument对象
IMxdContents pMxdC;
pMxdC = pMap as IMxdContents;
IMapDocument pMapDocument = serverContext.CreateObject("esriCarto.MapDocument") as IMapDocument;
pMapDocument.Open(mxdPath, "");
pMapDocument.ReplaceContents(pMxdC);
if (pMapDocument == null) return "文档为空不能完成操作";
//检查地图文档是否是只读
if (pMapDocument.get_IsReadOnly(mxdPath) == true)
{
return "地图文档只读，未能完成操作";
}
//根据相对的路径保存地图文档
pMapDocument.Save(pMapDocument.UsesRelativePaths, false);
return "操作成功";
}
/// <summary>
/// 是否存在layerName为别名的图层
/// </summary>
/// <param name="pMap"></param>
/// <param name="layerName"></param>
/// <returns></returns>
public bool hasTheLayer(IMap pMap, string layerName)
{
for (int i = 0; i < pMap.LayerCount; i++)
{
ILayer pLayer = pMap.get_Layer(i);
if (pLayer.Name == layerName)
return true;
if (pLayer is ICompositeLayer)
{
ICompositeLayer comLayer = pLayer as ICompositeLayer;
for (int j = 0; j < comLayer.Count; j++)
{
ILayer cLayer = comLayer.get_Layer(j);
if (cLayer.Name == layerName)
return true;
}
}
}
return false;
}
下面是根据图层名删除图层的操作
public string removeLayerFromMxd(IServerContext serverContext, layerName,string mxdPath)
{
IMapServer pMapServer = serverContext.ServerObject as IMapServer;
IMapServerObjects pMapServerObjs = pMapServer as IMapServerObjects;
IMap pMap = pMapServerObjs.get_Map(pMapServer.DefaultMapName);
IMapLayers pMapLayers = pMap as IMapLayers;
ILayer removeLayer = getLayerByName(serverContext, layerName);
if (removeLayer == null)
return "操作失败,找不到要删除的图层";
pMapLayers.DeleteLayer(removeLayer);
//获取pMapDocument对象
IMxdContents pMxdC = pMap as IMxdContents; ;
IMapDocument pMapDocument = serverContext.CreateObject("esriCarto.MapDocument") as IMapDocument;
pMapDocument.Open(mxdPath, "");
pMapDocument.ReplaceContents(pMxdC);
if (pMapDocument == null) return "操作失败,地图文档为空";
//检查地图文档是否是只读
if (pMapDocument.get_IsReadOnly(mxdPath) == true)
{
return "操作失败,地图文档只读";
}
//根据相对的路径保存地图文档
pMapDocument.Save(pMapDocument.UsesRelativePaths, false);
return "操作成功";
}
/// <summary>
/// 是否存在layerName为别名的图层
/// </summary>
/// <param name="pMap"></param>
/// <param name="layerName"></param>
/// <returns></returns>
public bool hasTheLayer(IMap pMap, string layerName)
{
for (int i = 0; i < pMap.LayerCount; i++)
{
ILayer pLayer = pMap.get_Layer(i);
if (pLayer.Name == layerName)
return true;
if (pLayer is ICompositeLayer)
{
ICompositeLayer comLayer = pLayer as ICompositeLayer;
for (int j = 0; j < comLayer.Count; j++)
{
ILayer cLayer = comLayer.get_Layer(j);
if (cLayer.Name == layerName)
return true;
}
}
}
return false;
}
从上面的函数可看出，对添加删除图层这些操作，步骤大概就是 获取图层对要素集，设置图层样式，打开当前地图，插入图层，保存Mxd，
所有的这些都是AO的操作，对于习惯使用AE的人来说，这些都很熟悉，唯一不同的是，Server不能用new去创建对象，细心人会发现在创建
地图文档的时候，使用的是CreateObject的方式，如下面语句
IMapDocument pMapDocument = serverContext.CreateObject("esriCarto.MapDocument") as IMapDocument;
当然，通过代码对服务器文件进行读写，还必须要注意网络的安全设置。
首先要确保有足够的权限对Mxd进行修改。
懒羊羊要指出，所谓的权限，第一是确保你的Server具有足够的授权。第二，服务器文件必须有足够的写入权限。
对于第二点，主要是考虑磁盘格式。网络开发人员都知道，NTFS格式下面，要访问文件，必须设置安全属性。
设置方法如下。
1。在服务器Mxd文件右键属性--点击"安全"标签
2.查找soc用户
3.给soc用户写入的权限。
懒羊羊这里只是举个例子，看官们只管使用自己的soc用户就行了。
如果是fat格式就不用上述设置，毕竟NTFS格式安全系数比较高。至于Linux，懒羊羊没有做过，尝试过的朋友可以发表一下心得体会
还有一点必须主要的，Mxd更改以后，地图服务是没有发生变化的，所发布的地图一直驻留在内存中。因此，这时候需要更新一下地图服务。
方法有很多，最傻瓜最直接的方法就是跑到机房去重启mxd所对应的service。但是，懒羊羊比较懒，所以，还是希望通过代码去控制，update
一下。下面是更新地图服务的函数
private void updateService(string serviceName,string serverName)
{
ServerConnection pServerConnection = new ESRI.ArcGIS.Server.WebControls.ServerConnection(serverName);//地图服务机器名
pServerConnection.Connect();
IServerObjectAdmin pServerSOA = pServerConnection.ServerObjectAdmin;
IServerObjectConfiguration pConfig = pServerSOA.GetConfiguration(serviceName, "MapServer");
pServerSOA.UpdateConfiguration(pConfig);
}
细心的朋友应该注意到了，这里面主要是使用了IServerObjectAdmin 接口，IServerObjectAdmin 接口功能十分强大，建议去查一下帮助，
对其加深了解。
实际上，上述的操大多数都是常规的操作，AE程序员都能轻松搞定。但细微的地方还是要注意的，例如Server环境下创建新对象，文件的权限设置等等
对server的一些特性也必须了解。例如mxd更新以后必须重启服务，确保当前服务与地图文档一致，不然就可能导致灾难性的出错。
前面漏掉的一个函数现在补上
/// <summary>
/// 通过图层名称返回图层
/// </summary>
/// <param name="pSOC">地图控件</param>
/// <param name="LayerName">图层名称</param>
/// <returns></returns>
public static ILayer getLayerByName(IServerContext pSOC, string LayerName)
{
IMapServer pMapServer = pSOC.ServerObject as IMapServer;
IMapServerObjects pMapServerObjs = pMapServer as IMapServerObjects;
IMap pMap = pMapServerObjs.get_Map(pMapServer.DefaultMapName);
//获取所有的图层
for (int i = 0; i < pMap.LayerCount; i++)
{
ILayer lyr = pMap.get_Layer(i);
if (lyr.Name == LayerName)
{
return lyr;
}
else if (lyr is ICompositeLayer)
{
//图层为复合图层，查找其子图层
ICompositeLayer comLayer = lyr as ICompositeLayer;
for (int j = 0; j < comLayer.Count; j++)
{
ILayer cLayer = comLayer.get_Layer(j);
if (cLayer.Name == layerName)
return cLayer;
}
}
}
return null;
}
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arcgis api for flex 开发入门（八）GP服务的使用
arcgis api for flex 开发入门（八）GP服务的使用
在arcgis api for flex中esri还为我们提供了GP服务，在ARCGISONLINE 上的gp
服务有CreateDriveTimePolygons和Viewshed，下面我们以
CreateDriveTimePolygons服务为例来看看在arcgis api for flex中如何使用GP
服务。
首先使用 <esri:Geoprocessor >标签创建一个gp服务，url指向提供gp服务的
地址。
<esri:Geoprocessor id="gp"
url="http://sampleserver1.arcgisonline.com/ArcGIS/rest/services/Network
/ESRI_DriveTime_US/GPServer/CreateDriveTimePolygons" />
剩下的步骤和上一讲Geometry service的使用基本相同，即设置参数，调用gp服
务，得到结果，表现结果。
我们直接看一下下面的代码和例子就ok了，这个例子比较简单。
<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
pageTitle="Service Area"
xmlns:esri="http://www.esri.com/2008/ags"
layout="absolute"
>
<mx:Script>
<![CDATA[
// Synopsis:
// The map has a click event that calls computeServiceArea
(event) when you click the map
// <esri:Map click="computeServiceArea(event)">
// The computeServiceArea function sends a request to a GP
task to create the geometries for the different drive times
// The return drivetime features are used as the
graphicProvider for a graphics layer.
// graphicsLayer.graphicProvider = fs.features;
// The graphics layer is using a symbolFunction which will
symbolize the drivetimes in different colors
// <esri:GraphicsLayer id="graphicsLayer"
symbolFunction="fillFunc"/>
// The fillFunc() is using the "ToBreak" attributes, which
the GP task returned, to set different symbols on different drive
times.
import com.esri.ags.Graphic;
import com.esri.ags.symbol.Symbol;
import com.esri.ags.tasks.ExecuteResult;
import com.esri.ags.tasks.FeatureSet;
import com.esri.ags.tasks.ParameterValue;
import com.esri.ags.geometry.MapPoint;
import com.esri.ags.geometry.Geometry;
import mx.controls.Alert;
import mx.rpc.AsyncResponder;
import mx.utils.ObjectUtil;
private var driveTimes:String = "1 2 3";
private function computeServiceArea( event : MouseEvent ) :
void
{
graphicsLayer.clear();
var mapPoint : MapPoint = myMap.toMapFromStage
(event.stageX, event.stageY);
var graphic : Graphic = new Graphic(mapPoint,
sms_circleAlphaSizeOutline);
graphicsLayer.add(graphic);
var featureSet:FeatureSet = new FeatureSet([graphic]);
var params:Object = {
"Input_Location" : featureSet,
"Drive_Times" : driveTimes
};
gp.execute(params, new AsyncResponder( onResult,
onFault ));
function onResult(
gpResult : ExecuteResult,
token : Object = null
) : void
{
var pv : ParameterValue = gpResult.parameterValues
[0];
var fs : FeatureSet = pv.value as FeatureSet;
graphicsLayer.graphicProvider = fs.features;
}
function onFault( info : Object, token : Object = null
) : void
{
Alert.show( info.toString() );
}
}
private function fillFunc( g : Graphic ) : Symbol
{
var toBreak : Number = g.attributes.ToBreak;
if ( toBreak == 1 )
{
return rFill;
}
if ( toBreak == 2 )
{
return gFill;
}
return bFill;
}
]]>
</mx:Script>
<esri:SimpleMarkerSymbol id="sms_circleAlphaSizeOutline"
alpha="0.5" size="15" style="circle"/>
<esri:SimpleFillSymbol id="rFill" alpha="0.5" color="0xFF0000"/>
<esri:SimpleFillSymbol id="gFill" alpha="0.5" color="0x00FF00"/>
<esri:SimpleFillSymbol id="bFill" alpha="0.5" color="0x0000FF"/>
<esri:Map id="myMap" click="computeServiceArea(event)"
openHandCursorVisible="false">
<esri:extent>
<esri:Extent xmin="-95.41" ymin="38.86" xmax="-95.1"
ymax="39.06"/>
</esri:extent>
<esri:ArcGISTiledMapServiceLayer
url="http://server.arcgisonline.com/ArcGIS/rest/services/ESRI_StreetMap
_World_2D/MapServer"/>
<esri:GraphicsLayer id="graphicsLayer"
symbolFunction="fillFunc"/>
</esri:Map>
<esri:Geoprocessor
id="gp"
url="http://sampleserver1.arcgisonline.com/ArcGIS/rest/services/Network
/ESRI_DriveTime_US/GPServer/CreateDriveTimePolygons"
/>
</mx:Application>
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