AE開發(fā)實例代碼總結.doc

精品文檔1、AE開發(fā)技術文檔一、數(shù)據(jù)加載問題1、加載個人數(shù)據(jù)庫個人數(shù)據(jù)庫是保存在Access中的數(shù)據(jù)庫。加載方式有兩種：通過名字和通過屬性加載（也許不只是這兩種，AE中實現(xiàn)同一功能可以有多種方式）A、通過設置屬性加載個人數(shù)據(jù)庫首先通過IPropertySet接口 定義要連接數(shù)據(jù)庫的一些相關屬性，在個人數(shù)據(jù)庫中為數(shù)據(jù)庫的路徑，例如：IPropertySet Propset= new PropertySetClass(); Propset.SetProperty(“DATABASE”,”D:testAodatashMapdata.mdb”);當定義完屬性并設置屬性后就可以進行打開數(shù)據(jù)庫的操作了，在ArcEngine開發(fā)中存在IWorkspaceFactory 、IFeatureWorkspace 、IFeatureClass 、IFeatureLayer等幾個常用的用于打開和操作數(shù)據(jù)空間地物的接口。IWorkspaceFactory 是一個用于創(chuàng)建和打開工作空間的接口，它是一個抽象的接口，我們在具體應用時要用對應的工作空間實例化它，如下: IWorkspaceFactory Fact = new AccessWorkspaceFactoryClass (); 如果我們打開的是SDE 數(shù)據(jù)庫就要用 SdeWorkspaceFactoryClass 實例化Fact。當我們完成了工作空間的實例化后就可以根據(jù)上邊設置的屬性打開對應的Access 數(shù)據(jù)庫了。打開方式如下： IFeatureWorkspace Workspace = Fact.Open( Propset,0) as IFeatureWorkspace; 打開Access 工作空間后接下來的事情是做什么了，很簡單，找到對應的地物類，賦給相應的層，通過MapControl 控件添加對應的層，然后刷新地圖。以下為添加某一層的代碼： IFeatureClass Fcls = Workspace.OpenFeatureClass(District);/找到對應的地物類 IFeatureLayer Fly = new FeatureLayerClass();/建立新圖層 Fly.FeatureClass = Fcls; /將地物賦給相應的層MapCtr.Map.AddLayer (Fly);/添加層 MapCtr.ActiveView.Refresh();/刷新地圖 其中District 為地物類的名字，MapCtr 為AE中MapControl 的對象。上邊的通過屬性設置加載數(shù)據(jù)空間的方式還可以用于SDE 數(shù)據(jù)庫，在SDE 數(shù)據(jù)庫加載時會介紹。以下為通過設置屬性加載Access 數(shù)據(jù)庫的完整C#代碼：public void AddAccessDBByPro() IPropertySet Propset = new PropertySetClass(); Propset.SetProperty(DATABASE,D:testAodatashMapData.mdb ); IWorkspaceFactory Fact = new AccessWorkspaceFactoryClass (); IFeatureWorkspace Workspace = Fact.Open(Propset,0) as IFeatureWorkspace; IFeatureClass Fcls = Workspace.OpenFeatureClass (District); IFeatureLayer Fly = new FeatureLayerClass(); Fly.FeatureClass = Fcls; MapCtr.Map.AddLayer(Fly); MapCtr.ActiveView.Refresh(); B、通過數(shù)據(jù)庫名字加載個人數(shù)據(jù)庫public void AddAccessDBByName（）IworkspaceName pWorkspaceName = new WorkspaceNameClass（）；pWorkspaceName.WorkspaceFactoryProgID= “esriDataSourcesGDB.AccessWorkspaceFactory”;pWorkspaceName.PathName =“D:testAodatashMapData.mdb”;IName n=pWorkspaceName as IName；IFeatureWorkspace Workspace= n.Open() as IFeatureWorkspace;IFeatureClass Fcls = Workspace.OpenFeatureClass (District); IFeatureLayer Fly = new FeatureLayerClass(); Fly.FeatureClass = Fcls; MapCtr.Map.AddLayer(Fly); MapCtr.ActiveView.Refresh(); 首先創(chuàng)建一個個人數(shù)據(jù)庫工作空間名，再指定工作空間名的ProgID,以確定打開的是什么類型的工作空間，例如在打開Access個人數(shù)據(jù)庫時，使用下面代碼;IworkspaceName pWorkspaceName = new WorkspaceNameClass（）；pWorkspaceName.WorkspaceFactoryProgID= “esriDataSourcesGDB.AccessWorkspaceFactory”;pWorkspaceName.PathName =“D:testAodatashMapData.mdb”;屬性WorkspaceFactoryProgID可以確保工作空間是AccessWorkspaceFactory，即個人數(shù)據(jù)庫，同時要指定打開數(shù)據(jù)庫路徑。為了打開數(shù)據(jù)庫，打開工作空間必須使用IName接口（思考有沒有其他辦法），所以接著定義IName、對象，并把工作空間名轉換成IName類型，并賦值給IName對象，然后通過IName對象的open方法打開相應的工作空間，代碼如下：IName n=pWorkspaceName as IName；IFeatureWorkspace Workspace= n.Open() as IFeatureWorkspace;2、AE開發(fā)編輯功能數(shù)據(jù)編輯問題1. 需要了解的概念長事務 短事務 編輯空間 抽象類，類，和組件對象類2、最基本的添加點線面功能添加點（方法有多種，基本思路一樣，只是少量的接口有變化）通過FeatureClass的CreatFeature函數(shù)來添加地物。public void AddPointByStore（）/得到要添加地物的圖層IFeatureLayer l=MapCtr.Map.get_Layer(0) as IFeatureLayer;/定義一個地物類，把要編輯的圖層轉化為定義的地物類IFeatureClass fc= l.FeatureClass;/先定義一個編輯的工作空間，然后把它轉化為數(shù)據(jù)集，最后轉化為編輯工作空間,IWorkspaceEdit w=(fc as IDataset).Workspace as IWorkspaceEdit;IFeature f;IPoint p;/開始事務操作w.StartEditing(false); /?/開始編輯w.StartEditOperation();for(int i=0;i 0) axMapControl2.Map = new MapClass();for (int i = 0; i 0) if (e.button = 1) IPoint pPoint = new PointClass();pPoint.PutCoords(e.mapX， e.mapY); axMapControl1.CenterAt(pPoint); axMapControl1.ActiveView.PartialRefresh(esriViewDrawPhase.esriViewGeography， null， null); else if (e.button = 2) IEnvelope pEnv = axMapControl2.TrackRectangle(); axMapControl1.Extent = pEnv; axMapControl1.ActiveView.PartialRefresh(esriViewDrawPhase.esriViewGeography， null， null); 二、 顯示屬性表的信息我們知道ArcMap中的Table of Contents有很多功能，如下圖：而ArcGIS Engine提供的TOCControl控件幾乎沒有提供，那么這些都是需要自己開發(fā)的，在這里我做一個顯示屬性表的功能。分析：要顯示某一個圖層的屬性表，首先要將這個圖層選中，然后在另外一個Form中將選中的這個圖層的屬性信息進行顯示。方法：添加一個上下文菜單，添加一個新的Form窗體，在這個新的窗體上添加GridView控件，并在TOCControl控件的OnMouseDown事件下添加如下代碼（pGlobalFeatureLayer是我定義的一個全局變量）：private void axTOCControl1_OnMouseDown(object sender， ESRI.ArcGIS.Controls.ITOCControlEvents_OnMouseDownEvent e) if (axMapControl1.LayerCount 0) esriTOCControlItem pItem = new esriTOCControlItem(); pGlobalFeatureLayer = new FeatureLayerClass(); IBasicMap pBasicMap = new MapClass(); object pOther = new object();object pIndex = new object(); axTOCControl1.HitTest(e.x， e.y， ref pItem， ref pBasicMap， ref pGlobalFeatureLayer， ref pOther， ref pIndex); if (e.button = 2) context.Show(axTOCControl1， e.x， e.y); 在上下文菜單的打開屬性表的Click事件中添加如下代碼： private void 打開屬性表ToolStripMenuItem_Click(object sender， EventArgs e) FormTable Ft = new FormTable(pGlobalFeatureLayer as IFeatureLayer); Ft.Show(); 在新的窗體中添加一個將屬性表顯示到GridView控件中的函數(shù)，如下： public void Itable2Dtable() IFields pFields; pFields = pFeatureLayer.FeatureClass.Fields; dtGridView.ColumnCount = pFields.FieldCount; for (int i = 0; i pFields.FieldCount;i+ ) string fldName = pFields.get_Field(i).Name; dtGridView.Columnsi.Name = fldName; dtGridView.Columnsi.ValueType = System.Type.GetType(ParseFieldType(pFields.get_Field(i).Type); IFeatureCursor pFeatureCursor;pFeatureCursor = pFeatureLayer.FeatureClass.Search(null， false); IFeature pFeature; pFeature = pFeatureCursor.NextFeature(); while (pFeature != null) string fldValue = new stringpFields.FieldCount; for (int i = 0; i pFields.FieldCount; i+) string fldName; fldName = pFields.get_Field(i).Name; if (fldName=pFeatureLayer .FeatureClass .ShapeFieldName) fldValuei = Convert.ToString(pFeature.Shape.GeometryType); else fldValuei = Convert.ToString(pFeature.get_Value(i); dtGridView.Rows.Add(fldValue); pFeature = pFeatureCursor.NextFeature(); 數(shù)據(jù)庫知識：DB2、Informix、PostgreSQL數(shù)據(jù)庫打開方式以及方法：1、 打開個人數(shù)據(jù)庫：public IWorkspace GetMDBWorkspace(String _pGDBName) IWorkspaceFactory pWsFac = new AccessWorkspaceFactoryClass(); IWorkspace pWs = pWsFac.OpenFromFile(_pGDBName，0);return pWs; 2、 打開文件數(shù)據(jù)庫：public IWorkspace GetFGDBWorkspace(String _pGDBName) IWorkspaceFactory pWsFac = new FileGDBWorkspaceFactoryClass(); IWorkspace pWs = pWsFac.OpenFromFile(_pGDBName， 0); return pWs; 3、 打開SDE數(shù)據(jù)庫：打開SDE數(shù)據(jù)庫我們使用的是Open方法，要用這個方法，我們就要對IPropertySet對象設置，要打開SDE數(shù)據(jù)庫，我們要獲取SDE數(shù)據(jù)庫的服務器地址，數(shù)據(jù)庫實例，數(shù)據(jù)庫，用戶，密碼等參數(shù)。而IPropertySet就好比一個Key-Value的對象，用來幫組我們設置這些，然后傳到Open方法中。public IWorkspace GetSDEWorkspace(String _pServerIP， String _pInstance， String _pUser， String _pPassword， String _pDatabase， String _pVersion) ESRI.ArcGIS.esriSystem.IPropertySet pPropertySet = new ESRI.ArcGIS.esriSystem.PropertySetClass(); pPropertySet.SetProperty(SERVER， _pServerIP); pPropertySet.SetProperty(INSTANCE， _pInstance); pPropertySet.SetProperty(DATABASE， _pDatabase); pPropertySet.SetProperty(USER， _pUser); pPropertySet.SetProperty(PASSWORD， _pPassword); pPropertySet.SetProperty(VERSION， _pVersion); ESRI.ArcGIS.Geodatabase.IWorkspaceFactory2 workspaceFactory; workspaceFactory = (ESRI.ArcGIS.Geodatabase.IWorkspaceFactory2)new ESRI.ArcGIS.DataSourcesGDB.SdeWorkspaceFactoryClass(); return workspaceFactory.Open(pPropertySet， 0); 注意，打開SDE數(shù)據(jù)庫需要用到ArcGIS Engine運行時的企業(yè)級許可。（即此時的License需要特別設置ArcEngine的Lisence應使用企業(yè)數(shù)據(jù)庫類型，在From1_Load事件中初始化lisence，不能使用lisence控件設置，否則提示沒有許可lisence。）具體的解決代碼如下：private void From1_Load(object sender,EventArg e)IAoInitialize pao=new AoInitializeClass();pao.Initialize(esriLisenceProductCode.esriLisenceProductCodeEngineGeoDB);4.4.2 獲取數(shù)據(jù)庫中的要素類 在ArcGIS Engine中，要得到某一個類，首要要獲取工作空間，然后進入工作空間再得到相應的東西，也就是以下兩個步驟： l 獲取工作空間； l 獲取相應的要素類。 我們定義一個函數(shù)用來獲取個人數(shù)據(jù)庫的路徑public string WsPath() string WsFileName=; OpenFileDialog OpenFile = new OpenFileDialog(); OpenFile.Filter = 個人數(shù)據(jù)庫(MDB)|*.mdb; DialogResult DialogR = OpenFile.ShowDialog(); if (DialogR = DialogResult.Cancel) else WsFileName = OpenFile.FileName; return WsFileName; 要獲取要素類，首先獲取工作空間，然后對工作空間中的要素類進行遍歷，代碼如下： private void button2_Click(object sender， EventArgs e) string WsName = WsPath(); if (WsName != ) IWorkspaceFactory pWsFt = new AccessWorkspaceFactoryClass(); IWorkspace pWs = pWsFt.OpenFromFile(WsName， 0); IEnumDataset pEDataset =pWs.get_Datasets(esriDatasetType.esriDTAny);IDataset pDataset = pEDataset.Next(); while (pDataset != null) if (pDataset.Type =esriDatasetType.esriDTFeatureClass) FeatureClassBox.Items.Add(pDataset.Name); /如果是數(shù)據(jù)集 else if (pDataset.Type = esriDatasetType.esriDTFeatureDataset) IEnumDataset pESubDataset = pDataset.Subsets; IDataset pSubDataset = pESubDataset.Next(); while (pSubDataset != null) FeatureClassBox.Items.Add(pSubDataset.Name);/ -這是從哪里來的？-pSubDataset = pESubDataset.Next(); pDataset = pEDataset.Next(); FeatureClassBox.Text = FeatureClassBox.Items0.ToString(); 判斷要素是否被編輯：ArcGIS Engine 提供了一個IDatasetEdit的接口用來判斷我們的數(shù)據(jù)是否處于編輯狀態(tài)，該接口只有一個方法，如下：示例代碼如下：public bool ISEdit (IFeatureClass pFeatureClass) IDatasetEdit pDataEdit = pFeatureClass as IDatasetEdit; return pDataEdit.IsBeingEdited(); 如何刪除要素類：IFeatureWorkspace這個接口主要是用于管理基于矢量數(shù)據(jù)的，如表，要素類，要素數(shù)據(jù)集等。要想刪除一個要素類，那么必須先得到這個。，如要打開一個名稱為PointTest的要素類，只需要在OpenFeatureClass中傳入這個要素類的名稱，代碼如下： IWorkspaceFactory pWsFt = new AccessWorkspaceFactoryClass(); IWorkspace pWs = pWsFt.OpenFromFile(WsName， 0); IFeatureWorkspace pFWs = pWs as IFeatureWorkspace; IFeatureClass pFClass = pFWs.OpenFeatureClass(PointTest);如果是在ArcMap中，我們會切換到Catalog中然后進入相應的數(shù)據(jù)庫，然后刪除相應的要素類，這種操作會讓我們想到FeatureClas這個對象會提供刪除的方法，其實不然，這個刪除的方法是定義在Dataset這個對象中。 private void button1_Click(object sender， EventArgs e) string WsName = WsPath(); if( WsName !=) IWorkspaceFactory pWsFt = new AccessWorkspaceFactoryClass(); IWorkspace pWs = pWsFt.OpenFromFile(WsName， 0); IFeatureWorkspace pFWs = pWs as IFeatureWorkspace; IFeatureClass pFClass = pFWs.OpenFeatureClass(PointTest);IDataset pDatset = pFClass as IDataset; pDatset.Delete(); 刪除前：刪除后：創(chuàng)建要素類創(chuàng)建要素類用到了IFeatureWorkspace.CreateFeatureClass方法。所需接口：IField，IFieldEdit，IFields，IFieldsEdit，IGeometryDef，IGeometryDefEdit接口（注意 在NET中，會遇到以“_2”結尾的屬性，這些屬性是可寫的。）/定義一個幾何字段，類型為點類型 ISpatialReference pSpatialReference = axMapControl1.ActiveView.FocusMap.SpatialReference; IGeometryDefEdit pGeoDef = new GeometryDefClass(); IGeometryDefEdit pGeoDefEdit = pGeoDef as IGeometryDefEdit; pGeoDefEdit.GeometryType_2 = esriGeometryType.esriGeometryPoint; pGeoDefEdit.SpatialReference_2 = pSpatialReference;/定義一個字段集合對象 IFields pFields = new FieldsClass(); IFieldsEdit pFieldsEdit = (IFieldsEdit)pFields; /定義單個的字段 IField pField = new FieldClass(); IFieldEdit pFieldEdit = (IFieldEdit)pField; pFieldEdit.Name_2 = SHAPE; pFieldEdit.Type_2 = esriFieldType.esriFieldTypeGeometry; pFieldsEdit.AddField(pField); pFieldEdit.GeometryDef_2 = pGeoDef; /定義單個的字段，并添加到字段集合中 pField = new FieldClass(); pFieldEdit = (IFieldEdit)pField; pFieldEdit.Name_2 = STCD; pFieldEdit.Type_2 = esriFieldType.esriFieldTypeString; pFieldsEdit.AddField(pField); /定義單個的字段，并添加到字段集合中pField = new FieldClass(); pFieldEdit = (IFieldEdit)pField; pFieldEdit.Name_2 = SLM10; pFieldEdit.Type_2 = esriFieldType.esriFieldTypeString; pFieldsEdit.AddField(pField); /定義單個的字段，并添加到字段集合中 pField = new FieldClass(); pFieldEdit = (IFieldEdit)pField; pFieldEdit.Name_2 = SLM20; pFieldEdit.Type_2 = esriFieldType.esriFieldTypeString; pFieldsEdit.AddField(pField); /定義單個的字段，并添加到字段集合中 pField = new FieldClass(); pFieldEdit = (IFieldEdit)pField; pFieldEdit.Name_2 = SLM40; pFieldEdit.Type_2 = esriFieldType.esriFieldTypeString; pFieldsEdit.AddField(pField); IWorkspaceFactory pFtWsFct = new AccessWorkspaceFactory();IFeatureWorkspace pWs = pFtWsFct.OpenFromFile(E:arcgisEngines.mdb， 0) as IFeatureWorkspace;IFeatureClass pFtClass = pWs.CreateFeatureClass(Test， pFields， null， null， esriFeatureType.esriFTSimple， SHAPE， null)/?如何改變字段的別名？public void ChangeFieldAliasName(ITable pTable， string pOriFieldName， string pDesFieldName) IClassSchemaEdit pClassSchemaEdit = (IClassSchemaEdit)pTable; /給對象加上鎖 ISchemaLock pSchemaLock = (ISchemaLock)pTable; pSchemaLock.ChangeSchemaLock(esriSchemaLock.esriExclusiveSchemaLock); if (pTable.FindField(pOriFieldName) != -1) pClassSchemaEdit.AlterFieldAliasName(pOriFieldName， pDesFieldName); pSchemaLock.ChangeSchemaLock(esriSchemaLock.esriSharedSchemaLock);使用IFeatureSelection接口高亮顯示在介紹IMap接口那一節(jié)，我們用IMap的IMap.SelectFeature方法實現(xiàn)了對查詢的要素高亮顯示，現(xiàn)在我們用IFeatureSelection接口實現(xiàn)查詢高亮顯示IMap pMap = axMapControl1.Map; IFeatureLayer pFeaturelayer = GetLayer(pMap， Roads) as IFeatureLayer; IFeatureSelection pFeatureSelection = pFeaturelayer as IFeatureSelection; IQueryFilter pQuery = new QueryFilterClass(); pQuery.WhereClause = TYPE= +paved; pFeatureSelection.SelectFeatures(pQuery，esriSelectionResultEnum.esriSelectionResultNew，false); axMapControl1.ActiveView.Refresh();其中GetLayer函數(shù)是我們寫的一個根據(jù)圖層的名稱獲取圖層的方法，代碼如下private ILayer GetLayer(IMap pMap， string LayerName) IEnumLayer pEnunLayer; pEnunLayer = pMap.get_Layers(null， false); pEnunLayer.Reset(); ILayer pRetureLayer; pRetureLayer = pEnunLayer.Next(); while (pRetureLayer != null) if (pRetureLayer.Name = LayerName) break; pRetureLayer = pEnunLayer.Next(); return pRetureLayer; 提問：以下三種方式的區(qū)別在哪里？axMapControl1.Refresh(esriViewDrawPhase.esriViewGeoSelection, null, null);axMapControl1.ActiveView.Refresh();axMapControl1.Refresh();創(chuàng)建符合要求的表：public ITable CreateTable(string _TablePath， string _TableName) IWorkspaceFactory pWks = new ShapefileWorkspaceFactoryClass(); IFeatureWorkspace pFwk = pWks.OpenFromFile(_TablePath， 0) as IFeatureWorkspace; /用于記