1、ArcGIS接口详细说明之个人开发心1ArcGIS接口详细说明之个人开发心得1. 关于IField接口(esriGeoDatabase)2. 关于IFieldEdit接口(esriGeoDatabase)3. 关于IFields接口(esriGeoDatabase)4. 关于IPoint接口(esriGeometry)5. 关于IPointArray接口(esriGeometry)6. 关于IPointCollection接口(esriGeometry) 7. 关于IPolyline接口(esriGeometry)8. 关于IGeometry接口(esriGeometry)9. 关于IArea
2、接口(esriGeometry)10. 关于IEnvelope接口(esriGeometry)11. 关于IFeature接口(esriGeoDatabase)12. 关于IRow接口(esriGeoDatabase)13. 关于IFeatureClass接口(esriGeoDatabase)14. 关于ITable接口(esriGeoDatabase)15. 关于IFeatureCursor接口(esriGeoDatabase)16. 关于IQueryFilter接口(esriGeoDatabase)17. 关于IFeatureLayer接口(esriCarto)18. 关于IFeature
3、Selection接口(esriCarto)19. 关于IMap接口(esriCarto) 20. 关于IPropertySet接口(esriSystem) 21. 关于IFeatureWorkspace接口(esriGeoDatabase)22. 关于IWorkspaceEdit接口(esriGeoDatabase)23. 关于IWorkspaceFactory接口(esriGeoDatabase)24. 关于ITopologicalOperator接口(esriGeometry)25. 创建Buffer并选择里面的要素 26. Merge要素Union要素27. 怎样从Table中获取具体
4、需求值的Row 28. 怎样ZoomInCenter 29. 怎样读取一个字段内的所有值 30. 怎样编辑更改属性字段的值 31. 怎样将MapControl中的Map复制到PageLayoutControl中 32. 怎样判断是否出于编辑状态 33. 怎样用点创建一个Polygon 34. 怎样运用属性来计算总面积 35. 关于属性域的一些心得 36. 怎样实现翻折Flip方法 37. 回答cumtbGIS关于ITopologicalOperator接口Clip方法的问题 38. 回答机器猫FJJ关于ISpatialFilter接口方法的问题(完整函数) 39. 回答网友韶华响当当关于更改符
5、号的代码(完整函数) 40. 回答网友韶华响当当关于显示属性的代码(完整函数) 1. 关于IField接口(esriGeoDatabase)IField接口的第一个属性AliasName(只读,获得字段的别名)IField接口的第二个方法CheckValue(Value)(方法,对于指定的属性字段,基于字段类型判断参数值是否有效,有效,则返回True,否则返回False)例子代码: Get FieldSet pField = pFields.Field(6) bChkField = pField.CheckValue(45.86) If bChkField = True ThenAdd dat
6、a to selected rows for the field selected.End If复制代码IField接口的其他属性均为只读属性,常用有Name(只读,获得字段的名称)例子代码: Dim pFields As IFieldsDim pField As IFieldDim pGeoDef As IGeometryDefDim pDomain As IDomainDim i As LongSet pFields = pFeatClass.FieldsFor i = 0 To pFields.FieldCount - 1Set pField = pFields.Field(i)If p
7、Field.Type = esriFieldTypeGeometry Then Set pGeoDef = pField.GeometryDefElse Debug.Print pField.AliasName Debug.Print pField.DefaultValue Set pDomain = pField.Domain Debug.Print pField.Editable Debug.Print pField.IsNullable Debug.Print pField.Length Debug.Print pField.Name Debug.Print pField.Precisi
8、on Debug.Print pField.Required Debug.Print pField.Scale Debug.Print pField.Type Debug.Print pField.VarTypeEnd IfNext2. 关于IFieldEdit接口(esriGeoDatabase)所有该接口的属性均为可读可写,经常用与对新建字段的设置,因为字段一旦被设置,其基本属性就不能被更改,所以就需要该接口类型的变量去转换,方法为:IFeatureClass pFC_SCP_PT;IFieldEdit editPT = new FieldClass();pFC_SCP_PT.AddFie
9、ld(IField)editPT);如果在vb中去编写代码,则赋值和获取均为同一属性,而在C#中,为了区分设置和获取,属性均有两个,类似于Name和Name_2,这样就可以区分了,普遍用设置的带有_2的那个属性。IFieldEdit接口的第一个属性Name (读写,设置或者获取该变量类型变量字段的名称)IFieldEdit接口的第二个属性Precision(读写,设置或者获取该变量类型变量字段的长度)IFieldEdit接口的第三个属性Scale(读写,设置或者获取该变量类型变量字段的精度)IFieldEdit接口的第四个属性Type(读写,设置或者获取该变量类型变量字段的类型)例子代码: I
10、FeatureClass pFC_SCP_PT;editPT = new FieldClass();editPT.Precision_2 = 8;editPT.Scale_2 = 3;editPT.Name_2 = ELEV1;editPT.Type_2 = esriFieldType.esriFieldTypeDouble;3. 关于IFields接口(esriGeoDatabase)IFields接口的第一个属性Field(Index) (只读,以用于获取具体的字段,返回类型为IField)IFields接口的第二个属性FieldCount(只读,以用于获取属性的数量)利用上面两个接口并用
11、索引去依次循环获得每一列的属性pField(Ifield接口)例子代码: Dim i As LongDim pField As IFieldFor i = 0 To (pFields.FieldCount - 1) Set pField = pFields.Field(i) Debug.Print pField.Name & : & pField.TypeNext i复制代码IFields接口的第三个方法FindField(Name)(方法,输入想要查找的属性域字段的名称,如果有,则返回该属性域字段在此Fields的索引,没有则返回-1)例子代码: Dim i As IntegerDim pF
12、ields As IFieldsDim pField As IFieldGet FieldsSet pFields = pFeatClass.FieldsFind the field named average_incomei = pFields.FindField(average_income)Set the current fieldSet pField = pFields.Field(i)Delete field from featureclasspFeatClass.DeleteField pField复制代码IFields接口的第四个方法FindFieldByAliasName(Na
13、me)(方法,与第三个方法类似,此时输入的为该列属性字段的别名,此方法不经常用)例子代码: Dim i As IntegerDim pFields As IFieldsDim pField As IFieldGet FieldsSet pFields = pFeatClass.Fields Find the field with the aliasname current populationi = pFields.FindFieldByAliasName(current population)Set the current fieldSet pField = pFields.Field(i)
14、Delete field from featureclasspFeatClass.DeleteField pField4. 关于IPoint接口(esriGeometry)IPoint接口的第一个方法PutCoords(X,Y)(方法,设置该点的坐标)或者直接调用可以读写的属性X和Y,将坐标赋值给X和Y例子代码: Dim pPoint As IPointSet pPoint = New PointpPoint.PutCoords 100, 100复制代码IPoint接口的第二个方法QueryCoords(X,Y) (方法,得到该点的坐标)例子代码: Dim pPoint as IPointDi
15、m dX as Double, dY as DoublepPoint.QueryCoords dX, dY复制代码IPoint接口的第三个方法ConstrainAngle (constraintAngle, anchor, allowOpposite ) (方法,如果第三个参数allowOpposite为True,则将第二个参数anchor这个点作为一个原点,然后以第一个参数constraintAngle为与x轴的角度,做一条直线,再将调用此参数的点向该直线做垂线并交于一个新点,并将调用此方法的点移动到该点)例子代码: Finds the closes point to line from (
16、0,0) with anglesdefined by steps of pi/4 (Note all angles in radians) Dim pApoint As IPoint Dim pNpoint As IPoint Dim pi As Double Dim dAngle As Double Dim i As Long Set pApoint = New Point pi = 4 * Atn(1) dAngle = 0 pApoint.PutCoords 0, 0 Set pNpoint = New Point For i = 0 To 7 pNpoint.PutCoords 1,
17、0 dAngle = i * pi / 4 pNpoint.ConstrainAngle dAngle, pApoint, True MsgBox angle = & i & *pi/4 & vbCrLf & pNpoint.X & , & pNpoint.Y Next i复制代码IPoint接口的第四个方法ConstrainDistance (constraintRadius, anchor ) (方法,以第二个参数anchor这个点为圆心,然后以第一个参数constraintRadius为半径做一个圆,将调用此参数的点移动到该点与圆心做线段交于该圆的交点上)例子代码: Public Sub
18、 t_constraindistance() Dim pPoint As IPoint Dim pNPoint As IPoint Dim dRadius As Double Set pPoint = New Point pPoint.PutCoords 0, 0 Set pNPoint = New Point pNPoint.PutCoords 2, 2 dRadius = 1.4142135623731 pNPoint.ConstrainDistance dRadius, pPoint MsgBox Radius = & dRadius & x,y = & pNPoint.X & , &
19、pNPoint.YEnd Sub5. 关于IPointArray接口(esriGeometry)IPointArray接口的第一个方法Add(p) (方法,向该类型的数组变量添加Point)IPointArray接口的第二个属性Count (只读,获得该数组变量中Point的个数,返回Long类型变量)IPointArray接口的第三个属性Element(Index) (只读,获得该数组变量中位于参数Index索引位置的点Point,返回一个Point类型的变量)IPointArray接口的第四个方法Insert (Index, p ) (方法,向索引位置Index插入一个点Point)IPo
20、intArray接口的第五个方法Remove (Index )(方法,移除索引位置Index的点Point)IPointArray接口的第六个方法RemoveAll (方法,移除所有在此数组中的点)6. 关于IPointCollection接口(esriGeometry)IPointCollection接口的第一个方法AddPoint(inPoint ,before ,after) (方法,向该类型的点集变量添加Point,第一个参数为添加的Point,第二个第三个参数为可选择的参数,默认添加进点集的末尾)IPointCollection接口的第二个属性Point(i) (只读,获得该点集变量
21、中第i个位置的Point,返回IPoint类型变量,i从0计算开始)IPointCollection接口的第三个属性PointCount (只读,获得该点集变量中点的个数,返回Long类型变量,切记,如果一个PointCollection变量是由闭合的Geometry转换而来的话,那么点的个数比节点数多一个,因为是闭合的,所以首位节点是同一个点)7. 关于IPolyline接口(esriGeometry)IPolyline接口的第一个属性FromPoint与ToPoint(读写,设置或者读取该点的起始点和终止点,返回都是IPoint类型的变量)IPolyline接口的第二个方法QueryFro
22、mPoint (from )(方法,返回IPoint类型的变量到参数from)IPolyline接口的第三个方法QueryToPoint (to ) (方法,返回IPoint类型的变量到参数to) Public Sub t_ICurve_QueryPoints() Dim pID As New UID pID = esriEditor.editor Dim pEditor As IEditor Dim pApp As IApplication Set pApp = MxApplication Set pEditor = pApp.FindExtensionByCLSID(pID) If pEd
23、itor.SelectionCount 1 Then MsgBox select one Curve Exit Sub End If Dim pEnumFeat As IEnumFeature Dim pFeature As IFeature Set pEnumFeat = pEditor.EditSelection Dim pCurve As ICurve Dim pPointFrom As IPoint Dim pPointTo As IPoint Set pPointFrom = New Point Set pPointTo = New Point Set pFeature = pEnu
24、mFeat.Next While Not pFeature Is Nothing If pFeature.Shape.GeometryType = esriGeometryPolyline Or _ esriGeometryPolyline Or esriGeometryLine Then Set pCurve = pFeature.Shape pCurve.QueryFromPoint pPointFrom pCurve.QueryToPoint pPointTo MsgBox +ICurve properties. & vbCrLf _ & Curve.QueryFromPoint (x,
25、y) = & pPointFrom.X & , & pPointFrom.Y & vbCrLf _ & Curve.QueryToPoint (x,y) = & pPointTo.X & , & pPointTo.Y & vbCrLf End If Set pFeature = pEnumFeat.Next WendEnd Sub复制代码IPolyline接口的第四个方法Generalize (maxAllowableOffset ) (方法,用道格拉斯普克发来简化polyline)IPolyline接口的第五个方法Weed (maxAllowableOffsetFactor ) (方法,和方
26、法Generalize类似,均为简化polyline的方法,不同的是参数。)8. 关于IGeometry接口(esriGeometry) Public Sub t_IGeometry_polygon() Dim pID As New UID pID = esriEditor.editor Dim pEditor As IEditor Dim pApp As IApplication Set pApp = Application Set pEditor = pApp.FindExtensionByCLSID(pID) If pEditor.SelectionCount 1 Then MsgBox
27、 select one polygon Exit Sub End If Dim pEnumFeat As IEnumFeature Dim pFeature As IFeature Set pEnumFeat = pEditor.EditSelection Dim pGeometry As IGeometry Set pFeature = pEnumFeat.Next While Not pFeature Is Nothing If pFeature.Shape.GeometryType = esriGeometryPolygon Then(通过pFeature.Shape获得Geometry
28、) Set pGeometry = pFeature.Shape MsgBox +Polygon:IGeometry properties. & vbCrLf _ & Dimension = & pGeometry.Dimension & vbCrLf _ & Geometry type = & pGeometry.GeometryType & vbCrLf _ & Envelope = & pGeometry.Envelope.XMin & , & pGeometry.Envelope.YMin & , _ & pGeometry.Envelope.XMax & , & pGeometry.Envelope.YMin & vbCrLf _ & IsEmpty = & pGeometry.IsEmpty & vbCrLf _ & SpatialReference = & pGeometry.SpatialReference.Name End If Set pFeature = pEnumFeat.Next WendEnd Sub复制代码IGeometry接口的第一个属性Dimension(只读,返回一个类型为esriGeometryDime
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