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1.
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:
IFeatureClass pFC_SCP_PT;
editPT = new FieldClass();
editPT.Precision_2 = 8;
editPT.Scale_2 = 3;
editPT.Name_2 = "ELEV1";
editPT.Type_2 = esriFieldType.esriFieldTypeDouble;
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 IFields
Dim pField As IField
Dim pGeoDef As IGeometryDef
Dim pDomain As IDomain
Dim i As Long
Set pFields = pFeatClass.Fields
For i = 0 To pFields.FieldCount- 1
Next
2.
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.AddField((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:
IFeatureClass pFC_SCP_PT;
editPT = new FieldClass();
editPT.Precision_2 = 8;
editPT.Scale_2 = 3;
editPT.Name_2 = "ELEV1";
editPT.Type_2 = esriFieldType.esriFieldTypeDouble;
3.
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 Long
Dim pField As IField
For i = 0 To (pFields.FieldCount- 1)
Next i
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 AsInteger
Dim pFields AsIFields
Dim pField AsIField
'Get Fields
Set pFields = pFeatClass.Fields
'Find the fieldnamed"average_income"
i =pFields.FindField("average_income")
'Set the currentfield
Set pField = pFields.Field(i)
'Delete field fromfeatureclass
pFeatClass.DeleteFieldpField
IFields接口的第四个方法FindFieldByAliasName(Name)(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 AsInteger
Dim pFields AsIFields
Dim pField AsIField
'Get Fields
Set pFields = pFeatClass.Fields
'Find the fieldwiththealiasname"currentpopulation"
i =pFields.FindFieldByAliasName("currentpopulation")
'Set the currentfield
Set pField = pFields.Field(i)
'Delete field fromfeatureclass
pFeatClass.DeleteFieldpField
4.
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 AsIPoint
Set pPoint = NewPoint
pPoint.PutCoords100,100
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 asIPoint
Dim dX asDouble,dYasDouble
pPoint.QueryCoordsdX,dY
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 closespointtolinefrom(0,0)withangles
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 t_constraindistance()
5.
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)
IPointArray接口的第五个方法Remove (Index )
IPointArray接口的第六个方法RemoveAll (方法,移除所有在此数组中的点)
6.
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.
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QueryFromPoint (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()
End Sub
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
8.
Public Sub t_IGeometry_polygon()
(通过pFeature.Shape获得Geometry)
IGeometry接口的第一个属性Dimension(只读,返回一个类型为esriGeometryDimension的该图形的几何维度)
-1
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IGeometry接口的第二个属性Extent(只读,返回一个类型为IEnvelope的该图形的几何范围的最大边框)
IGeometry接口的第三个属性GeometryType(只读,返回一个类型为esriGeometryType的该图形的几何类型)
esriGeometryNull
esriGeometryPoint
esriGeometryMultipoint
esriGeometryPolyline
esriGeometryPolygon
esriGeometryEnvelope
esriGeometryPath
esriGeometryAny
esriGeometryMultiPatch
esriGeometryRing
esriGeometryLine
esriGeometryCircularArc
esriGeometryBezier3Curve
esriGeometryEllipticArc
esriGeometryBag
esriGeometryTriangleStri
esriGeometryTriangleFan
esriGeometryRay
esriGeometrySphere
9.
Public Sub t_IArea_polygon()
End Sub
IArea接口的第一个属性Area(只读,返回一个double类型的数值,为此Area的面积)
IArea接口的第二个属性Centroid(只读,返回一个IPoint类型的变量,为此Area的重心)
IArea接口的第三个属性LablePoint(只读,返回一个IPoint类型的变量,为此Area的标签的位置,一般都在此Area的内部)
IArea接口的第四个方法QueryCentroid (Center ) (方法,Center参数为一个IPoint类型的变量,通过调用此方法将重心点赋值给参数Center)
IArea接口的第五个方法QueryLablePoint (LablePoint ) (方法,LablePoint参数为设置IPoint类型的变量,通过调用此方法将标签点赋值给参数LablePoint)
10.
应用:(中心放大)
Public Sub ZoomInCenter()
End Sub
IEnvelope接口的第一个方法CenterAt(pPoint) (方法,将这个矩形的边框移动到参数pPoint的位置,但是其他属性不变,如它的Width和Height)
例子代码:
' The example showshowtomoveanEnvelopetoanew
'centerpoint(pPoint).
Public Sub t_EnvCenterAt()
End Sub
IEnvelope接口的长宽属性Height和Width属性(读写,可以通过该属性获取或设置该边框的长和宽)
IEnvelope接口的4个顶点属性UpperLeft、UpperRight、LowerLeft和LowerRight(读写,返回IPoint类型的四个顶点,比直接获得最值坐标更加方便严谨)
例子代码:
Private Sub Form_Load()
IEnvelope接口的最值坐标属性XMax、XMin、YMax和YMin(读写,可以通过该属性获取或设置该边框的四个顶点的坐标)
IEnvelope接口的第五个方法Union (inEnvelope ) (方法,将参数输入的几何边框和调用该方法的几何边框求并集,并将结果赋值给第一个边框,即调用此方法的object)
例子代码:
Public Sub t_EnvUnion()
End Sub
IEnvelope接口的第六个方法Union (inEnvelope ) (方法,返回与输入参数相交的区域的几何边框,并将结果赋值给第一个边框,即调用此方法的object)
例子代码:
' The example showshowtointersect2envelopes.Theresultisputin
'thefirstenvelope.
End Sub
IEnvelope接口的第七个方法PutCoords (XMin, YMin,XMax,YMax) (方法,将新建的一个边框的4个极坐标设置为输入的参数)
例子代码:
Public Function CreateEnvXY(dblXMinAsDouble,dblYMinAsDouble,_
End Function
IEnvelope接口的第八个方法QueryCoords (XMin, YMin,XMax,YMax)(方法,将已有的一个边框的4个极坐标输出到参数当中以备后用)
IEnvelope接口的第九个方法Expand (dx, dy, asRatio) (方法,按照输入的dx与dy参数来放大或者缩小当前的边框,用与对ArcMap窗体的中心放大或缩小,或者点击屏幕获得点击点的坐标,并将中心点设置成点击点,并进行一定比例的放大或者缩小)
例子代码:
Public Sub t_EnvExpand()
End Sub
注意!!!一般情况设置为True,来控制倍数的放大
Expand scales thesizeoftheEnvelope.
XMin = XMin - dx
YMin = YMin - dy
XMax = XMax +dx
YMax = YMax +dy
If asRatio = TRUE,theexpansionismultiplicative.
XMin = (XMin - dx*Width)/2
YMin = (YMin - dy*Height)/2
XMax = (XMax +dx*Width)/2
YMax = (YMax +dy*Height)/2
The Envelope remainscenteredatthesameposition.
IEnvelope接口的第十个方法Offset (X, Y)(方法,将已有的一个边框的按照输入参数的大小来进行水平竖直的移动)
例子代码:
Private Sub btnOffset_Click()
End Sub
注意!!!
The new positionoftheEnvelopeisasfollows:
newXMin = old XMin+X
newYMin =oldYMin+Y
newXMax =oldXMax+X
newYMax =oldYMax+Y
11.
IFeature接口的第一个属性Class(只读)
IFeature接口的第二个方法Delete(方法,删除该行。因为一个Feature在表格中对应的就是一行数据,删除该行就能相应的删除这个Feature)
IFeature接口的第三个属性Extent(只读,获取该Feature要素在地图上的一个矩形范围,返回值为IEnvelope类型)
IFeature接口的第四个属性FeatureType(只读,获取该Feature要素的要素类型,返回值为枚举类型的esriFeatureType)
IFeature接口的第五个属性Fields(只读,获取该Feature要素的字段集合,返回值为IFields类型)
IFeature接口的第六个属性Shape(读写,获取该Feature要素的图形,返回值为IGeometry类型,或者各种实体化的类型,如IPolyline)
IFeature接口的第七个属性ShapeCopy(只读,克隆该Feature要素的几何图形,返回值为IGeometry类型)
IFeature 接口的第八个方法Store(方法,保存该行。)
此属性可用于对Feature要素的几何图形进行操作,步骤如下:
用IFeature.ShapeCopy方法获取一个已经存在的Geometry,或者新建一个Geometry
对Geometry进行操作
通过IFeature.Shape属性将Geometry写入
通过IFeature.Store方法保存该Feature要素
例子代码:
Dim pFeature AsIFeature
Dim pGeo AsIGeometry
Set pGeo = pFeature.ShapeCopy
'Change the shape
pFeature.Shape =pGeo
pFeature.Store
IFeature接口的第九个属性Value(读写,利用字段的索引进行对该要素该字段的值的读写)
注意,索引Index是从0开始的。
object.Value(Index ) = [ value ]
IFeature 接口的第十个属性Table(只读,将该行要素转换成ITable格式的数据,即可对一张表进行数据操作,具体方法查看ITable接口)
例子代码:
Dim pTable AsITable
Set pTable = pRow.Table
12.
IRow接口的第一个方法Delete(方法,删除该行)
IRow接口的第二个属性Fields(只读,获取该Feature要素的字段集合,返回值为IFields类型)此方法类似于IFeature接口的Fields属性
IRow 接口的第三个方法Store(方法,保存该行。)此方法类似于IFeature接口的Store方法
IRow接口的第四个属性Table(只读,获取该行所在的表格,返回值为ITable类型)
例子代码:
Dim pTable AsITable
Set pTable = pRow.Table
IRow接口的第五个属性Value(Index) (读写,获取该行在参数索引的字段的值,注意,索引Index是从0开始的。)
object.Value(Index ) = [ value ]
IRow接口的第六个属性HasOID(只读,判断指出该行是否有OID)
IRow接口的第七个属性OID(只读,获取该行的OID值)
例子代码:
If pRow.HasOID Then
End If
13.
Dim pFeatcls AsIFeatureClass
Dim pFeatLayer AsIFeatureLayer
Dim pDoc AsIMxDocument
Dim pMap AsIMap
Set pDoc = ThisDocument
Set pMap = pDoc.Maps.Item(0)
Set pFeatLayer = pMap.Layer(0)
Set pFeatcls = pFeatLayer.FeatureClass
IFeatureClass接口的第一个方法AddField(Field) (方法,增加一个属性字段到这个要素类,其中传入的参数为一个IField接口的变量,此变量可以由其他要素类获得并赋值给要操作的要素类,可用IFeilds接口的Field属性来获得)
IFeatureClass接口的第二个方法DeleteField(Field) (方法,删除一个属性字段,其中传入的参数为一个IField接口的变量)
IFeatureClass接口的第三个属性Fields(只读,获取该要素类的全部属性字段,返回一个IFields类型的变量)
例子代码:
'Assume we haveareferencetoafeatureclass,pFC
Dim pFields AsIFields
Dim pField AsIField
Set pFields = pFC.Fields
Set pField = pFields.Field(pFields.FindField("MyField"))
pFC.DeleteFieldpField
IFeatureClass接口的第四个方法FindField(Name)(方法,去查找在该要素类里面是否含有参数名字的属性字段,如果有,则返回索引,没有,则返回-1)
IFeatureClass接口的第五个属性AreaField(只读,获取属性字段为geometry的那一个Field)
例子代码:
Dim pFeatcls AsIfeatureClass
Dim pFeatLayer AsIFeatureLayer
Dim pDoc AsIMxDocument
Dim pMap AsImap
Set pDoc = ThisDocument
Set pMap = pDoc.Maps.Item(0)
Set pFeatLayer = pMap.Layer(0)
Set pFeatcls = pFeatLayer.FeatureClass
Dim pFld AsIField
Set pFld = pFeatcls.AreaField
If Not pFldIsNothingThen
MsgBox pFld.Name
End If
IFeatureClass接口的第六个方法Search (filter, Recycling) (方法,去得到一个IFeatureCursor类型的游标,该游标由filter来控制赛选,如果filter等于null,则返回整个featureclass的游标,再用IfeatureCursor的NextFeature的方法依次得到每一个Feature)
例子代码:
Dim pFeatcls AsIFeatureClass
Dim pFeatLayer AsIFeatureLayer
Dim pDoc AsIMxDocument
Dim pMap AsIMap
Set pDoc = ThisDocument
Set pMap = pDoc.Maps.Item(0)
Set pFeatLayer = pMap.Layer(0)
Set pFeatcls = pFeatLayer.FeatureClass
'+++createthequeryfilter,andgive
'+++itawhereclause
Dim pQFilt AsIQueryFilter
Dim pFeatCur AsIFeatureCursor
Set pQFilt = NewQueryFilter
pQFilt.WhereClause= "subtype = 'COM'"
Set pFeatCur = pFeatcls.Search(pQFilt,False)
'+++gettheareafield
Dim pFlds AsIFields
Dim pFld AsIField
Dim lAIndex AsLong
Set pFlds = pFeatcls.Fields
lAIndex =pFlds.FindField("Area")
Set pFld = pFlds.Field(lAIndex)
'+++avariabletoholdthetotalarea
Dim dtotArea AsDouble
dtotArea =0#
'+++loopthroughallofthefeaturesand
'+++calculatethesumofalloftheareas
Dim pFeat AsIFeature
Set pFeat = pFeatCur.NextFeature
Do
dtotArea =dtotArea+pFeat.Value(lAIndex)
Set pFeat = pFeatCur.NextFeature
Loop Until pFeatIsNothing
'+++sendthetotalareatoamessagebox
MsgBox dtotArea
IFeatureClass接口的第七个方法Insert(useBuffering) (方法, 去得到一个IFeatureCursor类型的游标,来用作插入新的Features,useBuffering是一个布尔型参数,当为True时即可以 插入新的Feature,再用IFeatureCursor的InsertFeature (buffer)的方法去插入一个新的Feature)
例子代码:
Dim pFeatcls AsIFeatureClass
Dim pFeatLayer AsIFeatureLayer
Dim pDoc AsIMxDocument
Dim pMap AsImap
Set pDoc = ThisDocument
Set pMap = pDoc.Maps.Item(0)
Set pFeatLayer = pMap.Layer(0)
Set pFeatcls = pFeatLayer.FeatureClass
Dim pFeatCur AsIFeatureCursor
Dim pFeatBuf AsIFeatureBuffer
Dim v AsVariant
Set pFeatCur = pFeatcls.Insert(True)
Set pFeatBuf = pFeatcls.CreateFeatureBuffer
v =pFeatCur.InsertFeature(pFeatBuf)
IFeatureClass接口的第八个方法CreateFeatureBuffer(方法,新建一个缓冲,返回一个IFeatureBuffer类型的变量,然后再对这个变量进行操作)
例子代码:
Dim pFeatcls AsIFeatureClass
Dim pFeatLayer AsIFeatureLayer
Dim pDoc AsIMxDocument
Dim pMap AsIMap
Set pDoc = ThisDocument
Set pMap = pDoc.Maps.Item(0)
Set pFeatLayer = pMap.Layer(0)
Set pFeatcls = pFeatLayer.FeatureClass
'createafeaturecursorandfeaturebufferinterface
Dim pFeatCur AsIFeatureCursor
Dim pFeatBuf AsIFeatureBuffer
'openthefeaturecursorandfeaturebuffer
Set pFeatCur = pFeatcls.Insert(True)
Set pFeatBuf = pFeatcls.CreateFeatureBuffer
'getthelistoffields
Dim pFlds AsIFields
Dim pFld AsIField
Dim i AsLong
Dim pPolygon AsIPolygon
Dim pPolyline AsIPolyline
Dim pPt AsIPoint
Set pPolygon = NewPolygon
Set pPolyline = NewPolyline
Set pPt = NewPoint
'findthegeometryfield,basedontheshapetype,
'setthevalueforthefieldtotheappropriateobject
Set pFlds = pFeatcls.Fields
For i = 1TopFlds.FieldCount- 1
Set pFld = pFlds.Field(i)
If (pFld.Type = esriFieldTypeGeometry)Then
Dim pGeom AsIGeometry
Next i
'insertthefeaturefromthebufferintothedatabase
pFeatCur.InsertFeaturepFeatBuf
14.
ITable是把要素类当成一个表格来看,每一列对应一个字段(Field),每一行对应一个要素(Feature),所以对要素类(IFeatureClass)接口的操作均可以类似的在Itable接口中找到。
两个接口可以进行如下强制转化:
VB语言
Dim pFC AsIFeatureClass
Dim pTable AsITable
Set pTable = pFC
C#语言
IFeatureClass pFC;
ITable pTable;
pTable =(ITable)pFC;
ITable接口的第一个方法AddField(Field)(方法,增加一个属性字段到这个表,其中传入的参数为一个IField接口的变量,此变量可以由其他表获得并赋值给要操作的表,可用IFeilds接口的Field属性来获得)
ITable接口的第二个方法GetRow(OID) (方法,通过OID来从表格数据库中获取一行,返回一个IRow接口的变量)此方法类似于IFeatureClass接口的GetFeature方法
例子代码:
Dim pWorkspace AsIWorkspace
Dim pFact AsIWorkspaceFactory
' This example usesanSDEconnection.Thiscodeworksthe
'sameforanyopenIWorkspace.
Dim pPropset AsIPropertySet
Set pPropset = NewPropertySet
With pPropset
End With
Set pFact = NewSdeWorkspaceFactory
Set pWorkspace = pFact.Open(pPropset,Me.hWnd)
Dim pFeatureWorkspaceAsIFeatureWorkspace
Set pFeatureWorkspace =pWorkspace
Dim pTable AsITable
Set pTable = pFeatureWorkspace.OpenTable("Pavement")
Dim pRow AsIRow
Set pRow = pTable.GetRow(59)
Debug.Print pRow.Value(2)
ITable接口的第三个方法GetRows(oids, Recycling) (方法,得到一个游标ICursor,通过一个oids的OID数组参数和一个Recycling的布尔类型的参数,一般为True)此方法类似于IFeatureClass接口的GetFeatures方法
例子代码:
Dim iOIDList() AsLong
Dim iOIDListCount AsLong
iOIDListCount =5
ReDim iOIDList(iOIDListCount)
iOIDList(0) =1
iOIDList(1) =2
iOIDList(2) =3
iOIDList(3) =4
iOIDList(4) =50
Dim pCursor AsICursor
Set pCursor = pTable.GetRows(iOIDList,True)
Dim pRow AsIRow
Set pRow = pCursor.NextRow
While Not pRowIsNothing
Wend
ITable接口的第四个方法RowCount(QueryFilter) (方法,得到满足查询过滤器条件的行数。此方法IFeatureClass接口没有,所以是一个很好的有条件查询要素数量的一个方法)
15.
Dim pFeatureSelectionAsIFeatureSelection
Set pFeatureSelection =pFeatureLayer
Dim pSelectionSet AsISelectionSet
Set pSelectionSet = pFeatureSelection.SelectionSet
Dim pFeatureCursor AsIFeatureCursor
pSelectionSet.SearchNothing,True,pFeatureCursor
Dim pDataStats AsIDataStatistics
Set pDataStats = NewDataStatistics
Set pDataStats.Cursor =pFeatureCursor
pDataStats.Field ="POP1990"
MsgBox pDataStats.Statistics.Mean
IFeatureCursor接口的第一个方法NextFeature(方法,将游标向前跳到下一个位置,并且返回该位置的Feature)
IFeatureCursor接口的第二个方法UpdateFeature(Feature) (方法,对当前游标位置的Feature进行更新)
例子代码:
'Assume we alreadyhaveareferencetoafeatureclasswiththem_pFClassvariable
IFeatureCursor接口的第三个方法InsertFeature(buffer) (方法,用参数传进来的属性值插入一个新的要素到数据库中,返回该插入新的Feature的ID值,其中参数类型为IFeatureBuffer)
例子代码:
Public Sub FeatureBufferCode()
End Sub
16.
Dim pQueryFilter AsIQueryFilter
Set pQueryFilter = NewQueryFilter
pQueryFilter.SubFields=
pQueryFilter.WhereClause= "STATE_NAME = 'California'"
Dim pFeatureCursor AsIFeatureCursor
Set pFeatureCursor = pFeatureClass.Search(pQueryFilter,False)
IQueryFilter接口的第一个属性WhereClause(读写,为过滤器设置条件语句)
注意!各种不同的数据,设置条件查询语句的语法是不相同的,如一个shp文件在设置字段的时候要加“””双引号,而在SDE数据连接中,则什么都不加;在gdb文件的语句中,符号是“*”,而在SDE或者shp文件查询中则是“%”
IQueryFilter接口的第二个属性SubFields(读写,为过滤器设置提供赛选的字段,用逗号来分隔每一个逗号,如果不设置该属性,则当做所有字段均为查找字段)
17.
Sub AddLayer()
'createsaFeatureLayerfromashapefileandaddstothemapinArcMap
End Sub
IFeatureLayer接口的第一个属性FeatureClass(读写,设置或者读取此layer的要素类)
IFeatureLayer接口的第二个属性MaximumScale(读写,设置或者读取此layer显示的最大比例尺)
IFeatureLayer接口的第三个属性MinimumScale(读写,设置或者读取此layer显示的最小比例尺)
IFeatureLayer接口的第四个方法Search (queryFilter, recycling ) (方法,创建一个游标去查询相应设置的过滤器的查询)
IFeatureLayer接口的第五个属性Visible(读写,设置或者读取此layer的可见性)
IFeatureLayer接口的第六个属性AreaOfInterest(只读,读取此layer的最大范围,回返一个IEnvelope接口的变量)
18.
IFeatureSelection接口的第一个方法SelectFeatures (Filter, Method, justOne ) (方法,根据指定的标准过滤器filter和方法,选择要素,第一个参数为QueryFilter类型的变量,第二个参数为esriSelectionResultEnum类型的变量,第三个参数为布尔型变量,通常为false)
19.
IMap接口的第一个属性Layers (uid, recursive ) (只读,第二个参数为True的时候,该属性获取第一个参数uid指定的Layers,赋值给一个IEnumLayer的变量)
例子代码:
Sub GetFeatureLayers()
End Sub
其中比较常用的UID参数值如下:
{6CA416B1-E160-11D2-9F4E-00C04F6BC78E} IDataLayer
{40A9E885-5533-11d0-98BE-00805F7CED21} IFeatureLayer
{E156D7E5-22AF-11D3-9F99-00C04F6BC78E} IGeoFeatureLayer
{34B2EF81-F4AC-11D1-A245-080009B6F22B} IGraphicsLayer
{5CEAE408-4C0A-437F-9DB3-054D83919850} IFDOGraphicsLayer
{0C22A4C7-DAFD-11D2-9F46-00C04F6BC78E} ICoverageAnnotationLayer
{EDAD6644-1810-11D1-86AE-0000F8751720} IGroupLayer
IMap接口的第二个属性LayerCount(只读,返回该map里面Layer的个数)
IMap接口的第三个属性Layer(Index) (只读,返回指定索引index位置的Layer)
IMap接口的第四个方法AddLayer(Layer) (方法,向该map添加一个Layer)
例子代码:
Public Sub AddShapeFile()
End Sub
IMap接口的第五个方法AddLayers(Layers, autoArrange) (方法,添加一个EnumLayer变量的layers到该map,第一个参数为IEnumLayer类型,第二个参数为bool型变量)
IMap接口的第六个方法ClearLayers(方法,将所有的layer从map中移除)
IMap接口的第七个方法ClearSelection(方法,将该map中选择的要素清空)
IMap接口的第八个属性SelectionCount(只读,返回该map被选中要素的个数)
IMap接口的第九个方法SelectFeature(Layer,Feature) (方法,从一个Layer中选择一个Feature)
IMap接口的第十个属性MapScale(读写,获取或者设置当前map的地图比例尺,double类型)
IMap接口的第十一个方法MoveLayer(Layer,toIndex) (方法,把一个Layer从当前的位置移动到指定的索引位置)
例子代码:
Public Sub MoveLayer()
End Sub
IMap接口的第十二个方法SelectByShape(Shape, env, justOne) (方法,从Layer中依靠一个图形的范围shape和一个选择的环境env来选择要素,而在所有图层中只从IFeatureLayer的图层中进行选择)
20.
IPropertySet接口的第一个方法SetProperties (names, values ) (方法,设置属性)
IPropertySet接口的第二个方法SetProperty (name, value ) (方法,设置属性)
例子代码:
Dim pPropset AsIPropertySet
Set pPropset = NewPropertySet
With pPropset
.SetProperty"Server",m_SDEServerName
.SetProperty"Instance",m_SDEServerInst
.SetProperty"user",m_SDEServerUserName
.SetProperty"password",m_SDEServerPass
.SetProperty"Database",m_SDEDatabaseName
.SetProperty"version",m_SDEVersionName
End With
Dim pFactSDE AsIWorkspaceFactory
Set pFactSDE = NewSdeWorkspaceFactory
Dim pWorkSpaceSDE AsIWorkspace
Set pWorkSpaceSDE = pFactSDE.Open(pPropset,Me.hWnd)
'Example of howtouseapropertysettoopenaPersonalGeodatabaseworkspace.
Dim pPropset AsIPropertySet
Set pPropset = NewPropertySet
pPropset.SetProperty"DATABASE", "d:\\data\\Access Data\\First.mdb"
Dim pFactAccess AsIWorkspaceFactory
Set pFactAccess = NewAccessWorkspaceFactory
Dim pWorkSpaceAccess AsIWorkspace
Set pWorkSpaceAccess =pFactAccess.Open(pPropset,Me.hWnd)
21.
IFeatureWorkspace接口的第一个方法OpenFeatureClass (Name) (方法,从一个要素工作空间打开一个要素,返回一个IFeatureClass类型的变量)
例子代码:
'This example opensashapefileasafeatureclass.
Public Sub OpenFeatureClass_Example()
End Sub
22.
例子代码:
Public Sub WorkspaceEdit()
End Sub
在实际问题中,如果有多次操作需要更改Feature的时候,切记要将操作对象重新赋值,不然在pWorkspaceEdit.StopEditing(true)的时候会出现错误,报错代码为-2147467259。
(详细代码可见WindowsApplication6的代码,其中详细操作了对字段的编辑过程,其中涉及到很多对字段Field的方法 Add(Field),Delete(Field),get_value(object value),set_value(intindex, object value)等等操作,其中还涉及到Feature经过ICursor类选取与经过FeatureClass类的方法GetFeature选取的区别)
23.
IWorkspaceFactory接口的第一个方法Open (ConnectionProperties, hWnd ) (方法,从一个工作工厂打开一个工作空间,并返回IWorkspace类型的变量,方法中的第一个参数ConnectionProperties是IPropertySet接口的变量)
例子代码:
Dim pSdeWorkspaceFactoryAsIWorkspaceFactory
Dim pSdeWorkspace AsIWorkspace
Dim pConnectionPropertiesAsIPropertySet
Set pConnectionProperties =NewPropertySet
With pConnectionProperties
End With
Set pSdeWorkspaceFactory =NewSdeWorkspaceFactory
Set pSdeWorkspace = pSdeWorkspaceFactory.Open(pConnectionProperties,0)
IWorkspaceFactory接口的第二个方法OpenFromFile (fileName, hWnd ) (方法,从一个路径打开一个工作空间,并返回IWorkspace类型的变量)
例子代码:
Dim pSdeWorkspaceFactoryAsIWorkspaceFactory
Dim pSdeWorkspace AsIWorkspace
Set pSdeWorkspaceFactory =NewSdeWorkspaceFactory
Set pSdeWorkspace = pSdeWorkspaceFactory.OpenFromFile("D:\data\redarrow.sde",0)
24.
例子代码:
Share a linesegment
ThissampleusesITopologicalOperator::Intersecttodotheequivalentofaselectbylocationwiththesharealinesegmentoperator.
Public Sub ShareLineSegment()
'isthereanintersectionbwthetwofeatures
'pGeomnowcontainstheintersectionofpf1andpf2
'becausedimension =esriGeometry1Dimension
'itisageometryoftypepolyline
'iftheintersectionofthetwofeaturesconsistedofapointorpointspgeomwouldbeempty
'wecoulduseITopologicalOperator::Intersectwith0dimensiontofindaboutthosepoints
'ifpGeomcontainsonlytwoverticesthentheintersectionisasimplelinesegment
'3verticesmeansit'sapolylinewithtwosuccessivesegments
'>3 means we haveseveral segments or a polyline or a combination of these
End Sub
可以将一个Polygon类型的数据或者Polyline的数据赋值给该接口的变量,如:
Set pUnionedPolylines =NewPolyline
Set pTopOp = pUnionedPolylines
ITopologicalOperator接口的第一个方法ConstructUnion(geometries ) (方法,合并图形的工具,输入的参数是一个IEnumGeometry类型的参数,此方法效率甚高)
ITopologicalOperator接口的第二个方法Cut(cutter, leftGeom, rightGeom) (方法,剪切图形,第一个参数为剪切的线要素,为IPloyline类型,第二个第三个参数均为剪切后的图形,为输出参数)
ITopologicalOperator接口的第三个方法Boundary(方法,获取一个图形的边框,一个Polygon的boundary是一个Polyline类型的要素,一个Polyline的boundary是一个nultipoint类型的要素,一个Point的boundary是为空的)
ITopologicalOperator接口的第四个方法Buffer(distance) (方法,创造一个Polygon的要素来显示缓冲区域,参数为缓冲距离)
例子代码:
'This example demonstrateshowtouseITopologicalOperator::Buffer
Sub exampleITopologicalOpera
Dim ptc AsIPointCollection,iAsLong,paAsIArea,ptopoAsITopologicalOperator
Dim pt(4) AsIPoint,poutPolyAsIPolygon
Set ptc = NewPolygon
'The spatial referenceshouldbesethereusingIGeometry::SpatialReference(Codeskippedhere)
For i = 0To4
Next
pt(0).PutCoords0,0
pt(1).PutCoords0,10
pt(2).PutCoords10,10
pt(3).PutCoords10,0
pt(4).PutCoords0,0
ptc.AddPoints5,pt(0)
Set pa = ptc
Debug.Print "Area originalpolygon: " & pa.Area
Set ptopo = ptc
Set poutPoly = ptopo.Buffer(1)'Outsidebuffer
Set pa = poutPoly
Debug.Print "Area polygonpositivedistance: " & pa.Area
Set poutPoly = ptopo.Buffer(-1)'Insidebuffer
Set pa = poutPoly
Debug.Print "Area polygonnegativedistance: " & pa.Area
End Sub
ITopologicalOperator接口的第五个方法Clip (clipperEnvelope ) (方法,输入一个IEnvelope类型的变量,来获取被这个边框剪切的要素,并将切割后的变量返回给调用方法的变量)
ITopologicalOperator接口的第六个方法QueryClipped (clipperEnvelope, clippedGeometry ) (方法,与Clip类似,但是第二个参数为剪切后返回输出的参数,本身不会改变)
ITopologicalOperator接口的第七个方法ConvexHull(方法,构造一个Geometry,大部分为Polygon类型的几何要素,该要素为调用此方法的ITopologicalOperator类型的变量最小的外边框)
ITopologicalOperator接口的第八个方法SymmetricDifference (other ) (方法,并集减去交集的部分,调用次方法的变量为第一个参数,other为第二个参数,最后返回变量到一个Geometry类型的变量,该变量的范围均在两个参数范围内,但不在两个参数相交的部分)
25.
===============================
怎样创建buffer:(来源于管网线处理删除冗余节点)
===============================
Dim pTopOper As ITopologicalOperator
Set pTopOper = pfeature.Shape
Dim pGeometry As IGeometry
Set pGeometry = pTopOper.Buffer(1)
(注意,这个pfeature是在前面定义的pfeature=pFeatureCursor.NextFeature,不用重新定义一个)
===============================
怎样在buffer里面选择要素:
===============================
Dim pSpFilter AsISpatialFilter
Set pSpFilter = NewSpatialFilter
Dim pTopOper AsITopologicalOperator
Set pTopOper = pfeature.Shape
Dim pGeometry AsIGeometry
Set pGeometry = pTopOper.Buffer(1)
Set pSpFilter.Geometry =pGeometry
pSpFilter.SpatialRel= esriSpatialRelContains
'(esriSpatialRelContains是ISpatialFilter里面SpatialRel的一种参数esriSpatialRelEnum,值为8,代表在这个区域内包含的要素)
Set m_pSelGW_D = pLyr_D
m_pSelGW_D.SelectFeaturespSpFilter, esriSelectionResultNew, False
'(m_pSelGW_D是IfeatureSelection类型的变量)
pSpFilter.SpatialRel= esriSpatialRelIntersects
Set m_pSelGW_X = pLyr
m_pSelGW_X.SelectFeaturespSpFilter,esriSelectionResultNew,False
26.
Vb语言:
Private Sub UnionSelected()
Dim pMxDoc AsIMxDocument
Dim pFtrLyr AsIFeatureLayer
Dim pFtrCls AsIFeatureClass
Dim pFtrSel AsIFeatureSelection
Dim pFtr AsIFeature
Dim pEnumGeom AsIEnumGeometry
Dim pEnumGeomBind AsIEnumGeometryBind
Dim pTopOp AsITopologicalOperator
Dim pUnionedPolylinesAsIPolyline
End Sub
C#语言:
if(pFC.ShapeType== ESRI.ArcGIS.Geometry.esriGeometryType.esriGeometryPolygon)
{
}
returnpGeom;
===============================
怎样从Table中获取具体需求值的Row:
===============================
ITable pTable = (ITable)pFC;
===============================
怎样ZoomInCenter:
===============================
Public Sub ZoomInCenter()
End Sub
===============================
怎样读取一个字段内的所有值:
===============================
IFeatureClass pFC= m_SDEQuery.getFeatureClass();
IFeatureCursor pFeaCur= pFC.Search(null, false);
IFeature pFeature= pFeaCur.NextFeature();
===============================
怎样编辑更改属性字段的值:
===============================
IRow prow = (IRow)bendiFeatureC.GetFeature(1);
MessageBox.Show(prow.Table.Fields.FieldCount.ToString());
ITable ptable = (ITable)bendiFeatureC;
IQueryFilter pqfilter= new QueryFilterClass();
pqfilter.WhereClause = ""dkmc"= \'北江路南郊一公里\'";
IFeatureCursor pfeatcur;
pfeatcur = bendiFeatureC.Search(pqfilter, false);
IFeature pfff = pfeatcur.NextFeature();
while (pfff != null)
{
}
===============================
怎样将MapControl中的Map复制到PageLayoutControl中
===============================
Public Sub CopyAndOverwriteMap()
=ESRI.ArcGIS.Controls.esriControlsMousePointer
End Sub
===============================
怎样判断是否出于编辑状态:
===============================
If m_pEditor.EditState =esriStateEditingThen
End If
把m_pEditor.StartOperation放在函数里面更好
===============================
怎样用点创建一个Polygon:
===============================
Dim pPnt0 asIPoint,pPnt1asIPoint,pPnt2asIPoint
Set pPnt0 = NewPoint
Set pPnt1 = NewPoint
Set pPnt2 = NewPoint
pPnt0.PutCoordsx1,y1
pPnt1.PutCoordsx2,y2
pPnt2.PutCoordsx3,y3
Dim pPolygon as IPointCollection(注意,这里的polygon是设置为点集的)
Set pPolygon =New Polygon
pPolygon.AddPointpPnt0
pPolygon.AddPointpPnt1
pPolygon.AddPointpPnt2
pPolygon.AddPoint pPnt0(注意,这里一定要闭合回到pPnt0才能形成一个Polygon)
Set pFeature.Shape = pPolygon
pFeature.Store
用这种方法可以创建一个Polyline:
Dim pPolyline asIPointCollection
Set pPolyline =New Line
pPolyline.AddPointpPnt0
pPolyline.AddPointpPnt1
pPolyline.AddPointpPnt2(这时就是一个polyline,不是闭合的)
还可以用另外一种方法,画一条两点之间的线段:
Dim pLine AsILine
Set pLine = New esriGeometry.Line
pLine.PutCoords pPnt0,pPnt1(第一个为from点,第二个为to点)
)
===============================
怎样运用属性来计算总面积:
===============================
Dim pDoc As IMxDocument
Dim pMap As IMap
Dim pFeatureLayer As IFeatureLayer
Dim pFeatureClass As IFeatureClass
Set pDoc = m_pApplication.Document
Set pMap = pDoc.ActiveView.FocusMap
Set pFeatureLayer = pMap.Layer(0)
Set pFeatureClass = pFeatureLayer.FeatureClass
' +++ create the query filter, and give
' +++ it a where clause
Dim pQueryFilt As IQueryFilter
Dim pFeatureCursor As IFeatureCursor
Set pQueryFilt = New QueryFilter
pQueryFilt.WhereClause= "subtype = 'COM'"
Set pFeatureCursor =pFeatureClass.Search(pQueryFilt, False)
' +++ get the area field
Dim pFields As IFields
Dim pField As IField
Dim lAIndex As Long
Set pFields = pFeatureClass.Fields
lAIndex = pFields.FindField("Area")
Set pField = pFields.Field(lAIndex)
' +++ a variable to hold the total area
Dim dtotArea As Double
dtotArea = 0#
' +++ loop through all of the features and
' +++ calculate the sum of all of the areas
Dim pFeature As IFeature
Set pFeature = pFeatureCursor.NextFeature
Do
dtotArea = dtotArea + pFeature.Value(lAIndex)
Set pFeature = pFeatureCursor.NextFeature
Loop Until pFeature Is Nothing
' +++ send the total area to a message box
MsgBox dtotArea
===============================
关于属性域的一些心得
===============================
Dim pField As IField
Set pFieldsEdit.Field(1)= pField
个人觉得,在创建shp文件时,运用上面的方法就可以创建,但是当在GDB中创建featureclass的时候就会出现问题,有可能是空间参考的问题。所以个人觉得当在GDB中创建时,还是将已有的Ifields传进来比较保险
===============================
怎样实现翻折Flip方法:
===============================
Private Sub FlipFeature(pFeature As IFeature)
End Sub
好的,没问题,这是我随便写的,希望对你有用
===============================
回答机器猫FJJ关于ISpatialFilter接口方法的问题
===============================
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using ESRI.ArcGIS.Geodatabase;
using ESRI.ArcGIS.Carto;
namespace Solutions
{
}
===============================
回答网友韶华响当当关于更改符号的代码
===============================
private void axTOC1_OnDoubleClick(object sender, ITOCControlEvents_OnDoubleClickEvent e)
===============================
回答网友韶华响当当关于显示属性的代码
===============================
===============================
回答gjw1015关于IFeature变量添加进List数组里的问题
===============================
ListlistFeature = new List();
try
{
}
catch
{
}
for (int i = 0; i < pFC_TER_LN.FeatureCount([color=Red]null[/color]);i++)
{
}
转自 :GIS论坛
http://blog.sina.com.cn/s/blog_71d88f280100mj5j.html