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　　1
　　2' Copyright 1995-2005 ESRI
　　3
　　4' All rights reserved under the copyright laws of the United States.
　　5
　　6' You may freely redistribute and use this sample code, with or without modification.
　　7
　　 8' Disclaimer: THE SAMPLE CODE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
　　9' WARRANTIES, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
　　10' FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL ESRI OR
　　11' CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
　　12' OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
　　13' SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
　　14' INTERRUPTION) SUSTAINED BY YOU OR A THIRD PARTY, HOWEVER CAUSED AND ON ANY
　　15' THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT ARISING IN ANY
　　16' WAY OUT OF THE USE OF THIS SAMPLE CODE, EVEN IF ADVISED OF THE POSSIBILITY OF
　　17' SUCH DAMAGE.
　　18
　　19' For additional information contact: Environmental Systems Research Institute, Inc.
　　20
　　21' Attn: Contracts Dept.
　　22
　　23' 380 New York Street
　　24
　　25' Redlands, California, U.S.A. 92373
　　26
　　27' Email: contracts@esri.com
　　28
　　29Option Explicit
　　30
　　31' vb version of the PathFinder object
　　32
　　33' 本地变量
　　34Private m_ipGeometricNetwork As esriGeoDatabase.IGeometricNetwork
　　35Private m_ipMap As esriCarto.IMap
　　36Private m_ipPoints As esriGeometry.IPointCollection
　　37Private m_ipPointToEID As esriNetworkAnalysis.IPointToEID
　　38' 返回结果变量
　　39Private m_dblPathCost As Double
　　40Private m_ipEnumNetEID_Junctions As esriGeoDatabase.IEnumNetEID
　　41Private m_ipEnumNetEID_Edges As esriGeoDatabase.IEnumNetEID
　　42Private m_ipPolyline As esriGeometry.IPolyline
　　43
　　44
　　45' Optionally set the Map (e.g. the current map in ArcMap),
　　46' otherwise a default map will be made (for IPointToEID).
　　47
　　48Public Property Set Map(Map As esriCarto.IMap)
　　49　 Set m_ipMap = Map
　　50End Property
　　51
　　52Public Property Get Map() As esriCarto.IMap
　　53　 Set Map = m_ipMap
　　54End Property
　　55
　　56' Either OpenAccessNetwork or OpenFeatureDatasetNetwork
　　57' needs to be called.
　　58
　　59Public Sub OpenAccessNetwork(AccessFileName As String, FeatureDatasetName As String)
　　60
　　61　 Dim ipWorkspaceFactory As esriGeoDatabase.IWorkspaceFactory
　　62　 Dim ipWorkspace As esriGeoDatabase.IWorkspace
　　63　 Dim ipFeatureWorkspace As esriGeoDatabase.IFeatureWorkspace
　　64　 Dim ipFeatureDataset As esriGeoDatabase.IFeatureDataset
　　65
　　66　 ' After this Sub exits, we'll have an INetwork interface
　　67　 ' and an IMap interface initialized for the network we'll be using.
　　68
　　69　 ' close down the last one if opened
　　70　 CloseWorkspace
　　71
　　72　 ' open the mdb
　　73　 Set ipWorkspaceFactory = New esriDataSourcesGDB.AccessWorkspaceFactory
　　74　 Set ipWorkspace = ipWorkspaceFactory.OpenFromFile(AccessFileName, 0)
　　75
　　76　 ' get the FeatureWorkspace
　　77　 Set ipFeatureWorkspace = ipWorkspace
　　78
　　79　 ' open the FeatureDataset
　　80　 Set ipFeatureDataset = ipFeatureWorkspace.OpenFeatureDataset(FeatureDatasetName)
　　81
　　82　 ' initialize Network and Map (m_ipNetwork, m_ipMap)
　　83　 If Not InitializeNetworkAndMap(ipFeatureDataset) Then Err.Raise 0, "OpenAccessNetwork", "Error initializing Network and Map"
　　84
　　85End Sub
　　86
　　87Public Sub OpenFeatureDatasetNetwork(FeatureDataset As esriGeoDatabase.IFeatureDataset)
　　88　 ' close down the last one if opened
　　89　 CloseWorkspace
　　90　
　　91　 ' we assume that the caller has passed a valid FeatureDataset
　　92
　　93　 ' initialize Network and Map (m_ipNetwork, m_ipMap)
　　94　 If Not InitializeNetworkAndMap(FeatureDataset) Then Err.Raise 0, "OpenFeatureDatasetNetwork", "Error initializing Network and Map"
　　95
　　96End Sub
　　97
　　98' The collection of points to travel through must be set.
　　99
　　100Public Property Set StopPoints(Points As esriGeometry.IPointCollection)
　　101　 Set m_ipPoints = Points
　　102End Property
　　103

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