两部分:
第一部分Shape 数据加载(同时打开多个文件)
第二部分 ao 中一些打开数据的代码--AO学习资料笔记
第一部分Shape 数据加载(同时打开多个文件)
/// <summary>
/// Shape 数据加载
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void mnuData_1_1_Click(object sender, System.EventArgs e)
{
OpenFileDialog dlg=new OpenFileDialog();
dlg.Filter="Shape file(*.shp)|*.shp";
dlg.Title="打开 Shape数据文档";
dlg.Multiselect=true;
//定义存放打开 IFeatureClass 的字符串数组
string[] FilePath;
if(dlg.ShowDialog()==DialogResult.OK)
{
FilePath=new string[dlg.FileNames.Length];
FilePath=dlg.FileNames;
if(FilePath.Length > 0)
{
string WorkSpacePath =System.IO.Path.GetDirectoryName(FilePath[0]);
string[] ShapeFilePath=new string[FilePath.Length] ;
//获得打开 IFeatureClass 的字符串数组
for(int i=0;i<FilePath.Length;i++)
{
ShapeFilePath[i]=System.IO.Path.GetFileName(FilePath[i]);
}
IWorkspaceFactory pWorkspaceFactory=new ShapefileWorkspaceFactoryClass();
IWorkspace pWorkspace=pWorkspaceFactory.OpenFromFile(WorkSpacePath,0);
IFeatureWorkspace pFeatureWorkspace=pWorkspace as IFeatureWorkspace;
for(int i=0;i<ShapeFilePath.Length;i++)
{
IFeatureClass pFeatureClass=pFeatureWorkspace.OpenFeatureClass(ShapeFilePath[i]);
IDataset pDataset=pFeatureClass as IDataset;
IFeatureLayer pFeatureLayer=new FeatureLayerClass();
pFeatureLayer.FeatureClass=pFeatureClass;
pFeatureLayer.Name=pDataset.Name;
ILayer pLayer=pFeatureLayer as ILayer;
this.axMapControl1.Map.AddLayer(pLayer);
}
}
}
}
第二部分 ao 中一些打开数据的代码--AO学习资料笔记
'----------------------------------------------------------------
'函数功能：从本地文件打开一个 FeatureClass
'----------------------------------------------------------------
Public Function OpenFC(sPath As String, sName As String) As IFeatureClass
Dim pWSF As IWorkspaceFactory
Dim pFCWS As IFeatureWorkspace
Dim pFC As IFeatureClass
Set pWSF = New ShapefileWorkspaceFactory
Set pFCWS = pWSF.OpenFromFile(sPath, 0)
Set pFC = pFCWS.OpenFeatureClass(sName)
Set OpenFC = pFC
Set pFC = Nothing
End Function
'-----------------------------------
'函数功能：删除制定字段
'-----------------------------------
Sub DeleteField(pFC As IFeatureClass, sFieldName As String)
Dim i As Integer
Dim pFields As IFields
Set pFields = pFC.Fields
Dim pField As iField
i = pFields.FindField(sFieldName)
If i >= 0 Then
Set pField = pFields.Field(i)
pFC.DeleteField pField
End If
End Sub
'--------------------------------------------------------
'函数功能：从本地文件打开一个 dbase 表
'--------------------------------------------------------
Public Function OpenTable(sFilePath As String, sTableName As String) As ITable
Dim pWorkspace As IWorkspace
Dim pFact As IWorkspaceFactory
Set pFact = New ShapefileWorkspaceFactory
Set pWorkspace = pFact.OpenFromFile(sFilePath, 0)
Dim pFWorkspace As IFeatureWorkspace
Set pFWorkspace = pWorkspace
Dim pTable As ITable
Set pTable = pFWorkspace.OpenTable(sTableName)
Set OpenTable = pTable
Set pTable = Nothing
End Function
'---------------------------------------------
'函数功能：打开本地的栅格影像
'---------------------------------------------
Public Function OpenRasterDataset(sDir As String, sFile As String) As
IRasterDataset
'Open the raster dataset with the given name.
'sDir is the directory the file resides
'sFile is the filename
Dim pWsFact As IWorkspaceFactory
Dim pWS As IRasterWorkspace
Dim pRasterDataset As IRasterDataset
'Open the workspace
Set pWsFact = New RasterWorkspaceFactory
Set pWS = pWsFact.OpenFromFile(sDir, 0)
'Open the raster dataset
Set pRasterDataset = pWS.OpenRasterDataset(sFile)
'Return
Set OpenRasterDataset = pRasterDataset
Set pWsFact = Nothing
Set pWS = Nothing
Set pRasterDataset = Nothing
End Function
'-------------------------
'创建一个 dbf 表
'-------------------------
Public Function createDBF(strName As String, strFolder As String, Optional
pFields As IFields) As ITable
' createDBF: simple function to create a DBASE file.
' note: the name of the DBASE file should not contain the .dbf extension
'
On Error GoTo EH
' Open the Workspace
Dim pFWS As IFeatureWorkspace
Dim pWorkspaceFactory As IWorkspaceFactory
Dim fs As Object
Dim pFieldsEdit As IFieldsEdit
Dim pFieldEdit As IFieldEdit
Dim pField As iField
Set pWorkspaceFactory = New ShapefileWorkspaceFactory
Set fs = CreateObject("Scripting.FileSystemObject")
If Not fs.FolderExists(strFolder) Then
MsgBox "Folder does not exist: " & vbCr & strFolder
Exit Function
End If
Set pFWS = pWorkspaceFactory.OpenFromFile(strFolder, 0)
' if a fields collection is not passed in then create one
If pFields Is Nothing Then
' create the fields used by our object
Set pFields = New Fields
Set pFieldsEdit = pFields
pFieldsEdit.FieldCount = 1
'Create text Field
Set pField = New Field
Set pFieldEdit = pField
With pFieldEdit
.length = 30
.Name = "TextField"
.Type = esriFieldTypeString
End With
Set pFieldsEdit.Field(0) = pField
End If
Set createDBF = pFWS.CreateTable(strName, pFields, Nothing, Nothing, "")
Exit Function
EH:
MsgBox Err.Description, vbInformation, "createDBF"
End Function
'----------------------------------------------------
'判断一个属性表中是否存在指定字段
'----------------------------------------------------
Public Function FieldIsExist(pFC As IFeatureClass, sFieldName As String) AsBoolean
FieldIsExist = False
Dim i As Integer
Dim pFields As IFields
Set pFields = pFC.Fields
Dim pField As iField
i = pFields.FindField(sFieldName)
If i >= 0 Then
FieldIsExist = True
End If
End Function
'---------------------------
' 得到文档的路径
'---------------------------
Public Function GetDocPath() As String
Dim pTemplates As ITemplates
Dim lTempCount As Long
Dim strNormalPath As String
Dim strBasePath As String
Dim strDocPath As String
Set pTemplates = Application.Templates
lTempCount = pTemplates.Count
' Normal is always the first item
strNormalPath = pTemplates.Item(0)
' The document is always the last item
strDocPath = pTemplates.Item(lTempCount - 1)
' If present, the base template is the middle item
If lTempCount = 3 Then
strBasePath = pTemplates.Item(1)
Else
strBasePath = "NO BASE TEMPLATE LOADED"
End If
strDocPath = StrReverse(strDocPath)
Dim inPos As Integer
inPos = InStr(strDocPath, "\")
strDocPath = VBA.Right(strDocPath, Len(strDocPath) - inPos)
GetDocPath = StrReverse(strDocPath)
End Function
'----------------------------
'打开一个 workspace
'----------------------------
Public Function OpenWS(sPathName As String) As IWorkspace
Dim pWSF As IWorkspaceFactory
Dim pWS As IWorkspace
Set pWSF = New ShapefileWorkspaceFactory
Set pWS = pWSF.OpenFromFile(sPathName, 0)
Set OpenWS = pWS
Set pWS = Nothing
End Function
'--------------------------------------------------
'将本地 shape 文件添加到图层中显示
'--------------------------------------------------
Public Sub AddShapeFile(sPath As String, sName As String)
Dim pWorkspaceFactory As IWorkspaceFactory
Dim pFeatureWorkspace As IFeatureWorkspace
Dim pFeatureLayer As IFeatureLayer
Dim pMxDocument As IMxDocument
Dim pMap As IMap
'Create a new ShapefileWorkspaceFactory object and open a shapefile folder
Set pWorkspaceFactory = New ShapefileWorkspaceFactory
Set pFeatureWorkspace = pWorkspaceFactory.OpenFromFile(sPath, 0)
'Create a new FeatureLayer and assign a shapefile to it
Set pFeatureLayer = New FeatureLayer
Set pFeatureLayer.FeatureClass =
pFeatureWorkspace.OpenFeatureClass(sName)
pFeatureLayer.Name = pFeatureLayer.FeatureClass.AliasName
'Add the FeatureLayer to the focus map
Set pMxDocument = Application.Document
Set pMap = pMxDocument.FocusMap
pMap.AddLayer pFeatureLayer
End Sub