IGeometryFactory Interface

Provides access to members that create geometries from different inputs.

Members

	Name	Description
	CreateEmptyGeometryByESRIType	Create an empty geometry of the specified Esri shape file type.
	CreateEmptyGeometryByType	Creates an empty geometry of the specified ArcObjects geometry type.
	CreateGeometry	Create a point, polyline, polygon, or multipoint from the specified shapefile format buffer.
	CreateGeometryFromEnumerator	Creates a geometry bag containing references to geometries returned by the input geometry enumerator.
	CreateGeometryFromWkb	Create a point, polyline, polygon, or multipoint from the specified OGIS WKB format buffer.
	CreateGeometryFromWkbVariant	Create a point, polyline, polygon, or multipoint from the specified OGIS WKB format buffer.

IGeometryFactory.CreateEmptyGeometryByESRIType Method

Create an empty geometry of the specified Esri shape file type.

Public Sub CreateEmptyGeometryByESRIType ( _
    ByVal shapeType As esriShapeType, _
    ByRef outGeometry As IGeometry _
)

public void CreateEmptyGeometryByESRIType (
    esriShapeType shapeType,
    ref IGeometry outGeometry
);

IGeometryFactory.CreateEmptyGeometryByType Method

Creates an empty geometry of the specified ArcObjects geometry type.

Public Sub CreateEmptyGeometryByType ( _
    ByVal GeometryType As esriGeometryType, _
    ByRef outGeometry As IGeometry _
)

public void CreateEmptyGeometryByType (
    esriGeometryType GeometryType,
    ref IGeometry outGeometry
);

IGeometryFactory.CreateGeometry Method

Create a point, polyline, polygon, or multipoint from the specified shapefile format buffer.

Public Sub CreateGeometry ( _
    ByRef byteCountInOut As Integer, _
    ByRef geometryInfo As Byte&, _
    ByRef outGeometry As IGeometry _
)

public void CreateGeometry (
    ref int byteCountInOut,
    ref Byte& geometryInfo,
    ref IGeometry outGeometry
);

IGeometryFactory.CreateGeometryFromEnumerator Method

Creates a geometry bag containing references to geometries returned by the input geometry enumerator.

Public Function CreateGeometryFromEnumerator ( _
    ByVal geometries As IEnumGeometry _
) As IGeometry

public IGeometry CreateGeometryFromEnumerator (
    IEnumGeometry geometries
);

IGeometryFactory.CreateGeometryFromWkb Method

Create a point, polyline, polygon, or multipoint from the specified OGIS WKB format buffer.

Public Sub CreateGeometryFromWkb ( _
    ByRef byteCountInOut As Integer, _
    ByRef geometryInfo As Byte&, _
    ByRef outGeometry As IGeometry _
)

public void CreateGeometryFromWkb (
    ref int byteCountInOut,
    ref Byte& geometryInfo,
    ref IGeometry outGeometry
);

IGeometryFactory.CreateGeometryFromWkbVariant Method

Create a point, polyline, polygon, or multipoint from the specified OGIS WKB format buffer.

Public Sub CreateGeometryFromWkbVariant ( _
    ByVal wkb As Object, _
    ByRef outGeometry As IGeometry, _
    ByRef numBytesRead As Integer _
)

public void CreateGeometryFromWkbVariant (
    object wkb,
    ref IGeometry outGeometry,
    ref int numBytesRead
);

private void CreateGeometryFromWkbVariant()

{

  OleDbConnection connection = new OleDbConnection("Provider=ESRI.GeoDB.OLEDB.1;Data Source=   C:\\basiceditdatabase.mdb;ExtendedProperties=workspacetype=esriDataSourcesGDB.AccessWorkspaceFactory.1;Geometry=WKB");

  //create the command object with the sql query

  OleDbCommand command = new OleDbCommand("select * from line_edit", connection);

  try

  {

    connection.Open();

    //create the datareader object to connect to table

    OleDbDataReader reader = command.ExecuteReader();

    //Iterate through the geodatabase and add new Geometries to to GeometryBag

    IGeometryFactory2 factory = new GeometryEnvironmentClass();

    IGeometryCollection geometryCollection = new GeometryBagClass();

    IGeometry outGeometry;

    int bytesRead;

    object missing = Type.Missing;

    while (reader.Read())

    {

     int shapeColumn = reader.GetOrdinal("SHAPE");

     object byteArrayObject = reader.GetValue(shapeColumn);

     //Re-create the geometry from the WKB data

     factory.CreateGeometryFromWkbVariant(byteArrayObject, out outGeometry, out bytesRead);

     if(outGeometry!= null)

     {

       //add the geometry to the geometryColection's end

       geometryCollection.AddGeometry(outGeometry, ref missing, ref missing);

     }

    }

    //don't forget to clean up

    reader.Close();

    connection.Close();

    System.Windows.Forms.MessageBox.Show(geometryCollection.GeometryCount + " geomtries added");

  }

  //Some usual exception handling

  catch (OleDbException e)

  {

    System.Windows.Forms.MessageBox.Show("Error: {0}", e.Errors[0].Message);

  }

}

Dim pGFact As ESRI.ArcGIS.Geometry.IGeometryFactory

        Dim pGeoEnv As ESRI.ArcGIS.Geometry.GeometryEnvironment

        Dim pGeomCol As ESRI.ArcGIS.Geometry.IGeometryCollection

        Dim pGeom As ESRI.ArcGIS.Geometry.IGeometry

        Dim cBytesread As Long

        Dim pEnvelope As ESRI.ArcGIS.Geometry.IEnvelope

        Dim adors As ADODB.Recordset

        Dim adocon As ADODB.Connection

        Dim sConstring As String, sSQLstring As String

        Dim WKBData As Object

        pGeoEnv = New ESRI.ArcGIS.Geometry.GeometryEnvironment

        pEnvelope = New ESRI.ArcGIS.Geometry.Envelope

        pGFact = pGeoEnv

        adors = New ADODB.Recordset

        adocon = New ADODB.Connection

        sConstring = "Provider=ESRI.GeoDB.OLEDB.1;" & "Data Source=   d:\temp\us_states.mdb;" & "ExtendedProperties=workspacetype=esriDataSourcesGDB.AccessWorkspaceFactory.1;Geometry=WKB"

        sSQLstring = "select * from us_states"

        adocon.Open(sConstring)

        adors.Open(sSQLstring, adocon, ADODB.CursorTypeEnum.adOpenForwardOnly, ADODB.LockTypeEnum.adLockOptimistic)

        Do Until adors.EOF

            pGeomCol = New ESRI.ArcGIS.Geometry.GeometryBag

            WKBData = adors("Shape").Value

            If IsNothing(WKBData) Then

                adors.MoveNext()

            Else

                '++ Re-create the geometry from the WKB data

                pGFact.CreateGeometryFromWkbVariant(WKBData, pGeom, cBytesread)

                '++ Aggregate the geom envelopes

                pEnvelope.Union(pGeom.Envelope)

                pGeomCol.AddGeometry(pGeom)

                adors.MoveNext()

            End If

        Loop

Classes that implement IGeometryFactory

Classes	Description
GeometryEnvironment	Provides a way of creating geometries from different inputs and setting/getting global variables for controlling behavior of geometry methods.