ExportToWKB(WkbExportFlags,Geometry) Method

In This Topic

Writes an OGC well-known binary formatted version of the input geometry to a buffer.

Syntax

C#
Visual Basic (Declaration)

byte[] ExportToWKB( 
   WkbExportFlags exportFlags,
   Geometry geometry
)

Overloads Function ExportToWKB( _
   ByVal exportFlags As WkbExportFlags, _
   ByVal geometry As Geometry _
) As Byte()

Parameters

exportFlags: A combination of WkbExportFlags which determines how the geometry is exported.
geometry: The geometry to write to the buffer.

Return Value

An OGC well-known binary formatted buffer.

Exceptions

Exception	Description
System.ArgumentNullException	Geometry is null or empty.
System.NotImplementedException	The method is not implemented for GeometryBag or Multipatch.
System.NotImplementedException	The method is not implemented for geometry with curves.

Remarks

Does not support curves. Also, note that if the contains ID information, this property will not be preserved in the export operation. The WKB OGC standard does not contain the ID property.

Example

Import and Export Geometries to well-known Binary

// create a polyline
List<Coordinate2D> coords = new List<Coordinate2D>
{
  new Coordinate2D(0, 0),
  new Coordinate2D(0, 1),
  new Coordinate2D(1, 1),
  new Coordinate2D(1, 0)
};

Polyline polyline = PolylineBuilderEx.CreatePolyline(
            coords, SpatialReferences.WGS84);

WkbExportFlags wkbExportFlags = WkbExportFlags.WkbExportDefaults;
WkbImportFlags wkbImportFlags = WkbImportFlags.WkbImportDefaults;

// export and import
byte[] buffer = GeometryEngine.Instance.ExportToWKB(wkbExportFlags, polyline);
Geometry geometry = GeometryEngine.Instance.ImportFromWKB(
               wkbImportFlags, buffer, SpatialReferences.WGS84);
Polyline importPolyline = geometry as Polyline;


// alternatively, determine the size for the buffer
int bufferSize = GeometryEngine.Instance.GetWKBSize(wkbExportFlags, polyline);
buffer = new byte[bufferSize];
// export
bufferSize = GeometryEngine.Instance.ExportToWKB(
                wkbExportFlags, polyline, ref buffer);
// import
importPolyline = GeometryEngine.Instance.ImportFromWKB(
         wkbImportFlags, buffer, SpatialReferences.WGS84) as Polyline;

Requirements

Target Platforms: Windows 11, Windows 10, Windows 8.1

Reference

IGeometryEngine Interface
IGeometryEngine Members
Overload List

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