Class WKBWriter

Writes a Well-Known Binary byte data representation of a Geometry.

Inheritance

object

WKBWriter

Inherited Members

object.Equals(object)

object.Equals(object, object)

object.GetHashCode()

object.GetType()

object.MemberwiseClone()

object.ReferenceEquals(object, object)

object.ToString()

Namespace: NetTopologySuite.IO

Assembly: NetTopologySuite.dll

Syntax

public class WKBWriter

Remarks

There are a few cases which are not specified in the standard. The implementation uses a representation which is compatible with other common spatial systems (notably, PostGIS).

LinearRingsare written as LineStrings.
Empty geometries are output as follows
- PointA WKBPoint with double.NaN ordinate values
- LineStringA WKBLineString with zero points
- Polygoncurrently output as a WKBPolygon with one LinearRing with zero points. Note: This is different to other systems. It will change to a WKBPolygon with zero LinearRings.
- Multi geometriesA WKBMulti with zero elements
- GeometryCollectionA WKBGeometryCollection with zero elements

This implementation supports the Extended WKB standard. Extended WKB allows writing 3-dimensional coordinates and the geometry SRID value. The presence of 3D coordinates is indicated by setting the high bit of the wkbType word. The presence of a SRID is indicated by setting the third bit of the wkbType word. EWKB format is upward-compatible with the original SFS WKB format.

SRID output is optimized, if specified. The top-level geometry has the SRID included. Child geometries have it included if their value differs from its parent.

This class supports reuse of a single instance to read multiple geometries. This class is not thread - safe; each thread should create its own instance.

Constructors

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WKBWriter()

Initializes writer with LittleIndian byte order.

Declaration

public WKBWriter()

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WKBWriter(ByteOrder)

Initializes writer with the specified byte order.

Declaration

public WKBWriter(ByteOrder encodingType)

Parameters

Type	Name	Description
ByteOrder	encodingType	Encoding type

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WKBWriter(ByteOrder, bool)

Initializes writer with the specified byte order.

Declaration

public WKBWriter(ByteOrder encodingType, bool handleSRID)

Parameters

Type	Name	Description
ByteOrder	encodingType	Encoding type
bool	handleSRID	SRID values, present or not, should be emitted.

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WKBWriter(ByteOrder, bool, bool)

Initializes writer with the specified byte order.

Declaration

public WKBWriter(ByteOrder encodingType, bool handleSRID, bool emitZ)

Parameters

Type	Name	Description
ByteOrder	encodingType	Encoding type
bool	handleSRID	SRID values, present or not, should be emitted.
bool	emitZ	Z values, present or not, should be emitted

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WKBWriter(ByteOrder, bool, bool, bool)

Initializes writer with the specified byte order.

Declaration

public WKBWriter(ByteOrder encodingType, bool handleSRID, bool emitZ, bool emitM)

Parameters

Type	Name	Description
ByteOrder	encodingType	Encoding type
bool	handleSRID	SRID values, present or not, should be emitted.
bool	emitZ	Z values, present or not, should be emitted
bool	emitM	M values, present or not, should be emitted

Fields

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AllowedOrdinates

Gets the Ordinates that this class can write.

Declaration

public static readonly Ordinates AllowedOrdinates

Field Value

Type	Description
Ordinates

Properties

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EncodingType

Gets or sets the binary encoding type

Declaration

public ByteOrder EncodingType { get; protected set; }

Property Value

Type	Description
ByteOrder

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HandleOrdinates

Gets or sets the maximum Ordinates to write out. The default is equivalent to AllowedOrdinates.

Declaration

public Ordinates HandleOrdinates { get; set; }

Property Value

Type	Description
Ordinates

Remarks

The purpose of this property is to restrict what gets written out to ensure that, e.g., Z values are never written out even if present on a geometry instance. Ordinates that are not present on a geometry instance will be omitted regardless of this value.

Flags not present in AllowedOrdinates are silently ignored.

X and Y are always present.

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HandleSRID

Gets or sets a value indicating if an encoded SRID value should be handled or ignored.

Declaration

public bool HandleSRID { get; set; }

Property Value

Type	Description
bool

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InitCount

Standard byte size for each complex point. Each complex point (LineString, Polygon, ...) contains: 1 byte for ByteOrder and 4 bytes for WKBType. 4 bytes for SRID value

Declaration

[Obsolete("Will be removed in a future version")]
protected int InitCount { get; }

Property Value

Type	Description
int

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Strict

Gets a value indicating if only original WKT elements should be handled

Declaration

public bool Strict { get; set; }

Property Value

Type	Description
bool

Methods

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GetBytes(Geometry)

Gets a buffer for the MemoryStream to write geometry to.

Declaration

[Obsolete("Will be removed in a future version.")]
protected byte[] GetBytes(Geometry geometry)

Parameters

Type	Name	Description
Geometry	geometry	The geometry to write

Returns

Type	Description
byte[]	A buffer

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SetByteStream(Geometry)

Computes the length of a buffer to write geometry in its WKB format.

Declaration

[Obsolete("Will be removed in a future version.")]
protected virtual int SetByteStream(Geometry geometry)

Parameters

Type	Name	Description
Geometry	geometry	The geometry

Returns

Type	Description
int	The number of bytes required to store `geometry` in its WKB format.

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SetByteStream(GeometryCollection)

Computes the length of a buffer to write the GeometryCollection geometry in its WKB format.

Declaration

[Obsolete("Will be removed in a future version.")]
protected int SetByteStream(GeometryCollection geometry)

Parameters

Type	Name	Description
GeometryCollection	geometry	The geometry

Returns

Type	Description
int	The number of bytes required to store `geometry` in its WKB format.

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SetByteStream(LineString)

Computes the length of a buffer to write the LineString geometry in its WKB format.

Declaration

[Obsolete("Will be removed in a future version.")]
protected int SetByteStream(LineString geometry)

Parameters

Type	Name	Description
LineString	geometry	The geometry

Returns

Type	Description
int	The number of bytes required to store `geometry` in its WKB format.

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SetByteStream(MultiLineString)

Computes the length of a buffer to write the MultiLineString geometry in its WKB format.

Declaration

[Obsolete("Will be removed in a future version.")]
protected int SetByteStream(MultiLineString geometry)

Parameters

Type	Name	Description
MultiLineString	geometry	The geometry

Returns

Type	Description
int	The number of bytes required to store `geometry` in its WKB format.

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SetByteStream(MultiPoint)

Computes the length of a buffer to write the MultiPoint geometry in its WKB format.

Declaration

[Obsolete("Will be removed in a future version.")]
protected int SetByteStream(MultiPoint geometry)

Parameters

Type	Name	Description
MultiPoint	geometry	The geometry

Returns

Type	Description
int	The number of bytes required to store `geometry` in its WKB format.

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SetByteStream(MultiPolygon)

Computes the length of a buffer to write the MultiPolygon geometry in its WKB format.

Declaration

[Obsolete("Will be removed in a future version.")]
protected int SetByteStream(MultiPolygon geometry)

Parameters

Type	Name	Description
MultiPolygon	geometry	The geometry

Returns

Type	Description
int	The number of bytes required to store `geometry` in its WKB format.

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SetByteStream(Point)

Computes the length of a buffer to write the Point geometry in its WKB format.

Declaration

[Obsolete("Will be removed in a future version.")]
protected int SetByteStream(Point geometry)

Parameters

Type	Name	Description
Point	geometry	The geometry

Returns

Type	Description
int	The number of bytes required to store `geometry` in its WKB format.

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SetByteStream(Polygon)

Computes the length of a buffer to write the Polygon geometry in its WKB format.

Declaration

[Obsolete("Will be removed in a future version.")]
protected int SetByteStream(Polygon geometry)

Parameters

Type	Name	Description
Polygon	geometry	The geometry

Returns

Type	Description
int	The number of bytes required to store `geometry` in its WKB format.

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ToHex(byte[])

Converts a byte array to a hexadecimal string.

Declaration

public static string ToHex(byte[] bytes)

Parameters

Type	Name	Description
byte[]	bytes	A byte array

Returns

Type	Description
string

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Write(Coordinate, BinaryWriter)

Write a Coordinate.

Declaration

[Obsolete("Will be removed in a future version")]
protected void Write(Coordinate coordinate, BinaryWriter writer)

Parameters

Type	Name	Description
Coordinate	coordinate	The coordinate
BinaryWriter	writer	The writer.

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Write(CoordinateSequence, bool, BinaryWriter)

Write a CoordinateSequence.

Declaration

[Obsolete("Will be made private in a future version.")]
protected void Write(CoordinateSequence sequence, bool emitSize, BinaryWriter writer)

Parameters

Type	Name	Description
CoordinateSequence	sequence	The coordinate sequence to write
bool	emitSize	A flag indicating if the size of `sequence` should be written, too.
BinaryWriter	writer	The writer.

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Write(Geometry)

Writes a WKB representation of a given point.

Declaration

public virtual byte[] Write(Geometry geometry)

Parameters

Type	Name	Description
Geometry	geometry

Returns

Type	Description
byte[]

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Write(Geometry, BinaryWriter)

Declaration

protected void Write(Geometry geometry, BinaryWriter writer)

Parameters

Type	Name	Description
Geometry	geometry
BinaryWriter	writer

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Write(Geometry, Stream)

Writes a WKB representation of a given point.

Declaration

public virtual void Write(Geometry geometry, Stream stream)

Parameters

Type	Name	Description
Geometry	geometry
Stream	stream

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Write(GeometryCollection, BinaryWriter)

Write a GeometryCollection in its WKB format

Declaration

[Obsolete("Will be removed in a future version.")]
protected void Write(GeometryCollection geomCollection, BinaryWriter writer)

Parameters

Type	Name	Description
GeometryCollection	geomCollection	The GeometryCollection
BinaryWriter	writer	The writer

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Write(LineString, BinaryWriter)

Write a LineString in its WKB format

Declaration

[Obsolete("Will be removed in a future version.")]
protected void Write(LineString lineString, BinaryWriter writer)

Parameters

Type	Name	Description
LineString	lineString	The LineString
BinaryWriter	writer	The writer

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Write(LinearRing, BinaryWriter)

Write LinearRing information

Declaration

[Obsolete("Will be removed in a future version.")]
protected void Write(LinearRing ring, BinaryWriter writer)

Parameters

Type	Name	Description
LinearRing	ring	The linear ring
BinaryWriter	writer	The writer

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Write(MultiLineString, BinaryWriter)

Write a MultiLineString in its WKB format

Declaration

[Obsolete("Will be removed in a future version.")]
protected void Write(MultiLineString multiLineString, BinaryWriter writer)

Parameters

Type	Name	Description
MultiLineString	multiLineString	The MultiLineString
BinaryWriter	writer	The writer

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Write(MultiPoint, BinaryWriter)

Write a MultiPoint in its WKB format

Declaration

[Obsolete("Will be removed in a future version.")]
protected void Write(MultiPoint multiPoint, BinaryWriter writer)

Parameters

Type	Name	Description
MultiPoint	multiPoint	The MultiPoint
BinaryWriter	writer	The writer

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Write(MultiPolygon, BinaryWriter)

Write a MultiPolygon in its WKB format

Declaration

[Obsolete("Will be removed in a future version.")]
protected void Write(MultiPolygon multiPolygon, BinaryWriter writer)

Parameters

Type	Name	Description
MultiPolygon	multiPolygon	The MultiPolygon
BinaryWriter	writer	The writer

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Write(Point, BinaryWriter)

Write a point in its WKB format

Declaration

[Obsolete("Will be removed in a future version.")]
protected void Write(Point point, BinaryWriter writer)

Parameters

Type	Name	Description
Point	point	The point
BinaryWriter	writer	The writer

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Write(Polygon, BinaryWriter)

Write a Polygon in its WKB format

Declaration

[Obsolete("Will be removed in a future version.")]
protected void Write(Polygon polygon, BinaryWriter writer)

Parameters

Type	Name	Description
Polygon	polygon	The Polygon
BinaryWriter	writer	The writer

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WriteByteOrder(BinaryWriter)

Writes the ByteOrder defined in EncodingType.

Declaration

[Obsolete("Will be made private in a future version.")]
protected void WriteByteOrder(BinaryWriter writer)

Parameters

Type	Name	Description
BinaryWriter	writer	The writer to use