public ShapeReader(IStreamProviderRegistry streamProviderRegistry) { if (streamProviderRegistry == null) { throw new ArgumentNullException("streamProviderRegistry"); } m_StreamProviderRegistry = streamProviderRegistry; ShapefileHeader = new ShapefileHeader(ShapeReaderStream); m_ShapeHandler = Shapefile.GetShapeHandler(ShapefileHeader.ShapeType); m_ShapeOffsetCache = new Lazy <long[]>(BuildOffsetCache, LazyThreadSafetyMode.ExecutionAndPublication); }
public ShapeReader(string shapeFilePath) { if (shapeFilePath == null) { throw new ArgumentNullException("shapeFilePath"); } if (string.IsNullOrWhiteSpace(shapeFilePath)) { throw new ArgumentException("shapeFilePath", "Path to shapefile can't be empty"); } if (!File.Exists(shapeFilePath)) { throw new FileNotFoundException("Given shapefile doesn't exist", shapeFilePath); } m_ShapeFilePath = shapeFilePath; m_ShapeFileHeader = new ShapefileHeader(ShapeReaderStream); m_ShapeHandler = Shapefile.GetShapeHandler(ShapefileHeader.ShapeType); m_ShapeOffsetCache = new Lazy <long[]>(BuildOffsetCache, LazyThreadSafetyMode.ExecutionAndPublication); }
/// <summary> /// Writes a shapefile to disk. /// </summary> /// <remarks> /// Assumes the type given for the first geometry is the same for all subsequent geometries. /// For example, is, if the first Geometry is a Multi-polygon/ Polygon, the subsequent geometies are /// Muli-polygon/ polygon and not lines or points. /// The dbase file for the corresponding shapefile contains one column called row. It contains /// the row number. /// </remarks> /// <param name="filename">The filename to write to (minus the .shp extension).</param> /// <param name="geometryCollection">The GeometryCollection to write.</param> public void Write(IGeometryCollection geometryCollection) { //FileStream shpStream = new FileStream(filename + ".shp", FileMode.Create); //FileStream shxStream = new FileStream(filename + ".shx", FileMode.Create); shpStream = new MemoryStream(); shxStream = new MemoryStream(); BigEndianBinaryWriter shpBinaryWriter = new BigEndianBinaryWriter(shpStream); BigEndianBinaryWriter shxBinaryWriter = new BigEndianBinaryWriter(shxStream); // assumes ShapeHandler handler = Shapefile.GetShapeHandler(GetShapeType(geometryCollection.Geometries[0])); IGeometry body; int numShapes = geometryCollection.NumGeometries; // calc the length of the shp file, so it can put in the header. int shpLength = 50; for (int i = 0; i < numShapes; i++) { body = (IGeometry)geometryCollection.Geometries[i]; shpLength += 4; // length of header in WORDS shpLength += handler.ComputeRequiredLengthInWords(body); // length of shape in WORDS } int shxLength = 50 + (4 * numShapes); // write the .shp header ShapefileHeader shpHeader = new ShapefileHeader(); shpHeader.FileLength = shpLength; // get envelope in external coordinates Envelope env = geometryCollection.EnvelopeInternal as Envelope; Envelope bounds = ShapeHandler.GetEnvelopeExternal(geometryFactory.PrecisionModel, env); shpHeader.Bounds = bounds; // assumes Geometry type of the first item will the same for all other items // in the collection. shpHeader.ShapeType = GetShapeType(geometryCollection.Geometries[0]); shpHeader.Write(shpBinaryWriter); // write the .shx header ShapefileHeader shxHeader = new ShapefileHeader(); shxHeader.FileLength = shxLength; shxHeader.Bounds = shpHeader.Bounds; // assumes Geometry type of the first item will the same for all other items in the collection. shxHeader.ShapeType = GetShapeType(geometryCollection.Geometries[0]); shxHeader.Write(shxBinaryWriter); // write the individual records. int _pos = 50; // header length in WORDS for (int i = 0; i < numShapes; i++) { body = geometryCollection.Geometries[i]; int recordLength = handler.ComputeRequiredLengthInWords(body); shpBinaryWriter.WriteIntBE(i + 1); shpBinaryWriter.WriteIntBE(recordLength); shxBinaryWriter.WriteIntBE(_pos); shxBinaryWriter.WriteIntBE(recordLength); _pos += 4; // length of header in WORDS handler.Write(body, shpBinaryWriter, geometryFactory); _pos += recordLength; // length of shape in WORDS } shxBinaryWriter.Flush(); //shxStream.Seek(0, SeekOrigin.Begin); ////shxBinaryWriter.Close(); shpBinaryWriter.Flush(); //shpStream.Seek(0, SeekOrigin.Begin); //shpBinaryWriter.Close(); // WriteDummyDbf(filename + ".dbf", numShapes); }