private int GetPointCountByMultiPoint(FileStream fs, BinaryReader br, int oid)
        {
            int pointCount = ToLocalEndian.ToInt32FromLittle(br.ReadBytes(4));

            //fs.Seek(pointCount * 2 * 8, SeekOrigin.Current);
            return(pointCount);
        }
        private int GetPointCount(byte[] contentBytes, int oid, FileStream fs)
        {
            using (MemoryStream ms = new MemoryStream(contentBytes))
            {
                using (BinaryReader br = new BinaryReader(ms))
                {
                    enumShapeType shapeType = (enumShapeType)ToLocalEndian.ToInt32FromLittle(br.ReadBytes(4));
                    switch (shapeType)
                    {
                    case enumShapeType.NullShape:
                        break;

                    case enumShapeType.Point:
                        return(GetPointCountByPoint(fs, br, oid));

                    case enumShapeType.MultiPoint:
                        return(GetPointCountByMultiPoint(fs, br, oid));

                    case enumShapeType.Polyline:
                        return(GetPointCountByPolyline(fs, br, oid));

                    case enumShapeType.PolylineM:
                        return(GetPointCoungByPolylineM(fs, br, oid));

                    case enumShapeType.Polygon:
                        return(GetPointCountByPolygon(fs, br, oid));

                    default:
                        return(0);
                    }
                    return(0);
                }
            }
        }
        private long GetHeaderSizeAndFileLength(FileStream fsMainFile, BinaryReader brMainFile, out int fileLength)
        {
            //FileCode
            int fileCode = ToLocalEndian.ToInt32FromBig(brMainFile.ReadBytes(4));

            if (fileCode != 9994)
            {
                throw new Exception("文件不是ESRI Shape Files文件头!");
            }
            //Skip 20 bytes unused (5 integer)
            brMainFile.ReadBytes(20);
            //File length
            fileLength = ToLocalEndian.ToInt32FromBig(brMainFile.ReadBytes(4)) * 2;
            if (fileLength != fsMainFile.Length)
            {
                throw new Exception("ESRI Shape Files文件未正确结束!");
            }
            //Version
            int Version = ToLocalEndian.ToInt32FromLittle(brMainFile.ReadBytes(4));
            //Shape Type
            int ShapeType = ToLocalEndian.ToInt32FromLittle(brMainFile.ReadBytes(4));
            //
            Envelope evp = new Envelope();

            evp.MinX = ToLocalEndian.ToDouble64FromLittle(brMainFile.ReadBytes(8));
            evp.MinY = ToLocalEndian.ToDouble64FromLittle(brMainFile.ReadBytes(8));
            evp.MaxX = ToLocalEndian.ToDouble64FromLittle(brMainFile.ReadBytes(8));
            evp.MaxY = ToLocalEndian.ToDouble64FromLittle(brMainFile.ReadBytes(8));
            //Skip minZ,maxZ,minM,maxM
            brMainFile.ReadBytes(8 * 4);
            return(fsMainFile.Position);
        }
        protected override object ConstructFeature(BinaryReader br, int oid)
        {
            enumShapeType shapeType = (enumShapeType)ToLocalEndian.ToInt32FromLittle(br.ReadBytes(4));

            switch (shapeType)
            {
            case enumShapeType.NullShape:
                break;

            case enumShapeType.Point:
                return(ConstructPoint(br, oid));

            case enumShapeType.MultiPoint:
                return(ConstructMultiPoint(br, oid));

            case enumShapeType.Polyline:
                return(ConstructPolyline(br, oid));

            case enumShapeType.PolylineM:
                return(ConstructPolylineM(br, oid));

            case enumShapeType.Polygon:
                return(ConstructPolygon(br, oid));

            default:
                return(null);
            }
            return(null);
        }
예제 #5
0
        private void ReadHeader()
        {
            //FileCode
            int fileCode = ToLocalEndian.ToInt32FromBig(_brMainFile.ReadBytes(4));

            if (fileCode != 9994)
            {
                throw new Exception("文件不是ESRI Shape Files文件头!");
            }
            //Skip 20 bytes unused (5 integer)
            _brMainFile.ReadBytes(20);
            //File length
            _fileLength = ToLocalEndian.ToInt32FromBig(_brMainFile.ReadBytes(4)) * 2;
            if (_fileLength != _fsMainFile.Length)
            {
                throw new Exception("ESRI Shape Files文件未正确结束!");
            }
            //Version
            int Version = ToLocalEndian.ToInt32FromLittle(_brMainFile.ReadBytes(4));
            //Shape Type
            int ShapeType = ToLocalEndian.ToInt32FromLittle(_brMainFile.ReadBytes(4));

            _shapeType     = (enumShapeType)ShapeType;
            _envelope.MinX = ToLocalEndian.ToDouble64FromLittle(_brMainFile.ReadBytes(8));
            _envelope.MinY = ToLocalEndian.ToDouble64FromLittle(_brMainFile.ReadBytes(8));
            _envelope.MaxX = ToLocalEndian.ToDouble64FromLittle(_brMainFile.ReadBytes(8));
            _envelope.MaxY = ToLocalEndian.ToDouble64FromLittle(_brMainFile.ReadBytes(8));
            AdjustZeroWidthEnvelope(_envelope);
            //Skip minZ,maxZ,minM,maxM
            _brMainFile.ReadBytes(8 * 4);
            _fileHeaderSize = _fsMainFile.Position;
        }
예제 #6
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        private void WriteShapeMultiPointRecords(Feature[] vfs)
        {
            //the fist record offset in 16-bit word
            byte[]          byteArray;
            ShapeMultiPoint mulPoint;
            Int32           contentLength;

            if (_currentShxRecondPosition != 0)
            {
                _fsShxFile.Seek(_currentShxRecondPosition, SeekOrigin.Begin);
            }
            if (_currentShpRecondPosition != 0)
            {
                _fsMainFile.Seek(_currentShpRecondPosition, SeekOrigin.Begin);
            }
            for (int i = 0; i < vfs.Length; i++)
            {
                mulPoint      = vfs[i].Geometry as ShapeMultiPoint;
                contentLength = (mulPoint.Points.Length * 16 + 48) / 2;

                byteArray = BitConverter.GetBytes(_featuresCount + i + 1);
                _bwMainFile.Write(ToLocalEndian.ToInt32FromBig(byteArray));

                byteArray = BitConverter.GetBytes(contentLength);
                _bwMainFile.Write(ToLocalEndian.ToInt32FromBig(byteArray));

                _bwShxFile.Write(ToLocalEndian.ToInt32FromBig(byteArray));
                byteArray = BitConverter.GetBytes(_offset);
                _bwShxFile.Write(ToLocalEndian.ToInt32FromBig(byteArray));
                _offset += contentLength;

                byteArray = BitConverter.GetBytes((int)_shapeType);
                _bwMainFile.Write(ToLocalEndian.ToInt32FromLittle(byteArray));

                byteArray = BitConverter.GetBytes(mulPoint.Envelope.MinX);
                _bwMainFile.Write(ToLocalEndian.ToInt64FromLittle(byteArray));

                byteArray = BitConverter.GetBytes(mulPoint.Envelope.MinY);
                _bwMainFile.Write(ToLocalEndian.ToInt64FromLittle(byteArray));

                byteArray = BitConverter.GetBytes(mulPoint.Envelope.MaxX);
                _bwMainFile.Write(ToLocalEndian.ToInt64FromLittle(byteArray));

                byteArray = BitConverter.GetBytes(mulPoint.Envelope.MaxY);
                _bwMainFile.Write(ToLocalEndian.ToInt64FromLittle(byteArray));

                byteArray = BitConverter.GetBytes(mulPoint.Points.Length);
                _bwMainFile.Write(ToLocalEndian.ToInt32FromLittle(byteArray));

                foreach (ShapePoint sp in mulPoint.Points)
                {
                    byteArray = BitConverter.GetBytes(sp.X);
                    _bwMainFile.Write(ToLocalEndian.ToInt64FromLittle(byteArray));
                    byteArray = BitConverter.GetBytes(sp.Y);
                    _bwMainFile.Write(ToLocalEndian.ToInt64FromLittle(byteArray));
                }
            }
            _currentShpRecondPosition = _fsMainFile.Position;
            _currentShxRecondPosition = _fsShxFile.Position;
        }
예제 #7
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        private void WriteShapePointRecords(Feature[] vfs)
        {
            //the fist record offset in 16-bit word
            Int32 Offset = 50;

            byte[]     byteArray;
            ShapePoint point;


            for (int i = 0; i < vfs.Length; i++)
            {
                point = vfs[i].Geometry as ShapePoint;

                byteArray = BitConverter.GetBytes(i + 1);
                _bwMainFile.Write(ToLocalEndian.ToInt32FromBig(byteArray));

                byteArray = BitConverter.GetBytes(14);
                _bwMainFile.Write(ToLocalEndian.ToInt32FromBig(byteArray));
                ////
                _bwShxFile.Write(ToLocalEndian.ToInt32FromBig(byteArray));
                byteArray = BitConverter.GetBytes(Offset);
                _bwShxFile.Write(ToLocalEndian.ToInt32FromBig(byteArray));
                Offset += 14;
                ////
                byteArray = BitConverter.GetBytes((int)_shapeType);
                _bwMainFile.Write(ToLocalEndian.ToInt32FromLittle(byteArray));

                byteArray = BitConverter.GetBytes(point.X);
                _bwMainFile.Write(ToLocalEndian.ToInt64FromLittle(byteArray));

                byteArray = BitConverter.GetBytes(point.Y);
                _bwMainFile.Write(ToLocalEndian.ToInt64FromLittle(byteArray));
            }
        }
예제 #8
0
        private void WriteShapeMultiPointRecords(Feature[] vfs)
        {
            //the fist record offset in 16-bit word
            Int32 Offset = 50;

            byte[]          byteArray;
            ShapeMultiPoint mulPoint;
            Int32           contentLength;

            for (int i = 0; i < vfs.Length; i++)
            {
                mulPoint      = vfs[i].Geometry as ShapeMultiPoint;
                contentLength = (mulPoint.Points.Length * 16 + 48) / 2;

                byteArray = BitConverter.GetBytes(i + 1);
                _bwMainFile.Write(ToLocalEndian.ToInt32FromBig(byteArray));

                byteArray = BitConverter.GetBytes(contentLength);
                _bwMainFile.Write(ToLocalEndian.ToInt32FromBig(byteArray));

                ////
                _bwShxFile.Write(ToLocalEndian.ToInt32FromBig(byteArray));
                byteArray = BitConverter.GetBytes(Offset);
                _bwShxFile.Write(ToLocalEndian.ToInt32FromBig(byteArray));
                Offset += contentLength;
                ////

                byteArray = BitConverter.GetBytes((int)_shapeType);
                _bwMainFile.Write(ToLocalEndian.ToInt32FromLittle(byteArray));

                byteArray = BitConverter.GetBytes(mulPoint.Envelope.MinX);
                _bwMainFile.Write(ToLocalEndian.ToInt64FromLittle(byteArray));

                byteArray = BitConverter.GetBytes(mulPoint.Envelope.MinY);
                _bwMainFile.Write(ToLocalEndian.ToInt64FromLittle(byteArray));

                byteArray = BitConverter.GetBytes(mulPoint.Envelope.MaxX);
                _bwMainFile.Write(ToLocalEndian.ToInt64FromLittle(byteArray));

                byteArray = BitConverter.GetBytes(mulPoint.Envelope.MaxY);
                _bwMainFile.Write(ToLocalEndian.ToInt64FromLittle(byteArray));

                byteArray = BitConverter.GetBytes(mulPoint.Points.Length);
                _bwMainFile.Write(ToLocalEndian.ToInt32FromLittle(byteArray));

                foreach (ShapePoint sp in mulPoint.Points)
                {
                    byteArray = BitConverter.GetBytes(sp.X);
                    _bwMainFile.Write(ToLocalEndian.ToInt64FromLittle(byteArray));

                    byteArray = BitConverter.GetBytes(sp.Y);
                    _bwMainFile.Write(ToLocalEndian.ToInt64FromLittle(byteArray));
                }
            }
        }
        private int GetPointCountByPolygon(FileStream fs, BinaryReader br, int oid)
        {
            Envelope evp = new Envelope(ToLocalEndian.ToDouble64FromLittle(br.ReadBytes(8)),
                                        ToLocalEndian.ToDouble64FromLittle(br.ReadBytes(8)),
                                        ToLocalEndian.ToDouble64FromLittle(br.ReadBytes(8)),
                                        ToLocalEndian.ToDouble64FromLittle(br.ReadBytes(8)));
            int nParts  = ToLocalEndian.ToInt32FromLittle(br.ReadBytes(4));
            int nPoints = ToLocalEndian.ToInt32FromLittle(br.ReadBytes(4));

            //fs.Seek(nParts * 4, SeekOrigin.Current);
            //fs.Seek(nPoints * 2 * 8, SeekOrigin.Current);
            return(nPoints);
        }
        private object ConstructMultiPoint(BinaryReader br, int oid)
        {
            int pointCount = ToLocalEndian.ToInt32FromLittle(br.ReadBytes(4));

            ShapePoint[] pts = new ShapePoint[pointCount];
            for (int i = 0; i < pts.Length; i++)
            {
                pts[i] = new ShapePoint(ToLocalEndian.ToDouble64FromLittle(br.ReadBytes(8)), ToLocalEndian.ToDouble64FromLittle(br.ReadBytes(8)));
            }
            ShapeMultiPoint multiPoint = new ShapeMultiPoint(pts);
            Feature         f          = new Feature(oid, multiPoint, GetFieldNames(), GetFieldValues(oid), GetAnnotation(oid));

            return(f);
        }
        private object ConstructPolylineM(BinaryReader br, int oid)
        {
            Envelope evp = new Envelope(ToLocalEndian.ToDouble64FromLittle(br.ReadBytes(8)),
                                        ToLocalEndian.ToDouble64FromLittle(br.ReadBytes(8)),
                                        ToLocalEndian.ToDouble64FromLittle(br.ReadBytes(8)),
                                        ToLocalEndian.ToDouble64FromLittle(br.ReadBytes(8)));
            int nParts  = ToLocalEndian.ToInt32FromLittle(br.ReadBytes(4));
            int nPoints = ToLocalEndian.ToInt32FromLittle(br.ReadBytes(4));

            int[] firstPoints = new int[nParts];
            for (int i = 0; i < nParts; i++)
            {
                firstPoints[i] = ToLocalEndian.ToInt32FromLittle(br.ReadBytes(4));
            }
            ShapePoint[] pts = new ShapePoint[nPoints];
            for (int i = 0; i < nPoints; i++)
            {
                pts[i] = new ShapePoint(ToLocalEndian.ToDouble64FromLittle(br.ReadBytes(8)),
                                        ToLocalEndian.ToDouble64FromLittle(br.ReadBytes(8)));
            }
            //ShapeLineString
            ShapeLineString[] Lines = new ShapeLineString[nParts];
            for (int i = 0; i < nParts; i++)
            {
                int bIdx = firstPoints[i];
                int eIdx = 0;
                if (nParts == 1 || i == nParts - 1)
                {
                    eIdx = nPoints;
                }
                else
                {
                    eIdx = firstPoints[i + 1];
                }
                ShapePoint[] rpts = new ShapePoint[eIdx - bIdx];
                for (int j = bIdx; j < eIdx; j++)
                {
                    rpts[j - bIdx] = pts[j];
                }
                Lines[i] = new ShapeLineString(rpts);
            }
            //
            br.ReadBytes(2 * 8);       //M Range
            br.ReadBytes(nPoints * 8); //M Array
            //
            ShapePolyline ply = new ShapePolyline(Lines, evp);
            Feature       f   = new Feature(oid, ply, GetFieldNames(), GetFieldValues(oid), GetAnnotation(oid));

            return(f);
        }
예제 #12
0
        private void WriteShapePointRecords(Feature[] vfs)
        {
            //the fist record offset in 16-bit word
            byte[]     byteArray;
            ShapePoint point;

            if (_currentShxRecondPosition != 0)
            {
                _fsShxFile.Seek(_currentShxRecondPosition, SeekOrigin.Begin);
            }
            if (_currentShpRecondPosition != 0)
            {
                _fsMainFile.Seek(_currentShpRecondPosition, SeekOrigin.Begin);
            }
            for (int i = 0; i < vfs.Length; i++)
            {
                point = vfs[i].Geometry as ShapePoint;

                byteArray = BitConverter.GetBytes(_featuresCount + i + 1);
                _bwMainFile.Write(ToLocalEndian.ToInt32FromBig(byteArray));

                byteArray = BitConverter.GetBytes(10);
                _bwMainFile.Write(ToLocalEndian.ToInt32FromBig(byteArray));

                _bwShxFile.Write(ToLocalEndian.ToInt32FromBig(byteArray));
                byteArray = BitConverter.GetBytes(_offset);
                _bwShxFile.Write(ToLocalEndian.ToInt32FromBig(byteArray));
                _offset += 14;

                byteArray = BitConverter.GetBytes((int)_shapeType);
                _bwMainFile.Write(ToLocalEndian.ToInt32FromLittle(byteArray));

                byteArray = BitConverter.GetBytes(point.X);
                _bwMainFile.Write(ToLocalEndian.ToInt64FromLittle(byteArray));

                byteArray = BitConverter.GetBytes(point.Y);
                _bwMainFile.Write(ToLocalEndian.ToInt64FromLittle(byteArray));
            }
            _currentShpRecondPosition = _fsMainFile.Position;
            _currentShxRecondPosition = _fsShxFile.Position;
        }
예제 #13
0
        private void WriteShapePolygonRecords(Feature[] vfs)
        {
            //the fist record offset in 16-bit word
            byte[]       byteArray;
            ShapePolygon polygon;
            Int32        contentLength;
            Int32        pointsNum = 0;
            Int32        index     = 0;

            if (_currentShxRecondPosition != 0)
            {
                _fsShxFile.Seek(_currentShxRecondPosition, SeekOrigin.Begin);
            }
            if (_currentShpRecondPosition != 0)
            {
                _fsMainFile.Seek(_currentShpRecondPosition, SeekOrigin.Begin);
            }
            for (int i = 0; i < vfs.Length; i++)
            {
                polygon = vfs[i].Geometry as ShapePolygon;

                pointsNum     = 0;
                index         = 0;
                contentLength = (44 + polygon.Rings.Length * 4) / 2;
                foreach (ShapeRing part in polygon.Rings)
                {
                    contentLength += part.Points.Length * 8;
                    pointsNum     += part.Points.Length;
                }
                byteArray = BitConverter.GetBytes(_featuresCount + i + 1);
                _bwMainFile.Write(ToLocalEndian.ToInt32FromBig(byteArray));

                byteArray = BitConverter.GetBytes(_offset);
                _bwShxFile.Write(ToLocalEndian.ToInt32FromBig(byteArray));
                _offset += contentLength + 4;

                byteArray = BitConverter.GetBytes(contentLength);
                _bwMainFile.Write(ToLocalEndian.ToInt32FromBig(byteArray));

                _bwShxFile.Write(ToLocalEndian.ToInt32FromBig(byteArray));

                byteArray = BitConverter.GetBytes((int)_shapeType);
                _bwMainFile.Write(ToLocalEndian.ToInt32FromLittle(byteArray));

                byteArray = BitConverter.GetBytes(polygon.Envelope.MinX);
                _bwMainFile.Write(ToLocalEndian.ToInt64FromLittle(byteArray));

                byteArray = BitConverter.GetBytes(polygon.Envelope.MinY);
                _bwMainFile.Write(ToLocalEndian.ToInt64FromLittle(byteArray));

                byteArray = BitConverter.GetBytes(polygon.Envelope.MaxX);
                _bwMainFile.Write(ToLocalEndian.ToInt64FromLittle(byteArray));

                byteArray = BitConverter.GetBytes(polygon.Envelope.MaxY);
                _bwMainFile.Write(ToLocalEndian.ToInt64FromLittle(byteArray));

                byteArray = BitConverter.GetBytes(polygon.Rings.Length);
                _bwMainFile.Write(ToLocalEndian.ToInt32FromLittle(byteArray));

                byteArray = BitConverter.GetBytes(pointsNum);
                _bwMainFile.Write(ToLocalEndian.ToInt32FromLittle(byteArray));

                foreach (ShapeRing sr in polygon.Rings)
                {
                    byteArray = BitConverter.GetBytes(index);
                    _bwMainFile.Write(ToLocalEndian.ToInt32FromLittle(byteArray));
                    index += sr.Points.Length;
                }
                foreach (ShapeRing sr in polygon.Rings)
                {
                    foreach (ShapePoint sp in sr.Points)
                    {
                        byteArray = BitConverter.GetBytes(sp.X);
                        _bwMainFile.Write(ToLocalEndian.ToInt64FromLittle(byteArray));

                        byteArray = BitConverter.GetBytes(sp.Y);
                        _bwMainFile.Write(ToLocalEndian.ToInt64FromLittle(byteArray));
                    }
                }
            }
            _currentShpRecondPosition = _fsMainFile.Position;
            _currentShxRecondPosition = _fsShxFile.Position;
        }
예제 #14
0
        private void WriteVectorDataToFiles(Feature[] features)
        {
            byte[] byteArray;

            Envelope env = new Envelope(double.MaxValue, double.MaxValue, double.MinValue, double.MinValue);

            foreach (Feature vf in features)
            {
                env.UnionWith(vf.Geometry.Envelope);
            }

            ////write main file
            //write main file and shx file header
            byteArray = BitConverter.GetBytes(9994);
            _bwMainFile.Write(ToLocalEndian.ToInt32FromBig(byteArray));
            _bwShxFile.Write(ToLocalEndian.ToInt32FromBig(byteArray));

            byteArray = new byte[20];
            _bwMainFile.Write(byteArray);
            _bwShxFile.Write(byteArray);

            ////
            byteArray = BitConverter.GetBytes(CalculateMainfileLengthInByte(features) / 2);
            _bwMainFile.Write(ToLocalEndian.ToInt32FromBig(byteArray));
            byteArray = BitConverter.GetBytes(CalculateShxfileLenthInByte(features) / 2);
            _bwShxFile.Write(ToLocalEndian.ToInt32FromBig(byteArray));
            ////

            byteArray = BitConverter.GetBytes(1000);
            _bwMainFile.Write(ToLocalEndian.ToInt32FromLittle(byteArray));
            _bwShxFile.Write(ToLocalEndian.ToInt32FromLittle(byteArray));

            byteArray = BitConverter.GetBytes((int)_shapeType);
            _bwMainFile.Write(ToLocalEndian.ToInt32FromLittle(byteArray));
            _bwShxFile.Write(ToLocalEndian.ToInt32FromLittle(byteArray));


            byteArray = BitConverter.GetBytes(env.MinX);
            _bwMainFile.Write(ToLocalEndian.ToInt64FromLittle(byteArray));
            _bwShxFile.Write(ToLocalEndian.ToInt64FromLittle(byteArray));

            byteArray = BitConverter.GetBytes(env.MinY);
            _bwMainFile.Write(ToLocalEndian.ToInt64FromLittle(byteArray));
            _bwShxFile.Write(ToLocalEndian.ToInt64FromLittle(byteArray));

            byteArray = BitConverter.GetBytes(env.MaxX);
            _bwMainFile.Write(ToLocalEndian.ToInt64FromLittle(byteArray));
            _bwShxFile.Write(ToLocalEndian.ToInt64FromLittle(byteArray));

            byteArray = BitConverter.GetBytes(env.MaxY);
            _bwMainFile.Write(ToLocalEndian.ToInt64FromLittle(byteArray));
            _bwShxFile.Write(ToLocalEndian.ToInt64FromLittle(byteArray));

            byteArray = new byte[32];
            _bwMainFile.Write(byteArray);
            _bwShxFile.Write(byteArray);

            //write main file and Shx file records

            switch (_shapeType)
            {
            case enumShapeType.Point:
                WriteShapePointRecords(features);
                break;

            case enumShapeType.MultiPoint:
                WriteShapeMultiPointRecords(features);
                break;

            case enumShapeType.Polyline:
                WriteShapePolylineRecords(features);
                break;

            case enumShapeType.Polygon:
                WriteShapePolygonRecords(features);
                break;

            default:
                break;
            }


            ////write prj file,leave it now,no spec

            CloseVectorDataFiles();
        }
예제 #15
0
        private void WriteShapePolygonRecords(Feature[] vfs)
        {
            //the fist record offset in 16-bit word
            Int32 Offset = 50;

            byte[]       byteArray;
            ShapePolygon polygon;
            Int32        contentLength;
            Int32        pointsNum = 0;
            Int32        index     = 0;

            for (int i = 0; i < vfs.Length; i++)
            {
                polygon = vfs[i].Geometry as ShapePolygon;

                pointsNum     = 0;
                index         = 0;
                contentLength = (44 + polygon.Rings.Length * 4) / 2;
                foreach (ShapeRing part in polygon.Rings)
                {
                    contentLength += part.Points.Length * 8;
                    pointsNum     += part.Points.Length;
                }



                byteArray = BitConverter.GetBytes(i + 1);
                _bwMainFile.Write(ToLocalEndian.ToInt32FromBig(byteArray));

                ////
                byteArray = BitConverter.GetBytes(Offset);
                _bwShxFile.Write(ToLocalEndian.ToInt32FromBig(byteArray));
                Offset += contentLength + 4;
                ////


                byteArray = BitConverter.GetBytes(contentLength);
                _bwMainFile.Write(ToLocalEndian.ToInt32FromBig(byteArray));

                ////
                _bwShxFile.Write(ToLocalEndian.ToInt32FromBig(byteArray));

                ////

                byteArray = BitConverter.GetBytes((int)_shapeType);
                _bwMainFile.Write(ToLocalEndian.ToInt32FromLittle(byteArray));

                byteArray = BitConverter.GetBytes(polygon.Envelope.MinX);
                _bwMainFile.Write(ToLocalEndian.ToInt64FromLittle(byteArray));

                byteArray = BitConverter.GetBytes(polygon.Envelope.MinY);
                _bwMainFile.Write(ToLocalEndian.ToInt64FromLittle(byteArray));

                byteArray = BitConverter.GetBytes(polygon.Envelope.MaxX);
                _bwMainFile.Write(ToLocalEndian.ToInt64FromLittle(byteArray));

                byteArray = BitConverter.GetBytes(polygon.Envelope.MaxY);
                _bwMainFile.Write(ToLocalEndian.ToInt64FromLittle(byteArray));

                byteArray = BitConverter.GetBytes(polygon.Rings.Length);
                _bwMainFile.Write(ToLocalEndian.ToInt32FromLittle(byteArray));

                byteArray = BitConverter.GetBytes(pointsNum);
                _bwMainFile.Write(ToLocalEndian.ToInt32FromLittle(byteArray));

                foreach (ShapeRing sr in polygon.Rings)
                {
                    byteArray = BitConverter.GetBytes(index);
                    _bwMainFile.Write(ToLocalEndian.ToInt32FromLittle(byteArray));
                    index += sr.Points.Length;
                }
                foreach (ShapeRing sr in polygon.Rings)
                {
                    foreach (ShapePoint sp in sr.Points)
                    {
                        byteArray = BitConverter.GetBytes(sp.X);
                        _bwMainFile.Write(ToLocalEndian.ToInt64FromLittle(byteArray));

                        byteArray = BitConverter.GetBytes(sp.Y);
                        _bwMainFile.Write(ToLocalEndian.ToInt64FromLittle(byteArray));
                    }
                }
            }
        }