/// <summary>
/// Advances the enumerator to the next element of the collection.
/// </summary>
/// <returns>
/// true if the enumerator was successfully advanced to the next element;
/// false if the enumerator has passed the end of the collection.
/// </returns>
/// <exception cref="T:System.InvalidOperationException">The collection was modified after the enumerator was created. </exception>
public bool MoveNext()
{
if (_idxBinaryReader != null)
{
if (_idxBinaryReader.BaseStream.Position >= _idxBinaryReader.BaseStream.Length)
{
return(false);
}
var offset = 2L * _idxBinaryReader.ReadInt32BE();
var contentLength = 2 * _idxBinaryReader.ReadInt32BE();
_shpBinaryReader.BaseStream.Position = offset;
}
if (_shpBinaryReader.BaseStream.Position < _shpBinaryReader.BaseStream.Length)
{
// Mark Jacquin: add a try catch when some shapefile have extra char at the end but no record
try
{
int recordNumber = _shpBinaryReader.ReadInt32BE();
int contentLength = _shpBinaryReader.ReadInt32BE();
_geometry = _handler.Read(_shpBinaryReader, contentLength, _parent._geometryFactory);
}
catch (Exception ex)
{
return(false);
}
return(true);
}
// Reached end of file, so close the reader.
//_shpBinaryReader.Close();
return(false);
}
/// <summary>
/// Read shape at a given offset.
/// </summary>
/// <param name="shapeOffset"> The offset at which the requested shape metadata begins.</param>
/// <param name="geoFactory"></param>
/// <returns></returns>
public Geometry ReadShapeAtOffset(long shapeOffset, GeometryFactory geoFactory)
{
Geometry currGeomtry = null;
ThrowIfDisposed();
if (shapeOffset < HEADER_LENGTH || shapeOffset >= ShapeReaderStream.BaseStream.Length)
{
throw new IndexOutOfRangeException("Shape offset cannot be lower than header length (100) or higher than shape file size");
}
lock (ShapeReaderStream)
{
// Skip to shape size location in file.
ShapeReaderStream.BaseStream.Seek(shapeOffset + 4, SeekOrigin.Begin);
int currShapeLengthInWords = ShapeReaderStream.ReadInt32BE();
currGeomtry = m_ShapeHandler.Read(ShapeReaderStream, currShapeLengthInWords, geoFactory);
}
return(currGeomtry);
}
/// <summary>
/// Advances the enumerator to the next element of the collection.
/// </summary>
/// <returns>
/// true if the enumerator was successfully advanced to the next element;
/// false if the enumerator has passed the end of the collection.
/// </returns>
/// <exception cref="T:System.InvalidOperationException">The collection was modified after the enumerator was created. </exception>
public bool MoveNext()
{
if (_shpBinaryReader.PeekChar() != -1)
{
// Mark Jacquin: add a try catch when some shapefile have extra char at the end but no record
try
{
int recordNumber = _shpBinaryReader.ReadInt32BE();
int contentLength = _shpBinaryReader.ReadInt32BE();
_geometry = _handler.Read(_shpBinaryReader, _parent._geometryFactory);
}
catch (Exception)
{
return(false);
}
return(true);
}
else
{
// Reached end of file, so close the reader.
//_shpBinaryReader.Close();
return(false);
}
}
/// <summary>
/// Advances the enumerator to the next element of the collection.
/// </summary>
/// <returns>
/// true if the enumerator was successfully advanced to the next element;
/// false if the enumerator has passed the end of the collection.
/// </returns>
/// <exception cref="T:System.InvalidOperationException">The collection was modified after the enumerator was created. </exception>
public bool MoveNext()
{
if (_shpBinaryReader.BaseStream.Position < _shpBinaryReader.BaseStream.Length)
{
// Mark Jacquin: add a try catch when some shapefile have extra char at the end but no record
try
{
int recordNumber = _shpBinaryReader.ReadInt32BE();
int contentLength = _shpBinaryReader.ReadInt32BE();
_geometry = _handler.Read(_shpBinaryReader, contentLength, _parent._geometryFactory);
}
catch (Exception ex)
{
// actually we should remove this crap...
Trace.WriteLine(ex.Message);
return(false);
}
return(true);
}
// Reached end of file, so close the reader.
//_shpBinaryReader.Close();
return(false);
}
/// <summary>
/// Reads a record from the specified stream.
/// </summary>
/// <param name="stream">A System.IO.Stream instance to read</param>
/// <param name="recordOffset">An offset of record</param>
/// <param name="bounds">An object representing a bounds of the reading area</param>
public ShapeFileRecord ReadRecord(Stream stream, int?recordOffset, BoundingRectangle bounds)
{
#region old
//if (recordOffset != null)
// stream.Seek(recordOffset.Value, 0);
//ShapeFileRecord record = new ShapeFileRecord();
//record.Offset = stream.Position;
//// заголовок записи
//record.RecordNumber = ShapeFile.ReadInt32_BE(stream);
//record.ContentLength = ShapeFile.ReadInt32_BE(stream);
//// тип геометрической фигуры
//record.ShapeType = ShapeFile.ReadInt32_LE(stream);
//bool wasRead = false;
//switch (record.ShapeType)
//{
// case (int)ShapeType.NullShape:
// break;
// case (int)ShapeType.Point:
// wasRead = ShapeFile.ReadPoint(stream, bounds, record);
// break;
// case (int)ShapeType.PolyLine:
// wasRead = ShapeFile.ReadPolygon(stream, bounds, record);
// break;
// case (int)ShapeType.Polygon:
// wasRead = ShapeFile.ReadPolygon(stream, bounds, record);
// break;
// case (int)ShapeType.Multipoint:
// wasRead = ShapeFile.ReadMultipoint(stream, bounds, record);
// break;
// default:
// {
// string msg = String.Format(System.Globalization.CultureInfo.InvariantCulture, "ShapeType {0} is not supported.", (int)record.ShapeType);
// throw new InvalidDataException(msg);
// }
//}
//if (wasRead)
//{
// this._records.Add(record);
// return record;
//}
//else return null;
#endregion
#region New
if (recordOffset != null)
{
stream.Seek(recordOffset.Value, 0);
}
ShapeFileRecord record = new ShapeFileRecord();
record.Offset = stream.Position;
// заголовок записи
//BigEndianBinaryReader reader = new BigEndianBinaryReader(stream);
//record.RecordNumber = reader.ReadInt32BE();// ShapeFile.ReadInt32_BE(stream);
//record.ContentLength = reader.ReadInt32BE();// ShapeFile.ReadInt32_BE(stream);
record.RecordNumber = stream.ReadInt32BE(); // ShapeFile.ReadInt32_BE(stream);
record.ContentLength = stream.ReadInt32BE(); // ShapeFile.ReadInt32_BE(stream);
// тип геометрической фигуры
record.ShapeType = stream.ReadInt32(); //.ReadInt32BE();// ShapeFile.ReadInt32_LE(stream);
ShapeHandler handler = ShapeFile.GetShapeHandler((ShapeType)record.ShapeType);
if (handler.Read(stream, bounds, record))
{
this._records.Add(record);
return(record);
}
else
{
return(null);
}
#endregion
}
