/// <summary>
/// Initializes a new instance of the ShapefileEnumerator class.
/// </summary>
/// <param name="shapefile"></param>
public ShapefileEnumerator(ShapeReader shapefile)
{
_parent = shapefile;
// create a file stream for each enumerator that is given out. This allows the same file
// to have one or more enumerator. If we used the parents stream - than only one IEnumerator
// could be given out.
FileStream stream = new FileStream(_parent._filename, System.IO.FileMode.Open, FileAccess.Read, FileShare.Read);
_shpBinaryReader = new BigEndianBinaryReader(stream);
// skip header - since parent has already read this.
_shpBinaryReader.ReadBytes(100);
ShapeGeometryTypes type = _parent._mainHeader.ShapeType;
_handler = Shapefile.GetShapeHandler(type);
if (_handler == null)
throw new NotSupportedException("Unsuported shape type:" + type);
}
/// <summary>
/// Reads all the information from the specified file. This also sends status messages through progressHandler.
/// </summary>
public void Open(IProgressHandler progressHandler)
{
IFeature currentFeature;
string dbfFile = Path.ChangeExtension(Filename, ".dbf");
FileStream myStream = new FileStream(dbfFile, FileMode.Open, FileAccess.Read, FileShare.Read);
BinaryReader myReader = new BinaryReader(myStream);
ReadTableHeader(myReader); // based on the header, set up the fields information etc.
ProgressMeter pm = new ProgressMeter(progressHandler, "Opening " + Path.GetFileName(Filename), _numRecords);
ShapeReader myShapeReader = new ShapeReader(Filename);
IEnumerator en = myShapeReader.GetEnumerator();
en.MoveNext();
// Reading the Table elements as well as the shapes in a single progress loop.
for (int row = 0; row < _numRecords; row++)
{
// --------- DATABASE --------- CurrentFeature = ReadTableRow(myReader);
// rem this line if the DATABASE is turned back on
currentFeature = new Feature();
currentFeature.BasicGeometry = (IBasicGeometry)en.Current;
en.MoveNext();
Features.Add(currentFeature);
// --------- DATABASE --------- _Table.Rows.Add(CurrentFeature.DataRow);
// If a progress message needs to be updated, this will handle that.
pm.CurrentValue = row;
}
Envelope = null; // invalidate the envelope so that it will be re-calculated from all the points
pm.Reset(); // Shows the basic "Ready." message indicating that we are done with this step.
}
/// <summary>
/// Opens a shapefile. This obtains an inram copy of the vector geometries, but
/// uses a database style link to the dbf fields so that it will obtain specific
/// field values upon request. Once a local copy exists, it will be stored in
/// the Layers.
/// </summary>
/// <param name="FileOrConnection"></param>
public void Open(string FileOrConnection)
{
_filenameOrConnection = FileOrConnection;
ShapeReader sfReader = new ShapeReader(FileOrConnection);
IEnumerator Shape = sfReader.GetEnumerator();
// FeatureSet myShapefileLayer = new FeatureSet(this);
//IFeature CurrentFeature;
while (Shape.MoveNext())
{
// TO DO
}
}
/// <summary>
/// Initializes a new instance of the ShapefileDataReader class.
/// </summary>
/// <param name="filename">The shapefile to read (minus the .shp extension)</param>
///<param name="geometryFactory">The GeometryFactory to use.</param>
public ShapefileReader(string filename, GeometryFactory geometryFactory)
{
if (filename == null)
throw new ArgumentNullException("filename");
if (geometryFactory == null)
throw new ArgumentNullException("geometryFactory");
_geometryFactory = geometryFactory;
_open = true;
if (filename.ToLower().EndsWith(".shp"))
filename = filename.ToLower().Replace(".shp",String.Empty);
_dbfReader = new dBaseReader(filename + ".dbf");
_shpReader = new ShapeReader(filename + ".shp", geometryFactory);
_dbfHeader = _dbfReader.GetHeader();
_recordCount = _dbfHeader.NumRecords;
// copy dbase fields to our own array. Insert into the first position, the shape column
_dbaseFields = new FieldDescriptor[_dbfHeader.Fields.Length + 1];
_dbaseFields[0] = FieldDescriptor.ShapeField();
for(int i=0; i < _dbfHeader.Fields.Length; i++)
_dbaseFields[i+1] = _dbfHeader.Fields[i];
_ShapeHeader = _shpReader.Header;
_dbfEnumerator = _dbfReader.GetEnumerator();
_shpEnumerator = _shpReader.GetEnumerator();
_moreRecords = true;
}
