/// <summary>
///
/// </summary>
protected void ReadHeader()
{
_header = new DbaseFileHeader();
// read the header
_header.ReadHeader(_dbfStream);
// how many records remain
_readPosition = _header.HeaderLength;
}
/// <summary>
/// Gets the header from a dbf file.
/// </summary>
/// <param name="dbfFile">The DBF file.</param>
/// <returns></returns>
public static DbaseFileHeader GetHeader(string dbfFile)
{
if (!File.Exists(dbfFile))
{
throw new FileNotFoundException(dbfFile + " not found");
}
DbaseFileHeader header = new DbaseFileHeader();
header.ReadHeader(new BinaryReader(new FileStream(dbfFile, FileMode.Open, FileAccess.Read, FileShare.Read)));
return(header);
}
/// <summary>
///
/// </summary>
/// <param name="header"></param>
public void Write(DbaseFileHeader header)
{
if (header == null)
{
throw new ArgumentNullException("header");
}
if (recordsWritten)
{
throw new InvalidOperationException("Records have already been written. Header file needs to be written first.");
}
headerWritten = true;
header.WriteHeader(_writer);
_header = header;
}
/// <summary>
/// Gets the header information for the dbase file.
/// </summary>
/// <returns>DbaseFileHeader contain header and field information.</returns>
public DbaseFileHeader GetHeader()
{
if (_header == null)
{
FileStream stream = new FileStream(_filename, System.IO.FileMode.Open);
BinaryReader dbfStream = new BinaryReader(stream);
_header = new DbaseFileHeader();
// read the header
_header.ReadHeader(dbfStream);
dbfStream.Close();
stream.Close();
}
return(_header);
}
/// <summary>
///
/// </summary>
/// <param name="filename"></param>
/// <param name="recordCount"></param>
public static void WriteDummyDbf(string filename, int recordCount)
{
DbaseFileHeader dbfHeader = new DbaseFileHeader();
dbfHeader.AddColumn("Description", 'C', 20, 0);
DbaseFileWriter dbfWriter = new DbaseFileWriter(filename);
dbfWriter.Write(dbfHeader);
for (int i = 0; i < recordCount; i++)
{
ArrayList columnValues = new ArrayList();
columnValues.Add((double)i);
dbfWriter.Write(columnValues);
}
dbfWriter.Close();
}
/// <summary>
/// Gets the stub header.
/// </summary>
/// <param name="feature">The feature.</param>
/// <param name="count">The count.</param>
/// <returns></returns>
public static DbaseFileHeader GetHeader(Feature feature, int count)
{
IAttributesTable attribs = feature.Attributes;
string[] names = attribs.GetNames();
DbaseFileHeader header = new DbaseFileHeader();
header.NumRecords = count;
foreach (string name in names)
{
Type type = attribs.GetType(name);
if (type == typeof(double) || type == typeof(float))
{
header.AddColumn(name, 'N', DoubleLength, DoubleDecimals);
}
else if (type == typeof(short) || type == typeof(ushort) ||
type == typeof(int) || type == typeof(uint) ||
type == typeof(long) || type == typeof(ulong))
{
header.AddColumn(name, 'N', IntLength, IntDecimals);
}
else if (type == typeof(string))
{
header.AddColumn(name, 'C', StringLength, StringDecimals);
}
else if (type == typeof(bool))
{
throw new NotImplementedException("Boolean values currently not supported");
}
else if (type == typeof(DateTime))
{
throw new NotImplementedException("DateTime values currently not supported");
}
else
{
throw new ArgumentException("Type " + type.Name + " not supported");
}
}
return(header);
}
/// <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 ShapefileDataReader(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 DbaseFileReader(filename + ".dbf");
_shpReader = new ShapefileReader(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 DbaseFieldDescriptor[_dbfHeader.Fields.Length + 1];
_dbaseFields[0] = DbaseFieldDescriptor.ShapeField();
for (int i = 0; i < _dbfHeader.Fields.Length; i++)
{
_dbaseFields[i + 1] = _dbfHeader.Fields[i];
}
_shpHeader = _shpReader.Header;
_dbfEnumerator = _dbfReader.GetEnumerator();
_shpEnumerator = _shpReader.GetEnumerator();
_moreRecords = true;
}
