/// <summary>
/// Method to get the encoding from a stream provider
/// </summary>
/// <param name="provider">The stream provider</param>
/// <returns>
/// An encoding. If <paramref name="provider"/> is null,
/// the default ANSI codepage for the system is returned.
/// </returns>
internal static Encoding GetEncoding(IStreamProvider provider = null)
{
if (provider == null)
{
return(DefaultEncoding);
}
if (provider.Kind != StreamTypes.DataEncoding)
{
throw new ArgumentException("provider");
}
string cpgText;
using (var sr = new StreamReader(provider.OpenRead()))
cpgText = sr.ReadToEnd();
try
{
return(DbaseEncodingUtility.GetEncodingForCodePageName(cpgText));
}
catch
{
//return Encoding.Default;
return(DefaultEncoding);
}
}
/// <summary>
/// Write the enumeration of features to shapefile (shp, shx and dbf)
/// </summary>
/// <param name="filename">Filename to create</param>
/// <param name="features">Enumeration of features to write, features will be enumerated once</param>
/// <param name="fields">Fields that should be written, only those attributes specified here will be mapped from the feature attributetable while writing</param>
/// <param name="shapeGeometryType">Type of geometries shapefile</param>
/// <param name="dbfEncoding">Optional Encoding to be used when writing the DBF-file (default Windows-1252)</param>
public static void WriteFeatures(string filename, IEnumerable <IFeature> features, DbaseFieldDescriptor[] fields, ShapeGeometryType shapeGeometryType,
Encoding dbfEncoding = null)
{
// Set default encoding if not specified
if (dbfEncoding == null)
{
dbfEncoding = DbaseEncodingUtility.GetEncodingForCodePageIdentifier(1252);
}
// Open shapefile and dbase stream writers
using (var shpWriter = new ShapefileWriter(Path.ChangeExtension(filename, ".shp"), shapeGeometryType))
{
using (var dbfWriter = new DbaseFileWriter(Path.ChangeExtension(filename, ".dbf"), dbfEncoding))
{
var dbfHeader = new DbaseFileHeader(dbfEncoding);
foreach (var field in fields)
{
dbfHeader.AddColumn(field.Name, field.DbaseType, field.Length, field.DecimalCount);
}
dbfWriter.Write(dbfHeader);
int numFeatures = 0;
string[] fieldNames = Array.ConvertAll(fields, field => field.Name);
object[] values = new object[fieldNames.Length];
foreach (var feature in features)
{
shpWriter.Write(feature.Geometry);
for (int i = 0; i < fieldNames.Length; i++)
{
values[i] = feature.Attributes[fieldNames[i]];
}
dbfWriter.Write(values);
numFeatures++;
}
// set the number of records
dbfHeader.NumRecords = numFeatures;
// Update the header
dbfWriter.Write(dbfHeader);
// write the end of dbase file marker
dbfWriter.WriteEndOfDbf();
// close the dbase stream
dbfWriter.Close();
}
}
}
/// <summary>
/// Initializes a new instance of the <see cref="ShapefileDataWriter"/> class.
/// </summary>
/// <param name="fileName">File path without any extension</param>
/// <param name="geometryFactory"></param>
public ShapefileDataWriter(string fileName, IGeometryFactory geometryFactory)
: this(fileName, geometryFactory, DbaseEncodingUtility.GetEncodingForCodePageIdentifier(1252))
{
}
