//Indexing
public static async Task CreateIndex(string shpFileName)
{
ShxReader shxFile = new ShxReader(Shapefile.GetShxFileName(shpFileName));
var shapes = await ReadAsync(shpFileName);
int numberOfRecords = shxFile.NumberOfRecords;
List <Indexing.ShpIndex> indexes = new List <Indexing.ShpIndex>(numberOfRecords);
for (int i = 0; i < numberOfRecords; i++)
{
int offset, contentLength;
shxFile.GetRecord(i, out offset, out contentLength);
if (contentLength == 2)
{
continue;
}
indexes.Add(new Indexing.ShpIndex()
{
RecordNumber = i,
MinimumBoundingBox = shapes[indexes.Count].MinimumBoundingBox
});
}
Indexing.IndexIO.Write(GetIndexFileName(shpFileName), indexes);
}
public static void Save(string shpFileName, IEnumerable <IEsriShape> shapes, bool createDbf = false, bool overwrite = false, SrsBase srs = null)
{
if (shapes.IsNullOrEmpty())
{
return;
}
var directory = System.IO.Path.GetDirectoryName(shpFileName);
if (!System.IO.Directory.Exists(directory) && !string.IsNullOrEmpty(directory))
{
System.IO.Directory.CreateDirectory(directory);
}
IEsriShapeCollection collection = new EsriShapeCollection <IEsriShape>(shapes);
EsriShapeType shapeType = shapes.First().Type;
using (System.IO.MemoryStream featureWriter = new System.IO.MemoryStream())
{
int recordNumber = 0;
foreach (IEsriShape item in shapes)
{
featureWriter.Write(ShpWriter.WriteHeaderToByte(++recordNumber, item), 0, 2 * ShapeConstants.IntegerSize);
featureWriter.Write(item.WriteContentsToByte(), 0, 2 * item.ContentLength);
}
using (System.IO.MemoryStream shpWriter = new System.IO.MemoryStream())
{
int fileLength = (int)featureWriter.Length / 2 + 50;
shpWriter.Write(ShpWriter.WriteMainHeader(collection, fileLength, shapeType), 0, 100);
shpWriter.Write(featureWriter.ToArray(), 0, (int)featureWriter.Length);
//var mode = overwrite ? System.IO.FileMode.Create : System.IO.FileMode.CreateNew;
var mode = Shapefile.GetMode(shpFileName, overwrite);
System.IO.FileStream stream = new System.IO.FileStream(shpFileName, mode);
shpWriter.WriteTo(stream);
stream.Close();
shpWriter.Close();
featureWriter.Close();
}
}
ShxWriter.Write(Shapefile.GetShxFileName(shpFileName), collection, shapeType, overwrite);
if (createDbf)
{
Dbf.DbfFile.WriteDefault(Shapefile.GetDbfFileName(shpFileName), collection.Count, overwrite);
}
//try to automatically find srs
if (srs == null)
{
var srid = shapes.First()?.Srid ?? 0;
srs = SridHelper.AsSrsBase(srid);
}
if (srs != null)
{
SaveAsPrj(shpFileName, srs, overwrite);
}
}