/// <summary>
/// 将FeatureSet保存为shapefile
/// </summary>
/// <param name="iFeatureSet"></param>
/// <param name="shpFilePath"></param>
public static void SaveFeatureSet(IFeatureSet iFeatureSet,
string shpFilePath)
{
var dir = Path.GetDirectoryName(shpFilePath);
if (!Directory.Exists(dir))
{
Directory.CreateDirectory(dir ?? throw new InvalidOperationException(nameof(shpFilePath)));
}
ShpUtil.DeleteShp(shpFilePath);
var(shxFilePath, dbfFilePath, prjFilePath) = ShpUtil.GetSubFileName(shpFilePath);
using var dbfWriter = new DbfWriter(iFeatureSet.AttrTable,
dbfFilePath, DbfEncodingUtil.DefaultEncoding);
dbfWriter.Write();
var featureSet = (FeatureSet)iFeatureSet;
var header = featureSet.GetHeader();
using ShpWriter shpWriter = new ShpWriter(shpFilePath);
using ShxWriter shxWriter = new ShxWriter(shxFilePath);
shpWriter.WriterHeader(header);
shxWriter.WriterHeader(header);
int offset = 100;
foreach (var feature in featureSet.Features)
{
var contentByteLength = shpWriter.WriterRecord(feature);
shxWriter.WriterRecord(offset, contentByteLength);
offset += contentByteLength;
}
shpWriter.WriteFileLength();;
shxWriter.WriteFileLength();
if (featureSet.Crs != null)
{
using var fsStream = new FileStream(prjFilePath, FileMode.OpenOrCreate, FileAccess.Write, FileShare.Read);
using var sw = new StreamWriter(fsStream);
sw.Write(featureSet.Crs.Wkt);
}
}
public static ShapeFileBytes GetShapeFileStreams(IFeatureSet iFeatureSet)
{
using var dbfWriter = new DbfWriter(iFeatureSet.AttrTable,
"", DbfEncodingUtil.DefaultEncoding);
dbfWriter.Write();
var featureSet = (FeatureSet)iFeatureSet;
var header = featureSet.GetHeader();
using ShpWriter shpWriter = new ShpWriter();
using ShxWriter shxWriter = new ShxWriter();
shpWriter.WriterHeader(header);
shxWriter.WriterHeader(header);
int offset = 100;
foreach (var feature in featureSet.Features)
{
var contentByteLength = shpWriter.WriterRecord(feature);
shxWriter.WriterRecord(offset, contentByteLength);
offset += contentByteLength;
}
shpWriter.WriteFileLength();
shxWriter.WriteFileLength();
var fileBytes = new ShapeFileBytes
{
DbfBytes = ((MemoryStream)dbfWriter.Stream).ToArray(),
ShpBytes = ((MemoryStream)shpWriter.Stream).ToArray(),
ShxBytes = ((MemoryStream)shxWriter.Stream).ToArray()
};
if (featureSet.Crs != null)
{
var bytes = Encoding.UTF8.GetBytes(featureSet.Crs.Wkt);
fileBytes.PrjBytes = bytes;
}
return(fileBytes);
}
