/// <summary>
/// 根据文件流创建shapefile
/// </summary>
/// <param name="shpFileStream"></param>
/// <param name="shxFileStream"></param>
/// <param name="dbfFileStream"></param>
/// <param name="prjFileStream"></param>
/// <returns></returns>
public static FeatureSet CreateFeatureSet
(Stream shpFileStream, Stream shxFileStream,
Stream dbfFileStream, Stream prjFileStream = null)
{
using var dbfReader = new DbfReader(dbfFileStream);
var shxIndexs = new ShxReader().ReadShx(shxFileStream);
var recordNum = shxIndexs.Count;
using var shpReader = new ShpReader(shpFileStream, shxIndexs);
var fs = CreateFeatureSet(shpReader, dbfReader, recordNum);
if (prjFileStream != null)
{
string prjWkt = "";
using (var sr = new StreamReader(prjFileStream, dbfReader.Encoding))
{
prjWkt = sr.ReadToEnd();
}
var proj = Crs.CreateFromWkt(prjWkt);
fs.Crs = proj;
}
return(fs);
}
/// <summary>
/// 从shapefile生成FeatureSet
/// </summary>
/// <param name="shpFilePath"></param>
/// <returns></returns>
public static FeatureSet CreateFeatureSet(string shpFilePath)
{
if (!ShpUtil.VerificationShp(shpFilePath, out var subFiles))
{
throw new IOException("该shapefile文件不存在或者主文件缺失！");
}
//else
using var dbfReader = new DbfReader(subFiles.Item2);
var shxIndexs = new ShxReader().ReadShx(subFiles.Item1);
var recordNum = shxIndexs.Count;
using var shpReader = new ShpReader(shpFilePath, shxIndexs);
var fs = CreateFeatureSet(shpReader, dbfReader, recordNum);
if (File.Exists(subFiles.Item3))
{
string prjWkt = "";
using (var sr = new StreamReader(subFiles.Item3, Encoding.UTF8))
{
prjWkt = sr.ReadToEnd();
}
var proj = Crs.CreateFromWkt(prjWkt);
fs.Crs = proj;
}
return(fs);
}
public ShpReader(string shpFilePath)
{
string shxFilePath = shpFilePath.Substring(0, shpFilePath.Length - 3) + ".shx";
_shxRecords = new ShxReader().ReadShx(shxFilePath);
_readStream = new FileStream(shpFilePath, FileMode.Open, FileAccess.Read, FileShare.Read);
this.ShpHeader = ShpUtil.GetHeader(_readStream);
}