public Task <IFeature> NextFeature()
{
if (_layer == null)
{
return(Task.FromResult <IFeature>(null));
}
OSGeo_v3.OGR.Feature ogrfeature = _layer.GetNextFeature();
if (ogrfeature == null)
{
return(Task.FromResult <IFeature>(null));
}
Feature feature = new Feature();
feature.OID = (int)ogrfeature.GetFID();
OSGeo_v3.OGR.FeatureDefn defn = ogrfeature.GetDefnRef();
int fieldCount = defn.GetFieldCount();
for (int i = 0; i < fieldCount; i++)
{
OSGeo_v3.OGR.FieldDefn fdefn = defn.GetFieldDefn(i);
FieldValue fv = new FieldValue(fdefn.GetName());
string fieldType = fdefn.GetFieldTypeName(fdefn.GetFieldType()).ToLower();
switch (fieldType)
{
case "integer":
fv.Value = ogrfeature.GetFieldAsInteger(i);
break;
case "real":
fv.Value = ogrfeature.GetFieldAsDouble(i);
break;
default:
fv.Value = ogrfeature.GetFieldAsString(i);
break;
}
feature.Fields.Add(fv);
}
if (feature.Shape == null)
{
OSGeo_v3.OGR.Geometry geom = ogrfeature.GetGeometryRef();
if (geom != null)
{
byte[] buffer = new byte[geom.WkbSize()];
geom.ExportToWkb(buffer);
feature.Shape = gView.Framework.OGC.OGC.WKBToGeometry(buffer);
}
}
return(Task.FromResult <IFeature>(feature));
}
public FeatureClassV3(Dataset dataset, string name)
{
_dataset = dataset;
_name = name;
using (var dataSource = OSGeo_v3.OGR.Ogr.Open(_dataset.ConnectionString, 0))
using (var ogrLayer = dataSource.GetLayerByName(_name))
{
OSGeo_v3.OGR.FeatureDefn defn = ogrLayer.GetLayerDefn();
_name = defn.GetName();
if (dataset.ConnectionString.ToLower().EndsWith(".dxf"))
{
try
{
System.IO.FileInfo fi = new System.IO.FileInfo(dataset.ConnectionString);
_name = fi.Name;
}
catch { }
}
_fields = new Fields();
for (int i = 0; i < defn.GetFieldCount(); i++)
{
OSGeo_v3.OGR.FieldDefn fdefn = defn.GetFieldDefn(i);
Field field = new Field(fdefn.GetName());
switch (fdefn.GetFieldTypeName(fdefn.GetFieldType()).ToLower())
{
case "integer":
if (_idFieldName == String.Empty)
{
_idFieldName = field.name;
}
field.type = FieldType.integer;
break;
case "real":
field.type = FieldType.Double;
break;
case "string":
field.type = FieldType.String;
field.size = fdefn.GetWidth();
break;
}
_fields.Add(field);
}
using (var spatialRef = defn.GetGeomFieldDefn(0)?.GetSpatialRef())
{
if (spatialRef != null)
{
string proj4;
spatialRef.ExportToProj4(out proj4);
if (!String.IsNullOrEmpty(proj4))
{
var sRef = new SpatialReference(spatialRef.GetName());
sRef.Parameters = proj4.Split(' ');
this.SpatialReference = sRef;
}
}
}
_countFeatures = ogrLayer.GetFeatureCount(1);
OSGeo_v3.OGR.Envelope env = new OSGeo_v3.OGR.Envelope();
ogrLayer.GetExtent(env, 1);
_envelope = new Envelope(env.MinX, env.MinY, env.MaxX, env.MaxY);
switch (defn.GetGeomType())
{
case OSGeo_v3.OGR.wkbGeometryType.wkbPoint:
_geomType = geometryType.Point;
break;
case OSGeo_v3.OGR.wkbGeometryType.wkbLineString:
case OSGeo_v3.OGR.wkbGeometryType.wkbMultiLineString:
_geomType = geometryType.Polyline;
break;
case OSGeo_v3.OGR.wkbGeometryType.wkbPolygon:
case OSGeo_v3.OGR.wkbGeometryType.wkbMultiPolygon:
_geomType = geometryType.Polygon;
break;
}
}
}
