private long GetHeaderSizeAndFileLength(FileStream fsMainFile, BinaryReader brMainFile, out int fileLength)
{
//FileCode
int fileCode = ToLocalEndian.ToInt32FromBig(brMainFile.ReadBytes(4));
if (fileCode != 9994)
{
throw new Exception("文件不是ESRI Shape Files文件头！");
}
//Skip 20 bytes unused (5 integer)
brMainFile.ReadBytes(20);
//File length
fileLength = ToLocalEndian.ToInt32FromBig(brMainFile.ReadBytes(4)) * 2;
if (fileLength != fsMainFile.Length)
{
throw new Exception("ESRI Shape Files文件未正确结束！");
}
//Version
int Version = ToLocalEndian.ToInt32FromLittle(brMainFile.ReadBytes(4));
//Shape Type
int ShapeType = ToLocalEndian.ToInt32FromLittle(brMainFile.ReadBytes(4));
//
Envelope evp = new Envelope();
evp.MinX = ToLocalEndian.ToDouble64FromLittle(brMainFile.ReadBytes(8));
evp.MinY = ToLocalEndian.ToDouble64FromLittle(brMainFile.ReadBytes(8));
evp.MaxX = ToLocalEndian.ToDouble64FromLittle(brMainFile.ReadBytes(8));
evp.MaxY = ToLocalEndian.ToDouble64FromLittle(brMainFile.ReadBytes(8));
//Skip minZ,maxZ,minM,maxM
brMainFile.ReadBytes(8 * 4);
return(fsMainFile.Position);
}
private void ReadHeader()
{
//FileCode
int fileCode = ToLocalEndian.ToInt32FromBig(_brMainFile.ReadBytes(4));
if (fileCode != 9994)
{
throw new Exception("文件不是ESRI Shape Files文件头！");
}
//Skip 20 bytes unused (5 integer)
_brMainFile.ReadBytes(20);
//File length
_fileLength = ToLocalEndian.ToInt32FromBig(_brMainFile.ReadBytes(4)) * 2;
if (_fileLength != _fsMainFile.Length)
{
throw new Exception("ESRI Shape Files文件未正确结束！");
}
//Version
int Version = ToLocalEndian.ToInt32FromLittle(_brMainFile.ReadBytes(4));
//Shape Type
int ShapeType = ToLocalEndian.ToInt32FromLittle(_brMainFile.ReadBytes(4));
_shapeType = (enumShapeType)ShapeType;
_envelope.MinX = ToLocalEndian.ToDouble64FromLittle(_brMainFile.ReadBytes(8));
_envelope.MinY = ToLocalEndian.ToDouble64FromLittle(_brMainFile.ReadBytes(8));
_envelope.MaxX = ToLocalEndian.ToDouble64FromLittle(_brMainFile.ReadBytes(8));
_envelope.MaxY = ToLocalEndian.ToDouble64FromLittle(_brMainFile.ReadBytes(8));
AdjustZeroWidthEnvelope(_envelope);
//Skip minZ,maxZ,minM,maxM
_brMainFile.ReadBytes(8 * 4);
_fileHeaderSize = _fsMainFile.Position;
}
private object ConstructPoint(BinaryReader br, int oid)
{
ShapePoint pt = new ShapePoint(ToLocalEndian.ToDouble64FromLittle(br.ReadBytes(8)),
ToLocalEndian.ToDouble64FromLittle(br.ReadBytes(8))
);
Feature f = new Feature(oid, pt, GetFieldNames(), GetFieldValues(oid), GetAnnotation(oid));
return(f);
}
private int GetPointCountByPolygon(FileStream fs, BinaryReader br, int oid)
{
Envelope evp = new Envelope(ToLocalEndian.ToDouble64FromLittle(br.ReadBytes(8)),
ToLocalEndian.ToDouble64FromLittle(br.ReadBytes(8)),
ToLocalEndian.ToDouble64FromLittle(br.ReadBytes(8)),
ToLocalEndian.ToDouble64FromLittle(br.ReadBytes(8)));
int nParts = ToLocalEndian.ToInt32FromLittle(br.ReadBytes(4));
int nPoints = ToLocalEndian.ToInt32FromLittle(br.ReadBytes(4));
//fs.Seek(nParts * 4, SeekOrigin.Current);
//fs.Seek(nPoints * 2 * 8, SeekOrigin.Current);
return(nPoints);
}
private object ConstructMultiPoint(BinaryReader br, int oid)
{
int pointCount = ToLocalEndian.ToInt32FromLittle(br.ReadBytes(4));
ShapePoint[] pts = new ShapePoint[pointCount];
for (int i = 0; i < pts.Length; i++)
{
pts[i] = new ShapePoint(ToLocalEndian.ToDouble64FromLittle(br.ReadBytes(8)), ToLocalEndian.ToDouble64FromLittle(br.ReadBytes(8)));
}
ShapeMultiPoint multiPoint = new ShapeMultiPoint(pts);
Feature f = new Feature(oid, multiPoint, GetFieldNames(), GetFieldValues(oid), GetAnnotation(oid));
return(f);
}
private object ConstructPolylineM(BinaryReader br, int oid)
{
Envelope evp = new Envelope(ToLocalEndian.ToDouble64FromLittle(br.ReadBytes(8)),
ToLocalEndian.ToDouble64FromLittle(br.ReadBytes(8)),
ToLocalEndian.ToDouble64FromLittle(br.ReadBytes(8)),
ToLocalEndian.ToDouble64FromLittle(br.ReadBytes(8)));
int nParts = ToLocalEndian.ToInt32FromLittle(br.ReadBytes(4));
int nPoints = ToLocalEndian.ToInt32FromLittle(br.ReadBytes(4));
int[] firstPoints = new int[nParts];
for (int i = 0; i < nParts; i++)
{
firstPoints[i] = ToLocalEndian.ToInt32FromLittle(br.ReadBytes(4));
}
ShapePoint[] pts = new ShapePoint[nPoints];
for (int i = 0; i < nPoints; i++)
{
pts[i] = new ShapePoint(ToLocalEndian.ToDouble64FromLittle(br.ReadBytes(8)),
ToLocalEndian.ToDouble64FromLittle(br.ReadBytes(8)));
}
//ShapeLineString
ShapeLineString[] Lines = new ShapeLineString[nParts];
for (int i = 0; i < nParts; i++)
{
int bIdx = firstPoints[i];
int eIdx = 0;
if (nParts == 1 || i == nParts - 1)
{
eIdx = nPoints;
}
else
{
eIdx = firstPoints[i + 1];
}
ShapePoint[] rpts = new ShapePoint[eIdx - bIdx];
for (int j = bIdx; j < eIdx; j++)
{
rpts[j - bIdx] = pts[j];
}
Lines[i] = new ShapeLineString(rpts);
}
//
br.ReadBytes(2 * 8); //M Range
br.ReadBytes(nPoints * 8); //M Array
//
ShapePolyline ply = new ShapePolyline(Lines, evp);
Feature f = new Feature(oid, ply, GetFieldNames(), GetFieldValues(oid), GetAnnotation(oid));
return(f);
}
