/// <summary>
/// 读取record数据
/// 当读取时文件流位置在第一个记录处
/// </summary>
/// <param name="reader">shx文件流</param>
public void Read(BinaryReader reader)
{
//如果header为空先读取header shp和shx的文件头一样
if (mHeader == null)
{
mHeader.Read(reader);
}
if (mRecordDic != null)
{
mRecordDic.Clear();
}
else
{
mRecordDic = new Dictionary <ulong, ShxData>();
}
if (reader.BaseStream.Position == 0)
{
reader.BaseStream.Seek(100, SeekOrigin.Begin);//跳过文件头
}
while (reader.PeekChar() != -1)
{
ShxData item = new ShxData();
int Offset = reader.ReadInt32();
int ContentLength = reader.ReadInt32();
ulong uOffset = ByteTransUtil.big2little(Offset); //
ulong uContentLength = ByteTransUtil.big2little(ContentLength); //
item.Offset = (int)uOffset; //
item.ContentLength = (int)uContentLength;
mRecordDic.Add((ulong)(mRecordDic.Count + 1), item); //key值从1开始
}
}
/// <summary>
/// 读取header数据
/// 确定读取时文件流位置在开始处
/// 当读取完成文件流位置在第一个记录处
/// </summary>
/// <param name="reader"></param>
public void Read(BinaryReader reader)
{
// type of reader.
mFileCode = reader.ReadInt32();
mFileCode = (int)ByteTransUtil.big2little(mFileCode);
reader.ReadBytes(20); //预留5个inter
mFileLength = reader.ReadInt32();
mFileLength = (int)ByteTransUtil.big2little(mFileLength); //以字为单位，一字等于2字节，等于16位
mVersion = reader.ReadInt32();
int typeTemp = reader.ReadInt32();
mGeoType = (ShapeType)typeTemp;//目前考虑点 线 面三种
mXmin = reader.ReadDouble();
mYmin = reader.ReadDouble();
mXmax = reader.ReadDouble();
mYmax = reader.ReadDouble();
mZmin = reader.ReadDouble();
mZmax = reader.ReadDouble();
mMmin = reader.ReadDouble();
mMmax = reader.ReadDouble();
}
/// <summary>
/// 读取record数据
/// 当读取时文件流位置在第一个记录处
/// </summary>
/// <param name="reader"></param>
public void Read(BinaryReader reader)
{
//如果header为空先读取header
if (mHeader == null)
{
mHeader.Read(reader);
}
if (mRecordDic != null)
{
mRecordDic.Clear();
}
else
{
mRecordDic = new Dictionary <ulong, ShpData>();
}
//目前只考虑点线面三种类型
switch (mHeader.GeoType)
{
case ShapeType.Point:
while (reader.PeekChar() != -1)
{
EVPoint point = new EVPoint();
uint RecordNum = reader.ReadUInt32();
int DataLength = reader.ReadInt32();
ulong uRecordNum = ByteTransUtil.big2little((int)RecordNum); //读取第i个记录
//每一条的记录长度没有考虑RecordNum、DataLength 所以比实际长度少4字
int uDataLength = (int)ByteTransUtil.big2little(DataLength); //以字为单位，一字等于2字节，等于16位 长度不包括uRecordNum和uDataLength
int geoType = reader.ReadInt32(); //每一个对象的类型 没有用！
point.RecordNum = uRecordNum;
point.DataLength = uDataLength; //固定10字 没有考虑RecordNum、DataLength 比实际长度少4字
point.GeoType = ShapeType.Point;
point.X = reader.ReadDouble();
point.Y = reader.ReadDouble(); //
ShpData item = new ShpData();
item.GeoShape = point;
mRecordDic.Add(uRecordNum, item);
}
break;
case ShapeType.PolyLine:
while (reader.PeekChar() != -1)
{
EVPolyLine polyline = new EVPolyLine();
polyline.Parts = new ArrayList();
polyline.Points = new ArrayList();
uint RecordNum = reader.ReadUInt32(); //读取第i个记录 从1开始算
ulong uRecordNum = ByteTransUtil.big2little((int)RecordNum);
int DataLength = reader.ReadInt32(); //以字为单位，一字等于2字节，等于16位
//每一条的记录长度没有考虑RecordNum、DataLength 所以比实际长度少4字
int uDataLength = (int)ByteTransUtil.big2little(DataLength);
int geoType = reader.ReadInt32();//每一个对象的类型 没有用
polyline.RecordNum = uRecordNum;
polyline.DataLength = uDataLength; //没有考虑RecordNum、DataLength 比实际长度少4字
polyline.GeoType = ShapeType.PolyLine;
polyline.Xmin = reader.ReadDouble();
polyline.Ymin = reader.ReadDouble();
polyline.Xmax = reader.ReadDouble();
polyline.Ymax = reader.ReadDouble();
polyline.NumParts = reader.ReadInt32();
polyline.NumPoints = reader.ReadInt32();
for (int i = 0; i < polyline.NumParts; i++)
{
int parts = new int();
parts = reader.ReadInt32();
polyline.Parts.Add(parts);
}
for (int j = 0; j < polyline.NumPoints; j++)
{
EVPoint pointtemp = new EVPoint();
pointtemp.X = reader.ReadDouble();
pointtemp.Y = reader.ReadDouble();
polyline.Points.Add(pointtemp);
}
ShpData item = new ShpData();
item.GeoShape = polyline;
mRecordDic.Add(uRecordNum, item);
}
break;
case ShapeType.Polygon:
while (reader.PeekChar() != -1)
{
EVPolygon polygon = new EVPolygon();
polygon.Parts = new ArrayList();
polygon.Points = new ArrayList();
uint RecordNum = reader.ReadUInt32();
int DataLength = reader.ReadInt32();
ulong uRecordNum = ByteTransUtil.big2little((int)RecordNum); //读取第i个记录
//每一条的记录长度没有考虑RecordNum、DataLength 所以比实际长度少4字
//以字为单位，一字等于2字节，等于16位
int uDataLength = (int)ByteTransUtil.big2little(DataLength);
int geoType = reader.ReadInt32();
polygon.RecordNum = uRecordNum;
polygon.DataLength = uDataLength;
polygon.GeoType = ShapeType.Polygon;
polygon.Xmin = reader.ReadDouble();
polygon.Ymin = reader.ReadDouble();
polygon.Xmax = reader.ReadDouble();
polygon.Ymax = reader.ReadDouble();
polygon.NumParts = reader.ReadInt32();
polygon.NumPoints = reader.ReadInt32();
for (int j = 0; j < polygon.NumParts; j++)
{
int parts = new int();
parts = reader.ReadInt32();
polygon.Parts.Add(parts);
}
for (int j = 0; j < polygon.NumPoints; j++)
{
EVPoint pointtemp = new EVPoint();
pointtemp.X = reader.ReadDouble();
pointtemp.Y = reader.ReadDouble();
polygon.Points.Add(pointtemp);
}
ShpData item = new ShpData();
item.GeoShape = polygon;
mRecordDic.Add(uRecordNum, item);
}
break;
}
}
