public XLayer ReadFile(string filename)
{
FileStream fsr = new FileStream(filename, FileMode.Open);
BinaryReader br = new BinaryReader(fsr);
//读文件头
MyFileHeader mfh = (MyFileHeader)XTools.FromBytes(br, typeof(MyFileHeader));
//读图层名称
string name = XTools.ReadString(br);
//读属性字段结构
List <XField> fields = ReadFields(mfh.FieldCount, br);
//定义图层
SHAPETYPE ShapeType =
(SHAPETYPE)Enum.Parse(typeof(SHAPETYPE),
mfh.ShapeType.ToString());
XExtent extent = new XExtent(
new XVertex(mfh.MinX, mfh.MinY),
new XVertex(mfh.MaxX, mfh.MaxY));
XLayer layer = new XLayer(name, ShapeType, extent, fields);
//读空间对象类型
for (int i = 0; i < mfh.FeatureCount; i++)
{
XSpatial spatial = ReadSpatial(ShapeType, br);
XAttribute attribute = ReadAttribute(br, fields);
layer.AddFeature(new XFeature(spatial, attribute));
}
//关闭文件并返回结果
br.Close();
fsr.Close();
return(layer);
}
public XLayer ReadShapefile(string shpfilename)
{
//打开文件和读取工具
FileStream fsr = new FileStream(shpfilename, FileMode.Open);
BinaryReader br = new BinaryReader(fsr);
//读取文件头
ShapefileHeader sfh = (ShapefileHeader)
XTools.FromBytes(br, typeof(ShapefileHeader));
//获得空间对象类型
SHAPETYPE ShapeType = (SHAPETYPE)Enum.Parse(typeof(SHAPETYPE), sfh.ShapeType.ToString());
//获得空间范围
XExtent extent = new XExtent(new XVertex(sfh.Xmin, sfh.Ymin),
new XVertex(sfh.Xmax, sfh.Ymax));
//读dbf
string dbfFileName = shpfilename.Replace(".shp", ".dbf");
List <XField> fields = new List <XField>();
List <XAttribute> attributes = new List <XAttribute>();
ReadDBFFile(dbfFileName, fields, attributes);
//构建图层
XLayer layer = new XLayer(shpfilename, ShapeType, extent, fields);
int index = 0;
while (br.PeekChar() != -1)
{
//读记录头
RecordHeader rh = (RecordHeader)
XTools.FromBytes(br, typeof(RecordHeader));
int RecordLength = FromBigToLittle(rh.RecordLength) * 2 - 4;
byte[] RecordContent = br.ReadBytes(RecordLength);
//开始读实际的空间数据
if (ShapeType == SHAPETYPE.point)
{
XPointSpatial point = ReadPoint(RecordContent);
layer.AddFeature(new XFeature(point, attributes[index]));
}
else if (ShapeType == SHAPETYPE.line)
{
List <XLineSpatial> lines = ReadLines(RecordContent);
foreach (XLineSpatial line in lines)
{
layer.AddFeature(new XFeature(line, new XAttribute(attributes[index])));
}
}
else if (ShapeType == SHAPETYPE.polygon)
{
List <XPolygonSpatial> polygons = ReadPolygons(RecordContent);
foreach (XPolygonSpatial polygon in polygons)
{
layer.AddFeature(new XFeature(polygon, new XAttribute(attributes[index])));
}
}
index++;
}
//关闭读取工具和文件
br.Close();
fsr.Close();
return(layer);
}
public XField(BinaryReader br)
{
//获得DBF字段
dbfField = (DBFField)XTools.FromBytes(br, typeof(DBFField));
//字段名
byte[] bs = new byte[] { dbfField.b1, dbfField.b2, dbfField.b3, dbfField.b4, dbfField.b5,
dbfField.b6, dbfField.b7, dbfField.b8, dbfField.b9, dbfField.b10, dbfField.b11 };
name = XTools.BytesToString(bs).Trim();
//字段类型
switch (dbfField.FieldType)
{
case 'C': //字符型 允许输入各种字符
datatype = Type.GetType("System.String");
break;
case 'D': //日期型 用于区分年、月、日的数字和一个字符，按照YYYYMMDD格式。
datatype = Type.GetType("System.String");
break;
case 'N': //数值型
if (dbfField.NumberOfDecimalPlaces == 0)
{
datatype = Type.GetType("System.Int32");
}
else
{
datatype = Type.GetType("System.Double");
}
break;
case 'F':
datatype = Type.GetType("System.Double");
break;
case 'B': //二进制 允许输入各种字符
datatype = Type.GetType("System.String");
break;
case 'G': //General or OLE
datatype = Type.GetType("System.String");
break;
case 'L': //逻辑型，表示没有初始化
datatype = Type.GetType("System.String");
break;
case 'M': //Memo
datatype = Type.GetType("System.String");
break;
default:
break;
}
}
private static void ReadDBFFile(string dbffilename,
List <XField> fields, List <XAttribute> attributes)
{
FileStream fsr = new FileStream(dbffilename, FileMode.Open);
BinaryReader br = new BinaryReader(fsr);
DBFHeader dh = (DBFHeader)XTools.FromBytes(br, typeof(DBFHeader));
int FieldCount = (dh.HeaderLength - 33) / 32;
//读字段结构
fields.Clear();
for (int i = 0; i < FieldCount; i++)
{
fields.Add(new XField(br));
}
byte END = br.ReadByte(); //1个字节作为记录项终止标识。
//读具体数值
attributes.Clear();
for (int i = 0; i < dh.RecordCount; i++)
{
XAttribute attribute = new XAttribute();
char tempchar = (char)br.ReadByte(); //每个记录的开始都有一个起始字节
for (int j = 0; j < FieldCount; j++)
{
attribute.AddValue(fields[j].DBFValueToObject(br));
}
attributes.Add(attribute);
}
br.Close();
fsr.Close();
}
