//*************
//从文件中读取字段信息
static List <GISField> ReadFields(BinaryReader br, int FieldCount)
{
List <GISField> fields = new List <GISField>();
for (int fieldindex = 0; fieldindex < FieldCount; fieldindex++)
{
Type fieldtype = GISTools.IntToType(br.ReadInt32());
string fieldname = GISTools.ReadString(br);
fields.Add(new GISField(fieldtype, fieldname));
}
return(fields);
}
public static GISLayer ReadFile(string filename)
{
FileStream fsr = new FileStream(filename, FileMode.Open);
BinaryReader br = new BinaryReader(fsr);
MyFileHeader mfh = (MyFileHeader)(GISTools.FromBytes(br, typeof(MyFileHeader))); //读取文件头
SHAPETYPE ShapeType = (SHAPETYPE)Enum.Parse(typeof(SHAPETYPE), mfh.Shapetype.ToString()); //获取空间实体类型shapetype和
GISExtent Extent = new GISExtent(mfh.MinX, mfh.MaxX, mfh.MinY, mfh.MaxY); //地图范围extent
string layername = GISTools.ReadString(br); //读取图层名
List <GISField> Fields = ReadFields(br, mfh.FieldCount); //读取字段信息
GISLayer layer = new GISLayer(layername, ShapeType, Extent, Fields);
ReadFeatures(layer, br, mfh.FeatureCount);
br.Close();
fsr.Close();
return(layer);
}
//读取一个gisfeature的所有属性值，放在gisfile中 此函数需要事先知道字段结构，根据字段类型选取适当的读取函数
static GISAttribute ReadAttributes(List <GISField> fs, BinaryReader br)
{
GISAttribute attribute = new GISAttribute();
for (int i = 0; i < fs.Count; i++)
{
Type type = fs[i].datatype;
if (type.ToString() == "System.Boolean")
{
attribute.AddValue(br.ReadBoolean());
}
else if (type.ToString() == "System.Boolean")
{
attribute.AddValue(br.ReadBoolean());
}
else if (type.ToString() == "System.Byte")
{
attribute.AddValue(br.ReadByte());
}
else if (type.ToString() == "System.Char")
{
attribute.AddValue(br.ReadChar());
}
else if (type.ToString() == "System.Decimal")
{
attribute.AddValue(br.ReadDecimal());
}
else if (type.ToString() == "System.Double")
{
attribute.AddValue(br.ReadDouble());
}
else if (type.ToString() == "System.Single")
{
attribute.AddValue(br.ReadSingle());
}
else if (type.ToString() == "System.Int32")
{
attribute.AddValue(br.ReadInt32());
}
else if (type.ToString() == "System.Int64")
{
attribute.AddValue(br.ReadInt64());
}
else if (type.ToString() == "System.UInt16")
{
attribute.AddValue(br.ReadUInt16());
}
else if (type.ToString() == "System.UInt32")
{
attribute.AddValue(br.ReadUInt32());
}
else if (type.ToString() == "System.UInt64")
{
attribute.AddValue(br.ReadUInt64());
}
else if (type.ToString() == "System.Boolean")
{
attribute.AddValue(br.ReadBoolean());
}
else if (type.ToString() == "System.String")
{
attribute.AddValue(GISTools.ReadString(br));
}
}
return(attribute);
}
