/// <summary>
/// Reads the .shp and .dbf file. Both files have to be in the same folder.
/// </summary>
/// <param name="fileName">Full path for the shapefile.</param>
public ShapeFile(string fileName)
{
fileHeader = new FileHeader();
fName = fileName;
if (!File.Exists(fileName))
{
throw new FileNotFoundException("Shapefile cannot be found. Make sure the file exists, path is correct and you have access rights to the file.", fileName);
}
try
{
var fs = new FileStream(fileName, FileMode.Open);
var fileLength = fs.Length;
data = new Byte[fileLength];
fs.Read(data, 0, (int)fileLength);
fs.Close();
}
catch (Exception) {
throw;
}
}
private FileHeader ReadFileHeader()
{
var data = this.data;
var fh = new FileHeader();
fh.FileCode = ReadIntBigEndian(data, 0);
fh.FileLength = ReadIntBigEndian(data, 24);
fh.Version = ReadIntLittleEndian(data, 28);
fh.ShapeType = ReadIntLittleEndian(data, 32);
fh.XMin = ReadDoubleLittleEndian(data, 36);
fh.YMin = ReadDoubleLittleEndian(data, 44);
fh.XMax = ReadDoubleLittleEndian(data, 52);
fh.YMax = ReadDoubleLittleEndian(data, 60);
# region optionalContent
// Unused, with value 0.0, if not Measured or Z type
fh.ZMin = ReadDoubleLittleEndian(data, 68);
fh.ZMax = ReadDoubleLittleEndian(data, 76);
fh.MMin = ReadDoubleLittleEndian(data, 84);
fh.MMax = ReadDoubleLittleEndian(data, 92);
# endregion
if (fh.FileCode != FileHeader.shapefileDefaultCode)
{
throw new Exception("Unrecognized file format.");
}
return fh;
}
public void Read()
{
fileHeader = ReadFileHeader();
// Spatial reference system parameters are stored in a file with the same name but a different (.prj) extension.
var prjFile = fName.Replace(".shp", ".prj");
prjFile = prjFile.Replace(".SHP", ".PRJ");
ReadSRSInfo(prjFile);
// Read geometry
Shapes = new List<Shape>();
ReadShapes();
// dBase file has the same name but a different (.dbf) extension.
var dbaseFile = fName.Replace(".shp", ".dbf");
dbaseFile = dbaseFile.Replace(".SHP", ".DBF");
ReadDBaseFile(dbaseFile);
if (fileHeader.ProjectionInfo != null)
{
if (fileHeader.ProjectionInfo.Name.ToLower().Contains("stereographic"))
{
if (fileHeader.ProjectionInfo.Name.ToLower().Contains("south"))
{
Projection = Projections.PolarStereo;
}
else
{
Projection = Projections.PolarStereo;
}
}
}
}
