/// <summary>
/// Gets the header from a dbf file.
/// </summary>
/// <param name="dbfFile">The DBF file.</param>
/// <returns></returns>
public static dBaseHeader GetHeader(string dbfFile)
{
if (!File.Exists(dbfFile))
throw new FileNotFoundException(dbfFile + " not found");
dBaseHeader header = new dBaseHeader();
header.ReadHeader(new BinaryReader(new FileStream(dbfFile, FileMode.Open, FileAccess.Read, FileShare.Read)));
return header;
}
/// <summary>
/// This will return a copy of the index, but also preserve
/// a master copy in this object that is read-only.
/// </summary>
/// <param name="filename">The filename of the dbf file to index</param>
/// <returns>returns a List of long offsets. The index in the list is the row value.</returns>
public List<long> GetIndex(string filename)
{
List<long> OffsetsCopy = new List<long>();
_offsets = new List<long>();
if (filename == null)
{
throw new ArgumentNullException(filename);
}
// check for the file existing here, otherwise we will not get an error
//until we read the first record or read the header.
if (!System.IO.File.Exists(filename))
{
throw new System.IO.FileNotFoundException(String.Format("Could not find file \"{0}\"", filename));
}
_filename = filename;
_header = new dBaseHeader();
// read the header
System.IO.FileStream stream = new System.IO.FileStream(filename, System.IO.FileMode.Open, System.IO.FileAccess.Read);
System.IO.BinaryReader binaryreader = new System.IO.BinaryReader(stream);
_header.ReadHeader(binaryreader);
int iCurrentRecord = 0;
long CurrentOffset = _header.HeaderLength;
byte DeleteChar = Convert.ToByte('*');
int RowLength = _header.RecordLength;
while (iCurrentRecord < _header.NumRecords)
{
int Val = stream.ReadByte();
if (stream.ReadByte() != DeleteChar)
{
_offsets.Add(CurrentOffset);
OffsetsCopy.Add(CurrentOffset);
iCurrentRecord++;
}
stream.Seek(RowLength - 1, System.IO.SeekOrigin.Current);
CurrentOffset += RowLength;
}
binaryreader.Close();
stream.Close();
binaryreader.Close();
return OffsetsCopy;
}
/// <summary>
/// Gets the header information for the dbase file.
/// </summary>
/// <returns>DbaseFileHeader contain header and field information.</returns>
public dBaseHeader GetHeader()
{
if (_header==null)
{
FileStream stream = new FileStream(_filename, System.IO.FileMode.Open);
BinaryReader dbfStream = new BinaryReader(stream);
_header = new dBaseHeader();
// read the header
_header.ReadHeader(dbfStream);
dbfStream.Close();
stream.Close();
}
return _header;
}
