public static List <DBFFieldDescriptor> GetDbfSchema(string dbfFileName, Encoding encoding)
{
Stream stream = new FileStream(dbfFileName, FileMode.Open);
BinaryReader reader = new BinaryReader(stream);
byte[] buffer = reader.ReadBytes(Marshal.SizeOf(typeof(DBFHeader)));
DBFHeader header = BinaryStream.ByteArrayToStructure <DBFHeader>(buffer);
List <DBFFieldDescriptor> columns = new List <DBFFieldDescriptor>();
if ((header.LengthOfHeader - 33) % 32 != 0)
{
throw new NotImplementedException();
}
int numberOfFields = (header.LengthOfHeader - 33) / 32;
for (int i = 0; i < numberOfFields; i++)
{
buffer = reader.ReadBytes(Marshal.SizeOf(typeof(DBFFieldDescriptor)));
columns.Add(DBFFieldDescriptor.Parse(buffer, encoding));
}
reader.Close();
stream.Close();
return(columns);
}
public static void Write(string fileName, System.Data.DataTable table, Encoding encoding)
{
Stream stream = new FileStream(fileName, FileMode.Create);
BinaryWriter writer = new BinaryWriter(stream);
List <DBFFieldDescriptor> columns = MakeDbfFields(table.Columns);
DBFHeader header = new DBFHeader(table.Rows.Count, table.Columns.Count, GetRecordLength(columns), encoding);
writer.Write(BinaryStream.StructureToByteArray(header));
foreach (var item in columns)
{
writer.Write(BinaryStream.StructureToByteArray(item));
}
//Terminator
writer.Write(byte.Parse("0D", System.Globalization.NumberStyles.HexNumber));
for (int i = 0; i < table.Rows.Count; i++)
{
// All dbf field records begin with a deleted flag field. Deleted - 0x2A (asterisk) else 0x20 (space)
writer.Write(byte.Parse("20", System.Globalization.NumberStyles.HexNumber));
for (int j = 0; j < table.Columns.Count; j++)
{
byte[] temp = new byte[columns[j].Length];
string value = table.Rows[i][j].ToString().Trim();
encoding.GetBytes(value, 0, value.Length, temp, 0);
writer.Write(temp);
}
}
//End of file
writer.Write(byte.Parse("1A", System.Globalization.NumberStyles.HexNumber));
writer.Close();
stream.Close();
}
public static void Write <T>(string fileName,
List <T> values,
List <Func <T, object> > mapping,
List <DBFFieldDescriptor> columns,
Encoding encoding)
{
int control = 0;
try
{
if (columns.Count != mapping.Count)
{
throw new NotImplementedException();
}
Stream stream = new FileStream(fileName, FileMode.Create);
BinaryWriter writer = new BinaryWriter(stream);
DBFHeader header = new DBFHeader(values.Count, mapping.Count, GetRecordLength(columns), encoding);
writer.Write(BinaryStream.StructureToByteArray(header));
foreach (var item in columns)
{
writer.Write(BinaryStream.StructureToByteArray(item));
}
//Terminator
writer.Write(byte.Parse("0D", System.Globalization.NumberStyles.HexNumber));
for (int i = 0; i < values.Count; i++)
{
control = i;
// All dbf field records begin with a deleted flag field. Deleted - 0x2A (asterisk) else 0x20 (space)
writer.Write(byte.Parse("20", System.Globalization.NumberStyles.HexNumber));
for (int j = 0; j < mapping.Count; j++)
{
byte[] temp = new byte[columns[j].Length];
object value = mapping[j](values[i]);
if (value != null)
{
encoding.GetBytes(value.ToString(), 0, value.ToString().Length, temp, 0);
}
string tt = encoding.GetString(temp);
var le = tt.Length;
writer.Write(temp);
}
}
//End of file
writer.Write(byte.Parse("1A", System.Globalization.NumberStyles.HexNumber));
writer.Close();
stream.Close();
File.WriteAllText(GetCpgFileName(fileName), encoding.BodyName);
}
catch (Exception ex)
{
string message = ex.Message;
string m2 = message + " " + control.ToString();
}
}
public static object[][] ReadToObject(string dbfFileName, string tableName)
{
Stream stream = new FileStream(dbfFileName, FileMode.Open);
BinaryReader reader = new BinaryReader(stream);
byte[] buffer = reader.ReadBytes(Marshal.SizeOf(typeof(DBFHeader)));
DBFHeader header = BinaryStream.ByteArrayToStructure <DBFHeader>(buffer);
List <DBFFieldDescriptor> columns = new List <DBFFieldDescriptor>();
if ((header.LengthOfHeader - 33) % 32 != 0)
{
throw new NotImplementedException();
}
int numberOfFields = (header.LengthOfHeader - 33) / 32;
for (int i = 0; i < numberOfFields; i++)
{
buffer = reader.ReadBytes(Marshal.SizeOf(typeof(DBFFieldDescriptor)));
columns.Add(DBFFieldDescriptor.Parse(buffer, DBFFile.fieldsEncoding));
}
//System.Data.DataTable result = MakeTableSchema(tableName, columns);
var result = new object[header.NumberOfRecords][];
((FileStream)reader.BaseStream).Seek(header.LengthOfHeader, SeekOrigin.Begin);
for (int i = 0; i < header.NumberOfRecords; i++)
{
// First we'll read the entire record into a buffer and then read each field from the buffer
// This helps account for any extra space at the end of each record and probably performs better
buffer = reader.ReadBytes(header.LengthOfEachRecord);
BinaryReader recordReader = new BinaryReader(new MemoryStream(buffer));
// All dbf field records begin with a deleted flag field. Deleted - 0x2A (asterisk) else 0x20 (space)
if (recordReader.ReadChar() == '*')
{
continue;
}
object[] values = new object[columns.Count];
for (int j = 0; j < columns.Count; j++)
{
int fieldLenth = columns[j].Length;
values[j] = MapFunction[columns[j].Type](recordReader.ReadBytes(fieldLenth));
}
recordReader.Close();
result[i] = values;
}
reader.Close();
stream.Close();
return(result);
}
