public List <Dictionary <string, object> > ReadDBFFile(Stream stream)
{
BinaryReader read = new BinaryReader(stream);
//Read the DBF header info
//The header is 32 bytes in length
// Is it a type of file that I can handle?
//File type:
// 0x02 FoxBASE
// 0x03 FoxBASE+/Dbase III plus, no memo
// 0x30 Visual FoxPro
// 0x31 Visual FoxPro, autoincrement enabled
// 0x32 Visual FoxPro with field type Varchar or Varbinary
// 0x43 dBASE IV SQL table files, no memo
// 0x63 dBASE IV SQL system files, no memo
// 0x83 FoxBASE+/dBASE III PLUS, with memo
// 0x8B dBASE IV with memo
// 0xCB dBASE IV SQL table files, with memo
// 0xF5 FoxPro 2.x (or earlier) with memo
// 0xE5 HiPer-Six format with SMT memo file
// 0xFB FoxBASE
byte fileType = read.ReadByte();
if (new byte[] { 0x02, 0x03, 0x30, 0x43, 0x63, 0x83, 0x8b,
0xcb, 0xf5, 0xfb }.Contains(fileType))
{
// Skip date.
read.BaseStream.Seek(3, SeekOrigin.Current);
// Read useful datas...
uint RecordCount = read.ReadUInt32();
ushort FirstRecord = read.ReadUInt16(); //or length of header
ushort RecordLength = read.ReadUInt16(); //length of each record
ushort reserved = read.ReadUInt16();
byte incompleteTransaction = read.ReadByte();
byte encryptionFlag = read.ReadByte();
uint freeRecordThread = read.ReadUInt32();
byte[] reservedForMultiUserDB = read.ReadBytes(8);
byte tableFlags = read.ReadByte();//0x01 file has a structural .cdx, 0x02 file has a Memo field, 0x04 file is a database (.dbc)
byte languageDriver = read.ReadByte();
ushort reserved2 = read.ReadUInt16();
//Read all the dbf fields info
List <DBFField> DBFFields = new List <DBFField>();
while (read.PeekChar() != 0x0D)
{
//The Field info is 32 bytes in length
DBFField field = new DBFField();
field.FieldName = Encoding.UTF8.GetString(read.ReadBytes(11), 0, 11).Replace("\0", "").ToLowerInvariant();
field.FieldType = read.ReadByte();
//Field type:
// C – Character
// Y – Currency
// N – Numeric
// F – Float
// D – Date
// T – DateTime
// B – Double
// I – Integer
// L – Logical
// M – Memo
// G – General
// C – Character (binary)
// M – Memo (binary)
// P – Picture
field.FieldDataAddress = read.ReadUInt32();//Displacement of field in record
field.FieldLengthInBytes = read.ReadByte();
field.NumberOfDecimalPlaces = read.ReadByte();
field.FieldFlags = read.ReadByte();
//0x01 System Column (not visible to user),
//0x02 Column can store null values,
//0x04 Binary column (for CHAR and MEMO only),
//0x06 (0x02+0x04) When a field is NULL and binary (Integer, Currency, and Character/Memo fields),
//0x0C Column is autoincrementing
field.NextAutoIncrementValue = read.ReadUInt32();
field.AutoIncrementStepValue = read.ReadByte();
field.ReservedBytes = read.ReadBytes(8);
DBFFields.Add(field);
}
byte headerTerminator = read.ReadByte();//Read the header record terminator
//Read all the records now
read.BaseStream.Seek(FirstRecord, SeekOrigin.Begin);
List <Dictionary <string, object> > table = new List <Dictionary <string, object> >();
while (read.PeekChar() != 0x1A)
{
byte[] recordContent = read.ReadBytes(RecordLength);
Dictionary <string, object> row = new Dictionary <string, object>();
int currentIndex = 1;
foreach (DBFField field in DBFFields)
{
string temp = Encoding.UTF8.GetString(recordContent, currentIndex, field.FieldLengthInBytes);
temp = temp.Trim();
currentIndex = currentIndex + field.FieldLengthInBytes;
row.Add(field.FieldName, temp);
}
table.Add(row);
}
return(table);
}
else
{
throw new NotSupportedException("The DBF file type is not supported.");
}
}
public void ReadAttributes( Stream stream )
{
BinaryReader read = new BinaryReader( stream );
//Read the DBF header info
//The header is 32 bytes in length
// Is it a type of file that I can handle?
//File type:
// 0x02 FoxBASE
// 0x03 FoxBASE+/Dbase III plus, no memo
// 0x30 Visual FoxPro
// 0x31 Visual FoxPro, autoincrement enabled
// 0x32 Visual FoxPro with field type Varchar or Varbinary
// 0x43 dBASE IV SQL table files, no memo
// 0x63 dBASE IV SQL system files, no memo
// 0x83 FoxBASE+/dBASE III PLUS, with memo
// 0x8B dBASE IV with memo
// 0xCB dBASE IV SQL table files, with memo
// 0xF5 FoxPro 2.x (or earlier) with memo
// 0xE5 HiPer-Six format with SMT memo file
// 0xFB FoxBASE
byte fileType = read.ReadByte();
if( new byte[] { 0x02, 0x03, 0x30, 0x43, 0x63, 0x83, 0x8b,
0xcb, 0xf5, 0xfb }.Contains( fileType ) )
{
// Skip date.
read.BaseStream.Seek( 3, SeekOrigin.Current );
// Read useful datas...
uint RecordCount = read.ReadUInt32();
ushort FirstRecord = read.ReadUInt16();//or length of header
ushort RecordLength = read.ReadUInt16();//length of each record
ushort reserved = read.ReadUInt16();
byte incompleteTransaction = read.ReadByte();
byte encryptionFlag = read.ReadByte();
uint freeRecordThread = read.ReadUInt32();
byte[] reservedForMultiUserDB = read.ReadBytes( 8 );
byte tableFlags = read.ReadByte();//0x01 file has a structural .cdx, 0x02 file has a Memo field, 0x04 file is a database (.dbc)
byte languageDriver = read.ReadByte();
ushort reserved2 = read.ReadUInt16();
if( RecordCount != records.Count )
throw new InvalidOperationException( "The number of records in the DBF files does not match the number of records in the SHP file." );
//Read all the dbf fields info
List<DBFField> DBFFields = new List<DBFField>();
while( read.PeekChar() != 0x0D )
{
//The Field info is 32 bytes in length
DBFField field = new DBFField();
field.FieldName = Encoding.UTF8.GetString( read.ReadBytes( 11 ), 0, 11 ).Replace( "\0", "" ).ToLower();
field.FieldType = read.ReadByte();
//Field type:
// C – Character
// Y – Currency
// N – Numeric
// F – Float
// D – Date
// T – DateTime
// B – Double
// I – Integer
// L – Logical
// M – Memo
// G – General
// C – Character (binary)
// M – Memo (binary)
// P – Picture
field.FieldDataAddress = read.ReadUInt32();//Displacement of field in record
field.FieldLengthInBytes = read.ReadByte();
field.NumberOfDecimalPlaces = read.ReadByte();
field.FieldFlags = read.ReadByte();
//0x01 System Column (not visible to user),
//0x02 Column can store null values,
//0x04 Binary column (for CHAR and MEMO only),
//0x06 (0x02+0x04) When a field is NULL and binary (Integer, Currency, and Character/Memo fields),
//0x0C Column is autoincrementing
field.NextAutoIncrementValue = read.ReadUInt32();
field.AutoIncrementStepValue = read.ReadByte();
field.ReservedBytes = read.ReadBytes( 8 );
DBFFields.Add( field );
}
byte headerTerminator = read.ReadByte();//Read the header record terminator
//Read all the records now
read.BaseStream.Seek( FirstRecord, SeekOrigin.Begin );
int recordIndex = 0;
while(read.PeekChar() != 0x1A)
{
byte[] recordContent = read.ReadBytes( RecordLength );
Dictionary<string, object> row = new Dictionary<string, object>();
int currentIndex = 1;
foreach( DBFField field in DBFFields )
{
string temp = Encoding.UTF8.GetString( recordContent, currentIndex, field.FieldLengthInBytes );
currentIndex = currentIndex + field.FieldLengthInBytes;
row.Add( field.FieldName, temp );
}
this.records[ recordIndex ].Attributes = row;
recordIndex++;
}
}
else
{
return;
}
}