/// <summary>
/// Open a DBF from a FileStream. This can be a file or an internet connection stream. Make sure that it is positioned at start of DBF file.
/// Reading a DBF over the internet we can not determine size of the file, so we support HasMore(), ReadNext() interface.
/// RecordCount information in header can not be trusted always, since some packages store 0 there.
/// </summary>
/// <param name="ofs"></param>
public void Open(Stream ofs)
{
if (_dbfFile != null)
{
Close();
}
_dbfFile = ofs;
_dbfFileReader = null;
_dbfFileWriter = null;
if (_dbfFile.CanRead)
{
_dbfFileReader = new BinaryReader(_dbfFile, encoding);
}
if (_dbfFile.CanWrite)
{
_dbfFileWriter = new BinaryWriter(_dbfFile, encoding);
}
//reset position
_recordsReadCount = 0;
//assume header is not written
_headerWritten = false;
//read the header
if (ofs.CanRead)
{
//try to read the header...
try
{
_header.Read(_dbfFileReader);
_headerWritten = true;
}
catch (EndOfStreamException)
{
//could not read header, file is empty
_header = new DbfHeader(encoding);
_headerWritten = false;
}
}
if (_dbfFile != null)
{
_isReadOnly = !_dbfFile.CanWrite;
_isForwardOnly = !_dbfFile.CanSeek;
}
}
/// <summary>
/// Open a DBF from a FileStream. This can be a file or an internet connection stream. Make sure that it is positioned at start of DBF file.
/// Reading a DBF over the internet we can not determine size of the file, so we support HasMore(), ReadNext() interface.
/// RecordCount information in header can not be trusted always, since some packages store 0 there.
/// </summary>
/// <param name="ofs"></param>
public void Open(Stream ofs)
{
if (mDbfFile != null)
{
Close();
}
mDbfFile = ofs;
mDbfFileReader = null;
mDbfFileWriter = null;
if (mDbfFile.CanRead)
{
mDbfFileReader = new BinaryReader(mDbfFile, Encoding.ASCII);
}
if (mDbfFile.CanWrite)
{
mDbfFileWriter = new BinaryWriter(mDbfFile, Encoding.ASCII);
}
//reset position
mRecordsReadCount = 0;
//assume header is not written
mHeaderWritten = false;
//read the header
if (ofs.CanRead)
{
//try to read the header...
try
{
mHeader.Read(mDbfFileReader);
mHeaderWritten = true;
}
catch (EndOfStreamException)
{
//could not read header, file is empty
mHeader = new DbfHeader();
mHeaderWritten = false;
}
}
if (mDbfFile != null)
{
mIsReadOnly = !mDbfFile.CanWrite;
mIsForwardOnly = !mDbfFile.CanSeek;
}
}