public bool Create(string filename, List <ColumnInfo> fields)
{
FileMode mode = FileMode.Create;
FileAccess access = FileAccess.ReadWrite; // exclusive
string filename_memo = string.Empty;
bool memo = false;
foreach (ColumnInfo item in fields)
{
memo = memo || (Convert.Type(item.DataType, item.Length) == DataType.Memo);
}
FileStream stream = new FileStream(filename, mode, access);
FileStream stream_memo = null;
bool ok = (stream != null);
if (ok && memo)
{
filename_memo = MemoFile.CreateFileName(filename);
stream_memo = new FileStream(filename_memo, mode, access);
ok = (stream_memo != null);
}
if (ok)
{
byte[] bytes;
ok = Attach(stream, filename, false);
if (ok)
{
HeaderLength = Const.DefaultHeaderLen + Const.FieldTerminatorLen + Const.DefaultFieldLen * fields.Count;
IsDirty = true;
stream.SetLength(HeaderLength);
StreamSeek(stream, Const.DefaultHeaderLen);
Columns = fields;
RecordLength = Const.RECORD_POS_DATA;
foreach (ColumnInfo item in fields)
{
DBF_FILEFIELD_3 field = new DBF_FILEFIELD_3();
if (item.Name.Length > Const.FieldNameLen)
{
throw new Exception("Name too long");
}
field.title = item.Name;
field.type = Const.DataTypes[(int)Convert.Type(item.DataType, item.Length)];
field.length = (byte)item.Length;
field.deccount = (byte)item.DecCount;
bytes = Utility.StructureToPtr <DBF_FILEFIELD_3>(field);
StreamWrite(stream, bytes);
RecordLength += item.Length;
}
bytes = new byte[] { (byte)Const.FieldTerminator };
StreamWrite(stream, bytes);
}
if (stream_memo != null)
{
AttachMemo(stream_memo, filename_memo);
}
}
return(ok);
}
public bool Open(string filename, FileMode mode)
{
FileAccess access = (mode == FileMode.Open)
? FileAccess.Read // non-exclusive
: FileAccess.ReadWrite; // exclusive
var stream = new FileStream(filename, mode, access);
bool ok = (stream != null);
if (ok)
{
ok = Attach(stream, filename, true);
if (ok)
{
bool memo = false;
foreach (ColumnInfo item in Columns)
{
memo = memo || (Convert.Type(item.DataType, item.Length) == DataType.Memo);
}
if (memo)
{
string filename_memo = MemoFile.CreateFileName(filename);
if (System.IO.File.Exists(filename_memo))
{
var stream_memo = new FileStream(filename_memo, mode, access);
ok = (stream_memo != null);
if (ok)
{
ok = AttachMemo(stream_memo, filename_memo);
}
}
if (!ok)
{
Close();
}
}
}
else
{
stream.Close();
}
}
return(ok);
}