public void WriteHeader()
{
_Stream.Seek(0, SeekOrigin.Begin);
string title = Title;
if (title.Length > Const.FileTitleLen)
{
title = title.Substring(0, Const.FileTitleLen);
}
else
{
while (title.Length < Const.FileTitleLen)
{
title += Const.FieldFillChar;
}
}
DBT_FILEHEADER header = new DBT_FILEHEADER();
header.next = (uint)Next;
header.title = File.TextEncoding.GetBytes(title);
header.flag = 0;
header.blocksize = Const.MemoBlockLen;
byte[] bytes = Utility.StructureToPtr <DBT_FILEHEADER>(header);
_Stream.Write(bytes, 0, bytes.GetLength(0));
}
public bool ReadHeader()
{
int len = Marshal.SizeOf(typeof(DBT_FILEHEADER));
byte[] bytes = new byte[len];
bool ok = (len == _Stream.Read(bytes, 0, len));
if (ok)
{
DBT_FILEHEADER header = Utility.PtrToStructure <DBT_FILEHEADER>(bytes);
Next = header.next;
}
return(ok);
}