jumpsister 你好:
(1)有關這一點，在 BCB Help 裡面都說得非常清楚，建議你仔細看看
TCustomMemoryStream::Seek
Moves the current position of the stream by Offset bytes, relative to 
the origin specified by Origin.    virtual int __fastcall Seek(int Offset, Word Origin);    Description
Use Seek to move the current position within the memory stream by the 
indicated offset. Seek allows an application to read from or write to 
a particular location within the Memory associated with the memory 
stream.    If Offset is a negative number, the seek is backward from the 
specified origin. The following table shows the different values of 
Origin and their meanings for seeking.    Value                 Meaning
----------------------------------------------------------------------
soFromBeginning   Offset is from the beginning of Memory. Seek moves to the position Offset. Offset must be >= 0.
soFromCurrent     Offset is from the current position. Seek moves to Position + Offset.
soFromEnd         Offset is from the end of Memory. Offset must be <= 0 to indicate a number of bytes before the end of the memory buffer.    Seek returns the new value of the Position property.    Note:
Seek does no error checking on the value provided for Offset. Do not 
call seek with an offset that would move the current position less 
than 0 (before the start of Memory) or greater than Size (beyond the 
end of the memory buffer).
(2)請參考以下的範例程式碼 (讀取檔案最後 5 個 byte 為例)
   >>>>>>>>>>> >
    < src="http://delphi.ktop.com.tw/loadfile.php?TOPICID=10003806&CC=223734"> -- Enjoy Researching & Developing --    發表人 - RaynorPao 於 2004/07/12  14:04:10