Solved

Reading and writing Binary Data

Posted on 1998-05-07
3
133 Views
Last Modified: 2010-04-06
I have a file with a 128 byte header field, followed by RFC-822 text.  How would I go about reading in the binary header data from this file so that the data can be manipulated and/or added to the top of another existing text file.
0
Comment
Question by:sparklin
  • 2
3 Comments
 
LVL 5

Accepted Solution

by:
inter earned 100 total points
ID: 1342562
Hi,
I propese the following code fragments:

READING BINARY DATA(128byte)
-------------------------------------
This code returns the first 128 bytes of a file named F in variable H:

type
 THeader = array[0..127] of byte;

function ReadHeader(F : string; var H : THeader):boolean;
var
  F : TFileStream;
begin
  F := TFileStream.Create(F, fmOpenRead);
  try
    F.Read(H, SizeOf(THeader));
    Result := true;
  finally
    F.Free;
  end;
end;

GIVEN HEADER READED BY ABOVE APPEND IT TO ANOTHER TEXT FILE

This routine adds the given header to the top of existing text file named F
and create a new file named N.

function AttachHeader(F,N : string; const H : THeader):boolean;
var
  T : TStringList;
  M : TMemoryStream;
begin
  F := TFileStream.Create(N, fmCreate or fmOpenWrite);
  M := TMemoryStream.Create;
  try
    //read text file
    M.LoadFromFile(F);
    //Write header to new file
    F.Write(H, SizeOf(THeader));
    //Append text file to the end of new file
    M.SaveToStream(F);
    Result := true;
  finally
    M.Free;
    F.Free;
  end;
end;


Regards,
Igor
0
 
LVL 4

Expert Comment

by:d003303
ID: 1342563
Hi d003303, (and sparklin ofcourse)
Did I understand the question wrong. If so, excuse me to post it as answer.
Regards,
Igor
0
 
LVL 5

Expert Comment

by:inter
ID: 1342564
Thanks guys.  I think that pretty much covers what I needed to confirm.
0

Featured Post

Free Tool: Port Scanner

Check which ports are open to the outside world. Helps make sure that your firewall rules are working as intended.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
Convert GUI app into console app for Win32 Env 5 109
select query - oracle 16 100
Delphi Yen format 3 45
firemonkey Android Listview Sort items 7 47
The uses clause is one of those things that just tends to grow and grow. Most of the time this is in the main form, as it's from this form that all others are called. If you have a big application (including many forms), the uses clause in the in…
Introduction I have seen many questions in this Delphi topic area where queries in threads are needed or suggested. I know bumped into a similar need. This article will address some of the concepts when dealing with a multithreaded delphi database…
This video shows how to use Hyena, from SystemTools Software, to bulk import 100 user accounts from an external text file. View in 1080p for best video quality.

791 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question