Reading and writing Binary Data

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.
sparklinAsked:
Who is Participating?

[Product update] Infrastructure Analysis Tool is now available with Business Accounts.Learn More

x
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

interCommented:
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

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
d003303Commented:
Hi d003303, (and sparklin ofcourse)
Did I understand the question wrong. If so, excuse me to post it as answer.
Regards,
Igor
0
interCommented:
Thanks guys.  I think that pretty much covers what I needed to confirm.
0
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Delphi

From novice to tech pro — start learning today.