TFileStream

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A TFileStream is a descendant of TStream that gets/stres its data from/to a file on disk. A TFileStream reads entire file data into memory and vice versa.

Constant	Decimal	Description
fmCreate	65280	Creates a new file
fmOpenRead	0	opens a file for reading
fmOpenWrite	1	opens a file for writing
fmOpenReadWrite	2	opens a file for reading and writing
fmShareDenyWrite	32	prohibit writing if file is already opened

read from file fnam.

function readstream( fnam: string ): string;
var
  strm: TFileStream;
  n: longint;
  txt: string;
begin
  txt := '';
  strm := TFileStream.Create( fnam, fmOpenRead or fmShareDenyWrite );
  try
    n := strm.Size;
    SetLength( txt, n );
    strm.Read( txt[1], n );
  finally
    FreeAndNil( strm );
  end;
  result := txt;
end;

Write txt to file fnam.

procedure writestream( fnam: string; txt: string );
var
  strm: TFileStream;
  n: longint;
begin
  strm := TFileStream.Create( fnam, fmCreate );
  n := Length( txt );
  try
    strm.Position := 0;
    strm.Write( txt[1], n );
  finally
    FreeAndNil( strm );
  end;
end;