TFileStream

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A TFileStream is a descendant of TStream that gets/stores its data from/to a file on disk.

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 entire file fnam into a string.
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
    strm.Free;
  end;
  result := txt;
end;
  • Write a string txt to the 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
    strm.Free;
  end;
end;

See also