[Overview][Constants][Types][Classes][Procedures and functions][Variables][Index] Reference for unit 'System' (#rtl)


Write file buffers to disk


Source position: systemh.inc line 1338

procedure Flush(

  var t: Text



Flush empties the internal buffer of an opened file F and writes the contents to disk. The file is not closed as a result of this call.


Depending on the state of the {$I} switch, a runtime error can be generated if there is an error. In the {$I-} state, use IOResult to check for errors.

See also



Close a file


Program Example26;

{ Program to demonstrate the Flush function. }

Var F : Text;

  { Assign F to standard output }
  Assign (F,'');
  Rewrite (F);
  Writeln (F,'This line is written first, but appears later !');
  { At this point the text is in the internal pascal buffer,
    and not yet written to standard output }
  Writeln ('This line appears first, but is written later !');
  { A writeln to 'output' always causes a flush - so this text is
    written to screen }
  Flush (f);
  { At this point, the text written to F is written to screen. }
  Write (F,'Finishing ');
  Close (f);  { Closing a file always causes a flush first }
  Writeln ('off.');

Documentation generated on: May 14 2021