Delphi Basics : Eof command

DelphiBasics

Eof
Function

Returns true if a file opened with Reset is at the end

System unit

function Eof(var FileHandle TextFile);

Description

The Eof function returns true if the file given by FileHandle is at the end.

The file must have been assigned, and opened with Reset.

Notes

Warning after reading the last line of a file, Eof will be true, even though data has been read successfully.

So use Eof before reading, to see if reading is required.

Related commands

BlockRead		Reads a block of data records from an untyped binary file
Eoln		Returns true if the current text file is pointing at a line end
Read		Read data from a binary or text file
ReadLn		Read a complete line of data from a text file
SeekEof		Skip to the end of the current line or file
SeekEoln		Skip to the end of the current line or file

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Example code : Reading to the end of a text file

var
  myFile : TextFile;
  text   : string;

begin
  // Try to open the Test.txt file for writing to
  AssignFile(myFile, 'Test.txt');
  ReWrite(myFile);

  // Write a couple of well known words to this file
  WriteLn(myFile, 'Hello');
  WriteLn(myFile, 'World');

  // Close the file
  CloseFile(myFile);

  // Reopen the file in read only mode
  Reset(myFile);

  // Display the file contents
  while not Eof(myFile) do
  begin
    ReadLn(myFile, text);
    ShowMessage(text);
  end;

  // Close the file for the last time
  CloseFile(myFile);
end;

Show full unit code

Hello
World