Delphi Basics : TextFile command

DelphiBasics

TextFile
Type

Declares a file type for storing lines of text

System unit

var TextFile;

Description

The TextFile type defines a file type for holding textual data.

Text files provide a simple, convenient way of storing textual data. They do provide mechanisms for reading and writing numerical data stored as text (see Write), but it is safer and wiser to use structured records when storing anything other than plain text strings.

However, text files do allow variable length records.

Related commands

Append		Open a text file to allow appending of text to the end
AssignFile		Assigns a file handle to a binary or text file
File		Defines a typed or untyped file
Reset		Open a text file for reading, or binary file for read/write
ReWrite		Open a text or binary file for write access

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Example code : Writing to and reading from a TextFile

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 World');

  // Close the file
  CloseFile(myFile);

  // Reopen the file for reading
  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