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

Read

Read from a text file into variable

Declaration

Source position: system.fpd line 59

procedure Read(

  var F: Text;

  Args: Arguments

);

procedure Read(

  Args: Arguments

);

Description

Read reads one or more values from a file F, and stores the result in V1, V2, etc.; If no file F is specified, then standard input is read. If F is of type Text, then the variables V1, V2 etc. must be of type Char, Integer, Real, String. If F is a typed file, then each of the variables must be of the type specified in the declaration of F. Untyped files are not allowed as an argument.

In earlier versions of FPC, it was also allowed to read Pchar null-terminated strings, but this has been removed, since there is no buffer checking possible.

Errors

If no data is available, empty values are returned (0 for ordinal values, empty strings for string values)

See also

Readln

  

Read from a text file into variable and goto next line

Blockread

  

Read data from an untyped file into memory

Write

  

Write variable to a text file or standard output

Blockwrite

  

Write data from memory to an untyped file

Example

Program Example50;

{ Program to demonstrate the Read(Ln) function. }

Var S : String;
    C : Char;
    F : File of char;

begin
  Assign (F,'ex50.pp');
  Reset (F);
  C:='A';
  Writeln ('The characters before the first space in ex50.pp are : ');
  While not Eof(f) and (C<>' ') do
    Begin
    Read (F,C);
    Write (C);
    end;
 Writeln;
 Close (F);
 Writeln ('Type some words. An empty line ends the program.');
 repeat
   Readln (S);
 until S='';
end.

Documentation generated on: Jun 23 2021