(Under construction.)
procedure Extend (var F: any_file; [FileName: String;]
[BlockSize: Cardinal]);
Extend opens a file for writing. If the file does not
exist, it is created. If it does exist, the file pointer is
positioned after the last element.
Like Rewrite, Reset and Append do,
Reset accepts an optional second parameter for the name of
the file in the filesystem and a third parameter for the block size
of the file. The third parameter is allowed only (and by default
also required) for untyped files. For details, see Rewrite.
Extend is an ISO 10206 Extended extension. Borland Pascal
has Append instead.
The BlockSize parameter is a Borland Pascal extension.
The FileName parameter is a GNU Pascal extension.
program ExtendDemo;
var
Sample: Text;
begin
Assign (Sample, 'sample.txt');
Rewrite (Sample);
WriteLn (Sample, 'Hello, World!'); { `sample.txt' now has one line }
Close (Sample);
{ ... }
Extend (Sample);
WriteLn (Sample, 'Hello again!'); { `sample.txt' now has two lines }
Close (Sample)
end.