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Reset

Declaration:
Procedure Reset (Var F : Any File Type[; L : Longint]);
Description:
Reset opens a file F for reading. F can be any file type. If F is a text file, or refers to standard I/O (e.g : ”) then it is opened read-only, otherwise it is opened using the mode specified in filemode.

If F is an untyped file, the record size can be specified in the optional parameter L. A default value of 128 is used.

File sharing is not taken into account when calling Reset.

Errors:
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:
Rewrite (559), Assign (455), Close (465), Append (452)

Listing: refex/ex51.pp

Program Example51;

{ Program to demonstrate the Reset function. }

Function FileExists (Name : String) : boolean;

Var F : File;

begin
  {$i-}
  Assign (F,Name);
  Reset (F);
  {$I+}
  FileExists:=(IoResult=0) and (Name<>'');
  Close (f);
end;

begin
  If FileExists (Paramstr(1)) then
    Writeln ('File found')
  else
    Writeln ('File NOT found');
end.

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