Delphi Error – E2002 File type not allowed here

Delphi Compiler Error

E2002 File type not allowed here

Reason for the Error & Solution

File types are not allowed as value parameters and as the base type of a file type itself. They are also not allowed as function return types, and you cannot assign them – those errors will however produce a different error message.

program Produce;

procedure WriteInteger(T: Text; I: Integer);
begin
  Writeln(T, I);
end;

begin
end.

In this example, the problem is that T is value parameter of type Text, which is a file type. Recall that whatever gets written to a value parameter has no effect on the caller’s copy of the variable – declaring a file as a value parameter therefore makes little sense.

program Solve;

procedure WriteInteger(var T: Text; I: Integer);
begin
  Writeln(T, I);
end;

begin
end.

Declaring the parameter as a var parameter solves the problem.