all,
In Delphi, I created a simple class called T_Test (see below).
T_Test = class(TObject)
private
F_Int : Integer;
public
constructor Create(inInt: Integer);
destructor Destroy; override;
property Int: Integer read F_Int write F_Int;
function showInt : String;
end;
constructor T_Test.Create(inInt: Integer);
begin
F_Int := inInt;
end;
destructor T_Test.Destroy;
begin
self.Free;
end;
function T_Test.showInt : String;
var outputLine : String;
begin
result := IntToStr(Int);
outputLine := result;
Form1.Memo1.Lines.Add(outputLine);
end;
Then I have a procedure in which I want to make a TList of T_Test object and call the showInt method function on them.
I tried like this :
procedure testTlist;
var
a, b: T_Test;
i : Integer;
begin
a := T_Test.Create(5);
b := T_Test.Create(10);
listTest := TList.Create;
listTest.Add(a);
listTest.Add(b);
listTest[i].showInt;
end;
But I keep getting an an that says I have to use a Record, Object or Class Type on the call of 'listTest[i].showInt'
Does anyone know how to call this method ?
Martin's answer is correct. But it's worth noting that if you might be adding different classes to your list, a more robust fragment of code would be ...
Martin's point about TObjectList is quiet correct. Another option to consider would be TList<T_Test>. David's comment about the error in your destructor is correct too.
I note that you did not initialise the value of i. So the fragment above is pretending you did. If you also wanted to check that the index variable was at a valid value, and not call ShowInt if it was invalid, then you could do something like this...
The above code fragment relies on short-circuit boolean evaluation.