Delphi: Call a function whose name is stored in a string

Question

Is it possible to call a function whose name is stored in a string in Delphi?

Answer 1

You didn't specify your Delphi version, However if you have Delphi 2010(+) you can do it using the enhanced RTTI, I'm not expert on them, but I tried this sample for you:

  TProcClass = class
    public
      procedure SayHi;
      function GetSum(X,Y:Integer): Integer;
  end;

uses
  Rtti;

{ TProcClass }

procedure TProcClass.SayHi;
begin
  ShowMessage('Hi');
end;

function TProcClass.GetSum(X, Y: Integer): Integer;
begin
  ShowMessage(IntToStr(X + Y));
end;

procedure ExecMethod(MethodName:string; const Args: array of TValue);
var
 R : TRttiContext;
 T : TRttiType;
 M : TRttiMethod;
begin
  T := R.GetType(TProcClass);
  for M in t.GetMethods do
    if (m.Parent = t) and (m.Name = MethodName)then
      M.Invoke(TProcClass.Create,Args)
end;

procedure TForm1.FormCreate(Sender: TObject);
begin
  ExecMethod('SayHi',[]);
  ExecMethod('GetSum',[10,20]);
end;

The good things, if you have procedure or function with parameters it will work without more work.