Author: Tomas Rutkauskas

I have a reference to a TMethod (with its Data and Code pointers) and would like to 
execute the associated method. Does anyone know how I can do this?

Answer:

Here is an example that executes a method by name. Note that the method to be 
called (in the example that is SomeMethod) must be declared as published, otherwise 
MethodAddress wil return nil.


1   { ... }
2   type
3     PYourMethod = ^TYourMethod;
4     TYourMethod = procedure(S: string) of object;
5   
6   procedure TMainForm.Button1Click(Sender: TObject);
7   begin
8     ExecMethodByName('SomeMethod');
9   end;
10  
11  procedure TMainForm.ExecMethodByName(AName: string);
12  var
13    PAddr: PYourMethod;
14    M: TMethod;
15  begin
16    PAddr := MethodAddress(AName);
17    if PAddr <> nil then
18    begin
19      M.Code := PAddr;
20      M.Data := Self;
21      TYourMethod(M)('hello');
22    end;
23  end;
24  
25  procedure TMainForm.SomeMethod(S: string);
26  begin
27    ShowMessage(S);
28  end;