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call a function whose name is stored in a stringtype TMyFuncType = function(a: inte

Discussion in 'Delphi Help&Requests' started by Lgogo, Feb 15, 2014.

  1. Lgogo
    Online

    LgogoLgogo is a Verified Member Downloader DF Payment Group

    If you just need to call one particular type of functions (say, function(integer, integer): string), it's a lot easier.

    Declare a function type, then get a function pointer and cast it like this:

    Code:
    type
      TMyFuncType = function(a: integer; b: integer): string of object;
    
      TMyClass = class
      published
        function Func1(a: integer; b: integer): string;
        function Func2(a: integer; b: integer): string;
        function Func3(a: integer; b: integer): string;
      public
        function Call(MethodName: string; a, b: integer): string;
      end;
    
    function TMyClass.Call(MethodName: string; a, b: integer): string;
    var m: TMethod;
    begin
      m.Code := Self.MethodAddress(MethodName); //find method code
      m.Data := pointer(Self); //store pointer to object instance
      Result := TMyFuncType(m)(a, b);
    end;
    
    {...}
    
    //use it like this
    var MyClass: TMyClass;
    begin
      MyClass := TMyClass.Create;
      MyClass.Call('Func1', 3, 5);
      MyClass.Call('Func2', 6, 4);
      MyClass.Destroy;
    end.
     
  2. BraveSofts
    Online

    BraveSofts Guest

    RE:

    th'x but it need if you don't mind a small example to be Understood Very well..
    by the way , a great job you do.
     

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