Hello,

I need to call a method dynamically by its name over string and pass some parameters to it. OK, I don't know if it is possibly in the current version of the compiler, but I'm trying to do something like this:

TMethodInvoker.Invoke(VMyObj, ['Param 1', 'Param 2', 1, True]);

I already get some paramerter informations using this code[1], that prints all parameters and its types using RTTI.

So I have a question: how can I get the method typedata looking for it in the VMT? Please see this:

  WriteLn(HexStr(@TMyObject.Test));
  WriteLn(HexStr(TMyObject.MethodAddress('Test')));

Prints the same address. But:

  TI := TypeInfo(@TMyObject.Test);
  WriteLn(HexStr(TI));
  TI := TypeInfo(TMyObject.MethodAddress('Test'));
  WriteLn(HexStr(TI));

Prints different results.

How System.TypeInfo retrieve the typeinfo from my @TMyObject.Test address? It is done by the method address so?

I took a look at the TRTTIWriter class and also in the VMT, but I don't know how the compiler handles this informations internally, so sorry it this question sounds nonsense. =P

[1] - http://pastebin.com/bPascrwe

silvioprog wrote

I need to call a method dynamically by its name over string and pass some parameters to it.

You mean like what FPCUnit, DUnit or FPTest unit testing frameworks do? If so, just take a look at any of them to see how they call the test methods.

Regards,
- Graeme -

You cannot get typeinfo like that for methods.
You need to call GetPropInfo() from the typeinfo unit for published properties/methods.

How System.TypeInfo retrieve the typeinfo from my @TMyObject.Test address? It is done by the method address so?

No.

I took a look at the TRTTIWriter class and also in the VMT, but I don't know how the compiler handles this informations internally, so sorry it this question sounds nonsense. =P

You can check the reader class in classes unit.

Michael.

On Fri, Jul 17, 2015 at 11:30 AM, Graeme Geldenhuys <

I know how FPCUnit does, but AFAIK it don't pass parameters for the triggered methods. =/

About DUnit, instead of take a loot at its code, I just use the System.Rtti.Invoke() feature.

On Fri, Jul 17, 2015 at 11:33 AM, Michael Van Canneyt <

=/

Yes, I'm just trying to avoiding an additional declaration of my procs, calling my methods using something like "published MyMethod(AParams: array of ...)" instead of calling events like "type TMyProc = procedure(AParams: array of ...) of object ...... published OnMyProc: TMyProc" etc.

=(

I took a look at the TRTTIWriter class and also in the VMT, but I don't

I'll do it again, thank you. =)