mainmodule.<functionname> dynamically?

[softtouch 9]

Lets say I have an array with the following 2 strings in it:

 

ClickElement_ByXPATH

ClickElement_ByCSSSelector

 

I have Python function with the same name, so I could call MainModule.ClickElement_ByXPATH or MainModule.ClickElement_ByCSSSelector, which works.

 

Is there any way to create the funcname in the call MainModule.<funcname> based on the strings in the stringlist?

For example, when I get the first item in the stringlist (ClickElement_ByXPATH), how could I create a call to MainModule.<here the element from the stringlist>, similar I can do with rtti and delphi functions, so it would call MainModule.ClickElement_ByXPATH? With other words, creating the call based on the text in a stringlist.

[Remy Lebeau 1400]

Are you wanting to call a Python function dynamically from Delphi code? Or call a Delphi function dynamically from Python code? Its not clear what you are looking for. Can you provide an example? 

[softtouch 9]

1 hour ago, Remy Lebeau said:

Are you wanting to call a Python function dynamically from Delphi code? Or call a Delphi function dynamically from Python code? Its not clear what you are looking for. Can you provide an example? 

I want to call python functions. Their names are in a stringlist.

 

With other words, how could I call a python function when the function name is a string?

Example: var s:='ClickElement_ByXPATH';

How can I call the corresponding python function, which has exactly that name?

 

 

[Remy Lebeau 1400]

1 hour ago, softtouch said:

I want to call python functions. Their names are in a stringlist.

How are you calling Python functions from Delphi code to begin with?

[softtouch 9]

6 minutes ago, Remy Lebeau said:

How are you calling Python functions from Delphi code to begin with?

Via MainModule.<pythonfunction name here> (TPythonModule of P4D)

 

If the python function ClickElement_ByXPATH exist, I call it like MainModule.ClickElement_ByXPATH();

Edited March 30 by softtouch

[Remy Lebeau 1400]

5 hours ago, softtouch said:

TPythonModule of P4D

THAT'S an important piece of information that was missing.

 

Python4Delphi's MainModule is a function that returns a custom Variant holding a reference to Python's __main__ object.  A custom class named TPythonVariantType derived from Delphi's TInvokeableVariantType is used to allow such Variants to access properties and methods of the Python objects they hold.

 

So, in your example, when you call MainModule.ClickElement_ByXPATH, the Delphi compiler emits code to pass the MainModule Variant to Python4Delphi's implementation of TPythonVariantType.DoProcedure() or TPythonVariantType.DoFunction() (depending on whether a return value is used or not) to invoke the "ClickElement_ByXPATH" function by name at runtime.

 

So, to do what you are asking for, you could invoke TPythonVariantType.DoProcedure() manually, eg (UNTESTED!):

uses
  ..., Variants, VarPyth;

var
  custType: TCustomVariantType;
  v: Variant;
begin
  // MainModule.ClickElement_ByXPATH();
  if FindCustomVariantType(VarPython, custType) then
  begin
    v := MainModule;
    custType.DoProcedure(TVarData(v), 'ClickElement_ByXPATH', nil);
  end;
end;

 

 

Edited March 31 by Remy Lebeau

[pyscripter 689]

@Remy Lebeau approach should work.  (not tested)

 

Alternatively you can use the more efficient:

var
  PyMainModule: PPyObject;

PyMainModule := GetPythonEngine.GetMainModule;
GetPythonEngine.PyObject_CallMethod (PyMainModule, PAnsiChar(AnsiString(method_name)), nil);

 

Edited March 31 by pyscripter

[softtouch 9]

7 hours ago, pyscripter said:

@Remy Lebeau approach should work.  (not tested)

 

Alternatively you can use the more efficient:

var
  PyMainModule: PPyObject;

PyMainModule := GetPythonEngine.GetMainModule;
GetPythonEngine.PyObject_CallMethod (PyMainModule, PAnsiChar(AnsiString(method_name)), nil);

 

Thank you, but how can I provide parameter to the call when using this approach like result:=MainModule.ClickElement_ByXPATH(param1,param2,param3...)

[pyscripter 689]

How about reading the documentation of PyObject_CallMethod or just googling for example usage?

Edited March 31 by pyscripter

[softtouch 9]

I did, but I cant get it to work unfortunately. Anyway, thanks for your help.

[pyscripter 689]

Note that if you get the PyObject corresponding to the function by using for instance

var
  PyMainModule: PPyObject;
  PyFunc: PPyObject;

PyMainModule := GetPythonEngine.GetMainModule;
PyFunc := GetPythonEngine.PyObject_GetAttrString (PyMainModule, PAnsiChar(AnsiString(method_name)));
// When you finish with PyFunc you need to decrease the refcount

 

You can then call the function in a number of different ways including the relatively high level:

 

    function   EvalFunction(pyfunc:PPyObject; const args: array of const): Variant;
 

[softtouch 9]

7 minutes ago, pyscripter said:

Note that if you get the PyObject corresponding to the function by using for instance

var
  PyMainModule: PPyObject;
  PyFunc: PPyObject;

PyMainModule := GetPythonEngine.GetMainModule;
PyFunc := GetPythonEngine.PyObject_GetAttrString (PyMainModule, PAnsiChar(AnsiString(method_name)));
// When you finish with PyFunc you need to decrease the refcount

 

You can then call the function in a number of different ways including the relatively high level:

 

    function   EvalFunction(pyfunc:PPyObject; const args: array of const): Variant;
 

Thank you! This is actually working just fine!