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Most simple technique for creating a Callback function (Pyth

kxroberto Posted: Thu Dec 21, 2006 2:46 pm

Joined: 21 Dec 2006

Posts: 8

Most simple technique for creating a Callback function (Pyth

The demos 5 ff of P4D seem to be overkill for my purpose and I don`t
want/like a visual clickering a TPythonModule Component around
somewhere on a special form but organize some callback functions
ad-hoc and easy inside a decent normal Pascal Unit.

I just want to have e.g. a Delphi Function/Method like

//Delphi module or class function:
function cbProgress(v:double;s:string):integer;
begin
...
end;

//call into Python:
dcore:=Import(`dcore`);
dcore.f( 100, CALLBACK_MAKER(cbProgress) )
dcore.f( 100, CALLBACK_MAKER2(obj.cbProgress) )
...

and in Python doing the callbacks:

#dcore.py:
def f(n, cb):
for i in range(n):
if cb( 100.0*i/n,`test`)!=0:
break
do_something(i)

Think this is a very common pattern of usage.
What is the most easy and readable technique for realizing
CALLBACK_MAKER (for common pascal function layouts) ?
Or is it unavoidable to create a TPythonModule w. AddMethod and all
the args/PPyObject fiddling things for each use case? In that case,
how can I use TPythonModule/AddMethod ad hoc/dynamically without the
visual clickering?

Robert

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