Problems returning data from embedded Python

Cromulent cromulent at justextrememetal.com
Wed Aug 13 00:48:54 CEST 2008


On 2008-08-12 05:37:53 +0100, "Gabriel Genellina" 
<gagsl-py2 at yahoo.com.ar> said:

> En Mon, 11 Aug 2008 12:58:00 -0300, Cromulent  
> <cromulent at justextrememetal.com> escribi�:
> 
>> <snip>
> 
> Uh? You have a complete API for working with list objects, the 
> functions  named PyList_*
> See http://docs.python.org/api/listObjects.html
> There is also an abstract layer that works both with lists and tuples:  
> http://docs.python.org/api/sequence.html
> If that's not what you are after, please provide more details...

Spoke too soon.

Right, I've rewritten the Python program and it returns a tuple of 
lists and one integer. Basically as you saw before, the python program 
reads a file in, splits it into elements that were separated by a comma.

The new program just puts each element into its own list. Here is a 
line from the file I am reading in:

15-Jul-08,37.70,37.70,36.43,36.88,102600

so basically I have 6 lists and one int (which is the total number of 
lines read by the program) I then return that tuple to the C program. 
After that I call the following:

error = PyArg_ParseTuple(value, "isffffi", &totalLines, &finopen, 
&finclose, &finhigh, &finlow, &finvolume);

but that will only give me the first element of the list. What I would 
like to do is return the total number of lines read separately, then 
use that to allocate a C99 style variable sized array and then loop 
through the call to PyArg_ParseTuple to populate the array. The problem 
with that is that I don't think PyArg_ParseTuple is designed in that 
way. It will put the contents of the list in the variable and not split 
it up so that I can populate an array.

Am I making any sense? Probably not, but it is hard to explain.

Thanks for any help.
-- 
"I disapprove of what you say, but I'll defend to the death your right 
to say it." - Voltaire




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