Re: python to c API, passing a tuple array

[imdognuts]

Thanks for the solution!

Farshid Lashkari wrote:
> [EMAIL PROTECTED] wrote:
> > Hi,
> > I want to pass something like this to a C function via the Python C
> > API.
> > mytuple = (("string_one", 1.2, 1.3), ("string_two", 1.4, 1.5), ..,
> > .,  )
> > This tuple is dynamic in size, it needs to be 3 X N dimensions. each
> > tuple in the
> > tuple array is of the form (string, float, float) as described above
> >
> > so from python:
> >
> > mytuple = (("string_one", 1.2, 1.3), ("string_two", 1.4, 1.5))
> > api.myCFunction(mytuple)
> >
> > The C api:
> > static PyObject *myCFunction(PyObject *self, PyObject *args)
> > {
> >
> > if (!PyArg_ParseTuple(args, "O", . ?)  {
> > printf(" error in PyArg_ParseTuple!\n");
> > return Py_None;
> > }
> >
> > Thanks.
> >
>
>
> Just loop through each item in the arguments and parse the sub-tuple.
> Here is some sample code that doesn't do any error checking:
>
> static PyObject *myCFunction(PyObject *self, PyObject *args)
> {
>  int numItems, i;
>  PyObject *tuple;
>
>  numItems = PyTuple_Size(args);
>
>  for(i = 0; i < numItems; ++i)
>  {
>  tuple = PyTuple_GetItem(args,i);
>  if(!PyArg_ParseTuple(tuple,"sff",...) {
>  //handle error
>  Py_RETURN_NONE;
>  }
>  }
> }
>
> Also, you need to INCREF Py_None before you return it. Or you can use
> the macro used in the sample code above.
> 
> -Farshid

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Freeze without a binary

[imdognuts]

I want to use freeze to create the .o's to then include in a library
that will be distributed. When I use freeze it creates a binary and a
main, and the  main calls some frozenmain func. Obviously I dont want a
main() in this code. Do I need to extract the code that was generated
by freeze in main like Py_FrozenMain() and call this from somewhere
else? This  was created in the main() function:

extern int Py_FrozenMain(int, char **);

PyImport_FrozenModules = _PyImport_FrozenModules;
return Py_FrozenMain(argc, argv);


In my code i have C funcs that call py file functions which call C
funcs. I dont want to ship the py files, but include it in a library
with the other .o's
Thanks.

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linking with math.so

[imdognuts]

hi,
My application that contains the .o's that were generated from using
"freeze" needs to import math. The point of using freeze was to make a
static application that can be shipped as a single entity (it contains
the dot o's from libpython2.4.a), vs having to worry about  external
python dependencies.

"importing math" as far as I can tell right now,  invokes a shared
library (math.so).  Now I have a shared library dependency that I dont
want. Is there a way to get the math  functionality from a  dot a or a
dot o, so I dont have to make my app dependent on a shared library?
cos, sin, and pi which is what I need do not live in the libpython2.4.a
  - I did an nm on it I'm on linux.
thanks,
Nancy

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python to c API, passing a tuple array

[imdognuts]

Hi,
I want to pass something like this to a C function via the Python C
API.
mytuple = (("string_one", 1.2, 1.3), ("string_two", 1.4, 1.5), ..,
.,  )
This tuple is dynamic in size, it needs to be 3 X N dimensions. each
tuple in the
tuple array is of the form (string, float, float) as described above

so from python:

mytuple = (("string_one", 1.2, 1.3), ("string_two", 1.4, 1.5))
api.myCFunction(mytuple)

The C api:
static PyObject *myCFunction(PyObject *self, PyObject *args)
{

if (!PyArg_ParseTuple(args, "O", . ?)  {
printf(" error in PyArg_ParseTuple!\n");
return Py_None;
}

Thanks.

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