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Groups > comp.lang.python > #4029

Py_INCREF() incomprehension

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Hello Python users,

I'm working on a Python module in C - that's a cryptographic module,
which uses a 3rd-party lib from a provider (a bank).
This module will encrypt and decrypt the messages for the provider web service.

Here is a part of source:

static PyObject*
mycrypt_encrypt(PyObject *self, PyObject *args)
{
    int cRes = 0;
    int OutLen = 0;

    char *  url;
    char *  path;

    if (!PyArg_ParseTuple(args, "ss", &url, &path)) {
        return NULL;
    }

    OutLen = strlen(url)*4;
    outdata=calloc(OutLen, sizeof(char));

    if (!outdata) {
        handle_err(UER_NOMEM);
        return NULL;
    }
    cRes = ekiEncodeUrl (url, strlen(url)+1, outdata, &OutLen, 1, path);

    if (cRes == 0) {
        return Py_BuildValue("s", outdata);
    } else {
        handle_err(cRes);
        return NULL;
    }

    return Py_None;
}

where ekiEncodeUrl is in a 3rd-party library.
I should call this function from Python like this:

import mycrypt

message = "PID=IEB0001&MSGT=10&TRID=000000012345678"
crypted = mycrypt(mymessage, "/path/to/key");

Everything works fine, but sorry for the recurrent question: where
should I use the Py_INCREF()/Py_DECREF() in code above?


Thank you,

cheers:

a.

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Thread

Py_INCREF() incomprehension Ervin Hegedüs <airween@gmail.com> - 2011-04-26 11:48 +0200
  Re: Py_INCREF() incomprehension Thomas Rachel <nutznetz-0c1b6768-bfa9-48d5-a470-7603bd3aa915@spamschutz.glglgl.de> - 2011-04-26 14:23 +0200
  Re: Py_INCREF() incomprehension Thomas Rachel <nutznetz-0c1b6768-bfa9-48d5-a470-7603bd3aa915@spamschutz.glglgl.de> - 2011-04-26 14:21 +0200
    Re: Py_INCREF() incomprehension Hegedüs Ervin <airween@gmail.com> - 2011-04-26 16:03 +0200
      Re: Py_INCREF() incomprehension Thomas Rachel <nutznetz-0c1b6768-bfa9-48d5-a470-7603bd3aa915@spamschutz.glglgl.de> - 2011-04-26 18:08 +0200
        Re: Py_INCREF() incomprehension Hegedüs Ervin <airween@gmail.com> - 2011-04-26 19:28 +0200
          Re: Py_INCREF() incomprehension Thomas Rachel <nutznetz-0c1b6768-bfa9-48d5-a470-7603bd3aa915@spamschutz.glglgl.de> - 2011-04-26 19:45 +0200
            Re: Py_INCREF() incomprehension Hegedüs Ervin <airween@gmail.com> - 2011-04-26 20:44 +0200
              Re: Py_INCREF() incomprehension Thomas Rachel <nutznetz-0c1b6768-bfa9-48d5-a470-7603bd3aa915@spamschutz.glglgl.de> - 2011-04-27 11:58 +0200
                Re: Py_INCREF() incomprehension Hegedüs Ervin <airween@gmail.com> - 2011-05-01 22:00 +0200
                Re: Py_INCREF() incomprehension Gregory Ewing <greg.ewing@canterbury.ac.nz> - 2011-05-02 10:48 +1200
                Re: Py_INCREF() incomprehension Thomas Rachel <nutznetz-0c1b6768-bfa9-48d5-a470-7603bd3aa915@spamschutz.glglgl.de> - 2011-05-02 02:59 +0200
                Re: Py_INCREF() incomprehension Hegedüs, Ervin <airween@gmail.com> - 2011-05-02 08:41 +0200
                Re: Py_INCREF() incomprehension Stefan Behnel <stefan_ml@behnel.de> - 2011-05-02 09:07 +0200

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