CODEWITHSUNDEEP
pythonwindows
Buzz
Buzz

Reputation: 1619

Import C++ dll failed in Python

Following document in "Extending and Embedding the Python Interpreter", I created a VC project, and a dll file was successfully created with name "spam_d.dll"

Main code was

static PyObject *
spam_system(PyObject *self, PyObject *args)
{
    const char *command;
    int sts;

    if (!PyArg_ParseTuple(args, "s", &command))
        return NULL;
    sts = system(command);
    return Py_BuildValue("i", sts);
}

static PyMethodDef SpamMethods[] = {
    {"system",  spam_system, METH_VARARGS, "Execute a shell command."},
    {NULL, NULL, 0, NULL}        /* Sentinel */
};

PyMODINIT_FUNC
initspam(void)
{
    (void) Py_InitModule("spam", SpamMethods);
}

Then I typed following command in python:

import spam [39003 refs] spam.system("pwd") /SVN/Python/PCbuild 0 [39005 refs]

It looks working correctly. But when I rename the dll name from spam_d.pyd to spam.pyd. Python can't find the module.

>>> import spam
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: No module named spam
[39005 refs]

From the first case, it looks python could setup relationship between "import spam" and "spam_d.pyd" correctly.

How did python know "spam" module is "spam_d.pyd", but not "spam.pyd"?

And is there any documents mention it.

Upvotes: 2

Views: 718

Answers (1)

quantum
quantum

Reputation: 3838

The python tries to link against a debug library with suffix _d.pyd, since it's a Debug build. To link aganist spam.pyd, you need a Release build.

Upvotes: 1

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