Thread: Embedding Python - Link error

  1. #1
    Supermassive black hole cboard_member's Avatar
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    Jul 2005

    Embedding Python - Link error

    I'm following The Code Project's tutorial on embedding Python and it's all going well until I start to make function visible to the interpreter. Like:

    #include <iostream>
    #include <py/python.h>
    static int g_iNumArgs = 0;
    static PyObject* emb_NumArgs(PyObject* poSelf, PyObject* poArgs)
        if (! PyArg_ParseTuple(poArgs, ":g_iNumArgs"))
            return 0;
        return Py_BuildValue("i", g_iNumArgs);
    static PyMethodDef EmbMethods[] = {
        {"NumArgs", emb_NumArgs, METH_VARARGS,
            "Return the number of arguments received by the process."},
        {0, 0, 0, 0}
    int main(int argc, char* argv[])
        g_iNumArgs = argc;
        Py_InitModule("emb", EmbMethods);
        return 0;
    I get the link error:

    PyEmbed.obj : error LNK2019: unresolved external symbol __imp__Py_InitModule4TraceRefs referenced in function _main
    I'm linking python24.lib and I've tried all the others that come with the installation but nothing is working. Can anyone help?

    EDIT: Oh... yeah I didn't have python24_d.lib (apparently it doesn't come with the installation) so I just made a copy of python24.lib and renamed it... like an idiot. I just ran a Release and it works fine.

    Off hunting for the _d version.

    EDIT2: Well that's not happening (getting hold of it) so I'll just #undef _DEBUG. I don't like it though...
    Last edited by cboard_member; 06-09-2006 at 10:45 AM.
    Good class architecture is not like a Swiss Army Knife; it should be more like a well balanced throwing knife.

    - Mike McShaffry

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