[Python-Dev] Convert Py_Buffer to Py_UNICODE (original) (raw)

Sijin Joseph sijinjoseph at gmail.com
Mon May 2 17:27:49 CEST 2011

Hi - I am working on a patch where I have an argument that can either be a unicode string or binary data, I parse the argument using the PyArg_ParseTuple method using the s* format specification and get a Py_Buffer.

I now need to convert this Py_Buffer object to a Py_Unicode and pass it into a function. What is the best way to do this? If I determine that the passed argument was binary using another flag parameter then I am passing Py_Buffer->buf as a pointer to the start of the data.

This is in winsound module, here's the relevant code snippet

sound_playsound(PyObject *s, PyObject *args) { Py_buffer *buffer; int flags; int ok; LPCWSTR pszSound;

if (PyArg_ParseTuple(args, "s*i:PlaySound", &buffer, &flags)) {
    if (flags & SND_ASYNC && flags & SND_MEMORY) {
        /* Sidestep reference counting headache; unfortunately this also
           prevent SND_LOOP from memory. */
        PyBuffer_Release(buffer);
        PyErr_SetString(PyExc_RuntimeError, "Cannot play asynchronously

from memory"); return NULL; }

    if(flags & SND_MEMORY) {
        pszSound = buffer->buf;
    }
    else {
        /* pszSound = ????; */
    }

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