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// Parallel port extension for Win32
// "inp" and "outp" are used to access the parallelport hardware
// needs giveio.sys driver on NT/2k/XP
//
// (C) 2002 Chris Liechti <cliechti@gmx.net>
// this is distributed under a free software license, see license.txt
#include <Python.h>
#include <windows.h>
#include <conio.h>
#define DRIVERNAME "\\\\.\\giveio"
/* module-functions */
static PyObject*
py_outp(PyObject *self, PyObject *args)
{
int port, value;
if(!PyArg_ParseTuple(args, "ii", &port, &value))
return 0;
_outp(port, value);
Py_INCREF(Py_None);
return Py_None;
}
static PyObject*
py_inp(PyObject *self, PyObject *args)
{
int port, value;
if(!PyArg_ParseTuple(args, "i", &port))
return 0;
value = _inp(port);
return Py_BuildValue("i", value);
}
static PyMethodDef pypar_methods[] = {
{"outp", py_outp, METH_VARARGS},
{"inp", py_inp, METH_VARARGS},
{0, 0}
};
/* module entry-point (module-initialization) function */
void init_pyparallel(void) {
OSVERSIONINFO vi;
/* Create the module and add the functions */
Py_InitModule("_pyparallel", pypar_methods);
//detect OS, on NT,2k,XP the driver needs to be loaded
vi.dwOSVersionInfoSize = sizeof(vi);
GetVersionEx(&vi);
if (vi.dwPlatformId == VER_PLATFORM_WIN32_NT) {
HANDLE h;
//try to open driver
h = CreateFile(DRIVERNAME, GENERIC_READ, 0, NULL,
OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
if (h == INVALID_HANDLE_VALUE) {
//if it fails again, then we have a problem... -> exception
PyErr_Format(PyExc_ImportError, "Couldn't access giveio device");
}
//close again immediately.
//the process is now tagged to have the rights it needs,
//the giveio driver remembers that
if (h != NULL) CloseHandle(h); //close the driver's file
}
}
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