Demo/embed/demo.c

   1 /* Example of embedding Python in another program */
   2
   3 #include "Python.h"
   4
   5 void initxyzzy(void); /* Forward */
   6
   7 main(int argc, char **argv)
   8 {
   9         /* Pass argv[0] to the Python interpreter */
  10         Py_SetProgramName(argv[0]);
  11
  12         /* Initialize the Python interpreter.  Required. */
  13         Py_Initialize();
  14
  15         /* Add a static module */
  16         initxyzzy();
  17
  18         /* Define sys.argv.  It is up to the application if you
  19            want this; you can also let it undefined (since the Python
  20            code is generally not a main program it has no business
  21            touching sys.argv...) */
  22         PySys_SetArgv(argc, argv);
  23
  24         /* Do some application specific code */
  25         printf("Hello, brave new world\n\n");
  26
  27         /* Execute some Python statements (in module __main__) */
  28         PyRun_SimpleString("import sys\n");
  29         PyRun_SimpleString("print sys.builtin_module_names\n");
  30         PyRun_SimpleString("print sys.modules.keys()\n");
  31         PyRun_SimpleString("print sys.executable\n");
  32         PyRun_SimpleString("print sys.argv\n");
  33
  34         /* Note that you can call any public function of the Python
  35            interpreter here, e.g. call_object(). */
  36
  37         /* Some more application specific code */
  38         printf("\nGoodbye, cruel world\n");
  39
  40         /* Exit, cleaning up the interpreter */
  41         Py_Exit(0);
  42         /*NOTREACHED*/
  43 }
  44
  45 /* A static module */
  46
  47 /* 'self' is not used */
  48 static PyObject *
  49 xyzzy_foo(PyObject *self, PyObject* args)
  50 {
  51         return PyInt_FromLong(42L);
  52 }
  53
  54 static PyMethodDef xyzzy_methods[] = {
  55         {"foo",         xyzzy_foo,      METH_NOARGS,
  56          "Return the meaning of everything."},
  57         {NULL,          NULL}           /* sentinel */
  58 };
  59
  60 void
  61 initxyzzy(void)
  62 {
  63         PyImport_AddModule("xyzzy");
  64         Py_InitModule("xyzzy", xyzzy_methods);
  65 }