Demo/embed/demo.c

   1 /* Example of embedding Python in another program */
   2
   3 #include "Python.h"
   4
   5 void initxyzzy(); /* Forward */
   6
   7 main(argc, argv)
   8         int argc;
   9         char **argv;
  10 {
  11         /* Pass argv[0] to the Python interpreter */
  12         Py_SetProgramName(argv[0]);
  13
  14         /* Initialize the Python interpreter.  Required. */
  15         Py_Initialize();
  16
  17         /* Add a static module */
  18         initxyzzy();
  19
  20         /* Define sys.argv.  It is up to the application if you
  21            want this; you can also let it undefined (since the Python
  22            code is generally not a main program it has no business
  23            touching sys.argv...) */
  24         PySys_SetArgv(argc, argv);
  25
  26         /* Do some application specific code */
  27         printf("Hello, brave new world\n\n");
  28
  29         /* Execute some Python statements (in module __main__) */
  30         PyRun_SimpleString("import sys\n");
  31         PyRun_SimpleString("print sys.builtin_module_names\n");
  32         PyRun_SimpleString("print sys.modules.keys()\n");
  33         PyRun_SimpleString("print sys.executable\n");
  34         PyRun_SimpleString("print sys.argv\n");
  35
  36         /* Note that you can call any public function of the Python
  37            interpreter here, e.g. call_object(). */
  38
  39         /* Some more application specific code */
  40         printf("\nGoodbye, cruel world\n");
  41
  42         /* Exit, cleaning up the interpreter */
  43         Py_Exit(0);
  44         /*NOTREACHED*/
  45 }
  46
  47 /* A static module */
  48
  49 static PyObject *
  50 xyzzy_foo(self, args)
  51         PyObject *self; /* Not used */
  52         PyObject *args;
  53 {
  54         if (!PyArg_ParseTuple(args, ""))
  55                 return NULL;
  56         return PyInt_FromLong(42L);
  57 }
  58
  59 static PyMethodDef xyzzy_methods[] = {
  60         {"foo",         xyzzy_foo,      1},
  61         {NULL,          NULL}           /* sentinel */
  62 };
  63
  64 void
  65 initxyzzy()
  66 {
  67         PyImport_AddModule("xyzzy");
  68         Py_InitModule("xyzzy", xyzzy_methods);
  69 }