Demo/embed/demo.c

   1 /* Example of embedding Python in another program */
   2
   3 #include "Python.h"
   4
   5 static char *argv0;
   6
   7 void initxyzzy(); /* Forward */
   8
   9 main(argc, argv)
  10         int argc;
  11         char **argv;
  12 {
  13         /* Save a copy of argv0 */
  14         argv0 = argv[0];
  15
  16         /* Initialize the Python interpreter.  Required. */
  17         Py_Initialize();
  18
  19         /* Add a static module */
  20         initxyzzy();
  21
  22         /* Define sys.argv.  It is up to the application if you
  23            want this; you can also let it undefined (since the Python
  24            code is generally not a main program it has no business
  25            touching sys.argv...) */
  26         PySys_SetArgv(argc, argv);
  27
  28         /* Do some application specific code */
  29         printf("Hello, brave new world\n\n");
  30
  31         /* Execute some Python statements (in module __main__) */
  32         PyRun_SimpleString("import sys\n");
  33         PyRun_SimpleString("print sys.builtin_module_names\n");
  34         PyRun_SimpleString("print sys.modules.keys()\n");
  35         PyRun_SimpleString("print sys.argv\n");
  36
  37         /* Note that you can call any public function of the Python
  38            interpreter here, e.g. call_object(). */
  39
  40         /* Some more application specific code */
  41         printf("\nGoodbye, cruel world\n");
  42
  43         /* Exit, cleaning up the interpreter */
  44         Py_Exit(0);
  45         /*NOTREACHED*/
  46 }
  47
  48 /* This function is called by the interpreter to get its own name */
  49 char *
  50 getprogramname()
  51 {
  52         return argv0;
  53 }
  54
  55 /* A static module */
  56
  57 static PyObject *
  58 xyzzy_foo(self, args)
  59         PyObject *self; /* Not used */
  60         PyObject *args;
  61 {
  62         if (!PyArg_ParseTuple(args, ""))
  63                 return NULL;
  64         return PyInt_FromLong(42L);
  65 }
  66
  67 static PyMethodDef xyzzy_methods[] = {
  68         {"foo",         xyzzy_foo,      1},
  69         {NULL,          NULL}           /* sentinel */
  70 };
  71
  72 void
  73 initxyzzy()
  74 {
  75         PyImport_AddModule("xyzzy");
  76         Py_InitModule("xyzzy", xyzzy_methods);
  77 }