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| 1 | + |
| 2 | +/* Use this file as a template to start implementing a module that |
| 3 | + also declares object types. All occurrences of 'Xxo' should be changed |
| 4 | + to something reasonable for your objects. After that, all other |
| 5 | + occurrences of 'xx' should be changed to something reasonable for your |
| 6 | + module. If your module is named foo your sourcefile should be named |
| 7 | + foomodule.c. |
| 8 | + |
| 9 | + You will probably want to delete all references to 'x_attr' and add |
| 10 | + your own types of attributes instead. Maybe you want to name your |
| 11 | + local variables other than 'self'. If your object type is needed in |
| 12 | + other files, you'll have to create a file "foobarobject.h"; see |
| 13 | + intobject.h for an example. */ |
| 14 | + |
| 15 | +/* Xxo objects */ |
| 16 | + |
| 17 | +#include "Python.h" |
| 18 | + |
| 19 | +static PyObject *ErrorObject; |
| 20 | + |
| 21 | +typedef struct { |
| 22 | + PyObject_HEAD |
| 23 | + PyObject *x_attr; /* Attributes dictionary */ |
| 24 | +} XxoObject; |
| 25 | + |
| 26 | +staticforward PyTypeObject Xxo_Type; |
| 27 | + |
| 28 | +#define XxoObject_Check(v) ((v)->ob_type == &Xxo_Type) |
| 29 | + |
| 30 | +static XxoObject * |
| 31 | +newXxoObject(PyObject *arg) |
| 32 | +{ |
| 33 | + XxoObject *self; |
| 34 | + self = PyObject_New(XxoObject, &Xxo_Type); |
| 35 | + if (self == NULL) |
| 36 | + return NULL; |
| 37 | + self->x_attr = NULL; |
| 38 | + return self; |
| 39 | +} |
| 40 | + |
| 41 | +/* Xxo methods */ |
| 42 | + |
| 43 | +static void |
| 44 | +Xxo_dealloc(XxoObject *self) |
| 45 | +{ |
| 46 | + Py_XDECREF(self->x_attr); |
| 47 | + PyObject_Del(self); |
| 48 | +} |
| 49 | + |
| 50 | +static PyObject * |
| 51 | +Xxo_demo(XxoObject *self, PyObject *args) |
| 52 | +{ |
| 53 | + if (!PyArg_ParseTuple(args, ":demo")) |
| 54 | + return NULL; |
| 55 | + Py_INCREF(Py_None); |
| 56 | + return Py_None; |
| 57 | +} |
| 58 | + |
| 59 | +static PyMethodDef Xxo_methods[] = { |
| 60 | + {"demo", (PyCFunction)Xxo_demo, METH_VARARGS}, |
| 61 | + {NULL, NULL} /* sentinel */ |
| 62 | +}; |
| 63 | + |
| 64 | +static PyObject * |
| 65 | +Xxo_getattr(XxoObject *self, char *name) |
| 66 | +{ |
| 67 | + if (self->x_attr != NULL) { |
| 68 | + PyObject *v = PyDict_GetItemString(self->x_attr, name); |
| 69 | + if (v != NULL) { |
| 70 | + Py_INCREF(v); |
| 71 | + return v; |
| 72 | + } |
| 73 | + } |
| 74 | + return Py_FindMethod(Xxo_methods, (PyObject *)self, name); |
| 75 | +} |
| 76 | + |
| 77 | +static int |
| 78 | +Xxo_setattr(XxoObject *self, char *name, PyObject *v) |
| 79 | +{ |
| 80 | + if (self->x_attr == NULL) { |
| 81 | + self->x_attr = PyDict_New(); |
| 82 | + if (self->x_attr == NULL) |
| 83 | + return -1; |
| 84 | + } |
| 85 | + if (v == NULL) { |
| 86 | + int rv = PyDict_DelItemString(self->x_attr, name); |
| 87 | + if (rv < 0) |
| 88 | + PyErr_SetString(PyExc_AttributeError, |
| 89 | + "delete non-existing Xxo attribute"); |
| 90 | + return rv; |
| 91 | + } |
| 92 | + else |
| 93 | + return PyDict_SetItemString(self->x_attr, name, v); |
| 94 | +} |
| 95 | + |
| 96 | +statichere PyTypeObject Xxo_Type = { |
| 97 | + /* The ob_type field must be initialized in the module init function |
| 98 | + * to be portable to Windows without using C++. */ |
| 99 | + PyObject_HEAD_INIT(NULL) |
| 100 | + 0, /*ob_size*/ |
| 101 | + "Xxo", /*tp_name*/ |
| 102 | + sizeof(XxoObject), /*tp_basicsize*/ |
| 103 | + 0, /*tp_itemsize*/ |
| 104 | + /* methods */ |
| 105 | + (destructor)Xxo_dealloc, /*tp_dealloc*/ |
| 106 | + 0, /*tp_print*/ |
| 107 | + (getattrfunc)Xxo_getattr, /*tp_getattr*/ |
| 108 | + (setattrfunc)Xxo_setattr, /*tp_setattr*/ |
| 109 | + 0, /*tp_compare*/ |
| 110 | + 0, /*tp_repr*/ |
| 111 | + 0, /*tp_as_number*/ |
| 112 | + 0, /*tp_as_sequence*/ |
| 113 | + 0, /*tp_as_mapping*/ |
| 114 | + 0, /*tp_hash*/ |
| 115 | +}; |
| 116 | +/* --------------------------------------------------------------------- */ |
| 117 | + |
| 118 | +/* Function of two integers returning integer */ |
| 119 | + |
| 120 | +static PyObject * |
| 121 | +xx_foo(PyObject *self, PyObject *args) |
| 122 | +{ |
| 123 | + long i, j; |
| 124 | + long res; |
| 125 | + if (!PyArg_ParseTuple(args, "ll:foo", &i, &j)) |
| 126 | + return NULL; |
| 127 | + res = i+j; /* XXX Do something here */ |
| 128 | + return PyInt_FromLong(res); |
| 129 | +} |
| 130 | + |
| 131 | + |
| 132 | +/* Function of no arguments returning new Xxo object */ |
| 133 | + |
| 134 | +static PyObject * |
| 135 | +xx_new(PyObject *self, PyObject *args) |
| 136 | +{ |
| 137 | + XxoObject *rv; |
| 138 | + |
| 139 | + if (!PyArg_ParseTuple(args, ":new")) |
| 140 | + return NULL; |
| 141 | + rv = newXxoObject(args); |
| 142 | + if ( rv == NULL ) |
| 143 | + return NULL; |
| 144 | + return (PyObject *)rv; |
| 145 | +} |
| 146 | + |
| 147 | +/* Example with subtle bug from extensions manual ("Thin Ice"). */ |
| 148 | + |
| 149 | +static PyObject * |
| 150 | +xx_bug(PyObject *self, PyObject *args) |
| 151 | +{ |
| 152 | + PyObject *list, *item; |
| 153 | + |
| 154 | + if (!PyArg_ParseTuple(args, "O:bug", &list)) |
| 155 | + return NULL; |
| 156 | + |
| 157 | + item = PyList_GetItem(list, 0); |
| 158 | + /* Py_INCREF(item); */ |
| 159 | + PyList_SetItem(list, 1, PyInt_FromLong(0L)); |
| 160 | + PyObject_Print(item, stdout, 0); |
| 161 | + printf("\n"); |
| 162 | + /* Py_DECREF(item); */ |
| 163 | + |
| 164 | + Py_INCREF(Py_None); |
| 165 | + return Py_None; |
| 166 | +} |
| 167 | + |
| 168 | +/* Test bad format character */ |
| 169 | + |
| 170 | +static PyObject * |
| 171 | +xx_roj(PyObject *self, PyObject *args) |
| 172 | +{ |
| 173 | + PyObject *a; |
| 174 | + long b; |
| 175 | + if (!PyArg_ParseTuple(args, "O#:roj", &a, &b)) |
| 176 | + return NULL; |
| 177 | + Py_INCREF(Py_None); |
| 178 | + return Py_None; |
| 179 | +} |
| 180 | + |
| 181 | + |
| 182 | +/* List of functions defined in the module */ |
| 183 | + |
| 184 | +static PyMethodDef xx_methods[] = { |
| 185 | + {"roj", xx_roj, METH_VARARGS}, |
| 186 | + {"foo", xx_foo, METH_VARARGS}, |
| 187 | + {"new", xx_new, METH_VARARGS}, |
| 188 | + {"bug", xx_bug, METH_VARARGS}, |
| 189 | + {NULL, NULL} /* sentinel */ |
| 190 | +}; |
| 191 | + |
| 192 | + |
| 193 | +/* Initialization function for the module (*must* be called initxx) */ |
| 194 | + |
| 195 | +DL_EXPORT(void) |
| 196 | +initmkcwtest(void) |
| 197 | +{ |
| 198 | + PyObject *m, *d; |
| 199 | + |
| 200 | + /* Initialize the type of the new type object here; doing it here |
| 201 | + * is required for portability to Windows without requiring C++. */ |
| 202 | + Xxo_Type.ob_type = &PyType_Type; |
| 203 | + |
| 204 | + /* Create the module and add the functions */ |
| 205 | + m = Py_InitModule("mkcwtest", xx_methods); |
| 206 | + |
| 207 | + /* Add some symbolic constants to the module */ |
| 208 | + d = PyModule_GetDict(m); |
| 209 | + ErrorObject = PyErr_NewException("xx.error", NULL, NULL); |
| 210 | + PyDict_SetItemString(d, "error", ErrorObject); |
| 211 | +} |
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