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7.5.9 CObjects

Refer to Extending and Embedding the Python Interpreter, section 1.12, ``Providing a C API for an Extension Module,'' for more information on using these objects.

`PyCObject`
  This subtype of `PyObject` represents an opaque value, useful for C extension modules who need to pass an opaque value (as a `void*` pointer) through Python code to other C code. It is often used to make a C function pointer defined in one module available to other modules, so the regular import mechanism can be used to access C APIs defined in dynamically loaded modules.

int `PyCObject_Check`(PyObject *p)
  Returns true if its argument is a `PyCObject`.

PyObject* `PyCObject_FromVoidPtr`(void* cobj, void (*destr)(void *))
  Return value: New reference.
  Creates a `PyCObject` from the `void *`cobj. The destr function will be called when the object is reclaimed, unless it is `NULL`.

PyObject* `PyCObject_FromVoidPtrAndDesc`(void* cobj, void* desc, void (*destr)(void *, void *))
  Return value: New reference.
  Creates a `PyCObject` from the `void *`cobj. The destr function will be called when the object is reclaimed. The desc argument can be used to pass extra callback data for the destructor function.

void* `PyCObject_AsVoidPtr`(PyObject* self)
  Returns the object `void *` that the `PyCObject` self was created with.

void* `PyCObject_GetDesc`(PyObject* self)
  Returns the description `void *` that the `PyCObject` self was created with.