.. highlightlang:: c

.. index::
 object: memoryview

MemoryView objects

A :class:`memoryview` object exposes the C level :ref:`buffer interface <bufferobjects>` as a Python object which can then be passed around like any other object.

.. c:function:: PyObject *PyMemoryView_FromObject(PyObject *obj)

 Create a memoryview object from an object that provides the buffer interface.
 If *obj* supports writable buffer exports, the memoryview object will be
 read/write, otherwise it may be either read-only or read/write at the
 discretion of the exporter.

.. c:function:: PyObject *PyMemoryView_FromMemory(char *mem, Py_ssize_t size, int flags)

 Create a memoryview object using *mem* as the underlying buffer.
 *flags* can be one of :c:macro:`PyBUF_READ` or :c:macro:`PyBUF_WRITE`.

 .. versionadded:: 3.3

.. c:function:: PyObject *PyMemoryView_FromBuffer(Py_buffer *view)

 Create a memoryview object wrapping the given buffer structure *view*.
 For simple byte buffers, :c:func:`PyMemoryView_FromMemory` is the preferred
 function.

.. c:function:: PyObject *PyMemoryView_GetContiguous(PyObject *obj, int buffertype, char order)

 Create a memoryview object to a :term:`contiguous` chunk of memory (in either
 'C' or 'F'ortran *order*) from an object that defines the buffer
 interface. If memory is contiguous, the memoryview object points to the
 original memory. Otherwise, a copy is made and the memoryview points to a
 new bytes object.

.. c:function:: int PyMemoryView_Check(PyObject *obj)

 Return true if the object *obj* is a memoryview object. It is not
 currently allowed to create subclasses of :class:`memoryview`.

.. c:function:: Py_buffer *PyMemoryView_GET_BUFFER(PyObject *mview)

 Return a pointer to the memoryview's private copy of the exporter's buffer.
 *mview* **must** be a memoryview instance; this macro doesn't check its type,
 you must do it yourself or you will risk crashes.

.. c:function:: Py_buffer *PyMemoryView_GET_BASE(PyObject *mview)

 Return either a pointer to the exporting object that the memoryview is based
 on or *NULL* if the memoryview has been created by one of the functions
 :c:func:`PyMemoryView_FromMemory` or :c:func:`PyMemoryView_FromBuffer`.
 *mview* **must** be a memoryview instance.

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