# 编解码器注册与支持功能

int `PyCodec_Register`( PyObject *search_function)

  注册一个新的编解码器搜索函数。

  作为副作用，其尝试加载 `encodings` 包，如果尚未完成，请确保它始终位于搜索函数列表的第一位。

int `PyCodec_KnownEncoding`(const char *encoding)

  根据注册的给定 encoding 的编解码器是否已存在而返回 `1` 或 `0`。此函数总能成功。

PyObject* `PyCodec_Encode`( PyObject *object, const char *encoding, const char *errors)
  Return value: New reference.

  泛型编解码器基本编码 API。

  object is passed through the encoder function found for the given encoding using the error handling method defined by errors. errors may be `NULL` to use the default method defined for the codec. Raises a `LookupError` if no encoder can be found.

PyObject* `PyCodec_Decode`( PyObject *object, const char *encoding, const char *errors)
  Return value: New reference.

  泛型编解码器基本解码 API。

  object is passed through the decoder function found for the given encoding using the error handling method defined by errors. errors may be `NULL` to use the default method defined for the codec. Raises a `LookupError` if no encoder can be found.

## Codec 查找API

In the following functions, the encoding string is looked up converted to all lower-case characters, which makes encodings looked up through this mechanism effectively case-insensitive. If no codec is found, a `KeyError` is set and `NULL` returned.

PyObject* `PyCodec_Encoder`(const char *encoding)
  Return value: New reference.

  Get an encoder function for the given encoding.

PyObject* `PyCodec_Decoder`(const char *encoding)
  Return value: New reference.

  Get a decoder function for the given encoding.

PyObject* `PyCodec_IncrementalEncoder`(const char *encoding, const char *errors)
  Return value: New reference.

  Get an `IncrementalEncoder` object for the given encoding.

PyObject* `PyCodec_IncrementalDecoder`(const char *encoding, const char *errors)
  Return value: New reference.

  Get an `IncrementalDecoder` object for the given encoding.

PyObject* `PyCodec_StreamReader`(const char *encoding, PyObject *stream, const char *errors)
  Return value: New reference.

  Get a `StreamReader` factory function for the given encoding.

PyObject* `PyCodec_StreamWriter`(const char *encoding, PyObject *stream, const char *errors)
  Return value: New reference.

  为给定的 encoding 获取一个 `StreamWriter` 工厂函数。

## 用于Unicode编码错误处理程序的注册表API

int `PyCodec_RegisterError`(const char *name, PyObject *error)

  Register the error handling callback function error under the given name. This callback function will be called by a codec when it encounters unencodable characters/undecodable bytes and name is specified as the error parameter in the call to the encode/decode function.

  The callback gets a single argument, an instance of `UnicodeEncodeError`, `UnicodeDecodeError` or `UnicodeTranslateError` that holds information about the problematic sequence of characters or bytes and their offset in the original string (see Unicode Exception Objects for functions to extract this information). The callback must either raise the given exception, or return a two-item tuple containing the replacement for the problematic sequence, and an integer giving the offset in the original string at which encoding/decoding should be resumed.

  成功则返回``0`` ，失败则返回``-1``

PyObject* `PyCodec_LookupError`(const char *name)
  Return value: New reference.

  Lookup the error handling callback function registered under name. As a special case `NULL` can be passed, in which case the error handling callback for "strict" will be returned.

PyObject* `PyCodec_StrictErrors`( PyObject *exc)
  Return value: Always NULL.

  Raise exc as an exception.

PyObject* `PyCodec_IgnoreErrors`( PyObject *exc)
  Return value: New reference.

  Ignore the unicode error, skipping the faulty input.

PyObject* `PyCodec_ReplaceErrors`( PyObject *exc)
  Return value: New reference.

  Replace the unicode encode error with `?` or `U+FFFD`.

PyObject* `PyCodec_XMLCharRefReplaceErrors`( PyObject *exc)
  Return value: New reference.

  Replace the unicode encode error with XML character references.

PyObject* `PyCodec_BackslashReplaceErrors`( PyObject *exc)
  Return value: New reference.

  Replace the unicode encode error with backslash escapes (`\x`, `\u` and `\U`).

PyObject* `PyCodec_NameReplaceErrors`( PyObject *exc)
  Return value: New reference.

  Replace the unicode encode error with `\N{...}` escapes.

  3.5 版新加入.