### Function

# GLib ucs4_to_utf8

since: 2.0

#### Declaration

    gchar*
    g_ucs4_to_utf8 (
      const gunichar* str,
      glong len,
      glong* items_read,
      glong* items_written,
      GError** error
    )

#### Description

Convert a string from a 32-bit fixed width representation as UCS-4. to UTF-8. The result will be terminated with a 0 byte.

Available since: 2.0

#### Parameters

`str`

  Type: An array of `gunichar`

  A UCS-4 encoded string.

  The length of the array is specified in the `len` argument.
  The data is owned by the caller of the function.

`len`

  Type: `glong`

  The maximum length (number of characters) of `str` to use. If `len` < 0, then the string is nul-terminated.

`items_read`

  Type: `glong*`

  Location to store number of characters read, or `NULL`.

  The argument will be set by the function.
  The argument can be `NULL`.

`items_written`

  Type: `glong*`

  Location to store number of bytes written or `NULL`. The value here stored does not include the trailing 0 byte.

  The argument will be set by the function.
  The argument can be `NULL`.

`error`

  Type: `GError **`

  The return location for a recoverable error.

  The argument can be `NULL`.
  If the return location is not `NULL`, then you must initialize it to a `NULL` `GError*`.
  The argument will be left initialized to `NULL` by the function if there are no errors.
  In case of error, the argument will be set to a newly allocated `GError`; the caller will take ownership of the data, and be responsible for freeing it.

#### Return value

Type: `gchar*`

A pointer to a newly allocated UTF-8 string. This value must be freed with g_free(). If an error occurs, `NULL` will be returned and `error` set. In that case, `items_read` will be set to the position of the first invalid input character.

The caller of the function takes ownership of the data, and is responsible for freeing it.
The value is a NUL terminated UTF-8 string.