Vipsvalue_get_ref_string

const char*
vips_value_get_ref_string (
  const GValue* value,
  size_t* length
)

Get the C string held internally by the GValue.

`value`	`GValue`
	`GValue` to get from.
	The data is owned by the caller of the function.
`length`	`size_t*`
	Return length here, optionally.
	The argument will be set by the function.
	The argument can be `NULL`.
	The called function takes ownership of the data, and is responsible for freeing it.

Returns:	`utf8`
	The C string held by `value`.
	The data is owned by the called function.
	The string is a NUL terminated UTF-8 string.