Specifies the type of the function passed to
poppler_attachment_save_to_callback(). It is called once for each block of
bytes that is "written" by poppler_attachment_save_to_callback(). If
successful it should return %TRUE. If an error occurs it should set
error and return %FALSE, in which case poppler_attachment_save_to_callback()
will fail with the same error.
Specifies the type of the function passed to poppler_attachment_save_to_callback(). It is called once for each block of bytes that is "written" by poppler_attachment_save_to_callback(). If successful it should return %TRUE. If an error occurs it should set
errorand return %FALSE, in which case poppler_attachment_save_to_callback() will fail with the same error.