open
Same as the standard UNIX routine iconv_open(), but may be implemented via libiconv on UNIX flavors that lack a native implementation.
GLib provides g_convert() and g_locale_to_utf8() which are likely more convenient than the raw iconv wrappers.
Return
a "conversion descriptor", or (GIConv)-1 if opening the converter failed.
Parameters
toCodeset
destination codeset
fromCodeset
source codeset