Character Set Conversion @str: @len: @to_codeset: @from_codeset: @bytes_read: @bytes_written: @error: @Returns: @str: @len: @to_codeset: @from_codeset: @fallback: @bytes_read: @bytes_written: @error: @Returns: @opsysstring: @Returns: @error: @utf8string: @Returns: @error: @G_CONVERT_ERROR_NO_CONVERSION: @G_CONVERT_ERROR_ILLEGAL_SEQUENCE: @G_CONVERT_ERROR_FAILED: