Length of Labels are longer than 256

[luposung]

Thanks for your work, this lib helps me a lot.
I'm wondering how to append more characters into a single cell if their length is longer than a byte. I've tried inputing a two-byte length but failed although it seems to be acceptable according to a spec written by someone from Open Office. Appreciated for any help. Thanks.

[mecenas]

In BIFF2 excell format label cells can contains to 256 characters