[sane-devel] image lines is -1 according to sane_get_parameters

[dabicho]

Hi.
I am writing a front-end.
In previous version, after sane_start, sane_get_parameters would tell
me how much memory I would need to allocate for the image.
I am using 1.0.22-5 (from fedora) to support a new scanner, but after
sane_get_parameters I am told the image is "-1" lines high.
What does that mean? I have not received any error, and xsane works alright.

or how sould I go about it as a turn around?

any pointer please?

Thank you