Hi, On Tue, Feb 25, 2003 at 11:36:51AM -0500, Matto Marjanovic wrote: > Suppose a scan is set-up and initiated, and sane_parameters() returns > a definite value for 'lines' (i.e., not -1). What should a backend > do if, before that number of lines is delivered, sand_read() returns > with SANE_STATUS_EOF? Will/should the frontend abort the scan, or > gracefully truncate the output? (Or fill the remaining output with > black/white?)
Print a warning and ask the user what to do. Or let the user decide by preferences. > I guess another version of my question is: If the backend cannot be > *certain* that it will deliver 'lines' lines of data, is it required > to set 'lines' to -1? (Or, can/should it provide the optimistic > intended image size, which assumes that the paper is long enough?) You're speaking about a sheet-fed scanner? I'd use lines = -1 in this case by default. Maybe add an option "image size" (A4, Legal, automatic) and use lines = -1 for automatic and a fixed size for the other settings. Bye, Henning
