Thank you so much for your support allan. I will take note of this.
On Wed, Mar 9, 2016 at 8:17 PM, m. allan noah wrote:
> Yes- the value of maxlen is determined by the frontend. You cannot
> change it, and you certainly cannot re-alloc. You should have your own
> buffer in the backend, and read
Yes- the value of maxlen is determined by the frontend. You cannot
change it, and you certainly cannot re-alloc. You should have your own
buffer in the backend, and read bytes from it into the buffer provided
by the frontend. This type of double buffering will allow you to read
from the scanner in
Thank you for such quick response, allan. Do you mean to say that the value
of maxlen is determined by the frontend? On xsane application, maxlen value
is 8192 when using acquire preview and then value of maxlen is 65536 when
using scan function. Our external backend currently reads images by row o
Because different frontends have different requirements. Some try to
save memory, some try to maximize speed by using large buffers, some
try to fill a network packet exactly. You can (and should expect) to
get any value of maxlen from 1 byte to perhaps a 1M, maybe more.
allan
On Tue, Mar 8, 2016
why does the value of maxlen vary from various frontends?
On Tue, Mar 8, 2016 at 9:06 PM, m. allan noah wrote:
> maxlen is provided by the caller of the function, to tell the backend
> how much memory the caller has allocated for image data.
>
> allan
>
> On Tue, Mar 8, 2016 at 3:09 AM, ky gcp
maxlen is provided by the caller of the function, to tell the backend
how much memory the caller has allocated for image data.
allan
On Tue, Mar 8, 2016 at 3:09 AM, ky gcp wrote:
> hi,
>
> how is the argument maxlen determined in sane_read() function?
>
> SANE_Status sane_read (SANE_Handle h, SA
hi,
how is the argument maxlen determined in sane_read() function?
SANE_Status sane_read (SANE_Handle h, SANE_Byte * buf, SANE_Int maxlen,
SANE_Int * len);
Thanks for your help.
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