[sane-devel] Brother: does not scan

[AugustQ]

Hi,


another approach:

this is what I get from simple-scann:

[+3,18s] DEBUG: scanner.vala:891: sane_open ("brother2:bus1;dev4") ->
SANE_STATUS_INVAL
[+3,18s] WARNING: scanner.vala:895: Unable to open device: Invalid argument


the function sane-open() returns this value: SANE_STATUS_INVAL.

I found this function in the SANE-sources in the file backend/net.c. The
function looks like:

SANE_Status
sane_open (SANE_String_Const full_name, SANE_Handle * meta_handle)


In this file I see macros of the type DBG(). How can I activate these
macros?


With these messages I hope to find the line that causes the return-code
of SANE_STATUS_INVAL. Maybe this will help.

AugustQ



Am 05.05.20 um 12:22 schrieb AugustQ:
> Hi,
>
>
> I have an old workhorse, a Brother DCP 7010. This works (=scans) on
> Ubuntu 16.04, but refuses to scan on Ubuntu 18.04 and 20.04 (in VM).
>
> It prints without any problems.
>
>
> The error-message of simple-scan on U18.04 is:
>
> [+23,49s] DEBUG: simple-scan.vala:454: Requesting scan at 300 dpi from
> device 'bus4;dev1'
> [+23,49s] DEBUG: scanner.vala:1569: Scanner.scan ("bus4;dev1", dpi=300,
> scan_mode=ScanMode.COLOR, depth=8, type=ScanType.SINGLE, paper_width=0,
> paper_height=0, brightness=0, contrast=0, delay=10000ms)
> [+23,49s] DEBUG: scanner.vala:806: Processing request
> [+23,50s] DEBUG: scanner.vala:867: sane_open ("bus4;dev1") ->
> SANE_STATUS_INVAL
> [+23,50s] WARNING: scanner.vala:871: Unable to get open device: Invalid
> argument
>
> XSane delivers a similar argument. There is also a simple program on
> GitHub with the name hellosane, but it also does not work.
>
> lsusb shows me:
>
> Bus 001 Device 005: ID 04f9:0182 Brother Industries, Ltd DCP-7010
>
>
> I downloaded the sources of version 1.0.29 and it compiled OK. So how
> can I activate the macros DBG(x."...")?
>
> My assumption is that the problem happens in the function sane_open()
> (in net.c). By using these macros I hope to narrow down the reason of my
> problem.
>
>
> Any tips please.
>
> Thanks
>
> AugustQ
>
>
> PS: sane-find-scanner delivers:
>
> [12:19:21.752915] [sanei_usb] libusb_scan_devices: device 0x04f9/0x0182,
> interface 0 doesn't look like a scanner (0/7)
> [12:19:21.752933] [sanei_usb] libusb_scan_devices: found libusb-1.0
> device (0x04f9/0x0182) interface 1 at libusb:001:005
> [12:19:21.752945] [sanei_usb] store_device: add dn 0 with libusb:001:005
>
> ....
>
> found USB scanner (vendor=0x04f9, product=0x0182) at libusb:001:005
>
>
>
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