Pyinsane doesn't complete scanning

[Feulo]

Hi there,

I am trying to automate sccanning a batch of document with a script in python using Pyinsane2. But when I Call the scan_session = device.scan(multiple=True) routine I get the mesage "Pyinsane: Stream::QueryInterface(): Unknown interface requested" several times, and the python and if i press enter it returns an empty scan_sessions.images, and doesn't proceed to the next sheet.

I am using python 3.6 in a Windows 10 with WIA2, the scanner is a Lexmark all-in-one Mx410de and the connection is over lan.

Any guesses on How to fix this? Thanks

[jflesch]

Hm, weird. This message means your WIA driver requested an object type (C++) that Pyinsane is unable to provide ( https://github.com/jflesch/pyinsane/blob/stable/src/pyinsane2/wia/transfer.cpp#L159 ). The problem here is figuring which one. I'm going to push a patch later to see if we can get the name of the interface requested (note to myself: https://msdn.microsoft.com/en-us/library/windows/desktop/ms688692%28v=vs.85%29.aspx ).
Depending of your scanner driver, it may or may not be the root of your problem.

Regarding the empty scan_sessions.images, would it be possible to have a extract of your code please ?

[Feulo]

Hi,

The problem with the empty scan_sessions.images stopped when i start running the script on the command prompt instead of running in the python shell. I finally get the image of the scanned document, but it only scan 1 sheet from the ADF and then stops and exit. The code is basically the multiple scan example in the README.md (I uploaded it as a .txt because the I can´t upload a .py here). I'm also including the output on the command prompt thats different form the output in the python shell, I guess the problem is about the great number of warnings i get when running the script, but i don't know how to fix them
output.txt
teste.txt

[jflesch]

One thing that could be of help too is also the output of the script examples/list_all.py. It returns all the options supported by your scanner. Maybe something is not set right.

[jflesch]

BTW, I assume you installed Pyinsane using python wheels ? Can you tell me which version it has installed please ?

[jflesch]

There is another thing you can try : You can try Paperwork.
If it doesn't work with Paperwork, we will know for sure it's a bug in Pyinsane.

[Feulo]

right, as soon as I return home I will do this and i post the results here.(probably by sunday)

[Feulo]

Hi there,

My pyinsane version is 'pyinsane2==2.0.9' and the pillow version 'Pillow==4.0.0'. I'm uploading the output of the list_all example, there's a lot of option that don't match the constraints, i guess this can be the problem as you said.

output_list.txt

[Feulo]

Hi, I tried with Paperwork and it worked. When I run teste.py it scan 2 pages and the stop. I guess the problem is to pyinsane to get the scanner signal inform if there's more pages on ADF or no. In Paperwork it scanned all the pages, but i had to inform paperwork the number of pages previosly.

When a I run the teste.py it scan the first 2 pages and stops, I noticed that when it stops the last page scanned it's still in the ADF, and the ADF cylinder that pulls the next page is in position to pull the next page (and not in its rest position).

After that, if i try to scan with paperwork the option "Scan from Feeder" is disabled. An if I run the teste.py again I get the error:

Got a page ! (current number of pages read: 1)
Document feeder is now empty. Got 1 pages
C:\Users\USER\AppData\Local\Programs\Python\Python36\lib\site-packages\pyinsane2\wia\rawapi.py:191: RuntimeWarning: Pyinsane: WARNING: source->transfer->Download() failed
out.buffer,
Pyinsane: WARNING: source->transfer->Download() failed
Pyinsane: WARNING: source->transfer->Download() failed: -2145320954 ; Unknown error 0x80210006

Well, that's it, I hope that it is just a configuration of the scanner problem. Thanks again for helping

[jflesch]

In Paperwork, the number of pages is purely informal. It's just so, at the end, the user can be sure that the expected number of page has been scanned (no pages going as a single one in the feeder, etc).
In other words, if it works in Paperwork, it should work from your script too :/

How many pages are you trying to scan in total ?

BTW, did you try the script examples/scan_adf.py ? It is very similar to your script, but has very very minor differences. If it works, it could give us a good hint about the problem here.

"Scan from Feeder" is disabled.

Well, that's a bug. I'm going to have a look.
If you want to re-enable it manually, in your home directory (C:\Users\[login]), look for a hidden directory ".config", containing a file "paperwork.conf". Edit this file, and just replace the line has_feeder = False by has_feeder = True.

[jflesch]

BTW, I forgot to specify: I've seen that drivers (Linux or Windows ..) tend to be really buggy and have really weird and annoying behaviors when something unexpected happens. When the behavior is becoming really odd (like in the last output you provided), you .. may have to restart your computer before retrying ... :/

[Feulo]

I restarted my computer now and tried with Paperwork without setting the number of pages, the result was the same as the teste.py script, it stopped on the second page, with the bottom of the second sheet still in the ADF and the ADF cylinder in contact with the next sheet. I the tried again now setting the number of pages in Paperwork to 4 this way it scanned all the 4 sheets with no problem.

I will restart everything and try the scan_adf.py and post what happened here

[Feulo]

Well, I tried with the scan_adf.py it scanned all the four pages (yay!) but it retirned an unknown error at the end =/. I'm uploading the output here. (i don't know if this will be an issue, i will try to convert the images to a pdf inside the script and if it worked I'm happy lol.
BTW I did another test with Paperwork, I have set the number of pages to 2. it scanned the first 2 pages, the started the third and stopped the same way as before, with th bottom of the page stucked on the ADF
output_scan_adf.txt

[jflesch]

I have a feeling it's not really a problem of indicating the number of pages to Paperwork, using your script or using scan_adf.py. With your scanner driver, it seems just random :-(

Just a quick note : when I said the number of page doesn't matter to Paperwork, it's not exactly true actually .. if you ask for less pages than what is in the scanner feeder, it will stop as soon as it has what is wanted. (I should have specified that from the start I guess :/).

The error you got at the end of scan_adf.py is 0x80210003 = WIA_ERROR_PAPER_EMPTY.
That's the first driver I see using this code ... I guess I will have to add it to Pyinsane.

[jflesch]

36af5fd << I've added support for the error code returned by your driver.

BTW, just to be sure, did you try your feeder with any other scanning application supporting it ?

[Feulo]

Hi, I did a few more tests, I still did'nt figure out what's causing the problem, but I guess i founded a solution. I'm uploading 2 python scripts

the "scan" script is scanning only one page and the crashs with a error and the second page to be scanned stucked in the ADF.

the "teste" scrip is working just fine, it scans all the pages and saves them. It still gives the error message:

C:\Users\USER\AppData\Local\Programs\Python\Python36\lib\site-packages\pyinsane2\wia\rawapi.py:191: RuntimeWarning: Pyinsane: WARNING: source->transfer->Download() failed
out.buffer,
Pyinsane: WARNING: source->transfer->Download() failed
Pyinsane: WARNING: source->transfer->Download() failed: -2145320954 ; Unknown error 0x80210006

but it scans all the images and I've doing the work i need without any problem

The funny thing is that for me the 2 scripts are exactly the same, I copied the scan_adf.py to make both. so I heva no idea of what is wrong.

Thanx for the fixing of the error code. I installed the pyinsane via pip, if I clone your repo and compile the will it work?

thnx for all the helping!!
teste.txt
scan.txt