Image Scanning in pyinsane 2 gives StopIteration error

Question

I use Pyinsane 2 in Python - Django to scan a image via a network HP Printer. it detects the Device and all correctly. but while give scan_session = device.scan(multiple=False) it gives StopIteration error.

def scan_process(request): print('Scannned'); pyinsane2.init() try: devices = pyinsane2.get_devices() assert (len(devices) > 0) device = devices[0] print("I'm going to use the following scanner: %s" % (str(device)))

    try:
        pyinsane2.set_scanner_opt(device, 'source', ['ADF', 'Feeder'])

    except PyinsaneException:
        print("No document feeder found")

    pyinsane2.set_scanner_opt(device, 'mode', ['Gray'])

    pyinsane2.maximize_scan_area(device)
    scan_session = device.scan(multiple=False)
    try:
        while True:
            try:
                scan_session.scan.read()
            except EOFError:
                print("Got a page ! (current number of pages read: %d)" % (len(scan_session.images)))
    except StopIteration:
        print("Document feeder is now empty. Got %d pages" % len(scan_session.images))
    for idx in range(0, len(scan_session.images)):
        image = scan_session.images[idx]
        image.save("teste_%d.bmp" % idx)
finally:
    pyinsane2.exit()

def scan_process(request): print('Scannned'); pyinsane2.init() try: devices = pyinsane2.get_devices() assert (len(devices) > 0) device = devices[0] print("I'm going to use the following scanner: %s" % (str(device)))

    try:
        # pyinsane2.set_scanner_opt(device, 'source', ['ADF', 'Feeder'])
        pyinsane2.set_scanner_opt(device, 'source', ['ADF', 'Feeder'])

    except PyinsaneException:
        print("No document feeder found")
    # return

    # Beware: Some scanners have "Lineart" or "Gray" as default mode
    # better set the mode everytime
    pyinsane2.set_scanner_opt(device, 'mode', ['Gray'])

    # Beware: by default, some scanners only scan part of the area
    # they could scan.
    pyinsane2.maximize_scan_area(device)
    scan_session = device.scan(multiple=False)
    try:
        while True:
            try:
                scan_session.scan.read()
            except EOFError:
                print("Got a page ! (current number of pages read: %d)" % (len(scan_session.images)))
    except StopIteration:
        print("Document feeder is now empty. Got %d pages" % len(scan_session.images))
    for idx in range(0, len(scan_session.images)):
        image = scan_session.images[idx]
        image.save("teste_%d.bmp" % idx)
finally:
    pyinsane2.exit()

Answer 1

An immediate StopIteration means that the scanner reported having no sheet at all in the feeder. If you are using a flatbed scanner .. then it's a bug (but it's always hard to say if the bug comes from the driver or Pyinsane2 itself).

Note that I don't maintain Pyinsane2 anymore. I suggest you try using Libinsane instead: https://gitlab.gnome.org/World/OpenPaperwork/libinsane .