我需要一些关于 python 脚本的帮助。该脚本是 Python Pyinsane 模块的示例脚本。（Pyinsane https://github.com/jflesch/pyinsane）我想编写自己的扫描仪脚本，但要做到这一点，我应该了解示例代码或输出错误。
示例脚本。
import sys
``from PIL import Image
try:
import src.abstract as pyinsane
except ImportError:
import pyinsane.abstract as pyinsane
def set_scanner_opt(scanner, opt, value):
print("Setting %s to %s" % (opt, str(value)))
try:
scanner.options[opt].value = value
except (KeyError, pyinsane.SaneException) as exc:
print("Failed to set %s to %s: %s" % (opt, str(value), str(exc)))
if __name__ == "__main__":
steps = False
args = sys.argv[1:]
if len(args) <= 0 or args[0] == "-h" or args[0] == "--help":
print("Syntax:")
print(" %s [-s] <output file (JPG)>" % sys.argv[0])
print("")
print("Options:")
print(" -s : Generate intermediate images (may generate a lot of"
" images !)")
sys.exit(1)
for arg in args[:]:
if arg == "-s":
steps = True
args.remove(arg)
output_file = args[0]
print("Output file: %s" % output_file)
print("Looking for scanners ...")
devices = pyinsane.get_devices()
if (len(devices) <= 0):
print("No scanner detected !")
sys.exit(1)
print("Devices detected:")
print("- " + "\n- ".join([str(d) for d in devices]))
print("")
device = devices[0]
print("Will use: %s" % str(device))
print("")
source = 'Auto'
if (device.options['source'].constraint_type
== pyinsane.SaneConstraintType.STRING_LIST):
if 'Auto' in device.options['source'].constraint:
source = 'Auto'
elif 'FlatBed' in device.options['source'].constraint:
source = 'FlatBed'
else:
print("Warning: Unknown constraint type on the source: %d"
% device.options['source'].constraint_type)
set_scanner_opt(device, 'resolution', 300)
set_scanner_opt(device, 'source', source)
set_scanner_opt(device, 'mode', 'Color')
print("")
print("Scanning ... ")
scan_session = device.scan(multiple=False)
if steps and scan_session.scan.expected_size[1] < 0:
print("Warning: requested step by step scan images, but"
" scanner didn't report the expected number of lines"
" in the final image --> can't do")
print("Step by step scan images won't be recorded")
steps = False
if steps:
last_line = 0
expected_size = scan_session.scan.expected_size
img = Image.new("RGB", expected_size, "#ff00ff")
sp = output_file.split(".")
steps_filename = (".".join(sp[:-1]), sp[-1])
try:
PROGRESSION_INDICATOR = ['|', '/', '-', '\\']
i = -1
while True:
i += 1
i %= len(PROGRESSION_INDICATOR)
sys.stdout.write("\b%s" % PROGRESSION_INDICATOR[i])
sys.stdout.flush()
scan_session.scan.read()
if steps:
next_line = scan_session.scan.available_lines[1]
if (next_line > last_line):
subimg = scan_session.scan.get_image(last_line, next_line)
img.paste(subimg, (0, last_line))
img.save("%s-%05d.%s" % (steps_filename[0], last_line,
steps_filename[1]), "JPEG")
last_line = next_line
except EOFError:
pass
print("\b ")
print("Writing output file ...")
img = scan_session.images[0]
img.save(output_file, "JPEG")
print("Done")
现在输出：
sudo python /home/pi/Desktop/scantest.py -s 1
Output file: 1
Looking for scanners ...
Devices detected:
- Scanner 'genesys:libusb:001:006' (Canon, LiDE 110, flatbed scanner)
Will use: Scanner 'genesys:libusb:001:006' (Canon, LiDE 110, flatbed scanner)
Setting resolution to 300
Setting source to Auto
Failed to set source to Auto: <class 'pyinsane.rawapi.SaneStatus'> : Data is invalid (4)
Setting mode to Color
Scanning ...
|Traceback (most recent call last):
File "/home/pi/Desktop/scantest.py", line 107, in <module>
steps_filename[1]), "JPEG")
File "/usr/local/lib/python2.7/dist-packages/PIL/Image.py", line 1439, in save
save_handler(self, fp, filename)
File "/usr/local/lib/python2.7/dist-packages/PIL/PngImagePlugin.py", line 572, in _save
ImageFile._save(im, _idat(fp, chunk), [("zip", (0,0)+im.size, 0, rawmode)])
File "/usr/local/lib/python2.7/dist-packages/PIL/ImageFile.py", line 481, in _save
e = Image._getencoder(im.mode, e, a, im.encoderconfig)
File "/usr/local/lib/python2.7/dist-packages/PIL/Image.py", line 399, in _getencoder
return apply(encoder, (mode,) + args + extra)
TypeError: an integer is required
请任何人都可以解释示例代码或帮助我解决输出错误吗？
非常感谢
月桂酸