从 python 脚本打印图像时在 CUPS "The page setup information was not valid." 中出现错误

Question

我尝试使用 cups 从 Debian 10 上的 python 脚本打印图像：

import cups

def printImageLinux(image_name):
    conn = cups.Connection()
    printer = conn.getDefault()
    conn.printFile(printer, image_name, 'suo_ticket', {})

最后，图像开始打印，但我在 Cups 用户界面 (localhost:631) 中看到取消打印和错误消息： “页面设置信息无效。”

CUPS message screenshot

我想我应该做一些图像发送打印的准备，但我没有找到任何相关信息。我可以使用 win32print 模块和代码从 Windows 打印相同的图像：

import os, sys
from win32 import win32api, win32print
from PIL import Image, ImageWin

def printImage(image_name):
    # Constants for GetDeviceCaps
    # HORZRES / VERTRES = printable area
    HORZRES = 8
    VERTRES = 10

    # LOGPIXELS = dots per inch
    LOGPIXELSX = 88
    LOGPIXELSY = 90

    # PHYSICALWIDTH/HEIGHT = total area
    PHYSICALWIDTH = 110
    PHYSICALHEIGHT = 111

    # PHYSICALOFFSETX/Y = left / top margin
    PHYSICALOFFSETX = 112
    PHYSICALOFFSETY = 113

    printer_name = win32print.GetDefaultPrinter ()
    file_name = image_name

    #
    # You can only write a Device-independent bitmap
    #  directly to a Windows device context; therefore
    #  we need (for ease) to use the Python Imaging
    #  Library to manipulate the image.
    #
    # Create a device context from a named printer
    #  and assess the printable size of the paper.
    #
    hDC = win32ui.CreateDC ()
    hDC.CreatePrinterDC (printer_name)
    printable_area = hDC.GetDeviceCaps (HORZRES), hDC.GetDeviceCaps (VERTRES)
    printer_size = hDC.GetDeviceCaps (PHYSICALWIDTH), hDC.GetDeviceCaps (PHYSICALHEIGHT)
    printer_margins = hDC.GetDeviceCaps (PHYSICALOFFSETX), hDC.GetDeviceCaps (PHYSICALOFFSETY)

    #
    # Open the image, rotate it if it's wider than
    #  it is high, and work out how much to multiply
    #  each pixel by to get it as big as possible on
    #  the page without distorting.
    #
    bmp = Image.open (file_name)
    if bmp.size[0] > bmp.size[1]:
      bmp = bmp.rotate (90)

    ratios = [1.0 * printable_area[0] / bmp.size[0], 1.0 * printable_area[1] / bmp.size[1]]
    scale = min (ratios)

    #
    # Start the print job, and draw the bitmap to
    #  the printer device at the scaled size.
    #
    hDC.StartDoc (file_name)
    hDC.StartPage ()

    dib = ImageWin.Dib (bmp)
    scaled_width, scaled_height = [int (scale * i) for i in bmp.size]
    x1 = int ((printer_size[0] - scaled_width) / 2)
    y1 = int ((printer_size[1] - scaled_height) / 2)
    x2 = x1 + scaled_width
    y2 = y1 + scaled_height
    dib.draw (hDC.GetHandleOutput (), (x1, y1, x2, y2))

    hDC.EndPage ()
    hDC.EndDoc ()
    hDC.DeleteDC ()

它工作正常。

我可以在Debian中对镜像进行同样的操作吗？

感谢您的帮助！

Answer 1

问题已通过使用 PIL 模块解决。工作代码：

import cups
from PIL import Image

def printImageLinux(image_name):
    conn = cups.Connection()
    printer = conn.getDefault()

    image1 = Image.open(image_name)
    im1 = image1.convert('RGB')
    im1.save('temp_image.pdf')
    conn.printFile(printer, 'temp_image.pdf', 'suo_ticket', {'fit-to-page':'True'})

从 python 脚本打印图像时在 CUPS "The page setup information was not valid." 中出现错误

Getting error in CUPS "The page setup information was not valid." with printing image from python script

python

linux

printing

debian

cups