在 CUPS 中出现错误“页面设置信息无效”从 python 脚本打印图像

编程问答 2022-05-21

问题描述

我尝试在 Debian 10 上使用 cups 从 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，但我看到 Cups 用户界面 (localhost:631) 中的打印和错误被取消，并显示一条消息： “页面设置信息无效。”

CUPS message screenshot

我想我应该为图像发送打印做一些准备，但我没有找到任何有关它的信息。 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。

我可以对 Debian 中的镜像进行相同的操作吗？

感谢您的帮助！

解决方法

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