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支持混合打印？

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支持混合打印？

我需要生成并打印一个文档，其中大多数页面打印在 A4 标签上（来自打印机的旁路纸盘），一些分隔页打印在普通 A3 纸上（来自另一个纸盘）。

目前，我正在使用 Python 和 Reportlab，并且我知道如何生成混合页面大小的文档（A4 为主页，A3 为分隔页）。但是当我用 evince 打印它时，我必须选择打印的页面尺寸，并且所有页面都在相同的页面尺寸上并从同一个纸盘打印......

有没有办法让我的文档在不同纸盒中以不同纸张尺寸打印主页和分隔页？

答案1

感谢 meuh 的帮助，我可以编写一个简短的 Python 程序，使用特定于设备的setpagedevice命令将我使用现有程序生成的 PDF 转换为 PostScript 文件。

该程序非常适合我的使用，但我认为作为起点，对其他人来说可能很有用。这里是：

#! /usr/bin/env python3

import argparse
import re
import subprocess
import sys

import PyPDF2

def make_postscript(f):
    """Convert a PDF file to PostScript, with pdf2ps, and yield it line by line."""
    with subprocess.Popen(['pdf2ps', '/dev/stdin', '/dev/stdout'], stdin=f, stdout=subprocess.PIPE, stderr=None) as proc:
        for line in proc.stdout:
            yield line

def add_device_control(postscript, separator_pages):
    """Add device control commands to a PostScript file with DSC comments."""
    DSC_page_re = re.compile(b'%%Page: (?P<page_name>.+) (?P<page_number>[1-9][0-9]*)$')
    DSC_begin_page_setup_re = re.compile(b'%%BeginPageSetup$')
    page_number = None
    for line in postscript:
        m = DSC_page_re.match(line)
        if m:
            assert page_number is None
            page_number = int(m.group('page_number').decode('ASCII'))-1
            yield line
            continue
        m = DSC_begin_page_setup_re.match(line)
        if m:
            assert page_number is not None
            yield line
            if page_number in separator_pages:
                yield b'mark { << /PageSize [1191 842] /ImagingBBox null /MediaType (Plain) /MediaPosition null >> setpagedevice } stopped cleartomark\n'
            elif page_number not in separator_pages:
                yield b'mark { << /PageSize [595 842] /ImagingBBox null /MediaType (Labels) /MediaPosition 0 >> setpagedevice } stopped cleartomark\n'
            page_number = None
            continue
        yield line
    assert page_number is None

def walk_outline(outline, depth=0):
    """Walk through the outline of a PDF file in a depth-first search way, and yield each element with its zero-based depth."""
    for obj in outline:
        if isinstance(obj, PyPDF2.pdf.Destination):
            yield depth, obj
        elif isinstance(obj, list):
            for result in walk_outline(obj, depth+1):
                yield result
        else:
            assert False

def find_separator_pages(f):
    """Find the page number of the separator pages in a PDF file"""
    separator_pages = set()
    reader = PyPDF2.PdfFileReader(f)
    for depth, obj in walk_outline(reader.outlines):
        page_num = reader._getPageNumberByIndirect(obj.page)
        if depth == 0:
            assert page_num >= 0
            separator_pages.add(page_num)
    return separator_pages

def main():
    parser = argparse.ArgumentParser()
    parser.add_argument("input_file", metavar="input.pdf", type=argparse.FileType('rb'))
    parser.add_argument("output_file", metavar="output.ps", nargs="?", type=argparse.FileType('wb'), default=sys.stdout.buffer)
    args = parser.parse_args()

    separator_pages = find_separator_pages(args.input_file)
    args.input_file.seek(0)
    postscript = make_postscript(args.input_file)
    postscript = add_device_control(postscript, separator_pages)
    for line in postscript:
        args.output_file.write(line)

if __name__ == "__main__":
    main()

再次非常感谢 meuh 在评论中提供的帮助。

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