生成的图片无法自动打印，PDF打印存在缩放问题求助

解决方案 #

方法1：用rundll32调用系统打印命令（无需额外依赖） #

Windows可通过rundll32.exe直接触发图片打印，指定打印机后可自动执行，不会弹出确认窗口。先在控制面板的「设备和打印机」中获取你的打印机名称，替换代码里的<打印机名称>：

import subprocess
from PIL import Image, ImageDraw, ImageFont

# 生成图片逻辑不变
img = Image.new("RGB", (300, 250), 'white')
draw = ImageDraw.Draw(img)
sticker_text = 'Name\nSurname\n\nCompany'
font = ImageFont.truetype('arial.ttf', size=40)
_, _, w, h = draw.textbbox((0, 0), sticker_text, font=font)
draw.text(((300 - w) / 2, (250 - h) / 2), sticker_text, font=font, fill='black', align='center')
img_path = 'sticker.jpg'
img.save(img_path)

# 自动打印图片，替换为你的实际打印机名称
printer_name = "你的打印机名称"
subprocess.run(
    ['rundll32.exe', 'C:\\Windows\\System32\\shimgvw.dll,ImageView_PrintTo', img_path, printer_name],
    shell=True,
    check=True
)

方法2：用win32print直接控制打印（需pywin32） #

通过win32print直接发送打印任务，适合批量打印场景，可精准控制打印位置：

import win32print
import win32ui
from PIL import Image, ImageDraw, ImageFont, ImageWin

# 生成图片逻辑不变
img = Image.new("RGB", (300, 250), 'white')
draw = ImageDraw.Draw(img)
sticker_text = 'Name\nSurname\n\nCompany'
font = ImageFont.truetype('arial.ttf', size=40)
_, _, w, h = draw.textbbox((0, 0), sticker_text, font=font)
draw.text(((300 - w) / 2, (250 - h) / 2), sticker_text, font=font, fill='black', align='center')

# 执行打印
printer_name = win32print.GetDefaultPrinter()
hDC = win32ui.CreateDC()
hDC.CreatePrinterDC(printer_name)
hDC.StartDoc("Sticker Print")
hDC.StartPage()

# 获取打印机可打印区域，计算居中坐标
print_area = hDC.GetDeviceCaps(8), hDC.GetDeviceCaps(10)
img_width, img_height = img.size
x = (print_area[0] - img_width) // 2
y = (print_area[1] - img_height) // 2

# 绘制图片到打印画布
dib = ImageWin.Dib(img)
dib.draw(hDC.GetHandleOutput(), (x, y, x+img_width, y+img_height))

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

生成PDF时将原图片居中放置在A4页面上，不做拉伸缩放，即可实现原比例打印。使用reportlab库实现：

1. 先安装依赖：

pip install reportlab

2. 修改代码生成带原尺寸图片的PDF：

from PIL import Image, ImageDraw, ImageFont
from reportlab.pdfgen import canvas
from reportlab.lib.pagesizes import A4
import win32api

# 生成原图片逻辑不变
img = Image.new("RGB", (300, 250), 'white')
draw = ImageDraw.Draw(img)
sticker_text = 'Name\nSurname\n\nCompany'
font = ImageFont.truetype('arial.ttf', size=40)
_, _, w, h = draw.textbbox((0, 0), sticker_text, font=font)
draw.text(((300 - w) / 2, (250 - h) / 2), sticker_text, font=font, fill='black', align='center')
img_path = 'sticker.jpg'
img.save(img_path)

# 生成A4 PDF，图片居中且保持原尺寸
pdf_path = 'sticker.pdf'
a4_width, a4_height = A4
img_width, img_height = img.size

c = canvas.Canvas(pdf_path, pagesize=A4)
x_pos = (a4_width - img_width) / 2
y_pos = (a4_height - img_height) / 2
c.drawImage(img_path, x_pos, y_pos, width=img_width, height=img_height)
c.save()

# 自动打印PDF
win32api.ShellExecute(0, "print", pdf_path, None, ".", 0)

内容的提问来源于stack exchange，提问作者MahoneyZ