python连接打印机实现打印文档、图片、pdf文件等功能

import tempfile
import win32api
import win32print

filename = tempfile.mktemp (".txt")
open (filename, "w").write ("This is a test")
win32api.ShellExecute (
 0,
 "print",
 filename,
 #
 # If this is None, the default printer will
 # be used anyway.
 #
 '/d:"%s"' % win32print.GetDefaultPrinter (),
 ".",
 0
)

import tempfile
import win32api
import win32print

filename = tempfile.mktemp (".txt")
open (filename, "w").write ("This is a test")
win32api.ShellExecute (
 0,
 "printto",
 filename,
 '"%s"' % win32print.GetDefaultPrinter (),
 ".",
 0
)

import os, sys
import win32print
printer_name = win32print.GetDefaultPrinter ()
#
# raw_data could equally be raw PCL/PS read from
# some print-to-file operation
#
if sys.version_info >= (3,):
 raw_data = bytes ("This is a test", "utf-8")
else:
 raw_data = "This is a test"

hPrinter = win32print.OpenPrinter (printer_name)
try:
 hJob = win32print.StartDocPrinter (hPrinter, 1, ("test of raw data", None, "RAW"))
 try:
  win32print.StartPagePrinter (hPrinter)
  win32print.WritePrinter (hPrinter, raw_data)
  win32print.EndPagePrinter (hPrinter)
 finally:
  win32print.EndDocPrinter (hPrinter)
finally:
 win32print.ClosePrinter (hPrinter)

import win32print
import win32ui
from PIL import Image, ImageWin

#
# 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 = "test.jpg"

#
# 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 ()

# 打印二维码
def print_barcode(request):
  import pyqrcode
  import random,string
  from PIL import Image,ImageDraw,ImageFont
  import numpy as np
  if request.is_ajax() and request.method == 'POST':
    result = {}
    bar_string = 'NaN'
    type = request.POST['type']

    if type == 'box':
      # 生成箱子码
      # 格式：P190823-K91 [P][日期][-][A-Z][0-9][0-9]
      bar_string = 'P'+datetime.date.today().strftime('%y%m%d')+'-'+str(random.choice('ABCDEFGHIGKLMNOPQRSTUVWXYZ'))\
             + str(random.choice(range(10)))+ str(random.choice(range(10)))
    elif type == 'kuwei':
      # 生成库位码
      bar_string = request.POST['string']
    else:
      pass

    try:
      big_code = pyqrcode.create(bar_string, error='L', version=2 , mode='binary')
      big_code.png('./code.png', scale=8)
      img_code = Image.open('code.png')

      size = img_code.size
      img_final = Image.new('RGB', (size[0], size[1]+35), color=(255, 255, 255))
      img_final.paste(img_code, (0, 0, size[0], size[1]))

      draw = ImageDraw.Draw(img_final)
      font = ImageFont.truetype('AdobeGothicStd-Bold.otf', size=35)
      width, height = draw.textsize(bar_string,font=font)
      draw.text(((size[0]-width)/2, size[1]-15), bar_string , fill=(0, 0, 0), font=font)
      img_final.save('./code.png')

      # 然后连接打印机将其打印出来即可
      is_ok =[]
      if type == 'box':
        for i in range(4):
          temp = print_img('./code.png')
          is_ok.append(temp)
      else:
        temp = print_img('./code.png')
        is_ok.append(temp)
      # is_ok = True
      result['done'] = 'ok' if np.all(is_ok) else '连接打印机失败'
    except Exception as e:
      result['done'] = e

    return JsonResponse(result)
 
 def print_img(img):
  import win32print
  import win32ui
  from PIL import Image, ImageWin
  # 参考 http://timgolden.me.uk/python/win32_how_do_i/print.html#win32print
  try:
    printer_name = win32print.GetDefaultPrinter()
    hDC = win32ui.CreateDC()
    hDC.CreatePrinterDC(printer_name)

    #printable_area = (300, 270) # 打印纸尺寸
    #printer_size = (300, 270)

    # 打开图片并缩放
    bmp = Image.open(img)
    if bmp.size[0] < bmp.size[1]:
      bmp = bmp.rotate(90)

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

    hDC.StartDoc(img)
    hDC.StartPage()

    dib = ImageWin.Dib(bmp)
    scaled_width, scaled_height = [int(scale * i) for i in bmp.size]

    x1 = 20 # 控制位置
    y1 = -30
    x2 = x1 + scaled_width
    y2 = y1 + scaled_height
    dib.draw(hDC.GetHandleOutput(), (x1, y1, x2, y2))

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

    return True
  except:
    return False