重庆分公司,新征程启航
为企业提供网站建设、域名注册、服务器等服务
这篇文章主要介绍python连接打印机如何实现打印文档、图片、pdf文件等功能,文中介绍的非常详细,具有一定的参考价值,感兴趣的小伙伴们一定要看完!
唐山ssl适用于网站、小程序/APP、API接口等需要进行数据传输应用场景,ssl证书未来市场广阔!成为创新互联公司的ssl证书销售渠道,可以享受市场价格4-6折优惠!如果有意向欢迎电话联系或者加微信:13518219792(备注:SSL证书合作)期待与您的合作!引言
python连接打印机进行打印,可能根据需求的不同,使用不同的函数模块。
如果你只是简单的想打印文档,比如office文档,你可以使用ShellExecute
方法,对于微软office的文档、pdf、txt等有用,你可以尝试下;
如果你输入某些数据,文字信息,就想直接把它发送给打印机打印,那么可以尝试使用win32print;
如果你有一张图片,那么你可以结合python的Python Imaging Library(PIL)
和win32ui
模块进行打印;
普通打印
ShellExecute
首先确保你电脑中的应用可以打开你要打印的文件;
是一些标准的文件类型
不用管哪些打印机,也就是说和连接的打印机型号无关;
你无控制设置打印属性的权限;
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 )
另一个版本
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 )
直接打印数据
win32print
直接将数据扔给打印机;
快速而且容易;
而且可以定义选择哪个打印机打印;
但是要打印的数据必须是可打印的,例如字符串等;
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)
打印图片
PIL win32ui
不使用额外的工具,在windows电脑上打印一张图片是相当的困难,至少需要3种不同的且相关的设备环境才可以。
还好,device-independent bitmap(DIB)和PIL可以帮助我们快速打印。下面的代码可以将图片发送至打印机打印尽可能大的尺寸且不失比例。
还可以选择使用哪个打印机
选择加载的图片的格式等
但是如果你电脑不是windows,那可能不是最好的方法;
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 ()
实践
从前台传来要打印的字符,后端生成二维码,并作出相应处理后,连接打印机打印图片。
# 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
打印效果:
以上是“python连接打印机如何实现打印文档、图片、pdf文件等功能”这篇文章的所有内容,感谢各位的阅读!希望分享的内容对大家有帮助,更多相关知识,欢迎关注创新互联成都网站设计公司行业资讯频道!
另外有需要云服务器可以了解下创新互联scvps.cn,海内外云服务器15元起步,三天无理由+7*72小时售后在线,公司持有idc许可证,提供“云服务器、裸金属服务器、高防服务器、香港服务器、美国服务器、虚拟主机、免备案服务器”等云主机租用服务以及企业上云的综合解决方案,具有“安全稳定、简单易用、服务可用性高、性价比高”等特点与优势,专为企业上云打造定制,能够满足用户丰富、多元化的应用场景需求。