这两天为了实现云打印功能找了很多相关的文章

记录一下这一篇，python云打印实现-朝花夕拾，代码通过监听文件夹有无产生新文件来判断是否执行，我尝试运行了下没问题，于是打算转载一下

程序运行结果

由于对方的代码和我实现的有点出入但都是先下载，后打印，只不过我的实通过mqtt服务器罢了，于是通过一步一步解析，我发现他这里有几个需要注意的，给大家和自己才个坑

1、settings.json 配置打印机和监控文件夹
2、不支持图片和pdf打印，有点难弄，后面处理了我会附上
3、不支持彩彩印规格这些
4、打印机用默认的即可，配置没多大作用，因为最后参数没有传过去

我改良后的

import timeimport win32api
import win32print
from watchdog.observers import Observer
from watchdog.events import *
import json
import sys
import traceback
import osdef printer_loading(filename, printer):win32api.ShellExecute(0,"print",filename,'/d:"%s"' % win32print.GetDefaultPrinter(),".",0)
'''
def printer_pic(pic_path, printer_name):# 物理宽度、高度PHYSICALWIDTH = 110PHYSICALHEIGHT = 111# 物理偏移位置PHYSICALOFFSETX = 112PHYSICALOFFSETY = 113printer_name = win32print.GetDefaultPrinter()hDC = win32ui.CreateDC()hDC.CreatePrinterDC(printer_name)printer_size = hDC.GetDeviceCaps(PHYSICALWIDTH), hDC.GetDeviceCaps(PHYSICALHEIGHT)# printer_margins = hDC.GetDeviceCaps (PHYSICALOFFSETX), hDC.GetDeviceCaps (PHYSICALOFFSETY)# 打开图片# ＃通过每个像素使它尽可能大# ＃页面不失真。bmp = Image.open(file_name)ratios = [1.0 * 1754 / bmp.size[0], 1.0 * 1240 / bmp.size[1]]scale = min(ratios)# ＃开始打印作业，并将位图绘制到# ＃按比例缩放打印机设备。hDC.StartDoc(file_name)hDC.StartPage()dib = ImageWin.Dib(bmp)scaled_width, scaled_height = [int(scale * i) for i in bmp.size]print(scaled_width, scaled_height)x1 = int((printer_size[0] - scaled_width) / 2)y1 = int((printer_size[1] - scaled_height) / 2)# 横向位置坐标x1 = 1580# 竖向位置坐标y1 = 30# 4倍为自适应图片实际尺寸打印x2 = x1 + bmp.size[0] * 4y2 = y1 + bmp.size[1] * 4dib.draw(hDC.GetHandleOutput(), (x1, y1, x2, y2))hDC.EndPage()hDC.EndDoc()hDC.DeleteDC()
'''
class FileEventHandler(FileSystemEventHandler):def __init__(self,printer):FileSystemEventHandler.__init__(self)self.printer = printerdef on_created(self, event):print(event.is_directory)if event.is_directory:print("directory created:{0}".format(event.src_path))else:print("file created:{0}".format(event.src_path))if event.src_path.endswith("docx") or event.src_path.endswith("doc") or event.src_path.endswith("xlsx") or event.src_path.endswith("jpg") or event.src_path.endswith("pdf") or event.src_path.endswith("xls") or event.src_path.endswith("txt") or event.src_path.endswith("img"):if "~" not in event.src_path:print(f"打印路径{event.src_path}")print(f"打印机名字{self.printer}")printer_loading(event.src_path, self.printer)# import time
# win32api.ShellExecute(0, 'open', 'C:\\Program Files (x86)\\Allway Sync\\Bin\\syncappw.exe', '','',1)if __name__ == "__main__":try:observers = []print("当前检测到的打印机:")maxL = 2Num = 2for i in range(1, 10):# print(i)r = win32print.EnumPrinters(i)l = len(r)if l > maxL:maxL = lNum = ifor i, p in enumerate(list(win32print.EnumPrinters(Num))):print(f"\t{i}:{p[1]}\n")# f = open('.ttings.txt', 'r', encoding="utf-8")settings = {}# print("当前配置:")# for line in f.readlines():#     k, v = line.split(",")#     settings[k.strip()] = v.strip()#     print(f"\t{k}:{v}")print("当前配置:")with open("./settings.json", 'rb') as load_f:ds = json.load(load_f)for d in ds:settings[d['url'].strip()] = d["printer"].strip()print(f"\t{d}")passfor path, printer in settings.items():observer = Observer()print("打印机名"+printer)event_handler = FileEventHandler(printer)observer.schedule(event_handler, path, True)observer.start()observers.append(observer)try:while True:time.sleep(1)except KeyboardInterrupt:for observer in observers:observer.stop()for observer in observers:observer.join()except Exception as e:print(e)traceback.print_exc()input()

完整代码在这里：xxxxx

我顺藤摸瓜发现我们启动的方法不一样，我的是通过

 w = DispatchEx('kwps.Application')w.Visible = 0  # 不打开软件w.DisplayAlerts = 0  # 不报错
doc = w.Documents.Open(f)

而他的核心代码是通过

 # 打印输出def printer_loading(filename, printer):win32api.ShellExecute(0,"print",filename,'/d:"%s"' % win32print.GetDefaultPrinter(),".",0)# 打印

暂时只知道第一个代码需要安装wps，第二个未测试

client_mqtt版（需要配合mqtt数据使用，不建议下载，自己用，需要安装wps-珠海zf版本）

client_mqtt_plus（需要配合mqtt数据使用，不建议下载，自己用，需要安装wps-珠海zf版本）

朝花夕拾-改良版（可以下载）