【python】云打印实现

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 time

import win32api
import win32print
from watchdog.observers import Observer
from watchdog.events import *
import json
import sys
import traceback
import os


def 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 = 110
    PHYSICALHEIGHT = 111
    # 物理偏移位置
    PHYSICALOFFSETX = 112
    PHYSICALOFFSETY = 113
    printer_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] * 4
    y2 = y1 + bmp.size[1] * 4
    dib.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 = printer

    def 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 = 2
        Num = 2
        for i in range(1, 10):
            # print(i)
            r = win32print.EnumPrinters(i)
            l = len(r)
            if l > maxL:
                maxL = l
                Num = i

        for 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}")
        pass
        for 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）