【python】云打印实现

冷不防 2023-09-23 15:06 208阅读 0赞

> 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][python_-]**，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

![在这里插入图片描述][9f4b05c757f84f818881c8a66b4e4cd6.png]  
![在这里插入图片描述][54df65e33d3e4a0982f06c956cbf7864.png]  
![在这里插入图片描述][89ee74663b9e4378bcebc8df6a4e9436.png]

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）

[python_-]: https://wuyuchang.com/?p=331
[9f4b05c757f84f818881c8a66b4e4cd6.png]: https://img-blog.csdnimg.cn/9f4b05c757f84f818881c8a66b4e4cd6.png
[54df65e33d3e4a0982f06c956cbf7864.png]: https://img-blog.csdnimg.cn/54df65e33d3e4a0982f06c956cbf7864.png
[89ee74663b9e4378bcebc8df6a4e9436.png]: https://img-blog.csdnimg.cn/89ee74663b9e4378bcebc8df6a4e9436.png