使用Flutter打印程序包时，如何从URL打印PDF? [英] With flutter printing package, how do I print a PDF from a URL?

问题描述

我正在快速使用打印软件包: https://pub.dev/packages/printing

I am using the printing package in flutter: https://pub.dev/packages/printing

文档显示了如何从头开始创建PDF.我已经有一个URL的PDF.有没有办法找回它并与包装一起打印?还是在另一个软件包中有替代方法?

The documentation shows how to create PDFs from scratch. I already have a PDF at a URL. Is there a way to retrieve it and print it with the package? Or is there an alternate method with another package?

推荐答案

我尝试了以下方法来实现打印功能:

I have tried the following ways to achieve the printing feature:

• 直接获取远程数据字节
  使用流行的软件包印刷

var data = await http.get(url);
await Printing.layoutPdf(onLayout: (_) => data.bodyBytes);

但是我发现这种方法在打印卷筒纸(POS打印机)时会出现打印区域混乱的问题

But I found that this way will have the printing area disorder issue when printing a roller size paper (POS printer)

• 共享(第一个替代)
  使用sharePdf函数

var data = await http.get(url);
await Printing.sharePdf(bytes: data.bodyBytes, filename: 'my-document.pdf');

此步骤需要执行其他打印步骤(点击浏览器的功能"图标然后打印)

This one needs an additional step to print (click the 'functions' icon of browser then print)

• 从浏览器中查看并本地打印
  签出此软件包 url_launcher

import 'package:url_launcher/url_launcher.dart';

if (await canLaunch(url)) {
  await launch(url);
}

此步骤需要执行其他打印步骤(点击浏览器的功能"图标然后打印)

This one needs an additional step to print (click the 'functions' icon of browser then print)

• 下载远程文件并保存，使用flutter_pdf_printer软件包.
  使用此软件包 flutter_pdf_printer 和路径提供程序

var data = await http.get(url);
final output = await getTemporaryDirectory();
final file = File('${output.path}/your_file_name_${new DateTime.now().microsecondsSinceEpoch}.pdf');
await file.writeAsBytes(data.bodyBytes);
await FlutterPdfPrinter.printFile(file.path);

***该软件包将具有频道注册人问题，请在安装后运行 flutter clean ***
这个包装有些过时了，但是它对我来说可以用80尺寸的pdf滚轴打印.它使用Swift UIKit软件包，该软件包具有良好的兼容性.

*** this package will have channel registrant issue, please run flutter clean after installation ***
This package is a little bit outdated, but it works for me to print with a roller 80 size pdf. It uses the Swift UIKit package, which has good compatibility.

我的方案是打印高度无限的80尺寸的pdf滚轴，该打印包不适用于cuz，因为它无法正确预览pdf.因此，我改变了最后一种打印方式，这种方式对我来说很有效.如果仅打印A4或常规尺寸的PDF，则打印包仍然是不错的选择.

My scenario is to print a roller 80 size pdf with infinite height, the printing package doesn't work for cuz it cannot preview the pdf properly. So I changed to the last way to print, which works for me. If you just print an A4 or a regular size PDF, the printing package is still a good choice.

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