使用SWIFT进行PDF解析 [英] PDF Parsing with SWIFT

问题描述

我想解析一个没有图像，只有文本的PDF.我正在尝试查找文本片段.例如，搜索字符串名称:"，并能够读取:"之后的字符.

I want to parse a PDF that has no images, only text. I'm trying to find pieces of text. For example to search the string "Name:" and be able to read the characters after ":".

我已经能够打开PDF，获取页数并在其上循环播放.问题是当我想使用像CGPDFDictionaryGetStream或CGPDFStreamCopyData这样的函数时，因为它们使用指针.我没有在互联网上找到许多迅速的程序员的信息.

I'm already able to open a PDF, get the number of pages, and to loop on them. The problem is when I want to use functions like CGPDFDictionaryGetStream or CGPDFStreamCopyData, because they use pointers. I have not found much info on the internet for swift programmers.

也许最简单的方法是将所有内容解析为NSString.然后我可以做剩下的事.

Maybe the easiest way would be to parse all the content to an NSString. Then I could do the rest.

这是我的代码:

// Get existing Pdf reference
let pdf = CGPDFDocumentCreateWithURL(NSURL(fileURLWithPath: path))
let pageCount = CGPDFDocumentGetNumberOfPages(pdf);
for index in 1...pageCount {
    let myPage = CGPDFDocumentGetPage(pdf, index)
    //Search somehow the string "Name:" to get whats written next
}

推荐答案

您可以使用 PDFKit 为此.它是Quartz框架的一部分，可在iOS和MacOS上使用.它的速度也相当快，我仅用0.07秒就可以搜索包含15000多个字符的PDF.

You can use PDFKit to do this. It is part of the Quartz framework and is available on both iOS and MacOS. It is also pretty fast, I was able to search through a PDF with over 15000 characters in just 0.07s.

这里是一个例子:

import Quartz

let pdf = PDFDocument(url: URL(fileURLWithPath: "/Users/...some path.../test.pdf"))

guard let contents = pdf?.string else {
    print("could not get string from pdf: \(String(describing: pdf))")
    exit(1)
}

let footNote = contents.components(separatedBy: "FOOT NOTE: ")[1] // get all the text after the first foot note

print(footNote.components(separatedBy: "\n")[0]) // print the first line of that text

// Output: "The operating system being written in C resulted in a more portable software."

您仍然可以访问以前拥有的大多数(如果不是全部)属性.例如pdf.pageCount表示页面数，而pdf.page(at: <Int>)表示获取特定页面.

You can also still access most of (if not all of) the properties you had before. Such as pdf.pageCount for the number of pages, and pdf.page(at: <Int>) to get a specific page.

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