搜索PDF文本，在获取坐标后通过绘制矩形突出显示找到的单词保存PDF并突出显示文本 [英] search PDF text, highlight found words by drawing rectangle after getting their coordinates save PDF with text highlighted
问题描述
任何人都可以提供如何获取文本坐标的帮助？这有可能吗？因为我只想要一个Windows窗体应用程序，用户在文本框中键入一个单词，应用程序使用iTextSharp读取现有PDF，突出显示匹配的单词（如果找到），并使用突出显示的文本保存PDF。到目前为止我几乎已经完成了所有工作，包括绘制黄色矩形，但缺少的是如何获取匹配模式的文本坐标以突出显示它们，提前感谢:(顺便说一句：sb是搜索文本框，tb是一个富文本框，其中展示了PDF文本）
Anyone can help with how to get a text coordinates? can this be possible? because I just wanted a windows form app where the user types a word in a text box, and the app reads existing PDF using iTextSharp, highlights the matched words if found, and saves the PDF with highlighted text. so far i have almost everything done, including the drawing of a yellow rectangle, but what is lacking is how to get the text coordinates of the matched patterns to highlight them, thanks in advance: (by the way: sb is the search text box, tb is a rich text box where the PDF text is exhibited)
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.IO;
using iTextSharp.text.pdf;
using iTextSharp.text.pdf.parser;
using iTextSharp.text;
using System.Text.RegularExpressions;
namespace manipulatePDF
{
public partial class Form1 : Form
{
string oldFile;
Document document = new Document();
StringBuilder text = new StringBuilder();
public Form1()
{
InitializeComponent();
}
private void open_Click(object sender, EventArgs e)
{
reset_Click(sender, e);
openFileDialog1.Filter = "PDF Files (.pdf)|*.pdf";
openFileDialog1.FilterIndex = 1;
if (openFileDialog1.ShowDialog() == System.Windows.Forms.DialogResult.OK)
{
label1.Text = "File Location: " + openFileDialog1.FileName;
oldFile = openFileDialog1.FileName;
// open the reader
PdfReader reader = new PdfReader(oldFile);
iTextSharp.text.Rectangle size = reader.GetPageSizeWithRotation(1);
document.SetPageSize(size);
for (int cPage = 1; cPage <= reader.NumberOfPages; cPage++)
{
ITextExtractionStrategy strategy = new SimpleTextExtractionStrategy();
string currentText = PdfTextExtractor.GetTextFromPage(reader, cPage, strategy);
currentText = Encoding.UTF8.GetString(ASCIIEncoding.Convert(Encoding.Default, Encoding.UTF8, Encoding.Default.GetBytes(currentText)));
text.Append(currentText);
reader.Close();
}
tb.Text = text.ToString();
}
}
private void save_Click(object sender, EventArgs e)
{
saveFileDialog1.InitialDirectory = "C: ";
saveFileDialog1.Title = "Save the PDF File";
saveFileDialog1.Filter = "PDF files (*.pdf)|*.pdf";
if (saveFileDialog1.ShowDialog() == System.Windows.Forms.DialogResult.OK)
{
PdfReader reader = new PdfReader(oldFile);
string newFile = saveFileDialog1.FileName;
// open the writer
FileStream fs = new FileStream(newFile, FileMode.Create, FileAccess.Write);
PdfWriter writer = PdfWriter.GetInstance(document, fs);
document.Open();
// the pdf content
PdfContentByte cb = writer.DirectContent;
// select the font properties
PdfGState graphicsState = new PdfGState();
graphicsState.FillOpacity = 10;
cb.SetGState(graphicsState);
int index = 0;
while (index < text.ToString().LastIndexOf(sb.Text))
{
if (contain.Checked == true)
{
tb.Find(sb.Text, index, tb.TextLength, RichTextBoxFinds.MatchCase);
tb.SelectionBackColor = Color.Gold;
index = tb.Text.IndexOf(sb.Text, index) + 1;
}
else if (exact.Checked == true)
{
tb.Find(sb.Text, index, tb.TextLength, RichTextBoxFinds.WholeWord);
tb.SelectionBackColor = Color.Gold;
index = tb.Text.IndexOf(sb.Text, index) + 1;
}
}
int count = 0; //counts the pattern occurance
for (int cPage = 1; cPage <= reader.NumberOfPages; cPage++)
{
ITextExtractionStrategy strategy = new SimpleTextExtractionStrategy();
string currentText = PdfTextExtractor.GetTextFromPage(reader, cPage, strategy);
currentText = Encoding.UTF8.GetString(ASCIIEncoding.Convert(Encoding.Default, Encoding.UTF8, Encoding.Default.GetBytes(currentText)));
string textToSearch = sb.Text;
int lastStartIndex = currentText.IndexOf(textToSearch, 0, StringComparison.CurrentCulture);
while (lastStartIndex != -1)//if the pattern was found
{
count++;
lastStartIndex = currentText.IndexOf(textToSearch, lastStartIndex + 1, StringComparison.CurrentCulture);
BaseFont bf = BaseFont.CreateFont(BaseFont.HELVETICA, BaseFont.CP1252, BaseFont.NOT_EMBEDDED);
cb.SetFontAndSize(bf, 10);
cb.SetColorFill(new CMYKColor(0f, 0f, 1f, 0f));
cb.Rectangle(document.PageSize.Width - 500f, 600f, 100f, 100f);
cb.Fill();
}
if (count != 0)
{
if (contain.Checked == true)
{
label2.Text = "Number of pages: " + cPage + " - " + textToSearch + " found " + count + " times. \n";
}
else if (exact.Checked == true)
{
//finds the words that are bounded by a space or a dot and store in cCount
//returns the count of matched pattern = count - cCount
}
}
text.Append(currentText);
// create the new page and add it to the pdf
PdfImportedPage page = writer.GetImportedPage(reader, cPage);
cb.AddTemplate(page, 0, 0);
document.NewPage();
//PdfStamper stamper = new PdfStamper(reader, fs);
////Create a rectangle for the highlight. NOTE: Technically this isn't used but it helps with the quadpoint calculation
//iTextSharp.text.Rectangle rect = new iTextSharp.text.Rectangle(60.6755f, 749.172f, 94.0195f, 735.3f);
////Create an array of quad points based on that rectangle. NOTE: The order below doesn't appear to match the actual spec but is what Acrobat produces
//float[] quad = { rect.Left, rect.Bottom, rect.Right, rect.Bottom, rect.Left, rect.Top, rect.Right, rect.Top };
////Create our hightlight
//PdfAnnotation highlight = PdfAnnotation.CreateMarkup(stamper.Writer, rect, null, PdfAnnotation.MARKUP_HIGHLIGHT, quad);
////Set the color
//highlight.Color = BaseColor.YELLOW;
////Add the annotation
//stamper.AddAnnotation(highlight, 1);
}
// close the streams
document.Close();
fs.Close();
writer.Close();
reader.Close();
}
}
private void reset_Click(object sender, EventArgs e)
{
tb.Text = "";
}
}
推荐答案
好，我添加了一个使用Vb.NET 2010制作的可下载的示例，它完全符合您的需要，并且可以在Chris引用的同一个帖子中的另一篇文章中找到它。该代码适用于每种字体类型，字体大小，并将返回您搜索的单词/句子的所有匹配项，将每个匹配项返回为具有x / y位置的矩形到UI，最后高亮显示它们并保存到新的PDF，您只需要提供一些初始参数，如搜索词，文化比较类型，源PDF路径和目标PDF路径。唯一没有实现的是搜索词/句子分成多行的特殊情况，但它应该是代码中的一个简单更改，因为你可以在TextChunk类中使用SameLine（）方法。
Well, i had added a downloable example made using Vb.NET 2010 that does exactly what you need, and it's available in another post in the same thread Chris referenced. That code will work for every font type, font size and will return all matches for the word/sentence you search for, returning each match as a rectangle with x/y locations to the UI, and finally hightlighting them all and saving to a new PDF, you just need to give some initial parameters like, search term, comparison type by culture, source PDF path and destination PDF Path. The only thing not implemented is that particular case when the search word/sentence falls into multiple lines, but it should be an easy change in code since you can use SameLine() method in TextChunk Class.
这篇关于搜索PDF文本，在获取坐标后通过绘制矩形突出显示找到的单词保存PDF并突出显示文本的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
