我怎么能得到与iTextSharp的文本格式

我正在使用iTextSharp从PDF读取文本内容。 我也可以阅读。 但我失去了文字格式，如字体，颜色等有什么办法来获得格式化。

下面是我用来确切的文字的代码段 –

PdfReader reader = new PdfReader("F:\\EBooks\\AspectsOfAjax.pdf"); textBox1.Text = ExtractTextFromPDFBytes(reader.GetPageContent(1)); private string ExtractTextFromPDFBytes(byte[] input) { if (input == null || input.Length == 0) return ""; try { string resultString = ""; // Flag showing if we are we currently inside a text object bool inTextObject = false; // Flag showing if the next character is literal eg '\\' to get a '\' character or '\(' to get '(' bool nextLiteral = false; // () Bracket nesting level. Text appears inside () int bracketDepth = 0; // Keep previous chars to get extract numbers etc.: char[] previousCharacters = new char[_numberOfCharsToKeep]; for (int j = 0; j < _numberOfCharsToKeep; j++) previousCharacters[j] = ' '; for (int i = 0; i < input.Length; i++) { char c = (char)input[i]; if (inTextObject) { // Position the text if (bracketDepth == 0) { if (CheckToken(new string[] { "TD", "Td" }, previousCharacters)) { resultString += "\n\r"; } else { if (CheckToken(new string[] {"'", "T*", "\""}, previousCharacters)) { resultString += "\n"; } else { if (CheckToken(new string[] { "Tj" }, previousCharacters)) { resultString += " "; } } } } // End of a text object, also go to a new line. if (bracketDepth == 0 && CheckToken( new string[]{"ET"}, previousCharacters)) { inTextObject = false; resultString += " "; } else { // Start outputting text if ((c == '(') && (bracketDepth == 0) && (!nextLiteral)) { bracketDepth = 1; } else { // Stop outputting text if ((c == ')') && (bracketDepth == 1) && (!nextLiteral)) { bracketDepth = 0; } else { // Just a normal text character: if (bracketDepth == 1) { // Only print out next character no matter what. // Do not interpret. if (c == '\\' && !nextLiteral) { nextLiteral = true; } else { if (((c >= ' ') && (c <= '~')) || ((c >= 128) && (c < 255))) { resultString += c.ToString(); } nextLiteral = false; } } } } } } // Store the recent characters for when we have to go back for a checking for (int j = 0; j < _numberOfCharsToKeep - 1; j++) { previousCharacters[j] = previousCharacters[j + 1]; } previousCharacters[_numberOfCharsToKeep - 1] = c; // Start of a text object if (!inTextObject && CheckToken(new string[]{"BT"}, previousCharacters)) { inTextObject = true; } } return resultString; } catch { return ""; } } private bool CheckToken(string[] tokens, char[] recent) { foreach(string token in tokens) { if ((recent[_numberOfCharsToKeep - 3] == token[0]) && (recent[_numberOfCharsToKeep - 2] == token[1]) && ((recent[_numberOfCharsToKeep - 1] == ' ') || (recent[_numberOfCharsToKeep - 1] == 0x0d) || (recent[_numberOfCharsToKeep - 1] == 0x0a)) && ((recent[_numberOfCharsToKeep - 4] == ' ') || (recent[_numberOfCharsToKeep - 4] == 0x0d) || (recent[_numberOfCharsToKeep - 4] == 0x0a)) ) { return true; } } return false; } 

Answer 1

让我试着以不同的方向指引你。 iTextSharp有一个非常漂亮和简单的文本提取系统，可以处理一些基本的令牌。 不幸的是，它不处理颜色信息，但根据@Mark Storer，实现自己可能并不难 。

开始编辑

我开始着手实施颜色信息。 在这里看到我的博客文章了解更多详情。 （对不起格式不好，现在就去吃晚饭吧。）

结束编辑

下面的代码结合了几个问题和答案，其中包括这个获得字体高度 （尽pipe它不是确切的）以及另一个（对于我的生活，我似乎再也找不到了），显示如何检测大胆的。

PostscriptFontName在字体名称前面返回一些额外的字符，我认为它与embedded字体子集有关。

下面是一个完整的WinForms应用程序，其目标是iTextSharp 5.1.1.0，并将文本解压缩为HTML。

示例PDF的屏幕截图

示例文本提取为HTML

 <span style="font-family:NJNSWD+Papyrus-Regular;font-size:11.61407">Hello </span> <span style="font-family:NJNSWD+Papyrus-Regular-Bold;font-size:11.61407">w</span> <span style="font-family:NJNSWD+Papyrus-Regular-Bold;font-size:37.87201">o</span> <span style="font-family:NJNSWD+Papyrus-Regular-Bold;font-size:11.61407">rl</span> <span style="font-family:NJNSWD+Papyrus-Regular;font-size:11.61407">d </span> <br /> <span style="font-family:NJNSWD+Papyrus-Regular;font-size:11.61407">Test </span> 

码

 using System; using System.Collections.Generic; using System.Text; using System.Windows.Forms; using iTextSharp.text.pdf.parser; using iTextSharp.text.pdf; namespace WindowsFormsApplication2 { public partial class Form1 : Form { public Form1() { InitializeComponent(); } private void Form1_Load(object sender, EventArgs e) { PdfReader reader = new PdfReader(System.IO.Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.Desktop), "Document.pdf")); TextWithFontExtractionStategy S = new TextWithFontExtractionStategy(); string F = iTextSharp.text.pdf.parser.PdfTextExtractor.GetTextFromPage(reader, 1, S); Console.WriteLine(F); this.Close(); } public class TextWithFontExtractionStategy : iTextSharp.text.pdf.parser.ITextExtractionStrategy { //HTML buffer private StringBuilder result = new StringBuilder(); //Store last used properties private Vector lastBaseLine; private string lastFont; private float lastFontSize; //http://api.itextpdf.com/itext/com/itextpdf/text/pdf/parser/TextRenderInfo.html private enum TextRenderMode { FillText = 0, StrokeText = 1, FillThenStrokeText = 2, Invisible = 3, FillTextAndAddToPathForClipping = 4, StrokeTextAndAddToPathForClipping = 5, FillThenStrokeTextAndAddToPathForClipping = 6, AddTextToPaddForClipping = 7 } public void RenderText(iTextSharp.text.pdf.parser.TextRenderInfo renderInfo) { string curFont = renderInfo.GetFont().PostscriptFontName; //Check if faux bold is used if ((renderInfo.GetTextRenderMode() == (int)TextRenderMode.FillThenStrokeText)) { curFont += "-Bold"; } //This code assumes that if the baseline changes then we're on a newline Vector curBaseline = renderInfo.GetBaseline().GetStartPoint(); Vector topRight = renderInfo.GetAscentLine().GetEndPoint(); iTextSharp.text.Rectangle rect = new iTextSharp.text.Rectangle(curBaseline[Vector.I1], curBaseline[Vector.I2], topRight[Vector.I1], topRight[Vector.I2]); Single curFontSize = rect.Height; //See if something has changed, either the baseline, the font or the font size if ((this.lastBaseLine == null) || (curBaseline[Vector.I2] != lastBaseLine[Vector.I2]) || (curFontSize != lastFontSize) || (curFont != lastFont)) { //if we've put down at least one span tag close it if ((this.lastBaseLine != null)) { this.result.AppendLine("</span>"); } //If the baseline has changed then insert a line break if ((this.lastBaseLine != null) && curBaseline[Vector.I2] != lastBaseLine[Vector.I2]) { this.result.AppendLine("<br />"); } //Create an HTML tag with appropriate styles this.result.AppendFormat("<span style=\"font-family:{0};font-size:{1}\">", curFont, curFontSize); } //Append the current text this.result.Append(renderInfo.GetText()); //Set currently used properties this.lastBaseLine = curBaseline; this.lastFontSize = curFontSize; this.lastFont = curFont; } public string GetResultantText() { //If we wrote anything then we'll always have a missing closing tag so close it here if (result.Length > 0) { result.Append("</span>"); } return result.ToString(); } //Not needed public void BeginTextBlock() { } public void EndTextBlock() { } public void RenderImage(ImageRenderInfo renderInfo) { } } } }