生成PDF字節數組

我有這樣一個靜態方法，我使用iTextSharp的生成PDF ..生成PDF字節數組

public static byte[] createPDF(string htmlstr) { 
      var html = @"<?xml version=""1.0"" encoding=""UTF-8""?> 
      <!DOCTYPE html 
       PUBLIC ""-//W3C//DTD XHTML 1.0 Strict//EN"" 
       ""http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd""> 
      <html xmlns=""http://www.w3.org/1999/xhtml"" xml:lang=""en"" lang=""en""> 
       <head> 
        <title>Minimal XHTML 1.0 Document with W3C DTD</title> 
       </head> 
       <body> 
       " + htmlstr + "</body></html>"; 

      // step 1: creation of a document-object 
      Document document = new Document(PageSize.A4, 30, 30, 30, 30); 

      MemoryStream msOutput = new MemoryStream(); 

      // step 2: 
      // we create a writer that listens to the document 
      // and directs a XML-stream to a file 
      PdfWriter.GetInstance(document, msOutput); 

      // step 3: we create a worker parse the document 
      HTMLWorker worker = new HTMLWorker(document); 

      // step 4: we open document and start the worker on the document 
      document.Open(); 
      worker.StartDocument(); 

      // step 5: parse the html into the document 
      worker.Parse(new StringReader(html)); 

      // step 6: close the document and the worker 
      worker.EndDocument(); 
      worker.Close(); 
      document.Close(); 

      byte[] buffer = new byte[msOutput.Length]; 

      using (MemoryStream ms = new MemoryStream()) 
      { 
       int read; 
       while ((read = msOutput.Read(buffer, 0, buffer.Length)) > 0) 
       { 
        ms.Write(buffer, 0, read); 
       } 

       msOutput.Close(); 

       return ms.ToArray(); 
      } 
    }

當我調試，我通過worker.Parse(new StringReader(html))之後，MemoryStream.Length不起作用。

我看過一些使用FileStream的例子，但我不想創建一個新文件。爲什麼代碼錯誤？

來源

2014-01-30 shress1

您遇到的基本問題是，默認情況下，PdfWriter對象將關閉您正在寫入的流。 PdfWriter.GetInstance()實際返回一個對象，你可以設置附加屬性和你特別想打電話：

writer.CloseStream = false;

你MemoryStream到byte[]到MemoryStream到byte[]混淆了我，在那短短的方式來嘗試解決上述問題？

與iTextSharp的5.0.6開始大部分的初級班，如Document和PdfWriter的都實現IDisposable其中，至少對我來說，沿着using模式使代碼更容易閱讀和調試。你也不必考慮關閉事物。給這個鏡頭：

public static byte[] createPDF(string htmlstr) { 
    var html = @"<?xml version=""1.0"" encoding=""UTF-8""?> 
    <!DOCTYPE html 
     PUBLIC ""-//W3C//DTD XHTML 1.0 Strict//EN"" 
     ""http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd""> 
    <html xmlns=""http://www.w3.org/1999/xhtml"" xml:lang=""en"" lang=""en""> 
     <head> 
      <title>Minimal XHTML 1.0 Document with W3C DTD</title> 
     </head> 
     <body> 
     " + htmlstr + "</body></html>"; 


    // step 1: creation of a document-object 
    using (Document document = new Document(PageSize.A4, 30, 30, 30, 30)) { 
     using (MemoryStream msOutput = new MemoryStream()) { 

      // step 2: 
      // we create a writer that listens to the document 
      // and directs a XML-stream to a file 
      using (PdfWriter writer = PdfWriter.GetInstance(document, msOutput)) { 

       // step 3: we create a worker parse the document 
       HTMLWorker worker = new HTMLWorker(document); 

       // step 4: we open document and start the worker on the document 
       document.Open(); 
       worker.StartDocument(); 


       // step 5: parse the html into the document 
       worker.Parse(new StringReader(html)); 

       // step 6: close the document and the worker 
       worker.EndDocument(); 
       worker.Close(); 
       document.Close(); 
      } 

      // Return the bytes 
      return msOutput.ToArray(); 
     } 
    } 
}

來源

2014-01-31 14:16:35

謝謝克里斯。我看到我最初做錯了，你的解決方案也有所幫助。我想再次提一次我的問題。我遇到了一個itextsharp問題，它不支持style =「display：none」css，我已經遍佈了我想要從中生成PDF的HTML。有沒有辦法在生成PDF時隱藏HTML中的一些元素？任何幫助將不勝感激。 – shress1

生成PDF字節數組

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