[英]XMLWorker Exception : Object reference not set to an instance of an object
我想將html導出為pdf
var document = new Document();
PdfWriter pdfWriter = PdfWriter.GetInstance(document,
new FileStream("/my.pdf", FileMode.Create));
pdfWriter.SetFullCompression();
pdfWriter.StrictImageSequence = true;
pdfWriter.SetLinearPageMode();
var sr = new StringReader(htmlcode);
document.Open();
var k = XMLWorkerHelper.GetInstance();
k.ParseXHtml(pdfWriter, document, sr);
//here it gave me an exception: Object reference not set to an instance of
an object
sr.Close();
document.Close();
Response.ContentType = "Application/pdf";
Response.AppendHeader("Content-Disposition", "attachment; filename="my.pdf");
Response.TransmitFile(@"c:\test\my.pdf");
Response.Flush();
Response.End();
Response.Close();
所有例外:
System.NullReferenceException: Object reference not set to an
instance of an object.
at iTextSharp.tool.xml.pipeline.html.HtmlPipeline.Close
(IWorkerContext context, Tag t, ProcessObject po)
at iTextSharp.tool.xml.XMLWorker.EndElement(String tag, String ns)
at iTextSharp.tool.xml.parser.XMLParser.EndElement()
at iTextSharp.tool.xml.parser.state.ClosingTagState.Process(Char character)
at iTextSharp.tool.xml.parser.XMLParser.ParseWithReader(TextReader reader)
at iTextSharp.tool.xml.XMLWorkerHelper.ParseXHtml(PdfWriter writer,
Document doc, TextReader inp)
這一行出錯
var k = XMLWorkerHelper.GetInstance();
k.ParseXHtml(pdfWriter, document, sr);
//這里它給了我一個例外:對象引用未設置為對象的實例
由於任何一個輸入參數的值指向NULL我們可以在傳遞之前檢查它(變量將通過)是否為null或值。
以下代碼足以獲取HTML內容並將其寫入PDF文件
Document pdfDoc = new Document(PageSize.A4, 10, 10, 10, 10);
PdfWriter writer = PdfWriter.GetInstance(pdfDoc, new FileStream(@"D:\Syed\New PDF\PDF.pdf", FileMode.Create));// Output PDF File Path
Response.Write("File Created Successfully");
pdfDoc.Open();
XMLWorkerHelper.GetInstance().ParseXHtml(writer, pdfDoc, new StreamReader(@"D:\Syed\test.html"));//This is input HTML file path
pdfDoc.Close();
它將從HTML文件中讀取並將其寫入創建的PDF文件中
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