Это мой первый вопрос по stackoverflow .
Я надеюсь, что это будет приветствоваться.
Мой вопрос.
Я пытаюсь использовать iTextSharp для создания PDF-файла с верхним и нижним колонтитулами, количеством страниц и lo go.
Мой код приведен ниже, и моя проблема - ошибка в этой строке моего кода:
pdfDoc.Close();
Если я отключу эту строку, файл PDF будет создан, но он не сможет открыть поврежденный файл.
Ошибка:
Object reference not set to an instance of an object
Очень надеюсь на вашу помощь.
Создание файла PDF:
using (StringWriter sw = new StringWriter())
{
using (HtmlTextWriter hw = new HtmlTextWriter(sw))
{
pdffile.RenderControl(hw);
StringReader sr = new StringReader(sw.ToString());
string imagepath = Server.MapPath("..") + "\\Logo.jpg";
Document pdfDoc = new Document(PageSize.A4, 20f, 20f, 10f, 20f);
using (MemoryStream memoryStream = new MemoryStream())
{
try
{
PdfWriter writer = PdfWriter.GetInstance(pdfDoc, memoryStream);
pdfDoc.Open();
writer.PageEvent = new Footer();
BaseFont bfTimes = BaseFont.CreateFont(BaseFont.TIMES_ROMAN, BaseFont.CP1252, false);
iTextSharp.text.Font times = new iTextSharp.text.Font(bfTimes, 12, iTextSharp.text.Font.ITALIC, iTextSharp.text.BaseColor.MAGENTA);
iTextSharp.text.Image image = iTextSharp.text.Image.GetInstance(imagepath);
pdfDoc.Add(image);
var cssResolver = new StyleAttrCSSResolver();
var cssFile = XMLWorkerHelper.GetCSS(new FileStream(HttpContext.Current.Server.MapPath("style.css"), FileMode.Open));
cssResolver.AddCss(cssFile);
// HTML
HtmlPipelineContext htmlContext = new HtmlPipelineContext(null);
htmlContext.SetTagFactory(Tags.GetHtmlTagProcessorFactory());
// Pipelines
PdfWriterPipeline pdfFile = new PdfWriterPipeline(pdfDoc, writer);
HtmlPipeline html = new HtmlPipeline(htmlContext, pdfFile);
CssResolverPipeline css = new CssResolverPipeline(cssResolver, html);
// XML Worker
XMLWorker worker = new XMLWorker(css, true);
XMLParser p = new XMLParser(worker);
p.Parse(sr);
pdfDoc.Close();
byte[] bytes = memoryStream.ToArray();
memoryStream.Close();
}
catch (Exception ex)
{
throw (ex);
}
}
}
}
Добавление верхнего / нижнего колонтитула в PDF
public partial class Footer : PdfPageEventHelper
{
PdfContentByte cb;
PdfTemplate headerTemplate, footerTemplate;
BaseFont bf = null;
DateTime PrintTime = DateTime.Now;
iTextSharp.text.Image image;
private string _header;
public string Header
{
get { return _header; }
set { _header = value; }
}
public override void OnOpenDocument(PdfWriter writer, Document document)
{
try
{
PrintTime = DateTime.Now;
bf = BaseFont.CreateFont(BaseFont.HELVETICA, BaseFont.CP1252, BaseFont.NOT_EMBEDDED);
cb = writer.DirectContent;
headerTemplate = cb.CreateTemplate(100, 100);
footerTemplate = cb.CreateTemplate(50, 50);
}
catch (DocumentException de)
{
//handle exception here
}
catch (System.IO.IOException ioe)
{
//handle exception here
}
}
public override void OnEndPage(iTextSharp.text.pdf.PdfWriter writer,
iTextSharp.text.Document document)
{
base.OnEndPage(writer, document);
iTextSharp.text.Font baseFontNormal =
new iTextSharp.text.Font(iTextSharp.text.Font.FontFamily.HELVETICA, 12f,
iTextSharp.text.Font.NORMAL, iTextSharp.text.BaseColor.BLACK);
iTextSharp.text.Font baseFontBig =
new iTextSharp.text.Font(iTextSharp.text.Font.FontFamily.HELVETICA, 12f,
iTextSharp.text.Font.BOLD, iTextSharp.text.BaseColor.BLACK);
Phrase p1Header = new Phrase("testing", baseFontNormal);
PdfPTable pdfTab = new PdfPTable(3);
PdfPCell pdfCell1 = new PdfPCell();
PdfPCell pdfCell2 = new PdfPCell(p1Header);
PdfPCell pdfCell3 = new PdfPCell();
String text = "Page " + writer.PageNumber + " of ";
{
cb.BeginText();
cb.SetFontAndSize(bf, 12);
cb.SetTextMatrix(document.PageSize.GetRight(200), document.PageSize.GetTop(45));
cb.ShowText(text);
cb.EndText();
float len = bf.GetWidthPoint(text, 12);
cb.AddTemplate(headerTemplate, document.PageSize.GetRight(200) + len, document.PageSize.GetTop(45));
}
{
cb.BeginText();
cb.SetFontAndSize(bf, 12);
cb.SetTextMatrix(document.PageSize.GetRight(180), document.PageSize.GetBottom(30));
cb.ShowText(text);
cb.EndText();
float len = bf.GetWidthPoint(text, 12);
cb.AddTemplate(footerTemplate, document.PageSize.GetRight(180) + len, document.PageSize.GetBottom(30));
Paragraph footer =
new Paragraph("©All Rights Reserved",
FontFactory.GetFont(FontFactory.HELVETICA, 8, iTextSharp.text.Font.ITALIC));
footer.Alignment = Element.ALIGN_RIGHT;
PdfPTable footerTbl = new PdfPTable(1);
footerTbl.TotalWidth = 800;
footerTbl.HorizontalAlignment = Element.ALIGN_CENTER;
PdfPCell cell = new PdfPCell(footer);
cell.Border = 0;
cell.PaddingLeft = 10;
footerTbl.AddCell(cell);
footerTbl.WriteSelectedRows(0, -1, 0, 30, writer.DirectContent);
}
PdfPCell pdfCell4 = new PdfPCell(new Phrase("test", baseFontNormal));
PdfPCell pdfCell5 = new PdfPCell(new Phrase("Date:" + PrintTime.ToShortDateString(), baseFontBig));
PdfPCell pdfCell6 = new PdfPCell();
PdfPCell pdfCell7 = new PdfPCell(new Phrase("Hour:" + string.Format("{0:t}", DateTime.Now), baseFontBig));
pdfCell1.HorizontalAlignment = Element.ALIGN_CENTER;
pdfCell2.HorizontalAlignment = Element.ALIGN_CENTER;
pdfCell3.HorizontalAlignment = Element.ALIGN_CENTER;
pdfCell4.HorizontalAlignment = Element.ALIGN_CENTER;
pdfCell5.HorizontalAlignment = Element.ALIGN_CENTER;
pdfCell6.HorizontalAlignment = Element.ALIGN_CENTER;
pdfCell7.HorizontalAlignment = Element.ALIGN_CENTER;
pdfCell2.VerticalAlignment = Element.ALIGN_BOTTOM;
pdfCell3.VerticalAlignment = Element.ALIGN_MIDDLE;
pdfCell4.VerticalAlignment = Element.ALIGN_TOP;
pdfCell5.VerticalAlignment = Element.ALIGN_MIDDLE;
pdfCell6.VerticalAlignment = Element.ALIGN_MIDDLE;
pdfCell7.VerticalAlignment = Element.ALIGN_MIDDLE;
pdfCell4.Colspan = 3;
pdfCell1.Border = 0;
pdfCell2.Border = 0;
pdfCell3.Border = 0;
pdfCell4.Border = 0;
pdfCell5.Border = 0;
pdfCell6.Border = 0;
pdfCell7.Border = 0;
pdfTab.AddCell(pdfCell1);
pdfTab.AddCell(pdfCell2);
pdfTab.AddCell(pdfCell3);
pdfTab.AddCell(pdfCell4);
pdfTab.AddCell(pdfCell5);
pdfTab.AddCell(pdfCell6);
pdfTab.AddCell(pdfCell7);
pdfTab.TotalWidth = document.PageSize.Width - 80f;
pdfTab.WidthPercentage = 70;
pdfTab.WriteSelectedRows(0, -1, 40, document.PageSize.Height - 30, writer.DirectContent);
cb.MoveTo(40, document.PageSize.Height - 100);
cb.LineTo(document.PageSize.Width - 40, document.PageSize.Height - 100);
cb.Stroke();
cb.MoveTo(40, document.PageSize.GetBottom(50));
cb.LineTo(document.PageSize.Width - 40, document.PageSize.GetBottom(50));
cb.Stroke();
}
public override void OnCloseDocument(PdfWriter writer, Document document)
{
base.OnCloseDocument(writer, document);
headerTemplate.BeginText();
headerTemplate.SetFontAndSize(bf, 12);
headerTemplate.SetTextMatrix(0, 0);
headerTemplate.ShowText((writer.PageNumber - 1).ToString());
headerTemplate.EndText();
footerTemplate.BeginText();
footerTemplate.SetFontAndSize(bf, 12);
footerTemplate.SetTextMatrix(0, 0);
footerTemplate.ShowText((writer.PageNumber - 1).ToString());
footerTemplate.EndText();
}
}