我使用asp.net制作了一个桌面应用程序，将html转换为PDF。 基本上这个应用程序用于从数据库生成用户PDF。
进程：首先我将所有数据转换为html，然后使用itextsharp转换为PDF但在生成一些PDF后显示空白页
任何想法或任何人都面临此类问题
public static void converttopdf(string HtmlStream, List<Tuple<string, string>> tifffiles, List<Tuple<string, string>> pdffilestomerge, string filename, string patientfirstpagestr, string TableofContent, string patientheader, SqlConnection con, string sectiondetails)
{
MemoryStream msOutput = new MemoryStream();
TextReader reader = new StringReader(HtmlStream);
Document document = new Document(PageSize.A4, 30, 30, 42, 44);
string filetogenerate = string.Empty;
if (pdffilestomerge != null && pdffilestomerge.Count > 1)
{
filetogenerate = temppath + filename + "_Temp1.pdf";
}
else
{
filetogenerate = temppath + filename + "_Temp.pdf";
}
PdfWriter writer = PdfWriter.GetInstance(document, new System.IO.FileStream(filetogenerate, System.IO.FileMode.Create));
HTMLWorker worker = new HTMLWorker(document);
document.Open();
worker.StartDocument();
string[] separator = new string[] { @"<br clear='all' style='page-break-before:always'>" };
string[] pages = HtmlStream.Split(separator, StringSplitOptions.None);
foreach (string page in pages)
{
document.NewPage();
System.Collections.ArrayList htmlarraylist = HTMLWorker.ParseToList(new StringReader(page), null);
for (int k = 0; k < htmlarraylist.Count; k++)
{
document.Add((IElement)htmlarraylist[k]);
}
}
using (var ms = new MemoryStream())
{
if (tifffiles != null)
{
int docid = 0;
foreach (var obj in tifffiles)
{
string filepath = obj.Item2.ToString();
WriteLogEntry("bitmap file path : " + filepath);
if (filepath != string.Empty)
{
try
{
Bitmap myBitmap = new Bitmap(filepath);
System.Drawing.Color pixelColor = myBitmap.GetPixel(50, 50);
if (pixelColor.Name == "ff808080")
{
WriteLogEntry("convert image by irfanview :" + filepath);
LaunchCommandLineApp(filepath, temppath + "Test.jpg");
document.NewPage();
var imgStream = GetImageStream(temppath + "Test.jpg");
var image = iTextSharp.text.Image.GetInstance(imgStream);
image.SetAbsolutePosition(10, 80);
image.ScaleToFit(document.PageSize.Width - 60, document.PageSize.Height - 80);
//image.ScaleToFit(document.PageSize.Width - 30, document.PageSize.Height);
if (docid != Convert.ToInt32(obj.Item1))
{
Chunk c1 = new Chunk("#~@DID" + obj.Item1.ToString() + "#~@");
c1.Font.SetColor(0, 0, 0); //#00FFFFFF
c1.Font.Size = 0;
document.Add(c1);
}
document.Add(image);
File.Delete(temppath + "Test.jpg");
}
else
{
document.NewPage();
var imgStream = GetImageStream(filepath);
var image = iTextSharp.text.Image.GetInstance(imgStream);
image.SetAbsolutePosition(10, 80);
image.ScaleToFit(document.PageSize.Width - 60, document.PageSize.Height - 80);
//image.ScaleToFit(document.PageSize.Width - 30, document.PageSize.Height);
if (docid != Convert.ToInt32(obj.Item1))
{
Chunk c1 = new Chunk("#~@DID" + obj.Item1.ToString() + "#~@");
c1.Font.SetColor(0, 0, 0); //#00FFFFFF
c1.Font.Size = 0;
document.Add(c1);
}
document.Add(image);
WriteLogEntry("Image added successfully" + filepath);
}
}
catch
{
document.NewPage();
if (docid != Convert.ToInt32(obj.Item1))
{
Chunk c1 = new Chunk("#~@DID" + obj.Item1.ToString() + "#~@");
c1.Font.SetColor(0, 0, 0); //#00FFFFFF
c1.Font.Size = 0;
document.Add(c1);
}
WriteLogEntry("Image not valid" + filepath);
}
docid = Convert.ToInt32(obj.Item1);
}
}
}
}
worker.EndDocument();
worker.Close();
document.Close();
if (pdffilestomerge != null && pdffilestomerge.Count > 1)
{
string file = temppath + filename + "_Temp.pdf";
mergepdf(file, pdffilestomerge, filetogenerate);
}
PdfReader pdfreader = new PdfReader(temppath + filename + "_Temp.pdf");
Document document1 = new Document(PageSize.A4, 30, 30, 42, 44);
PdfWriter writer1 = PdfWriter.GetInstance(document1, new FileStream(FinalOutputPath + filename + ".pdf", FileMode.Create));
//HeaderFooter footer = new HeaderFooter(new Phrase("Page "), true);
//footer.Alignment = Element.ALIGN_RIGHT;
//footer.Border = iTextSharp.text.Rectangle.NO_BORDER;
//document1.Footer = footer;
//HeaderFooter header = new HeaderFooter(new Phrase(""), true);
//header.Alignment = Element.ALIGN_LEFT;
//header.Border = iTextSharp.text.Rectangle.NO_BORDER;
//document1.Add(header);
document1.Open();
PdfContentByte cb1 = writer1.DirectContent;
PdfImportedPage page1;
string test1 = TableofContent; int TableofContentPageCount = 0; int SectionPageStartNumber = 0;
string lastdocnamestr = "";
for (int t = 1; t <= pdfreader.NumberOfPages; t++)
{
document1.NewPage();
HeaderFooter header = new HeaderFooter(new Phrase(""), true);
header.Alignment = Element.ALIGN_LEFT;
header.Border = iTextSharp.text.Rectangle.NO_BORDER;
HeaderFooter header1 = new HeaderFooter(new Phrase(" "), true);
header1.Alignment = Element.ALIGN_LEFT;
header1.Border = iTextSharp.text.Rectangle.NO_BORDER;
HeaderFooter header2 = new HeaderFooter(new Phrase(" "), true);
header2.Alignment = Element.ALIGN_LEFT;
header2.Border = iTextSharp.text.Rectangle.NO_BORDER;
document1.Add(header);
document1.Add(header1);
document1.Add(header2);
page1 = writer1.GetImportedPage(pdfreader, t);
var baseFont = BaseFont.CreateFont(BaseFont.HELVETICA_BOLD, BaseFont.CP1252, BaseFont.NOT_EMBEDDED);
byte[] pdfcontent = pdfreader.GetPageContent(t);
//PdfDictionary dict = pdfreader.GetPageN(t);
string contentStream = System.Text.Encoding.Default.GetString(pdfcontent);
var contentByte = writer1.DirectContent;
contentByte.BeginText();
contentByte.SetFontAndSize(baseFont, 8);
var multiLineString = "";
var multiLineString1 = "";
string test = getBetween(contentStream, "#~@", "#~@");
if (test.Length > 0)
{
test1 = test1.Replace(test + ".", t.ToString());
DataTable dt = getdocdetailforheader(Convert.ToInt32(test.Replace("DID", "")), con);
if (dt.Rows.Count > 0)
{
multiLineString = dt.Rows[0]["DocumentName"].ToString() + " - " + Convert.ToDateTime(dt.Rows[0]["EncounterDTTM"].ToString()).ToString("MM/dd/yyyy") + " | Owner : " + dt.Rows[0]["Ownername"].ToString();
lastdocnamestr = multiLineString;
WriteLogEntry(multiLineString);
}
if (TableofContentPageCount == 0)
{
TableofContentPageCount = t;
}
}
//if (contentStream.Contains("sectionstart") && SectionPageStartNumber == 0) SectionPageStartNumber = t;
if (lastdocnamestr != string.Empty)
{
multiLineString = lastdocnamestr;
}
//else
//{
// if (TableofContentPageCount == 0)
// {
// multiLineString = "Table of Content";
// }
//}
multiLineString1 = patientheader;
contentByte.ShowTextAligned(PdfContentByte.ALIGN_LEFT, multiLineString, 15, 820, 0);
contentByte.ShowTextAligned(PdfContentByte.ALIGN_LEFT, multiLineString1, 15, 810, 0);
contentByte.EndText();
string relLogo = Directory.GetCurrentDirectory().ToString().Replace("bin", "").Replace("Debug", "").Replace("\\\\", "") + "\\Image\\MFA_LOGO.png";
iTextSharp.text.Image jpg = iTextSharp.text.Image.GetInstance(relLogo);
jpg.ScaleAbsolute(38f, 38f);
jpg.SetAbsolutePosition(document1.PageSize.Width - 70, 806);
jpg.Alignment = Element.ALIGN_RIGHT;
document1.Add(jpg);
cb1.MoveTo(0, 805);
cb1.LineTo(document1.PageSize.Width, 805);
cb1.Stroke();
cb1.AddTemplate(page1, 0, 0);
}
SectionPageStartNumber = pdfreader.NumberOfPages + 1;
System.Collections.ArrayList htmlarraylist1 = HTMLWorker.ParseToList(new StringReader(sectiondetails), null);
document1.NewPage();
for (int k = 0; k < htmlarraylist1.Count; k++)
{
document1.Add((IElement)htmlarraylist1[k]);
}
document1.Close();
FinalPDF(FinalOutputPath + filename + ".pdf", FinalOutputPath + filename + "_1.pdf", patientfirstpagestr, test1, TableofContentPageCount, patientheader, SectionPageStartNumber);
File.Delete(temppath + filename + "_Temp.pdf");