I am using iText to generate PDFs and I have a symbol σ which does not get added to the PDF.
Is this because of font selection (using HELVETICA_BOLD)?
Can anyone help?
The σ-symbol doesn't exist in Helvetica, so you need to use the Symbol font. This is demonstrated in the StandardDeviation. See standard_deviation.pdf:
This is how it's done:
public void createPdf(String dest) throws IOException, DocumentException {
Document document = new Document();
PdfWriter.getInstance(document, new FileOutputStream(dest));
document.open();
document.add(new Paragraph("The standard deviation symbol doesn't exist in Helvetica."));
Font symbol = new Font(FontFamily.SYMBOL);
Paragraph p = new Paragraph("So we use the Symbol font: ");
p.add(new Chunk("s", symbol));
document.add(p);
document.close();
}
Related
I am using itextpdf html2pdf tool to implement freemarker template to generate pdf
Refer to the official documentation link：
https://kb.itextpdf.com/home/it7kb/ebooks/itext-7-converting-html-to-pdf-with-pdfhtml/chapter-7-frequently-asked-questions-about-pdfhtml/can-pdfhtml-render-base64-images-to-pdf
The front end uses echarts to convert the image to base64.
The picture can be displayed clearly on the browser, but after the pdf is generated, the picture becomes blurry.
Refer to html and pdf image comparison：
html pdf
public static void main(String[] args) throws Exception{
File file = FileUtil.newFile("D:/test.html");
BufferedOutputStream outputStream = FileUtil.getOutputStream("D:/test.pdf");
BufferedInputStream inputStream = FileUtil.getInputStream(file);
ConverterProperties converterProperties=new ConverterProperties();
FontProvider fontProvider=new DefaultFontProvider();
FontProgram fontProgram = FontProgramFactory.createFont(Constant.CONFIG_PATH+File.separator+"simsun.ttc,1");
fontProvider.addFont(fontProgram);
MediaDeviceDescription mediaDeviceDescription = new MediaDeviceDescription(MediaType.SCREEN);
mediaDeviceDescription.setResolution(2000f);
converterProperties.setFontProvider(fontProvider);
converterProperties.setMediaDeviceDescription(mediaDeviceDescription);
PdfDocument pdfDoc = new PdfDocument(new PdfWriter(outputStream));
pdfDoc.setDefaultPageSize(new PageSize(1000,1700));
HtmlConverter.convertToPdf(inputStream,pdfDoc,converterProperties);
}
I'm using iTextSharp 5.5.13 and when i try to generate the PDF with Hebrew it comes out empty.
this is my code: I'm i doing something wrong?
public byte[] GenerateIvhunPdf(FinalIvhunSolution ivhun)
{
byte[] pdfBytes;
using (var mem = new MemoryStream())
{
Document document = new Document(PageSize.A4);
PdfWriter writer = PdfWriter.GetInstance(document, mem);
writer.PageEvent = new MyHeaderNFooter();
document.Open();
var font = new
Font(BaseFont.CreateFont("C:\\Downloads\\fonts\\Rubik-Light.ttf", BaseFont.IDENTITY_H, BaseFont.NOT_EMBEDDED), 14);
Paragraph p = new Paragraph("פסקת פתיחה")
{
Alignment = Element.ALIGN_RIGHT
};
PdfPTable table = new PdfPTable(2)
{
RunDirection = PdfWriter.RUN_DIRECTION_RTL
};
PdfPCell cell = new PdfPCell(new Phrase("מזהה", font));
cell.BackgroundColor = BaseColor.BLACK;
table.AddCell(cell);
document.Add(p);
document.Add(table);
document.Close();
pdfBytes = mem.ToArray();
}
return pdfBytes;
}
The PDF comes out blank
I changed a few details of your code, and now I get this:
My changes:
Embedding the font
As I don't have Rubik installed on my system, I have to embed the font into the PDF to have a chance to see anything. Thus, I replaced BaseFont.NOT_EMBEDDED by BaseFont.EMBEDDED when creating the var font:
var font = new Font(BaseFont.CreateFont("Rubik-Light.ttf", BaseFont.IDENTITY_H, BaseFont.EMBEDDED), 14);
Making the Paragraph kind of work
You create the Paragraph p without specifying a font. Thus, a default font with default encoding is used. The default encoding is WinAnsiEncoding which is Latin1-like, so no Hebrew characters can be represented. I added your Rubik font instance to the Paragraph p creation:
Paragraph p = new Paragraph("פסקת פתיחה", font)
{
Alignment = Element.ALIGN_RIGHT
};
Et voilà, the writing appears.
iText developers often have communicated that in iText 5.x and earlier right-to-left scripts are only supported properly in certain contexts, e.g. in tables, but not in others like paragraphs immediately added to the document. As your Paragraph p is added immediately to the Document document, its letters appear in the wrong order in the output.
Making the PdfPTable work
You defined the PdfPTable table to have two columns (new PdfPTable(2)) but then you added only one cell. Thus, table contains not even a single complete row. iText, therefore, draws nothing when it is added to the document.
I changed the definition of table to have a single column only:
PdfPTable table = new PdfPTable(1)
{
RunDirection = PdfWriter.RUN_DIRECTION_RTL
};
Furthermore, I commented out the line setting the cell background to black because usually it is difficult to read black on black:
PdfPCell cell = new PdfPCell(new Phrase("מזהה", font));
//cell.BackgroundColor = BaseColor.BLACK;
table.AddCell(cell);
And again the writing appears.
Properly downloading the font
Another possible obstacle is that when downloading the font from the URL you gave — https://fonts.google.com/selection?selection.family=Rubik — one can see in the customization tab of the selection drawer that by default only Latin characters are included in the download, in particular not Hebrew ones:
I tested with a font file I downloaded with all language options enabled:
I have used iText to fill data into existing AcroForm fields in a PDF.
I am now looking for a solution to add new AcroForm fields to a PDF. Is this possible with iText? If so, how can I do this?
This is documented in the official documentation, more specifically in the SubmitForm example. When using a tool such as iText, you should read the official documentation first ;-)
Anyway, I've written you a simple example called AddField. It adds a button field at a specific position defined by new Rectangle(36, 700, 72, 730).
public void manipulatePdf(String src, String dest) throws DocumentException, IOException {
PdfReader reader = new PdfReader(src);
PdfStamper stamper = new PdfStamper(reader, new FileOutputStream(dest));
PushbuttonField button = new PushbuttonField(
stamper.getWriter(), new Rectangle(36, 700, 72, 730), "post");
button.setText("POST");
button.setBackgroundColor(new GrayColor(0.7f));
button.setVisibility(PushbuttonField.VISIBLE_BUT_DOES_NOT_PRINT);
PdfFormField submit = button.getField();
submit.setAction(PdfAction.createSubmitForm(
"http://itextpdf.com:8180/book/request", null,
PdfAction.SUBMIT_HTML_FORMAT | PdfAction.SUBMIT_COORDINATES));
stamper.addAnnotation(submit, 1);
stamper.close();
}
}
As you can see, you need to create a PdfFormField object (using helper classes such as PushbuttonField, TextField,...) and then use PdfStamper's addAnnotation() method to add the field to a specific page.
I attempted several ways to do this, but still cannot get it.
It appears iTextSharp requires a 2 pass situation so that an image appears on top of the text.
So I am attempting to do this using memory streams, but I keep getting errors.
Public Function createDoc(ByRef reqResponse As HttpResponse) As Boolean
Dim m As System.IO.MemoryStream = New System.IO.MemoryStream()
Dim document As Document = New Document()
Dim writer As PdfWriter = iTextSharp.text.pdf.PdfWriter.GetInstance(document, m)
document.Open()
document.Add(New Paragraph(DateTime.Now.ToString()))
document.Add(New Paragraph(DateTime.Now.ToString()))
document.Add(New Paragraph(DateTime.Now.ToString()))
document.Add(New Paragraph(DateTime.Now.ToString()))
document.Add(New Paragraph(DateTime.Now.ToString()))
document.Add(New Paragraph(DateTime.Now.ToString()))
document.Add(New Paragraph(DateTime.Now.ToString()))
document.Close()
writer.Flush()
writer.Flush()
'yes; I get the pdf if this is the last statement
'reqResponse.OutputStream.Write(m.GetBuffer(), 0, m.GetBuffer().Length)
'this statment does not work it says the stream is closed
'm.Position = 0
Dim Reader As PdfReader = New PdfReader(m)
'Dim rm As MemoryStream = New MemoryStream(m.GetBuffer(), 0, m.GetBuffer().Length)
Dim PdfStamper As PdfStamper = New PdfStamper(Reader, reqResponse.OutputStream)
Dim cb As iTextSharp.text.pdf.PdfContentByte = Nothing
cb = PdfStamper.GetOverContent(1)
Dim locMyImage As System.Drawing.Image = System.Drawing.Image.FromStream(zproProduceWhiteImageToCovertBarCodeNumbers())
Dim BImage As iTextSharp.text.Image = iTextSharp.text.Image.GetInstance(locMyImage, iTextSharp.text.BaseColor.CYAN)
Dim overContent As PdfContentByte = PdfStamper.GetOverContent(1)
BImage.SetAbsolutePosition(5, 5)
overContent.AddImage(BImage)
PdfStamper.FormFlattening = True
PdfStamper.Close()
'rm.Flush()
'rm.Close()
'Dim data As Byte() = rm.ToArray()
'reqResponse.Clear()
'Dim finalMs As MemoryStream = New MemoryStream(data)
'reqResponse.ContentType = "application/pdf"
'reqResponse.AddHeader("content-disposition", "attachment;filename=labtest.pdf")
'reqResponse.Buffer = True
'finalMs.WriteTo(reqResponse.OutputStream)
'reqResponse.End()
'Dim data As Byte() = rm.ToArray()
'reqResponse.OutputStream.Write(data, 0, data.Length)
''Response.OutputStream.Write(m.GetBuffer(), 0, m.GetBuffer().Length);
''Response.OutputStream.Flush();
''Response.OutputStream.Close();
''Response.End();
HttpContext.Current.ApplicationInstance.CompleteRequest()
Return True
End Function
reference:
Put text on top of an image?
seach engine reference:
whiteout text on a pdf document by using a image which is the same color as the background pdf
image overlap with itextpdf
itextsharp image on top of the text whiteout
itextsharp place picture on top of text
itextpdf image on top
thanks,
Doug Lubey of Louisiana
You can do this pretty easily. The Document object is a helper object that abstracts away many of the internals of the PDF model and for the most part assumes that you want to flow content and that text would go above images. If you want to get around this you can talk directly the PdfWriter object instead. It has two properties, DirectContent and DirectContentUnder that both have methods named AddImage() that you can use to set an absolute position on an image. DirectContent is above existing content and DirectContentUnder is below it. See the code for an example:
You appear to be doing this on the web so you'll need to adapt this to whatever stream you are using but that should be pretty easy.
One note, NEVER call GetBuffer() on a MemoryStream, ALWAYS use ToArray(). The former method includes uninitialized bytes that will give you potentially corrupt PDFs.
''//File that we are creating
Dim OutputFile As String = System.IO.Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.Desktop), "Test.pdf")
''//Image to place
Dim SampleImage As String = System.IO.Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.Desktop), "SampleImage.jpg")
''//Standard PDF creation setup
Using FS As New FileStream(OutputFile, FileMode.Create, FileAccess.Write, FileShare.None)
Using Doc As New Document(PageSize.LETTER)
Using writer = PdfWriter.GetInstance(Doc, FS)
''//Open the document for writing
Doc.Open()
''//Add a simple paragraph
Doc.Add(New Paragraph("Hello world"))
''//Create an image object
Dim Img = iTextSharp.text.Image.GetInstance(SampleImage)
''//Give it an absolute position in the top left corner of the document (remembering that 0,0 is bottom left, not top left)
Img.SetAbsolutePosition(0, Doc.PageSize.Height - Img.Height)
''//Add it directly to the raw pdfwriter instead of the document helper. DirectContent is above and DirectContentUnder is below
writer.DirectContent.AddImage(Img)
''//Close the document
Doc.Close()
End Using
End Using
End Using
All of the examples I have seen so far using ITextSharp start from scratch and create a new document, add something to it and close it.
What if I need to do multiple things to a PDF for example I want to add a paragraph and then add a line.
For example if I run this simple console app in which I just create a PDF and add a paragraph and then close it everything runs fine.
class Program
{
static void Main(string[] args)
{
Document pdfDoc = new Document();
PdfWriter.GetInstance(pdfDoc, new FileStream("TestPDF.pdf", FileMode.Create));
pdfDoc.Open();
pdfDoc.Add(new Paragraph("Some Text added"));
pdfDoc.Close();
Console.WriteLine("The file was created.");
Console.ReadLine();
}
}
However if I need to do something else like draw a line like this
class Program
{
static void Main(string[] args)
{
Document pdfDoc = new Document();
PdfWriter.GetInstance(pdfDoc, new FileStream("TestPDF.pdf", FileMode.Create));
pdfDoc.Open();
pdfDoc.Add(new Paragraph("Some Text added"));
PdfWriter writer = PdfWriter.GetInstance(pdfDoc, new FileStream("TestPDF.pdf", FileMode.OpenOrCreate));
PdfContentByte cb = writer.DirectContent;
cb.MoveTo(pdfDoc.PageSize.Width / 2, pdfDoc.PageSize.Height / 2);
cb.LineTo(pdfDoc.PageSize.Width / 2, pdfDoc.PageSize.Height);
cb.Stroke();
writer.Close();
pdfDoc.Close();
Console.WriteLine("The file was created.");
Console.ReadLine();
}
}
I get an error when trying to open the file because it is already opened by pdfDoc.
If I put the highlighted code after the pdfDoc.Close() I get an error saying "The Document is not opened"
How do I switch from adding text to adding a line?
Do I need to close the doc and then re-open it again with the PDFReader and modify it there or can I do it all at once?
You're getting an error because you're trying to request a second instance of a PDFWriter when you already have one. The second PdfWriter.GetInstance(pdfDoc, new FileStream("TestPDF.pdf", FileMode.OpenOrCreate)); is not needed. I made a small edit to your code and this now seems to work
Document pdfDoc = new Document();
PdfWriter writer = PdfWriter.GetInstance(pdfDoc, new FileStream("TestPDF.pdf", FileMode.OpenOrCreate));
pdfDoc.Open();
pdfDoc.Add(new Paragraph("Some Text added"));
PdfContentByte cb = writer.DirectContent;
cb.MoveTo(pdfDoc.PageSize.Width / 2, pdfDoc.PageSize.Height / 2);
cb.LineTo(pdfDoc.PageSize.Width / 2, pdfDoc.PageSize.Height);
cb.Stroke();
pdfDoc.Close();
Console.WriteLine("The file was created.");
Console.ReadLine();