Czym jest iText? (Alternatywy biblioteki PDF C# i Java przy użyciu IronPDF)

using iText.Kernel.Pdf;
using iText.Layout;
using iText.Layout.Element;
using iText.Layout.Properties;
using System.IO;

// Create a new PDF document
using (var writer = new PdfWriter(new FileStream("newfile.pdf", FileMode.Create)))
{
    using (var pdf = new PdfDocument(writer))
    {
        var document = new Document(pdf);

        // Create a header paragraph
        Paragraph header = new Paragraph("HEADER")
            .SetTextAlignment(TextAlignment.CENTER)
            .SetFontSize(16);

        // Add the header to the document
        document.Add(header);

        // Loop through pages and align header text
        for (int i = 1; i <= pdf.GetNumberOfPages(); i++)
        {
            Rectangle pageSize = pdf.GetPage(i).GetPageSize();
            float x = pageSize.GetWidth() / 2;
            float y = pageSize.GetTop() - 20;

            // Add the header text to each page
            document.ShowTextAligned(header, x, y, i, TextAlignment.LEFT, VerticalAlignment.BOTTOM, 0);
        }

        // Set the margins
        document.SetTopMargin(50);
        document.SetBottomMargin(50);
    }
}

Imports iText.Kernel.Pdf
Imports iText.Layout
Imports iText.Layout.Element
Imports iText.Layout.Properties
Imports System.IO

' Create a new PDF document
Using writer = New PdfWriter(New FileStream("newfile.pdf", FileMode.Create))
	Using pdf = New PdfDocument(writer)
		Dim document As New Document(pdf)

		' Create a header paragraph
		Dim header As Paragraph = (New Paragraph("HEADER")).SetTextAlignment(TextAlignment.CENTER).SetFontSize(16)

		' Add the header to the document
		document.Add(header)

		' Loop through pages and align header text
		Dim i As Integer = 1
		Do While i <= pdf.GetNumberOfPages()
			Dim pageSize As Rectangle = pdf.GetPage(i).GetPageSize()
'INSTANT VB WARNING: Instant VB cannot determine whether both operands of this division are integer types - if they are then you should use the VB integer division operator:
			Dim x As Single = pageSize.GetWidth() / 2
			Dim y As Single = pageSize.GetTop() - 20

			' Add the header text to each page
			document.ShowTextAligned(header, x, y, i, TextAlignment.LEFT, VerticalAlignment.BOTTOM, 0)
			i += 1
		Loop

		' Set the margins
		document.SetTopMargin(50)
		document.SetBottomMargin(50)
	End Using
End Using

using iText.Kernel.Pdf;
using iText.Layout;
using iText.Layout.Element;
using iText.Layout.Properties;
using iText.Html2pdf;
using System.IO;

/**
 * iText URL to PDF
 * anchor-itext-url-to-pdf
 **/
private void ExistingWebURL()
{
    // Initialize PDF writer
    PdfWriter writer = new PdfWriter("wikipedia.pdf");

    // Initialize PDF document
    using PdfDocument pdf = new PdfDocument(writer);

    ConverterProperties properties = new ConverterProperties();
    properties.SetBaseUri("https://en.wikipedia.org/wiki/Portable_Document_Format");

    // Convert HTML to PDF
    Document document = HtmlConverter.ConvertToDocument(
        new FileStream("Test_iText7_1.pdf", FileMode.Open), pdf, properties);

    // Create and add a header paragraph
    Paragraph header = new Paragraph("HEADER")
        .SetTextAlignment(TextAlignment.CENTER)
        .SetFontSize(16);

    document.Add(header);

    // Align header text for each page
    for (int i = 1; i <= pdf.GetNumberOfPages(); i++)
    {
        Rectangle pageSize = pdf.GetPage(i).GetPageSize();
        float x = pageSize.GetWidth() / 2;
        float y = pageSize.GetTop() - 20;

        // Add header text aligned at the top
        document.ShowTextAligned(header, x, y, i, TextAlignment.LEFT, VerticalAlignment.BOTTOM, 0);
    }

    // Set the top and bottom margins
    document.SetTopMargin(50);
    document.SetBottomMargin(50);
    document.Close();
}

Imports iText.Kernel.Pdf
Imports iText.Layout
Imports iText.Layout.Element
Imports iText.Layout.Properties
Imports iText.Html2pdf
Imports System.IO

'''
''' * iText URL to PDF
''' * anchor-itext-url-to-pdf
''' *
Private Sub ExistingWebURL()
	' Initialize PDF writer
	Dim writer As New PdfWriter("wikipedia.pdf")

	' Initialize PDF document
	Using pdf As New PdfDocument(writer)
	
		Dim properties As New ConverterProperties()
		properties.SetBaseUri("https://en.wikipedia.org/wiki/Portable_Document_Format")
	
		' Convert HTML to PDF
		Dim document As Document = HtmlConverter.ConvertToDocument(New FileStream("Test_iText7_1.pdf", FileMode.Open), pdf, properties)
	
		' Create and add a header paragraph
		Dim header As Paragraph = (New Paragraph("HEADER")).SetTextAlignment(TextAlignment.CENTER).SetFontSize(16)
	
		document.Add(header)
	
		' Align header text for each page
		Dim i As Integer = 1
		Do While i <= pdf.GetNumberOfPages()
			Dim pageSize As Rectangle = pdf.GetPage(i).GetPageSize()
'INSTANT VB WARNING: Instant VB cannot determine whether both operands of this division are integer types - if they are then you should use the VB integer division operator:
			Dim x As Single = pageSize.GetWidth() / 2
			Dim y As Single = pageSize.GetTop() - 20
	
			' Add header text aligned at the top
			document.ShowTextAligned(header, x, y, i, TextAlignment.LEFT, VerticalAlignment.BOTTOM, 0)
			i += 1
		Loop
	
		' Set the top and bottom margins
		document.SetTopMargin(50)
		document.SetBottomMargin(50)
		document.Close()
	End Using
End Sub

// Execute this command in the Package Manager Console
Install-Package IronPdf

using IronPdf;

// Path to an existing PDF file
var existingPdf = @"C:\path\to\existing\pdf\document.pdf";

// Load the PDF document
var pdfDoc = PdfDocument.FromFile(existingPdf);

Imports IronPdf

' Path to an existing PDF file
Private existingPdf = "C:\path\to\existing\pdf\document.pdf"

' Load the PDF document
Private pdfDoc = PdfDocument.FromFile(existingPdf)

// Add a new page with default size
var newPage = pdfDoc.AddPage();
newPage.Size = PageSize.Letter;

' Add a new page with default size
Dim newPage = pdfDoc.AddPage()
newPage.Size = PageSize.Letter

using IronPdf;

/**
 * IronPDF URL to PDF
 * anchor-ironpdf-website-to-pdf
 **/
private void ExistingWebURL()
{
    // Create PDF from a webpage
    var Renderer = new IronPdf.ChromePdfRenderer();

    // Set rendering options
    Renderer.RenderingOptions.MarginTop = 50; // millimeters
    Renderer.RenderingOptions.MarginBottom = 50;
    Renderer.RenderingOptions.CssMediaType = IronPdf.Rendering.PdfCssMediaType.Print;
    Renderer.RenderingOptions.TextHeader = new TextHeaderFooter()
    {
        CenterText = "{pdf-title}",
        DrawDividerLine = true,
        FontSize = 16
    };
    Renderer.RenderingOptions.TextFooter = new TextHeaderFooter()
    {
        LeftText = "{date} {time}",
        RightText = "Page {page} of {total-pages}",
        DrawDividerLine = true,
        FontSize = 14
    };
    Renderer.RenderingOptions.EnableJavaScript = true;
    Renderer.RenderingOptions.RenderDelay = 500; // milliseconds

    // Render URL as PDF
    using var PDF = Renderer.RenderUrlAsPdf("https://en.wikipedia.org/wiki/Portable_Document_Format");
    PDF.SaveAs("wikipedia.pdf");
}

Imports IronPdf

'''
''' * IronPDF URL to PDF
''' * anchor-ironpdf-website-to-pdf
''' *
Private Sub ExistingWebURL()
	' Create PDF from a webpage
	Dim Renderer = New IronPdf.ChromePdfRenderer()

	' Set rendering options
	Renderer.RenderingOptions.MarginTop = 50 ' millimeters
	Renderer.RenderingOptions.MarginBottom = 50
	Renderer.RenderingOptions.CssMediaType = IronPdf.Rendering.PdfCssMediaType.Print
	Renderer.RenderingOptions.TextHeader = New TextHeaderFooter() With {
		.CenterText = "{pdf-title}",
		.DrawDividerLine = True,
		.FontSize = 16
	}
	Renderer.RenderingOptions.TextFooter = New TextHeaderFooter() With {
		.LeftText = "{date} {time}",
		.RightText = "Page {page} of {total-pages}",
		.DrawDividerLine = True,
		.FontSize = 14
	}
	Renderer.RenderingOptions.EnableJavaScript = True
	Renderer.RenderingOptions.RenderDelay = 500 ' milliseconds

	' Render URL as PDF
	Dim PDF = Renderer.RenderUrlAsPdf("https://en.wikipedia.org/wiki/Portable_Document_Format")
	PDF.SaveAs("wikipedia.pdf")
End Sub

using iText.Html2pdf;
using System.IO;

/**
 * iText HTML to PDF
 * anchor-itext-html-to-pdf
 **/
private void HTMLString()
{
    HtmlConverter.ConvertToPdf("<h1>Hello iText7</h1>", new FileStream("iText7HtmlToPdf.pdf", FileMode.Create));
}

Imports iText.Html2pdf
Imports System.IO

'''
''' * iText HTML to PDF
''' * anchor-itext-html-to-pdf
''' *
Private Sub HTMLString()
	HtmlConverter.ConvertToPdf("<h1>Hello iText7</h1>", New FileStream("iText7HtmlToPdf.pdf", FileMode.Create))
End Sub