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PdfDocumentProcessor Class

A non-visual component that allows you to generate PDF files from scratch and manipulate existing documents.

Namespace: DevExpress.Pdf

Assembly: DevExpress.Docs.v24.2.dll

NuGet Package: DevExpress.Document.Processor

#Declaration

public class PdfDocumentProcessor :
    PdfDisposableObject

#Remarks

The DevExpress PDF Document API allows you to create, edit, merge, split, password protect, and digitally sign PDF files in code.

You need a license for the DevExpress Office File API Subscription or DevExpress Universal Subscription to use the PDF Document API.

Warning

The PdfDocumentProcessor should not be accessed simultaneously by different threads.

#Example

This example shows the PDF Document Creation API that is used to programmatically generate a document layout.

  • The custom DrawGraphics method draws content inside an empty PDF document.
  • The custom AddWatermark method generates a watermark with custom text and adds it to the created PDF document.

When you launch the app, the file is saved to your Documents folder (%userprofile%/Documents).

pdf-api-generate-content-and-watermark

View Example

using DevExpress.Drawing;
using DevExpress.Pdf;
using System;
using System.Diagnostics;
using System.Drawing;
using System.IO;

namespace DocumentCreationAPI {
    class Program {
        static void Main(string[] args) {

            string docPath = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments),"Result.pdf");

            using (PdfDocumentProcessor processor = new PdfDocumentProcessor()) {
                // Create an empty document.
                processor.CreateEmptyDocument(docPath);
                // Create and draw PDF graphics.
                using (PdfGraphics graph = processor.CreateGraphics()) {
                    DrawGraphics(graph);
                    // Render a page with graphics.
                    processor.RenderNewPage(PdfPaperSize.Letter, graph);
                }
            }
            // Generate a watermark.
            AddWatermark("Not for sale",docPath,docPath);
            Process.Start(docPath);
        }

        // Draw graphics inside a PDF document.
        static void DrawGraphics(PdfGraphics graph) {
            // Draw text lines on the page. 
            DXSolidBrush black = (DXSolidBrush)DXBrushes.Black;
            DXFont font1 = new DXFont("Times New Roman", 32, DXFontStyle.Bold);
            graph.DrawString("PDF Document Processor", font1, black, 180, 150);

            DXFont font2 = new DXFont("Arial", 20);
            graph.DrawString("Display, Print and Export PDF Documents", font2, black, 168, 230);

            DXFont font3 = new DXFont("Arial", 10);
            graph.DrawString("The PDF Document Processor is a non-visual component " +
                              "that provides the application programming interface of the PDF Viewer.", font3, black, 16, 300);
        }

        // Add a watermark with custom text.
        static void AddWatermark(string text,string fileName,string resultFileName) {
            using (PdfDocumentProcessor documentProcessor = new PdfDocumentProcessor()) {
                string fontName = "Arial Black";
                int fontSize = 12;
                PdfStringFormat stringFormat = PdfStringFormat.GenericTypographic;
                stringFormat.Alignment = PdfStringAlignment.Center;
                stringFormat.LineAlignment = PdfStringAlignment.Center;
                documentProcessor.LoadDocument(fileName);
                using (DXSolidBrush brush = new DXSolidBrush(Color.FromArgb(63,Color.Black))) {
                    DXFont font = new DXFont(fontName,fontSize);
                    foreach (var page in documentProcessor.Document.Pages) {
                        var watermarkSize = page.CropBox.Width * 0.75;
                        using (PdfGraphics graphics = documentProcessor.CreateGraphics()) {
                            SizeF stringSize = graphics.MeasureString(text,font);
                            float scale = (float)(watermarkSize / (double)stringSize.Width);
                            graphics.TranslateTransform((float)(page.CropBox.Width * 0.5),(float)(page.CropBox.Height * 0.5));
                            graphics.RotateTransform((float)-45.0);
                            graphics.TranslateTransform((float)(-stringSize.Width * scale * 0.5),(float)(-stringSize.Height * scale * 0.5));
                            DXFont actualFont = new DXFont(fontName,fontSize * scale);
                            RectangleF rect = new RectangleF(0,0,stringSize.Width * scale,stringSize.Height * scale);
                            graphics.DrawString(text,actualFont,brush,rect,stringFormat);

                            graphics.AddToPageForeground(page,72,72);
                        }
                    }                    
                }
                documentProcessor.SaveDocument(resultFileName);
            }
        }
    }
}

#Implements

#Inheritance

Object
DevExpress.Pdf.Native.PdfDisposableObject
PdfDocumentProcessor
See Also