PdfDocumentProcessor.CreateEmptyDocument() Method
Creates an empty PDF document with no pages.
Namespace: DevExpress.Pdf
Assembly: DevExpress.Docs.v18.2.dll
Declaration
Remarks
Use this method to create an empty document. Then, you can continue to generate the document layout (e.g., append pages with graphics to the PDF document, generate bookmarks, and attach files) using the PDF document creation API. For more information, see the Document Generation topic.
Note
The PDF specification does not describe empty documents. For this reason, most third-party PDF viewers cannot open such files. This does not apply to the DevExpress WinForms PDF Viewer and WPF PDF Viewer, which are less demanding concerning the validity of opened documents, and are capable of opening documents containing no pages.
Example
The PDF Document Processor allows you to draw graphic primitives on the PDF page, such as lines, Bezier curves, polygons, ellipses, paths, an image and a string.
This example shows how to draw a business card in the document foreground. To accomplish this task, do the following:
- Create a PDF document processor and add an empty document to it by calling the PdfDocumentProcessor.CreateEmptyDocument method.
- Create PDF graphics represented by an instance of the PdfGraphics class by calling the PdfDocumentProcessor.CreateGraphics method. To access PdfGraphics, you need to reference the DevExpress.Pdf.Drawing assembly.
- To draw an image on the PDF page, call the PdfGraphics.DrawImage method for the specified image at the specified location with the specified size.
- To draw text, call the PdfGraphics.DrawString method at the specified location with the specified Brush and Font objects.
- Render a page with created graphics by calling the PdfDocumentProcessor.RenderNewPage method.
Note
A complete sample project is available at https://github.com/DevExpress-Examples/how-to-generate-a-document-layout-from-scratch-t244516
Imports DevExpress.Pdf
Imports System
Imports System.Drawing
Namespace DocumentCreationAPI
Friend Class Program
Shared Sub Main(ByVal args() As String)
Using processor As New PdfDocumentProcessor()
' Create an empty document.
processor.CreateEmptyDocument("..\..\Result.pdf")
' Create and draw PDF graphics.
Using graph As PdfGraphics = processor.CreateGraphics()
DrawGraphics(graph)
' Render a page with graphics.
processor.RenderNewPage(PdfPaperSize.Letter, graph)
End Using
End Using
End Sub
Private Shared Sub DrawGraphics(ByVal graph As PdfGraphics)
' Draw text lines on the page.
Dim black As SolidBrush = CType(Brushes.Black, SolidBrush)
Using font1 As New Font("Times New Roman", 32, FontStyle.Bold)
graph.DrawString("PDF Document Processor", font1, black, 180, 150)
End Using
Using font2 As New Font("Arial", 20)
graph.DrawString("Display, Print and Export PDF Documents", font2, black, 168, 230)
End Using
Using font3 As New Font("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)
End Using
End Sub
End Class
End Namespace