PdfDocumentProcessor.CreateEmptyDocument(Stream, PdfCreationOptions) Method

Creates an empty PDF with no pages using a stream and PDF creation options.

Namespace: DevExpress.Pdf

Assembly: DevExpress.Docs.v20.2.dll

NuGet Package: DevExpress.Document.Processor

NuGet Packages: DevExpress.Document.Processor, DevExpress.WindowsDesktop.Document.Processor

Declaration

C#

public void CreateEmptyDocument(
    Stream stream,
    PdfCreationOptions creationOptions
)

VB.NET

Public Sub CreateEmptyDocument(
    stream As Stream,
    creationOptions As PdfCreationOptions
)

Parameters

Name	Type	Description
stream	Stream	A Stream class descendant specifying the stream to which the PDF empty document should be written.
creationOptions	PdfCreationOptions	A PdfCreationOptions object that contains PDF compatibility and font embedding options.

Remarks

Set the PdfCreationOptions.Compatibility property to one of the PdfCompatibility enumeration values to create an empty PDF document. The PdfCreationOptions.DisableEmbeddingAllFonts property allows you to disable embedding all fonts when the document is created. To disable embedding certain fonts, use the PdfCreationOptions.NotEmbeddedFontFamilies property.

Use the PDF document creation API to continue to generate the document layout (e.g., append pages with graphics to the PDF document, generate bookmarks, and attach files). Refer to the following topic for more information: Additional Content

Note

When all operations with a created document are completed, close the document either by the PdfDocumentProcessor.CloseDocument method call or dispose of the PdfDocumentProcessor instance.

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.

This CreateEmptyDocument method overload writes generated document content into the stream specified as this method’s parameter. The SaveDocument method call rewrites this stream.

Example

This example shows how to programmatically create a document with graphics using the PDF Document API.

• Create an empty document with no pages by calling one of the PdfDocumentProcessor.CreateEmptyDocument overload methods (e.g., using a file path).
• Call the PdfDocumentProcessor.CreateGraphics method to create PDF graphics represented by the PdfGraphics class instance. Make sure that you have reference to the DevExpress.Pdf.Drawing assembly to access PdfGraphics.
• Draw the graphic content (e.g., an image, a string, lines, polygons) by calling the corresponding Draw method.
• Use the PdfDocumentProcessor.RenderNewPage method to render a page with created graphics.

View Example

Program.cs

using DevExpress.Pdf;
using System;
using System.Drawing;

namespace DocumentCreationAPI
{
  class Program {

    static void Main(string[] args)
    {

      using (PdfDocumentProcessor processor = new PdfDocumentProcessor())
      {

        // Create an empty document.
        processor.CreateEmptyDocument("..\\..\\Result.pdf");

        // Create and draw PDF graphics.
        using (PdfGraphics graph = processor.CreateGraphics())
        {
          DrawGraphics(graph);

         // Render a page with graphics.
         processor.RenderNewPage(PdfPaperSize.Letter, graph);
        }
     }
  }

    static void DrawGraphics(PdfGraphics graph)
    {

        // Draw text lines on the page.
        SolidBrush black = (SolidBrush)Brushes.Black;
        using (Font font1 = new Font("Times New Roman", 32, FontStyle.Bold))
        {
            graph.DrawString("PDF Document Processor", font1, black, 180, 150);
        }
        using (Font font2 = new Font("Arial", 20))
        {
            graph.DrawString("Display, Print and Export PDF Documents", font2, black, 168, 230);
        }
        using (Font font3 = 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);
        }
    }
}
}

Program.vb

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