How to Export Each Page as an Image in PDF Documents

Environment

Product Version	Product	Author
2023.3.1114	RadPdfViewer for WinForms	Desislava Yordanova

Description

RadPdfViewer in the Telerik UI for WinForms suite is purposed to display PDF files. However, a common requirement is to extract each page from the loaded document as an image without displaying the control or any UI. This article demonstrates a sample approach how to generate the images for each page using the public API that RadPdfViewer offers.

Exported Pages as Images

Solution

RadPdfViewer exposes two methods that allow you to export a single page or the entire document to an image:

• ExportPage: Exports the specified page to an image.
• ExportPages: Exports the entire document to an image.

The ExportPage method will be used in the following code snippet:

static void Main(string[] args)
{
    Telerik.WinControls.UI.RadPdfViewer rViewer = new Telerik.WinControls.UI.RadPdfViewer();
    rViewer.DocumentLoaded += RViewer_DocumentLoaded;
    rViewer.LoadDocument(@"..\..\WinForms PdfViewer.pdf");
    rViewer.LoadElementTree();
    System.Windows.Forms.Application.DoEvents();
}
private static void RViewer_DocumentLoaded(object sender, System.EventArgs e)
{
    string filePath = @"..\..\page";
    Telerik.WinControls.UI.RadPdfViewerElement pdfViewerElement = sender as Telerik.WinControls.UI.RadPdfViewerElement;
    if (pdfViewerElement != null)
    {
        for (int i = 0; i < pdfViewerElement.Document.Pages.Count; i++)
        {
            System.Drawing.Image imagePage = pdfViewerElement.ExportPage(i, 1, true, System.Drawing.Imaging.ImageFormat.Jpeg);
            imagePage.Save(filePath + i + ".jpg");
        }
    }
}

 Sub Main()

     Dim rViewer As Telerik.WinControls.UI.RadPdfViewer = New Telerik.WinControls.UI.RadPdfViewer()
     AddHandler rViewer.DocumentLoaded, AddressOf RViewer_DocumentLoaded
     rViewer.LoadDocument("..\..\WinForms PdfViewer.pdf")
     rViewer.LoadElementTree()
     System.Windows.Forms.Application.DoEvents()
 End Sub

 Private Sub RViewer_DocumentLoaded(ByVal sender As Object, ByVal e As System.EventArgs)
     Dim filePath As String = "..\..\page"
     Dim pdfViewerElement As Telerik.WinControls.UI.RadPdfViewerElement =
         TryCast(sender, Telerik.WinControls.UI.RadPdfViewerElement)

     If pdfViewerElement IsNot Nothing Then

         For i As Integer = 0 To pdfViewerElement.Document.Pages.Count - 1
             Dim imagePage As System.Drawing.Image = pdfViewerElement.ExportPage(i, 1,
                                                                                 True, System.Drawing.Imaging.ImageFormat.Jpeg)
             imagePage.Save(filePath & i & ".jpg")
         Next
     End If
 End Sub  

Required Assembly References

• System.Windows.Forms
• Telerik.WinControls
• Telerik.WinControls.PdfViewer
• Telerik.WinControls.UI
• Telerik.Windows.Documents.Core
• Telerik.Windows.Documents.Fixed