' Define the PDF Document object as a class member to make it accessible in the headerHtml_NavigationCompletedEvent handler ' where the header height will be automatically adjusted Private pdfDocument As Document ' Indicates if a line should be drawn at the botom of the header Private drawHeaderLine As Boolean = True Private Sub createPdfButton_Click(ByVal sender As Object, ByVal e As EventArgs) Handles createPdfButton.Click ' Create a PDF document pdfDocument = New Document() ' Set license key received after purchase to use the converter in licensed mode ' Leave it not set to use the converter in demo mode pdfDocument.LicenseKey = "fvDh8eDx4fHg4P/h8eLg/+Dj/+jo6Og=" ' Add a PDF page to PDF document Dim pdfPage As PdfPage = pdfDocument.AddPage() Cursor = Cursors.WaitCursor Dim headerHtmlUrl As String = System.IO.Path.Combine(Application.StartupPath, "DemoAppFiles\Input\HTML_Files\Header_HTML.html") Dim outPdfFile As String = "DemoAppFiles\Output\PDF_Creator\Auto_Resize_Header_Footer.pdf" Try ' Add the header to PDF document If autoResizeHeaderRadioButton.Checked Then ' Create the document header with a default height ' It will be automatically resized in headerHtml_NavigationCompletedEvent handler pdfDocument.AddHeaderTemplate(50) ' Create a HTML element to be added in header Dim headerHtml As New HtmlToPdfElement(headerHtmlUrl) ' Install a handler where to create the document header based on HTML element height AddHandler headerHtml.NavigationCompletedEvent, AddressOf headerHtml_NavigationCompletedEvent ' Add the HTML element to header ' When the element is rendered in header by converter, the headerHtml_NavigationCompletedEvent handler ' will be invoked and the header height will be automatically calculated pdfDocument.Header.AddElement(headerHtml) ' Uninstall the handler AddHandler headerHtml.NavigationCompletedEvent, AddressOf headerHtml_NavigationCompletedEvent Else ' Create the document header with a fixed height pdfDocument.AddHeaderTemplate(Single.Parse(headerHeightTextBox.Text)) ' Create a HTML to PDF element to be added in header Dim headerHtml As New HtmlToPdfElement(headerHtmlUrl) ' Set the HTML element to fit the container height headerHtml.FitHeight = True ' Add HTML element to fit the fixed header height pdfDocument.Header.AddElement(headerHtml) End If ' Draw a line at the header bottom If drawHeaderLine Then Dim headerWidth As Single = pdfDocument.Header.Width Dim headerHeight As Single = pdfDocument.Header.Height ' Create a line element for the bottom of the header Dim headerLine As New LineElement(0, headerHeight - 1, headerWidth, headerHeight - 1) ' Set line color headerLine.ForeColor = Color.Gray ' Add line element to the bottom of the header pdfDocument.Header.AddElement(headerLine) End If ' Create a HTML to PDF element to add to document Dim htmlToPdfElement As New HtmlToPdfElement(urlTextBox.Text) ' Optionally set a delay before conversion to allow asynchonous scripts to finish htmlToPdfElement.ConversionDelay = 2 ' Add the HTML to PDF element to document pdfPage.AddElement(htmlToPdfElement) ' Save the PDF document in a memory buffer Dim outPdfBuffer() As Byte = pdfDocument.Save() ' Write the memory buffer in a PDF file System.IO.File.WriteAllBytes(outPdfFile, outPdfBuffer) Catch ex As Exception ' The PDF creation failed MessageBox.Show(String.Format("Create PDF Document Error. {0}", ex.Message)) Return Finally ' Close the PDF document pdfDocument.Close() Cursor = Cursors.Arrow End Try ' Open the created PDF document in default PDF viewer Try Process.Start(outPdfFile) Catch ex As Exception MessageBox.Show(String.Format("Cannot open created PDF file '{0}'. {1}", outPdfFile, ex.Message)) End Try End Sub ''' <summary> ''' This handler is called after the navigation to header HTML completed. The document header is resized in this event handler ''' </summary> ''' <param name="eventParams">The event parameter containing the HTML content size in pixels and points</param> Private Sub headerHtml_NavigationCompletedEvent(ByVal eventParams As NavigationCompletedParams) ' Get the header HTML width and height from event parameters Dim headerHtmlWidth As Single = eventParams.HtmlContentWidthPt Dim headerHtmlHeight As Single = eventParams.HtmlContentHeightPt ' Get the header width Dim headerWidth As Single = pdfDocument.Header.Width ' Calculate a resize factor to fit the header width Dim resizeFactor As Single = 1 If headerHtmlWidth > headerWidth Then resizeFactor = headerWidth / headerHtmlWidth End If ' Calculate the header height to preserve the HTML aspect ratio Dim headerHeight As Single = headerHtmlHeight * resizeFactor If Not (headerHeight < pdfDocument.Pages(0).PageSize.Height - pdfDocument.Pages(0).Margins.Top - pdfDocument.Pages(0).Margins.Bottom) Then Throw New Exception("The header height cannot be bigger than PDF page height") End If ' Set the calculated header height pdfDocument.Header.Height = headerHeight End Sub