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Display Gauge for Documentrenderer.preparedocument Progress
https://forum.pdfsharp.net/viewtopic.php?f=2&t=1914		 Page 1 of 1
Author:  Portman [ Fri Feb 17, 2012 12:11 pm ]
Post subject:  Display Gauge for Documentrenderer.preparedocument Progress
Hello
I have a vb.net program calling migradoc 1.31 that create a PDF file correctly, I have created 2 versions one using PdfDocumentRenderer and other DocumentRenderer.
I am now trying to add code to display a progress bar to show progress in rendering a pdf document and am now confused so dont know if you can help.

the forum entry viewtopic.php?f=2&t=1654&p=4645
refers to PdfDocumentRenderer.DocumentRenderer.PrepareDocumentProgress
but
viewtopic.php?f=2&t=773&
refers to PrepareDocumentProgress event of DocumentRenderer and includes a short example in c#

I think that I must use DocumentRenderer but am having trouble understanding the calls required to get progress.
I have code as below based on the sample but trouble is in defining correct parameter to myhandler and then using it


Code:
    Dim docRenderer As MigraDoc.Rendering.DocumentRenderer
            docRenderer = New DocumentRenderer(document)

            Dim ProgressCompleted, ProgressPrepare As Integer
            Dim fe As New DocumentRenderer.PrepareDocumentProgressEventArgs(ProgressCompleted, ProgressPrepare)
            ProgressCompleted = 5
            ProgressPrepare = 95
 
          '           Dim myhandler As New DocumentRenderer.PrepareDocumentProgressEventHandler(AddressOf docRenderer)
              docRenderer.PrepareDocument()
     
          ' now create pdf pages
          Dim i, npages As Integer
            npages = docRenderer.FormattedDocument.PageCount
            ProgressBar1.Maximum = npages


Any help appreciated or an extended sample of the c# in the post above

Many Thanks
C
Author:  Portman [ Sat Feb 18, 2012 5:20 pm ]
Post subject:  Re: Display Gauge for Documentrenderer.preparedocument Progress
Hi
Stepping back for a night helps!! :D
Got desired result by amending code as follows -
Code:
            Dim docRenderer As MigraDoc.Rendering.DocumentRenderer
            docRenderer = New DocumentRenderer(document)
            ' Addhandler to update progressbar
            AddHandler docRenderer.PrepareDocumentProgress, AddressOf UpdateBar
            docRenderer.PrepareDocument()

and then adding the handler subroutine
Code:
    ' UpdateBar has the same signature as PrepareDocumentProgressEventHandler.
    Public Sub UpdateBar(ByVal sender As Object, ByVal e As DocumentRenderer.PrepareDocumentProgressEventArgs)
        Me.ProgressBar1.Maximum = e.Maximum
        Me.ProgressBar1.Value = e.Value
        Me.TextBox1.Text = "Preparing PDF Page " & e.Value.ToString
        System.Windows.Forms.Application.DoEvents()
    End Sub

Not sure if this the most elegant but it worked.

Also limited test showed that total elapsed time to create my 24page pdf file was almost same whether I used
docrenderer with preparedocument and then renderpage
or
PdfDocumentRenderer with PrepareRenderPages and Renderpages
or
PdfDocumentRenderer with Renderdocument

First option has advantage of showing progress in a long running document
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