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PDFsharp - A .NET library for processing PDF & MigraDoc Foundation - Creating documents on the fly
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PostPosted: Mon Jul 23, 2018 10:00 am 
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Joined: Mon Jul 23, 2018 9:45 am
Posts: 3
Hi,

these are my first Steps in Creating an PDF with VB.NET. I think I have some Problems with Understanding the whole Thing, so please be patient. ;)

I have an PDF, which is an Template (only 1 Image as a Background) "back.pdf". I open this as a new pdfDocument and "select" Page(0). Now I try to write something at a specific point of the Document.
But nearly all Tries failed.

So, I copied a snipet from the PDFSharp-Wiki (Under First Page) and I get an Error "the --Operator is not defined for XUnit and Integer" (I have the german Version, so I have to translate - I hope I got it!).

Here is my Code:

Code:
    Private Sub PdfFuellen()
        Dim pdf As PdfDocument = New PdfDocument()
        Dim Ausgabe As String = ""

        pdf = PdfReader.Open("Gfx\back.pdf")
        Dim pdfPage As PdfPage = pdf.Pages(0)
        Dim graph As XGraphics = XGraphics.FromPdfPage(pdfPage)
        Dim font As XFont = New XFont("Andalus", 30, XFontStyle.Regular)
        Ausgabe = "something"
       
        graph.DrawString(Ausgabe, font, XBrushes.Black, New XRect((100, 100, --> pdfPage.Width - 200 <--, 300), XStringFormats.Center)
        Dim pdfFilename As String = "firstpage.pdf"
        pdf.Save(pdfFilename)
        Process.Start(pdfFilename)

    End Sub


I marked the Error with "--> <--".

Could you please help me? What went wrong?

Thx in advance
Michael

[EDIT] The PageSize of this Document is A5 and Landscape. And I use the newest Version of PDFSharp 1.50.4845-rc2a (from nuget.org) - yesterday downloaded and installed.


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PostPosted: Mon Jul 23, 2018 11:57 am 
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Joined: Sat Mar 14, 2015 10:15 am
Posts: 481
Location: CCAA
Hi!

The error message says it all: pdfpage.Width is type "XUnit", but a double is expected.
Maybe try pdfpage.Width.Point (if that's what you want). This will return a double. I guess this is what C# does implicitly.

Edit: Point is Double, not Integer. XRect expects four Double values. Points are not Pixel, so fractions make sense.

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Thomas
(Freelance Software Developer with several years of MigraDoc/PDFsharp experience)


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PostPosted: Mon Jul 23, 2018 6:16 pm 
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Joined: Mon Jul 23, 2018 9:45 am
Posts: 3
Nope, that's unfortunately not the Solution:

Code:
        Dim posY As Integer
        -->posY = pdfPage.Width - 200<--


throws the same Error! And the Error-Message seem to me like the "-" is not an valid Operator.
Strange is, that I just copied the Wiki-Entry and the Error appears.


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PostPosted: Tue Jul 24, 2018 7:47 am 
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PDFsharp Guru
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Joined: Mon Oct 16, 2006 8:16 am
Posts: 2980
Location: Cologne, Germany
Hi!
WarFred wrote:
Nope, that's unfortunately not the Solution
You are not trying the suggested solution, instead you repeat the same error.

To use the suggested solution, you could write:
Code:
graph.DrawString(Ausgabe, font, XBrushes.Black, New XRect((100, 100, --> pdfPage.Width.Point - 200 <--, 300), XStringFormats.Center)

You do not need a variable of type Integer (actually you get a Double, not an Integer), you just have to add ".Point" to obtain a numerical value from the XUnit object.

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Thomas Hoevel
PDFsharp Team


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PostPosted: Tue Jul 24, 2018 8:42 am 
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Joined: Mon Jul 23, 2018 9:45 am
Posts: 3
Hi Thomas,

I misunderstood your Advice, sorry.

Now I changed the Coding and it works!

Thx for Help.
Michael


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