Knowledgebase

Articles List
  • KB71
  • Jul 06, 2023 10:09 AM

I have a problem with PXC_SignDocumentW in VB.NET

Problem:

I have a problem with PXC_SignDocumentW.

I spent several hours trying to make any of the PXC_SignDocumentXXX functions work.

I have a simple test scenario; create a new PDF document, add a new page and a picture on the page (our intention is to use PDF for e-archiving of scanned documents). Then I add another new page to put the signature on and try to sign the document - which fails.
Without trying to sign the document, I am able to save it and view it in the Adobe Reader.

My 1. approach - using PXC_SignDocumentW

<DllImport("pxclib40")> _
Public Function PXC_SignDocumentW( _
ByVal pdf As Integer _
, ByVal PCertt As IntPtr _
, ByVal page As Integer _
, ByVal rect As PXC_RectF _
, <MarshalAs(UnmanagedType.LPWStr)> ByVal lpwszReason As String _
, <MarshalAs(UnmanagedType.LPWStr)> ByVal lpwszLocation As String _
, <MarshalAs(UnmanagedType.LPWStr)> ByVal lpwszContactInfo As String _
, <MarshalAs(UnmanagedType.LPWStr)> ByVal lpwszImageFile As String _
, ByVal dwFlags As Integer _
) As Integer
End Function

Dim cert As New X509Certificate2("123pass123456.pfx", "123456")
PXC_SignDocumentW( _
myPdfDoc _
, cert.Handle _
, myPage _
, pageSize _
, "test" _
, "anywhere" _
, "test@test" _
, "" _
, 0) _

 fails with an AccessViolationException

Resolution:

The problem was in the PXC_SignDocumentW function declarations: 

where the rectangle should be passed by reference:

ByVal rect As PXC_RectF  ' wrong - does not work
ByRef rect As PXC_RectF  ' works fine
 

<DllImport("pxclib40")> _
Public Function PXC_SignDocumentUsingW( ... )

Was this article helpful?
Yes No Somewhat

Error

    Thanks for your feedback!

    More Like This

    Need more information? Get in touch.

    You can contact us by phone, email or our social media accounts — we are here to assist you.

    Contact Us
    We serve cookies.

    Cookies are necessary in order to enable you to move around the website and use its features, including making purchases through our online store. We need cookies in order to determine the number of unique users who visit the site, and to provide certain features, such as the login functionality.
    We do not use cookies for advertising purposes.
    By clicking "Accept" (or continuing to use the site) you are agreeing to our use of these tools. Learn More