Using GDViewer in Windows Service

[jstark]

I am having a problem with GDViewer. I am getting the following exception:

"System.AccessViolationException: Attempted to read or write protected memory. This is often an indication that other memory is corrupt."

The following sample code seems to generate this error with every pdf I try. Is there a better method for dynimically creating the viewer when you are using it in a windows service where a form is not available. Is there a way to return the page count in the Imaging object?

Code: Select all

Imports GdPicturePro5
Public Class Sample
     Private objGDViewer As Object
     Private Sub CountPages()
          Try
               objGDViewer = CreateObject("gdpicturepro5.GdViewer")
               Me.objGDViewer.SetLicenseNumber(strKey)
               Me.objGDViewer.SilentMode = True
               If File.Exists(strPath) Then
                     Me.objGDViewer.DisplayFromPDFFile(strPath)
                     Me.lblPageCount.Text = Me.objGDViewer.PageCount
               End If
          Finally
               If Not IsNothing(objGDViewer) Then
                   System.Runtime.InteropServices.Marshal.ReleaseComObject(objGDViewer)
               End If
          End Try
     End Sub
End Class


Thanks

[jstark]

HELP

[Loïc]

Hi,

I can't reproduce the problem, I need more details.

Please, send me a tiny application raising the error at esupport (at) gdpicture (dot) com.

Best regards,

Loïc

[dcreeron]

Looking at your code it appears your aren't closing the image that you've loaded in the viewer.

Code: Select all

Imports GdPicturePro5
Public Class Sample
     Private objGDViewer As Object
     Private Sub CountPages()
          Try
               objGDViewer = CreateObject("gdpicturepro5.GdViewer")
               Me.objGDViewer.SetLicenseNumber(strKey)
               Me.objGDViewer.SilentMode = True
               If File.Exists(strPath) Then
                     Me.objGDViewer.DisplayFromPDFFile(strPath)
                     Me.lblPageCount.Text = Me.objGDViewer.PageCount
                     ' *******
                     Me.objGDViewer.CloseImage()  ' Close the image you've loaded
                     ' *******
               End If
          Finally
               If Not IsNothing(objGDViewer) Then
                   System.Runtime.InteropServices.Marshal.ReleaseComObject(objGDViewer)
               End If
          End Try
     End Sub
End Class


Try adding a call to CloseImage, that should solve the issue.