' The project, which uses this code, must have references to the following assemblies:
' - Vintasoft.Imaging
' - Vintasoft.Imaging.Pdf

''' <summary>
''' Verifies a PDF document to conformance with PDF/A-1b specification.
''' </summary>
''' <param name="pdfFilename">The filename of PDF document.</param>
Public Shared Sub VerifyDocumentToPdfA1b(pdfFilename As String)
        Dim verifier As New Vintasoft.Imaging.Pdf.Processing.PdfA.PdfA1bVerifier()
        System.Console.WriteLine("Verification...")
        If verifier.Verify(pdfFilename) Then
                System.Console.WriteLine("Document conforms to PDF/A-1b.")
        Else
                System.Console.WriteLine("Document does not conform to PDF/A-1b.")
        End If
End Sub

' The project, which uses this code, must have references to the following assemblies:
' - Vintasoft.Imaging
' - Vintasoft.Imaging.Pdf

''' <summary>
''' Verifies a PDF document to conformance with PDF/A-1b specification and
''' shows the detailed result of verification.
''' </summary>
''' <param name="pdfFilename">The filename of PDF document.</param>
Public Shared Sub VerifyDocumentToPdfA1bDetailed(pdfFilename As String)
        Dim verifier As New Vintasoft.Imaging.Pdf.Processing.PdfA.PdfA1bVerifier()
        Using processingState As New Vintasoft.Imaging.Processing.ProcessingState()
                ' subscribe to the events for monitoring the progress and activated important triggers
                AddHandler processingState.Progress, New System.EventHandler(Of Vintasoft.Imaging.ProgressEventArgs)(AddressOf verifyProcessingState_Progress)
                AddHandler processingState.TriggerActivated, New System.EventHandler(Of Vintasoft.Imaging.Processing.TriggerActivatedEventArgs)(AddressOf verifyProcessingState_TriggerActivated)
                ' clear the count of important trigger activations
                _verifyActivatedTriggerCount = 0

                ' execute the verification
                Dim result As Vintasoft.Imaging.Processing.VerificationProfileResult = verifier.Verify(pdfFilename, processingState)

                ' output the verification result

                System.Console.WriteLine("finished.")
                If result.IsPassed Then
                        System.Console.WriteLine("Document conforms to PDF/A-1b.")
                Else
                        System.Console.WriteLine("Document does not conform to PDF/A-1b:")
                        ' for each activated trigger
                        For Each command As Vintasoft.Imaging.Processing.IProcessingCommandInfo In result.ActivatedTriggers.Keys
                                ' output information about activated trigger
                                System.Console.WriteLine(String.Format("  {0} ({1} matches)", command, result.ActivatedTriggers(command).Count))

                        Next
                End If
        End Using
End Sub

''' <summary>
''' The count of trigger activations.
''' </summary>
Shared _verifyActivatedTriggerCount As Integer

''' <summary>
''' Handles the TriggerActivated event of the ProcessingState.
''' </summary>
Private Shared Sub verifyProcessingState_TriggerActivated(sender As Object, e As Vintasoft.Imaging.Processing.TriggerActivatedEventArgs)
        If e.ActivationResult.Severity = Vintasoft.Imaging.Processing.TriggerSeverity.Important Then
                _verifyActivatedTriggerCount += 1
        End If
End Sub

''' <summary>
''' Handles the Progress event of the ProcessingState.
''' </summary>
Private Shared Sub verifyProcessingState_Progress(sender As Object, e As Vintasoft.Imaging.ProgressEventArgs)
        System.Console.CursorLeft = 0
        If _verifyActivatedTriggerCount > 0 Then
                System.Console.Write(String.Format("Verification {0}%: {1} errors...", e.Progress, _verifyActivatedTriggerCount))
        Else
                System.Console.Write(String.Format("Verification {0}%...", e.Progress))
        End If
End Sub