JoinCommonContext Method

Imports Leadtools
      Imports Leadtools.Ccow
      Imports Leadtools.Ccow.UI

      Private ApplicationName As String = "LEADTOOLS CCOW App"
      <Test> _
      Public Sub JoinCommonContext()
         Dim contextManager As IContextManager = Utils.COMCreateObject(Of IContextManager)(CcowProgId)
         Dim participant As ContextParticipant = New ContextParticipant()
         Dim coupon As Integer = 0

         Try
            coupon = contextManager.JoinCommonContext(participant, ApplicationName, True, False)

            '
            ' Set Patient Context
            '
            SetPatientContext(contextManager, coupon)

            '
            ' Get Patient Context
            '
            GetPatientContext(contextManager, coupon)

            contextManager.LeaveCommonContext(coupon)
         Catch e As Exception
            Debug.WriteLine(e.Message)
         End Try
      End Sub

      Public Sub SetPatientContext(ByVal contextManager As IContextManager, ByVal coupon As Integer)
         Dim patientSubject As Subject = New Subject("Patient")
         Dim contextData As IContextData = TryCast(contextManager, IContextData)
         Dim transactionCoupon As Integer = 0
         Dim noContinue As Boolean = True, disconnect As Boolean = False
         Dim reasons As Object
         Dim decision As String = "accept"

         patientSubject.Items.Add(New ContextItem("Patient.id.mrn", "123456789"))
         patientSubject.Items.Add(New ContextItem("Patient.co.Patientname", "Doe^John^^^"))

         Try
            transactionCoupon = contextManager.StartContextChanges(coupon)
            contextData.SetItemValues(coupon, patientSubject.ToItemNameArray(), patientSubject.ToItemValueArray(), transactionCoupon)
            reasons = contextManager.EndContextChanges(transactionCoupon, noContinue)

            '
            ' If any application responded that they cannot apply the change we need to display
            ' a dialog that displays the reasons for the problems.
            '
            If (Not reasons Is Nothing AndAlso (CType(reasons, String())).Length > 0) OrElse noContinue Then
               Dim pd As ProblemDialog = New ProblemDialog(CType(reasons, String()), noContinue)
               Dim result As DialogResult

               result = pd.ShowDialog()
               If noContinue Then
                  decision = "cancel"
               End If
               If result = System.Windows.Forms.DialogResult.OK Then
                  decision = "accept"
               ElseIf result = DialogResult.Cancel Then
                  decision = "cancel"
               Else
                  decision = "cancel"
                  disconnect = True
               End If
            End If

            contextManager.PublishChangesDecision(transactionCoupon, decision)

            '
            ' If user decided to break context we must leave
            '
            If disconnect Then
               contextManager.LeaveCommonContext(coupon)
            End If
         Catch e As Exception
            Debug.WriteLine(e.Message)
         End Try
      End Sub

      Public Sub GetPatientContext(ByVal contextManager As IContextManager, ByVal coupon As Integer)
         Dim contextData As IContextData = TryCast(contextManager, IContextData)
         Dim data As Object = Nothing

         Try
            data = contextData.GetItemNames(contextManager.MostRecentContextCoupon)
            If data.GetType() Is GetType(String() ) AndAlso (CType(data, String())).Length > 0 Then
               Dim names As String() = CType(data, String())

               For Each name As String In names
                  Debug.WriteLine(name)
               Next name
               data = contextData.GetItemValues(data, False, contextManager.MostRecentContextCoupon)
               If data.GetType() Is GetType(Object() ) Then
                  Dim values As Object() = CType(data, Object())

                  Dim i As Integer = 0
                  Do While i < values.Length
                     Debug.Write(values(i).ToString())
                     Debug.Write("     ")
                     Debug.WriteLine(values(i + 1).ToString())
                     i += 2
                  Loop
               End If
            End If
         Catch e As Exception
            Debug.WriteLine(e.Message)
         End Try
      End Sub

        <ComVisible(True)> _
        Public Class ContextParticipant
            Implements IContextParticipant
#Region "IContextParticipant Members"

            Public Sub CommonContextTerminated() Implements IContextParticipant.CommonContextTerminated
                Console.WriteLine("CommonContextTerminated")
            End Sub

            Public Sub ContextChangesAccepted(ByVal contextCoupon As Integer) Implements IContextParticipant.ContextChangesAccepted
                Console.WriteLine("ContextChangesAccepted")
            End Sub

            Public Sub ContextChangesCanceled(ByVal contextCoupon As Integer) Implements IContextParticipant.ContextChangesCanceled
                Console.WriteLine("ContextChangesCanceled")
            End Sub

            Public Function ContextChangesPending(ByVal contextCoupon As Integer, ByRef reason As String) As String Implements IContextParticipant.ContextChangesPending
                reason = String.Empty
                Console.WriteLine("ContextChangesPending")
                Return "accept"
            End Function

            Public Sub Ping() Implements IContextParticipant.Ping
            End Sub

#End Region
        End Class