Sunny said:
Hi Jon,
can you post a complete working sample. I can not see any problem here.
Here is the complete code. The problem is in the CreateCheckPCLDelegate
function. When the event is thrown the callback
is reentered over and over again, up to about 4 times before the error
message appears.
'***************************************************************************
******************************************
Class CheckPrintDelegate
Private Const CHECKPRINT_SERVER As String =
"
http://localhost/PrintServices/CheckPrintServicesFBOD.rem"
Delegate Function CreateCheckPCLDelegate(ByRef CheckID As String, ByVal
XOffSet As Integer, ByVal YOffSet As Integer, ByRef PCLStream As Byte(),
ByRef ErrorMessage As String) As Boolean
Private m_xOffSet As Integer
Private m_yOffset As Integer
Private m_sRemoteURL As String
Private m_checkList As New CheckQueueList
Public Event CheckReceived(ByVal CheckID As String)
Private Sub New()
End Sub
Public Sub New(ByVal sRemoteURL As String)
Dim properties As New Hashtable
properties("name") = "HttpBinary"
m_sRemoteURL = sRemoteURL
Try
ChannelServices.RegisterChannel(New HttpChannel(properties, New
BinaryClientFormatterSinkProvider, Nothing))
' The last parameter above (Nothing) is the server sink provider
chain
' to obtain the default behavior (which includes SOAP and
' binary formatters on the server side).
Catch er As System.Runtime.Remoting.RemotingException
If er.Message.IndexOf("already registered") < 0 Then
Throw New ApplicationException(er.Message)
End If
Catch ex As Exception
Debug.WriteLine(ex.ToString)
End Try
End Sub
Public Property XOffset() As Integer
Get
Return (m_xOffSet)
End Get
Set(ByVal Value As Integer)
m_xOffSet = Value
End Set
End Property
Public Property YOffset() As Integer
Get
Return (m_yOffset)
End Get
Set(ByVal Value As Integer)
m_yOffset = Value
End Set
End Property
Public Sub ClearList()
m_checkList.Clear()
End Sub
Public ReadOnly Property CheckList() As CheckQueueList
Get
CheckList = m_checkList
End Get
End Property
Public Function GetDeclineLetterTemplate(ByRef sData As Byte(), ByRef
ErrorMessage As String) As Boolean
Dim objCheckPrintServices As LTSWebChecks.CheckPrintServicesFBOD
Dim bStatus As Boolean
Dim sStream As String
Try
objCheckPrintServices =
CType(Activator.GetObject(GetType(LTSWebChecks.CheckPrintServicesFBOD),
m_sRemoteURL), LTSWebChecks.CheckPrintServicesFBOD)
bStatus = objCheckPrintServices.GetDeclineLetterTemplate(sData,
ErrorMessage)
Catch ex As Exception
Debug.Write(ex.Message)
Throw New ApplicationException("GetDeclineLetterTemplate():" &
ex.Message)
End Try
GetDeclineLetterTemplate = bStatus
End Function
Private Sub CreateCheckPCLCallback(ByVal result As IAsyncResult)
Dim objResult As AsyncResult = CType(result, AsyncResult)
Debug.WriteLine("AsyncResult = " & objResult.IsCompleted.ToString)
Dim objDelegate As CreateCheckPCLDelegate = _
CType(objResult.AsyncDelegate, CreateCheckPCLDelegate)
Dim bStatus As Boolean
Dim sPCLData As Byte()
Dim sCheckID As String
Dim sErrorMsg As String
bStatus = objDelegate.EndInvoke(sCheckID, sPCLData, sErrorMsg,
result)
m_checkList.Item(sCheckID).PCLStream = sPCLData
m_checkList.Item(sCheckID).Completed = True
m_checkList.Item(sCheckID).Errors = sErrorMsg
objDelegate = Nothing
RaiseEvent CheckReceived(sCheckID) '<<<========= Problem
is Here
Debug.WriteLine("Result is <{0}>", bStatus.ToString)
End Sub
Public Function GetMICRFont(ByRef sPCLStream As Byte()) As Boolean
Dim objCheckPrintServices As LTSWebChecks.CheckPrintServicesFBOD
Dim bStatus As Boolean
Try
objCheckPrintServices =
CType(Activator.GetObject(GetType(LTSWebChecks.CheckPrintServicesFBOD),
m_sRemoteURL), LTSWebChecks.CheckPrintServicesFBOD)
bStatus =
objCheckPrintServices.CreateMICRFontPCLStream(sPCLStream)
Catch ex As Exception
Debug.Write(ex.Message)
Throw New ApplicationException("GetMICRFont():" & ex.Message)
End Try
GetMICRFont = bStatus
End Function
Public Function GetTestPCLStream(ByVal CheckID As String, ByRef
sPCLStream As Byte(), ByRef sErrorMessage As String) As Boolean
Dim objCheckPrintServices As LTSWebChecks.CheckPrintServicesFBOD
Dim bStatus As Boolean
Try
objCheckPrintServices =
CType(Activator.GetObject(GetType(LTSWebChecks.CheckPrintServicesFBOD),
m_sRemoteURL), LTSWebChecks.CheckPrintServicesFBOD)
bStatus =
objCheckPrintServices.CreateTestCheckPCLStream(CheckID, m_xOffSet,
m_yOffset, sPCLStream, sErrorMessage)
Catch ex As Exception
Debug.Write(ex.Message)
Throw New ApplicationException("GetTestPCLStream():" &
ex.Message)
End Try
GetTestPCLStream = bStatus
End Function
Public Function GetPCLStream(ByVal CheckID As String, ByRef sPCLStream
As Byte(), ByRef sErrorMessage As String) As Boolean
Dim objCheckPrintServices As LTSWebChecks.CheckPrintServicesFBOD
Dim bStatus As Boolean
Try
objCheckPrintServices =
CType(Activator.GetObject(GetType(LTSWebChecks.CheckPrintServicesFBOD),
m_sRemoteURL), LTSWebChecks.CheckPrintServicesFBOD)
bStatus = objCheckPrintServices.CreateCheckPCLStream(CheckID,
m_xOffSet, m_yOffset, sPCLStream, sErrorMessage)
Catch ex As Exception
Debug.Write(ex.Message)
Throw New ApplicationException("GetPCLStream():" & ex.Message)
End Try
Return (bStatus)
End Function
Public Sub QueuePCLStream(ByVal CheckID As String)
Dim objCallback As New AsyncCallback(AddressOf
CreateCheckPCLCallback)
Dim objCheckPrintServices As LTSWebChecks.CheckPrintServicesFBOD
Dim result As IAsyncResult
Dim sPCLStream As Byte()
Dim sErrorMsg As String
Try
objCheckPrintServices =
CType(Activator.GetObject(GetType(LTSWebChecks.CheckPrintServicesFBOD),
m_sRemoteURL), LTSWebChecks.CheckPrintServicesFBOD)
Dim objDelegate As New CreateCheckPCLDelegate( _
AddressOf objCheckPrintServices.CreateTestCheckPCLStream)
'For Debuggin, Change from Test
m_checkList.Add(CheckID, Nothing, Nothing, False)
result = objDelegate.BeginInvoke(CheckID, m_xOffSet, m_yOffset,
sPCLStream, sErrorMsg, objCallback, _
Nothing)
'm_checkList.Add(CheckID, Nothing, Nothing, False)
Catch ex As Exception
Debug.Write(ex.Message)
Throw New ApplicationException("QueuePCLStream():" & ex.Message)
End Try
End Sub
Public Function GetQueuedCheckData(ByVal checkID As String) As
CheckQueueItem
'Note: This is a Volatile Get Function. It will return the
CheckQueueItem
' and then remove it from the list
GetQueuedCheckData = m_checkList.Item(checkID)
m_checkList.Remove(checkID)
End Function
End Class
