getting exceptions when trying to parse hl7 messages containing large data in obx-5

[AlexFJaxFL]

getting the following exception when parsing files containing large embedded images:

Parse error in DoEDieIn: NHapi.Base.DataTypeException: Failed validation rule: Maxumim size <= 65536 characters at NHapi.Base.Model.Varies.fixOBX5(ISegment segment, IModelClassFactory factory) at NHapi.Base.Parser.PipeParser.Parse(ISegment destination, String segment, EncodingCharacters encodingChars) at NHapi.Base.Parser.PipeParser.DoParse(String message, String version) at NHapi.Base.Parser.ParserBase.Parse(String message, String version) at EPDHL7ListenerSvc2.EPDHL7ListenerSvc2.TryParseMessage(String HL7Message).

not sure if this limitation is to be expected or maybe it will be resolved in future versions

Regards, Alex

[milkshakeuk]

hi @AlexFJaxFL do you have any example code?

[milkshakeuk]

also @AlexFJaxFL might be worth checking #105 to see if this issue is similar or not?

[AlexFJaxFL]

hi @AlexFJaxFL do you have any example code?

Public Shared Function ParseHL7Messages(HL7Messages As String, FType As FeedType) As Boolean Dim MsgType As String = "" Dim SendingApp As String = "" Dim iEPDFacNo As Integer = 0

    Try
        FieldSeparator = HL7Messages(3)
        ComponentSeparator = HL7Messages(4)

        Dim HL7MessageName As String = ""

        If Not HL7Messages.StartsWith("MSH") Then
            If blnInService = True Then 'if running in the service
                WriteEventLog("Error in ParseHL7Messages: does not start with MSH " & vbCrLf & HL7Messages, EventLogEntryType.Error)
            Else
                Dim ex As New Exception("Error in ParseHL7Messages: does not start with MSH " & vbCrLf & HL7Messages)
                Throw ex
            End If
        End If

        Dim prsr As New Parser.PipeParser()
        Dim imsg As Model.IMessage = Nothing
        Dim trsr As Util.Terser
        Dim blnFilterOut As Boolean = False

        For Each strMsg In HL7Messages.Split(New String() {"MSH|"}, StringSplitOptions.RemoveEmptyEntries)
            strMsg = "MSH|" & strMsg 'add the split chars back on.

            'If prsr.GetMessageStructure(strMsg) = "ORU_R01" Then
            strMsg = SetOBX2DataType(strMsg) '
            'End If

            Try
                imsg = prsr.Parse(strMsg)
            Catch ex As Exception
                Try
                    EPDnHapi.SetPtrnFindReplace(strMsg)
                    imsg = prsr.Parse(strMsg)
                Catch ex1 As Exception
                    If strMsg.Contains("ORU^R01") OrElse strMsg.Contains("ORM^O01") Then ' for IB ORU/ORM clearing OBR-13 since not needed 
                        EPDnHapi.ClearField(strMsg, "OBR|", 13)  ' and causing problems for parser (AF)
                        Try
                            imsg = prsr.Parse(strMsg)
                        Catch ex2 As Exception
                            imsg = prsr.Parse(strMsg, "2.4")
                        End Try
                    End If
                End Try
            End Try

[AlexFJaxFL]

also @AlexFJaxFL might be worth checking #105 to see if this issue is similar or not?

i can see there is certain correlation between my issue and discussion that took place in #105, my data looks like this:

[AlexFJaxFL]

maybe this structure does not match what your engine parser is expecting ..

[milkshakeuk]

Hi @AlexFJaxFL we have some unit tests showing how it should look, https://github.com/nHapiNET/nHapi/blob/a9f42181815e035383120540160d470c03f60918/tests/NHapi.Benchmarks/LargeEmbeddedFileTest.cs#L23 There is also this blog which might help. http://healthbase.info/blog/?p=376

[AlexFJaxFL]

Ok, this information is very helpful indeed and will be used for .pdf related feeds which we have plenty. What approach should I use if incoming hl7 message contains .rtf content in obx-5 the way I demonstrated above ?

[milkshakeuk]

@AlexFJaxFL I think you can use a similar approach to the pdf for rtf files.