Why nHapi sometimes parses a message as a generic message

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0 # RomanShade 2011-09-14 16:27

This doesn't work for me ... I added the third component, but it still returns GenericMessage+ V24 ... any other ideas that can cause this? I've verified the message is valid in HL7 Browser. I'm at a loss.

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+1 # Bas 2011-09-14 16:47

Hi RomanShade,

I'm sorry to hear that it doesn't solve your problem. Could you post the message header segment (MSH)? Maybe we can help you solve the problem.

Bas

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+1 # RomanShade 2011-09-14 21:19

I solved the problem ... sorta. The cause is the message event type (ADT_A08). Apparently, there is no implementation for an A08 in 2.4? If it's any other event type, A01, A03, etc., it works as expected.

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+2 # Bas 2011-09-15 08:36

Hi RomanShade,

HL7 version 2.4 differs from previous version. In 2.4 the A08 event is a kind of subtype of the ADT_A01 event.

The header should look like this:
MSH|^~&|SomeApp||||20110215100411||ADT^A08^ADT_A 01|11873630|P^T|2.4|||AL|EN

This way nHapi will parse the message as an ADT_A01 type object. If you have parsed is to an object you can do the following to get the 'sub-event':
string eventType = message.MSH.MessageType.TriggerEvent.Value;

This will result in "A08" with the header as described above.

So to parse the message do something like this (with the header as described above):
PipeParser hl7Parser = new PipeParser();
IMessage hl7Message = hl7Parser.Parse(message);
if (hl7Message.Version == "2.4")
{
if (hl7Message.Message.GetStructureNam e() == "ADT_A01")
{
ADT_A01 message = (ADT_A01) hl7Message;
// now you can determine if it's an A08 type
if (message.MSH.MessageType.TriggerEvent.Value == "A08")
{
// Do something with the A08 event
}
}
}

The ADT_A01 in version 2.4 contains different A?? events. For example A08, A01, A04 and A13. All these 'sub-events' use the same message structure. Of course, if you want to handle multiple types you have to rewrite the code I've posted here.

Hope this is helpfull!

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0 # RomanShade 2011-09-16 14:42

VERY helpful. Thank you sir!

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+1 # Bas 2011-09-16 15:02

Glad I could help! You're welcome! :lol:

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+1 # GeekMasterzero 2012-04-26 05:45

This also happen in v2.5 and 2.5.1 if you look at the file EventMap.properties it actually show that an A04 and A08 map to A01. this is because the code for nhapi has customised. you can use the solution above, or purchase the HL7 db's from HL7.org and regenerate the class's your self or you can clone the following files:
ADT_A01_INSURANCE.cs
ADT_A01_PROCEDURE.cs
ADT_A01.cs and find and replace "ADT_A01" with "ADT_A04" recompile and your done.
*Note*
if you purchase the the DB's these classes are not missing

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0 # Bas 2012-04-26 08:06

Hi GeekMasterZero,

Thank you for your input. This is a good solution for this problem. Of course that is if you have the budget. ;-)

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