[Progress Communities] [Progress OpenEdge ABL] Forum Post: A CHARACTER or LONGCHAR variable passed as an OUTPUT parameter to a DLL cannot be the Unkno

[Venky]

I have the above error when I try using below dll call. DEFINE VARIABLE ServerInfo AS LONGCHAR NO-UNDO. DEFINE VARIABLE RequestInfo AS LONGCHAR NO-UNDO. DEFINE VARIABLE ResponseInfo AS LONGCHAR NO-UNDO. RUN Test1(ServerInfo, RequestInfo, OUTPUT ResponseInfo). PROCEDURE Test1 EXTERNAL 'Test.dll': DEFINE INPUT PARAMETER serverInfoJson AS CHARACTER NO-UNDO. DEFINE INPUT PARAMETER messageJson AS CHARACTER NO-UNDO. DEFINE RETURN PARAMETER ResponseMessage AS CHARACTER NO-UNDO. END PROCEDURE. What is the problem?

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