UDT (User Defined Types) and COM -Struct

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C++

Hi,

I want to add a function to my class in ATL project..while doing so the function has a parameter of struct..this struct needs to be implement in idl.....I am stuck..in VC++ can anyone help as I am a beginner in ATL ...

1)Hav added the following in the .idl file

[ uuid("FD27CE79-9C08-4afa-AEB0-BB5B3E2F6DEA")]
struct xGetPinOutNaw {
 char sDate_Time[MESSAGE_DATE_TIME_LENGTH+1];
 char sRefTransaction_Number[MESSAGE_TXN_SERIAL_LENGTH+1];
 char spincode[MESSAGE_PIN_CODE_LENGTH+1];
 char sSerial_PinNo[MESSAGE_PIN_SERIAL_LENGTH+1];
 char sExpiry_date[MESSAGE_PIN_EXPIRY_LENGTH+1];
 char sPromotion_msg[MESSAGE_FILLER_LENGTH+1];
};

2)hav made a separate idl file with the above info and hav include that in the main .cpp file and the headers aswell...

Not getting a proper approach to go ahead

error:
error MIDL2035 : constant expression expected

Thanks