See ReceiveRtDataMessage, GetRtLongDataMessage

Syntax

typedef struct longMessageDesc { 
    LOCATION location; 
    DWORD msgId; 
    DWORD reserved1; 
    DWORD dwUserParam; 
    DWORD length; 
    DWORD reserved; 
    DWORD reserved2; 
} MSG_DESCRIPTOR, *LPMSG_DESCRIPTOR; 

Fields

location 

Location of the sender.

dwUserParam

Value of parameter passed by user to SendRtLongDataMessage.

length 

Length of long message.

All other fields are for internal use only. Do not change any of the fields in this structure.