User`s guide

Contents cxlvii
APPENDIX D
This appendix lists and defines the query reply structures supported by the Windows HLLAPI
structured field interface. See the IBM 3270 Information Display System Data Stream Programmer’s
Guide for additional information on Query Reply Data Structures.
1. WinHLLAPI must scan the query reply buffers to locate the destination/origin
ID (DOID) self-defining parameter (SDP) for the structured field support to
work and be reliable. The DOID field is then filled in with the assigned ID.
2. The application should build the query reply data structures in the application’s
private memory.
3. Only cursory checking is performed on the query reply data. Only the ID and the
length of the structure are checked for validity.
4. The 2-byte length field at the beginning of each query reply is not byte-reversed.
5. Only one distributed data management (DDM) base-type connection is allowed
per host session. If the DDM connection supports the SDP for the DOID, then
multiple connections are allowed.
6. If a nonzero return code is received indicating that an application is already
connected to the selected session (RC 32 or 39), use of that presentation space
should be with caution. Conflicts file transfer and other Windows HLLAPI
applications may result.
Query Reply Data Structures for
Windows HLLAPI