HP Data Entry and Forms Management System (VPLUS) Reference Manual (32209-90024)
642 AppendixK
SNA DHCF with VPLUS Applications
Using VPLUS Intrinsics With DHCF
Using VPLUS Intrinsics With DHCF
From the group of all available VPLUS intrinsics, SNA DHCF does not support two of the
intrinsics when they are run on IBM 3270 display stations. Six of the intrinsics can be
used, but are altered because of IBM 3270-related differences. The remaining intrinsics
can be used in the same manner as for an application to be run on HP terminals. The
following sections discuss unsupported intrinsics and those that are affected by IBM 3270
differences.
Unsupported Intrinsics
If a VPLUS application calls an intrinsic unsupported for IBM 3270 display stations
during an SNA DHCF session, you must modify the application before it can run
successfully. Otherwise, the intrinsic may not function, or it may return an error message.
The following intrinsics are not supported at this time.
VPRINTFORM Generates an error when called. This intrinsic is dependent on an ASCII
screen image, but the screen image on an IBM 3270 is EBCDIC.
VPRINTSCREEN Generates an error when called.
In addition to these unsupported intrinsics, SNA DHCF does not support VPLUS internal
routines called directly by an application.
Intrinsics Altered With SNA DHCF
The following intrinsics function differently for IBM 3270 display stations than for HP
terminals.
VCHANGEFIELD HP enhancement types map dynamically to IBM 3270
enhancement types.
VOPENTERM The identifier is set to the IBM 3270 display station type
(80; reserves 80-85 for 327x terminal types).
VPUTWINDOW The message can contain up to 79 printable characters.
Messages longer than this are truncated. Unprintable
characters are removed.
VREADFIELDS The
lastkey
parameter in the
comarea
contains the value
that corresponds to the mapping of an IBM 3270 function
key to an HP function key.
VSETERR The message can contain up to 79 printable characters.
Messages longer than this are truncated. Unprintable
characters are removed.
VSHOWFORM Uses
showcontrol
bits as for a non-caching, MDT,
non-touch terminal. Enhancements are mapped to those
available on an IBM 3270 display station. The following
limitations apply:
• The commands "Repeat/Append forms" do not roll a