This Chapter discusses SNA IMF's programmatic access
mode, which allows your programs on the HP 3000 to communicate with
programs on an IBM host. SNA IMF's programmatic access
mode consists of a set of intrinsics, or subroutines, that you can
call from HP 3000 programs written in the following languages: BASIC,
COBOL, COBOL II, FORTRAN, Pascal, and SPL. In addition to these
languages, SNA IMF/XL also supports C.
SNA IMF intrinsics allow your programs to read IBM 3270-type
data stored in an internal screen image within the HP 3000. By communicating
through intrinsics, your program looks to the IBM host like an IBM
3278 display station or IBM 3287 printer connected to a remote IBM
cluster controller.
This Chapter contains the following sections:
Types of Intrinsics: Wait
and No-Wait I/O describes the two types of MPE I/O and
lists the intrinsics used with each type.
Transparent and Non-Transparent Modes describes
the transparent and non-transparent modes of running SNA IMF.
Native Mode and Compatibility Mode describes
the two modes in which an application can be compiled on MPE XL.
It explains the differences between the two modes when compiling
an SNA IMF application.
Understanding Intrinsic Result Codes explains
how to handle the result parameter returned by SNA IMF intrinsics.
Understanding Host Screen Formats explains
how to handle the different screen formats when communicating with
IBM host applications.
IBM 3278 Screen Layout explains
how the layout of the SNA IMF internal screen image differs from
the layout of an IBM 3278 display station screen.
Intrinsic Calling Sequences gives
some example calling sequences for SNA IMF intrinsics.
Chapter 3 “Intrinsics Used with Standard MPE
I/O” and Chapter 4 “Intrinsics Used with No-Wait I/O” describe
the SNA IMF intrinsics in detail.
In addition to programmatic access mode, you can use Pass
Thru mode to communicate interactively with an IBM host
and its application programs. See Using SNA IMF Pass
Thru for more information about Pass Thru.
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 | NOTE: On MPE XL, your application programs that call SNA IMF
intrinsics may be in either native mode or compatibility mode. However,
if your applications are written in BASIC or COBOL, the SNA IMF
intrinsic calls in native mode are different from those in compatibility
mode. See "Native Mode and Compatibility Mode," later
in this Chapter, for more information on native mode and compatibility
mode. |
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