• Subject: Retrieve Dynamic IP Addresses via the QDCRDEVD API
  • From: Jeffrey Stevens <jssteven@xxxxxxxxxx>
  • Date: Wed, 22 Oct 1997 08:53:47 -0400


Is there any interest in this kind of information?  It was published in
NEWS/400...they have a link to the code.  It's under
http://www.news400.com/code/newscode/code9709.exe.

I should mention, the following is only one possiblity when retrieving the IP
address, you can do other things like switch your interactive job to another
subsystem, etc.

Retrieve Dynamic IP Addresses via the QDCRDEVD API
--------------------------------------------------
by Jeff Stevens

AS/400 TCP/IP now supplies essential application print support to help control
and direct printing over TCP/IP networks.  This support is supplied in an
enhancement to the Retrieve Device Description (QDCRDEVD) API that lets
applications retrieve IP addresses of Telnet clients.

The QDCRDEVD API now supports additional fields for Telnet devices, such as
IBM's Network Station and other types of display devices.  Thus, you can use
the API to retrieve a Telnet display device description, which includes the IP
address, to direct printing to a particular device for that client.

To use the new fields, you must add them to the existing record format
DEVD0600, which indicates a display device.  The table in Figure 1 lists the
new fields, formats, and descriptions.  These new fields can also be seen in
the DEVD0600_t structure in the code example.  You also must apply the
following PTFs, depending on the OS/400 release you use (PTFs will be included
in the base code for subsequent releases):

PTF's Required
--------------
V3R2
5763TC1:  SF38885
5763SS1:  SF38876, SF38688, SF38886
(PTF Cover letter SF38876 describes API field offsets)

V3R7
5763TC1: SF38535
5763SS1: SF37172, SF38357, SF38536
(PTF cover letter SF38565 describes API field offsets)

Sample Program
--------------
I've written a C program - QRMTWTR.C - that shows how to use the QDCRDEVD API
Telnet enhancements to let a Telnet client set the queue and IP address of the
default print output queue based on the client's IP address.

Jeff Stevens - AS/400 TCP/IP Applications (LPD/WSG/Telnet)
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