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Conference bulova::decw_jan-89_to_nov-90

Title:DECWINDOWS 26-JAN-89 to 29-NOV-90
Notice:See 1639.0 for VMS V5.3 kit; 2043.0 for 5.4 IFT kit
Moderator:STAR::VATNE
Created:Mon Oct 30 1989
Last Modified:Mon Dec 31 1990
Last Successful Update:Fri Jun 06 1997
Number of topics:3726
Total number of notes:19516

2026.0. "Customer written DECwindows extensions on ULTRIX" by GOLLY::MILLER (I need 'Deeper Understanding') Wed Jan 10 1990 15:49

I understand how I (internally) or a customer would go about building
a DECwindows Extension on VMS since it can be a dynamically loaded
image.

But exactly how do I (or more importantly a customer) go about
building a DECwindows Server Extension for ULTRIX?

Pointers/contact names most appreciated!

Thanks,

                  == ken miller ==
T.RTitleUserPersonal
Name		DateLines
2026.1pointer..SUBWAY::GRAHAMif ya want home cookin, stay homeSat Feb 03 1990 23:478
    
    >But exactly how do I (or more importantly a customer) go about
    >building a DECwindows Server Extension for ULTRIX?
    
    You can try gilroy::(chris)kent for some ideas - how
    the Display Postscript extension was done.
    
    Kris..
2026.2Customers *don't* write DW Extensions ;(GOLLY::MILLERI need 'Deeper Understanding'Sun Feb 04 1990 06:3327
    <<< Note 2026.1 by SUBWAY::GRAHAM "if ya want home cookin, stay home" >>>
                                 -< pointer.. >-
    
    Thanks Kris.  I was curious about Display Postscript, but didn't know
    who to contact.
    
    I got in touch with Product Management gilroy::(john)hall and found out
    that it's basically "you *can't* (very easily)"!
    
    So...I submitted Phase 0 requirements for V4.next to support this.
    
    Customers and layered products (like us) are just gonna *have* to have
    this in the future if they're gonna have any hope in supporting
    multiple DECwindows hardware/software!
    
    P.S. Turns out it's not even terribly easy on VMS since you have to
    rely on structures (client struct in particular) that are typedef'd in
    header files which aren't normally provided.  Thus, if these change out
    from under you (like they just did between VMS V5.3 and V5.3-1), you're
    suddenly incompatible!
    
    Regards,
    
    	 	== ken miller ==
    		DEC/Test Manager Development
2026.3DECWIN::FISHERBurns Fisher 381-1466, ZKO3-4/W23Mon Feb 05 1990 13:047
Just fyi, one of the reasons that customer-writable extensions are HARD
in both VMS and Ultrix is because we are between the rock and the hardplace
on the interface.  On the one hand, we want our interface to be similar to MIT
to enable us to get extensions that appear there.  On the other hand, MIT refuses
to define a stable extension interface, so we can't document one for ours.

Burns