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<H1>Re: [MUD-Dev] Dynamic Loading of Modules</H1>
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<LI><em>To</em>: <A HREF="mailto:mud-dev#null,net">mud-dev#null,net</A></LI>
<LI><em>Subject</em>: Re: [MUD-Dev] Dynamic Loading of Modules</LI>
<LI><em>From</em>: "Jon A. Lambert" <<A HREF="mailto:jlsysinc#ix,netcom.com">jlsysinc#ix,netcom.com</A>></LI>
<LI><em>Date</em>: Sun, 22 Mar 1998 14:34:54 -5</LI>
<LI><em>Reply-to</em>: <A HREF="mailto:jlsysinc#ix,netcom.com">jlsysinc#ix,netcom.com</A></LI>
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<PRE>
On 21 Mar 98 at 10:21, Chris Gray wrote:
> [Niklas Elmqvist:]
>
> :Yes, I do know that Windows has dynamically linked libraries, just like
> :Sun and Linux and whatnot (I think they had that *before* it went
> :32-bit, however). However, I suppose you did not read the earlier
> :part (this may be blamed on my too-active-snippage), where I explained
> :about my "discovery" where a server binary with a base class called aClass
> :could dynamically load a module which implemented a subclass of aClass
> :called bClass and *still* use the bClass (as a reference to an aClass
> :object, of course, using polymorphism) even though the server had no idea
> :of its existence at compile-time. (Phew.) According to my RL friend (I
> :have no personal experience in this), this scheme is impossible to
> :implement using Windows DLLs -- I believe he tried after hearing me
> :explain about it.
>
> Well, I hate to think I'm becoming knowledgeable about Windows, but I
> guess its actually true. A co-worker and I have been playing with a small
> DLL on NT, and the debugger and paging interfaces. We haven't been using
> C++, however, just C, so there may be some extra stuff we haven't noticed.
>
> In order to get your dynamic stuff working right, you have to (of course)
> ensure that the main code and the dynamic code are compiled by the same
> compiler, so that the mangled names come out right. You also normally
> use the '__cdecl(dllexport)' magic word with DLL entry points. So, you
> would need the partner '__cdecl(dllimport)' on the declaration of the
> function pointers you use.
I have only played with this stuff in C++, specifically BorlandC++.
I know that Visual C++ 4.1 and earlier did not support the _import
keyword. Most of the items Nicklas mentions are more compiler
dependent than OS dependent. Prologue and epilogue code (vtables)
are generated by the compiler to handle run-time polymorphism, thus,
while it can be done in C, you will be writing this code yourself.
All modules must be prepared with the same compiler.
--
--/*\ Jon A. Lambert - TychoMUD Internet:jlsysinc#ix,netcom.com /*\--
--/*\ Mud Server Developer's Page <<A HREF="http://www.netcom.com/~jlsysinc">http://www.netcom.com/~jlsysinc</A>> /*\--
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<LI><STRONG><A NAME="00808" HREF="msg00808.html">Re: [MUD-Dev] Dynamic Loading of Modules</A></STRONG>
<UL><LI><EM>From:</EM> cg#ami-cg,GraySage.Edmonton.AB.CA (Chris Gray)</LI></UL></LI>
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<ul><li>Thread context:
<BLOCKQUOTE><UL>
<LI><STRONG>Re: [MUD-Dev] World Persistence, flat files v/s DB v/s ??</STRONG>, <EM>(continued)</EM>
<ul compact>
<LI><strong><A NAME="00857" HREF="msg00857.html">Re: [MUD-Dev] World Persistence, flat files v/s DB v/s ??</A></strong>,
J C Lawrence <a href="mailto:claw#under,engr.sgi.com">claw#under,engr.sgi.com</a>, Mon 23 Mar 1998, 20:41 GMT
</LI>
</ul>
</LI>
<LI><strong><A NAME="00809" HREF="msg00809.html">Re: [MUD-Dev] Parlez vous NPC?</A></strong>,
Chris Gray <a href="mailto:cg#ami-cg,GraySage.Edmonton.AB.CA">cg#ami-cg,GraySage.Edmonton.AB.CA</a>, Sat 21 Mar 1998, 18:10 GMT
<UL>
<LI><strong><A NAME="00813" HREF="msg00813.html">Re: [MUD-Dev] Parlez vous NPC?</A></strong>,
Matt Chatterley <a href="mailto:matt#mpc,dyn.ml.org">matt#mpc,dyn.ml.org</a>, Sun 22 Mar 1998, 12:46 GMT
</LI>
</UL>
</LI>
<LI><strong><A NAME="00808" HREF="msg00808.html">Re: [MUD-Dev] Dynamic Loading of Modules</A></strong>,
Chris Gray <a href="mailto:cg#ami-cg,GraySage.Edmonton.AB.CA">cg#ami-cg,GraySage.Edmonton.AB.CA</a>, Sat 21 Mar 1998, 17:58 GMT
<UL>
<LI><strong><A NAME="00825" HREF="msg00825.html">Re: [MUD-Dev] Dynamic Loading of Modules</A></strong>,
Jon A. Lambert <a href="mailto:jlsysinc#ix,netcom.com">jlsysinc#ix,netcom.com</a>, Sun 22 Mar 1998, 19:31 GMT
</LI>
</UL>
</LI>
<LI><strong><A NAME="00804" HREF="msg00804.html">Parlez vous NPC?</A></strong>,
Matt Chatterley <a href="mailto:matt#mpc,dyn.ml.org">matt#mpc,dyn.ml.org</a>, Sat 21 Mar 1998, 02:49 GMT
<UL>
<LI><strong><A NAME="00805" HREF="msg00805.html">Re: [MUD-Dev] Parlez vous NPC?</A></strong>,
Vadim Tkachenko <a href="mailto:vt#freehold,crocodile.org">vt#freehold,crocodile.org</a>, Sat 21 Mar 1998, 04:26 GMT
<UL>
<LI><strong><A NAME="00807" HREF="msg00807.html">Re: [MUD-Dev] Parlez vous NPC?</A></strong>,
Matt Chatterley <a href="mailto:matt#mpc,dyn.ml.org">matt#mpc,dyn.ml.org</a>, Sat 21 Mar 1998, 13:12 GMT
</LI>
</UL>
</LI>
<LI><strong><A NAME="00869" HREF="msg00869.html">Re: [MUD-Dev] Parlez vous NPC?</A></strong>,
Nathan F Yospe <a href="mailto:yospe#hawaii,edu">yospe#hawaii,edu</a>, Tue 24 Mar 1998, 03:39 GMT
</LI>
</UL>
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</UL></BLOCKQUOTE>
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