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From: | "Johan Venter" <jventer AT writeme DOT com> |
Newsgroups: | comp.os.msdos.djgpp |
References: | <1 DOT 5 DOT 4 DOT 16 DOT 19990801161857 DOT 1a2f7b02 AT erie DOT net> |
Subject: | Re: Questions |
Lines: | 47 |
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Message-ID: | <tofp3.17474$yD2.37662@newsfeeds.bigpond.com> |
Date: | Mon, 2 Aug 1999 11:13:24 +1000 |
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NNTP-Posting-Date: | Mon, 02 Aug 1999 21:35:53 EST |
Organization: | Telstra BigPond Internet Services (http://www.bigpond.com) |
To: | djgpp AT delorie DOT com |
DJ-Gateway: | from newsgroup comp.os.msdos.djgpp |
Reply-To: | djgpp AT delorie DOT com |
Rich wrote in message <1 DOT 5 DOT 4 DOT 16 DOT 19990801161857 DOT 1a2f7b02 AT erie DOT net>... > 1) does the DJGPP _always_ make a 32-bit exe, or _only_ when certain >compiler directives are in place? It always makes 32-bit protected mode executables. > 2) actual DPMI functions _only_ become available when specific >"dmpi-activating" instructions are used ? The DPMI services are always available (and required) when useing DJGPP-created programs. > 3) I wish to learn more about how DJGPP seems to interface well with >16-bit DOS drivers/TSR's, considering its 32-bit. Well, there are a number of ways: 1. The DOS extender helps with this. 2. Programs can be written to use special features of DJGPP for accessing 16-bit things (especially interrupts). > 4) How on earth can I reduce the size of a simple djgpp program?!?! > printf("Hello DJGPP!\n"); consumed 103K for the EXE !! and contained > tons of debug/stub info! Compile with the -s (that's a SMALL s) command line option, that will strip all your debug info (making it impossible to debug the program properly). Also, look for an EXE file compressor named UPX. > I notice some people are designing "Windows 95" applications which >claim to support Long-Filenames, "pixview" being one of them. > When I run this program in Win95 I still see ~ in the filenames... DJGPP is natively compatible with Windows 9x long file names. They don't work on Windows NT though. >I am MOST INTERESTED in books which provide information on the library >functions (djgpp version of the C/C++ runtime library). Why not read the source? That must be the best way to learn how they work. -- Johan Venter ICQ 3643877 Visit The TPU DJGPP Interest Group: http://surf.to/djgppig
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