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From: "Rod Pemberton" <do_not_have AT nohavenot DOT cmm>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: Drag and Drop to Command Line
Date: Tue, 15 Jul 2008 04:25:44 -0400
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"Rob Gaddi" <rgaddi AT technologyhighland DOT com> wrote in message
news:I6-dnUDsEJnAOebVnZ2dnUVZ_rPinZ2d AT lmi DOT net...
> I've written a very short assembler in C for a proprietary microengine
> that I'm working on.  Like any sensible assembler, it wants to take in
> the input filename on the command line, and if no further command line
> options are given, make some assumptions based on the input filename as
> to what the output filename should be.  I drive it from the command
> prompt and all is well.  I pass it long filenames, it works with long
> filenames, and creates outputs with long filenames.  Fine, perfect, all
> well and good.
>
> But when I try to drag and drop from Explorer (under XP) onto the .EXE
> of the interpreter, for some reason it gets passed the short file name
> instead, and I get the appropriately mangled output file names.
> Ideally, this wouldn't happen;

Although I like Sandmann's solution (Hey, how've you been?), the DJGPP
solution would be to call the DOS LFN API (see RBIL, Int 0x21, AX=71xxh).  I
recently had the opposite problem.  I needed SFN's for PKZIP (PKZIPFIX,
actually) on XP.  My app. (for DJGPP v2.03) calls Int 0x21, AX=71A0h to
determine if LFN's are available, then calls Int 0x21, AX=7160h to convert
the LFN to SFN.  You should be able to call 7160 to convert an SFN to LFN
too.  7160 returns the full path (cl=0), short filename (cl=1), or long
filename (cl=2).  My app. worked on XP SP1 and SP2.  I'm not sure about the
original version or the new SP3.

I previously posted my version of the call to 71A0.  My version of 7160
(unposted) does things similarly.
http://groups.google.com/group/comp.os.msdos.djgpp/msg/612bfd16d8331af0

Unfortunately, that version doesn't show the #includes, etc.  However, I
also posted a version for OpenWatcom (w/DJGPP code) to
openwatcom.users.c_cpp which is more complete:
http://groups.google.com/group/openwatcom.users.c_cpp/msg/a021f62b0571635e

> Windows seems happy to pass plenty of
> other programs long names from a drag and drop.  But it thinks that mine
> wants a short name instead.

Sorry, I don't use XP regularly, so I don't know what the problem is.


Rod Pemberton