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From:	"MikeC" <Mike DOT Best AT btconnect DOT com>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Accepting files (question)
Date:	Sun, 22 Jun 2008 12:29:29 +0100
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To:	djgpp AT delorie DOT com
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Reply-To:	djgpp AT delorie DOT com

Good Folk,

I have written a parser program that operates on one or more files to 
produce an output file.  It takes an input file, parses it (with the help of 
other files if they are given) and produces an output file.
The way I operate the program under Windows XP is to make a shortcut icon to 
my program on the task bar, then I select the input file(s) with Wndows 
Explorer, drag it (or them symoltaneously) onto the shortcut icon, and drop 
them.  The filenames are passed exactly as if I had typed them all on the 
command line...

myparser d:\path_1\file_1  d:\path_2\file_2

... and the filenames are placed in argv[n].   No problems there - it works 
fine.

I have used the same technique on several other programs too.  It's a nice 
way of operating a DOS program from Windows.

I want to write a simple file encryption program that uses a one-time pad. 
This technique is very secure, as long as nobody gets hold of the key - and 
therein lies the snag.  I want to use another file on the PC as a key, but I 
don't want to say "Input key ... Browse", as that makes it obvious that it 
is on the PC somewhere.  What I want to do is drop the document to be 
encrypted on the program's shortcut icon to fire it up, then have it wait 
till a second file (the key) is dropped on it, and have it detect and use 
that second file.  I have played around with it a bit, but dropping a second 
file on the icon just starts a second image of my program, and while 
dropping the file into the DOS screen gives the right Windows indications (a 
'+' copy icon), I can't detect the file name.  Can anybody shed some light 
on this please?

I have recently downloaded Notepad++, and I can't sing its praises highly 
enough.  It's a terrific piece of work - and the comparison plugin has saved 
me a lot of time already and made me look impressive in the eyes of my 
colleagues - but what I wanted to say is that it operates in the way I said. 
Drop a text file on it, and it starts up and displays the text.  Drop a 
second one on it while it is running, and it opens a new tab and displays 
the second file.  Admittedly, it is compiled by a compiler that is made for 
Windows, not one that is made for DOS, but I'm sure DJGPP has a way, if 
somebody can tell me.

Thanks very much,

MikeC

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