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Extended filename file operations programming in DOS mode

Posted on 2006-10-24
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Last Modified: 2010-04-16
I want to be able to copy FAT16/FAT32 files created in Win9x after booting to DOS with a DOS boot disk or Console Mode using a Win9x boot disk. This is primarily for upgrading hard drives in Win9x PCs. I think it is possible but not sure what tools to use to create such a program. My efforts so far have resulted in problems like (i) only 8.3 filenames supported, & (ii) program developed in Win9x IDE will not run in DOS mode. Any comments appreciated.
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Question by:tkonan
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cookre earned 1000 total points
ID: 17800576
For pure DOS, you'll need 16-bit real-mode code.  There may be others, but the only compiler/linker I know of that's readily available for that is Digital Mars:

http://www.digitalmars.com/

Pay special attention to the 16-bit guidelines:
http://www.digitalmars.com/ctg/win32programming.html#win16
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Author Comment

by:tkonan
ID: 18010106
Yeah thanks for that cookre. Will get to it when i can.
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Author Comment

by:tkonan
ID: 18012369
So are we talking about using the C/C++ or D compiler?

The license agreement says that the C/C++ compiler is 'not designed to operate after December 31, 1999', 'has not undergone testing' and also that 'It may be incomplete and it may not function properly'.

I guess that means i'd better include a verify command in my application.

:/
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LVL 22

Expert Comment

by:cookre
ID: 18012745
My guess is they didn't want to deal with Y2K.
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Author Comment

by:tkonan
ID: 18053238
ok. do you know if it is possible to use msvc++ to create this app?
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Author Comment

by:tkonan
ID: 18053263
version 6 that is
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LVL 22

Expert Comment

by:cookre
ID: 18056080
Alas, the last 16-bit compiler from MS was VC 1.52

Try this one - it claims to generate 16-bit code:
http://www.openwatcom.org/index.php/Main_Page
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Author Comment

by:tkonan
ID: 18058860
i am guessing 'real-mode' means a program that fits into the 640K memory block and therefore would need to specify a compatible memory model. However, when i do this with digital mars C/C++ compiler, the linker tells me a library is missing. Does this mean I would only be able to do it with the full version? could i not just specify the memory model in the ms linker?
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LVL 22

Expert Comment

by:cookre
ID: 18064377
You would normally specify the memory model to the compiler, either with a command line option or a #define.

Unfortunately, it would appear that the documentation is only on the CD version.
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LVL 22

Expert Comment

by:cookre
ID: 18064455
I found this old thread:
http://www.experts-exchange.com/Programming/Q_20666684.html?query=%22digital+mars%22&clearTAFilter=true

compiler option -ml for large memory model, -ms for small.




If you can't get DM working, try DJGPP:
http://www.delorie.com/djgpp/


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Author Comment

by:tkonan
ID: 18084324
i think the memory model also may only be on the cd version
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