Dear Mailinglist members,
I am currently working on a legacy project that needs some updating.
While reviving my Turbo Pascal and Assembler skills, I stumbled across
one strange thing. My Application needs to enumerate the available
drives (C:, D:, etc.) and determine their types. In addition, an NTFS
wrapper (ntfs4dos for example) might be loaded at this point.
I found some old code in the SWAG archive that claims to be able to to
this but I can't get it to work properly. Actually, it just finds my
CDROM and RAM disk. :(
So how can I find
a) assigned drive letters, and
b) the corresponding drive type for each drive letter, distinguishing
between local drives, network drives, cdroms and drives hosted by tools
like NTFS4DOS?
a) can be solved by using the "DREADY" method. This tool from Horst
Schaeffer just tries to open a file on the specified drive - probably
not the best solution but short, simple and effective.
b) however gives me quite some headaches. I tried to examine the Int21h
calls from the SWAG source code, but e.g. Int21h/AX=4409 always returns
an error (Carry flag set), no matter whether the drive exists or not.
Any suggestions on how to solve this are most welcome :)
Best regards,
Andre
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