schanin@oracle.com (Steve Chanin) (03/10/91)
In <1991Mar7.155516.9877@mck-csc.mckinsey.com>, Jeffrey Weiss asks:
Can you tell if the drive is ready (i.e., media inserted and door closed)?
I know there is a DOS function call where you can detect "media ready" for
a handle, but I'd like to check before I open a file on the diskette. Can
you get a handle for the device itself?
why don't you use the harderr/hardretn functions in the MSC runtime
libraries to take over Interrupt 0x24 briefly. Once you've done this,
just try to open/read a file on the drive, if there is no disk ready,
your error routines will get called, you can return a 3 to fail the
operation and no one will be the wiser (i.e. no abort, retry, fail
message will appear).
EX (in pseudo-C)
--
old_handler = _getvect(0x24)
_harderr(your_handler);
while (open("a:...",...))
{ printf("Please insert disk XXX in drive A\nPresss RETURN when ready");
scanf(fred,"%S"); }
_setvect(old_hander)
Steve
P.S. - Say hi to Joe Tang for me and give him my email address.
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