Calling opendir, readdir for empty removeable drive pops up SEM dialog

[Danny Smith]

 Calling opendir or readdir on empty floppy or CD drive causes the SEM
dialog box (No disk in drive..Abort/Retry/Ignore) to pop up.  Trying to
get the Ignore button to work eventually cause seg fault.

A workaround is to bracket calls to these functions with
SetErrorMode((SEM_FAILCRITICALERRORS | SEM_NOOPENFILEERRORBOX)); /*
disable SEM */
and

SetErrorMode(0) /*  enable */

This effectively presses Ignore for you without the SEM dialog: 
GetLastError returns 21 (ERROR_NOT_READY) which is what the Ignore
reponse should do.


Danny

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