Hi,
Please note that this can be used only for temporary indexes.
When index is reopened then it needs valid key and for expressions.
It means that we create corrupted indexes in such way.
I'm sure I do not reopen tags with empty key expression. We can add key
expression check for expression loaded from index file. I've not tested,
but I guess this check already exists. See dbfcdx1.c line 3581:
pTag->RootBlock = 0; /* To force RT error - index corrupted */
I'll unblock such possibilities in next commit but maybe we should
allow to create such indexes only if temporary flag is set.
Temporary indexes are automatically removed on close so we will not
leave corrupted files. They are also open in EXCLUSIVE mode so other
application will not be able to access them.
Currently we do not use temporary flag, but we use our own functions to
generate temporary file name and we delete all temporary files on
application exit.
The implementation of temp file name is very similar to Harbour's
(GetTempPathA(), GetTempFileNameA(), with a different prefix "~db",
instead of "hb"). I do not remember the reason way we use our functions.
Perhaps this is legacy from Clipper times. I'll try to add TEMPORARY
flag and will look what will happen :)
Regards,
Mindaugas
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