Problem with ksycoca on windows
js at iidea.pl
Fri Feb 8 12:14:00 GMT 2008
Christian Ehrlicher said the following, On 2008-02-08 07:11:
> I've a problem on windows - when ksycoca is running / the db is open, I
> can't execute kbuildsycoca to update the db. The problem is that
> kbuildsycoca can't overwrite an open file on windows.
Interesting that I've even complained on this during the kdepim meeting :)
Look at src/corelib/io/qfsfileengine_win.cpp:
bool QFSFileEnginePrivate::nativeOpen(QIODevice::OpenMode openMode)
// All files are opened in share mode (both read and write).
DWORD shareMode = FILE_SHARE_READ | FILE_SHARE_WRITE;
So... we perhaps lack FILE_SHARE_DELETE flag here...
If we need that, we could patch Qt (and request accepting the patch by TT) to
add support for FILE_SHARE_DELETE semantics.
See also:  http://mg.to/2004/09/30/file_share_delete-in-shell-extension
> There're two solutions
> - let kbuildsycoca create ksyscoca.new and rename the file when db is closed
Good idea; Unless I have oversimplified that, as mentioned in , with
FILE_SHARE_DELETE flag the processes will still use the old file though unless
they release handles.
> - open the file in a special mode so I can delete it also someone has an
> open file handle on it.
> But for this I can't use QFile
Why? because we cannot set sharing flags FILE_SHARE_WRITE | FILE_SHARE_READ |
FILE_SHARE_DELETE as in CreateFile()?
If we cannot alter the sharing for handle returned by QFile::handle(), we
could develop a wrapper... but hope the changes in Qt will make it unnecessary.
regards / pozdrawiam, Jaroslaw Staniek
Sponsored by OpenOffice Polska (http://www.openoffice.com.pl/en) to work on
Kexi & KOffice (http://www.kexi.pl/en, http://www.koffice.org/kexi)
KDE Libraries for MS Windows (http://windows.kde.org)
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