CreateFile() for RegisterDeviceNotification() with UAC

Question

Is it possible to use RegisterDeviceNotification() for a system drive, with UAC enabled? It works perfectly without UAC, but with UAC CreateFile() fails with Access Denied.

Here is how CreateFile is called:

aHandle:=CreateFile(PChar(sDevice), GENERIC_READ, FILE_SHARE_READ, nil, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, 0);

Is there a way to adjust CreateFile() parameters to just get minimum read permissions for the drive, or is it not possible without Administrator privileges at all?

Thanks in advance.

Answer 1

Did you try using something other than GENERIC_READ? Even 0 might work. FILE_SHARE_READ is also a bit restrictive, you might have to run it in a loop and try all share modes...

Answer 2

For file-system changes, FindFirstChangeNotification(MSDN) is your friend here. Just set up notifications for the directories you're interested in, and away you go. Search StackOverflow for this, and you'll get a number of hits on this topic.

To monitor disk space, GetDiskFreeSpaceEx(MSDN) is your friend. Just call it when you want the current state of the volume.