PrjGetOnDiskFileState not available? about projfs-managed-api HOT 4 CLOSED

On Wed, Jul 22, 2020 at 11:47 AM Christian Allred ***@***.***> wrote: @FeralSquid <https://github.com/FeralSquid> note that TryGetOnDiskFileState() will never return a state indicating "virtual"; if you look in Microsoft.Windows.ProjFS.OnDiskFileState <https://github.com/microsoft/ProjFS-Managed-API/blob/master/ProjectedFSLib.Managed.API/OnDiskFileState.h> you'll see that there is no "virtual" state. That's because a virtual file has no on-disk state. Calling TryGetOnDiskFileState() on a path for a virtual item will cause a request to the provider to hydrate a placeholder (which is why there's a warning that a running provider needs to be cautious calling it; the idea is that it is mainly intended for utility apps). If you just want to tell the difference between virtual and local (in any state), you can enumerate the item's parent directory. If the FILE_ATTRIBUTE_RECALL_ON_OPEN <https://docs.microsoft.com/en-us/windows/win32/fileio/file-attribute-constants> bit is set for that item in the enumeration then it is virtual. Again, you may need to be careful if the provider is performing the enumeration since it will receive callbacks to supply the contents of the enumeration it is itself requesting. Note that a provider that supports view changes <https://docs.microsoft.com/en-us/windows/win32/projfs/handling-view-changes> would be expected to keep track of which items it has hydrated, otherwise it would be difficult and/or expensive for the provider to determine which local items needed to be updated or deleted in the view change. — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#49 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AQJ2NHE7MBFNTNEISRNLHTTR44X5NANCNFSM4PEF2NWQ> .