In UMDF driver the registered OnCreateFile/OnCloseFile never called

Hi All,

In My UMDF driver , i have given the implementation for OnCreateFile , OnCloseFile and OnCleanupFile…

But what i see is that when application creates a file handle on the device for which i have written the driver, the OnCreateFile file function is never getting called.

Similarly for others at the time of handle close in application , the OnCloseFile / OnCleanupFile is not getting called at all…

What might be the reason for this…?

thanks ,
Jagadish