Mainly it was for "historical" reasons when I tried to find a workaround for ReadDirectoryChangesExW which worked less reliably on network drives.
But you are right, one could do the same stuff in userfunc and keep "WatchFolder.ahk" unchanged.

Finally, I decided to add some lines of code to the original WatchFolder script to obtain the file size there. I only post the relevant part of the script. Modified lines are marked. ... Loop { FNIAddr += Offset OffSet := NumGet(FNIAddr + 0, "UInt") Action := NumGet(FNIAddr + 4, "UInt") Length := Nu...

After further testing I realized, that the script works fine on local NTFS folders, but it does not work on network NTFS folders. The code ObjIndex := DllCall("WaitForMultipleObjects", "UInt", ObjCount, "Ptr", WaitObjects, "Int", 0, "UInt", 0, "UInt") seems to always return the value 0 in case of ne...

just me Thank you. I did't consider that. Of course, I have to apply a factor of 1048576 to convert byte to megabyte. Therefore the corresponding line in the script should read: SizeMB := NumGet(FNIAddr + 48, "UInt64")/1048576 Now the returned file size is close to the value displayed by my file ex...

Finally I managed to fix the bugs. Here comes the code for the modified WatchFolder() function, which now returns also file sizes. Just to not mix it with the original one I named it WatchFolderEx(). #Requires AutoHotKey v2.0 ; ========================================================================...

Here is my question: I want WatchFolder() https://www.autohotkey.com/boards/viewtopic.php?t=95659 to return the file size as well. For this purpose I consulted follwing pages: https://learn.microsoft.com/en-us/windows/win32/api/winnt/ns-winnt-file_notify_extended_information and https://learn.micros...

I tried to adopt WatchFolder() to return filze size to UserFunc() as well. However, I didn't manage. I expected that I could make use of FILE_NOTIFY_EXTENDED_INFORMATION structure. https://learn.microsoft.com/en-us/windows/win32/api/winnt/ns-winnt-file_notify_extended_information But it didn't work ...