MoveFile implementation with remote resources

[Sylvain Friquet]

Hello,

I'm using Dokan to build a remote file system and I'm having issues
with my MoveFile implementation.

I obviously can't use the windows MoveFile() and MoveFileEx()
functions as seen in the mirror example, since my files are on a
remote server.

The problem I'm having occurs when I try to rename a folder to a name
that already exists.
When I do so, MoveFile gets called, I return -183
(ERROR_ALREADY_EXISTS), and windows then asks me if I want to merge
the folders.
If I click no, nothing happens as expected, but if I click yes,
windows delete the folder I was renaming and MoveFile isn't called
again ...
Hence the folder I was trying to rename is lost and nothing is merged.

I'm wondering what my implementation of MoveFile should be in that
case?

Thank you in advance,

[Smurf IV]

         UInt32 dwFlags = (uint)(replaceIfExisting ? 1 : 0);
         // If the file is to be moved to a different volume, the function simulates the move by using the 

         // CopyFile and DeleteFile functions.
         dwFlags += 2; // MOVEFILE_COPY_ALLOWED 
 
         // The function does not return until the file is actually moved on the disk.

         // Setting this value guarantees that a move performed as a copy and delete operation 
         // is flushed to disk before the function returns. The flush occurs at the end of the copy operation.

         dwFlags += 8; // MOVEFILE_WRITE_THROUGH
 
         if (!MoveFileEx(pathSource, pathTarget, dwFlags))
            Marshal.ThrowExceptionForHR(Marshal.GetHRForLastWin32Error());

This is what I use in C# to move / rename a directory, but it would probably be the same in C++ / Win32
Read the following

// http://msdn.microsoft.com/en-us/library/aa365240%28VS.85%29.aspx

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[Sylvain Friquet]

Hello,

I don't think my problem is related to the ReplaceIfExisting flag.
In the example I gave it is always set to 0. Windows is asking for a
merge so I guess this makes sense.

I also can't use windows api function since my files aren't on the
file system, I have to implement the move on my own.

My problem is that after asking for user confirmation (after I checked
that the target already exists and returned the appropriate error
code, which is what the windows function MoveFile() would have done if
I had used it), the operating system does not call back the Dokan Move
file function, so I can't actually do the move. (and actually, even if
it did, I would probably end up looping since I would check again if
the target already exists...)

So I'm confused about how the move file operation should be
implemented in case of a merge.

On Nov 12, 9:46 am, Smurf IV <smurf...@gmail.com> wrote:
>          UInt32 dwFlags = (uint)(replaceIfExisting ? 1 : 0);
>          // If the file is to be moved to a different volume, the
> function simulates the move by using the
>          // CopyFile and DeleteFile functions.
>          dwFlags += 2; // MOVEFILE_COPY_ALLOWED
>
>          // The function does not return until the file is actually
> moved on the disk.
>          // Setting this value guarantees that a move performed as a
> copy and delete operation
>          // is flushed to disk before the function returns. The flush
> occurs at the end of the copy operation.
>          dwFlags += 8; // MOVEFILE_WRITE_THROUGH
>
>          if (!MoveFileEx(pathSource, pathTarget, dwFlags))
>             Marshal.ThrowExceptionForHR(Marshal.GetHRForLastWin32Error());
>
> This is what I use in C# to move / rename a directory, but it would probably
> be the same in C++ / Win32
> Read the following
>

> //http://msdn.microsoft.com/en-us/library/aa365240%28VS.85%29.aspx

>
> On Thu, Nov 11, 2010 at 6:37 PM, Sylvain Friquet

> <sylvain.friq...@gmail.com>wrote:

>
> > Hello,
>
> > I'm using Dokan to build a remote file system and I'm having issues
> > with my MoveFile implementation.
>
> > I obviously can't use the windows MoveFile() and MoveFileEx()
> > functions as seen in the mirror example, since my files are on a
> > remote server.
>
> > The problem I'm having occurs when I try to rename a folder to a name
> > that already exists.
> > When I do so, MoveFile gets called, I return -183
> > (ERROR_ALREADY_EXISTS), and windows then asks me if I want to merge
> > the folders.
> > If I click no, nothing happens as expected, but if I click yes,
> > windows delete the folder I was renaming and MoveFile isn't called
> > again ...
> > Hence the folder I was trying to rename is lost and nothing is merged.
>
> > I'm wondering what my implementation of MoveFile should be in that
> > case?
>
> > Thank you in advance,
>
> > --
> > You received this message because you are subscribed to the Google Groups
> > "Dokan" group.
> > To post to this group, send email to do...@googlegroups.com.
> > To unsubscribe from this group, send email to

> > dokan+un...@googlegroups.com <dokan%2Bunsu...@googlegroups.com>.

[Smurf IV]

From memory, I think you have to send the ERROR_ALREADY_EXISTS when the file is attempted to be created,
Then windows re-asks to overwrite
i.e. I am sure you get 2 calls to the overwrite, or via the CreateFile
Have a look at the code in my Liquesceops.cs for the sequence of events..

http://liquesce.codeplex.com

HTH