Drag and drop and IAsyncOperation problems

Hello,

I'm developing db-based document management system. Currently I'm trying to
implement adding documents to the system through drag and drop from Windows
Explorer. This is quite lengthy operation involving some user input in
wizard that appears.
So I decided to use IAsyncOperation explosed by explorer's IDataObject.
The following problems occured (Win2K SP3):
1. IAsyncOperation->GetAsyncMode() returns TRUE but not VARIANT_TRUE as
noted in MSDN
2. When I'm even not using asynchronous drag and drop some file managers do
not remove files if I set pdwEffect to DROPEFFECT_MOVE and set
CFSTR_PERFORMEDDROPEFFECT format to the same value. Explorer deletes files
but, for example, Windows Commander doesn't
3. In asynchronous drag and drop mode I set CFSTR_PERFORMEDDROPEFFECT format
to DROPEFFECT_MOVE and call IAsyncOperation::EndOperation(S_OK, NULL,
DROPEFFECT_MOVE). Everything works fine but Windows Explorer doesn't delete
files :(
Adding files is made in the new spawned thread (from IDataObject::Drop
method) as well as CFSTR_PERFORMEDDROPEFFECT and EndOperation. IDataObject
interface pointer is marshalled through
CoMarshalInterThreadInterfaceInStream/CoGetInterfaceAndReleaseStream. No
AddRef/Release is performed (is this correct?).
IAsyncOperation::BeginOperation is called before spawning the thread

Any help is highly desired.

without being certain, a shot to nothing would be to set
CFSTR_LOGICALPERFORMEDDROPEFFECT too and see
if explorer respects it after the async operation

however, if _you_ are performing the operation, why don't
you follow the "optimized move operations" guidelines in MSDN
and delete the source files yourself?

----
www.netez.com/2xExplorer






to
Windows
do
format
delete

Thanx for your reply.
I tried to set CFSTR_LOGICALPERFORMEDDROPEFFECT but it didn't help :(
My program stores documents in the database so I think that optimized move
is not the case.
As it follows from MSDN the unoptimized move is the case. Drop source is
responsible for deleting items.

Did I choose the correct way of transferring data object to the spawned
thread
(CoMarshalInterThreadInterfaceInStream/CoGetInterfaceAndReleaseStream) ? I
also make AddRef to data object in the main thread and release it after
EndOperation() in the spawned thread.

IAsyncOperation->GetAsyncMode() returns TRUE but not VARIANT_TRUE as noted
in MSDN :(

Are there any threading issues related to asynchronous mode? In what thread
BeginOperation() should be performed?




files
IDataObject

that is true when copying files _out_ of your database
when you accept files on the other hand, there's no stopping you
deleting the original files/documents, no?


I am not that familiar with IAsyncOperation, sorry
in general, if by the end all your object references are released
you don't have any problems with lockings
(Have you tried calling EndOperation from the main thread,
sending some custom message when the threaded operation finishes?)



that's life! :)
the good thing is that in C++ both values pass the if() test

> > My program stores documents in the database so I think that optimized
move
Well, as I understood optimized move takes place when target application
__moves__ items (e.g. files in the file system) using its knowlenge of
physical storage (e.g. moving file from one folder to another without
unnecessary copies).
Sure, I can delete files. However it introduces some changes in code and a
lot of interesting work :)
IMHO source applications, such as explorer can do this better.

Thanx for idea, maybe I'll try this.
The interesting thing was discovered. If I set CFSTR_PASTESUCCEEDED (!!!)
everything works fine ... 8-0
Is this way wrong ?

Yea, unfortunately this is not the only place in MSDN considering drag&drop
where documentation confuses :)
"Using IASyncOperation" part of "Handling Shell Data Transfer Scenarios" is
too concise IMHO :(