Re: Suggestions on how to get Target Folder after DoDragDrop has finished...   

I'm no dragdrop expert, but you definitely need to remember the open file 
dialog.  I drag into and out of that all the time, and it can be in any 
process.

(Also, I have to say what you're describing sounds really scary, probably 
breaks the rules of COM for QueryInterface, and could lead to system 
instability.  If you share more details about what you're trying to 
accomplish perhaps folks can help you find a better way.)

HTH,
-- 
James Finnigan [MSFT] ( http://blogs.msdn.com/jamesfi )
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"Siegi"  wrote in message 
news:46b3f74d$0$13341$91cee783@newsreader02.highway.telekom.at...
> Hi!
>
> what i'm actually trying to accomplish:
>
> I'm writing a plugin that needs to hook into drag&drop operations (files). 
> i'm using import/export table modificaton hooks. On RegisterDragDrop i 
> provide my own IDropTarget class (it usually just passes everything 
> through to original class). Everythings fine regarding drag&drop (usually 
> explorer) to calling application.
>
> The other way round seems to be much harder. I've got a hook into 
> DoDragDrop and i'd really like to avoid again mimicking both IDataObject 
> and IDropSource (what would be a dragged file from calling application can 
> also result in a folder containing several files), but just wait for 
> DoDragDrop to finish and process/change file afterwards.
>
> Querying IDataObject for CF_FILEGROUPDESCRIPTOR gets me all filenames. 
> What i'm missing is the information where the file has been saved to.
>
> I'm not allowed to provide a shell extension, although that seems to be 
> the only proper approach anyway^^
>
> I've been thinking about using a global hook, checking there for 
> explorer.exe (i've not seen drag&drop working in any other process so far, 
> application is only providing CF_FILECONTENTS & CF_FILEGROUPDESCRIPTOR) 
> and wait for left or right mouse button to be released and store hwnd. 
> Maybe only read this information within one of the calls to IDataObject 
> since it's within DoDragDrop and might be more accurate?
>
> I've seen some approaches that might get filepath from hwnd (e.g. 
> http://blogs.msdn.com/oldnewthing/archive/2004/07/20/188696.aspx).
>
> Does anyone has a suggestion on how to get this information?
>
> It's no big deal if this approach would fail from time to time...
>
> Thanks,
> Siegi
>

date: Sun, 2 Sep 2007 00:57:08 -0700   author:   James Finnigan [MSFT]