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Multiple Drag'n'Drop and HGLOBAL

Multiple Drag'n'Drop and HGLOBAL

Multiple Drag'n'Drop and HGLOBAL


I have make a window capable of multiple drap'n'drop (with other windows with same capability) thanks to threads. But I would like to unallow a window to drop to itself.

I use COleDropTarget and COleDataSource (Visual C++ 6 SP3, Windows NT 4 SP6).

I though I can do this by searching the HGLOBAL pointer recevied during drop in a class member array of HGLOBAL pointers of each drag started and not completed. But when I make a little try, storing the pointer HGLOBAL of the last drag in a member variable and then comparing to the HGLOBAL recieve, the values where different !! Why this ?

In OnBegindrag method :

HGLOBAL hgFiles;
COleDataSource* pSource = new COleDataSource();
(... Initialisation of hgFiles ...)
pSource->CacheGlobalData(CF_HDROP, hgFiles);

Then I retreive the HGLOBAL this way :
(in OnDragEnter(COleDataObject* pDataObject, ...)

ASSERT(pDataObject->GetData(CF_HDROP, &Medium));
ASSERT(Medium.tymed == TYMED_HGLOBAL);

Now, the HGLOBAL pointer is Medium.hGlobal.

But the two HGLOBAL doesn't match.

Any Idea ?

David Burg.

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