Registers the specified window as a window that can be the target of an OLE drag and
drop operation and specifies the IDropTarget
instance to use for drop operations.
| HWND hwnd,
||//Window that can accept drops
| IDropTarget * pDropTarget
||//Points to the IDropTarget interface
Specifies the handle to a window that can be a target for an OLE drag and drop
Specifies the IDropTarget
instance to use for communicating OLE drag and drop information for the
Indicates the application was registered successfully.
Indicates invalid handle returned in the hwnd
Indicates the specified window has already been registered as a drop target.
Indicates out of memory.
If your application can accept dropped objects during OLE drag and drop
operations, you must call the RegisterDragDrop
function. Do this whenever one of your application windows is available as a
potential drop target, i.e., when the window appears unobscured on the screen.
function only registers one window at a time, so you must call it for each
application window capable of accepting dropped objects.
As the mouse passes over unobscured portions of the target window during an
OLE drag and drop operation, the DoDragDrop
function calls the specified IDropTarget::DragOver
method for the current window. When a drop operation actually occurs in a
given window, the DoDragDrop
function calls IDropTarget::Drop
function also calls the IUnknown::AddRef
method for your drop target interface.
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