Microsoft KB Archive/182219

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PRB: Shell Returns DROPEFFECT_NONE Instead of DROPEFFECT_MOVE

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Q182219

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The information in this article applies to:


 * Microsoft Win32 Software Development Kit (SDK), on platform(s):
 * the operating system: Microsoft Windows NT
 * the operating system: Microsoft Windows 2000

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SYMPTOMS
When a file is moved onto a shell window in Windows NT 4.0 through OLE Drag- and-Drop and the CF_HDROP format, DoDragDrop returns DROPEFFECT_NONE instead of DROPEFFECT_MOVE, even though the file is successfully moved.

CAUSE
The Windows NT 4.0 shell optimizes the move operation by moving the file itself. A return value of DROPEFFECT_MOVE tells the calling program that it should delete the file itself. However, since the shell has already done this, it returns DROPEFFECT_NONE.

RESOLUTION
If the originating program needs to know if the file actually was moved, it can check to see if the source file still exists.

Windows 95 also performs this optimized move, but returns DROPEFFECT_MOVE.

STATUS
This behavior is by design.

Additional query words:

Keywords : _IK kbOSWinNT400 kbOSWin2000 kbSDKWin32 kbGrpDSShell

Issue type : kbprb

Technology : kbWin32SDKSearch kbAudDeveloper kbSDKSearch kbWin32sSearch