Microsoft KB Archive/150571

= FIX: CWnd::DragAcceptFiles in Books Online =

Article ID: 150571

Article Last Modified on 11/21/2006

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APPLIES TO

 Microsoft Foundation Class Library 4.2, when used with:  Microsoft Visual C++ 1.5 Professional Edition

 Microsoft Visual C++ 1.51

 Microsoft Visual C++ 1.52 Professional Edition

 Microsoft Visual C++ 5.0 Enterprise Edition</li></ul>

 Microsoft Visual C++ 2.0 Professional Edition</li></ul>

 Microsoft Visual C++ 2.1</li></ul>

 Microsoft Visual C++ 6.01 Professional Edition</li></ul>

 Microsoft Visual C++ 4.0 Professional Edition</li></ul>

 Microsoft Visual C++ 4.1 Subscription</li></ul>

 Microsoft Visual C++ 5.0 Professional Edition</li></ul>

 Microsoft Visual C++ 5.0 Learning Edition</li></ul> </li></ul>

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This article was previously published under Q150571

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SYMPTOMS
The documentation for CWnd::DragAcceptFiles in Books Online states:

Call this member function from within the main window in your application's CWinApp::InitInstance function to indicate that your main window and all child windows accept dropped files from the Windows File Manager.

This information is not correct. The message is not propagated to the child windows.

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STATUS
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MORE INFORMATION
Since DragAcceptFiles is a member function of CWnd class, a CWnd pointer is needed to call this function in CWinApp::InitInstance. The window that calls DragAcceptFiles with the bAccept parameter set to TRUE has identified itself as able to process the WM_DROPFILES message from Windows File Manager.

For example, in an MFC MDI application, if the CMDIFrameWnd window pointer is used in the DragAcceptFiles function call, only the CMDIFrameWnd window gets the WM_DROPFILES message. This message is not sent to all open CMDIChildWnd windows. For a CMDIChildWnd window to receive this message, you need to call DragAcceptFiles with the CMDIChildWnd window pointer.

The correct documentation is also found in Windows API DragAcceptFiles function in Books Online.

Additional query words: kbdocerr

Keywords: kbbug kbdocs kbfix kbnoupdate kbvc600fix KB150571

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