DOC: CWnd::DragAcceptFiles() in Books Online

• The Microsoft Foundation Classes (MFC) included with: - Microsoft Visual C++ for Windows, versions 1.5, 1.51, 1.52 - Microsoft Visual C++, 32-bit Edition, versions 2.0, 2.1, 2.2, 4.0,

       4.1, 5.0
  

SUMMARY

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.

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.