How to get dropped file names by using OLE drag and drop in Visual C++

MORE INFORMATION

To retrieve the dropped file names from a drop source, modify the sample code included with Microsoft Knowledge Base article 135299 as follows.

Sample code

   // OnDrop is called by OLE DLLs when an item is dropped in a window
   // that is registered with the OLE DLLs.
   // 
   BOOL COleEditDropTarget::OnDrop(CWnd* pWnd, COleDataObject* pDataObject,
      DROPEFFECT dropEffect, CPoint point )
   {
    HGLOBAL  hGlobal;
    LPCSTR   pData;

    FORMATETC fmtetc =
   { CF_HDROP, NULL, DVASPECT_CONTENT, -1, TYMED_HGLOBAL };
    STGMEDIUM stgmed;
    TCHAR szFileName[_MAX_PATH + 1];

    if(pDataObject->GetData(CF_HDROP, &stgmed, &fmtetc))
    {
        HDROP hdrop = (HDROP)GlobalLock(stgmed.hGlobal);

        if (NULL != hdrop)
        {
            UINT nFiles = DragQueryFile(hdrop, (UINT)-1, NULL, 0);

            for(UINT nNames = 0; nNames < nFiles; nNames++)
            {
                ZeroMemory(szFileName, _MAX_PATH + 1);
                DragQueryFile
                    (hdrop, nNames, (LPTSTR)szFileName, _MAX_PATH + 1);
                // Do something with szFileName.
            }
            GlobalUnlock(hdrop);

        }
        ReleaseStgMedium(&stgmed);
      return TRUE;

    } else {

   // Get text data from ColeDataObject.
   hGlobal=pDataObject->GetGlobalData(CF_TEXT);

   // Get a pointer to data.
   pData=(LPCSTR)GlobalLock(hGlobal);
   ASSERT(pData!=NULL);

   // Set text in the dropped window.
   ((CEdit*)pWnd)->SetWindowText(pData);

   // Unlock memory.
   GlobalUnlock(hGlobal);

   return TRUE;
   }
   }
				

(c) Microsoft Corporation 1998, All Rights Reserved. Contributions by Robert Duke, Microsoft Corporation.