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HOWTO: Access file/folder paths from dataobject in C++ during drag-drop

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Joined: 18 Jul 2005
Posts: 731

Posted: Fri Jan 16, 2009 11:18 am Post subject: HOWTO: Access file/folder paths from dataobject in C++ during drag-drop

When a drag-drop operation occurs over FileView, The OnOnOleDragOver and OnOnOleDragDrop events occur. To get file/folder paths data from the data object, use the following code :

Code:

// FolderView OnOnOleDragDrop event handler
void CFdrViewVCDlg::OnOnOleDragDropFolderviewctrl1(LPDISPATCH Data, long effect, long Button, long Shift, float x, float y, LPDISPATCH Node, BOOL FAR* DoDefaultShellDropAction)
{
CFOVDataObject dataObject;
dataObject.AttachDispatch(Data,FALSE);

CStringArray files;

if (dataObject.GetFormat(CF_HDROP)) // Are file/folder paths present
{
   VARIANT varFiles = dataObject.GetFiles();

   // File/folder paths are stored in the variant as an array of BSTRs
   if(varFiles.vt == (VT_ARRAY|VT_BSTR))
   {
      long i=0;
      BSTR file;
      while(SUCCEEDED(SafeArrayGetElement(varFiles.parray,&i,&file)))
      {
         CString temp = file;
         files.Add(temp);
         i++;
      }
   }
   VariantClear(&varFiles);
}

// At this point, 'files' contains all the files being drag-dropped
}

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