public static int DoDragDropHook(NativeMethods.IDataObject pDataObj, NativeMethods.IDropSource pDropSource, uint dwOKEffects, uint[] pdwEffect)
{
try
{
log.Info("Drag started");
if (!DataObjectHelper.GetDataPresent(pDataObj, "FileGroupDescriptorW"))
{
log.Info("No virtual files found -- continuing original drag");
return(NativeMethods.DoDragDrop(pDataObj, pDropSource, dwOKEffects, pdwEffect));
}
//Start new drag
log.Info("Virtual files found -- starting new drag adding CF_HDROP format");
log.InfoFormat("Files: {0}", string.Join(",", DataObjectHelper.GetFilenames(pDataObj)));
NativeMethods.IDataObject newDataObj = new OutlookDataObject(pDataObj);
int result = NativeMethods.DoDragDrop(newDataObj, pDropSource, dwOKEffects, pdwEffect);
//Get result
log.InfoFormat("DoDragDrop result: {0}", result);
return(result);
}
catch (Exception ex)
{
log.Warn("Dragging error", ex);
return(NativeMethods.DRAGDROP_S_CANCEL);
}
}
public static extern int DoDragDrop(NativeMethods.IDataObject pDataObj, NativeMethods.IDropSource pDropSource, uint dwOKEffects, uint[] pdwEffect);