求助：qt新建Excel到保存时就卡死

请教大神是什么原因，代码如下
QString fileName = QFileDialog::getSaveFileName(NULL,"Save File",".","Excel File (*.xls)"); fileName.replace("/","\\");
QAxWidget _excel("Excel.Application");
_excel.setProperty("Visible",false);
QAxObject * _workbooks = _excel.querySubObject("WorkBooks");
_workbooks->dynamicCall("Add"); //添加一个新的工作薄
QAxObject * _workbook = _excel.querySubObject("ActiveWorkBook");
_workbook->dynamicCall("SaveAs (const QString&)",fileName); //保存
_workbook->dynamicCall("Close (Boolean)", false);
_excel.dynamicCall("Quit (void)");

也碰到了这个问题，先将后台的wps和office软件全部清空