MFCCTreeCtrl保存xml与读取

在VS2010下可编译运行，MFCCtreeCtrl保存为.xml格式，提供boolLoadXmlFile(CTreeCtrl&m_tree,string&szFileName)函数保存MFCCtreeCtrl,并提供boolCreateXmlFile(CTreeCtrl&m_tree,string&szFileName)方法从xml加载CtreeCtrl