关于MFC中CString类SpanIncluding方法用来检查字符串是否符合要求的字符

CString str;
CString m_sTel;
...
str = m_sTel.SpanIncluding(_T("-+0123456789"));
if (str != m_sTel)
{
	//说明字符串m_sTel中有超出SpanIncluding给定范围内的字符
}