判断字符串中点的个数

int nCountOfPoint(const string& paraStrUrl)
{
	int nSum = 0 ;
	string::size_type nPos = 0 ;
	while ((nPos = paraStrUrl.find_first_of(".", nPos)) != string::npos)
	{
		++nPos ;
		++nSum ;
	}

	return nSum ;
}