4[]= "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
m_len = s.Length(); //取得字符串长度
m_s = s.c_str();
m_64code=""; //返回串置空
//处理3的倍数以内的字符
for(i=0;i
m_tmp=m_s[i]/4;
m_64code+=m_64[m_tmp];
m_tmp=m_s[i]%4*16 + m_s[i+1]/16;
m_64code+=m_64[m_tmp];
m_tmp=m_s[i+1]%16*4 + m_s[i+2]/64;
m_64code+=m_64[m_tmp];
m_tmp=m_s[i+2]%64;
m_64code+=m_64[m_tmp];
}
//如果字符串的长度被3除余2 ,不足的位数补0,尾部补“=”
if(m_len%3==2){
m_tmp=m_s[m_len-2]/4;
m_64code+=m_64[m_tmp];
m_tmp=m_s[m_len-2]%4*16+m_s[m_len-1]/16;
m_64code+=m_64[m_tmp];
m_tmp=m_s[m_len-1]%16*4;
m_64code+=m_64[m_tmp];
m_64code+==;
}
//如果字符串的长度被3除余1 ,不足的位数补0,尾部补两个“=”
if(m_len%3==1){
m_tmp=m_s[m_len-1]/4;
m_64code+=m_64[m_tmp];
m_tmp=m_s[m_len-1]%4*16;
m_64code+=m_64[m_tmp];
m_64code+="==";
}
return m_64code;
}
结束语
本程序在Windows 2000环境下使用Borland C++ Builder 6.0编写及调试的,分别使用网易和新浪邮箱做实验,都可以顺利完成身份认证以及邮件发送功能。