C++ 建立邮件客户端之收邮件(利用POP3)(二)

//发送命令,以此类推...

void SocketRM::GetUIDL()
{
send(ServMail,"uidl\r\n",strlen("uidl\r\n"),0);
recv(ServMail,(LPSTR)recvbuf,sizeof(recvbuf),0);
//std::cout<<"Serve:"<<recvbuf;
memset(recvbuf,0,20000);
//std::cout<<"Serve:"<<std::endl;
};//得到邮件头信息

void SocketRM::GetEmailInfo()
{
//查看"某"个邮件的前1行
std::cout<<"Which Email do you want?";
std::string Choice;
std::cin>>Choice;
Order="top "+Choice+" 1\r\n";
send(ServMail,Order.c_str(),strlen(Order.c_str()),0);

recv(ServMail,(LPSTR)recvbuf,sizeof(recvbuf),0);
//std::cout<<"Serve:"<<recvbuf;
memset(recvbuf,0,20000);
//std::cout<<"Serve:"<<std::endl;
while(true)
{
//之所以要收取两次SOCKET的缓存区，是POP3中的retr命令
//该命令会先从服务器中下载一个邮件信息——大小
//然后会在下载邮件原文，所以要从服务器上下载两次，也就是要两次存入SOCKET缓存区
//那么就需要recv()函数进行2次COPY.
int val=recv(ServMail,(LPSTR)recvbuf,sizeof(recvbuf),0);
std::cout<<recvbuf;
bufStr+=recvbuf;
memset(recvbuf,0,20000);
//对于从服务器收到的邮件原文的数据：
//对于最后的结尾，有：
//recvbuf[val]=='\0',recvbuf[val-1]=='\n',recvbuf[val-2]=='\r',标志符
if(recvbuf[val]=='\0')
break;

}
bufStr=bufStr.c_str();

};

//End...