C++发邮件用的是阻塞式socket模型,发送完数据后需要接收返回值,才能接着发送。
本程序不发送邮件附件,发附件的实例:C++实现含附件的邮件发送功能
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#include <iostream>
#include <string>
#include <WinSock2.h> //适用平台 Windows
using namespace std;
#pragma comment(lib, "ws2_32.lib") /*链接ws2_32.lib动态链接库*/
int main()
{
char buff[500]; //recv函数返回的结果
string message;
WSADATA wsaData;
WORD wVersionRequested = MAKEWORD(2, 1);
//WSAStarup,即WSA(Windows SocKNDs Asynchronous,Windows套接字异步)的启动命令
int err = WSAStartup(wVersionRequested, &wsaData);
cout << "WSAStartup:" << err << endl;
SOCKET sockClient; //客户端的套接字
sockClient = socket(AF_INET, SOCK_STREAM, 0); //建立socket对象
HOSTENT* pHostent;
pHostent = gethostbyname( "smtp.126.com" ); //得到有关于域名的信息
SOCKADDR_IN addrServer; //服务端地址
addrServer.sin_addr.S_un.S_addr = *(( DWORD *)pHostent->h_addr_list[0]); //得到smtp服务器的网络字节序的ip地址
addrServer.sin_family = AF_INET;
addrServer.sin_port = htons(25); //连接端口25
//int connect (SOCKET s , const struct sockaddr FAR *name , int namelen ); //函数原型
err = connect(sockClient, (SOCKADDR*)&addrServer, sizeof (SOCKADDR)); //向服务器发送请求
cout << "connect:" << err << endl;
buff[recv(sockClient, buff, 500, 0)] = '\0' ;
cout << "connect:" << buff << endl;
/*
登录邮件服务器
*/
message = "ehlo 126.com\r\n" ;
send(sockClient, message.c_str(), message.length(), 0); //发送ehlo命令
buff[recv(sockClient, buff, 500, 0)] = '\0' ; //接收返回值
cout << "helo:" << buff << endl; //输出返回值
message = "auth login \r\n" ;
send(sockClient, message.c_str(), message.length(), 0);
buff[recv(sockClient, buff, 500, 0)] = '\0' ;
cout << "auth login:" << buff << endl;
/*
发送base64加密的用户名、密码
*/
message = "xxxx\r\n" ; //base64 编码的用户名
send(sockClient, message.c_str(), message.length(), 0);
buff[recv(sockClient, buff, 500, 0)] = '\0' ;
cout << "usrname:" << buff << endl;
message = "xxxx\r\n" ; //base64 编码的密码
send(sockClient, message.c_str(), message.length(), 0);
buff[recv(sockClient, buff, 500, 0)] = '\0' ;
cout << "password:" << buff << endl;
/*
使用 MAIL 命令指定发送者
使用 RCPT 命令指定接收者,可以重复使用RCPT指定多个接收者
*/
message = "MAIL FROM:<xxxx@126.com> \r\nRCPT TO:<xxxx@126.com> \r\n" ;
send(sockClient, message.c_str(), message.length(), 0);
buff[recv(sockClient, buff, 500, 0)] = '\0' ;
cout << "mail from: " << buff << endl;
buff[recv(sockClient, buff, 500, 0)] = '\0' ;
cout << "rcpt to: " << buff << endl;
/*
使用 DATA 命令告诉服务器要发送邮件内容
*/
message = "DATA\r\n" ;
send(sockClient, message.c_str(), message.length(), 0);
buff[recv(sockClient, buff, 500, 0)] = '\0' ;
cout << "data: " << buff << endl;
message = "From: Bob@example.com\r\n\
To: Alice@example.com\r\n\
Cc: theboss@example.com\r\n\
subject: subject\r\n\r\n\
Hello Alice\r\n\
This is a test message with 4 header fields and 4 lines in the message body\r\n\
your friend \r\n\
Bob\r\n.\r\n"; //注意subject关键字与正文之间要有一个空行
send(sockClient, message.c_str(), message.length(), 0);
message = "QUIT\r\n" ;
send(sockClient, message.c_str(), message.length(), 0);
buff[recv(sockClient, buff, 500, 0)] = '\0' ;
cout << "QUIT:" << buff << endl;
system ( "pause" );
}
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邮件效果图
Telnet做个对比
邮箱的用户名和密码用BASE64加密
可以用这个网站在线加密,工具地址
dos中登陆smtp服务器的命令
126邮箱:telnet smtp.126.com 25
qq邮箱:telnet smtp.qq.com 25
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持服务器之家。
原文链接:https://blog.csdn.net/sinat_36219858/article/details/71074776