本文实例为大家分享了C++实现发送邮件和附件的具体代码，供大家参考，具体内容如下

头文件

/**************************发送邮件模块头文件 *可以发送文本和附件（支持多个附件一起发送） **************************/ #pragma once struct sMailInfo //邮件信息 { char* m_pcUserName;//用户登录邮箱的名称 char* m_pcUserPassWord;//用户登录邮箱的密码 char* m_pcSenderName;//用户发送时显示的名称 char* m_pcSender;//发送者的邮箱地址 char* m_pcReceiver;//接收者的邮箱地址 char* m_pcTitle;//邮箱标题 char* m_pcBody;//邮件文本正文 char* m_pcIPAddr;//服务器的IP char* m_pcIPName;//服务器的名称（IP与名称二选一，优先取名称） sMailInfo(){memset(this,0,sizeof(sMailInfo));} }; class CSendMail { public: CSendMail(void); ~CSendMail(void); public: bool SendMail(sMailInfo &smailInfo);//发送邮件，需要在发送的时候初始化邮件信息 void AddFilePath(char * pcFilePath);//添加附件的决定路径到附件列表中 void DeleteFilePath(char* pcFilePath);//删除附件路径，如果有的话 void DeleteAllPath(void);//删除全部附件的路径 protected: void GetFileName(char* fileName,char* filePath);//从附件的路径中获取文件名称 void Char2Base64(char* pBuff64,char* pSrcBuff,int iLen);//把char类型转换成Base64类型 bool CReateSocket(SOCKET &sock);//建立socket连接 bool Logon(SOCKET &sock);//登录邮箱，主要进行发邮件前的准备工作 int GetFileData(char* FilePath);//由文件路径获取附件内容 bool SendHead(SOCKET &sock);//发送邮件头 bool SendTextBody(SOCKET &sock);//发送邮件文本正文 bool SendFileBody(SOCKET &sock);//发送邮件附件 bool SendEnd(SOCKET &sock);//发送邮件结尾 protected: CList<char*,char*> m_pcFilePathList;//记录附件路径 char m_cSendBuff[4096];//发送缓冲区 char m_cReceiveBuff[1024]; char* m_pcFileBuff;//指向附件内容 sMailInfo m_sMailInfo; };

模块实现文件

/***************************** 发送邮件模块 *可以发送文本和附件（支持多个附件一起发送） *Date:2011-12-01 ******************************/ #include "StdAfx.h" #include "SendMail.h" #include "winsock2.h" #pragma comment(lib,"WSOCK32") CSendMail::CSendMail(void) { m_pcFileBuff=NULL; memset(m_cSendBuff,0,sizeof(m_cSendBuff)); memset(m_cReceiveBuff,0,sizeof(m_cReceiveBuff)); } CSendMail::~CSendMail(void) { DeleteAllPath(); } void CSendMail::Char2Base64(char* pBuff64,char* pSrcBuff,int iLen) { //1 1 1 1 1 1 1 1 // 分配给pBuff64 ↑ 分配给pBuff64+1 // point所在的位置 static char Base64Encode[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";//base64所映射的字符表 int point;//每一个源字符拆分的位置，可取2,4,6；初始为2 point=2; int i; int iIndex;//base64字符的索引 char n=0;//上一个源字符的残留值 for(i=0;i<iLen;i++) { if(point==2) { iIndex=((*pSrcBuff)>>point)&0x3f;//取得pSrcBuff的高point位 } else if (point==4) { iIndex=((*pSrcBuff)>>point)&0xf;//取得pSrcBuff的高point位 } else if(point==6) { iIndex=((*pSrcBuff)>>point)&0x3;//取得pSrcBuff的高point位 } iIndex+=n;//与pSrcBuff-1的低point结合组成Base64的索引 *pBuff64++=Base64Encode[iIndex];//由索引表得到pBuff64 n=((*pSrcBuff)<<(6-point));//计算源字符中的残留值 n=n&0x3f;//确保n的最高两位为0 point+=2;//源字符的拆分位置上升2 if(point==8)//如果拆分位置为8说明pSrcBuff有6位残留，可以组成一个完整的Base64字符，所以直接再组合一次 { iIndex=(*pSrcBuff)&0x3f;//提取低6位，这就是索引了 *pBuff64++=Base64Encode[iIndex];// n=0;//残留值为0 point=2;//拆分位置设为2 } pSrcBuff++; } if(n!=0) { *pBuff64++=Base64Encode[n]; } if(iLen%3==2)//如果源字符串长度不是3的倍数要用'='补全 { *pBuff64='='; } else if(iLen%3==1) { *pBuff64++='='; *pBuff64='='; } } void CSendMail::AddFilePath(char * pcFilePath)//添加附件路径 { if(pcFilePath==NULL) { return; } int i; char* temp; for(i=0;i<m_pcFilePathList.GetCount();i++) { temp=m_pcFilePathList.GetAt(m_pcFilePathList.FindIndex(i)); if(strcmp(pcFilePath,temp)==0)//如果已经存在就不用再添加了 { return; } } m_pcFilePathList.AddTail(pcFilePath); } void CSendMail::DeleteFilePath(char* pcFilePath)//删除附件路径 { int i; char* temp; for(i=0;i<m_pcFilePathList.GetCount();i++) { temp=m_pcFilePathList.GetAt(m_pcFilePathList.FindIndex(i)); if(strcmp(temp,pcFilePath)==0)//找到并删除它，如果没找到就算了 { m_pcFilePathList.RemoveAt(m_pcFilePathList.FindIndex(i)); delete[] temp; return; } } } void CSendMail::DeleteAllPath(void) { m_pcFilePathList.RemoveAll(); } int CSendMail::GetFileData(char* FilePath) { m_pcFileBuff=NULL; if(FilePath==NULL) { return 0; } CFile f; int len; USES_CONVERSION; if(!f.Open(A2W(FilePath),CFile::modeRead|CFile::modeNoTruncate|CFile::typeBinary)) { return 0; } len=(int)f.GetLength(); m_pcFileBuff=new char[len+1]; memset(m_pcFileBuff,0,len+1); f.Read(m_pcFileBuff,len); f.Close(); return len; } void CSendMail::GetFileName(char* fileName,char* filePath) { if(filePath==NULL || fileName==NULL) { return; } int i; for(i=0;i<(int)strlen(filePath);i++) { if(filePath[strlen(filePath)-1-i]=='\\') { memcpy(fileName,&filePath[strlen(filePath)-i],i); return; } } } bool CSendMail::CReateSocket(SOCKET &sock) { WORD wVersionRequested; WSADATA wsaData; int err; wVersionRequested = MAKEWORD( 2, 2 ); err = WSAStartup( wVersionRequested, &wsaData ); if ( err != 0 ) { return false; } if ( LOBYTE( wsaData.wVersion ) != 2 || HIBYTE( wsaData.wVersion ) != 2 ) { WSACleanup( ); return false; } sock = socket(AF_INET,SOCK_STREAM,IPPROTO_IP); if (sock == INVALID_SOCKET) { return false; } sockaddr_in servaddr; memset(&servaddr,0,sizeof(sockaddr_in)); servaddr.sin_family = AF_INET; servaddr.sin_port = htons(25);//发邮件一般都是25端口 if(m_sMailInfo.m_pcIPName=="") { servaddr.sin_addr.s_addr = inet_addr(m_sMailInfo.m_pcIPAddr);//直接使用IP地址 } else { struct hostent *hp=gethostbyname(m_sMailInfo.m_pcIPName);//使用名称 servaddr.sin_addr.s_addr=*(int*)(*hp->h_addr_list); } int ret = connect(sock,(sockaddr*)&servaddr,sizeof(servaddr));//建立连接 if (ret == SOCKET_ERROR) { return false; } return true; } bool CSendMail::Logon(SOCKET &sock) { recv(sock,m_cReceiveBuff,1024,0); memset(m_cSendBuff,0,sizeof(m_cSendBuff)); sprintf_s(m_cSendBuff,"HELO []\r\n"); send(sock,m_cSendBuff,strlen(m_cSendBuff),0);//开始会话 recv(sock,m_cReceiveBuff,1024,0); if(m_cReceiveBuff[0]!='2' || m_cReceiveBuff[1]!='5' || m_cReceiveBuff[2]!='0') { return false; } memset(m_cSendBuff,0,sizeof(m_cSendBuff)); sprintf_s(m_cSendBuff,"AUTH LOGIN\r\n"); send(sock,m_cSendBuff,strlen(m_cSendBuff),0);//请求登录 recv(sock,m_cReceiveBuff,1024,0); if(m_cReceiveBuff[0]!='3' || m_cReceiveBuff[1]!='3' || m_cReceiveBuff[2]!='4') { return false; } memset(m_cSendBuff,0,sizeof(m_cSendBuff)); Char2Base64(m_cSendBuff,m_sMailInfo.m_pcUserName,strlen(m_sMailInfo.m_pcUserName)); m_cSendBuff[strlen(m_cSendBuff)]='\r'; m_cSendBuff[strlen(m_cSendBuff)]='\n'; send(sock,m_cSendBuff,strlen(m_cSendBuff),0);//发送用户名 recv(sock,m_cReceiveBuff,1024,0); if(m_cReceiveBuff[0]!='3' || m_cReceiveBuff[1]!='3' || m_cReceiveBuff[2]!='4') { return false; } memset(m_cSendBuff,0,sizeof(m_cSendBuff)); Char2Base64(m_cSendBuff,m_sMailInfo.m_pcUserPassWord,strlen(m_sMailInfo.m_pcUserPassWord)); m_cSendBuff[strlen(m_cSendBuff)]='\r'; m_cSendBuff[strlen(m_cSendBuff)]='\n'; send(sock,m_cSendBuff,strlen(m_cSendBuff),0);//发送用户密码 recv(sock,m_cReceiveBuff,1024,0); if(m_cReceiveBuff[0]!='2' || m_cReceiveBuff[1]!='3' || m_cReceiveBuff[2]!='5') { return false; } return true;//登录成功 } bool CSendMail::SendHead(SOCKET &sock) { int rt; memset(m_cSendBuff,0,sizeof(m_cSendBuff)); sprintf_s(m_cSendBuff,"MAIL FROM:<%s>\r\n",m_sMailInfo.m_pcSender); rt=send(sock,m_cSendBuff,strlen(m_cSendBuff),0); if(rt!=strlen(m_cSendBuff)) { return false; } recv(sock,m_cReceiveBuff,1024,0); memset(m_cSendBuff,0,sizeof(m_cSendBuff)); sprintf_s(m_cSendBuff,"RCPT TO:<%s>\r\n",m_sMailInfo.m_pcReceiver); rt=send(sock,m_cSendBuff,strlen(m_cSendBuff),0); if(rt!=strlen(m_cSendBuff)) { return false; } recv(sock,m_cReceiveBuff,1024,0); memset(m_cSendBuff,0,sizeof(m_cSendBuff)); memcpy(m_cSendBuff,"DATA\r\n",strlen("DATA\r\n")); rt=send(sock,m_cSendBuff,strlen(m_cSendBuff),0); if(rt!=strlen(m_cSendBuff)) { return false; } recv(sock,m_cReceiveBuff,1024,0); memset(m_cSendBuff,0,sizeof(m_cSendBuff)); sprintf_s(m_cSendBuff,"From:\"%s\"<%s>\r\n",m_sMailInfo.m_pcSenderName,m_sMailInfo.m_pcSender); sprintf_s(&m_cSendBuff[strlen(m_cSendBuff)],150,"To:\"INVT.COM.CN\"<%s>\r\n",m_sMailInfo.m_pcReceiver); sprintf_s(&m_cSendBuff[strlen(m_cSendBuff)],150,"Subject:%s\r\nMime-Version: 1.0\r\nContent-Type: multipart/mixed; boundary=\"INVT\"\r\n\r\n",m_sMailInfo.m_pcTitle); rt=send(sock,m_cSendBuff,strlen(m_cSendBuff),0); if(rt!=strlen(m_cSendBuff)) { return false; } return true; } bool CSendMail::SendTextBody(SOCKET &sock) { int rt; memset(m_cSendBuff,0,sizeof(m_cSendBuff)); sprintf_s(m_cSendBuff,"--INVT\r\nContent-Type: text/plain;\r\n charset=\"gb2312\"\r\n\r\n%s\r\n\r\n",m_sMailInfo.m_pcBody); rt=send(sock,m_cSendBuff,strlen(m_cSendBuff),0); if(rt!=strlen(m_cSendBuff)) { return false; } else { return true; } } bool CSendMail::SendFileBody(SOCKET &sock) { int i; char* filePath; int rt; int len; int pt=0; char fileName[128]; for(i=0;i<m_pcFilePathList.GetCount();i++) { pt=0; memset(fileName,0,128); filePath=m_pcFilePathList.GetAt(m_pcFilePathList.FindIndex(i)); len=GetFileData(filePath); GetFileName(fileName,filePath); sprintf_s(m_cSendBuff,"--INVT\r\nContent-Type: application/octet-stream;\r\n name=\"%s\"\r\nContent-Transfer-Encoding: base64\r\nContent-Disposition: attachment;\r\n filename=\"%s\"\r\n\r\n",fileName,fileName); send(sock,m_cSendBuff,strlen(m_cSendBuff),0); while (pt<len) { memset(m_cSendBuff,0,sizeof(m_cSendBuff)); Char2Base64(m_cSendBuff,&m_pcFileBuff[pt],min(len-pt,3000)); m_cSendBuff[strlen(m_cSendBuff)]='\r'; m_cSendBuff[strlen(m_cSendBuff)]='\n'; rt=send(sock,m_cSendBuff,strlen(m_cSendBuff),0); pt+=min(len-pt,3000); if(rt!=strlen(m_cSendBuff)) { return false; } } if(len!=0) { delete [] m_pcFileBuff; } } return true; } bool CSendMail::SendEnd(SOCKET &sock) { sprintf_s(m_cSendBuff,"--INVT--\r\n.\r\n"); send(sock,m_cSendBuff,strlen(m_cSendBuff),0); sprintf_s(m_cSendBuff,"QUIT\r\n"); send(sock,m_cSendBuff,strlen(m_cSendBuff),0); closesocket(sock); WSACleanup(); return true; } bool CSendMail::SendMail(sMailInfo &smailInfo) { memcpy(&m_sMailInfo,&smailInfo,sizeof(smailInfo)); if(m_sMailInfo.m_pcBody==NULL || m_sMailInfo.m_pcIPAddr==NULL || m_sMailInfo.m_pcIPName==NULL || m_sMailInfo.m_pcReceiver==NULL || m_sMailInfo.m_pcSender==NULL || m_sMailInfo.m_pcSenderName==NULL || m_sMailInfo.m_pcTitle==NULL || m_sMailInfo.m_pcUserName==NULL || m_sMailInfo.m_pcUserPassWord==NULL) { return false; } SOCKET sock; if(!CReateSocket(sock))//建立连接 { return false; } if(!Logon(sock))//登录邮箱 { return false; } if(!SendHead(sock))//发送邮件头 { return false; } if(!SendTextBody(sock))//发送邮件文本部分 { return false; } if(!SendFileBody(sock))//发送附件 { return false; } if(!SendEnd(sock))//结束邮件，并关闭sock { return false; } return true; }

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