C++ realizes the function of sending emails and attachments

This article shares the specific code of C++ to send emails and attachments for your reference. The specific content is as follows

The header file

/*************************
* Send mail module header file  
* Text and attachments can be sent (multiple attachments are supported) 1 Send)  
**************************/ 
#pragma once 
struct sMailInfo // Email messages  
{ 
 char* m_pcUserName;// The name of the user's login mailbox  
 char* m_pcUserPassWord;// The password of the user's login mailbox  
 char* m_pcSenderName;// The name displayed when the user sends it  
 char* m_pcSender;// Email address of the sender  
 char* m_pcReceiver;// The recipient's email address  
 char* m_pcTitle;// Your email title  
 char* m_pcBody;// Email text body  
 char* m_pcIPAddr;// The server's IP 
 char* m_pcIPName;// Server name ( IP And the name 2 choose 1 , preferred name)  
 sMailInfo(){memset(this,0,sizeof(sMailInfo));} 
}; 
class CSendMail 
{ 
public: 
 CSendMail(void); 
 ~CSendMail(void); 
 
public: 
 bool SendMail(sMailInfo &smailInfo);// To send a message, you need to initialize the message message at the time of sending  
 void AddFilePath(char * pcFilePath);// Add the attachment's decision path to the attachment list  
 void DeleteFilePath(char* pcFilePath);// Delete the attachment path, if any  
 void DeleteAllPath(void);// Delete the path of all attachments  
 
protected: 
 void GetFileName(char* fileName,char* filePath);// Gets the file name from the path of the attachment  
 void Char2Base64(char* pBuff64,char* pSrcBuff,int iLen);// the char Type into Base64 type  
 bool CReateSocket(SOCKET &sock);// To establish socket The connection  
 bool Logon(SOCKET &sock);// Login mailbox, mainly for the preparation of email  
 int GetFileData(char* FilePath);// Gets the attachment content from the file path  
 
 bool SendHead(SOCKET &sock);// Sending header  
 bool SendTextBody(SOCKET &sock);// Send the message text body  
 bool SendFileBody(SOCKET &sock);// Send email attachments  
 bool SendEnd(SOCKET &sock);// End of send message  
protected: 
 CList<char*,char*> m_pcFilePathList;// Record attachment path  
 
 char m_cSendBuff[4096];// Send buffer  
 char m_cReceiveBuff[1024]; 
 char* m_pcFileBuff;// Point to attachment content  
 sMailInfo m_sMailInfo; 
}; 

Module implementation file

/****************************
*  Send mail module  
* Text and attachments can be sent (multiple attachments are supported) 1 Send)  
*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 
 //  Assigned to pBuff64  write   Assigned to pBuff64+1 
 //   point Where we are  
 static char Base64Encode[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";//base64 The character table to map  
 int point;// every 1 Source character split position, desirable 2,4,6 ; For the initial 2 
 point=2; 
 int i; 
 int iIndex;//base64 Index of characters  
 char n=0;// on 1 The residual value of the source character  
 for(i=0;i<iLen;i++) 
 { 
  if(point==2) 
  { 
   iIndex=((*pSrcBuff)>>point)&0x3f;// achieve pSrcBuff The high point position  
  } 
  else if (point==4) 
  { 
   iIndex=((*pSrcBuff)>>point)&0xf;// achieve pSrcBuff The high point position  
  } 
  else if(point==6) 
  { 
   iIndex=((*pSrcBuff)>>point)&0x3;// achieve pSrcBuff The high point position  
  } 
  iIndex+=n;// with pSrcBuff-1 The low point Combination of Base64 The index of the  
  *pBuff64++=Base64Encode[iIndex];// From the index table pBuff64 
  n=((*pSrcBuff)<<(6-point));// Calculates residual values in source characters  
  n=n&0x3f;// Make sure that n The top two are 0 
  point+=2;// The split position of the source character goes up 2 
  if(point==8)// If the split position is 8 instructions pSrcBuff There are 6 Bit residue can be composed 1 A complete Base64 Character, so recombine directly 1 time  
  { 
   iIndex=(*pSrcBuff)&0x3f;// Extraction of low 6 Bits, that's the index  
   *pBuff64++=Base64Encode[iIndex];// 
   n=0;// Residual value is 0 
   point=2;// The split position is set to 2 
  } 
  pSrcBuff++; 
 
 } 
 if(n!=0) 
 { 
  *pBuff64++=Base64Encode[n]; 
 } 
 if(iLen%3==2)// If the source string length is not 3 I'm going to use multiples of theta '=' completion  
 { 
  *pBuff64='='; 
 } 
 else if(iLen%3==1) 
 { 
  *pBuff64++='='; 
  *pBuff64='='; 
 } 
} 
 
void CSendMail::AddFilePath(char * pcFilePath)// Add attachment path  
{ 
 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)// If it already exists, you don't have to add it  
  { 
   return; 
  } 
 } 
 m_pcFilePathList.AddTail(pcFilePath); 
} 
 
void CSendMail::DeleteFilePath(char* pcFilePath)// Delete attachment path  
{ 
 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)// Find it and delete it. If you don't find it, forget about it  
  { 
   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);// email 1 As is 25 port  
 if(m_sMailInfo.m_pcIPName=="") 
 { 
  servaddr.sin_addr.s_addr = inet_addr(m_sMailInfo.m_pcIPAddr);// Direct use of IP address  
 } 
 else 
 { 
  struct hostent *hp=gethostbyname(m_sMailInfo.m_pcIPName);// Use the name  
  servaddr.sin_addr.s_addr=*(int*)(*hp->h_addr_list); 
 } 
 
 
 int ret = connect(sock,(sockaddr*)&servaddr,sizeof(servaddr));// Establish a connection  
 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);// Start session  
 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);// Login request  
 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);// Send user name  
 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);// Send user password  
 recv(sock,m_cReceiveBuff,1024,0); 
 if(m_cReceiveBuff[0]!='2' || m_cReceiveBuff[1]!='3' || m_cReceiveBuff[2]!='5') 
 { 
  return false; 
 } 
 return true;// Login successful  
} 
 
 
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))// Establish a connection  
 { 
  return false; 
 } 
 
 if(!Logon(sock))// The login email  
 { 
  return false; 
 } 
 
 if(!SendHead(sock))// Sending header  
 { 
  return false; 
 } 
 
 if(!SendTextBody(sock))// Send the text portion of the message  
 { 
  return false; 
 } 
 
 if(!SendFileBody(sock))// Send attachments  
 { 
  return false; 
 } 
 
 if(!SendEnd(sock))// End the message and close it sock 
 { 
  return false; 
 } 
 
 return true; 
}