Email is the most popular media for communication on Internet. This application is consist of two protocols,
POP 3
POP 3 protocol is usually used for retriving mail from email server (which is a POP server). I allready submitted a class which wrapper the POP 3 protocol. For official description of the protocol you can consult with RFC 1225.
SMTP
SMTP (Simple Mail Transfer Protocol) is used for sending email to it destination. For details about SMTP protocol you can refere to RCF 821 . My new contribution is wrapper class for SMTP protocol. I did not completely implemented the SMTP protocol but you can used it in any application which is sending mail through SMTP protocol.
This class has several methods. I choice the names of the methods same as the SMTP commands, so that it can be easily understandable. In this class again I used CSocket as class member (surperise not inherent it), so that I can used it in Threads. Following is code of the class with comments.
//////////////////////////////////////////////////////////////////////
// SMTP.h: interface for the CSMTP class.
//
//////////////////////////////////////////////////////////////////////
#if !defined(AFX_SMTP_H__617F7E82_7F4D_11D1_88A0_00001C302581__INCLUDED_)
#define AFX_SMTP_H__617F7E82_7F4D_11D1_88A0_00001C302581__INCLUDED_
#if _MSC_VER >= 1000
#pragma once
#endif // _MSC_VER >= 1000
#define CONNECTION_CHECK 0
#define HELLO_CHECK 1
#define MAIL_CHECK 2
#define RCPT_CHECK 3
#define DATA_START_CHECK 4
#define DATA_END_CHECK 5
#define QUIT_CHECK 6
#define DATA_CHECK 7
class CSMTP
{
public:
BOOL Mail(); //
CString GetErrorMessage();
BOOL Data(CString Subject, CString Body);
CString GetTo();
BOOL SetTo(CString to);
CString GetFrom();
void SetFrom(CString from);
BOOL Mail(CString from);
BOOL Disconnect();
CString GetHost();
void SetHost(CString Host);
BOOL Connect(CString Host, CString Me);
BOOL Connect();
CSMTP();
virtual ~CSMTP();
private:
CString GetError(CString Response);
CString m_ErrorMessage;
BOOL CheckResponse(int Type);
int m_NoOfTo;
CStringArray m_To;
CString m_From;
CSocket m_SMTPServer;
CString m_Host;
};
#endif // !defined(AFX_SMTP_H__617F7E82_7F4D_11D1_88A0_00001C302581__INCLUDED_)
//////////////////////////////////////////////////////////////////////////
// SMTP.cpp: implementation of the CSMTP class.
//
//////////////////////////////////////////////////////////////////////
#include "stdafx.h"
#include "MailSend.h"
#include "SMTP.h"
#ifdef _DEBUG
#undef THIS_FILE
static char THIS_FILE[]=__FILE__;
#define new DEBUG_NEW
#endif
//////////////////////////////////////////////////////////////////////
// Construction/Destruction
//////////////////////////////////////////////////////////////////////
CSMTP::CSMTP()
{
m_NoOfTo = 0;
m_SMTPServer.Create();
}
CSMTP::~CSMTP()
{
m_SMTPServer.Close();
}
// Connect to the SMTP Server
BOOL CSMTP::Connect()
{
return Connect(m_Host,m_From);
}
// Connect to the SMTP Server
BOOL CSMTP::Connect(CString Host,CString From)
{
if (!m_SMTPServer.Connect(Host,25)) // 25 for SMTP Port
{
m_ErrorMessage = _T("Server cannot be connected");
return FALSE;
}
else
{
if(CheckResponse(CONNECTION_CHECK)==FALSE)
return FALSE;
char buf [512];
wsprintf (buf, "HELO %s\r\n", (LPCSTR) From);
m_SMTPServer.Send(buf, strlen (buf));
if (CheckResponse(HELLO_CHECK)==FALSE)
return FALSE;
else
return TRUE;
return TRUE;
}
}
// Setting the Host String
void CSMTP::SetHost(CString Host)
{
m_Host = Host;
}
// Returing the Host String
CString CSMTP::GetHost()
{
return m_Host;
}
// Sending the "QUIT" command to the SMTP Server
BOOL CSMTP::Disconnect()
{
char buf[256];
wsprintf (buf, "QUIT \r\n");
m_SMTPServer.Send(buf, strlen (buf));
if (CheckResponse(QUIT_CHECK)==FALSE)
return FALSE;
else
return TRUE;
}
// Sending the "MAIL" command to the SMTP Server
BOOL CSMTP::Mail(CString from)
{
char buf[256];
wsprintf (buf, "MAIL From:<%s>\r\n", (LPCSTR) from);
m_SMTPServer.Send(buf, strlen (buf));
if (CheckResponse(MAIL_CHECK)==FALSE)
return FALSE;
else
return TRUE;
}
// Setting the From string
void CSMTP::SetFrom(CString from)
{
m_From = from;
}
// Returing the From string
CString CSMTP::GetFrom()
{
return m_From;
}
// Setting the TO string
BOOL CSMTP::SetTo(CString to)
{
char buf[256];
m_To.Add(to); // Saving vale of to
wsprintf (buf, "RCPT TO:<%s>\r\n", (LPCSTR) to);
m_SMTPServer.Send(buf, strlen (buf));
if (CheckResponse(RCPT_CHECK)==FALSE)
return FALSE;
else
return TRUE;
}
// Returing the TO string
CString CSMTP::GetTo()
{
if(m_To.GetSize()>=m_NoOfTo)
{
m_NoOfTo++;
return m_To[m_NoOfTo-1];
}
else
return _T("No more To available");
}
// Sending the "DATA" command to the SMTP Server
BOOL CSMTP::Data(CString Subject, CString Body)
{
char buf[256];
wsprintf (buf, "DATA\r\n");
m_SMTPServer.Send(buf, strlen (buf));
if (CheckResponse(DATA_CHECK)==FALSE)
return FALSE;
else
{
wsprintf (buf, "SUBJECT:%s\r\n", (LPCSTR) Subject);
m_SMTPServer.Send(buf, strlen (buf));
wsprintf (buf, "%s\r\n", (LPCSTR) Body);
m_SMTPServer.Send(buf, strlen (buf));
wsprintf (buf, ".\r\n");
m_SMTPServer.Send(buf, strlen (buf));
return TRUE;
}
}
// This methods checks the response from the
// Server
BOOL CSMTP::CheckResponse(int Type)
{
char buf [1000];
char temp[3];
for (int i=0;i < 512;i++)
buf[i]='\0';
// Receive the data from Server
m_SMTPServer.Receive(buf, sizeof(buf));
strncpy(temp,buf,3);
int temp2 = atoi(temp);
switch (Type)
{
case CONNECTION_CHECK:
if (temp2 != 220)
{
m_ErrorMessage = GetError((LPCTSTR)buf);
return FALSE;
}
break;
case HELLO_CHECK:
if (temp2 != 250)
{
m_ErrorMessage = GetError((LPCTSTR)buf);
return FALSE;
}
break;
case MAIL_CHECK:
if (temp2 != 250)
{
m_ErrorMessage = GetError((LPCTSTR)buf);
return FALSE;
}
break;
case RCPT_CHECK:
if (temp2 != 250)
{
m_ErrorMessage = GetError((LPCTSTR)buf);
return FALSE;
}
break;
case DATA_START_CHECK:
if (temp2 != 354)
{
m_ErrorMessage = GetError((LPCTSTR)buf);
return FALSE;
}
break;
case DATA_END_CHECK:
if (temp2 != 250)
{
m_ErrorMessage = GetError((LPCTSTR)buf);
return FALSE;
}
break;
case QUIT_CHECK:
if (temp2 != 221)
{
m_ErrorMessage = GetError((LPCTSTR)buf);
return FALSE;
}
break;
case DATA_CHECK:
if (temp2 != 354)
{
m_ErrorMessage = GetError((LPCTSTR)buf);
return FALSE;
}
break;
}
return TRUE;
}
// Returing the Error Message
CString CSMTP::GetErrorMessage()
{
return m_ErrorMessage;
}
// Preparing the Error Message according to
// Error Number
CString CSMTP::GetError(CString Response)
{
if(Response.Find("211"))
return _T("System status or system help reply");
if(Response.Find("214"))
return _T("Help Message");
if(Response.Find("220"))
return _T("Service is ready");
if(Response.Find("221"))
return _T("Service closing transmission channel");
if(Response.Find("250"))
return _T("Requested mail action okay, completed");
if(Response.Find("251"))
return _T("user not local: will forward to forward path");
if(Response.Find("354"))
return _T("Start mail input; end with
return _T("No Error Number is matched with ")+Response;
}
// Just overloading of the Mail method
BOOL CSMTP::Mail()
{
return Mail(m_From);
}
Here the samll implementation of the class,
CSMTP m_smtp;
m_smtp.Connect("khi.compol.com","aasif@khi.compol.com");
m_smtp.Mail("aasif@khi.compol.com");
m_smtp.SetTo("zafir@home.com");
m_smtp.Data("test message","This is a test message ... ");
m_smtp.Disconnect();