在Internet上，电子邮件（E-MAIL）应用的非常广泛。通过它，用户可以很容易的
发送和接受信息。
通常，E-MAIL系统使用SMTP（发送邮件）和POP3（接收邮件）。有关此类协议更详
细的内容请参考RCF 821 (SMTP协议) and RFC 1225 ( POP3协议)。WINDOWS提供了
MAPI处理E-MAIL，但是它对直接与E-MAIL服务器通讯没有提供足够的功能。
这里是我自己编写的一个POP3协议的类，在这个类里我用CSocket 作为类的成员变
量，因此，我能在线程中使用。而且，POP3类的很多方法类似于POP3协议的命令。
下面是详细的代码：
/*--------------------------------------------------------------------
Pop.h : main header file for the POP application
-----------------------------------------------------------------------*/
#if !defined(AFX_POP_H__A44B38B6_697C_11D1_881E_00001C302581__INCLUDED_)
#define AFX_POP_H__A44B38B6_697C_11D1_881E_00001C302581__INCLUDED_
#define CONNECTION_CHECK 0
#define USER_CHECK 1
#define PASSWORD_CHECK 2
#define QUIT_CHECK 3
#define DELETE_CHECK 4
#define RSET_CHECK 5
#define STAT_CHECK 6
#define NOOP_CHECK 7
#define LIST_CHECK 8
#define RETR_CHECK 9
/////////////////////////////////////////////////////////////////////////////
class CPop
{
public:
BOOL List();
CWordArray m_SizeOfMsg;
CString GetErrorMessage(); // If there is any error this will return it method
CString GetPassword(); // Getting Password stored in class
void SetPassword(CString& Password); // Setting Password in class
CString GetUser(); // Getting user name stored in class
void SetUser(CString& User); // Setting user name in class
CString GetHost(); // Getting Host name (email server name) stored in class
void SetHost(CString& Host); // Setting Host name (email server name) in class
BOOL Connect(); // Connecting to email server
int GetTotalMailSize(); // it returns the Total Mail Size
int GetNumberOfMails(); // It return the number of mails
CString GetMsgContents();
BOOL Statistics(); // issue the STAT command on email server
BOOL Retrieve(int MsgNumber); // Getting any particular mail message
BOOL Reset(); // issue the reset command on email server
int GetMessageSize(int MsgNumber); // Return a size of any particular mail
BOOL Noop(); // issue the NOOP command on email server
BOOL Disconnect(); // issue the QUIT command on email server
BOOL Delete(int& MsgNumber); // Deleteing a particular message from email server
BOOL Connect(CString& Host, CString& User, CString& Password);
CPop();
virtual ~CPop();
private:
CString m_ErrorMessage;
BOOL CheckResponse(int ResponseType);
CString m_Password;
CString m_User;
CString m_Host;
CString m_MsgContents;
int m_TotalSize;
int m_NumberMail;
CSocket m_PopServer;
};
/#endif // !defined(AFX_POP_H__A44B38B6_697C_11D1_881E_00001C302581__INCLUDED_)
/*-----------------------------------------------------------------------------------------------
// Pop.cpp : Defines the class behaviors for the application.
---------------------------------------------------------------------------------------------------*/
#include "stdafx.h"
#include "Pop.h"
#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif
////////////////////////////////////////////////////////////////////
// CPop Class
//////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////
// Construction/Destruction
//////////////////////////////////////////////////////////////////////
CPop::CPop()
{
m_PopServer.Create();
}
//{4EEC1C91-6BE1-11d1-8824-00001C302581}
CPop::~CPop()
{
m_PopServer.Close();
}
BOOL CPop::Connect(CString & Host, CString & User, CString & Password)
{
char buf [512];
if (!m_PopServer.Connect(Host,110)) // 110 Pop3 Port
{
m_ErrorMessage = _T("Server cannot be connected");
return FALSE;
}
else
{
if(CheckResponse(CONNECTION_CHECK)==FALSE)
return FALSE;
wsprintf (buf, "USER %s/r/n", (LPCSTR) User);
m_PopServer.Send(buf, strlen (buf));
if(CheckResponse(USER_CHECK)==FALSE)
return FALSE;
wsprintf (buf, "PASS %s/r/n", (LPCSTR) Password);
m_PopServer.Send(buf, strlen (buf));
if (CheckResponse(PASSWORD_CHECK)==FALSE)
return FALSE;
return TRUE;
}
}
BOOL CPop::Delete(int & MsgNumber)
{
char buf [512];
wsprintf (buf, "DELE %d/r/n",MsgNumber );
m_PopServer.Send(buf, strlen (buf));
if (CheckResponse(DELETE_CHECK)==FALSE)
return FALSE;
else
return TRUE;
}
BOOL CPop::Disconnect()
{
char buf [512];
wsprintf (buf, "QUIT /r/n");
m_PopServer.Send(buf, strlen (buf));
if (CheckResponse(QUIT_CHECK)==FALSE)
return FALSE;
else
return TRUE;
}
BOOL CPop::Noop()
{
char buf [512];
wsprintf (buf, "NOOP /r/n");
m_PopServer.Send(buf, strlen (buf));
if (CheckResponse(NOOP_CHECK)==FALSE)
return FALSE;
else
return TRUE;
}
// Return the Msg Size for given msg number
int CPop::GetMessageSize(int MsgNumber)
{
if(m_SizeOfMsg.GetSize() < MsgNumber+1)
return 0;
else
return m_SizeOfMsg[MsgNumber+1];
}
BOOL CPop::Reset()
{
char buf [512];
wsprintf (buf, "RSET /r/n");
m_PopServer.Send(buf, strlen (buf));
if (CheckResponse(RSET_CHECK)==FALSE)
return FALSE;
else
return TRUE;
}
// MsgContents will hold the msg body
BOOL CPop::Retrieve(int MsgNumber)
{
char buf [512];
wsprintf (buf, "RETR %d/r/n",MsgNumber );
m_PopServer.Send(buf, strlen (buf));
if (CheckResponse(RETR_CHECK)==FALSE)
return FALSE;
else
return TRUE;
}
BOOL CPop::Statistics()
{
char buf [512];
wsprintf (buf, "STAT /r/n");
m_PopServer.Send(buf, strlen (buf));
if (CheckResponse(STAT_CHECK)==FALSE)
return FALSE;
else
return TRUE;
}
CString CPop::GetMsgContents()
{
return m_MsgContents;
}
int CPop::GetNumberOfMails()
{
return m_NumberMail;
}
int CPop::GetTotalMailSize()
{
return m_TotalSize;
}
BOOL CPop::Connect()
{
Connect(m_Host, m_User, m_Password);
return TRUE;
}
void CPop::SetHost(CString & Host)
{
m_Host = Host;
}
CString CPop::GetHost()
{
return m_Host;
}
void CPop::SetUser(CString & User)
{
m_User = User;
}
CString CPop::GetUser()
{
return m_User;
}
void CPop::SetPassword(CString & Password)
{
m_Password = Password;
}
CString CPop::GetPassword()
{
return m_Password;
}
BOOL CPop::CheckResponse(int ResponseType)
{
char buf [1000];
for (int i=0;i<512;i++)
buf[i]='/0';
m_PopServer.Receive(buf, sizeof(buf));
switch (ResponseType)
{
case CONNECTION_CHECK:
if (strnicmp(buf,"-ERR", 4) == 0)
{
m_ErrorMessage = _T("Bad Connection");
return FALSE;
}
break;
case USER_CHECK:
if (strnicmp(buf,"-ERR", 4) == 0)
{
m_ErrorMessage = _T("Bad User Name");
return FALSE;
}
break;
case PASSWORD_CHECK:
if (strnicmp(buf,"-ERR", 4) == 0)
{
m_ErrorMessage = _T("Bad Password Name");
return FALSE;
}
break;
case QUIT_CHECK:
if (strnicmp(buf,"-ERR", 4) == 0)
{
m_ErrorMessage = _T("Error occured during QUIT");
return FALSE;
}
break;
case DELETE_CHECK:
if (strnicmp(buf,"-ERR", 4) == 0)
{
m_ErrorMessage = _T("Error occured during DELE");
return FALSE;
}
break;
case RSET_CHECK:
if (strnicmp(buf,"-ERR", 4) == 0)
{
m_ErrorMessage = _T("Error occured during RSET");
return FALSE;
}
break;
case STAT_CHECK:
if (strnicmp(buf,"-ERR", 4) == 0)
{
m_ErrorMessage = _T("Error occured during STAT");
return FALSE;
}
else
{
BOOL EmailNumber = TRUE;
for (char *p = buf; *p != '/0'; p++)
{
if (*p == '/t' || *p == ' ')
{
if(EmailNumber == TRUE)
{
m_NumberMail = atoi(p);
EmailNumber = FALSE;
}
else
{
m_TotalSize = atoi(p);
return TRUE;
}
}
}
}
break;
case NOOP_CHECK:
if (strnicmp(buf,"-ERR", 4) == 0)
{
m_ErrorMessage = _T("Error occured during NOOP");
return FALSE;
}
break;
case LIST_CHECK:
if (strnicmp(buf,"-ERR", 4) == 0)
{
m_ErrorMessage = _T("Error occured during LIST");
return FALSE;
}
else
{
m_PopServer.Receive(buf, sizeof(buf));
for (char *p = buf; *p != '.'; p++)
if (*p == '/t' || *p == ' ')
m_SizeOfMsg.Add(atoi(p));
}
break;
case RETR_CHECK:
if (strnicmp(buf,"-ERR", 4) == 0)
{
m_ErrorMessage = _T("Error occured during RETR");
return FALSE;
}
else
{
char temp[9000];
m_PopServer.Receive(temp, sizeof(temp));
m_MsgContents = temp;
}
break;
}
return TRUE;
}
CString CPop::GetErrorMessage()
{
return m_ErrorMessage;
}
BOOL CPop::List()
{
char buf [512];
wsprintf (buf, "LIST /r/n");
m_PopServer.Send(buf, strlen (buf));
if (CheckResponse(LIST_CHECK)==FALSE)
return FALSE;
else
return TRUE;
}
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