VC++ 開發pop3收郵件程序的相關問題

首先用VC做個pop3收郵件程序；不能連接；pop3的端口是110或995；

用telnet看一下能否收到郵箱郵件；這些都是不從瀏覽器進入郵箱收郵件的方式；telnet方式見此；

https://blog.csdn.net/bcbobo21cn/article/details/51321841

telnet也不能連接到郵箱；

一個VC通用的pop3類如下；

// pop3.cpp: implementation of the pop3 class.
//
//////////////////////////////////////////////////////////////////////

#include "stdafx.h"
#include "pop.h"
#include "pop3.h"
#include "fstream.h"


#ifdef _DEBUG
#undef THIS_FILE
static char THIS_FILE[]=__FILE__;
#define new DEBUG_NEW
#endif

//////////////////////////////////////////////////////////////////////
// Construction/Destruction
//////////////////////////////////////////////////////////////////////


pop3::pop3()
{
	m_PopServer.Create();
}

pop3::~pop3()
{
	m_PopServer.Close();
}

BOOL pop3::Connect(CString & Host, CString & User, CString & Password)
{
	char	buf [512];

	if (!m_PopServer.Connect(Host,110)) // 110 Pop3 Port
    //if (!m_PopServer.Connect(Host,995)) // qq
	{
		m_ErrorMessage = _T("Server cannot be connected");
		AfxMessageBox("Server cannot be connected!");
		return FALSE;
	}
	else
	{
		if(CheckResponse(CONNECTION_CHECK)==FALSE)
		{
			AfxMessageBox("CAN NOT CONNECT TO SERVER!");
			return FALSE;
		}
		wsprintf (buf, "USER %s\r\n", (LPCSTR) User);
		m_PopServer.Send(buf, strlen (buf));
		if(CheckResponse(USER_CHECK)==FALSE)
		{
			AfxMessageBox("WRONG USER!");
			return FALSE;
		}

		wsprintf (buf, "PASS %s\r\n", (LPCSTR) Password);
		m_PopServer.Send(buf, strlen (buf)); 
		if (CheckResponse(PASSWORD_CHECK)==FALSE)
		{
			AfxMessageBox("WRONG PASSWORD!");
			return FALSE;
		}

		return TRUE;
	}

}

BOOL pop3::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 pop3::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 pop3::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;
}

int pop3::GetMessageSize(int MsgNumber)
{
	if(m_SizeOfMsg.GetSize() < MsgNumber+1)
		return 0;
	else
		return m_SizeOfMsg[MsgNumber+1];
	
}

BOOL pop3::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 pop3::Retrieve(int  MsgNumber)
{
	char	buf [512];
	ZeroMemory(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 pop3::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 pop3::GetMsgContents()
{
	return m_MsgContents;
}

int pop3::GetNumberOfMails()
{
	return m_NumberMail;
}

int pop3::GetTotalMailSize()
{
	return m_TotalSize;
}

BOOL pop3::Connect()
{
	Connect(m_Host, m_User, m_Password);
	return TRUE;
}

void pop3::SetHost(CString & Host)
{
	m_Host = Host;
}

CString pop3::GetHost()
{
	return m_Host;
}

void pop3::SetUser(CString & User)
{
	m_User = User;
}

CString pop3::GetUser()
{
	return m_User;
}

void pop3::SetPassword(CString & Password)
{
	m_Password = Password;
}

CString pop3::GetPassword()
{
	return m_Password;
}

BOOL pop3::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");
				AfxMessageBox("NOOP ERR!");
				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];
				
                char	buf1 [512];
            	wsprintf (buf1, "NOOP \r\n");
				m_MsgContents = "";

				do
				{
					for(int k = 0; k <1000; k++)
					    for(int l = 0; l <10000; l++)
						{}//sleep(1111);
					int i = m_PopServer.Receive(temp, sizeof(temp));
					m_MsgContents += temp;
					int t = m_MsgContents.Find("\n.\r\n\0");
					if(t>0)
						m_MsgContents = m_MsgContents.Left(t);
					t = m_MsgContents.Find("+OK ");
					if(t>0)
					{
						m_MsgContents = m_MsgContents.Left(t);
						break;
					}
					m_PopServer.Send(buf1, strlen (buf1));
					if(i <= 30  && strnicmp(temp,"+OK ",4) == 0)
						break;
				}while(1);
			}
			break;
	}
	return TRUE;
}

CString pop3::GetErrorMessage()
{
	return m_ErrorMessage;
}

BOOL pop3::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;

}

 

頭文件；

// pop3.h: interface for the pop3 class.
//
//////////////////////////////////////////////////////////////////////

#if !defined(AFX_POP3_H__A7D9D85A_D946_48CE_AA1F_3C1A2D894BE7__INCLUDED_)
#define AFX_POP3_H__A7D9D85A_D946_48CE_AA1F_3C1A2D894BE7__INCLUDED_

#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000
#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 pop3  
{
public:
	pop3();
	virtual ~pop3();

	BOOL List();
	CWordArray m_SizeOfMsg;
	CString GetErrorMessage();
	CString GetPassword();
	void SetPassword(CString& Password);
	CString GetUser();
	void SetUser(CString& User);
	CString GetHost();
	void SetHost(CString& Host);
	BOOL Connect();
	int GetTotalMailSize();
	int GetNumberOfMails();
	CString GetMsgContents();
	BOOL Statistics();
	BOOL Retrieve(int MsgNumber);
	BOOL Reset();
	int  GetMessageSize(int MsgNumber);
	BOOL Noop();
	BOOL Disconnect();
	BOOL Delete(int& MsgNumber);
	BOOL Connect(CString& Host, CString& User, CString& Password);

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_POP3_H__A7D9D85A_D946_48CE_AA1F_3C1A2D894BE7__INCLUDED_)

連不上；想起來還沒用過foxmail；foxmail也是從桌面直接收郵件的；

foxmail也連不上；上網查了一下；原來自己郵箱的pop3和smtp功能默認是關閉的；

在郵箱設置裏面開啓；需要手機驗證；爲安全，如果不從桌面收郵件，不要開啓；

然後foxmail可以收郵件了 ；其設置如下；

再試程序；還是不能連接；

再用telnet，還是連不上；

修改代碼裏面連接端口；試一下端口爲110的郵箱；運行結果如下；

連不了；telnet此郵箱看一下；

客戶端禁止；郵箱的pop3和smtp功能默認關閉；又要手機驗證；先不搞了；