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ivan  
#1 Posted : Monday, May 2, 2011 5:07:53 AM(UTC)
ivan

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Visual C++ Example

In an ASP/ASP.NET email application, if email download takes longer than the timeout value (in seconds) that the current asp page is allowed to run, user will get an error "ASP Timeout". This often happens when user has a large quantity of emails to download or user downloads emails via a slow connection. By default the timeout is set to 90 seconds, it is easy to exceed this limit.

Obviously, a solution to ASP timeout is to set ASPScriptTimeout a larger value. You may click here for details. Technically the timeout problem can be solved in this way; however, some users may get frustrated and press the stop button on the browser toolbar as he waits too long.

EAGetMail POP3 Component introduces a more intelligent method to retrieve emails in background. You should download the EAGetMail Service installer and install it on your machine at first. Then you can use MailClient.GetMailsByQueue method to send the request to EAGetMail Service, the method returns to the user immediately and the EAGetMail Service performs task in background.

To run the following example, you also need to download EAGetMail Service and install it on your machine.

The following example codes demonstrate how to download email from POP3 server in background.
Code:

// The following example codes demonstrate downloading email from POP3 server in background
// To get full sample projects, please download and install EAGetMail on your machine.
// To run it correctly, please change email server, user, password, folder, file name value to yours

#include "stdafx.h" 

#include "eagetmailobj.tlh" 
using namespace EAGetMailObjLib; 

int _tmain(int argc, _TCHAR* argv[]) 
{ 
    const int MailServerPop3 = 0; 
    const int MailServerImap4 = 1; 

    // Initialize COM environment
    ::CoInitialize( NULL ); 

    // Create a folder named "inbox" under current exe file directory
    // to save the emails retrieved.
    TCHAR szPath[MAX_PATH+1]; 
    memset( szPath, 0, sizeof(szPath)); 
    ::GetModuleFileName( NULL, szPath, MAX_PATH ); 

    // Change file name to current full path
    LPCTSTR psz = _tcsrchr( szPath, _T(' ')); 
    if( psz != NULL ) 
    { 
        szPath[psz-szPath] = _T(' 0'); 
    } 
    TCHAR szMailBox[MAX_PATH+1]; 
    memset( szMailBox, 0, sizeof(szMailBox)); 
    wsprintf( szMailBox, _T("%s\\inbox"), szPath ); 

    // Create a folder to store emails
    ::CreateDirectory( szMailBox, NULL ); 

    try 
    { 
        IMailServerPtr oServer = NULL; 
        oServer.CreateInstance("EAGetMailObj.MailServer"); 
        oServer->Server = _T("pop3.emailarchitect.net"); 
        oServer->User = _T("test@emailarchitect.net"); 
        oServer->Password = _T("testpassword"); 
        oServer->Protocol = MailServerPop3; 

        // If your POP3 requires SSL connection
        // Please add the following codes
        // oServer->SSLConnection = VARIANT_TRUE;
        // oServer->Port = 995;

        IMailClientPtr oClient = NULL; 
        oClient.CreateInstance("EAGetMailObj.MailClient"); 
        oClient->LicenseCode = _T("TryIt"); 

        // Leave a copy of message on server
        VARIANT_BOOL leaveCopy = VARIANT_TRUE; 

        // Send request to EAGetMail Service, then EAGetMail Service retrieves email
        // in background and this method returns immediately.
        oClient->GetMailsByQueue( oServer, szMailBox, leaveCopy ); 
    } 
    catch( _com_error &ep ) 
    { 
        _tprintf( _T("Error: %s"), (const TCHAR*)ep.Description()); 
    } 

    return 0; 
} 

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If you have any comments or questions about above example codes, please add your comments here.
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