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ivan  
#1 Posted : Monday, May 2, 2011 12:20:52 AM(UTC)
ivan

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[b]Delphi Example[/code]

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

Unit Unit1; 

Interface 

Uses 
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms, 
  Dialogs, StdCtrls, EAGetMailObjLib_TLB; 

Type 
  TForm1 = Class(TForm) 
    Button1: TButton; 
    Procedure Button1Click(Sender: TObject); 
  private 
    { Private declarations } 
  public 
    { Public declarations } 
  End; 

Const 
  MailServerPop3 = 0; 
  MailServerImap4 = 1; 

Var 
  Form1: TForm1; 

Implementation 

{$R *.dfm} 

Procedure TForm1.Button1Click(Sender: TObject); 
Var 
  oClient: TMailClient; 
  oServer: TMailServer; 
  oTools: TTools; 
  mailFolder: WideString; 
  leaveCopy: Boolean; 
Begin 
  Try 
    oTools := TTools.Create(Application); 

    // Create a folder named "inbox" under
    // current directory to store the email files
    mailFolder := GetCurrentDir() + '\inbox'; 
    oTools.CreateFolder(mailFolder); 

    oServer := TMailServer.Create(Application); 
    oServer.Server := 'pop3.emailarchitect.net'; 
    oServer.User := 'test@emailarchitect.net'; 
    oServer.Password := 'testpassword'; 
    oServer.Protocol := MailServerPop3; 

    // If your server requires SSL connection
    // Please add the following codes
    // oServer.SSLConnection := true;
    // oServer.Port := 995;

    // Leave a copy of message
    leaveCopy := true; 

    oClient := TMailClient.Create(Application); 
    oClient.LicenseCode := 'TryIt'; 

    // Send request to EAGetMail Service, then EAGetMail Service retrieves email
    // in background and this method returns immediately.
    oClient.GetMailsByQueue(oServer.DefaultInterface, mailFolder, leaveCopy ); 

  Except 
    On ep:Exception Do 
      ShowMessage( 'Error: ' + ep.Message ); 
  End; 
End; 

End. 

Click here to read original topic - full version ...

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