Send Email with Event Handler in Managed C++/CLI

In previous section, I introduced how to encrypt email with digital certificate. In this section, I will introduce how to send email with event handler in Managed C++.


In previous examples, after SendMail method is invoked, if you want to know the progress of the email sending, you should use Event Handler. The following sample codes demonstrate how to use Event Handler to monitor the progress of email sending.


Remarks: All of samples in this section are based on first section: A simple Managed C++/CLI project. To compile and run the following example codes successfully, please click here to learn how to create the test project and add reference of EASendMail to your project.

[Managed C++/CLI Example - Send email with event handler]

The following example codes demonstrate how to send email with event handler.


To get the full sample projects, please refer to Samples section.

#include "stdafx.h"
using namespace System;
using namespace EASendMail;

//EASendMail EventHandler
System::Void OnIdle( System::Object ^sender, System::Boolean % cancel )
    // this event is fired when the SmtpClient is wait for response from
    // SMTP server, if you add Application.DoEvents in windows form application,
    // it can prevent your form has no response before SendMail is not returned.
    // Application::DoEvents();

System::Void OnConnected(System::Object ^sender, System::Boolean % cancel )

System::Void OnSendingDataStream(System::Object ^sender, int sent,
                                    int total, System::Boolean % cancel )
    Console::WriteLine( String::Format( "{0}/{1} sent", sent, total));

System::Void OnAuthorized( System::Object ^sender, System::Boolean % cancel )

System::Void OnSecuring( System::Object ^sender, System::Boolean % cancel )
    Console::WriteLine("Securing ...");

int main(array<System::String ^> ^args)
        SmtpMail ^oMail = gcnew SmtpMail("TryIt");
        // Set sender email address, please change it to yours
        oMail->From = "";
        // Set recipient email address, please change it to yours
        oMail->To = "";

        // Set email subject
        oMail->Subject = "test email from Managed C++ project";
        // Set email body
        oMail->TextBody = "this is a test email sent from Managed C++ project, do not reply";

        // Your SMTP server address
        SmtpServer ^oServer = gcnew SmtpServer("");

        // User and password for ESMTP authentication.
        oServer->User = "";
        oServer->Password = "testpassword";

        // Most mordern SMTP servers require SSL/TLS connection now.
        // ConnectTryTLS means if server supports SSL/TLS, SSL/TLS will be used automatically.
        oServer->ConnectType = SmtpConnectType::ConnectTryTLS;

        // If your SMTP server uses 587 port
        // oServer->Port = 587;

        // If your SMTP server requires SSL/TLS connection on 25/587/465 port
        // oServer->Port = 25; // 25 or 587 or 465
        // oServer->ConnectType = SmtpConnectType::ConnectSSLAuto;

        Console::WriteLine("start to send email with event handler ...");

        SmtpClient ^oSmtp = gcnew SmtpClient();
        // Catching the following events is not necessary,
        // just make the application more user friendly.
        // If you use the object in service or non-gui application,
        // You need not to catch the following events.
        oSmtp->OnIdle += gcnew SmtpClient::OnIdleEventHandler(&OnIdle);
        oSmtp->OnAuthorized += gcnew SmtpClient::OnAuthorizedEventHandler(&OnAuthorized);
        oSmtp->OnConnected += gcnew SmtpClient::OnConnectedEventHandler(&OnConnected);
        oSmtp->OnSecuring += gcnew SmtpClient::OnSecuringEventHandler(&OnSecuring);
        oSmtp->OnSendingDataStream +=
                    gcnew SmtpClient::OnSendingDataStreamEventHandler(&OnSendingDataStream);

        oSmtp->SendMail(oServer, oMail);
        Console::WriteLine("email was sent successfully!");
    catch (Exception ^ep)
        Console::WriteLine("failed to send email with the following error:");

    return 0;

Next Section

At next section I will introduce how to send email in asynchronous mode.



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