The following C++/CLI example codes demonstrate how to retrieve email from Gmail IMAP4 server.
Gmail POP3 and IMAP4 Setting
Gmail POP3 server address is pop.gmail.com
. It requires SSL connection on 995
port, and you should use your Gmail email address as the user name for user authentication.
Gmail IMAP4 server address is imap.gmail.com
. It requires SSL connection on 993
port, and you should use your Gmail email address as the user name for user authentication.
For example: your email is gmailid@gmail.com
, and then the user name should be
gmailid@gmail.com
.
To retrieve email from Gmail account, you need to enable POP3 or IMAP4 access in your gmail account settings.
Because Gmail POP3 server doesn’t work like normal POP3 server, it hides old emails automatically even the email was not deleted, so we suggest that you use IMAP4 protocol.
Server | Port | SSL | Protocol |
pop.gmail.com | 995 | SSL required | Pop3 |
imap.gmail.com | 993 | SSL required | Imap4 (recommended) |
Important
If you got authentication error, you need to enable Allowing less secure apps or Sign in using App Passwords.
Another way is Gmail OAUH, please see Gmail IMAP OAUTH section.
Sections:
Before you can use the following sample codes, you should download the EAGetMail Installer and install it on your machine at first. Full sample projects are included in this installer.
Install from NuGet
You can also install the run-time assembly by NuGet. Run the following command in the NuGet Package Manager Console:
Install-Package EAGetMail
Note
If you install it by NuGet, no sample projects are installed, only .NET assembly is installed.
To use EAGetMail POP3 & IMAP Component in your project, the first step is “Add reference
of EAGetMail to your project”. Please create or open your project with Visual Studio,
then go to menu
-> Project
-> Add Reference
-> .NET
-> Browse...
, and
select EAGetMail{version}.dll
from installation path, click Open
-> OK
, the reference
will be added to the project, you can start to use it to
retrieve email and parse email in your project.
Because EAGetMail has separate builds for .Net Framework, please refer to the following table and choose the correct dll.
Separate builds of run-time assembly for .Net Framework 1.1, 2.0, 3.5, 4.0, 4.5 and .Net Compact Framework 2.0, 3.5.
File | .NET Framework Version |
EAGetMail.dll | Built with .NET Framework 1.1
It requires .NET Framework 1.1, 2.0, 3.5 or later version. |
EAGetMail20.dll | Built with .NET Framework 2.0
It requires .NET Framework 2.0, 3.5 or later version. |
EAGetMail35.dll | Built with .NET Framework 3.5
It requires .NET Framework 3.5 or later version. |
EAGetMail40.dll | Built with .NET Framework 4.0
It requires .NET Framework 4.0 or later version. |
EAGetMail45.dll | Built with .NET Framework 4.5
It requires .NET Framework 4.5 or later version. |
EAGetMailCF20.dll | Built with .NET Compact Framework 2.0
It requires .NET Compact Framework 2.0, 3.5 or later version. |
EAGetMailCF35.dll | Built with .NET Compact Framework 3.5
It requires .NET Compact Framework 3.5 or later version. |
The following example codes demonstrate how to use EAGetMail POP3 component to download email from Gmail IMAP server.
In order to run it correctly, please change email server
, user
, password
, folder
, file name
value to yours.
Note
To get full sample projects, please download and install EAGetMail on your machine.
Because Gmail POP3 server doesn’t work like normal POP3 server, it hides old emails automatically even the email was not deleted, so we suggest that you use IMAP4 protocol.
#include "stdafx.h"
using namespace System;
using namespace System::IO;
// Add EAGetMail namespace
using namespace EAGetMail;
int main(array<System::String ^> ^args)
{
// Create a folder named "inbox" under current directory
// to save the email retrieved.
String ^curpath = Directory::GetCurrentDirectory();
String ^mailbox = String::Format("{0}\\inbox", curpath);
// If the folder is not existed, create it.
if (!Directory::Exists(mailbox))
{
Directory::CreateDirectory(mailbox);
}
// Gmail IMAP server is "imap.gmail.com"
MailServer ^oServer = gcnew MailServer("imap.gmail.com",
"gmailid@gmail.com", "yourpassword", ServerProtocol::Imap4);
MailClient ^oClient = gcnew MailClient("TryIt");
// Enable SSL connection
oServer->SSLConnection = true;
// Set 993 IMAP4 SSL port
oServer->Port = 993;
try
{
oClient->Connect(oServer);
array<MailInfo^> ^infos = oClient->GetMailInfos();
for (int i = 0; i < infos->Length; i++)
{
MailInfo ^info = infos[i];
Console::WriteLine("Index: {0}; Size: {1}; UIDL: {2}",
info->Index, info->Size, info->UIDL);
// Receive email from Gmail IMAP server
Mail ^oMail = oClient->GetMail(info);
Console::WriteLine("From: {0}", oMail->From->ToString());
Console::WriteLine("Subject: {0}\r\n", oMail->Subject);
// Generate an email file name based on date time.
System::DateTime d = System::DateTime::Now;
System::Globalization::CultureInfo ^cur = gcnew
System::Globalization::CultureInfo("en-US");
String ^sdate = d.ToString("yyyyMMddHHmmss", cur);
String ^fileName = String::Format("{0}\\{1}{2}{3}.eml",
mailbox, sdate, d.Millisecond.ToString("d3"), i);
// Save email to local disk
oMail->SaveAs(fileName, true);
// Mark email as deleted from Gmail IMAP4 server.
oClient->Delete(info);
}
// Quit and purge emails marked as deleted from Gmail IMAP4 server.
oClient->Quit();
}
catch (Exception ^ep)
{
Console::WriteLine(ep->Message);
}
return 0;
}
The Gmail IMAP and SMTP servers have been extended to support authorization via the industry-standard OAuth 2.0 protocol. Using OAUTH protocol, user can do authentication by Gmail Web OAuth instead of inputting user and password directly in application. This way is more secure, but a little bit complex.
Appendix
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