如何通过imap获取gmail的附件。 [英] How to get attachments of gmail through imap.

问题描述

我正在使用AE.NET通过IMAP从Gmail获取邮件。我能够获取消息，但是当我尝试迭代消息附件时，没有消息。返回message.Value.Attachments.Count（）给我0.请看下面的代码：

  using （ImapClient ic =  new  ImapClient（  imap.gmail.com，  test ***** @ gmail。 com，  ******，ImapClient.AuthMethods.Login，  993 ， true ））
 {
  //  打开邮箱，不区分大小写 
 ic.SelectMailbox（  INBOX）; 
 
  //  根据标记Undeleted（）获取消息。 
 Lazy< MailMessage> [] messages = ic.SearchMessages（SearchCondition.Undeleted（）， false ）; 
 
  int  count = messages.Count（）; 
 
 Response.Write（count.ToString（））; 
 
  //  处理每条消息 
  foreach （Lazy< MailMessage> message  in  messages）
 {
 MailMessage m = message.Value; 
 Response.Write（ < br />）; 
 Response.Write（m.From.Address）; 
 Response.Write（  ---）; 
 Response.Write（m.Subject）; 
 Response.Write（  ***）; 
 Response.Write（m.MessageID）; 
 Response.Write（  %%%）; 
 Response.Write（m.From.DisplayName）; 
 
  if （m.Attachments.Count >   0 ）
 {
  //   ExtractString（m。主题，（，））;  
 
  foreach （附件附件 in  m.Attachments）
 {
  string  fileName = m.Subject +    _ + attachment.Filename; 
 attachment.Save（ @  D：\ DemoMail \ + fileName + Path .GetExtension（attachment.Filename））; 
} 
} 
 
 
} 
 
} 

解决方案

这段代码将是我已经开发和测试的完整版本的vb版本，只是将此代码转换为c＃，所以我将发布vb代码以供参考。它包括用于保存所选文件夹附件的片段，以及将CSV格式的cc和bcc保存为字符串变量：



VB代码 < br $> b $ b

 公共  Sub  fetchMails（）
  Dim  imapClient  As  新 Imap4Client（）
 ' 登录邮件 
  Dim  mailNumber 作为 整数 =  10   阅读第10封邮件 
  Dim  notYetProcessedBox  As  Mailbox = imapClient.SelectMailbox（ 收件箱）
  Dim  msg  As  Message = notYetProcessedBox.Fetch.MessageObject（mailNumber）
 ' 阅读cc和bcc  
  Dim  mailCC 作为 字符串 =   
  Dim  mailBcc 作为 字符串 =   
  Dim  cc（） As  ActiveUp。 Net.Mail.Address = msg.Cc.ToArray（）
  Dim  bcc（） As  ActiveUp.Net.Mail.Address = msg.Bcc.ToArray（）
 对于 每个地址作为 ActiveUp .Net.Mail.Address 在 cc 
 mailCC& = address.ToString 
  Next  
 对于 每个地址 As  ActiveUp.Net.Mail.Address 在 bcc 
 mailBcc& = address.ToString 
 下一步 
 ' 用于保存附件 
  If  msg.Attachments.Count<>  0  然后 
 如果系统.IO.Directory.Exists（  ../ email_attachment /）=  False  然后 
 System.IO.Directory.CreateDirectory（  ../ email_attachment /）
 msg.Attachments.StoreToFolder（  ../ email_attachment /）
 结束 如果 
 结束 如果 
 结束  Sub  
 

C＃代码

  public   void  fetchMails（）
 {
 Imap4Client imapClient =  new  Imap4Client（）; 
  //  登录邮件 
  int  mailNumber =  10 ; 
  //  阅读第10封邮件 
邮箱notYetProcessedBox = imapClient.SelectMailbox（ 收件箱）; 
消息msg = notYetProcessedBox.Fetch.MessageObject（mailNumber）; 
  //  阅读cc和bcc  
  string  mailCC =  ; 
  string  mailBcc =  ; 
 ActiveUp.Net.Mail.Address [] cc = msg.Cc.ToArray（）; 
 ActiveUp.Net.Mail.Address [] bcc = msg.Bcc.ToArray（）; 
  foreach （ActiveUp.Net.Mail.Address地址 in  cc）{
 mailCC + = address.ToString; 
} 
  foreach （ActiveUp.Net.Mail.Address地址 in  bcc） {
 mailBcc + = address.ToString; 
} 
  //  用于保存附件 
  if （msg.Attachments.Count！=  0 ）{
  if （System.IO.Directory.Exists（  ../ email_attachment /） ==  false ）{
 System.IO.Directory.CreateDirectory（  ../ email_attachment /）; 
 msg.Attachments.StoreToFolder（  ../ email_attachment /）; 
} 
} 
} 

这篇文章应该让你去



使用C＃的IMAP客户端库 [ ^ ]

I am using AE.NET to get mail from Gmail using IMAP. I am able to get the messages, however when I try iterate over the message attachments there are none. Returning message.Value.Attachments.Count() gives me 0. Please see my code below:

using (ImapClient ic = new ImapClient("imap.gmail.com", "test*****@gmail.com", "******", ImapClient.AuthMethods.Login, 993, true))
               {
                   // Open a mailbox, case-insensitive
                   ic.SelectMailbox("INBOX");

                   // Get messages based on the flag "Undeleted()".
                   Lazy<MailMessage>[] messages = ic.SearchMessages(SearchCondition.Undeleted(), false);

                   int count = messages.Count();

                   Response.Write(count.ToString());

                   // Process each message
                   foreach (Lazy<MailMessage> message in messages)
                   {
                       MailMessage m = message.Value;
                       Response.Write("<br/>");
                       Response.Write(m.From.Address);
                       Response.Write("---");
                       Response.Write(m.Subject);
                       Response.Write("***");
                       Response.Write(m.MessageID);
                       Response.Write("%%%");
                       Response.Write(m.From.DisplayName);

                       if (m.Attachments.Count > 0)
                       {
                           // ExtractString(m.Subject, "(", ")");

                           foreach (Attachment attachment in m.Attachments)
                           {
                               string fileName = m.Subject + "_" + attachment.Filename;
                               attachment.Save(@"D:\DemoMail\" + fileName + Path.GetExtension(attachment.Filename));
                           }
                       }


                   }

               }

解决方案

This code will be help full i had developed and tested vb version only just converted this code to c#, so i will post the vb code for reference. it includes snippets for saving attachments to selected folder and also for save cc and bcc in CSV format to a string variable:

VB Code

Public Sub fetchMails()
          Dim imapClient As New Imap4Client()
          ' login to the mail
          Dim mailNumber As Integer = 10 'reading 10th mail
          Dim notYetProcessedBox As Mailbox = imapClient.SelectMailbox("Inbox")
          Dim msg As Message = notYetProcessedBox.Fetch.MessageObject(mailNumber)
          ' To read cc and bcc
          Dim mailCC As String = ""
          Dim mailBcc As String = ""
          Dim cc() As ActiveUp.Net.Mail.Address = msg.Cc.ToArray()
          Dim bcc() As ActiveUp.Net.Mail.Address = msg.Bcc.ToArray()
          For Each address As ActiveUp.Net.Mail.Address In cc
              mailCC &= address.ToString
          Next
          For Each address As ActiveUp.Net.Mail.Address In bcc
              mailBcc &= address.ToString
          Next
          ' For saving attachment
          If msg.Attachments.Count <> 0 Then
              If System.IO.Directory.Exists("../email_attachment/") = False Then
                  System.IO.Directory.CreateDirectory("../email_attachment/")
                  msg.Attachments.StoreToFolder("../email_attachment/")
              End If
          End If
      End Sub

C# Code

public void fetchMails()
{
	Imap4Client imapClient = new Imap4Client();
	// login to the mail
	int mailNumber = 10;
	//reading 10th mail
	Mailbox notYetProcessedBox = imapClient.SelectMailbox("Inbox");
	Message msg = notYetProcessedBox.Fetch.MessageObject(mailNumber);
	// To read cc and bcc
	string mailCC = "";
	string mailBcc = "";
	ActiveUp.Net.Mail.Address[] cc = msg.Cc.ToArray();
	ActiveUp.Net.Mail.Address[] bcc = msg.Bcc.ToArray();
	foreach (ActiveUp.Net.Mail.Address address in cc) {
		mailCC += address.ToString;
	}
	foreach (ActiveUp.Net.Mail.Address address in bcc) {
		mailBcc += address.ToString;
	}
	// For saving attachment
	if (msg.Attachments.Count != 0) {
		if (System.IO.Directory.Exists("../email_attachment/") == false) {
			System.IO.Directory.CreateDirectory("../email_attachment/");
			msg.Attachments.StoreToFolder("../email_attachment/");
		}
	}
}

This article should get you going

IMAP Client library using C#[^]

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