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Topic: Easier way of downloading attachment

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dr0zaxx
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Joined: 24 July 2009
Online Status: Offline
Posts: 8

Posted: 08 February 2010 at 11:20pm \| IP Logged

I've been trying the examples from the documentation but to no avail.

Either downloads are repeated, null reference etc.

foreach (Envelope env in envs)
             {
                Console.WriteLine("Message #" + env.MessageNumber + " info:");
                if (env.IsValid)
                {
                     env.MessagePreview.Attachments[0].GetData();

gives error.

Getting the mime parts is a hassle and doesnt always work right and will get repeated downloads.

dr0zaxx
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Newbie

Joined: 24 July 2009
Online Status: Offline
Posts: 8

Posted: 08 February 2010 at 11:44pm \| IP Logged

using System;
using MailBee;
using MailBee.ImapMail;
using MailBee.Mime;

class Sample
{
    static void Main(string[] args)
    {
        Imap.LicenseKey = "MN200-35FDFDAFFDA4FD93FDD89634F397-644B";
        Imap imp = new Imap();

        // Connect to the server, login and select inbox.
        imp.Connect("imap.gmail.com");
        imp.Login("xxx@gmail.com", "xxx");
        imp.SelectFolder("Inbox");

        // Download body structure.
        //EnvelopeCollection envs = imp.DownloadEnvelopes(imp.MessageCount.ToString(), false,
        //    EnvelopeParts.BodyStructure, 0);

        int start = imp.MessageCount - 9;
        if (start < 1)
        {
             start = 1;
        }
        EnvelopeCollection envs = imp.DownloadEnvelopes(
             start.ToString() + ":" + imp.MessageCount.ToString(), false, EnvelopeParts.BodyStructure,0);

        // The list of FETCH keys to request from the server.
        System.Collections.ArrayList fetchRequestKeys = new System.Collections.ArrayList();

        // The list of FETCH keys to expect from the server in return to the request of
        // items listed in fetchRequestKeys.
        System.Collections.ArrayList fetchResponseKeys = new System.Collections.ArrayList();

        // UID of the message for which we received the body structure.
        long uid = 0;

        foreach (Envelope env in envs)
        {
             // Get body structures of all MIME parts as flat list.
             ImapBodyStructureCollection parts = env.BodyStructure.GetAllParts();
             foreach (ImapBodyStructure part in parts)
             {
                if (part.ContentType.ToLower().IndexOf("application/octet-strea m") > -1)
                {
                      // For each image, we request its MIME part header and body
                      // (the IMAP4 protocol does not support getting the entire MIME
                      // part as a single block of data). Also note using .MIME instead of .HEADER
                      // because some mail servers don't support .HEADER syntax.
                     fetchRequestKeys.Add("BODY.PEEK[" + part.PartID + ".MIME]");
                     fetchRequestKeys.Add("BODY.PEEK[" + part.PartID + "]");

                      // For BODY.PEEK[...] request the server will return BODY[...] response.
                     fetchResponseKeys.Add("BODY[" + part.PartID + ".MIME]");
                     fetchResponseKeys.Add("BODY[" + part.PartID + "]");
                }
             }

             // Second time, we'll get message by its UID. This will avoid the situation
             // when new message arrives between two queries (and thus it could be possible
             // to download wrong message second time).
             uid = env.Uid;
             if (uid > 0)
             {
                // Download images.
                envs = imp.DownloadEnvelopes(uid.ToString(), true,
                     EnvelopeParts.Uid, 0, null,
                     (string[])fetchRequestKeys.ToArray(typeof(string)));

                foreach (Envelope env1 in envs)
                {
                     for (int i = 0; i < fetchRequestKeys.Count; i += 2)
                      {
                          // Get MIME part header data.
                          byte[] mimePartHeader = (byte[])env1.GetEnvelopeItem(
                               (string)fetchResponseKeys, true);

                          // Get MIME part body data.
                          byte[] mimePartBody = (byte[])env1.GetEnvelopeItem(
                               (string)fetchResponseKeys[i + 1], true);

                          // Build MIME part data from header data and body data.
                          byte[] mimePartData = new byte[mimePartHeader.Length + mimePartBody.Length];
                          Buffer.BlockCopy(mimePartHeader, 0, mimePartData, 0, mimePartHeader.Length);
                          Buffer.BlockCopy(mimePartBody, 0, mimePartData,
                               mimePartHeader.Length, mimePartBody.Length);
                          mimePartHeader = null;
                          mimePartBody = null;

                          // Build Attachment object from the MIME part data.
                          MimePart part = MimePart.Parse(mimePartData);
                          Attachment picture = new Attachment(part);

                          // Save the image into C:\Temp folder.
                          picture.SaveToFolder(@"C:\Temp", false);
                     }
                }
             }
        }
        imp.Disconnect();
    }
}

with some modifications. Tested it on a test gmail account with 3 messages with attachments.

Results:

No of copies: 1 from attachment A
2 from attachment B
3 from attachment C

I might be missing something but the download only occurs after each forloop.

dr0zaxx
Newbie
Newbie

Joined: 24 July 2009
Online Status: Offline
Posts: 8

Posted: 08 February 2010 at 11:51pm \| IP Logged

After looking at the code harder, I realized i forgot to Clear() the ArrayList after each loop which causes the previous data that was added to be used. Sorry! My bad! But still IMAP is a pain :(

paulfinn31
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Newbie

Joined: 28 October 2009
Location: United States
Online Status: Offline
Posts: 3

Posted: 25 February 2010 at 11:49am \| IP Logged

I totally agree. IMAP is sometimes a pain.

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