NNTP library that supports post retrieval with attachments and a lot more

Introduction

I have built this library because I found that there is lack of support for NNTP. I wanted a library supporting Multilanguage posts with attachments. That required MIME handling, Base64, UUEncode, Quoted-Printable etc. I also wanted a library with Authentication support too.

Using the code

Classes can be classified as below.

BS: NntpConnection
VO: Article, ArticleBody, ArticleHeader, Attachment, MIMEPart, Newsgroup
Util: NntpUtil
Exp: NntpException

Using the library is simple, and it is done mainly by manipulating the NntpConnection class.

Connect to a specified news server and list all the newsgroups:

NntpConnection con = new NntpConnection();
con.ConnectServer(serverName, 119);
ArrayList list = con.GetGroupList();
foreach ( Newsgroup ng in list )
    Console.WriteLine(ng.Group);

Subscribe to a group and list out all the articles:

Newsgroup ng = con.ConnectGroup(groupName);
ArrayList list = con.GetArticleList(ng.Low, ng.High);
foreach( Article article in list )
    Console.WriteLine(article.Header.Subject);

Retrieve an article, examine the text content and save the attachment:

// msgId can be a string or an integer
Article a = con.GetArticle(msgId);
Console.WriteLine(a.Body.Text);
foreach ( Attachment at in a.Body.Attachments )
{
    at.SaveAs(@"C:\Temp\" + at.Filename, true);
}

If you want to provide an identity:

NntpConnection con = new NntpConnection();
con.ConnectServer(serverName, 119);
// Identity will be store and will be sent automatically upon the server request
con.ProvideIdentity(username, password);
// You can force the identity to be sent immediately, 
// however some servers do not support this
con.SendIdentity();

This is a brief description only and my library has many more features. I will review this article if I have time.

More Information

Articles are decoded by self-built library, where it is still far away from the internet standard. However, it should be able to decode over 95% of the posts in the internet. These codes are still under development and will be updated soon.

History

Beta 0.1 2004/03/17
Beta 0.2 2004/03/23
- Enhanced MIME support by optimizing internal implementation.
- Restructured some classes.
- New authentication methods.

License

This article has no explicit license attached to it but may contain usage terms in the article text or the download files themselves. If in doubt please contact the author via the discussion board below.

A list of licenses authors might use can be found here

About the Author

HKcow

Hong Kong

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any updates? like yEnc for example?

ringdrossel

4:49 12 Sep '09

Hi there, really liked your library. Will it be updated? Would be really awesome since I haven't found a single library in the net that is comparable to this functionality. Cheers Sven
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DateTimeFormat errors (It doesn't like the DateTime Object)

undeclared

0:50 9 Jul '07

I think this might be specific to my usenet server, but it has to be able to handle different types of data, I would think. It can't handle it, so now begins my modifications as an attempt to.
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Re: DateTimeFormat errors (It doesn't like the DateTime Object)

undeclared

1:36 9 Jul '07

I fixed it manually. It was a problem with some usenet servers.

There was a line parsing DateTime:
article.Header.Date = DateTime.Parse(values[3].Substring(i+1, values[3].Length-7-i));

in NntpConnection.cs (around line 500)

the fix:
[above the while loop]
string date = null;

Look for the line:

article.Header.Date = DateTime.Parse(values[3].Substring(i+1,
values[3].Length-7-i));

Comment it out and add this:

// 7 usually works
date = values[3].Substring(i + 1, values[3].Length - 7 - i);

if (date.EndsWith(":")) // but if it doesn't, use 5 instead.
{
date = values[3].Substring(i + 1, values[3].Length - 5 - i);
}
article.Header.Date = date;

multiple part attatchements

ThisBytes5

8:57 17 Mar '07

How do you dowload/detect if a message is multiple parts? I am trying to use the app to build some NZB files and need each segment for the NZB file. Thanks Wayne
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Post message

The Will

15:59 3 Aug '06

Howdy... Is there anyway to use your library to post messages with attachements... I have tried and as yet nothing works for it.. Please advise
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Re: Post message

eric.nadeau

8:43 5 Jan '07

I was trying to do the same thing then found this post... I suppose I'll go debug the library and see if it chokes somewhere. Eric / Formark
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Re: Post message

eric.nadeau

3:44 9 Jan '07

Hi, Version 0.2 doesn't support posting with attachments. However I added support for it and emailed a patch to Hkcow. Hopefully it'll make it through. Cheers, Eric
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Re: Post message [modified]

eric.nadeau

4:22 4 Apr '07

There hasn't been any news since I emailed my patch, so I'm attaching it here. It will allow you to post articles with attachments.

It's a diff patch, encoded in Base64. It can be decoded using this online tool: http://rumkin.com/tools/compression/base64.php[^]

Enjoy,
Eric / Formark

PS: The file was originally named 'HkcowNntpAttachments.patch', but it can be named anything really.

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-- modified at 10:35 Wednesday 4th April, 2007

Good Job~

VB.NET / ASP.NET Beginner

8:47 8 Jan '06

似乎你係香港人~所以我照打中文喇我本身都有web base NNTP ,不過都係上sourceforge借人個web-news去改 http://news.hk3ware.com 我本身有用vb.net同asp.net, 前排搵free既 nntp library都未有好彩搵到你呢個寫o即^^
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Arrange Headers ?

nihonsx5

16:56 8 Dec '05

Your nntp library is very useful for me. Thank you. I'm trying to arrange article like multipart article with archive etc... How can I do that ?
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Image Attachments

Dude90210

14:12 10 Aug '05

How do you dowmload the image attachments using your library? Do you have some code to share. I am a little confused. Good job on the library it helped me a lot.
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Re: Image Attachments

Duder90210

15:07 10 Aug '05

Is there something wrong in how the attachments are written? Here is an example: news://newsclip.ap.org/ILSA10908102001@news.ap.org Thanks.
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Confused about onRequest

Kluch

12:18 5 Aug '05

Hello, I have a question about your code that I don't seem to understand. What is the purpose of using the onRequest delagate as opposed to just a standard member? I just am trying to figure it out, was hoping anyone could shed some light on it as I am missing what it does. Thanks, and great job!
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Excellent Job! just one comment :)

Steven Burns

8:58 28 Aug '04

Im experimenting with your library, it works very nice, authentication and everything Cool | :cool:

However, I am connecting to a newsgroup that's sending the dates like this:

"Sat, 28 Aug 2004 07:04:07 -0400 (EDT)" Confused | :confused:

That makes the library crash Frown | :(

To fix it I replaced your 2 calls to DateTime.Parse(value.Substring(...)) with calls to NntpUtil.ParseDate(value) that is a new function I created:



public static DateTime ParseDate(string value)

{

   int i = value.IndexOf(',') + 1;

   int j = value.LastIndexOf(':') + 3;

   return DateTime.Parse(value.Substring(i,j-i));

}

I think this parsing function would get most cases (but ignoring the timezone just as before).

My two cents Big Grin | :-D

Steven Burns

good job

bouli

4:23 11 May '04

Hi there, what a good job! Where did you get all the information about NNTP to write your classes? Best regards. There is no spoon.
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Re: good job

asabit

4:23 26 Dec '04

I hope this is what you are looking for. from "The Internet Engineering Task Force" webpage: http://www.ietf.org/rfc/rfc0977[^] http://www.ietf.org/rfc/rfc0850[^] Asabit
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Sample Project

mdande

19:43 21 Apr '04

Do you have the source for them sample project? The current one does not seem to be working.
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Am I missing Something?

Russell Mangel

1:34 27 Mar '04

I downloaded your source files, and copied all the *.cs files to a new Windows Forms application, and attempted to compile the classes.

I received the following error:

The type or namespace name 'HttpUtility' could not be found (are you missing a using directive or an assembly reference?)

The line of code causing the error is:

sb.Append( HttpUtility.HtmlEncode( msr.ReadToEnd() ).Replace("\n", "
\n") );

Did I miss something?

Thanks
Russell Mangel
Las Vegas, NV
Confused | :confused:

Russell Mangel
Las Vegas, NV

Re: Am I missing Something?

HKcow

3:48 27 Mar '04

Hi, are you compiling the code using visual studio? If yes, you need to add the "System.Web" into your project reference. You could find your project references on the right hand side.
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Re: Am I missing Something?

bouli

4:02 11 May '04

add the reference "System.Web.dll" in your project and it will compile fine. There is no spoon.
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Well Done

JaseNet

18:13 26 Mar '04

There is more than enough here to form the basis of a good newsreader in a very short period of time. Don't be put off by the article 'Binary to Text Encode/Decode Class' as both articles complement each other. This provides the missing Yenc decoder. You have done some good work and saved me a lot of time.

The content of the article makes up for the lack of presentation but can I suggest you include more documentaion in a future release.

thanks

Jason

Re: Well Done

JaseNet

19:22 26 Mar '04

This may help someone. The code has an issue with the variation in time and date formatting found in newsgroups.

DateTime.Parse(values[3].Substring(i+1, values[3].Length-7-i)

is used twice by HKcow and throws an exception when it encounters 'GMT' or 'UTC' etc in the date. A first quick fix during debugging was to change

throw new Exception(response, e);
to
article.Header.Date = DateTime.Today;

and wrap the following with try/catch and again insert todays date.

header.Date = DateTime.Parse(value.Substring(i+1, value.Length-7-i));

Not very elegant I know (yet) but it will get you going.

Re: Well Done

HKcow

20:07 26 Mar '04

I am very happy for your help. I will fix the problem suggested in the next release, I will check for the rfc references and come up with a more flexible solution. About the doc. I don't have experiences on writing a complete doc. Can you suggest some references/tools for me such that I can add comment with specified format in the codes, and a doc could be generated automatically?
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Known Issue

HKcow

13:58 26 Mar '04

I will reply this thread if I discover any issue. Please let me know too if you have found any issue. 2004/3/27 - PostArticle not working I did not try out the post function and I discovered that it is not working correctly. Please change the followling line sb.Append(this.connectedGroup); to sb.Append(this.connectedGroup.Group); if you want to fix it immediately.
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Considered OO design?

zucchini

10:58 23 Mar '04

Have you considered implementing any meaningful parsing logic in the Article/ArticleHeader/ArticleBody instead of writing it all into the connection class, or perhaps placing it in a factory class? Is there a reason you chose to lay out the code the way you did?
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