I want creating a online file transfer app. I would like the user to drag-drop an item into the file transfer application to initiate the file transfer just like skype or other messengers. can anyone give me good links or sample code for this
One of the most complex part in the "peer-to-peer" data transfer is session initiation, since user can be hidden behind NAT, firewall or proxy server. You probably should take a look at SIP protocol for session initialization - it is used in many VoIP services. Some time ago I found this SIP tutorial rather descriptive, but there are many other docs.
Also, probably it would be useful to take a look at XMPP protocol (GTalk is implemented with this protocol), there is file transfer extension.
MSRP (Message Session Relay Protocol) is designed to send messages and files. It is used by
SIMPLE messaging systems. If might be worthwhile investigating.
Konnetic are the only provider of MSRP .NET solutions I know of.
Related
I am writing a chat program between a server and a client in C# .Net. Both users, aside from chatting can engage in different activities like remote desktop and playing games together.
I have a few questions:
Multiple threads will be sending and receiving stuff from the client at the same time, that means every option need to identify which packet is meant for him and take data from it ? (Running a remote desktop while transferring a file a same time, the remote desktop thread will see the file packets arriving at stream but should ignore it, right?)
What's a good buffer size to set for the socket I will accept clients in?
Do I communicate in form of specialized class containing the data or try to keep the communication as a byte array I send over the stream?
The questions 2 and 3 are impossible for us to answer because we don't know what the communication and the requirements look like.
As for handling multiple threads: that is hard to get right, I'd use an existing solution.
I suggest you have a look at 0MQ as it might prevent you from reinventing the wheel.
There are .NET client libraries available: http://nzmq.codeplex.com/ and a nuget package http://www.nuget.org/packages/clrzmq/2.2.5 as well.
A good start is The Guide
For a quick example see this C# server and its hello world client in C#
I want to build web based facebook like lightweight chat for my site.
Website build on ASP .net on SQL server 2005.
I am interesetd in XMPP commmunication, but not able to find open source XMPP server with supportedlibrary for C# so that I can create client for my site.
Have checked googling butno luck for C# library; all I could found is plugin and jar.
Is it possible to implement chat logic and XMPP server communication in different language, and accessing thisdata through iframe or by other means on my site.
Thanks,
Hitesh.
http://www.ag-software.de/agsxmpp-sdk/
That library seems to be pretty good.
What you'll want to do is follow jgauffin's suggestion, and use an XMPP library on the backend, and then typically you'd add in a comet server for integration with your web frontend (we've actually done exactly this # Frozen Mountain, using WebSync).
If you're building a smaller site and/or don't need the "realtime" aspect, you could probably get away with polling as well, in which case you'd need to store the results from the XMPP library in your own system, and poll that (since XMPP is strictly event driven).
There are many options to send a message since first human! But how about the intelligence on it, automated collaboration in object level or shared objects among the users etc. I suggest you to take a look for the samples in here and feel the difference.
I'm building a music library program, and I want to have the ability to share the library in the LAN. How can I discover others who share their library? I'd like to find others' libraries without typing in IPs and stuff.
Apple uses mdns (they call it Bonjour) to broadcast and discover music shares on the local network without any user configuration.
Many other manufacturers implement UPnP/AV for the same.
Probably the easiest way is to use UDP to periodically send a message (containing some info advertising your library's presence) to the broadcast address. This will be received by all the hosts on your subnet (and perhaps further, depending on your router configuration). If your app listens for these messages from other hosts, it will over time be able to find all the other instances of your app on the subnet.
Edit: found this question which has answers that go into more specifics of what I'm talking about.
SNMP
This protocol was designed for what you are looking to do.
There are several libraries that you could use that implement SNMP which would make it easy to send and receive.
You could get your application to send the fact that the library is shared to a central server - in fact just send the location.
Other instances of your application could then just ask the server for the list of shared libraries.
The advantage of this is that your application isn't constantly broadcasting.
The disadvantage is that you need a central server.
I would like to track messages sent and received though Windows Live Messenger. I would then like to collate these messages into a database (not in the scope of this question).
The question is how and where should I track these messages. The simplest way it to force all clients to keep history files and read those, but it is not really the solution that I am looking for. Is there a way to track them from a server running in the same domain, I have read a little into Windows Communicator, I have also seen a lot of people chat about http://dev.live.com/messenger/ but I was hoping that someone may have addressed this problem already :)
I would like to do this using C# .NET 3.5
Check out MSNPSharp. Its a .NET msn library. Its very powerful and allows you to sign in from multiple locations. So you can sign in and listen to other conversations happening on a given account.
Its very straight forward to use. Download the full source code, there's a sample application that demonstrates its use in full detail.
http://code.google.com/p/msnp-sharp/
Here is two idea that might work.
The first one is the easiest but can be easily avoided by the user if he doesn't want to be logged. It would be to use MSN Plus over the MSN. With MSN Plus you have an API that let you get all messages from any Chat Windows... and a lot more. Of course, if the user is not you, the user can simply uninstall Msn Plus and your program will not log any data.
The second idea is better if you have a network that you require to check all Msn Conversation. If you use WireShark you can see that conversation are not crypted (well the last time I did it) and you can check the port and protocol to simply get the data from the network.
Hope it gives you a way to what you need.
Just two ideas
1. First the standard MSN protocol is plain text (from what I understand) so you could intercept the messages on the firewall and then put them in the DB and do the correlation there.
2. If this is in an organisation you could use Office Communicator which is the "corporate" version of MSN and has that functionality built in already. You can then just go in via their SDK and get the correlated data.
I managed to find two ways of doing this, though both are not really programmatic solutions, so may not appeal to this audience.
Make use of a Jabber gateway to set up forwards between your jabber client and the other IM networks. Traffic flows between your jabber enabled client and the jabber server via the jabber server. The Jabber server then translates this to the destination networks protocol and forwards the message. Likewise messages from the external IM networks are routed and translated by the Jabber server. An example of this is PSI <-> IceWarp Merak <-> MSN
Make use of Symantec IM Manager to intercept messages from the messaging clients on your network. You will need to either use host files or local DNS rules to convince the your local PCs that Messenger.hotmail.com is actually located at 192.168.0.59 and not at Microsoft.
Hope it helps other people that may want to do the same.
Is there an easy way to create an IM bot on multiple im networks (aim, gtalk, yim, etc) that can accept and interpet specific commands sent to it to perform a server related task?
Lets say for instance I have a website for managing an rss feed. I want to send a command to an IM bot to add another feed to my collection. the IM bot would associate my screen name with my account from prior setup on the website.
I have done some internal bots for my company using the XMPP (Jabber) protocol, I've used the agsXMPP SDK and the Jabber.NET client libraries, I was looking for APIS to work with YIM, AIM and Windows Live Messenger but I've found only COM exposed APIS, nothing for .NET...
But an idea comes to my mind, with the XMPP Protocol you can configure a local server with IM Gateways, that allow users to access networks using other protocols through your server
I use eJabberd, you can install a variety of transport gateways to connect with other IM protocols (AIM, MSN, ICQ, GTalk...
To GTalk you can connect directly using the libraries I mention...
A sample ICQ gateway:
The short answer to this question is yes this can be done relitivly easily. Sedning and receiving IMs sending, receiving and interpreting requests from the network you wish to communicate on and there are libraries available for each of the major IM protocols to make this easier.
For messenger you can try the DotMsn library, I have used it in the past but at that time it was still quite new and I have not used it since so I can't vouch for it's quality.
Jabber uses the XMMP protocol which is an open-standard so there are bound to be plenty of client libraries available.
If I recall correctly Google Talk uses this protocol or a modified version thereof.
I dont have experience with c# but I have written one for AIM and Gtalk using PHP. http://www.imified.com/ is the best place to start if you looking for a easier way to write an IM bot.
Basically you create an account in imified.com .
Name your bot and link a script.
When ever a message is sent to the bot, imified.com automatically runs this script.
Here is a link for you get you started!
We have professional .NET/COM/VCL library for MSN/Yahoo/ICQ/AIM/GTalk/Jabber. Please take a look at http://www.imcomponents.com/ if you like.