Recently, i found my application, which's developped under Delphi.NET, the socket callback function never get called, causing the socket message cannot be sent to the target client.
Is it possible a bug of the socket class in Delphi.NET? Or will it be relative to the Anti Virus software, or something else? Since this problem only happen in some workstation, but not all my testing environment.
Thank you.
Finally, i've got the answer, it's just because .NET Framework 1.1 hasn't been installed in the workstation, once installed, all goes fine
You're highly likely sending it to the wrong endpoint. Make sure your socket is connected before sending messages.
Until we see some code we're unable to help you any further.
Related
In a client - server type system, it would simplify my server code somewhat if the client could indicate if it was trying to make a new connection or was attempting to reconnect after a connection failure.
I realize that in reality a new connection is a new connection, period. But by passing this one extra bit of information it would simplify my server's handling of the situation - which threads and data areas can be reused and which threads should be killed, etc. By not having this one extra bit the server is forced to assume reconnection when possible, and then reassess that assumption when the first message arrives, where the client indicates whether it is attempting to revive the previous conversation or wishes to start a completely new relationship.
I'm guessing the answer is no, but any suggestions are welcome.
By the way, the client is an Android program and the server is .Net Windows.
I'm guessing the answer is no
The answer is no.
but any suggestions are welcome.
Either (a) it should be obvious from your application protocol whether the client is connecting or reconnecting, or (b) it shouldn't make any difference which it is. Much more usually, (b).
How can I realise VB.Net to send a Packet with enough information to log on into a Minecraft Server? I have these lines of codes, but I don't have a minimal idea how to get the received information that i have requested from the server :/
Dim MySocket As New TcpClient(IP, Port)
Dim Socket As New Wrapped.Wrapped(MySocket.GetStream)
Socket.writeInt("4")
Socket.writeString("localhost")
Socket.writeShort("25565")
Socket.writeInt("2")
My final idea is to login into a server and keeping on it. I have read some things on this site, but i'm still confused: http://wiki.vg/Protocol#Handshake
Thanks for any help :)
Check out this library, it may help. It's probably also outdated though, I doubt it's been updated for newer server versions.
http://www.minecraftforum.net/topic/914851-csharp-c-minecraft-client-class/
Here is a link to some more network libraries to connect .NET to Minecraft.
http://wiki.vg/Library_List
I'm trying to get into an implementation of some kind of push notification for a Windows WPF client application and a java backed server.
The idea is to avoid as much as possible polling the server, so I thought to implement it with sockets and messages, and relying in some easy pulling solution in case a socket connection could not be done, (Firewalls, etc).
In the other hand is important that the data traveling get encrypted.
So I have a couple of question/"request for opinions" more related with the WPF client:
Perhaps already exist some solution for that, any tips?
Could be good to think in some SSL sockets connections for that?
If 2 is OK, there is some native solution for secure sockets in .net or any library?
If sockets solutions is an option, I guess i need to go through port 443 and by the way it will avoid many problems with firewalls and so on, am i right?
I know there is many question but all are related to the same problem.
Thanks in advance.
http://clientengine.codeplex.com/
Yes, SSL is good if you need to keep the data secure during transfer
Yes, http://clientengine.codeplex.com/ indicates it supports SSL/TLS
Well, it depends on whether you are controlling the server or not. If you have control over it you can use whatever port you want.
I'm working on a personal project. It's to recreate server software for the game "Chu Chu Rocket" for the Sega Dreamcast. Its' servers went down in 2004 I believe. My approach is to use dnsmasq to change the originl hostname that the game originally connected to, to my own system. With a DC-PC server set up, I have done just that, now instead of it looking up a non-existent dns record, it connects to my computer which will eventually run the server software. I've used tshark (cli wireshark) to capture what's going on between the client (dreamcast) and the server (my computer). The problem is, I'm getting data, but I'm not sure how to interpret it, I don't know what it's saying, but I'm sure it can be done because private PSO servers were created, those are far more complex.
Very simply, where would I go about learning how to interpret data packets, and possibly creating packets that will respond to such queries from the client?
Thanks,
Dragos240
If you can get the source code for the server software on your PC, then that is the best place to look.
Otherwise, all you can do is look at the protocol, compare runs, and make notes of similarities and differences. With any luck, the protocol won't be encrypted.
Does JavaMail support notification of new emails through server-push?
If yes, where is the documentation for that?
If no, is there a library that can do it?
You should be using IMAPFolder's idle function to issue the idle command to the server. That will then listen for events, such as a new mail or deleted mail. (See the IMAP spec to see what the messages look like). And you should be using a MessageCountListener to execute code when a number of emails in the mailbox change.
IMAP's idle function is exactly meant to imitate "push" functionality.
http://java.sun.com/products/javamail/javadocs/javax/mail/event/MessageCountListener.html
http://java.sun.com/products/javamail/javadocs/com/sun/mail/imap/IMAPFolder.html
Sorry I didn't post any code that shows how this is used. I didn't want to waste my time since there are many readily available examples on the internet if you search for this stuff.
But be forewarned, this method won't work for more than one IMAP account since the idle command blocks. Unless you want them all on different threads (bad idea).
A Store event listens for notifications issued by your backend store:
http://java.sun.com/products/javamail/javadocs/javax/mail/event/StoreEvent.html
But in my experience the java mail docs are so thin in places, that the best way of finding out what is going on, is to debug through the process yourself.
This is a great allround resource as well; the JavaMail FAQ :
http://www.oracle.com/technetwork/java/faq-135477.html