Handling Multiple Clients With TcpListener?
Jun 25, 2009
I have been programming a TcpListener Program and I have everything working right! So far... Except that when I have multiple clients connecting to my Server... I used a try catch statement to catch the error and it says that tcplistener doesn't allow multi connections... think creating a new thread for each connection sounds like the most reasonible answer but I can't grasp the concept of it...
Here is my frmMain:
Imports System.IO
Imports System.Net
[code].....
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Oct 8, 2011
I posted this code in another thread as an example of how to listen for connecting clients using TcpListener.it is a small part of a larger project, its all my own work,
Imports System.Net
Imports System.Net.Sockets
Public Class Server[code].....
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Jan 8, 2010
I have been struggling to find a solution for this problem. What I need to do is build a server application that accepts tcp client requests from different clients running on same port say:1003. I experimented by using asynchronous mode call backs etc. but it disconnects once connection is established and does not respond for further requests from the same client.
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Mar 8, 2011
i want to designe a simple program that have one server and multiple clients.i program with vb.net,but dont know anything about winsock, can you send me a sample code for start.
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Mar 2, 2011
I have a ASP.Net VB.Net application, which I developed an deployed in about 2004. I have just upgraded it to a new server and IIS 6.0. The application requires users to login from IE it and maintains their State using sessions on the server. I would like the users to be able to have multiple browsers open, each running with unique data on their client system. Is this possible, if so, what do I need to do?
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Sep 21, 2011
l have just written a vb.net application and would like to install it on the server such that various users would access the central database on the server how would l achieve that in vb.net
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Apr 6, 2010
I teach programming at a high school and I have used VB 2005 Express (in a computer lab of 33 clients) for a number of years without a problem. However, this year I switched over to VB 2008 Express and now I am constantly having registration issues. I have found the following ...
1. You must re-register the product for every user on that client
2. Each client must have a unique registration key
3. You are allowed only 30 days of useage without registration
What is happening is I asked my students to register the application themselves. But we keep getting this registration request every time a student switches seats in the room. Now we are getting an error message that says we have had too many registrations from this IP address.Is there a registration key that will work on more than one computer? Is there any way around the registration issue?
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Feb 10, 2010
I'm new to network programming and i'm trying to write a server that can communicate with multiple clients through tcp/ip, the clients need to communicate with the server to and with the other clients. Currently i've got a client server program that works fine for only one client:
[Code]...
I'll guess to accept multiple clients i have to create some clienthandler class at server side, but i have no idea which code it has to contain, i've already spend hours searching on google but didn't find anything usefull. Can somebody help me with this ?
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May 31, 2010
I'm using a SQL database and I'm writing a VB.NET client application. This application is used on multiple computers at the same time. If one of the clients makes an update to the database I would like to have the other clients to be aware of the update.
Has ony one already done this before?
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Sep 22, 2011
I am facing a problem in VB .net Client/Server application where I am successfully able to talk between them using TCPListener and TCPClient class usage. However, when I try to connect another Client to the same server on the same welcome port, it errors out throwing an exception or behaves very unexpectedly.Isn't it true that the Server connection is on a WELCOME PORT for all the clients, and that each client connected gets a new port to carry on its communication with the server AUTOMATICALLY (according to the Tomcat webserver working)
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Dec 12, 2009
I made a simple chat system that connects to a server with a client one on one. I'm not really sure how to get multiple clients with the server so that you can see everyone's messages. Here is the source code. The Server only accepts one client at a time.
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Jun 30, 2009
How can I make a server application? How can I then create another application that is meant for the clients!? I have tried to look for something for over 3 months now. All that stuff about TCP/IP just is not working! Using TCP/IP I cannot connect to anyone out of my network! How can I make it so when you start the client application it will automatically connect you to the server. Then having 2 textbox's and one button that says "Send". One text box will have what has been send and recived and the other textbox will be what you type to then later send it! How can I make it work with up to five clients!?
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Mar 18, 2009
I have a large class that I built to act as a TCP server for one of my silverlight applications. When a user connects it stores the tcp client into a table for later communication. The problem is that when I send data, with more than one client connected, it loops through both open TCP Clients but some how sends the data twice to the same client.... the other tcp client never receives his data. This isn't a logic issue as I can step through the code and see that it is clearly taking each individual TCP client out of the table and sending it the data. They all use the same port... could that be the issue? And if so how do I make it so that it can connect on one port then transfer to another? I have tried using different computers for connecting but still the most recently connected client receives all of the packets of data.
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May 17, 2010
I am developing project on cyber cafe using vb .net 2005 and winsock i don't know how to accept connections from multiple clients to a server having winsock control
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Nov 12, 2010
i am coding in vb2008 express.Can u suggest me any tutorial or sample code for "Handling Data between multiple forms".
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Nov 13, 2009
I have put my business logic in a partial class as suggested in best practices. One of the conditions is that one of four fields of a row has have a value. Setting the errorprovider has no problems when creating a new row in the new row event. All the textboxes in the form show the error condition.
Dim ErrorString As String = "A value is needed for at least one of the " & vbCrLf & "Gallon, Fuel, Oil, or Misc fields"
e.Row.SetColumnError("Gallons", ErrorString)[code]....
The logic that sets them back to a no error condition though only sets the currently focused control in the form to no error. When the error is corrected.
MyFuelRow.SetColumnError("Gallons", "")
MyFuelRow.SetColumnError("FuelCost", "")[code]....
How can you reset multiple column errors at once?
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Sep 13, 2010
i write a server program using vb.net but i can not accept multiple client at same time.
[Code]...
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Nov 23, 2011
I took a VB class a couple semesters ago and I did really well. Unfortunately, it seems as though we only covered the very basics within the class, as I feel rather clueless right now.
Here's my issue. I'm trying to write a program that will encode notes (like music notes, A-G#) which are entered by the user, into digits, 0-9. Now I have the system laid out, in that 1-8 will represent A-A, while a 0 or 9 preceding a digit will represent a flat or sharp respectively.
Now my question is actually rather basic, but I just can't seem to figure out how to do this. The user will enter the note sequence by clicking on buttons (12 of them). What I'd like to do is create one sub that will handle all possible button clicks. I suppose it's possible that I could have separate subs for each and every button; but it just seems more efficient and cleaner to have one sub that manages them all.
The part I have completed and working properly will display a message (the same message) in a messagebox each time any of the buttons are clicked. So I have the "Handles" part working for all 12 buttons. But what I'd like to do is write code, perhaps "If" statements such that If "btnA" is clicked, then say "You clicked Button A," and If "btnASharp" is clicked, then "You clicked Button A Sharp," and so on. Is it possible to do this somehow by recognizing which event was actually triggered?
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Apr 14, 2011
I am creating a program using Visual Basic 2010 Express.
I want to make a Sub handling both MouseHover and MouseLeave events. Is this possible? And if possible, how do I differ between MouseHover event and MouseLeave event?
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Dec 3, 2010
I had a question about handling multiple events in a sub, like this:
Private Sub Form1_MouseUpOrDown(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles Me.MouseUp, Me.MouseDown
'do something
End Sub
Once the sub is called, is there any way to tell which event called it? (Whether it was a MouseDown or a MouseUp event?) Right now, I am doing a work-around as follows... having each event call the same sub and pass the info in. But it would be nice to not have that overhead.
Private Sub Form1_MouseDown(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles Me.MouseDown
ExecuteMouseUpOrDown(EventTypes.MouseDown, sender, e)
End Sub
[CODE]...
Don't use ACCESS, EXCEL, or a TEXT FILE as a database. If you want your program to use a "local database", without any of the hassle of setting up a MS SQL or MySQL server, just click this link: >>> SQLite <<<.
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Aug 10, 2010
I have multiple textboxes which I want them to perform the same thing upon clicking them. By default I can use the handles textbox1.click for 1 single textbox as shown below but I am not sure how to do handle multiples of them. Of course I can write a handler for every single textbox but I have about 50 of them. I am sure there must be a more efficient way. [Code]
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Oct 21, 2009
I am new to VB but I want to find this out. For example there are two objects in my form and when I press W,A,S,D then Object1 should move Up, Left, Down and Right respectively. Object2 moves when I press the arrow keys. How do I make them move together and also separately depending on whether the key is pressed.
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Dec 7, 2010
I started out with just one table called products but I had problems with doing an update; it said sql to complex which was because the product table had nearly 100 columns in. The products table consists of header information like product quality, colour etc. Then there are 3 blocks of columns which mainly consist of a size as being the column name and a quantity as being the value. I have put these in three seperate tables to get around the SQL update problem. My problem is what is the best way to code this. The tables link to the header table using an autonumber primary key.
[Code]...
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Sep 22, 2011
In the Catch of Try-Catch there are the following two properties:
e.Exception.Message.Count()
e.Exception.Message
Does the .Count mean there are multiple lines in .Message? If not, what is the .Count used for?
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Mar 13, 2009
In old VB6, I could set all txtBox controls when members of the same index eg.txtBox(0),txtBox(1) etc., to all do certain things in a couple of lines of code, eg.
Private Sub txtBox_GotFocus(Index As Integer)
txtBox(Index).SelStart = 0
txtBox(Index).SelLength = Len(txtBox(Index))
[code]....
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Aug 6, 2009
How do you handle the screnario wherein multiple data entry forms are open and modifying one could potentially affect the record being modified in other forms?
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Apr 26, 2010
come years ago I bought an activex component to read some basic smartcard data. I created a simple form application and it has worked fine ever since. However, instate of a form application I now want to create a console application for the same purpose (the forms are unrequired and it just takes too long with multiple smartcards).
But I have been working on this for days now and somehow can't seem to get my events working. When I use 1 event, everything works fine, but as soon as I add my second event I get this error:
Unhandled Exception: System.Runtime.InteropServices.COMException (0x80040202): E
xception from HRESULT: 0x80040202
at System.Runtime.InteropServices.ComTypes.IConnectionPoint.Advise(Object pUn
kSink, Int32& pdwCookie)
[Code]...
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Apr 12, 2011
Does anyone have a nice sample of a unit convertor handling multiple unit types that I can integrate in my application? I have found this one, but it is only handling one type of unit. For example I want to convert weight as well as volume from and to imperial units.
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Jan 24, 2010
I have this code to connect to my server:
client = New TcpClient(txtIP.Text, txtPort.Text)
client.GetStream.BeginRead(readBuffer, 0, BYTES_TO_READ, AddressOf DoRead, Nothing)
SendMessage("/CONNECT|" & Label25.Text)
How do I check if the TcpListener is available?
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Apr 22, 2012
I am creating an application that will be talking over the LAN (and eventually, WAN) which uses the Tcplistener and Tcpclient objects.Now, I have this working absolutely fine locally using the loopack address although when I change the IP of the listener to 0.0.0.0 (listening for all IPs) and the IP in the client application, to the IP of the server, it throws an exception when connecting. The client says something along the lines of the the server has rejected the incoming connection. So i disabled all firewalls temporarily but I still have the problem.I have ran netstat on the server which clearly shows that it is listening for an incoming connection on 0.0.0.0. [code]
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