I am trying to code a client - server program. I have 4 winsock controls on my main form. The client is able to connect to a free one just fine, and can figure out if they are all in use. When testing my program, I found that when I try to send data through a socket, then send different data directly after, it jumbles the data together.
CODE:
That is the code I am using. When the client is connected to the server, and ready for data, it sends the packet "@Ab". When the server receives this packet, It is supposed to send the welcome alert, and then current events posted in the server.
On the client side, there is a message box that is supposed to show the welcome alert, and at the bottom on a status strip, the current events are supposed to be listed.
When the welcome alert shows, it contains the alert text fine, but then shows the packet for the events after it.
I am currently learning how to program in VB and am using sample code to make a VB Winsock client and server. I beleive the sample code was from VB 6.0. [code]Overload resolution failed because no accessible 'GetData' accepts this number of arguments.I am getting the exact same error in the exact same place in the server aswell. I have tried removing the vbString, but it comes up with a warning and the program doesn't function like it should. I am programming this in Visual Basic 2010 Express.
I want to make a basic winsock chat server and client, and I just need to know the basics, like.How do you determine where to send the data?How do you determine where to receive data from?How to actually send and receive the data?I just don't want to read from a website that has a lot of extra information. I just want to start off with the basics so I can actually learn.
The problem I have is: When I click on cmdListen in the server form and cmdConnect in the client form,both programs won't respond and they crash for some reason I don't know.
Client source code:
Code:
Imports System.Net.Sockets Imports System.Text Public Class Form1
[CODE]...
Code: Imports System.Net.Sockets Imports System.Text Public Class Form1
I have been reading through Atheists posts in regards to client-server and TCP client/server connection's. But how do i go about writing a program with 1 client and server where the client side creates a text file.Once the server sees there is a text file it connects and downloads it to itself or the client pushes the text file to the server.Once on the server i will read the text file and put its info into a sql db.
I made a simple TCP server (I've found the example on the web) in VB to receive data from about 40 TCP clients.The clients are not synchronized but sends data about every 18 minutes; the problem is sometimes several clients sends data at the same moment, so I can't receive data.I also made a second program that reads the data (server program writes data on a file, read from the second program) scheduled.
My question is this: I've seen on the web examples about Multithreaded Server Socket Program, so I suppose this could manage my 40 clients (but now the clients are syncronized and send data at the same time in client mode) or is better get data (I have a central client that asks data to all 40 devices in server mode)?
Second question: can I make a single program where I run both TCP client and TCP server at the same time?
I am creating a very simple Voting System, that will be use on electing new set of officer in a teacher cooperative...
So I have to create two separate program, a Server Program that will manage all the information in the election and a Client Program where voters will vote their selected candidate...
The election officers wanted that the Server Program will display the Voting Results at real time... So when the Voter finished voting, The Voting Result displayed by the Server Program will also be updated every time the Client Program Insert the data to Database....
An action listener in Server Program that will execute if new data is inserted in a Table in the Database made by the Client Program...
I've had a problem which Mike has kindly helped me with here: url..I now ahve a problem when disconnecting then trying to connect again. The app works fine once, but throws the exception again if you try to connect the client a second time.
how to create a client/server... But I couldn't... I don't want anything fancy. Just want the client to send the server 4 numbers, depending on the user's choice; after that, the server would turn off the pc, restart it, etc. It all depends on the number received. Is there a rather "simple" way to do it? If it's not to much trouble you could use Atheist's example. (Btw I don't understand the code and, yes, I've checked on [URL])
Hey guys, I am trying to send data from client to server (encrypted) and the string sent from the client is not the same as recieved from the server. I've been killing my brain for hours to get this to work but I cant manage. Im converting everything to Base64 string.
Client:
Public Sub SendMessage(ByVal msg As String) Try SyncLock myclient.GetStream sw = New IO.StreamWriter(myclient.GetStream)
I have been working on a server and client tcp/ip program and am having some issues. I start the server and then start the client, and the connection always fails. I don't know what's going wrong. Here's the
I have a TCP connection code for client and server communication. It's not meant to be malware but it collects the clients computer information and then connects to the server.
It successfully "connects" but then immediately disconnects.Here is the code for the server:
Dim Listener As TcpListener Dim Client As TcpClient Dim ClientList As New List(Of ChatClient) Dim sReader As StreamReader
[Code]...
I have port forwarding all done and it works if I run the client and server on my own machine. If I run the client on another machine though It gives me a message box saying that it connected with the clients remote IP and at the same time it tells me it disconnected. The client never sends the system information. What is the problem?
I have a user app written in VB which up till now has relied on winsock to connect to another device we have. The user app logs onto the device and then send / receives status reports from it which are used to set the controls on the apps forms.
This has all worked well for a long time but I'm now looking to move away from Winsock as I know it's not 'the right way' to do things and I also need to be able to send non ascii characters between the app and the device it's connected to (implementing multi language support).
The issue is with Winsock it would simply throw the DataArrival event when a message was received and I could then process the message and act upon it. When using a TcpClient socket connection I'm running into problems as all responses are on the socket thread which means I can't simply change controls on the main form without using the Invoke check.
What I want to be able to do is have the thread running the TcpClient simply alert the main form thread when it receives data and make that data available to the main thread so it can start processing it and triggering all the other functions etc required (these also interact with the Form). Whilst this is happening the TcpClient monitors any further messages and sends response messages as requested from the main thread.
I have been a web developer for a number of years now and I am making the move over to form based applications. I am trying to do what I believe should be relatively simple, yet I have no idea where to start.At home I have a machine that family members tend to use P2P programs, which causes my online gaming to suffer with glitches.I want to create a server and client program.where the client app (on my laptop) consists of only one button, when the button is pressed I want the server app (my Desktop) to kill the P2P program.I already know how to kill/start the application in question.I have previously done something similar but I had used winsock (not in VS2010) and was a long time ago.
1) Sending a value/string from the client app
2) receiving the value/string on the server app
I was told to look into the system.net.sockets namespace, but I haven't found anything on the web or here that isn't a full project / over-engineered "Basic Tutorial" that helps to break this down
I Want To Create A Server Program On My Computer AndClient Program That Can Run On Other Computers, The Client Program Will Connect To The Server On My Computer, But I Don't Know Code To Do This.
I am trying to create a server/client program in vb.net. What I am trying to do is test a battery that is running on a handheld (which runs Windows CE 5) by connecting to a "server" and sending information every 10 seconds or so. I am very new to .NET, and am not really sure how to go about doing this. I want two separate applications running, with the server-side keeping all of the data, since the battery is going to die, and I will lose any information if I keep it client-side. I am also new to networking, so I was not sure of whether I should create a Socket, or if I should try to do something else.
Is there any chance who can give me a sample code for client-server applications using vb.net 2008 express edition/professional edition?
1. What SQL Server should I use? Can we use SQL Server 2000 for Client-Server application as my back end database? and will use the vb.net 2008 express edition as front end?
2. If we use these two components (SQL Server 2000 (Back-end) + (VB.Net 2008 Frontend) do you think this will works properly?
3. If this is possible by accessing via code? then please send me connection string.
4. Is there any database server we can use? asides from sql server? where we can implement client-server applications? how about oracle? MySQL Database Server?
i made a program that uses sockets to connect the server to client but there is a problem with it when i try it on this ip"127.0.0.1"wich is not a real ip just a loopback to my computer it works just fine when i use my local ip it works as well when i use my main ip from http:whatsmyip.org it doesnt work at all i dont know why it doesnt say an error or an exception but its not connecting so i gave the server to a friend of mine i tried using both his real ip and his local but still not working i dont know why?i mean i am 100% sure of my code...
The client would need to be able to communicate with the server for several simple tasks, such as checking if the file on the client is different from the file on the server. Or issue a "create folder" command. And of course the file transfer itself.[code]...
I'm trying to make a Client that will automatically run a .DLL that I have created and send information over port 80 to my Server program that will take that data and import it into a database for me. Problem is, I don't know where to start as I have never done this before. I want to do this in VB .NET as this is the programming language that I know. What are methods of doing this? Is there sample code out there for something like this? My google searches are failing me.
A better layout of what I'm trying to do:1. Client Runs .DLL, retrieving information from an Excel file.2. Client takes these properties with the data it contains and sends it to a program outside of the local network through port 80, my boss refuses to let me use any other port.3. Server accepts the data and builds its own properties to be imported into my Access Database.4. Repeat over, and over, and over, and over.
I plan for the server application to be a console application, and the client to be a windows form.
We are creating a Who wants to be a millionaire style game in VB. Our server is pulling information such as questions and answers from a Access Database and sending them to the contestants (Clients). All transfer of information is directly from the server to each client. One of the "Life Lines" we want to use is "Ask a friend", where one client is able to Instant message another client for a short time to get help on the question.
I am Working on Teghax Component.Using This Component we want to find out Block title attribute of dwg file in a client server socket application.
1> We get Block title attributes properly of dwg file in windows application form using the getattribute function().
2> We get Block title Attributes properly in that way:-We take a class library where we take a class.in this class we use getattribute function().Then We access the particular class from another project
But when we use the same class(Keep same structure) in client server socket program.Then it gives an exception.i.e ,"Spaicfied cast is not valid"I am Not getting any reply form teghax developer..I attached exception screen sort.Give me Suggestion How to solve this Exception
Code given Bellow :
Public Function Get_DwgFileAttribute(ByVal Sender As ClsTcpConnection, ByVal msgTag As Byte, ByVal message As String) As String Dictionary = GetHashtable(message) Dim varfilepath As String = CStr(Dictionary.Item("filePath"))
