i write a vb code that it can do connect to serverthe question is when i connect to the server the server have receive the connected and the client exists not found serverit shows out this warning "strData' is passed by reference before it has been assigned a value. A null reference exception could result at runtime."
View 4 RepliesI am trying to create a tcp server, and from I have read I should create a new thread for each connecting client. So This the code I have in my listener thread. I get a error and do not really know how to do it.
While _ListeningStatus = True
'Dim Client As TcpClient = TcpListener.AcceptTcpClient
'If Client.Connected Then
'Dim ClientThread As Thread
'ClientThread = New Thread(AddressOf New ThreadStart(AddressOf ClientThreadProcess(Client)))
[Code] .....
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])
View 9 RepliesIm using the code from [URL] as a starter, most of the code is the same. the chat system works fine but on the client a added a disconnect button "clientSocket.Close()" and as soon as i click that i get errors, on the client, this is the code...
Private Sub getMessage()
For infiniteCounter = 1 To 2
[CODE]...
And this line...
serverStream.Read(inStream, 0, buffSize)
gives me "Unable to read data from the transport connection: A blocking operation was interrupted by a call to WSACancelBlockingCall."
Now im talking the server, after the client clicks disconnect or closes by task manager, looses connection, etc the server crashes and gives me.
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)
[code]....
Multi-User Chat Program (Server & Client) with Main Server?
View 1 RepliesCase : I'm creating an application (desktop application) with VB.NET (actually windows form), and using SQL Server Express 2008 for its database.
[Code]...
I have installed Visual Basic 2008 express edition, but I didn't get SQL server. Therefore, I installed SQL server 2008 separately, and it works fine..But I want to use the SQL server in Visual Basic, but it doesn't show up when i click Add New Item. Is there some way of connecting VB to SQL server?
View 5 RepliesWe 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.
[Code]...
Am having a hard time co be connected to sql server 2008 enterprise edition.i am using oledb in this fashion
db.connectionstring="Provider=SQLOLEDB.1;User id=helen;password=123;Initial Catalog=mydb; Data Source=server"
but it gives this error: Login failed for user 'Helen'/ Is SQLclient a must to be connected to sql server?
I am trying connect to a SQL Server database i have created using Visual Basic.Both reside on my local machine (PAUL-PC).Here is what i have done so far but i am missing something (or more worryingly i have got it completely wrong).[code]So i have an MDI form and i want to make a connection to SQL Server when that form loads.I do not want to use a DSN if possible so am trying to use Oledb. Not sure also of the DataAdaptor declaration as in previous versions i used many years ago it was recordset.I would like to use a trusted connection to connect.
View 5 RepliesMy.Settings.ConnectString = "Data Source=123.132.123.123,3306;
Network Library=DBMSSOCN;
Initial Catalog=Authorities;
User ID=AppUser;
Password=mypassword;"
I've been doing a self studies on visual basic and I thought I've learned a lot but still I realized that I still have something more to learn. I want to learn the basic fundamentals on SQL for its database operations such as adding,editing, and deleting records. I would say I'm new to SQL because as far as I've used VB, I've been using LINQ(Language Integrated Queries) for database operation. I've been doing a lot of research online on how to start and connect to SQL but I find hard to make it on my own cause all I've got is an error during runtime.
[Code]...
basically i just want client to say "C: emp" ENTER
then, server must reply with all its files in c: emp
i have been working on a chat program Server side and client side i have most of the features i was asked to put in but then once i got most of the bugs out i noticed something the server admin could send whispers and alerts to single users but then when you try do do it on the client side it wont work so i looked through it all and found my issue the user list on the client is only a list of the names in server hash table so i was wondering how do i send the hashtable and all of its data E.G. user connection information to the client so that it can send commands to individual users like the server side can
vb
Public clients As New Hashtable()
' This subroutine checks to see if username already exists in the clients
' Hashtable. If it does, send a REFUSE message, otherwise confirm with a JOIN.
[code]....
i tried to send the hashtable over the same method used to send the user names to the client but it cannot convert the hashtable to a string so that wont work so my question is How do i send the hash table to the user from the server then display the username on the client ??
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
[CODE]...
I have one more question. I am connectinag to SQL Server 2008, not express, and I keep getting the "login failed for user "...""[code]
View 7 RepliesI want to connect visual basic 2008 or 2005 to sql server using connection string or something elsejust like in VB6 I'm using a connection string but here at VB express i dont know =(Is there a way just like in asp.net to have connection string using?
View 1 RepliesI'm having a issue connecting to a SQL server from a network drive. [URL]But i'm not sure how to give my assembly a strong name?
View 6 Repliesfirst of all sorry if this is not the right place to post this question. yesterday i bought Microsoft visual studio 2008, so as to develo web application, then i installed it in my pc. after installing it in my pc, i have seen microsoft Sql Server 2005, in my start menu programs. wow that is nice, but now i want to create database and then connect it with visual studio 2008, so how can do that? this is my frist time to use sql server, so where can i create tables and databases? and how can i connect it with visual studio 2008?
View 2 RepliesI have Windows Vista Business on my machine and running visual studio 2005 (Version 8.0.50727.867 (vsvista.050727-8600)) as well as "ENU Service Pack 1 (KB926601)" and "Update for Microsoft Visual Studio 2005 Standard Edition - ENU (KB932232) "I'm trying to connect to SQL server 2008 Express via Visual Basic and I've gone through all the forums to try to resolve my issue and it seems that I have to install " Microsoft Visual Studio 2005 Service Pack 1 Update for Microsoft SQL Server 2008 Support" However, when I try to do this I keep on getting the error "The upgrade patch cannot be installed by the Windows Installer service because the programme to be upgraded may be missing, or the upgrade patch may update a different version of the programme.
View 9 RepliesI've basically made a basic tcp server/client application. The thing is that I'm behind a router and so will be the other people that use my clients. I've had to use port-forwarding or the software "rinetd"to run quite a few applications online.
Let me explain: I'm on a lan network that connects to the internet. Whenever I want to host a server - for instance a basic ftp or http server. If I give my external IP to anyone, they won't be able to access my server. Even if I portforward, it doesnt work. I have to use rinetd here. For other applications, portforwarding works. I'm not sure how these things work at all.
Anyway, my issue now is that I have created this server/client application. I'm having serious doubts that if I run the server, I'll have to either a) portforward or use rinetd to get people to connect to my server. IF I need to portforward, that's fine. However, using rinetd would really suck... My 2nd concern is as follows: IF the person running the client is in a similar situation as me (i.e he's on a lan that has a router which connects to the net), will he have to portforward or use rinetd as well? If he portforwards that's fine. But I don't think I could get people to use rinetd.... Also, if there are more than 1 person on a lan trying to connect to my server, there is a big problem when they try to portforward: they will only be able to allocate one of their internal ip to that port, and the others won't be able to connect, right? How does this work? I mean, I use many softwares like msn/skype/(some games)/firefox that do not need portforwarding/rinetd. Yet they work. My housemates(other people on the lan) use the same softwares, and it works fine. There's no clash/probs watsoever How come these run fine?
Anyway, back to my issues. Given I have no knowledge about how the above work, I was wondering whether there was a way to host a vb .net server application on an external website (external to my house) so that I might *avoid* the above mentioned problems, and to what extent that would be a sound solution.
procedure to create a FTP Server and Client program in VB 2008 with sample code?
View 2 Repliesi wan't to create a tcp client and server
Client contains 1 textbox
Server contains
dim pcdetails as string
pcdetails = "Operating System Name : " + My.Computer.Info.OSFullName.ToString + " ; " + "Platform : " + My.Computer.Info.OSPlatform + vbNewLine + "Operating System : " + Environment.OSVersion.ToString + " v." + Environment.OSVersion.Version.ToString + vbNewLine + "Computer Name : " + Environment.MachineName.ToString + vbNewLine + "User Name : " + Environment.UserName.ToString + vbNewLine + "System
[code]....
i have lots of confused ideas like should you transfer files using tcp? Example: I was thinking, I connect to server from client, open file in binary, division by packet size(bytes), send first packet to server, get request if file was delivered succesfully, send next packet. If I do it this way i would need something to know/increase packet size.
View 5 RepliesI'm making a program that would require me to send data between to different machines.The way i plan to do this is to have a server program constantly running on my computer.(any other way to do this?) When someone opens the Client program, the program connects to the server. The server then takes the users I.P address and Username and adds it to a listbox on the Server application. Then the server application constantly updates the list of users on the Client application. So that way every user can see everyone that is connected.Then, when the user wants to connect to another user - They select the Username from their listbox of users. Then all connections will be handled between the users = Each user is connected to the other user's Client program. Well there is the first thing i don't know how to do.The next is simply how i send the data between the users. Would i use a winsock control?Example: One user does an action. The winsock control sends the text "blue" to the other user. The other user's program's form color changes to the color blue. That's not what this program will do, but it's just an example.
View 6 RepliesIs is possible for the server to give all clients that are connected to it a separate threading starting from 1-2-3-etc that will be display there username on a listview. Server can now connect to any of them by clicking on one of the items in the listview.
EX: Multi-Clients Connect to server ---> Server gives each one a separate thread starting with 1 ----> Client sends username to server -----> Server displays them on listview ---> Server can now double click or whatever on the item ---> Pulles up thread count and connects to it.
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.
View 14 RepliesI need to have a 32 bit oracle client installed my test PC which is acctually a 64 bit machine.when i try connecting to oracle in my window application in vb.net ,it does not open the connection.
Imports
Oracle.DataAccess.Client
Public
[Code].....
I'm not even sure where to start. I would like to create something like the ADO DataReader but that works in a TCP Client/Server scenario.Basically, in the TCP Client, I want to be able to call a certain command in the TCP Server which will return a DataReader like object, which I can then iterate through such as:
while dr.Read from the client. In each loop, I would parse out the various fields as in a normal DataReader.The reason I want to do this is to gain the inherent efficiency of the DataReader object since it doesn't first load ALL of the data. To my understanding, the typical TCP Client/Server setup using streams, would first load all of the data on the server, then transport ALL of that data to the client for processing. I want to avoid that, and just stream the data as the client requests through the Read() command which means the connection will remain open to the server while the Read() command is being issued by the client, or until explicitly closed by the client.