i need to check if a port is open, apparently i can't ping ports so i need to use sockets, and it seems that there is no option for timeout on the connecting... how can i put a timeout on connect?
View 3 RepliesI'm trying to use a socket to connect a TCP stream. The socket connects no problem if the endpoint has a valid IP associated to it. If I give it an invalid one, the Connect method will sit and block (I want it to) for 10-20 seconds before telling me the remote host timed out. Is there a timeout property I can set so I don't have to wait that long for the connect method? Or is there another way of doing it that does implement a timeout?
View 3 RepliesI'm using sockets to connect to servers and for some strange reason I can't identify, the socket is taking several seconds (5 maybe 6) seconds to connect when using an IP whereas is instant when using a hostname. Here is my code to connect:[code...]
In the above code, server of course is a string. I've tested this with a friend and she's experiencing the same issue and I'd like to get around it as it's sort of annoying..While debugging GetHostEntry is the line that seems to take forever when using an IP.
I started to setup a Server and a Client for personal purpose. When I try to connect the Server by a computer inside a shared network, with local IPs, works but when I try to connect an external IP, doesn't work.[code]
View 3 RepliesI'm not sure if this is a VB.NET error or SQL Server. But I get the above error with following stack trace:
[SqlException (0x80131904): Timeout
expired. The timeout period elapsed
prior to completion of the operation
or the server is not responding.]
System.Data.SqlClient.SqlConnection.OnError(SqlException
[code]....
I have a vb10-form that makes connection with a SQL-db. The first time the SQL command is executed perfectly and the records are showed as they should. When I do a refresh (or automatic refresh after 1 min) I get: "Timeout expired. The timeout period elapsed prior to completion of the operation or the server is not responding" The strange thing is that this only happens on one PC, all the other work.
View 19 RepliesMy program needs to connect to a mysql db, but if the users has no internet or fails to connect i don't want my app to crash
View 4 RepliesI wrote a Socket Client which will send the Socket Server some data and get some response from Server. This process will be running once in every 2 seconds.
Now what I need to know is How we can identify the connection lost between Server and Client?
I need this to be implemented in the Client side. If there is no connection then Client should automatically close the connection. Once the connection with the server is available in the next attempt it should connect automatically.
I am working on uses the ThreadPool class and specifically the QueueUserWorkItem method to launch its background tasks. I am however having an issue related to SqlConnection timeouts. My error is this: "Timeout expired. The timeout period elapsed prior to obtaining a connection from the pool. This may have occurred because all pooled connections were in use and max pool size was reached."
This code is using all available ThreadPool threads because it is processing nearly 100,000 items, each on a threadpool thread, and updating an SQL database. So my question is this? Has anyone ran into a similar problem or could shed some light on a resolution to this issue? In testing, if I use the threadpool. setmaxthreads function and give it a value of 100 (to match the default Sql connection pooling count) then all runs just fine, but much to slow to process this much data.
[Code]
i can connect socket well but i want to ask how can i determine that socket has received data i want to create sub or function that handles socket.receive byte the code i have is
Dim byteData(100) As Byte
Dim size As Integer = soc.Receive(byteData) 'receiving the data from socket and reading its size
For i As Integer = 0 To size
Console.Write(Convert.ToChar(byteData(i))) 'Convert.ToChar will convert the byte value into character
Next
i want to start this code each time when socket receives something?
I am making a contact management program that works like a chat conversation. First, the client connects with his/her name and says: GIVE_INFO. Then, the server sends the client's info that it gets from a csv. Finally, when the user makes all desired changes, the client "tells" the server the info separated by commas and the server replaces the information in the old csv with the new info.So, the program worked for 2-3 times then all of a sudden when I made some changes it stopped working[code].......
View 2 RepliesI am successfuly connecting to an FTP server and have no problems with uploading / downloading files and initiating general file transfers. However, when attempting to list the directory I get a strange exception and it seemed to just start happening of its own accord.
Cannot access a disposed object. Object name: 'System.Net.Sockets.NetworkStream'. This is confusing! I am certainly not manually disposing any of the connection of stream reader objects, nor am I disposing anything else in this entire sub routine. On setting breakpoints, it seems that the array list is filled correctly but then the error fires when the status code is 226 despite me clearly specifying that the while loop should not run under these circumstances. (226 is equal to FtpStatusCode.ClosingData)
i'm creating an IRC server and I already have a few base classes complete like logging and Config. I was about to start with programming the socket class(es) when I realized that I have no idea how to make such a complicated socket system. I do not under any circumstance want to use any other code than my own since that would not help me learn sockets. I am familiar with a single connection socket system like most tutorials use.
[Code]...
I have codes which is written with python. I am not good with python and i want to convert this python codes to VB 2010.This python function searching local network and finding my LG TV's local IP adress. I want to find my TV's local IP with VB 2010.
[Code]...
I make a lot of programs that require an internet connection to download things from the web.At the very beginning, I used WebClient, as I didn't know Socket & how it worked.But now, I use Socket all the time, altough it's more lines of code. It seems to work faster then WebClient.I am interested if this is really true & why WebClient is slower (so is HttpWebRequest) then just a Socket.I've setup 2 threads which starts on the click of a button (WebClient thread starts first), the Socket beats the WebClient by just some milliseconds, but still.Each way has it's advantages & disadvantages, e.g.: if you use Socket, you need to write the header yourself & parse the response header.My question is, which one do you prefer & why ?Do you know why WebClient & HttpWebRequest are slower then Socket, as I assume, WebClient & HttpWebRequest both use tcp to download the things.
View 2 RepliesI've looked through a lot of snippets online and I see a lot of things similar to
Dim bytes(tcpClient.ReceiveBufferSize) As Byte
networkStream.Read(bytes, 0, CInt(tcpClient.ReceiveBufferSize))
but what I am unsure of when to call such a thing? How do I know when there is data to receive...in visual basic 6 with winsock, there was a specific routine which was called upon data arrival, but I see nothing of the sort for vbNet.
I am making a java chat server, and a guy was able to connect to it no problem (however, he logged off for the night before I ran into any problems, so I couldn't see what he did). Here is my code on the VB form:
[Code]....
Below is my code, but when i send the message thru client socket i receive Specified argument was out of the range of valid values. Parameter name: size
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim serverStream As NetworkStream = clientSocket.GetStream()
Dim outStream As Byte() = _
System.Text.Encoding.ASCII.GetBytes("0800822000000000000004000000000000000920092126012345001")
[CODE]...
I am working on a chat client and server, and so far it works well, but when I close the client, the server throws an exception because it continues to try to do processes on the disconnected client. I have tried adding clientSocket.Close() in various places throughout the client and server with no luck. Does someone know how to add the disconnect code to either the server or client with this code?Server:
Imports System.Net.Sockets
Imports System.Text
Module Module1
[code].....
it's just for a program registration. i would store all of the registration codes in the access database, then export it to XML, then upload it to my web host. I would then somehow connect it to my Visual Basics login form (Which I have already made). If this can't be done, having them register through the form and having all the allowed codes on the internet (So i can easily edit them)!
View 5 RepliesI was trying to establish a database connection to MS Access but this error keep occurring.
The 'Microsoft.Jet.OLEDB.12.0' provider is not registered on the local machine. I have forcefully set my cpu to x86 but still no lock below is the code how I open it.
Imports System
Imports System.Data
Imports System.Data.OleDb
[Code].....
I am building an application that updates a table in Sybase 12.5.3. Here is my situation.
How can I connect to Sybase 12.5.3 from vb.net 2010? In the past, I have used ODA to connect to Sybase and it worked fine.
The problem is that ODA was removed from VB.net in versions 2008 and 2010.
These Visual Basic versions are now using ASE to connect to Sybase but ASE is for Sybase 15.
I tried using ODBC but the drivers that come with VB.net are for Microsoft SQL.
I tried connecting to Sybase using MS SQL drivers. I was able to connect, but the execution did not work that well.
how to connect and how to execute a stored procedure with input and output parameters?
for example, if i want to create a program that that takes the result of the calculator ( i mean the default calc of the windows ), or the result of any program, and keep these results in my created vb program, or to manipulte these results, is it possible?
View 3 Repliesim a beginner in visual basic.
View 4 RepliesI dusted off VB.net, and now im trying to connect to a local FoxPro DB. Problem is, its not working. Ive been at this for about an hour or so, trying many misc things, but without any luck. [Code]. 'C:aaaCF21000.DBF' is not a valid path. Make sure that the path name is spelled correctly and that you are connected to the server on which the file resides. Suggestions? That path is 100% valid, I can copy/paste that and open up the Database without error. I also tried other code I found on the web, some of them I cant even get them to run.
View 5 RepliesI had an application wich connects to an oracle DB (built in VB 2008). Now..I am using VB 2010 and the oracle client is obsolete. Therefore I want to change my application to connect to an oracle DB the right way.
View 1 RepliesI'm trying to write a small app that will connect to our SQL database and run a small query.
However, my first stumbling block is the connection to SQL.
The SQL is on a server called RCSRV01, and RCSRV01 is the name of the SQL Server instance. The database is called NHD
This is my connection code...
[code...]
Trying to connect to my SQL database.Receiving this error:[code]No idea how to fix this, any ideas?
View 22 RepliesI want to create an application which generates random questions. So, initially, I have a form where I choose some options. They're all "Yes" or "No". According to my answers, I want my application to generate 10 random questions which are written in a Excel file.
It's like:
Option 1: Yes (Generate 3 questions / Excel file: Questions 1 to 6)
Option 2: No (Generate 2 questions / Excel file: Questions 7 to 14)
how to connect vb.net 2010 to ms access database to get the data and display it in vb.net application that I am doing right now. My project is that I am doing dictionary application with vb.net so every time i put new word in search box, I want the vb.net to get the definition from ms access and display it in the application.
View 1 Replies