Broadcast A Message To Applications Through The Network?
Apr 29, 2009
I have a program running in many machines in a network. The program reads a Sql database, and there's a table showing one table in a DataGridView in each computer from the same DB stored on the server. The same table in all the computers. What I want to do is, every time one computer changes something in the table, to update every table in all the computers.
Every program writes an entry in the database to know that they are connected to the DB. So any program can know who the other computers are.
How can all the computers know that there was a change in the table? (the idea is the get the changes quickly)
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Nov 1, 2009
I have some experience creating programs that use tcp to transport information from a server computer to a client computer and vise versa. However, I am unable to create udp server/client programs with visual basic.net . My goal is to be able to set up a connection with several computers that can communicate with eachother.Kevin Schaefer "The world is round and the place which may seem like the end may also be the beginning"
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Aug 18, 2009
Here is my idea so far: I have a bunch of computers connected in a local network. One of them is a MySQL server, one will have a vb.NET program wich will act as a "second server" and the rest will be different clients. What I want to do is that the "second server" will send out some kind of message or network package to some of the clients in the network, and they will execute a code based on what message it is, or what kind of package it is. I'll give you a simple example:
[Code]...
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Sep 7, 2009
I have seen that unsigned .net applications will not run on most college networks and as part of a school applications i am trying to let these applications run on a protected network. The app is written in VB 2008 and is signed strongly.
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Nov 2, 2009
I need to assign code to a button, that when clicked on, validates an ISBN code, and displays a message that it is either Valid or Invalid. I basically need help transforming code used in a console application that will now be used in a windows form application, so no more writeline stuff, now message boxes. [code]
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Oct 20, 2010
to do a program that can send a message in other computerthru LaN or Computer NetworkExample im in Server and i will send it is \PC-01here is the picture i design it but i don't know the code
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Nov 2, 2009
I have this codes here whereby my objective is to develop a writing network applications of programming, a means of sending data to a message board(messaging system). My problem is I couldn't connect it to the server's IP address and port num to send a data through a message board. However I could only display at Form2 txtReceive.
Text = HexConvert.Data_Asc_Hex(sData),
Whereby this code could only convert whatever data(txtSend) that is being typed in, could then convert hex decimal into a textbox(txtReceive). The final result that I would want to achieve is to be able to display the at the textbox(txtReceive) is the <"message protocol"> & <"hex message that is being typed"> & <"parity bit"> into the txtReceive box.
Form form 1, my codes are....
Imports System.Net.Sockets
Imports System.IO
Public Class Form1
Const portNo As Integer = 1234
Dim client As TcpClient
[Code] .....
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Jul 19, 2009
I'm writing an app that sends messages over a network to another PC that processes the message and sends back a reply (e.g. a boolean or some other data). My network communication subs (based on WCF) just give me the ability to send a message to the other PC and process any received messages.The issue is that any response received is processed by my designated network message event handler sub, but I have no way of feeding it back to the sub that called for the original message to be sent.
[Code]...
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Jun 11, 2011
how to send a message to another computer in my companys network using visual studio 2008...I would like to be able to list all the computer names on the network and select certain ones and send them a message that would pop up on their screen
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Jul 16, 2011
I was wondering if there was a method of broadcasting an file over LAN, my reason for asking is because I am trying to make a LAN file sharing program, so that I can share files over the network easily.
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Oct 24, 2009
Alright im trying to make on application broadcast a message(Hello<Split>Whats Sup?<Split2>O.o HI).How would i make my reader application read that and put Hello one text box Whats Sup? in textbox2 and O.o HI in textbox3.
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May 18, 2010
I have developed a chat application using wcf duplex, use for WAN networkIn my list chatting, have max 1000 clients online currently.Now i want to send a message to all at once. So i dont know how to do it, how to send broadcast ?
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Apr 23, 2011
i have made media player for my own i need code that broadcast video over Lan network "clintes/server "as fast as can.
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Jun 1, 2011
Dear experts. i want to change "hide Extension for known Fils type" and then Refresh Explorer for effects this change. Change Hide File Extension Code:
[Code]...
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Jun 2, 2011
I find out a solution that can change registry and Broad cast changes to Desktop and Windows Explorer.
Code for Change Show/Hide Files Extension[code]...
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Mar 11, 2009
I'm broadcasting a simple message to ..*.255 (changing to 255 the last part of my ip) and i'm trying to listen to it. the code returns no error but i'm not receiving anything. In wireshark I can see the broacast is sent correctly, but with a different port each time (I don't know if that's a big deal).
Here's some parts of my code.
Private Sub connect()
setip()
btnsend.Enabled = True
btndisconnect.Enabled = True
btnconnect.Enabled = False
receive()
[Code] .....
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Jul 23, 2010
I want to be able to kinda like have a timer that will get an image off my Hard Drive, and upload it online, so that all I'd have to do is download the image, even if it's been written over, I want to be able to broadcast an image from my hard drive, using only my IP Address.
127.0.0.1 is my IP Address.8888 is the port.Somthing like if you were to goto http://127.0.0.1:8888/update.html or Update.Jpg If YOU were to go to this address on your machine, you could see the image... Of coarse, it will probably be an image of which I was able to get from Printing my Screen image, and then saving it as like C:Test.Jpg, but the Timer would get my Desktop Image, or Print My Screen and Save it and Overwrite the Test.jpg image on the C Drive... Ya know what I'm talking about?
[Code]...
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Sep 12, 2011
I am working on a project that is used for key broadcasting. Don't worry nothing illegal, I'm making a multibox application for world of warcraft. However I am having trouble when it comes to launching and manipulating other applications from another.
[Code]...
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Jan 1, 2010
Suppose I want to broadcast CTRL+C to my program without using complicated code (accessing Windows API) to do it.
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Nov 18, 2011
I have a .NET 2.0 *.dll that calls My.Computer.Network.Ping(). The *.dll is then run out of an *.exe via AppDomain.CreateDomain() and Invoke(). The problem is that this works just fine under Windows XP but under Windows 7, I get an exception saying that no network connection is available. I tried the Ping() call out of a small console application under Windows 7 and it works just fine.
[Code]....
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Aug 15, 2011
how to connect different vb applications to a database server.like accessing data from one database by different applications...
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May 13, 2011
i have 2 application clinet/server the server broadcast media files to client i used tcp/ip protocol the server code is work good but i have a problem in client code i need ineed someone to correct the code .iwll show where the error is in the code note: i call the class in the main form dim a as recive in the starter of the main form class to be gloable .
[Code]...
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Feb 25, 2010
How would i broadcast/specific(one person) a live voice over a tcp connection for my voice chat room im making.
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Apr 20, 2009
How to make a picturebox display "broadcast" from webcam, I want to take a picture and then save this. I've read lots of different proposals, however they are in VB6 or C# or any other but Visual Basic 2005
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Jul 24, 2009
Is there a way to, when a parent application is opened up, that at the click of a button, or anything of designated event, that this parent application can open a secondary one?
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Mar 26, 2012
I am writing some code as part of a framework for opening a file.The file is of custom type and should not be opened by more than one instance of my application. To stop multiple file opening I use a filestream to create a lock file and then keep said filestream open. This seems to work in preventing another instance of my application from opening the file ( as it will fail in recreating the lock stream in the files open code ) but if the file is on a network share and the network drops then the original application also can not access the file any more.The code to get the lock stream is as follows:
Try
' We need to keep this stream alive to prevent other applications gaining access to the lock
mLockStream = New FileStream(mLockPath, FileMode.CreateNew, FileAccess.Write, FileShare.None)[code]....
In this I create the lock stream the first time round and then if another application tries to create it, it throws an exception and stops them from getting any further. This is kind of how it needs to work, unfortunately as I said, if this is done across a network and then the network connection is dropped for some reason then I can not delete the lock stream as I get an IOException telling me a process cannot access the file as it is open in another process ( which shouldn't be happening I don't think).
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Jan 6, 2010
create a message box that stores my user name, message, and post datetime into the database as messages are sent. Soon came to realise, what if the user changed his name? So I decided to use the user id (icn) to identify the message poster instead. However, my chunk of codes keep giving me the same error. Says that there are no rows in the dataset.
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
Dim name As String
Dim icn As String
Dim message As String
[code]....
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Feb 22, 2009
how to create an error message by message box to tell the user to enter a number only if they key in a character value?
I MEAN AFTER THEY PRESS THE CALCULATE BUTTON
Private Sub btnCalcFat_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnCalcFat.Click
Dim intFat As Integer
intFat = Integer.Parse(txtFat.Text)
lblResultDisplay.Text = txtFat.Text * 9
End Sub
My text box is call txtFat
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Dec 13, 2010
just curious if there was a way to make the text in a message box scroll across the message box
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Jun 22, 2011
I have a problem I want to make a server and client where the server is password protected and will make the client display files/folders in a designated folder which will be in the server's current directory and the client will ask what IP and password to connect to and if the password is correct is allows the client to access the files/folders in that folder in C.D. of the server and the client can download any file within the folder by clicking a button, yet don't even know where to start.
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