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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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)
UDP multicast client and server chat application.
View 10 Repliesfrom the documentation we have this: Multicast Delegate: Represents a multicast delegate; that is, a delegate that can have more than one element in its invocation list.
so am i right to say that Multicast delegate is no different from a normal delegate other than the fact that it has arguments. so System.Action is a 'normal' delegate whereas System.Action(T)(Byval obj as T) is a multicast delegate?
I want to build an application which will multicasting over the internet. I already have same solution for the LAN environment (UDP).
View 1 RepliesI've put together a multicast client/server application in VB.Net using VS 2008. I can run the server on either Windows XP or Windows 7 just fine. The client runs fine on Windows 7, but throws an exception on the line that adds membership to the multicast group (line number 9, including the subroutine definition). [code]
View 2 RepliesIm needing to create a 2 applications that can talk to each other. One wil run on a server as the server application and others will run on workstations as clients. I want them to connect to the server app much like a chat program would work. I want to be able to send commands from the server to the workstations such as reboot, open this file, things like that. I also would like to be able to send the commands backwards to the server if needed as well. i think a chat program could be modified to do this by "watching" the message and if the word "reboot" comes through then the server/workstation would convert that to a command.
View 9 Repliesi wanna know whether we can create mobile applications for nokia (N series) and install them in the phone using vb.net..i have gone through the smart Device option available in .net and it seems to be valid only for pocket PC's.
View 1 RepliesI am working in Windows applications. I want to create a Chart for showing results as user friendly. How to create chart in VB.NET or C#.NET for Windows Applications.
View 3 Replieswhich method is more efficient to use: DataAdapter and DataSet Or DataReader when importing data from a certain database table???
View 6 RepliesI my opinion i think i should use datasets fully when performing select, insert, update and delete operations to DB. Foloowing this concept, The applications control flow should be:
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I am trying to use MessageQueues to notify users of an application of data changes using the Multicast feature, but can't get it to work : the workstation that sends the message does receive it, but none of the other running workstations seem to catch the sent message.Sending messages is done as follows :
Dim sendQueue As New Messaging.MessageQueue("FormatName:MULTICAST=234.1.1.1:8001")
Dim message As New Messaging.Message("message body...")
sendQueue.Send(message)
And receiving them :
Dim receiveQueue As New Messaging.MessageQueue(".private$myQ")
receiveQueue.MulticastAddress = "234.1.1.1:8001"
receiveQueue.BeginReceive()
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So I'm obviously missing something, and I can't seem to find any good ressources on multicasting with MSMQ 3.0 in .NET.Also, what is not clear is wether I should use a local queue per workstation, or one single remote queue on a server to multicast messages ? And does using the receive method on multicast messages purge them from the queue ?On a side note, all workstations are on the same subnet, and all have MSMQ 3.0 installed.
Despite what the Queue properties dialog says, permissions are NOT totally ignored on unauthenticated queues, at least when using multicasting. If you want your queue to receive multicast messages, it must give to 'ANONYMOUS_LOGON' the right to 'Send messages'. Otherwise, multicast messages are just discarded without any notice in event logs or whatsoever (unless I missed something).
On Win7 stations (XP stations seem to do fine, which is what pointed me to the actual problem), queues created through code do not have such permissions, and hence must be manually set after creating the queue :
Dim msgQ = Messaging.MessageQueue.Create(queueName)
msgQ.SetPermissions("ANONYMOUS LOGON",
Messaging.MessageQueueAccessRights.WriteMessage)
It would seem that internally, MSMQ uses that account to write multicast messages to unauthenticated queues.
I converted some codes from python to VB 2010. My aim is sending query data to multicast IP and get the response. My query data receiving from device which is connected to my LAN. Also the device responding my query and my PC receiving the responce but at this point the VB program freezing.getting response data and printing to console without freezing.
This is the code list;
Imports System.Net
Imports System.Net.Sockets
Imports System.Text
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Here is the Wire Shark (Network Protocol Anlyzer) screen shots; My computer IP is : 192.168.0.11 and device's IP is : 192.168.0.10.
I am very familiar with VBA and have been using access and excel to create applications that connect using ADO and/or linked tables.I'm looking to start developing simple Windows applications for my company using Visual Basic, that will connect to Oracle and SQL Server Databases using ADO. What do I need to accomplish this? If I purchase Visual Studio 2008 Pro, will it come with VB? And do I need anything in addition to this in order to connect to SQL or Oracle databases using ADO method?
View 7 RepliesI am using VB 2008 Express Edition and I need to create applications using the Smart Device template and the ASP.NET Web Site template.
View 1 RepliesUsing: Visual Studio 2005.We are developing three different applications. We currently have 4 different modules that we all share among our applications. When a change is made to one of the modules, we must make changes to the other two modules.If it is possible, how do you (where do you) create a single location for one file to be shared among three different applications? Hopefully this will avoid the unnecessay task of changing a file three times.
View 3 RepliesI 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.
View 5 RepliesAlright 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.
View 2 RepliesI 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 ?
View 2 RepliesIm trying create a small payroll system using VB.Net windows form applications. The problem im currently facing is when im updating the datagridview. But my update doesnt work. IM using dataset and databinding source. I want to udpate the datagrid view and automatically update the database. [code]
View 1 Repliesi have made media player for my own i need code that broadcast video over Lan network "clintes/server "as fast as can.
View 1 RepliesDear experts. i want to change "hide Extension for known Fils type" and then Refresh Explorer for effects this change. Change Hide File Extension Code:
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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]...
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()
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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?
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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.
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Suppose I want to broadcast CTRL+C to my program without using complicated code (accessing Windows API) to do it.
View 3 Replieshow to connect different vb applications to a database server.like accessing data from one database by different applications...
View 4 Repliesi 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 .
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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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