Socket Async Send / Receive

Jan 5, 2012

I coded a small tcp server/client software implementing the async methods of the socket object. In order to keep track and control of the transfered data on both sides, I decided to wrap the bytes to be transfered into small 65 000 bytes packets, sent one after each other, in varying order.In most cases, it works perfectly, and it is impressively fast. However, when I want to transfer larger data than my usual requests, say like a dozen megabytes, crippling problems start to appear, out of shit.Effectively, it seems that somehow when executed without pauses, the server sends the packets too fast, or that the client receives it too slowly. However, if I put the SendAsync method's thread to sleep for like 100ms before sendingthe next packet, everything arrives without problem on the client.[code]

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Client Socket - Send Message Through Client Socket Receive Specified Argument Was Out Of Range Of Valid Values

Oct 15, 2011

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]...

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.NET Socket Send & Receive Not Matching?

Feb 29, 2012

I have these following lines to send bytes using socket

Dim server As New Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp)
Dim myIp As IPAddress = IPAddress.Parse("myIP")
Dim ip As New IPEndPoint(myIp, Int32.Parse("myPort"))

[Code]....

As in the code, I am supposed to retrieved "Halo". Instead I keep receiving sth like "[]".

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Socket Programming Send / Receive BitArray

Apr 18, 2011

I need to include in my application that can receive connections from a client( or two).I am thinking, that I would like to have the clients send a "TelegramID" so that I may now how to process the code.Following the "TelegramID" would be a structure that would need to be processed.So far, I can use a single client and send just plain text but need some direction for my end goals.

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Communications :: [2008] Socket Programming - Receive / Send?

Mar 6, 2009

I realize this is a broad question, but how do I recieve / send packets. I know what packets I need to send and what Im going to recieve, but I dont know how to send / recieve them.

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Communications :: Socket Behaviour - Created A Client That Can Send And Receive Data Via TCP Sockets

Aug 26, 2010

I have created a Client that can send and receive data via TCP sockets. The objects stored on the serverside are the *exact* same object used for the client. They use the same send and receive protocols.

Now, when i send a string from the server to the client , it does precisely what it should do. However when I send a string to the server.... I do receive the string as an equal length of NULL characters. I run the server and client locally.

Basicly what can influence the behaviour between two completely identical objects performing the exact same task? I wonder if there is some socketflag issue if the TCPlistener.accept function returns a completely different setup then the one I R used to.

(if it is of any interest, the send protocol is asynchronious)

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Cannot Receive More Than 1 Response With Async Sockets

Jun 16, 2009

I'm trying to setup an asynchronous client and I can send/receive one command and response, but when I try to send the second command, the command is sent (I verified by code inspection), but I am getting no response.

Heres the code, a majority of it is from the Microsoft example.

Option Explicit On
Imports System
Imports System.Net

[Code].....

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Use The Code From Microsoft For An Async Socket Connection?

Mar 26, 2010

I am trying to use the code from Microsoft for an Async Socket connection. It appears the listener runs in the main thread locking the GUI. I am new at both socket connections and multi-threading all at the same time. Having a hard time getting my mind wrapped around this all at once.

[Co0de]...

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VS 2008 Async Socket Connections - Clear Out No Longer Useful Sockets From The Server?

Dec 18, 2009

I have been developing an async socket connection server and client program. I have been testing it, and noticed that if I connect to the server from my client and then disconnect. Upon reconnecting I am on a different port(local IP still). This is fine, however when I go to send a message, and the server trys to update all the clients, it eventually hits clients that do not exist anymore. I get the SocketException 10054, and upon connecting/disconnecting enough, it no longer works at all. My question is how do I clear out these no longer useful sockets from the server? I am doing currentsocket.Shutdown(SocketShutDown.Both); and then a currentsocket.Close(); after that. When a user disconnects.

[Code]...

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Stuck On Socket Message Receive?

Feb 19, 2012

My client program gets stuck on NetworkStream.Read even though the server is reporting it's sending the message. The client and server are running on the same computer.Full server code (console application)

Imports System.Net.Sockets
Imports System.Text
Module Module1
Sub Main()

[Code]...

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Receive Data From Multicast LAN IP With Socket Connection?

Mar 24, 2012

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

[code]....

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.

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Receive Data Through A Socket Created In Another Process

Jul 29, 2009

I am trying to implement SMPP protocol in vb. I am sucessfull in send and receiving packets using sockets. Now I would like to decentralize the functions of my program. I want to implement two programs one for sending and another for receiving using a single socket. I want to receive data through the same socket that was created in another process(i.e., the first program).

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Socket.Receive Is Dropping The Last Byte Of Every Packet

Nov 11, 2010

I am having trouble with a socket client application written in vb.net using Visual Studio 2005. The client connects to a C language socket server that is running on OpenVMS. The problem that I have is that when the server sends a packet, the client does not receive the last byte (of every packet!). I can dump the packets on the network and the data is all there. My current solution is to keep my socket messages short (247 bytes) and send one extra byte past the end of my data.

I would like to include more information in my messages and I cannot find a way to make this work. If I knew 100% how long the packets will be on the network, I could work around this by including an extra byte in just the right places. However, I don't want to make any assumptions about the length of the packets.

Here is a sample of my client receive code:

Private Sub ReceiveMsg()
Dim nTotalBytes As Integer
Dim nNumBytes As Integer

[Code]....

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VS 2010 Handle Receive Data On A Socket?

Sep 3, 2010

I'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.

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Socket.Receive Method - Increasing The Length Of Variable

Nov 28, 2009

While using the Socket.Receive method to receive messages through network, you should define a variable as the buffer and you have to specify the length like this: Code: Dim _ReadBuffer As Byte() = New Byte(LENGTH) {} My question is: What is the bad thing about increasing the length of this variable even if the received messages are sometimes shorter? (i.e. if some body let it 10000).

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If The Packet Received Is Over A Certain Size, The Socket Then Fails To Receive Anymore Packets/data After It?

Jul 4, 2011

I'm writing a program which uses sockets, Now the issue I'm having is, If the packet received is over a certain size, the socket then fails to receive anymore packets/data after it.

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Send Data With Socket?

Feb 21, 2011

I want to connect with a barcode printer and sendhim some specific characters and take back anything they send to me

[code]...

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Send File With Windows Socket?

Jan 10, 2010

I`ve been reading alot of tutorials on hwo to do this but i can never get it to work. I have a file named Book1, and I want to move it and call it "Book2".

There are .xls (Excell spreadsheet). Something is wrong with reciver when I open Book2 It says "System.Byte[]"

The test file "Book1" Has "Dog, Cat, Cow," In A1 A2 A3.

I think my byte conversion isn't working.

A tutorial said to use "Encoding.ascii.getstring(byte)" but Encoding is not delaired.

Imports System.Net.Sockets ' Allows us to make and listen to connections from another user
Imports System.Threading ' Multi Threading

[Code].....

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Receive And Send Packets?

Jul 25, 2009

Since a few months I want to learn how to receive and send packets. Since WinSock doesn't work I think it'll be quite hard to get an easy way to do it.

I want to be able to send and get packets as a client. (TCP) I know that I need System.Net.Sockets, and that's quite everything...

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Send And Receive Params?

Jan 11, 2009

I was going over the Screen Saver Tutorial for VB Express 2005 and i Noticed How the Screen Saver app excepts params at startup... and depending on the startup param it will display the screen saver or the options form... lets say that i want to start up a screen saver from my program, how would i send it to the screen saver to display the options form the param is "/p" or something.

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Send And Receive Pictures?

Mar 11, 2010

I have a program that is meant to send and receive pictures. There are two parts, client and server, the server sending pictures, and client receiving.the server needs to send it across the internet, then the client needs to receive and show the image in a picture box.

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Send N Receive Sms Via GSM Mobile?

Jun 18, 2009

how i send and recive sms through GSM like mobils using the AT command. vb.net have any api or control for it

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.net - Send And Receive A Large Image Using Tcp?

Dec 19, 2010

I need to send and receive a large image between programs running on different machines within the same network.

I've looked at using upd however ran into problems with the size of the packets and
(after breaking the image into smaller pieces to get past this problem) the number of packets needing to be processed all at once - and ultimately packet loss.

I've also thought of sending the image by storing it in a common file folder and receiving it by using file watcher as a trigger. However, this just adds further complexities in setup where common folders don't already exist.

Assuming I'm barking up the right tree looking at tcp, can someone point me to/provide an example of how to send an image file using it (vb.net would be ideal). Also, are there practical limits to tcp package sizes?

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Asynchronous To Send/receive From A Website?

Jan 24, 2011

I'm using asynchronous to send/receive from a website I want to block the BeginGetRequestStream method which I have done, using

Code:
WaitEvent.WaitOne(1000 * 20, false);

the problem is that it blocks the UI, which I thought it did not so it basically works like GetRequestStream which does block the UI.

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Create A Program To Send And Receive Sms?

Apr 12, 2008

Do you know how to create a program to send and receive sms and call from PC from and or to any devices?

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Error Tcp Send Receive Application

Jun 2, 2011

I have created an application which listens for strings being sent to my pc from a remote unit. I now need to add the function of sending strings back to the remote unit on a button press. I've searched for ages to find a solution but I'm not knowledgeable enough yet with vb.net to solve this solution.

I'm getting the error with the line opensock2 = New IO.StreamWriter(client.GetStream) saying its not connected. So I seem to need to pass the connection from the background worker to the button click, or have it somewhere else in the code to make it accessible. [Code]

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How To Receive N Send Sms W/o Human Interaction

May 30, 2009

as above how to do that man? I will also want to extract the information to be sent from the database. An example of what i am going to do is something like this:

Reference:[URL]..

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See How Much Bytes Did An Application Receive And Send

Mar 14, 2010

I didn't found any performance counter that would monitor an process's/thread's network bandwidth and not just that of an ethernet card.

So I could see how much bytes did an application receive and send.

Did I miss something or is there another way?

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Send / Receive Image Via Sockets

Feb 21, 2011

I want to send image from server to client via .net Sockets and assign it to a picturebox. but I got problem in receiving data, it's 'Server' side code:

[Code]...

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Send And Receive An Xml String Asynchronously?

Oct 23, 2010

[code]...

Now i need to do a few hundred/thousand requests all at the same time or atleast over a short period. I am assuning i need to do this asynchronously. I have looked all over the net and tested various ways to communicate asynchronously and am pretty stumped. None of the examples out there seem to explain how i receive the xml return as a string ("which i will write to file or db")

Does anyone have any working code to do such a process?

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