VB 2005 - Socket Send Only Few Peaces Of Data And Loose A Big Part Of It
Nov 25, 2009
i'm developing a server application using vb.net and i'm facing a problem. in fact i have a huge data to send to the client via the socket so i use a loop to divide the data and send each part the problem is that when i proceed with the sending the socket send me only few peaces of the data and loose a big part of it. i tried to flush the buffer after each sending but i didn't find how to do it so i used a system.threading. thread sleep between each socket send. it works when i don't have huge data but it blocks my server when the number of packets increases. is there a solution that would replace the. sleep one without blocking the application?
I am trying to communicate with an external device and i am trying to send a byte array to the external device via sockets but i am always getting a response the message size is too small so i am not sure what i have done wrong. Between the data type there should be no alignment present and all numbers are represented in little endian format. The char array is not null terminated as mentioned in the protocol specifications.I have to send data based on a struct that embeds 2 other struct. So here's my vb.net code for the struct used to convert to byte array and the sending part.[code]
I have been working on an ongoing project using socket communication.
I am using this code [URL]
The problem I am having is I am unable to figure out how to call the send sub and insert data into it. I have been able to do it before by removing the second class out and leaving it in the main class (if that makes any sense).
Imports System Imports System.Net Imports System.Net.Sockets
[CODE]...
These are the small modifications I have made to it so far. What I am trying to do is when I press a button, it calls a sub routine that takes the text input from a field and sends it to the send sub routine in this code.
I'm attempting to discard the contents of a System.Net.Sockets.Socket send buffer using theSocket.IOControl(IOControlCode.Flush, .... Does anybody know whether VB.NET supports this command? I've tried supplying 'Nothing' and 'Nothing' for both required parameters, also empty and populated byte arrays in combination with 'Nothing' for both required parameters, but I consistently get an 'Invalid argument' exception. I've tried a web search for an answer, but the only mention I've found was a question asked about 8 years ago, with still no answer.
I am facing problem in asynchronous socket communication.
1)I wanted to perform connect(from client to server) operation on enter button and send the data whatever client want to send and disconnect from server. And again client should get connect to server whenever client wanted to send data. this is the mechanism.
i.e how to reuse the socket.
2)Again Server should able to send the data to client.
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)
I am trying to create a socket class in my project to send data to ecr (electronic cash register).Ecr comes with software that listens for commands on port 3535. Command are in forms of XML Files. It has only one catch, I must close the connection on socket, so the ecr would know when to process the command and respond. Since I only send one command at a time,I need the simplest solution I can get.
How it works:I create the socket and connect it to 192.168.1.67:3535 I start
client.BeginReceive
Then I send the command with
client.BeginSend
And I do a
client.Disconnect(True)
so I can get response from ECR.And in 8 of 10 times it works just fine. The problem is this few times it doesn't work.At that time I cant receive anything because it reports that the client is not connected in ReceiveCallback but it still manages to send the data to ECR just fine. The bill comes out on the ECR, but I get no answer about what happened.
I call the class like this:
Dim dre As New HCPSocket Result2 = dre.Otkucaj(Command1, "192.168.1.67") Debug.Print(Result2) dre = Nothing
End the class looks like this:
Imports System Imports System.Net Imports System.Net.Sockets
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")
The form is like this:A database contains six columns:"From Bank","From Account","From Balance","To Bank","To Account","To Balance"On transfer button click,The balanced will be transfered and added to the "To Balance" of "To Account"i did the code for form load but i cant get throught the transfer money
Imports System.Data Imports System.Data.OleDb Public Class Form1
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 "[]".
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
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]
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.
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.
I have a problem reading data from an RFID-reader. I connect to the reader by tcp and wait for DataAvailable to be true, then reading the data until I got a end of data character. Then I just go back and waiting for a new DataAvailable. This is done in a own thread for the function.
There seems to be some kind of timeout, If I don't got any data in a couple of minutes, then it just sits there in the do/loop waiting for DataAvailable. I hold the card to the RFID reader, it beeps, but there is no data available. I don't get any exeptions, and the information says that the clientsocket is still connected. Are there anything more I can check?
If I put the card to the reader in a minute-interval it seems as this will never occur. So 2-3 minutes idle:ing seems to do this.
Here are my code to read data from the socket, I have taken away some irrelevant code:
Sub test(ByVal ip As String, ByVal port As Integer) ' this sub is meant to run forever
OK I was a little hasty in marking my earlier thread resolved... I'm sending a file from my server using the following code :
[Code]...
The received file (in my test case it is a PNG file) comes through corrupted - I'm 99.99% sure its a case of encoding but I've tried various options and in each case when I open the original file and the received file in notepad the files are visibly of the same origin but some characters are wrong in the received file. I'm sure its a simple answer but I can't find it - what am I doing wrong in terms of re-assembling the received file?
I have found a simple UDP project at [URL] which is a project written in VB2003. I have imported it into VB2008 Express edition. I have no problems with the send part of the project. I'm able to send messages to internal (eg. 127.000.000.001) and external (in my case the other device has 192.168.0.100) addresses. Now for the receive part... I'm able to receive messagess sent form the same computer (127.000.000.001) but none of the packets are being received by the aplication if sent from an external source.
I Have a RTF File which i have exported from CrystalReportviewer Now i want to assign the exported RTF to a RichTextBox[code]..
The File is Loaded successfully.. But i m loosing the Formatting , i mean to say When i m opening the Same RTF Outside of the application its Showing the Format As it was in Report ... But While i m Attaching it to Application It looses all the formatting .
I was playing with vb 2008 express and i created a function with no return type. Basically what it does is i specify a table name and a column name and it returns the value within but it doesn't type it until it gets to the calling variables type. So i have on function that i can use across all my tables.
Eg: dim mydate as date = getvalue("tblSRs", "datelogged") msgbox (mydate) dim desc as String = getvalue("tblSRs", "description") msgbox(desc)
Both return the correct values. were you always able to leave the typecasting till the end and whats the major downfall?
I'm working on a simple socket client application that transfers files from one PC to another. The flow is as follows.
Client sends message to Server Client Listens for response Server responds with command Client sends file or message to Server Client Listens for response
This sequence will repeat thousands if not tens of thousands of times. It runs great on my dev box but when I load it on another machine I get a StackOverFlowException. I know why I'm getting the stack overflow. It's because I have a Listen subroutine that calls a Send routine. When the Send routine is done it calls the Listen routine again. The process works for about 614 iterations and then bombs out with a stack overflow. I guess my question is, how can I code a socket application that can send-->listen-->send-->listen thousands of times without blowing the stack?
I am reading data from a socket (as bytes) and storing this data in a string. Then later i need to access specific bytes within the string and do some math with them. However the bytes that I read back from the string are not what I am expecting.
i am a newbie in socket programming and remoting.May i know where lies the difference between the socket programming and remoting? Where do i start off to learn the basics of the socket programming?I haad a goo with the google search but unfortunately the search outcome results are a bit tough for me to understand
I just converted the following code from c# to vb.net. It is functional and works correctly with my company's firmware/devices. My next challenge. Previous serialport code used much more readable structs which where then converted (after building a packet) into byte() automatically as part of the serialport encoding. (this is my understanding)How could I
1. morph byte arrays 'ToSocket' and 'ToMTP' below into structs and
2. convert into byte array for Socket.BeginSend(byte(),.....) to stream out to remote devices?
I would like to make a multi-socket TCP server (to accept multiple clients at the same time).I'm working with Visual Studio 2005 Express, maybe that's why files on CodeBank don't work..I found on the web an example about MultiThreaded Server Socket programming, but this is done for "Console application" in this way:
I 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'm looking for a way to cut out unneeded text from a string. The remains of the string should be "Result: Sucesfull".
Example strings:
[Download Report] 26 october 2009 Result: Succesfull
[Code]....
As you can see the string in my first example contains 3 lines, and the second example contains 5 lines. In my application they differ depending on the situation. I want to cut out all lines, except for the line starting with 'Result:', which I want to display to the user of the application.
i am working on 3rd party chat software, when ever i send data to server i get incorrect buffersize of data. like when i convert that data to hex to matching header for splitting data i got huge lengths data
in the above textbox of image i have got some 0000000000000000000.... with the hex data, how can i get only only original data. The code i have used to receive data is
I have posted about receiving email before and this is a follow up of my progress. I have only one form and it consists of 2 buttons, one for downloading messages from the server, the other, to disconnect the connection. I also have one listview and one textbox to display the message. I took the codes from a few open source programming website and compiled them. My program works as such that upon clicking the 'Download Messages' button, a message box will pop up and the user/admin will be asked to enter the POP3 account name. My doubts are I am not sure what POP3 account name to put in.
i m inserting time from listview into sql database 2005.....but it results inserting both date and time part as well..but i want to insert only the time part.
