Communications :: What Does <MTAThread> Actually Do
Jun 17, 2010
I see it often declared in front of main functions and after reading the MSDN comment on the matter, it's purpose still eludes me. As far as i can understand it has to do with setting the program into some form of multithreaded state. But what does that even mean?When should I use it, why should I use it, is it even currently relevant becouse i read somewhere that the default apartment state is MTA nowaday's What's it's purpose mister Anderson ...
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Jan 26, 2009
I am using VB2008 Express and am curious how to send a command via RS232 communications. The string that I need to send is 02h PON 03h. The start and end bits are 02h and 03h.
How can I convert 02h and 03h to its ascii form. In hyperterminal, I use the sequence {(hold)ALT 0 0 2} on the number pad to send the start bit.
I am using this code currently without the start and end bits
Code:
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Jul 21, 2011
I got a piece of code that I have to use as a class. It gets added to the project every time, the accessed from the code of the forms.
It is for ethernet communication to an industrial radio.
So right now it's a just a class called MK
Question:
Is it possible to compile a class into a DLL which then can be just referenced to each application?
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Jul 1, 2010
How can I target a Adapter I have on the machine and Tell through windows API if its a Wireless or Hardwired Ethernet Adapter? I really want to avoid doing anything real High level like piping Command prompt text XD.
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Mar 4, 2010
I am writing a utility and using the ftpwebrequest. I am wanting to add a progress indicator to help the user know about how much time is left on the upload.
Code:
Private Sub UploadFTPFile()
Const filePath As String = "C:"
Const fileToUpload As String = "1.txt"
Const ftpServer As String = "ftp://xx.xx.xx.xx"
[code].....
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Mar 29, 2012
I didn't make this code but can someone explain to me how to add more than one client to communicate to add to this code?e.g 3 people to talk or is it not possible?
[Code]...
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Dec 6, 2006
[code]...
The &H30D? i know its a hexadecimal value and may represent a message but i cant find anything about why someone would need to use one, and not just "As Integer = 703". I've found nothing in the VB.NET library or windows messages/functions docs.
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Dec 27, 2008
I am trying to build an IM program i found one (see attachment) but it is network only and i want to build one that goes over the internet?
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Mar 24, 2012
Can WCF be used communicate through the internet? All the examples I have found show it being used on a local network.
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Apr 14, 2011
Is it possible to read out the contents of a page that has already be loaded into a webbrowser...say IExplorer...? On 'normal' windows programs there is a way to externally control a program and its contents. But on a page loaded in a webbrowser i can't find a way to get external control of its contents and buttons ect..
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Jun 28, 2010
I am sending data to some microchips with a serial port control using:
Code:
well, it work up to the value 9, but anything with more that one decimal place sends a byte value of the rightmost digit. So, 16 in the text box will send 6. Basically, it appears to be sending just 6, or 1 followed by 6. Is this how the serial port sends data...one digital at a time? Or, is the conversion to a byte failing?
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Aug 5, 2009
Is there any easy way to determine the IP address for the computer that an app is running on. I looked through the System.Net namespace and didn't see anything of the sort.
Basically, I want to display the IP address to the user, instead of walking them through how to do an "ipconfig". They then can put that IP address into another app, so the one app can talk to the other via UDP.
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May 26, 2009
I am trying to make a cnc program i have learnt a little about g-code i want to know how i can generate g-code from an image? Also how i can use this g-code in my program in vb to move motors?
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Aug 21, 2008
Code:
Private Function web_scan(ByVal code As String) As String
Dim myReg As Net.HttpWebRequest = _
DirectCast(Net.WebRequest.Create(ServerSelect.Text & "/scanner.php?code=" & code), _
[Code]....
I need to give a variable to php file via GET and recive responce. HttpWebResponse dosen't work on my PocketPC so I need n alternative.
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Jan 24, 2010
I have this code to connect to my server:
client = New TcpClient(txtIP.Text, txtPort.Text)
client.GetStream.BeginRead(readBuffer, 0, BYTES_TO_READ, AddressOf DoRead, Nothing)
SendMessage("/CONNECT|" & Label25.Text)
[code].....
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Aug 22, 2011
I simply want to be able to delete a file via ftp. What irritates me is, it is so easy to upload a file but so much harder to delete a file.
way to delete a file over FTP using visual basic
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Aug 6, 2008
I would like to turn of this exception in the debug menu but I am not sure how or which one to uncheck or check.."ObjectDisposedException was unhandled"
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Jun 11, 2009
I'm trying to upload a file via an IP address using the System.Network.UploadFile method. I have the IP address like this:xxx.xxx.x.x
At runtime, it says that it isn't a valid remote address because a valid address should include a protocol, a path and a file name.
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Jul 11, 2011
I am trying to make a simple port scanner to scan a rang of IP's so like 192.168.4.245 to 192.168.5.100. I am using Visual Basic.Net 2010 and am having trouble converting the IP from a String to a Long so that I can increment it and convert it back to a String. For some reason VB.Net 2010 doesn't include the winsock controller and therefore I am having problems finding a method that works similar to inet_addr() which makes conversion much easier. I found an example on one of the forms here
Code:
Private Sub Command1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Command1.Click
[code]....
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Dec 4, 2010
New connections will be remembered. [code] keeps saying that it does not exist, and yes TextBox1.text = "winxp-base02".It clearly shows in CMD with net use that the connection does exist, anyone know Why I can't kill IPC$ or from what you see should work?
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Mar 8, 2010
For many years, I have sent data between 2 computers using serial ports."Here is the data", "Thank you for that data!" type stuff.Where do I get more information for doing the same thing with 2 computers that are networked together? Assume a local ethernet connection.I have experimented with serial-ethernet modems and that works well but I don't want any more hardware.Is there a good thread here I should read?I want 2 VB programs running and I want to exchange data periodically.
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May 27, 2010
For my next project i'll have to create a TCP or UDP server based application. I know how to program a server but i am interested on the limitations of such servers.
how many connections a server may be able to handle at the same time. I suspect that this limitation is based on the type of transfer and how much data or how often it is send to the server.
I also read somewhere that a windows program is limited to 25 threads (connections) per core so if i would have a quad core i can have a maximum of 99 connections granted that the server itself is also a thread. Is that correct?
If the above is correct i wonder how to handle let's say 200 users at the same time. There must be some form / way to handle bigger request loads.
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Jun 3, 2008
We have a server in the building that we can poll for barometric pressure using TCP. Another developer uses LabVIEW to do this, so it may be a little more straightforward for him.
Here are the instructions:[CODE...]
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Feb 26, 2009
i am working with a printer connected to port1 this is not like regular printer.it is like a current bill generator printer.when we type data directly it has to print on paper
Mscomm1.Output = txtMessage.Text & vbCr
the code is working the problem is iam not able to set the fonts?
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Nov 24, 2010
for a test project that i'm doing i am looking for ways to program a LED screen. I ordered a few LED screens (320x160) that can be connected together). Using a special controlcard the whole thing can then display text etc. Using the software that a Chinese supplier gave me. All the above works fine. But I am depending on the software I have. I have VB.Net experience and I would like to put the software aside and write my own software. I would like to set up the COM connection and tell what LED to activate.
Problem i'm facing is that the chinese cannot provide me good use of the software dll files. I need a small Vb.net program that does the above. Would somebody be able to figure out how to do this.
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Jul 31, 2010
How can i record voice directly from mic
so i want to have a record button when the user clicks it the system will start recording from the mic. and once the user finish recording then save it in a mp3 format file
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Jul 24, 2008
I'm trying to send an image over TCP... I believe I'm sending the image correctly, but how do I receive the image?
Here's my code in sending the image (To shorten the code, I didn't show how the image is created).
Code:
Dim tmpImage As System.Drawing.Bitmap
'client is the connected Net.Sockets.TcpClient
tmpImage.Save(client.GetStream(), System.Drawing.Imaging.ImageFormat.Bmp)
[Code]......
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Aug 7, 2009
Using the Socket raw, with XP I can read without problems both the incoming packets and the outgoing packets. With Vista (I have tried also others Sniffers) is impossible to see the outgoing packets...WHY? what I have to do to see alse the outgoing packets? In reality I have not to read packet data or packet lenght... I need only to count the number of incoming packets and outgoing packets... but with Vista this job seems impossible... or not?
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Jan 16, 2010
I'm having a hard time getting the fundamentals down about these TCP Socket classes.
When you use TcpClient, you can set the IP Address or domain name to connect to the server end of the socket. I see examples that use "localhost" as the first parameter for TcpClient. Is this just a broadcast over the network to find the server that has a TcpListener listening on the dictated port of the second parameter of the TcpClient declaration? With any IP address for TcpClient (I realize that's an option, though), how does "localhost" find the TcpListener server?
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Jul 31, 2008
I would like to know how is it possible to send data over the network using VB 2005 .... ! It must be capable of being the type of sending short text over the network just like chatting
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