VS 2010 Check If A Specific Port Is Open?
Jul 13, 2010I want to check if a specific TCP Port of an IP address is open.
How can I realise that?
ADVERTISEMENT
Open The Specific Port Of A Windows Computer?
Jan 15, 2010I tried to make a winsock program.But when i run, i have a SocketException "No connection could be made because the target machine actively refuse it."Any suggestions on what i should do? Im using 17477 port.By the way Im using my own computer to test it. So i have no idea why.How should I open this specific port in my own computer?
Is it possible that I could include it to could into my program so that i don't need to open the ports of each computer? Below is my code.
[Code]...
Check If A Port Is Open On A Particular IP Address?
Nov 24, 2011I have an application which need to send data to particular system on specific port. But the application gets hang if the target system port is closed.
I Want to know if a particular Port is open on a specific IP address so that i can continue my next task. PBL (Visual Studio 2010 Ultimate)
Check If A Port Is Open Using Sockets?
Feb 16, 2010I have written some code to check if a port is open. I'm currently trying to work with the system.net.sockets name space.I know that the easy way out would be to use AxWinsock, but I don't think the AxWinSock is very cool, nor do I think it's very professional when trying to make network applications in VB.NET.
I've got this Error message : Socket Exception Was unhandled, No connection could be made because the target machine actively refused it 127.0.0.1:1 IDK, Like I said, I'm new to the System.net.sockets namespace, I'm pretty good with other stuff in VB.NET, but when it comes to the serious stuff like the system.net.sockets namespace, I'm not so great.look at this code and tell me what I am doing wrong, I've manged to get this far, and I don't want to just give up and continue watching my movie.
[Code]....
VS 2010 - SerialPort Lagging - Serial Port Is Open And Waiting For Some Signals From The Dyno
Sep 9, 2010I have things set up so that the program is ready to start logging ,only when Recieving=true.This is controlled with Button1. So I click button1,Serial port is open and waiting for some signals from the Dyno.When 1 signal come it put a "1" in TextBox1 ,and for the second a "2" and so on. Thing is sometimes it starts right away, like I want it to,and sometimes it lags a fraction of a second, even though the Port is open.When it lags there are already 5 to 10 signals gone by before it starts logging 1,2,3,...and so on. Sometimes it don't start at all.Then I have to close and re-open the form and it works,but with lagging on the first "set"
"Textbox1 > 0 then" triggers a timer (not seen in this code)that samples Textbox1 once pre interval and writes the value to a listbox. On the upside as soon as a "1" is displayed in textbox1 the timer starts like it's supposed to.I noticed this behaviour before I added the timer and besides the timer has nothing to do with the signals coming from the SerialPort. I have my form setup so I can run "sets".Run one "set"...save...reset...run another "set" ...and compare.It's always the first "set" thats off.If I run multiple "sets" the first one is completely "whacked", and the rest are consistent.
Think this could be the SerialPort lagging,or code problems?
Public Class Form1
Dim resetValues As Boolean = False
Dim RPM As Double
[CODE]...
VS 2010 Open Files From A Specific Location?
Oct 21, 2009Im working on a way to use a Select statement to set the image of a picture box.
select case currentno
case 1
PictureBox2.Image = Image.FromFile(C:UsersValued CustomerDocumentsVisual Studio 2010ProjectsChiroReportChiroReportChiroReportPnt_GuideLAT CERVlatcerv52.jpg)
[code]....
The Select statement should work fine but the path to the file i want to open doesnt. Id love a way to reference the Pnt_GuideLat Cerv directory based on where my program gets installed on the Hard drive.
VS 2010 Check If File Is Open?
Jun 15, 2012would it be possible to check if any notepad or word file is open that contains the word 'test'?I was thinking something like the following.
Dim Process() As Process = System.Diagnostics.Process.GetProcessesByName("notepad")
Dim Process2() As Process = System.Diagnostics.Process.GetProcessesByName("word")
For Each p As Process In Process
If p.MainWindowTitle.Contains("test") Then
[code]....
VS 2010 Check If Window Is Open And If It Is Then Msgbox?
Nov 2, 2010I just want a button to check if a certain process or window is running and if it is i just want it to show a message box.
View 2 RepliesSearch Data From Database With Some Check Box And Text Box When User Select Check Box Specific Function
Dec 15, 2011My application is like this : i have to search my data from database with some check box and text box when user select check box specific function go on and then when user enters some range of value in textbox then the result will shown in data grid view after that i can print it by selecting data
my vb.net code is as follow:
Imports System.Data
Imports System.Data.SqlClient
Public Class XtraForm1
[CODE]............
I m also pasting the demo picture.
Check Specific Pixels In A Picturebox To Check The Color?
Jan 17, 2010Is there a way to check specific pixels in a picturebox to check the color? Basically what I have is a black square with some white dots, and I want to find the position's in the picture of the white dots.
View 2 RepliesPrint To A Specific USB Port?
Dec 29, 2009im a independent programmer and my most recent job has me doing somthing ive never had to work with before and i was hoping to get a few answers here or be pointed in the right direction
question 1
is there a way to print to a specific USB port in VB if so links to reading material or better yet code
question 2
is there a way to program to open and send and recieve information from a USB port lpt port and a serial port using VB
and if so can i again be directed to some reading material or better yet code
i understand these are not typical questions but they are a small part of a bigger whole that we are trying to implement while we look into using Vb as the language we will use
VB 2010 Open Form B To Specific Record From Form B Datagrid
Mar 15, 2012I have form A that has a datagrid on it, I want to be able to double click a row in form A and open form B to that record.
I know how to do that in VBA in Access 2007, but I am having trouble comprehending the procedure for VB 2010.
TCPListener - Listen To Particular IP On Specific Port
May 26, 2009How can I ask my tcpListener to listen to particular IP on specific port? I want my tcpListener to listen to the local IP of the machine. I can get the ipaddress of the pc using Dns.GetHostAddresses(). But, if pc have multiple ip's how can I know which ip address is correct? From tcpClient class I am connecting to the server. So, I know the server ip and so I want to specify ipaddress to my tcpListener class to listen on.
View 1 RepliesChecking If A Port Is Open - If It Is Open Then Return True, If It's Closed, Return False?
Dec 28, 2010I'm making a Visual Basic GUI application to display whether a number of my ports are open for people to know whether things like my website and my Minecraft server are open.My problem is I have absolutely no idea how to do this in Visual Basic.Basically, I'm asking for something which sends a signal to an IP with a specific port, if it is open then return true, if it's closed, return false. Similar to: http:[url]....
View 1 RepliesC# - Send And Receive A Tcp Message To A Specific IP/Port In .NET?
May 18, 2011I'm trying to send a message to a specific IP/Port and receive a reply in an ASP.net website, i tried the method describd at the following link but it didn't work for me as you can see SocketException An attempt was made to access a socket in a way forbidden by its access permissions
View 1 RepliesTCP Protocols - Sending Command To Specific Port On Same Computer
Mar 10, 2011I am working on writing a program that needs to send a command to a specific port on the same computer, I have that working fine. There is another piece of software running that is listening to that port for some commands (read on).
Dim myTcpClient As New TcpClient
myTcpClient.Connect("127.0.0.1", 61225)
Dim networkStream As NetworkStream = myTcpClient.GetStream()
However when I try to send a command I get no response...
Dim outStream As Byte() = System.Text.Encoding.ASCII.GetBytes("0x33")
networkStream.Write(outStream, 0, outStream.Length)
networkStream.Flush()
I have been given a list of protocols that I need to send to that port. What I have been told is that the size (in byes) is 1 and the value is "0x33" with no parameters. I am completely new to sockets and sending data through tcp.
C# - Open And Use A TCP Port?
Jan 17, 2012I need to transfer data between several computers in a network using my app. I thought of using TCP ports. how to open and use them? I only want to make a file transfer and chat app that works offline.
View 3 RepliesCheck If Port Is Alive?
Sep 18, 2011I am working in Visual Basic 2010 and need to check if a port is alive on an ip.I am currently using this code
If My.Computer.Network.Ping("85.250.180.71") Then
TextBox2.Text = "Server Online"
Else
TextBox2.Text = "Server Offline"
End If
Open All Serial Port?
Jun 9, 2011how to open all serial port in vb.net? i know how to open by getportname..but how to open all??can we do it?
View 2 RepliesOpen Port 433 In Windows?
Apr 1, 2010how can i open port 433 in my windows
i don't want any code just i want to open open it
Check Or Map If Parallel Port Is Mapped?
May 31, 2010i want to work with it in vb. 1st i want to check if port is already mapped or not, if not then map it and once done remove the mapping. The one way is using shell and pass command in it, but not sure how to get already map status and also wondering if there is any other method to get it done.n :)
View 1 RepliesCheck State Of Serial Port?
Jan 8, 2011I am very new to this but i have with alote of help maked a program that comunicates with a relay board over rs232.
[code]...
Check To See If A Serial Port Even Exists?
Feb 9, 2010I'd like to check to see if a serial port even exists. I know that if it doesn't, there is an error thrown when you do a port.open So, I would imagine that doing a simple IF port.isopen won't work?I looked at all the methods on the class and don't see anything obvious on how to do it.I just want to see if the hardware exists on the PC and set a boolean variable if it does when the form loads.
View 3 RepliesApplication That Opens A Session To A Specific IP Port / Writes To A Test File Everything It Receives
Feb 20, 2009I've had a search through a number of extremely useful articles on the forums, however rather than reinvent the wheel I thought I would ask if anyone already had what I am looking for..A simply little VB app that opens a session to a specific IP port and then writes to a test file everything it receives. If the connection drops, simply re-stablish it and keep listening for text to write to the file.
View 1 Replies.net - Can't This Code Open A Serial Port?
Sep 1, 2010Public Class my_class Dim WithEvents COMPort As New System.IO.Ports.SerialPort
Public Sub FindReader()
Dim ports As String() = IO.Ports.SerialPort.GetPortNames()
Dim port As String
For Each port In ports
[Code3]...
When it runs, it shows a single COM port "COM1". I am assured that the device attached to it is a standard 8,n,1 and uses 9,600 baud. The exception is "Acess to the port 'COM1' is denied".
Can't Open A Serial Port For Reading?
Aug 10, 2009I am trying to open a GPS device on a serial port but no matter what I try I just keep getting an IOException. This is on a pocket PC BTW.
[Code]...
Error - The PortName Cannot Be Set While The Port Is Open
Aug 6, 2009I have this problem says that "the portName cannot be set while the port is open". When this errors occurred, my application on sending sms could not work. Before I edit the application can work but after making some changes and ask help in this forum, the application does not work and gives errors and it says "the portName cannot be set while the port is open".
Imports System.Windows.Forms.Form
Imports System.Text.Encoding
Imports System.Threading
Imports System.IO.Ports
[code]....
How To Open / Read / Write In USB Port
Feb 13, 2009How to open/Read/Write in USB Port
View 3 RepliesHow To Open Virtual Serial Port
Feb 25, 2009I wrote a program that uses the following class from that site: VB.NET Tutorials - Serial Port Communication In VB.Net. The problem is that I cannot open a virtual serial port, and the second is that I want to make the communication asynchronous.
This is the subroutine which reads from the port:
#Region "comPort_DataReceived"
''' <summary>
''' method that will be called when theres data waiting in the buffer
''' </summary>
''' <param name="sender"></param>
[Code] .....
Serial Port Checking If Open
Jul 20, 2010In VB6 I had to always check if the port was open or not. But with VB.NET and the new Serial Port control I don't see any.If SerailPort1.Open then statements. In fact when I tried to use the code I got Expression does not produce a value.So does this mean that we no longer have to check to make sure the port closed?Is there a way to check if the port is open or not?
View 1 Replies
