VS 2008 ASYNC Ping - Writing To TextFile?
Dec 6, 2009
I was trying to edit to get the reults output to a text file. I needed to do this for a few hundred IP addresses, and found kleinma's code. It works great as is, but since the number of IP addresses to ping is so large, I lose some of the info from the console session. I tried to make changes to write the information into a text file, but it doesn't output the results. I am relatively new to VB.NET, so I was wondering if you could please point out the flaw(s) in the edited code. I was trying to use the My.Computer.FileSystem.WriteAllText(File, lineContent, True) method to do this. This does export the IP address list just fine, but the results of the async ping to not get output.
'KLEINMA
'WWW.VBFORUMS.COM
'THE PING CLASS IS IN THIS NAMESPACE
Imports System.Net.NetworkInformation
[code]....
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Jun 3, 2009
I am using a DataGrid object that updates every 2 seconds using a timer control.I am trying to have the ping request sent asynchronously to speed up the process. I'll explain what I am trying to do in the code in rem statements..[code]
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Feb 3, 2009
I am trying to run this
vb
Public Sub SendPing(ByVal strHostname As String, ByVal objSelectedNode As TreeNode)
Try
Dim objPing As New Ping
[code]....
My problem is that in this code (and I know it's a lame way to do it) I'm checking to see if the node is Green after the Ping has been completed to determine if the ping was successful. I would prefer to return a boolean value to be True if the ping was successful.
When it executes the SendPing on the DragDrop function, it starts that thread and executes the If statement to determine if the node is green, but the ping isnt complete. Now I have to do this function on many nodes at once, so I dont want this to be a single thread. Is it possible to return a value from an async call and then execute a function after that value has been returned, or will this have to be a single thread?
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May 17, 2011
I want to write a line into a text/.cfg filethe line is = name "ishtiak"i need a sapce between name & "ishtiak"the text "ishtiak" is loading from a textbox called textbox1....i dont want in the text box my name like this "ishtiak" it will be withot "" like this ishtiakbut in the text file it will add "" before & after my nameso the question is1.how to add space between name & "ishtiak"? like this = name "ishtiak"2.My textbox text will be ishtiak,but it will be written like this "ishtiak"Here is My Project Screen & Project Code
Code:
Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
[code].....
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Nov 7, 2010
just another little problem here! Trying to write a quiz for a college portfolio and having trouble with writing to a .txt textfile. On one form(form4.vb), I have a listbox that picks up the information held within a notepad textfile called "usernames" which contains names of quiz users. When written in manually to this textfile, my listbox picks it up fine, however, on a different form(form3.vb), I have a textbox where a user inputs their name, this is supposed to go to the "usernames.txt" textfile to be picked up by the listbox on the other form but instead, it does not write anything at all and if there is already text on this textfile, it wipes it all out.I also have to use the application.startup path instead of the usual C:my documentents etc so i would have to begin with something like this: (Note: code is a little mixed up due to messing around with different variations but this is just a example)
[Code]...
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Mar 7, 2011
i want to rewrite a text file with information already added to it but with my current code it just adds it to the end of the file is there a way to rewrite the entire file with new information.
Private Sub writebtn_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles writebtn.Click
Dim bookfile As StreamWriter
If OpenFileDialog1.ShowDialog() = Windows.Forms.DialogResult.OK Then
bookfile = File.AppendText(OpenFileDialog1.FileName)
[Code]...
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Jul 9, 2010
I'm writing a program that retrieves certain lines from a textfile. This textfile is rather large, so is it possible to have a progressbar that shows the progress when it retrieves?
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Jul 8, 2009
i have tried altering some code i have to ping an ip address and store the result in an access db.i had it working when i had the ip hardcoded in as a string but I am now gettin an error.instead of having the ip address hardcoded in to the code i want it to be read in from the access db but im now getting this error:System.nullreferenceExceptionbject reference not set to an instance of an object at...button1.click event args ei have underlined the piece of code i tried to change
Imports System.Data
Public Class Form1
Dim Ping As Net.NetworkInformation.Ping
[CODE]...
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Jun 3, 2010
I'm trying to write a 'developer friendly' wrapper for the Windows API EnumWindows - the problem is that the API uses a callback function that gets invoked on another thread, where as I want my wrapper function to simplify this and make it more useful by working like any other normal synchronous function and just returning a value.
Now if the API just called the callback once that would be fine, as I would just call the API and make the wrapper function wait until it got a signal from the callback function telling it to continue... but the API calls the callback function over 100 times (once for every window handle that exists). The biggest problem is that there is nothing that indicates that any particular call to this callback function is the last one, so my wrapper function has no idea when it is safe to continue and return the list of window handles to the caller.
The only solution I could think of is to do this:
1. The wrapper function calls the API and starts a timer that waits 2 seconds before it raises the Elapsed event. The wrapper function then pauses until it receives a signal (ManualResetEvent)
2. Each time the callback function is raised by the API on a different thread, it stops the timer (so this is before the 2 seconds have elapsed), adds the current window handle that was passed in by the API to the list of handles, then starts the timer again.
3. If the timer reaches its 2 second interval then it is assumed that we are at the end of the windows because otherwise the callback would have stopped the timer. So the timer's Elapsed event handler is what signals the original thread (that the wrapper function is executing on) to continue as we now have a complete list of windows to return.
This works fine and does exactly what I want... but I dont like it.
I dont like forcing the caller to wait an extra 2 seconds after the API has done its last callback but more importantly I dont like assuming that the API will never take longer than 2 seconds between callbacks. In reality on my PC it is never anywhere near that long between callbacks, it is something like 200 miliseconds, but I have no idea how long it would be on a slower PC and I want this to be completely reliable.
[URL]
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Dec 21, 2009
I am working on moving a project from VB6 to VB 2008 Express. [Code] When I connect to mysql db in VB6, I connect using adAsynConnect. This way, I have a "Loading..." animation display while a connection is attempted. Is there a way to do this in 2008 Express? Or something similar I could read up on?
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Dec 30, 2011
I've created an httplistener and I'm using the async method it has.Starts like this on a BUTTON click in my test app
Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
Dim prefixes() As String = {"http://*:8080/HttpListener/"}
StartRequests(prefixes)
End Sub
[code]....
This forces the callback to fire - for some reason that I don't quite understand and it gets this error...
Quote:
The I/O operation has been aborted because of either a thread exit or an application request at this line
Private Sub GetContextCallBack(ByVal result As IAsyncResult)
'Dim listener As HttpListener = CType(result.AsyncState, HttpListener)
Dim context As HttpListenerContext = m_listener.EndGetContext(result)
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Feb 15, 2010
code for ping an ip? i want to do something like pinging in cmd, with shwoing results in a richtext box or listview...i found some codes and they don't work and i didn't make it up.
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Feb 18, 2010
i have a little problem with the ping in vb. i have a richtextbox and i want to write in a text file the result. I done it, but my txt file loks like this:
[Code]...
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Sep 14, 2008
Ok so for a while now ive had a program that pings about 15 computers on my network, but the way i have it is pretty messy, id like to somehow make the code a bit cleaner. so what i have is something like this
[Code]...
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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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Jan 19, 2012
I have a sub that I just discovered does not work for my windows 7 users but works fine for my windows XP users. This is basically a sub for a ping monitor to ping devices on a timer. What happens is that when the windows 7 user tries to ping, it always reports "down" on a windows 7 whether actually up or down. But, windows xp will report correctly with "up". 3 different windows 7 boxes, users say it worked before. Can't quite debug correctly as i'm on xp myself and it works just fine. Also, I haven't changed anything in the code in quite awhile and this is a recent bug that just started.
Private Sub Timer1_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Timer1.Tick
Dim itm As Object
Sec = Sec - 1
If ListView1.Items.Count = 0 Then Me.Close()
If Sec <= 0 Then
[Code] .....
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Mar 23, 2011
Is there an easy way to just ping a server by IP or URL and return the minimum, maximum and average milliseconds? Actually the same results I get in CMD when using the ping command. Can't find any tutorial that describes it. So let's say I have a Textbox1 and a Button1 and a Label1 for the results. How can I do it?
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Jan 3, 2010
I work as an IT Administrator and manage a few Servers, Routers, VPN Connections over a number if locations. What I am wanting to do is create a vb.net app that will go out and ping say every 2-5mins each of the servers, routers, that are listed and then shows beside the Hostname a Green Circle which means online and if its a Red Circle its offline, and the screen refreshes if their is a problem or a device / service comes back online.
Then if its offline email a particular email address showing the hostname of either the server or router and which location saying its offline. If possible to make it easier to change the devices to show possible have a txt file or something like that with the Hostname, IP Address, Location.
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Oct 18, 2010
I am trying to create a textfile and write some lines into the textfile. However, the code that i am using can only write when the textfile is already created in the directory.
For this case, can i actually allow my script to search if a textfile is being created, if not create a textfile ???
Dim pathdir As String = "C:workingdir est.txt"
If System.IO.File.Exists(pathdir) = True Then
Dim objWriter As New StreamWriter(pathdir)
[code].....
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Apr 26, 2011
I'm working on a program for a class of mine but the ideas of arrays from a textfile just doesn't seem to click.
When the program loads, it should display the title of 17 books from the textfile.After, the user should be able to click a book title in the ListBox then click Compute Inventory to display the information below, which should be obtained from the textfile.
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Feb 27, 2011
I would like to save a big textfile in the same format . I mean when I open it on a richtextbox and save it , the text loose is space .Exemple:
[Code]...
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Jan 31, 2011
I need to check the size of textboxes in a webpage. I have already written the function which retrieves the maximum size of textbox and which writes the html codes of the webpage in a textfile. suppose i have these lines in my textfile:
<input type=text name=firstname size=30/>
<input type=text name=surname size=50/>
<input type=text name=address size=40/>
How can i change the size of all textboxes to 50 (the maximum size) in the textfile itself?
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Feb 7, 2010
I am trying to add a player registration form to a textfile. And i have a few problems.One of these is that when adding to the textfile, it isnt recognising the selected value in a checkbox (checkbox is used to distinguish between a goalkeeper and an outfield player). Can you tell me what should I be writing to make this happen, - "chkGoalkeeper.??? = "" "
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Jan 22, 2010
One of these is that when adding to the textfile, it isnt recognising the selected value in a checkbox (checkbox is used to distinguish between a goalkeeper and an outfield player).Can you tell me what should I be writing to make this happen, - "chkGoalkeeper.??? = "" "
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Nov 18, 2011
How do i count the number of visible characters in a text file in vb 2008 (ignoring spaces, tabs, carriage returns, spaces etc) ? I need to display this amount in a label.
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May 9, 2009
Everytime I go to save my listbox to a file (the same text file each time) I'm trying to overwrite the file (old list) with new file (new list), but it just adds my current list to the end of the list that was already in the text file to begin with..
[Code]...
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Sep 6, 2011
here is my code
Imports System.IO
Public Class Form1
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As
[Code]...
check how to remove the extra char in listbox "[]" like this
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May 17, 2011
I have multiple textbox,I want all of them to read whats inside a text file,but I dont want multiple text files,I just want one.
Here is my code that lets you read a whole text file.
vb.net
Dim FILE_NAME As String = "Directory"
If System.IO.File.Exists(FILE_NAME) = True Then
Dim objReader As New System.IO.StreamReader(FILE_NAME)
[code]....
But I just want it to read certain lines For Example on textbox1 should only read the line <vote>texthere</vote> and so on,
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Jul 21, 2009
I'm using this code to read through each line in a textfile, and remove all that starts with a spesific "searchword":[code]But there are chars in the original textfile, that don't display the same in the new file.
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Mar 11, 2012
find the attached text file. i need to insert the contents of the text file ( as colummns) into an access database how to make the data in the text file as column wise and then store it in the database.
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