HttpListener Does Not Work Too Well
Sep 19, 2009
I wrote a HttpListener console application just to test it. I have been able to get the Httplistener class to respond to request for the local host, but not for any other URL. Any ideas? All examples I have seen on the Web just parrot what's on MSDN but no one has actually said that they got it work for any other URL other than local host.
In my code, I will add a URL to listen to like:Prefixes.Add("http://junk1234:80/"It it registers just fine(no errors) but when I type in http://junk1234:80 in my browser, my application just sits there and does not respond.
This works just fine(+ is a wild card to listen to any URL):Prefixes.Add("http://+:8080/") Browser URL: Http://localhost:8080 But if I change the URL to Http://junk3333:8080, my Listener code does not see it even though it should see any URL on port 8080.
I am running on Vista Home Premium(.Net 3.5) but running my listener console app as a admin.
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Mar 30, 2009
what am I missing here.. I'm using the MSDN example but I want toread the xml that is coming as part of the XML..
Public Sub AsynchronousListener(ByVal prefixes() As String)
' spin up listener
listener = New HttpListener()
[code].....
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Mar 28, 2011
I have an httpListener exe that is working great. What I need to do now is make it a service (I think) so that when the server is rebooted, this program will start automatically. I found a few tutorials for making services and I got one installed, but when I started it, it said it took to long to respond. I was thinking that might be because I have a while true loop going in the onStart method.
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Aug 14, 2009
How do i allow the HttpListener in vb2005.net to allow outside access?
For testing purposes i have set it up to use the same ports as my webserver uses so there are no firewall issues.
the prefixes are set up to take the localhost on port 80 the realm is unset AuthenticationSchemes = Net.AuthenticationSchemes.Anonymous
it works just fine locally on the machine, but cant be reached by web browser on any other machine on my network
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Dec 28, 2011
I've got this code below that creates an HTTPLISTENER that is nicely waiting at listener.GetContext().How do I communicate with this from another VB app? I cannot seem to get WebRequest.Create to work with the URI that my HTTPLISTENER example is using. This line of code from a second app is not working:
Dim request As WebRequest = WebRequest.Create(prefixes(0))
Here is the code:
[Code]...
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Dec 28, 2011
I've got this code below that creates an HTTPLISTENER that is nicely waiting at listener.GetContext().[code]....
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Aug 6, 2011
When using ASP we can reference HttpContext.Current from anywhere in the code to get at the current http context.
I want to do something similar using HttpListener, so that I can access GET/POST data etc from anywhere in my code. Can I reference some global object for this, or do I need to explicitly pass the current HttpListenerContext object all through my code?
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Aug 8, 2009
In vb2005 how do you simulate a web browser's file download using Net.HttpListener?This current program functions somewhat like a webserver. how when a client from a web browser
asks for a file do i allow them to down load the file? currently the method will tell the browser that there is a file but it will fail after the client oks the file for download.
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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 24, 2012
I have a user interface app that allows you to drag/drop in files - and it turns them into HttpListener request POST's to another EXECUTABLE that I have running - let's call it BACKEND1. BACKEND1 will be running on a SERVER when this gets ready for production use. Lots and lots of users running the UI - all dragging in files - all getting POST'ed to BACKEND1 - with the file included as a memory stream in the POST. BACKEND1 responds to the UI with a "sequential" file number assigned to the file centrally on the server.
On the SERVER is also running another EXECUTABLE - let's call it BACKEND2. It's job is to work with the DRAG'd in files. Both BACKEND1 and BACKEND2 sit on the same SERVER. At the moment I am writing the memory stream to DISK in BACKEND1 - and POSTing the FILENAME to BACKEND2 for it to work on. Would it be better to not write the file in BACKEND1 but instead include it in the POST to BACKEND2 - where it can be written to DISK? Is having LARGE HTTP REQUEST's a burden when sent between two EXECUTABLES on the same machine?
My primary goal is to have a really available BACKEND1 talking the the UI instances running out in the world. I'm concerned that doing the file i/o in BACKEND1 is "expensive" - and I don't care about the performance of BACKEND2 as much. just looking for opinions. I guess ultimately I'll have to bench mark this myself in a production environment to get a real answer.
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Sep 28, 2010
I have a user interface app that allows you to drag/drop in files - and it turns them into HttpListener request POST's to another EXECUTABLE that I have running - let's call it BACKEND1.BACKEND1 will be running on a SERVER when this gets ready for production use.Lots and lots of users running the UI - all dragging in files - all getting POST'ed to BACKEND1 - with the file included as a memory stream in the POST. BACKEND1 responds to the UI with a "sequential" file number assigned to the file centrally on the server.
On the SERVER is also running another EXECUTABLE - let's call it BACKEND2. It's job is to work with the DRAG'd in files.Both BACKEND1 and BACKEND2 sit on the same SERVER. At the moment I am writing the memory stream to DISK in BACKEND1 - and POSTing the FILENAME to BACKEND2 for it to work on.Would it be better to not write the file in BACKEND1 but instead include it in the POST to BACKEND2 - where it can be written to DISK?
Is having LARGE HTTP REQUEST's a burden when sent between two EXECUTABLES on the same machine?My primary goal is to have a really available BACKEND1 talking the the UI instances running out in the world. I'm concerned that doing the file i/o in BACKEND1 is "expensive" - and I don't care about the performance of BACKEND2 as much.
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Dec 27, 2010
I am trying to use an Asynchronous HTTPListener to create a simple web server in VB .Net (Not ASP) This will be run as a desktop application. My only goal is to be able to request Server Variables from the client. Is there any way to do this from within a HTTPListenerWebServer? I am using the code from the MSDN VB .Net Samples:
[Code]...
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May 29, 2012
I found that when group by multiple values does not work well with VB.NET, but it works well with C# ,here are my code, is there something wrong with my VB.NET Code? Here is my VB.NET code:
[Code]...
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Feb 2, 2011
I have an application that requires data be entered, and after entering, a button is clicked to process that data. Clicking the button works just as it should--the data is processed properly. In constructing a test module, I provide a set of data values, followed by:
btnWhatever.PerformClick()
Nothing happens. I have used this syntax for years, and it has always worked flawlessly. I have triple checked everything else and isolated the problem to the failure of the PerformClick(). The PerformClick() is in a test subroutine that does nothing but fill textboxes and labels with default data, then calls the PerformClick() on the button to begin processing. Again, the button works fine, the data is entered as it should be, but the PerformClick() does not fire the click event.
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Aug 21, 2009
I have a form that works on my local Machine I created into. I have Office 2007 on this machine. I created the Form with the Excel 12 Reference. I move the Entire conetence of the Project folder to my work computer. Which has Office 2003. Do I need to recreate the form with the Excel 11 reference. I could not get the form to work on work computer. IT has a com error. I am acessing the EXE for the debug folder w/in the Bin Folder.
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Jul 25, 2010
will SQL statements that work in Compact SQL Server also work in the Express Edition of SQL Server?
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Jul 21, 2010
Dim pc As PrincipalContext = New PrincipalContext(ContextType.Domain, GetPath) ADUserInfo.PasswordVaild = pc.ValidateCredentials(LoginName, Password)
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Oct 19, 2011
I'm using vb2008 with DB MSA2007 (save it to MSA2003) on Seven(7)System After I create my project I build it(make exe). then I took the file of project (application) and the DB from Debug Folder.
I tried to run this application with DB on another computer it's system is seven and MSA2007 and work very well. then I run it on pc it's system XP and MSA2003. it showed this error
Application Error THE APPLICATION FAILED TO INTIALIZE PROPERLY (0XC000135). Click on OK to terminate the application
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Jan 8, 2012
I'm building a VB(2010) program to create the graphics for my laserprojector.The program works when I debug it in VB, but when I run the EXE program in the release directory, it doesn't work. The problem in the EXE program is theat I can't draw/view graphics in the picturebox..I coppied my whole program to a new VB project, but I'm having the same problem...In the original project, where the program works, there are no warnings or errors.
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Mar 28, 2011
I created a windows form application using Visual Basic Express Edition 2008 but I did not know I could not use it on the web, which is what I wanted but being new to VB I just got a lot of headaches trying to figure this out. It works fine as a windows app but now just recently I installed Visual Web Developer 2005 to so I could create a web application from the windows app.
It is a simple windows application of a datagrid but now I want to run the same design application I made in Visual Basic to Visual Web Developer Express 2005. Is this possible? And, what do I need to do? I have all of the associated files in my project folder in Visual Basic Express folder.
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Mar 14, 2011
how does look-up work in Visual Basic, I have done research on this but it does not explain. I have a Form1 called( Booking form) with 2 ComboBox's and 1 TextBox. each called (Destination_FromComboBox) and (Destination_ToComboBox) and (FareTextBox)and another form2 called (Fares Form) with 3 TextBox's each called TextBox1 (FromTextBox), TextBox2 (ToTextBox2), TextBox3(FareTextBox).So when I select (Booking Form) and Insert or select a Destination from (Destination_FromComboBox) and Insert or select a Destination To (Destination_ToComboBox) I want to read from (Fare Form/Fare Table) and give me the fare in FareTextBox on the Booking Form. Also on the booking I have 3 Radio Buttons
(RadioButton1 = 4 Seater Car, Normal Fare)
(RadioButton2 = 6 Seater Car, Time & HalfFare)
(RadioButton3 = 8 Seater Car, Double Fare)
But there is also a time Issue as well:
If the time is Between 05:00 & 23:59 then normal time should be used
If the time is Between 00:00 & 02:00 then time & half should be used
If the time is Between 02:00 & 05:00 then Double time should be used
I have watched loads of video's and looked through forums and other codes for the combination of the above, without success?
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Oct 19, 2009
I have this great way to use VB6 I treated my project like a .exe file.Say I want to work on c:work directory.I just save as the .vbp file to c:work directory
All the other files (.frm,.bas,.cls) files are in a special directory called library ALL of my .vbp files, in c:work1, c:work2, c:work3 refer to that one same directory.How can I do that in vb.net?
Why this is important? Bugs always happen all the time. If I just run .exe file, when bug happen, I cannot do a thing. However, if I run the project file and run the program in debug mode, when bug happen I can figure out what happen.
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Jan 23, 2010
I am a CS grad, but haven't had much to do with programming since my school days as I went the BA route.Anyways, there are a few things that I do manually on the computer and thought that I could probably save time by creating an application for them.But I'm not really sure how to start.I'd like to be able to keep a history of Completed eBay listing so that I know when the price point is good and when it is too high.I noticed that eBay has an RSS feed, so I think I can do it. Just a couple of quick questions:
1 - Can I instruct VB.net to open a web browser and read an RSS feed, or would I need to manually do this myself and then run the application?
2 - What is the best way to work with RSS feeds? Should I convert the data into XML first?
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May 23, 2010
I am trying to get a percentage that just does not seem to work.I am using WMI to get the Total Physical memory of my system and then the Free Physical Memory. Then get the percentage.
2147483648 - Total Memory
838028 - Free memory
According to Task Manager my physical memory is 59%. This is the code I am using but I can not get 59% or 41% that is free.
temp = FM/TM
temp = temp * 100
percent = FM * temp
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Jan 12, 2011
I have a simple application:Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
#If DEBUG Then
lblDebug.Text = "Debug"
#Else
lblDebug.Text = "Not in debug"
#End If
Now when I run it in VS, it prints "debug" like it should, but if i run the .exe, it still prints "debug". What do i have to do to get this to work right?
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Sep 22, 2011
I'm working with VB.net.I'm having problems while I connect my application to my database today so I wanted to add an error handling to close the form.The problem is that when I put Me.close in a form, this form still open. I used the Form.Closing event handler to verify that it was called, and then ran my application in step by step which showed that the event handler was called, but the application continues and the errors appears to the user.how to close a form properly without closing the application?
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Jun 1, 2011
I am modifying a couple of fields of a datarow and immediately calling AcceptChanges on this datarow. Technically, after calling AcceptChanges, the RowState of the datarow must be "Unchanged", but it is still "Modified". Why is this so?
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Oct 16, 2009
when i run the program the report prints to the printer without a preview
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Apr 24, 2011
I just finished creating my VB application and now when this application running on another PC, jumping out error (error image here [URL]..
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Aug 5, 2009
I am using visual absic 2008 express edition. I am trying to produce two (FromNode, ToNode) random numbers and store in an array (ArrayTo(NoConnections)). The array should not have same values at the same time and the aary should not have the same number or the other way around. For example, The array should not have numbers like 22, 55, 66Šetc If the array has 13 and 45 then 31 and 54 is not allowed in the array and vise versa.
[Code]...
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