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Hey guys,
I've been looking everywhere for two days now with no luck, so I'm turning to your wisdon and generosity with this.
I have a form with a webbrowser control on it, and I need to change the proxy it is using on the fly. I have read everywhere about updating the registry keys, but I have to restart the browser for that to take effect, which is not an option in this project. I really need an immediate update (just like when you set it manualy in ie)
I also noticed that setting the browser to "offline mode" and then back to online mode works, and the webbrowser control has an isoffline property that says it "sets" or "gets" however when i try to set it, it says it's read only. Very confusing.
I'm still pretty new to .net, and well vb in general, (i came from visual foxpro) point being any code samples you could offer would be ever so greatly appreiciated.
Thank you very much for your time.
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The WebBrowser control uses the system's proxy settings. You can't really change them without chaning the proxy for everything that uses IE.
There is a WebProxy[^] class that you can use to define your own proxy settings. However, this class will NOT work the the WebBrowser control. It will only work with classes that are based on the WebRequest[^] class. This enables you to construct your own web browser will just the support you need to get your job done.
Dave Kreskowiak
Microsoft MVP - Visual Basic
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I don't mind if it changes the system proxy settings, if that is an easir/quicker short term fix.
I will check out the links you sent, thank you very much.
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Uhhh, this won't change the system proxy settings. It'll let you make a copy of them for your applications own use, but not change the systems version.
Dave Kreskowiak
Microsoft MVP - Visual Basic
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I guess what i'm asking is would it be easier to change the system proxy settings?
So that I can use the webbrowser control?
or is there no way to do that with out having to restart it?
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I have a number of stored procs in SQL Server that I call from my VB code. Some of them can take up to 2 hours to run and I am getting timeout errors in VB. Is there a way to extend the timeout interval or even switch it off for these stored procs (returning to defaults after the proc has run)?
Thanks in advance,
John.
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Not for two hours, no.
A much better solution would be to fire off a scheduled job on the SQL server and when it completes, use SQL's Notification Services to alert your VB app that it completed, if it's still running that is. Or some other disconnected solution.
The reason being is that you can't trust the VB app, or the machine it's running on for that matter, to stay running for that entire time. A power failure would result in a bad situation if your app must be counted on to be running the entire time.
Dave Kreskowiak
Microsoft MVP - Visual Basic
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Thanks Dave.
I hadn't thought of that angle. I'll give your suggestion a go.
John.
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in my vb.net project i have a requirement of parsing a word document and extract all the names and telephone numbers and the email ids
can any one help me
mail me at rajesh.batchu@cesltd.com
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You can interact with Word using COM or .NET libraries. You cannot open a Word doc on a machine that does not have Word installed. Once you can access the text, a regex will find the phone numbers and emails, but names will be harder unless the document has a known format.
Christian Graus - Microsoft MVP - C++
Metal Musings - Rex and my new metal blog
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word is installed in my system and i want to open a word documet in half of my screen can any one help me
mail me at rajesh.batchu@cesltd.com
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I told you what you need to do. If you want to control Word, you need to do it via COM or there's a .NET library you can use. I'd be surprised if there were no CP articles that show how.
Christian Graus - Microsoft MVP - C++
Metal Musings - Rex and my new metal blog
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Hi All.. I am having a few issues on creating a new form by raising an event from the child thread. I have created a small scenario demonstrating this, please could anyone give some sugestions.
' Main Form loaded
Dim f As New Form2
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
start.start()
End Sub
Dim WithEvents start As New Class1
Private Sub newf()
'Dim f As New Form2
f.Show()
f.Visible = True
End Sub
Private Sub start_cge() Handles start.cge
newf()
End Sub
End Class
' Class containg the thread create and event
Imports System.Threading
Public Class Class1
Public Event cge()
Public WithEvents tr1 As New System.Windows.Forms.Timer
Dim t As Thread
Public Sub start()
tr1.Interval = 2000
tr1.Start()
End Sub
Public Sub ttick(ByVal s As Object, ByVal e As System.EventArgs) Handles tr1.Tick
t = New Thread(AddressOf ev)
t.Start()
End Sub
Public Sub ev()
RaiseEvent cge()
End Sub
End Class
Any help would be greatly appreciated
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What's the problem exactly ?
You can't create UI elements on different threads, if they are going to interact. All operations for a UI element need to happen in the thread that created it. This is an artificial limitation, new to .NET 2.0, and you can turn it off if you want to, but you'd do better to live within it.
Christian Graus - Microsoft MVP - C++
Metal Musings - Rex and my new metal blog
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Hi Christian, thanks for the response.
Sorry should have mentioned the problem. The problem is form2 displays then vanishes, or the controls do not update in the main form when and event is raised from the child thread. The code snippet is a small project to see if I can get around this instead of breaking my proper program it will be inserted into. Instead of a timer in the example I have a tcpclient with the socket reader stuck in a while loop eg
temptcpclnt = New TcpClient
temptcpclnt.Connect(details.ServerName, details.Port)
stmIn = temptcpclnt.GetStream()
tcpThd = New Thread(AddressOf ReadSocket)
tcpThd.Start()
The readsocket raises an event to the mainform to create a new form or update a grid when it has recieved all data
hope this explains a little more
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Sounds likely that the mainform routine is creating a local variable for a form, and calling show, which would then cause it to go out of scope and get garbage collected. Can you post the routine so I can see if this is the case ? If it is, you need to keep a reference to the object, probably in a collection if the number of objects is likely to change at runtime.
Christian Graus - Microsoft MVP - C++
Metal Musings - Rex and my new metal blog
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This code runs in my class which is running the thread
Public Sub LoginUser(ByVal Str As String)
If Mid(Str, 1, 2) = "UD" Then
Dim Userdets() As String
Str = TruncData(Str)
Userdets = Microsoft.VisualBasic.Split(Str, ",", -1, CompareMethod.Binary)
CnDetails.UserName = Userdets(3)
CnDetails.Curr_Id = Userdets(0)
CnDetails.Department = Userdets(1)
CnDetails.level = Userdets(2)
'Tell LoginForm That all is ok and continue
RaiseEvent LoggedIn(True)
End If
This is the code that the event raises in the form that created the class object
Dim WithEvents Login As New SocketControls.SocketControl
Private Sub Login_LoggedIn(ByVal Ok As Boolean) Handles Login.LoggedIn
If Ok = True Then
Hideloggin()
End If
End Sub
Private Sub Hideloggin()
'232, 168
Dim NewForm As Form
Try
'Application.DoEvents()
NewForm = New Form2
NewForm.Show()
Me.Refresh()
'Me.WindowState = FormWindowState.Maximized
'Me.FormBorderStyle = FormBorderStyle.Fixed3D
'Me.MinimizeBox = True
'GroupBox1.Visible = False
'GroupBox2.Visible = False
'lblErr.Visible = False
Catch ex As Exception
End Try
End Sub
I was reading some of the blogs on this and a few people said that the child thread even though raising an event the event will still run on the child thread, so the child thread needs to pass the request through to the parent thread to execute that bit of code so it runs there. I am not to sure on how to do this though
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ryan@theglenns.co.za wrote: Dim NewForm As Form
Try
'Application.DoEvents()
NewForm = New Form2
NewForm.Show()
OK - there it is. As it's a member variable, and you don't put a reference to it anywhere, as soon as this method ends, NewForm is available for garbage collection, and so it disappears ( it didn't live long, so it's up for first cycle collection ). Create a list of Form objects, and push NewForm onto the list. OR make it a member variable if there's only going to be one. Then it will not be collected, and it will live on after the method ends.
Christian Graus - Microsoft MVP - C++
Metal Musings - Rex and my new metal blog
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ok, sounds good, hate to ask this, could you please give me a small example. There will only be one new form created from the event once the user is logged in, this form will display the data for the user. I owe u one if it works
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Sure:
Dim NewForm As Form
Private Sub Hideloggin()
if not NewForm is Nothing NewForm.Dispose() ' Delete it if it's already been created before
Try
'Application.DoEvents()
NewForm = New Form2
NewForm.Show()
Me.Refresh()
'Me.WindowState = FormWindowState.Maximized
'Me.FormBorderStyle = FormBorderStyle.Fixed3D
'Me.MinimizeBox = True
'GroupBox1.Visible = False
'GroupBox2.Visible = False
'lblErr.Visible = False
Catch ex As Exception
End Try
End Sub
Basically, NEwForm becomes a member, and I add some code to clean up memory if it's called more than once. You may want to play with that part of it, but broadly, it should work like that, even without the 'if not newform...' line.
Christian Graus - Microsoft MVP - C++
Metal Musings - Rex and my new metal blog
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Nope didn't help, I think it may be because the event raised within the child thread to call the event handler on the main form tells the code to run in it's own thread and not the parent. Is there any way to tell the child thread to execute the code on the main thread?
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No, I don't know of any issues here, or ways to deal with them, sorry.
Christian Graus - Microsoft MVP - C++
Metal Musings - Rex and my new metal blog
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ok no problem, I will check some more blogs out and hopefully find something, thank you for your help
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It may be the threading because even if I try to change the layout of form1(main form) from the event it hangs the program ie
Me.WindowState = FormWindowState.Maximized
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Hi Christian
I managed to get it write and thought you may be interested, it's pretty funny it only takes two lines of code. It was the issue of the child thread. The way to get round the problem is :
Imports System.Threading
Public Class Test
Public t As Thread
Public Sub Start()
t = New Thread(AddressOf tstartdes)
t.Start()
End Sub
Public caller As New MethodInvoker(AddressOf newform)
Public Sub tstartdes()
Form1.ActiveForm.Invoke(caller)
End Sub
Dim F As Form
Public Sub newform()
F = New Form2
F.Show()
End Sub
End Class
The method invoker is what does it, it is then invoked from the main thread running the main form.
Yay ... It's working
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