VS 2010 : HttpWebRequest In A Loop Works Only Once?
Jan 5, 2012
I�ve had success using the GET method to retrieve a series of web pages but my new challenge requires me to use a POST > GET combo. I can get it to work once just fine but no more. I get the feeling that something isn�t closing or completing properly. When I try to do the second GetRequestStream() I can see from my sniffer app that nothing is being sent so when the next command to stream the POST data to the request session it fails. I removed it all from the loop and simplified it as much as possible. Can someone tell me why it fails?
Also as a general question is my tack or reusing WebRequests viable? Or is there a �best practice� for looping a POST > GET combo? I�ve been assuming that since nothing in the WebRequest changes besides the post data I�m sending, even its length remains the same, that I should be able to re-use it.
Dim Cookie As New CookieContainer
Dim encoding As New UTF8Encoding
Dim byteData As Byte()
[code]....
Note: The section after the �Experimental comment is a surrogate for the second iteration of the loop. The GET that normally follows the POST section has been removed.
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Aug 11, 2009
I assigned an integer as 1, and looped my program using:[code]I can recieve the packets without looping, but once i loop, i receive nothing.
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Jan 14, 2011
I am trying to loop through an array and perform an httpwebrequest in each iteration. The code seems to work, however it pauses for a while (eg alot longer than the set timeout. Tried setting that to 100 to check and it still pauses) after every 10 or so iterations, then carries on working.
Here is what I have so far:
For i As Integer = 0 To numberOfProxies - 1
Try
'create request to a proxyJudge php page using proxy
Dim request As HttpWebRequest = HttpWebRequest.Create("[URL]")
request.Proxy = New Net.WebProxy(proxies(i)) 'select the current proxie from the proxies array
request.Timeout = 10000 'set timeout
[Code] .....
I have tried a using block, eg:
Using response As HttpWebResponse = request.GetResponse()
Using sr As StreamReader = New StreamReader(response.GetResponseStream())
Dim pageSourceCode As String = sr.ReadToEnd()
'check the downloaded source for certain phrases, each identifies a type of proxy
[Code] .....
Does the try catch statement automatically close the response, or do I need to put something in Finally? If so, what? i cant use response.close() because its declared in the try block.
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Dec 8, 2011
I am trying to understand how a for each loop works and am having some trouble. I am trying to create a program that will query a sql database, pull back the information and store it. I currently having it writing to a text file, and would like to take the information (such as name) and compare it to another list where the name is equal. However I am not exactly sure how the for each statement really works. I have looked at numerous sources and it doesn't make since to me as you can probably see from what I have put in here.
HTML
Public Class Form1
Public Sub newarrest()
Dim strsports As New System.Collections.Generic.List(Of String)
Dim employeelastname As New System.Collections.Generic.List(Of String)
Dim cnPodaci1 As New SqlConnection
[Code] .....
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Apr 29, 2011
i need assistance in for each loop in vb.net 2005. that what is this for, why we use it, what is its syntax and where we need to use etc etc etc....
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Oct 26, 2011
While Loop Works then doesn't?
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Mar 8, 2012
At the moment my problem is when the function is called If I run it without line 3' MsgBox("bfdbfbniu") the x & y aren't being returned, however when I put a msgbox they are? I don't understand why it would work with a textbox, in comparison to without one. I honestly think the msgbox() should have no effect;
'If CPU is second
If count4win = 1 Then
MsgBox("bfdbfbniu")
[Code].....
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Oct 5, 2010
My For... Next Loop will not work and I cannot for the life of me figure out why. I have tried to display the results in a label and a text box with multiline enabled. Doesn't seem to matter. It's probably something obvious I have been overlooking for 2 hours.
Option Explicit On
Option Strict On
Option Infer Off
[Code].....
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Mar 26, 2009
I have written a pontoon game for a college project but i have a problem in which my loop only works when there is a breakpoint in it.The counter is incrementing as i have used a msgbox to display it. The procedure runs the loop and returns the same value in all locations in the array. With a breakpoint it displays correctly in the array.
here is the
Dim aryCardValue(0 To 10) As Short
Dim aryCount(0 To 10) As Short
Dim i As Short
[code]....
I have used the cards procedure in other programs and it worked fine.
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Mar 4, 2011
My app is a fairly simple and im sure with the right knowledge this would take 2 minutes.. but sadly iv been at it for hours. So my scenario here is a huge network with 20+ file servers all with data spread out across them it can take hours to find the folder required.
Hence this app.. so it consist of a input box, progress bar and a button, using FileSystemObject I plan to interrogate a directory to see if a folder exists (folder specified by user input) however it need to check multiple directories, in my old app I used a list box which wrote to a text file allowing the user to add additional directories then using if statements proceeded through the servers.. however they have added that much that my IF's have ran out really because i know it should have been a loop
Imports System
Imports System.IO
Public Class Frm_main
Private Const FILE_NAME As String = "C:directories.txt"
Dim objReader As New System.IO.StreamReader(FILE_NAME)
Dim Lines() As String = IO.File.ReadAllLines(FILE_NAME)
Dim Dir As String
[CODE]...................
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Dec 28, 2011
What I would like to know is how to obtain form input elements during an httpwebrequest?
[Code]...
Is it possible to obtain these input elements during an httpwebrequest without having to view the html code?
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Jul 1, 2011
How do I check if httpwebrequest is doing what it needs to do?
Since theres no webbrowser involved your kind of left in the dark and cant actually see if what you programmed worked.
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Nov 21, 2011
I'm trying to send some data onto a server. The data is an XML in form of string and and image encoded to base64.The problem is that the server says '404 Not Found', just as if I had an incorrect URL, but my URL is 100% correct. I can get data from the server using GET, but when I try to POST it doesn't work.I checked it in Fiddler and it first gets z 401 error (not logged in) and then the 404 error, which results in an exception.Can anybody please have a look at the below code and tell me if there is something I'm doing wrong?
vb
Private Sub Button5_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button5.Click
[code].....
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Jul 6, 2009
I am using a System.Net.HttpWebRequest class to download source-codes from a website, in an ASP .NET application.
The problem is however, that the ASP .NET server hosting my application is located in the United States. This means that when the application downloads source-codes of a specific page, the page being downloaded thinks that it needs to send the United States version of the page itself.
I need that to be customizable.
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Aug 11, 2011
here is a quick example
vb
Dim linkd As String = "http://abc.com/file/tk/asdfasdfasdfasdf./me.avi" req = WebRequest.Create(linkd) req.UserAgent = "Mozilla/5.0 (Windows; U; Windows NT 6.1; en-GB; rv:1.9.2.8) Gecko/20100625 Firefox/3.6.8"
but when i debug i found that httpwebrequest calling
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Jun 30, 2010
vbnet
Public Class zWrapper
#Region " Variable Declaration "
Private _AllowRedirects = True, _UseGZIP As Boolean = True
[Code]....
It works fine for GET requests, but when I try a POST, it errors: Quote:
A first chance exception of type 'System.NullReferenceException' occurred in WindowsApplication1.exe
Request Error: Object reference not set to an instance of an object.
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Dec 9, 2010
I'd like to be able to set a HttpWebRequest to read teh contents of a text file located on a website (ive seen it done, they use a webrequest and set it to a string, but i can't find it anymore o.O)
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Apr 16, 2012
CODE:
That code works to read the entry data and to recognise the correct data, and the incorrect. However, even if entry is correct, the error msgbox will appear (x times of how many records there are in file), despite being navigated to the menu. Anyway that the Else isn't triggered when data is correct. Also for it to appear just one instead of (x times of how many records there are in file.)
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Aug 5, 2011
I m using proxy in httpwebrequest
[Code]...
But i m unable to check any outgoing connection from my application in fiddler how i can check what request my application sent to server if i m using proxy
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Jun 16, 2012
It is a word scrambler in which the user must guess the word that is scrambled. It is not completed obviously but the code only works with one form. As soon as I include other forms for title screens and the likes, the code doesn't work at all.Here it is (This is the multiform version):
Imports System.Text
Public Class Form3
Public word As New List(Of String)
[code]...
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Nov 23, 2010
I have a program that uses the mouse to find window captions. I made a test program that just does that and it works fine. I copied and pasted the code into my other program and it doesn't work. The mouse position changes, but it will only get the caption of a window if it is at the top of the screen. It seems that only the Mouse.X position is changing, but I put the MousePosition.X and Y in a label and they are both changing. Can anyone explain why this is happening?
[Code]...
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Oct 26, 2011
vb
<System.Runtime.InteropServices.DllImport("user32.dll")> _
Private Shared Function GetAsyncKeyState(ByVal vkey As System.Windows.Forms.Keys) As Short
End Function
[code]....
I run the debugger and hit the P key the programs hides, but when i go to hit L key i hear a bing and nothing happens.
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Jan 2, 2012
Taking the following
vb.net
Dim ImageMagick As String = ""
Dim convert As String = ""
Dim mogrify As String = ""
[Code]...
When I run it, it works because I have MsgBox() in there (at the end of the script). As soon as I remove MsgBox() it stops working properly, why?
What it should do: When the program loads, it will call my sub, the sub will check to see if the two files exist, if they don't exist a folder dialog box is opened and you select the folder that they are in, it will then call it's self again and do the same thing. If the files do exist it should continue with the program.
The Problem is, that it only works the way I want when I have the MsgBox() function there otherwise it only works if you select the correct folder the first time the dialog pops up.
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Nov 4, 2010
I have an app that moves the mouse, and does a click on the screen however, it seems to work great on windows XP machines, and when i try it on my windows 7 box, the window dosent close, or do anything..
I typically will hit my "execute" button, that will minize the window, then i place my cursor where i want it to go, and hit space bar, and it should move my mouse up a few spaces, click, and move to the next.. But again, winXP it works fine, win7 dosent do anything.
Imports System.ComponentModel
Imports System.Runtime.InteropServices
Public Class Form1
[Code].....
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Dec 2, 2010
There shouldn't be any problem whatsoever right?
VBScript_RegExp_55.RegExp
and
VBScript_RegExp_55.MatchCollection is gone
VBScript_RegExp_55 name space is still around but only contain interface globalObj and errObj.
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Jan 25, 2011
I'm trying to make a email client but my biggest problem is finding a component that is (preferably) free. I need one that works with IMAP and POP3. Also would be nice if it could handle sending emails (Via SMTP). It would also be great if it worked with gmail.
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Jul 18, 2010
need to know exactly how does the API functions Read/Whrite Process works. I'm so confused while working. I know that I have to work using something like sectors. But I don't know how. Can someone give me an example. I dont know hoe to do it. for an example, for you to give me. Create a basic programa with a button and a textbox the button searchs what is in the textbox in a process memory. Search the title of a program for example.
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Oct 20, 2010
I am running a website for a F1 racing game, where users can submit their laptimes and compete with each other for the fastest time.
I am now trying to have my website create an image of the top-5 users every... 5 minutes or something, and copy it to the webserver somewhere I can link to. This way the image under that link will update with the latest information every 5 minutes.
To layout the times (these also include the position (1 to 5), the username, the platform, the time of course, and some more details) I am using a DataGridView. I could take the long route and layout the specific 'columns' manually, but I thought using a grid was far easier. I simply set some properties of the grid to make it look nothing like a grid (basically hide the column and row headers and grid lines and give everything the same backcolor). Then I load the times into the grid, and take an image of it using the Control.DrawToBitmap method.
This works fine, but it returns the entire grid. This is a problem because I made the grid extremely large (5000x5000) so that it can always accommodate the times regardless of the length of the usernames. So, the image I get is 5000 pixels wide while it only contains data in the first 500 px orso.
I am currently using the GetRowDisplayRectangle and GetColumnDisplayRectangle methods to figure out the part of the grid that actually displays the times, and use that to cut the image down to the portion I need.
But here's a problem: these methods only return something when the grid is on a form that is currently being shown! I am already giving the grid a parent form (even though I am just creating it in memory and it doesn't need to be displayed anywhere) because otherwise the data wouldn't load, but I was never showing that form. Now it turns out I do need to show the form, very briefly, in order to figure out the area that I need to take a snapshot from.
Remember that this is all happening on a webserver, so I'm not absolutely sure if this is a problem. Is it ok for a webserver to have a form popping up and down every 5 minutes? Or will this cause problems? I honestly don't know but I don't think it's a good thing. Moreover, it also pops up on my own machine when I'm testing, and it's damn annoying.
So my question is basically twofold:
1. Maybe I should ask this in the ASP.NET forum, but is it a problem to show a form briefly every 5 minutes?
2. Is there any other way to get these Get...DisplayRectangle methods to work without having the grid on a physically visible form?
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Mar 5, 2012
I have a code keypress that automatically input a text in a particular textbox if the text i pressed match the fields.eg. when I type 32 in the ID textbox . The name of the person whos ID is 32 will be put on the name text.it works perfectly but when I use autocomplete on the textbox it will not work anymore. is their a way or can anyone tell me why it isnt working.?
Private Sub txtTicketPassengerNo_KeyPress(ByVal sender As System.Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles txtTicketPassengerNo.KeyPress
If e.KeyChar = Chr(Keys.Enter) And Me.txtTicketPassengerNo.Text <> Nothing Then
[code].....
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Feb 27, 2012
I am not stuck with the code side but rather what seems an issue when using VB and creating well verifying an Twitter Account. I have tried to explain as best as possible but please ask if you need more info
I am currently well on the way to finishing my Twitter Account Creator which also verifies and completes the profile fields but I have encountered a problem and for once not a problem relating to the code side of things at least I don't think it is.
At the moment for testing reasons I have 2 buttons one which creates the account and a second which verifies the account now I am using incognitomail.com (temp email provider) and have 2 web browsers running within my VB program. 1 is for Twitter and 1 is for Incognitomail.com I have no problems clicking and navigating to the verify link and then logging in to verify the Twitter Account but it never verifies and I cannot figure out why.
Say I put another text box and used it to navigate to url's on web browser 1 (twitter) and copied the verify link and put it in the text box it navigates I login and its the fine the account is verified but if I set VB to navigate (can't click because it opens in IE and not within the VB web browser) to the verify link it never verifies I have even tried making the text box fill and then navigate via that just as if a human was doing it but still no luck.
Does anyone have any idea as to why these Twitter Accounts are not verifying when the VB program performs the navigating to the verify link then login but if I do it myself i.e copy the verify link put it in the text box which navigates the web browser then it verifies fine?This is the one step standing in the way from my program being about to create and verify accounts and will not cost a fortune as this was a personal project to counter the lack of Twitter Creators which both work fully and are cheap.
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