Determine If URL Exists Without Requesting The File?
Jan 25, 2010
I would like to check if a URL exists -- without requesting the file. The program needs to check if a PDF or Excel spreadsheet exists at a particular URL. If it does, it might want to download the file, but it should not download it every time.
I currently use the WebBrowser.Navigate method to do this, but it always downloads the file. But I don't want to actually download the .pdf or .xls file, I just want to determine if the URL exists.
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Aug 9, 2010
I'm using the coding below to determin if a certain file exists on the hdd. However there is an error on this line: If FileExists("C:myfile.txt"))="False" then msgbox "False"
it gives me the following error message:End of statement expected.
what am I doing wrong?
[Code]...
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Aug 27, 2010
Below is the code that is adding a toolstripmenuitem at runtime. I do need to check elsewhere to see if it exists. What I have below is incorrect. How would I change the conditional check below?
ToolStripMenuItemFile.DropDownItems.Add("Save")
ToolStripMenuItemFile.DropDownItems(2).Click += New EventHandler(SaveFile_Click)
If ToolStripMenuItemFile.DropDownItems(2) IsNot Nothing Then
ToolStripMenuItemFile.DropDownItems(2).Text = rm.GetString("Save")
End If
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May 23, 2012
Is there a way to determine if a Printer exists?I want to warn my users that a printer doesn't exist before they send reports to print.
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Nov 14, 2008
I have a function in VS2008 VB.NET that creates a dataset and reads field values from that were loaded from a SQL Server 2008 database tables. The tables are from varied sources and in some cases particular column/field names are different. Some use a long name; others use a short name. I need to determine whether a short name or a long name is being used.Pseudo code:If row("ShortName") Exists then ReadDataFrom r("ShortName").ToStringElse ReadDataFrom r("LongName").ToStringEnd If
How would I determine if a particular column name exist in a dataset or datarow?
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Jan 7, 2009
I wanted to create a login system that would have 3 tabs 1 for regular login, 1 for admin login and 1 for account creation. So far so good. It saves the accounts by saving them in a .urs file in the map called /Users/. However when this map does not exist it will show a error. I would want to know what code or so to put into the form_load which will make my program create the map /Users/ if it does not exist. As im not familiar with all the codes and stuff. The only thing i can come up with is
Mkdir "/Users/"
but then ofcourse it would create the folder users everytime i start the program. not i was still "Hello Worlding" a few days ago, so i really am unfamiliar with any sort of high-skilled programming which i probably dont understand.
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Jan 10, 2010
Im just trying to determine if a website exists when i navigate my webbrowser. via messagebox.Ive tried this so far but it wont work:
Private Sub WebBrowser1_DocumentCompleted(ByVal sender As System.Object, ByVal e As System.Windows.Forms.WebBrowserDocumentCompletedEventArgs) Handles WebBrowser1.DocumentCompleted
If WebBrowser1.DocumentText.Contains("Action canceled") Then
[code]....
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Feb 15, 2010
I am trying to create a function that will determine if a worksheet within the active workbook exits. I have searched many web sites without any luck. Here is the coding I have currently:
HTML
Function SheetExists(ByVal sheetname As String) As Boolean
Dim oWorkbook As Excel.Workbooks
[Code]....
It errors out at Dim oWorksheet As Excel.Worksheet = oWorkbook.Sheets(sheetname).
The error message I am getting is "Object variable or With block variable not set."
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Feb 17, 2010
I have the name of a form in a string variable, e.g. "frmOptions". I want to:
1) get the fully qualified name of the form
2) determine if the form exists in the application
3) create an instance of the form
4) show the form
I know that using reflection I can do #3 this way, but I need to get the fully qualified form name first[code]...
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Apr 27, 2012
I am working with LINQ to XML in VB (although answers in C# are great, too). First off- my code works, so this is not critical. However, I can't help but think that what I'm doing with conditional logic should already be doable using the LINQ query itself. Here's what I've got:
'Get the Description elements in the ResultData section where the value is "Op Code"
Dim opCodes As List(Of XElement) = (From c In xdoc.Descendants("ResultData").Descendants("Description")
Where c.Value = "Op Code"[code].....
Please don't be too critical of my method of locating the sibling nodes- the XML files are produced by a third-party testing device and this is the only generic way to get the values I need. What I'm really looking for here is a better way to handle the If block.
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May 9, 2009
Just like the title says, I have a webbrowser and I need to determine if the element exists or not before I invoke it.
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May 10, 2010
How can I request permissions to use My.Computer.FileSystem.SpecialDirectories.MyDocuments for writing?
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Jan 10, 2012
I want to add a control in winforms that drops like combo box but can show data like datagridview. I have seen this control in an application but not able to find a way how to do it. (Pic attached)
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May 22, 2012
I am trying to get the id from a url and send it to the client side this is what I did. This is my url : [URL]
Code behind
Public Partial Class Edit
Inherits System.Web.UI.Page
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
End Sub
Private _myId As String = Request.QueryString("id")
Public Property myId() As String
[Code] .....
Error
Request is not available in this context
This is also what I get when I move the private prop to page_load()
"private " is not valid on local variable declaration -
Here is the answer
Public Partial Class Edit
Inherits System.Web.UI.Page
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
MyIdVal = Request.QueryString("id")
End Sub
Private _myIdVal As String
Public Property MyIdVal() As String
[Code] .....
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Apr 4, 2009
I'm creating a VB program to run a psychology experiment and I'm pretty close to done but am running into a few problems. The experiment consists of 8 phases that display on a single form but with different stimuli (pictures and text) being displayed on the form. So for example, at the top of the form would appear "dog" and below that in the center of the screen would appear the word "cat" and then the subject would select one of two option buttons, one being on the bottom left of the screen and one being on the bottom right of the screen.
One option button is labeled "Similar" and the other is labeled "Opposite". I also have corrective feedback displayed after each choice is made. Here are the things I have not figured out
[Code]...
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Aug 7, 2009
I want to make a simple application on Windows XP with a single button which says "Help" - that will launch Windows Messenger's Remote Assistance and connect to my MSN Messenger ID - this is detailed here: [URL]. This is for my Dad or Mom who sometimes get confused when the Firefox UI resets itself or something other similarly catastrophic happens. I am familiar with the Windows programming model but am unsure on how to go about it - I would like to do this in C# or even VB.net.
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Sep 6, 2011
For those that are having problems using VB with other technologies or finding samples/content or requesting new VB Language features then there is another way to provide this feedback to Microsoft so that we can work to provide useful content.[URL]..These posts will be actively monitored by Microsoft product team members who are interested to hear from developers.
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Sep 13, 2011
I've created an executable that's called by another app for processes that require UAC elevated privileges. If I build this project with the below manifest it requests UAC fine, if I add this projects output to my setup project it creates it without UAC?[code]....
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Jun 27, 2011
First good Monday to all and thanks for the suggestions on path I got it working somewhat.Problem: When a user clicks the comment button I would like outlook client to open so they can submit their comments. We run outlook client 2010 and exchange 2010 server. The Network Administrator is somewhat helpful but I am responsible for coding. Code specifics needed, did some research but not a lot of examples. I originally designed a cute little form with pages that folks could view to answer questions about how to use office software, the boss saw it and now they want more.
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Sep 5, 2011
Public Class Form2 Private Sub TextBox1_Click(sender As Object, e As System.EventArgs) Handles TextBox1.Click
OpenFileDialog1.FileName = Nothing
OpenFileDialog1.ShowDialog()
If Not OpenFileDialog1.FileName = Nothing Then
TextBox1.Text = OpenFileDialog1.FileName
[Code]...
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Nov 15, 2010
Here's my code: System.IO.File.Move(Form6.OpenFileDialog1.FileName, "Temp") I'm trying to make it so that the program copies the file that you select in the OpenFileDialog and moves it into the "Temp" folder. It gives me an error saying: Cannot create file when file already exists.
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Mar 7, 2012
I am trying to write(what I thought would be a simple piece of code. I was wrong.
What I am trying to do is to get an application to check if a file exists, However, I have it wrong as the file obviously does exists, but when I run the application it tells me it does not.
Imports System.IO
Public Class check
Dim checkfile As New FileInfo("C:\HelloWorld")
[Code].....
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Jan 26, 2009
im trying to make code to check if a file with the same name exists twice in the same dir one with .dds and one with .veh file extentions and if they do put in a listbox but if only one exists then it puts it in another listbox i have made code to filter .dds in to one listbox and .veh in another but i dont know how to make the "check" if they are both there
this is the code i have to split them at the mo
For Each files In dir
Dim path() As String = files.Split("\")
Dim chunk As Integer = path.Length
[Code]....
but i wanted the Else for the .dds files that dont have the matching .veh file
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Oct 24, 2006
OK, hi. what i'm trying to do is ultimately detect wheather a word doc exists. I don't want to open it.hat it's going to do is detect if the file exists.
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Feb 2, 2011
Have only just started trying Visual Basic after using Delphi almost ever since it first came out. How on earth do I see if a file exists? - simple terms please
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Apr 17, 2012
I have the following
If Dir("C:Test.txt") <> "" Then TextBox1.Text = "File exists" Else TextBox1.Text = "File does not exist"
End If However, I'd like to use this alongside a DataGridView.
Basically, when the application runs, the user selects a folder for file storage. Then, in the DataGridView, the contents in each cell of Column 1 become the file name. In short, the contents of a cell, plus the selected folder for file storage, becomes a whole file path.I need to use the above code to get my application to check if the file exists, and if it does, it should place the text "File Exists" in column 2 of the DGV.
I can't work out a way for the DGV to be "continually aware" if files have been created and so to update automatically without the user having to press buttons etc. As soon as the file exists, the correct text should be placed in Column2.
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Jun 7, 2011
In my vb.net winform application, I am moving the file (ex: sample.xls from one folder to another. If file already exists with the same name, the new file name should be incremented (ex:sample(1).xls). How can i acheive this?
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Dec 22, 2010
I have a method which tests for the existence of a file prior to carrying out some manipulation of file content as follows:
[Code]...
The idea is that if the file does not exist, then the file is generated by calls to the NLog logger instance, at which point the file is created and the specified header info is inserted. The method works fine from the application itself, however I have a simple NUnit test which implements a test method to verify that the file is created and populated as expected. When I step through with the debugger, I find that '_logPath' is set to:
D:Documents and SettingsTE602510Local SettingsTemp
unit20ShadowCopyCache4288_634286300896838506Tests_-1937845265assemblydl37cdfe61aaa18c98d_f0a1cb01logs2010-12-22.log
Unfortunately, despite the fact that the file DOES exist, the call to File.Exists returns false. From earlier viewing of the config path the above path would appear to be correct for these NUnit tests. Does anybody have a clue what is happening here and what I need to do to get the desired result? The pathname to the log file as per the XP file system is:D:Documents and SettingsTE602510My Documents_VSSWorkAreaPsalertsIpTestsinDebuglogs
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Nov 28, 2011
What is the easiest want to check if a .dll file exists, then to load it ? ( i don't need to use modules from that dll file, i just want to run it ).
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Dec 8, 2011
How do I check if any file exists in a folder.
If found I want to delete it.
I can check for a specific file:
If System.IO.File.Exists("C:Labs" & "Lab0.txt") = True Then
msgbox "Files Found"
else-------------> I want to Delete it End If
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