.net - Using Instr When String Is Nothing
Jul 29, 2009
I have the following condition
If InStr("a,b,c", stringA) > 0 OrElse (InStr("y,z", stringB) > 0 AndAlso value = 0) Then
endif
COndition 1 is false so i check for condition 2 that is "(InStr("y,z", stringB) > 0 AndAlso value = 0) "
What puzzles me is that when stringB is nothing it still falls into the if condition and executes the code.
On first look it would seem that when stringB is nothing condition2 would fail and as a result would not fall into the if condition.
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Aug 16, 2011
Is it possible to use a string for string 2? cuz whenever i tried it would return a 0 instead of the position of the string. however when i hard code the string into the code it works
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Jan 21, 2011
What i am trying to do is take a character (which is going to be into a variable by user input) and search a string for this character, and save the positions of all character found and then change the same position of these characters in another string for the character that the user inputs. In other words, like a guess a word game. User tryes a guess, i search the string for that letter or number, if it's there replace it on the text box of the GUi, if not save it in another variable as a character that has been tried already, possibly an array.
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Aug 7, 2009
I have an application in VB.NET which gets string data from the database. This string has data which looks as below:
"This is the update: I have an issue with the application"
I need only part of the data, that comes after the new line i.e. "I have an issue with the application".
For this I am trying to search the position using InStr where the string has data in a new line. I tried many options, but they don't work.
I used "vbCrLf", Chr(13), "
", "
", "<br/>", Environment.NewLine, but none of them work.
How can I get the data I need?
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Oct 23, 2009
i have a string that looks like this "Patient Name, Doc Name, Patient ID, something else"i want to extract each one of these and put it in a variable. such that var1 will equal "Patient Name" var2 will equal "Doc name" etc.. using instr and mid. what is the best way to do it?
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Dec 8, 2009
for determining whether a string of data contains certain text, which is more efficient? I have read elsewhere that there is somewhat of a consensus to avoid legacy functions, since they may or may not be available in future versions.However, trying to use the contains method (or indexof equivalent of Instr) is causing me problems, I think, because I am having trouble performing a case-insensitive search.
I am trying to be efficient and functional in my code. I am reading an INI file, and I have preloaded the contents of the file into a String variable, for 2 reasons. 1) If I can test if a certain section exists in the code, I can avoid attempting to read a section of empty data (the INI reader class I have chosen returns the value or an empty string for a given request). More importantly, 2) I have created a data field that is not INI compliant (at least not to the API?) as it is a data field that can contain an arbitrary (unlimited?) amount of data which is a hex-encoded representation of serialized byte data. I need to be able to determine if this value exists in the file and retrieve it using normal string manipulation, since the INI handler will not pass strings longer than 256Chr.
So, the problem I am having is getting "strFileContents.Contains("data=")" to return true in the case where the file contains "Data=". This could be data=, DATA=, DaTa=, etc.Instr has the option "CompareMethod.Text" which, I believe, does a case insensitive text search. What is the equivalent for "Contains"?
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Mar 12, 2009
I am developing a twitter application. I can add, delete a user but now need to load the users follower page and then add the followers. the problem is the element id's are all different. I have tried the following,, loading the html into a text box and trying to read it using instr. but could not get the instr to parse the element id which looks something like this
[Code]....
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Jan 13, 2011
I'm looking to do is scrub an html file for anything that resembles an IP address or any set of numbers for that matter. Normally what I would do is just using things like string.split to split out the html around areas that I want to search. What I am looking to do is be able to essentially search a large amount of characters for anything that matches this reg ex pattern.
Dim pattern As String = "^(d{1,2}|1dd|2[0-4]d|25[0-5]).(d{1,2}|1dd|2[0-4]d|25[0-5]).(d{1,2}|1dd|2[0-4]d|25[0-5]).(d{1,2}|1dd|2[0-4]d|25[0-5]):(d{1,4}|[0-5]dddd|[0-5]dddd|6[0-4]ddd|65[0-4]dd|655[0-2]d|6553[0-5])$"
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Oct 24, 2010
'InStr' is a namespace and cannot be used as an expression.Dim FirstString As String = "me@me.com"
Dim SecondString As String = "@"Dim position As Integer position = InStr(FirstString, SecondString)
If position = 0 Then MsgBox("Not a Valid email address: There was No @ Sign") End If
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Sep 28, 2009
I come from a C# background but am now working mostly with VB.Net. It seems to me that the above functions (and others - eg. UCase, LCase) etc. are carryovers from VB6 and before. Is the use of these functions frowned upon in VB.Net, or does it purely come down to personal preference?
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Jan 30, 2010
I am creating a movie player which lists movie files from various folders/subfolders in a combobox (tsFileList). I'd like to be able to enter the movie name into a textbox (txtSearch), find that text in the combobox (using instr), then automatically select the found item.I'd like to use instr as some of the items in the combobox contains full file paths.
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Nov 19, 2011
I created a code that allows me to search inside a RichTextBox...Then the code is as follows:[code]Now with the code that I use today, the MsgBox show me only the first, ie "<b> text1 </ b>" while others are not..
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Jun 27, 2011
i try readexisting and instr function as follow:
[code]...
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Jul 21, 2009
I want to assign the value of the integer returned from the InStr method to a variable. So, If TextBox2.Text = "The Apple Pie" And TextBox1.Text = "App", I want the integer returned, which in this case would be 5, put into a variable, lets say its called 'VarString'.
So VarString (would) = 5.
[Code]...
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Aug 1, 2010
I'm using this for a single value to search for.
intPositionOfApartment = InStr(StrConv(pStringToParse, vbUpperCase), "APT") Is it possible to search for more then one value such as "APT", "UNIT" ?
If yes please show me an example of how it should be coded.
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Jan 23, 2011
I'm brand new to visual basic and I've been given an exercise to extract data from a text file. I can get the lines of data to read in and can get the names out using the following code. How can I extract the department i.e. sales and finance also using the mid and instr functions? I also need to be able to list list the people by department using a dropdown combo box.
[Code]...
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Jan 26, 2012
other than GML (Yoyogames.com Game Maker Language), I am new to the coding world. The only "major" project I have completed using VB is a computer calculator that exactly mimics the capabilities of Windows 7's calculator. Yesterday, I began a Chatbot program for my girlfriend. Lol. I have used the instr() function to answer most of the questions or answers which are typed into the textbox1. I find this extremely troublesome because when using the instr() function you cannot say instr(textbox1.
Public Class Form1
Dim fos As String = "Foster: "
Dim ash As String = "Ashley: "
[code].....
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Jan 18, 2011
Can I do anything more or less with IDictionary? How do these two collections differ?
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Mar 11, 2010
my code is :
[Code]...
The error is Value of type '1-dimensional array of string' cannot be converted to 'String'.
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Jul 29, 2011
I want the Function to accept List(Of String), Array & String and similarly return List(Of String), Array & String respectively. The Function simply adds a string (month) to the input collection. I just want to use it for string, array and list with needing to think of conversions.
[Code]...
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Aug 12, 2011
Basically I have a webresponse stream:dim lol as string = readstream.tostring there is a lot of information within the string but only one link starting with http: located near the end of the string - however there is no constant character point where I can start... (i.e. 38)
I want to extract the link from the string i.e. dog cat plane car [URL]..that is approximately how it looks above - words and url substituted I want to just extract [URL]..I had an idea of parsing the string from http: to the end Then after that splitting the string up again to remove the }], however it does not return anything
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Jun 22, 2010
I got an app, which receives data via a R232 port, convert it to a string and on the other side I got a database, where the strings are saved. How can I find a way to compare the string with all strings in one database column and get back the another stringform the same row in this database. I never programmed a database
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Aug 18, 2011
I have buttons generated through code (dynamically). I have to associate an event (the same) to them. I use AddHandler button.click, AddressOf mysub.The issue is that mysub gets a string (mysub(string)), but AddressOf doesn't accept a parameter inside the routine. How can I do this? Using also an alternative to AddressOf.
EDIT:
Public Class Form1
...
Private Sub mysub(ByVal sender As Object, ByVal e As System.EventArgs, ByVal str As String)[code]......
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Dec 5, 2011
These is the content of my txt file which is saved in D drive in my pc abc,1,2,3..I tried the flowing but it didn't work:[code]I am getting error on this line.. data = line.Split(","c)...it says this line isn't in use anymore or something and that I rather use LineInput but thats asks for filenumber and i don't know what that is. I am sorry but I am a complete beginner. what else can I try? [code]ok that error is gone now but now if I want to add these values to a list box..how can i do that?
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Jan 7, 2010
What is the best way to pass the four (4) parameters after the applicationName to the application to be launched?
Process.Start ("C:\MyApp.exe",
"CommChannel1",
"DeviceName",
"Language",
"UserName")
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Jun 23, 2009
I have the following web method:
<WebMethod()> _
<ScriptMethod(ResponseFormat:=ResponseFormat.Json, UseHttpGet:=True, XmlSerializeString:=True)> _
[Code].....
I wanted to use HttpGet here so that the result can be cached.
I tried every variation of calling this, but no luck. Is this possible with GET?
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Apr 5, 2011
I have a field that I display via: String.Format({0:c},amount) This produces the string "$28.28" However, when I try to convert back to a decimal amount, I get an incorrect format exception: amount = Decimal.Parse(amount.Text, NumberStyles.Currency) I also tried it with NumberStyles.AllowCurrencySymbol with the same results. I verified that the value in amount.Text is "$28.28". Am I missing something? Shouldn't these two operations use the same currency symbol and formats?
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Sep 24, 2009
I Ported this code from a code project article in c# called Nscript
heres the code
Base App
Imports System
Imports System.IO
Imports System.Resources
[code]....
Okay Now I only get two errors (I dont know how to solve them)
Error3Class 'BaseApp' must implement 'Sub OnCompilerError(errors() As CompilerError)' for interface 'IScriptManagerCallback'.
And
Error4Class 'ScriptManager' must implement 'Sub CompileAndExecuteFile(file As String, args() As String, callback As IScriptManagerCallback)' for interface 'IScriptManager'.
But What I would also Like to know (as well as how to fix the errors), is would the code work?
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Jun 23, 2011
I need a regular expression that can validate that a string is an alphanumeric comma delimited string.
Examples:
123, 4A67, GGG, 767 would be valid.
12333, 78787&*, GH778 would be invalid
fghkjhfdg8797< would be invalid
This is what I have so far, but isn't quite right: ^(?=.*[a-zA-Z0-9][,]).*$
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Feb 28, 2010
Problem: Your task is to take input from the user in string and give the following options to the user in a menu.
1- Find a String
2- Create sub-string
3- Erase a portion of a sting
4- Replace a word in the string
5- Count number of words and characters in the string without spaces.
6- Capitalize first character of each new sentence and convert the rest
of the characters to lower case.
7- Sort all the words in alphabetical order. (Use Bubble sort algorithm to perform sorting).
To perform all the above mentioned tasks you can only use pointers. Create a function to perform every task.
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