How To Check If Theres A Specific Char Within A String

Nov 10, 2008

my question is how can i check a string for a specific char (for example, in the string:"242.421" theres the char "." how can i make a rule so that char can only be typed once... (in a textbox) so when a user click the "." button on their keyboard it won't allow it again (more than once)

View 5 Replies


ADVERTISEMENT

File I/O And Registry :: Read Char By Char From A String?

Dec 16, 2008

i want to read a character 1 by 1 from a string and a .txt, i know all about stream reader so for the .txt would it be somthing like:textbox1.text = tr.readCharacter.i would prefer to be able to read from a textbox or String array though.

View 10 Replies

Validate String To Have No Space Char And Only First And Last Char As Delimeter

Mar 30, 2012

I need validation for string to comply with next: no space char starts with one delimiter char ends with one delimiter char has no other char as delimiter char. Updated sorry missed that should only be one delimiter char at start and at the end

View 2 Replies

Check For Specific Value Of A String

Sep 16, 2009

any method that can check for specific value of a string whether it exists in the string and if it does then that whole string will be captured with that specific text.

View 15 Replies

Copy The Value From String To Char Array Using String.CopyTo() Method?

Jul 13, 2010

I am trying to the copy the value from string to char array using String.CopyTo() method.

Here's my code

Dim strString As String = "Hello World!"
Dim strCopy(12) As Char
strString.CopyTo(0, strCopy, 0, 12)

[code]....

Edit : I get the this error at runtime.ArgumentOutOfRangeException Index and count must refer to a location within the string. Parameter name: sourceIndex

View 2 Replies

Search Data From Database With Some Check Box And Text Box When User Select Check Box Specific Function

Dec 15, 2011

My application is like this : i have to search my data from database with some check box and text box when user select check box specific function go on and then when user enters some range of value in textbox then the result will shown in data grid view after that i can print it by selecting data
my vb.net code is as follow:

Imports System.Data
Imports System.Data.SqlClient

Public Class XtraForm1

[CODE]............

I m also pasting the demo picture.

View 2 Replies

Check Specific Pixels In A Picturebox To Check The Color?

Jan 17, 2010

Is there a way to check specific pixels in a picturebox to check the color? Basically what I have is a black square with some white dots, and I want to find the position's in the picture of the white dots.

View 2 Replies

.net String To Char In C?

Jul 14, 2011

I have a DLL that I am importing:Declare Function QueryInfo Lib "mydllname" (ByVal DevName As String, ByVal pcQueryParam As String, ByVal Result As String, ByVal Length As Int32) As Int32

[Code]...

Anyone have an idea what the issue could be? If I run similar code in VB6 (only diff is mtStatus = String(mtValueSize, Chr$(0)) ) it returns what I expect.

View 7 Replies

Why Is String Returning A Char

Jun 27, 2012

I have built a DataTable from my database. Then I am looping through the rows and trying to access a string, however the value is being returned as each character in the string.

For Each theseRows In DisplayForm.MainTab.Rows
If theseRows.Item("Last_Name") = userLast And theseRows.Item("First_Name") = userFirst Then

[Code]....

The Trap_Code values are two or three letter strings, the returned value is each letter once at a time. The loop seems to cycle through the individual characters of the string as an array rather than display the entire value, which is what I was hoping for.

View 2 Replies

Asp.net - Remove Last Two String Char?

Aug 24, 2009

The following code:

If checkboxList.Items(i).Selected Then
.Fields("DESC1").Value += checkboxList.Items(i).Text + ", "
End If

should produce output such as "A, B, C,(space)", which will then be bound to a dynamically created GridView. I would like to remove the last two-char string, that is ",(space)". How can I do this?

View 10 Replies

Convert String To Char?

Jun 5, 2011

I am writing a database and need to post a value in a lable to a sql field.the sql datatype is set to money.when posting i have

CMD.Parameters.addwithValue("@Claim", LBCLAIM.text)

when posting i gett an error

cannot convert a char vaule to money. the char vaule has incorrect syntax.

View 1 Replies

Cut The 1st 3 Char In A String With Vb 2008?

Apr 29, 2009

how can I cut the 1st 3 char in a string in vb 2008?

For example:
Dim i As String = "ABCDEF";

I want to only cut the 1st 3 char and the system will only display "ABC" after the 'cut' action done.

View 3 Replies

How To Convert String To Char

May 27, 2012

I want to convert say Input: textbox1.text=blabla Output: blabla becomes into: textbox2.text=(char45 & char34 char45 & char34 char45 & char64 )

[code]...

View 1 Replies

Move First Char In String To The End?

Apr 28, 2011

Im wanting to create a function that receives a string and moves the first letter to the end and returns it.

Public Function moveLetters(ByRef word As String) As String
Dim length As Integer = word.Length
Dim chars(length) As Char

[code]....

View 3 Replies

Remove Char From String?

Oct 29, 2008

what is the best way to remove FileFinder1 from this string:

"C:Program FilesFileFinder1"

View 1 Replies

Using Char - First Letter Of String Must Be Certain

Apr 18, 2010

Basically the first letter of a string must be a certain letter. At the moment the only way I know how to do it is as follows:
If sConsignmentNo(0) = "J" Or sConsignmentNo(0) = "C" Or sConsignmentNo(0) = "U" Or sConsignmentNo(0) = "N" Or sConsignmentNo(0) = "H" Or sConsignmentNo(0) = "S" Or sConsignmentNo(0) = "V" Then
Basically listening the same thing out over and over. Is there a way I can say, If sConsignmentNo(0) = ListOfValidEntries i.e J,C,U,N etc?
Using Visual Basic 2008 and cant use regex!

View 15 Replies

Import And Call Unmanaged C Dll With Ansi String "char *" Pointer String From .net?

Mar 11, 2010

I have written my own function, which in C would be declared like this, using standard Win32 calling conventions:int Thing( char * command, char * buffer, int * BufSize);I have the following amount of VB figured out, which should import the dll and call this function, wrapping it up to make it easy to call Thing("CommandHere",GetDataBackHere).UPDATE:This code is now a working solution, as shown here:

Imports Microsoft.VisualBasic
Imports System.Runtime.InteropServices
Imports System
Imports System.Text

[Code]...

Updates: I got the code to build by following the help received here, and then I had forgot the As Return Type (which got me a MarshalDirectiveException PInvokeRestriction). Then I had an assertion failure inside my DLL, which lead to an SEHException. Once fixed, this works BEAUTIFULLY. There are newsgroups where people are saying this can not be done, that VB only loads managed dll assemblies (which I guess is the normal thing most VB users are used to).

View 2 Replies

Converting A String To A Char Array?

Mar 23, 2012

I have a string like this.

Dim str As String = "code"

I need to break this string down to an array of characters like this,

{"c", "o", "d", "e"}

How can I do this?

View 3 Replies

Find The Index Of A Char In String?

Aug 20, 2011

I have a string that goes like "abcdefg..."

I would like to find the index where the letter d is at, so I can get the number 3.

I managed to do it by looping through each letter in the string, but that doesn't sound very convenient.

View 4 Replies

Function To Test First Char Of String?

Jan 15, 2012

Function to test first char of string

View 9 Replies

Replace A Char From String At Specified Position?

Apr 29, 2011

Hello all, im now trying to create a way to replace the last char of a string with "4"[code]....

View 7 Replies

Replace Char At Specified Index Of String?

Dec 1, 2009

I want to replace a char at a specified index of a string.

Short of using the .Remove and .Insert methods I was wondering if there is an easier way.[code]...

View 6 Replies

Splitting String With Array Of Char

Jun 14, 2011

I want to split a string with this array of char
Dim sepa As String = " '"",.;:(){}[]·#|-_<>+¿?=/&%$‚¬@!¡"
The question is how do I include in this string vbcrlf? So I can do the fallowing:
dim palabras as String() = RichTextBox1.Text.ToString().Split(sepa)

I tried:
Dim sepa As String = " '"",.;:(){}[]·#|-_<>+¿?=/&%$‚¬@!¡\r\n"
But it does not work.

View 5 Replies

String / Char Arrays And Whitespace

Feb 6, 2012

I am developping an app which talks across a network and will eventually be used to read in a text file (on the client) and transfer it to the server. Currently, the server and client succesfully connect to each other using the Tcplistener/Tcpclient classes. I am now trying to send some data across the network using the networkstream class, which I have implemented.Currently for testing purposes i am sending a char array which contains the characters "hello" which succesfully sends and outputs to console on the server. Although, "hello" is followed by a long list of whitespaces. I have tried converting this to a string array on the server and/or client and using the string.Trim() function (amongst trying many other things over the past couple of hours) although the output remains the same.

View 19 Replies

String Char Strange Appearance In XML

Feb 17, 2011

Why when I wrote in a xml the char "&" it appears &amp; ??

View 3 Replies

VS 2010 Way To Insert Char Into String?

Feb 24, 2011

I have string that is equal to 112233. I need to insert "-" after every second char in string so i wrote the

Dim str1 As String = "112233"
Dim str2 As String = ""
Dim i As Integer

[code].....

View 5 Replies

Count Occurance Of A Specific Number & Specific String In Text File Using Vb8?

Dec 13, 2010

i am a beginner in vb8 i have a text file named alarm.txt,sample alarm.txt file is shown below

can someone help me to read the alarm.txt file and extract data.for eg

[Code]...

View 1 Replies

.net - Count The Number Of Occurrences Of A Char In A String?

Mar 30, 2012

Count specific character occurances in string

I have a delimeter in string that i have to validate. How can I count occurrences of that char. For now i have a next function.

Private Shared Function CountChars(ByVal value As String) As Integer
Dim count = 0
For Each c As Char In value

[Code].....

View 3 Replies

C# - Built-in Function To Repeat String Or Char In .net?

Nov 6, 2010

Best way to repeat a character in C#

I wonder if there is a function that returns x times of given char or string. Or I must code it?

View 3 Replies

C# - Extract Char By Sequence In A String Vb 2010

Dec 24, 2010

I have a text in richtextbox1, i want to extract each 3 char of the string and so on, like:

[Code]....

How can i do it ? Code can be in C# 2010 i will translate to vb.net 2010

View 1 Replies







Copyrights 2005-15 www.BigResource.com, All rights reserved