Fixed String With Embedded Null Characters

Mar 26, 2010

I am using a com object to maniplate data inside an external program using VB.NET. One of the methods this com object provides requires 1 string parameter.The external program, however, requires a sting of a specified length, regardless of the number of characters used. The string to be passed to the function (length 36) is a combination of the below key fields.[code]I have tried the VB6 compatability's VBFixedString type but the com object's method throws an exception due to a type mismatch.If I convert the VBFixedString back to a .NET string before passing it to the method, the first null character is again interpreted as a string terminator and the rest of my string is chopped.

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Format A String In A Fixed Number Of Characters?

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I need to format a string in a fixed number of characters.

For example, if someone type TWO

It has too save in the variable

000TWO

if type THREE

0THREE

Always 6 characters and fill the rest with zeros on the left.

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I have a long string like this

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And I want to split it into a string array. Each element of the array should be in 3 characters length[code]...

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I need to create a console program that allows you to enter a string, of which is then outputted in reverse.

Sample:
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Error When Getting A Substring Of X Characters Out Of A Parent String Of Less Than X Characters?

Feb 23, 2011

Not sure if too many people know this, but the following line will cause an error:

GroupName.Substring(0, 3) = "jt_"

....if the length of GroupName is less than 3 characters. I always thought it would simply return whatever characters in GroupName, but no, it errors. I must be thinking of the old VB6 days.So, I now have to change the code to:

If (GroupName.Length > 2) Then
If (GroupName.Substring(0, 3) = "jt_") Then

Note that the two comparisons need to be on separate lines. If they are on the same line, such as:

If (GroupName.Length > 2) and (GroupName.Substring(0, 3) = "jt_") Then then the code will still fail as the length command is executed at the same time as the substring command- which will cause the error when the GroupName length is less than 3.Just thought that those of us not aware of this should be!

dp.SyntaxHighlighter.ClipboardSwf = '/dp.SyntaxHighlighter/Scripts/clipboard.swf'
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dp.SyntaxHighlighter.HighlightAll('f6d554fd98464bdba9159b319e51b381')
dp.SyntaxHighlighter.HighlightAll('93bf4ca63ad8447abdf084d8a9991e15')

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Private Function GetByteArray(ByVal MyArray As System.Array, ByVal Start As Integer, ByVal Length As Integer) As Byte()

[Code]...

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Aug 13, 2010

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I have files that are one long line of text but are made up of individual segments. I have managed to parse the segments into a string array but now need to parse each segment into its individual fields, based upon a field structure defined by the first 2 characters of the segment.For example:

CA12345ABC999999XXPPPPPPPP55
CA segment (CA is first 2 characters of segment) has fields defined as:
Field Name,Start,Length

[code]....

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Feb 21, 2010

How do i Declare a string like this:

Dim strBuff As String * 256

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Aug 1, 2011

I am trying to format a string of arbitrary length into a fixed width field for display.

Let's use a width of 20 as an example, and call the string to be formatted s. I'm adding the formatted string to a StringBuilder named b.

Dim b As New System.Text.StringBuilder()
Dim s as New String

If the string I want to display is shorter than 20 characters, I can do this:

b.Append(s.PadRight(20))

or

b.AppendFormat("{0,-20}", s)

So far, so good. But, if the string is longer than 20 characters, I want the string to be truncated to 20 characters as it is appended. The code above appends the entire string.

I tried this:

b.Append(s.Substring(0,20).PadRight(20))

But, this fires an exception if the string was shorter than 20 characters.

So, I ended up with:

b.Append(s.PadRight(20).Substring(0,20))

This seems to do the job. The PadRight prevents the exception by making sure thet string has 20 characters before the Substring is performed.

I was wondering if there is an alternate method that would look more elegant and avoid padding the string just so prevent the substring from causing an exception. Have I missed a feature of String.Format that can accomplish this in one step?

Edited to add solution:

I ended up with the following code:

Module Extensions
<Extension()> _
Function AppendFixed(ByVal b As StringBuilder, ByVal s As String, ByVal width As Integer) As StringBuilder

[Code]....

This uses an extension method to clean up the syntax, as suggested by Joel and Merlyn, and uses the StringBulider Append overloads to avoid creating new strings that will have to be garbage collected, as suggested by supercat.

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If generatedUserName.Length < 7 Then
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[Code].....

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just say I have a string as follows:

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Peter
Imports System.IO
Imports System.Reflection
Dim oEmbed As Object

[Code]...

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dim x as string
dim y as string
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y = x.Split(">" , " ")
MsgBox(y.Join(""))

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Further along the program I have this line of [code]...

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[Code]...

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