Calling Older VB Dll (possibly Fixed Length String)

Jan 21, 2010

Got a dll from a supplier that I need to call. His declaration is Declaration with Microsoft Visual Basic: [code]Now, the Sting * 20 is clearly not VB.NET, and sure enough it crashes when run - "Attempt to read or write in protected memory" and that leads me to think that there is something with that string definition - or possibly the I_Ref definition which hasn't been defined as fixed length.I've tried <VBFixedString(20)> when defining O_Err, but I have a feeling that it might not be enough when the function declaration is like that (not specifically fixed length). I cannot figure out how to specify this correctly.As a small hmmmm, the above is pasted directly from the suppliers documentation, but that't will never work, as there is a "," missing after I_Range as long... Clearly not something he has pasted from a working program.

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Declare A Fixed Length String?

May 17, 2012

I am having some problems declaring a fixed lenght string in vb.net. I am studying code for using webcam in vb.net, although the code is from vb6 but I am told it works in dot net. Everyting else seems to be working except this line[url]...

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Declare A Fixed-length String In Program?

Feb 21, 2010

How do i Declare a string like this:

Dim strBuff As String * 256

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Generate A String Greater Than A Fixed Length?

Jun 21, 2010

In my application, a string generated its length can varying from 1 to 100 (not using random number algo). But I want if length is less than 7 than need to add integers 1,2,3.. untill its size reach to 7. I implements it using while loop as :

If generatedUserName.Length < 7 Then
Dim count As Int32 = 0
While generatedUserName.Length < 7

[Code].....

Is any other better way such as enbuild function Tostring() with some parameter?

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Split A String Into A Fixed Length String Array?

Sep 11, 2011

I have a long string like this

dim LongString as String = "123abc456def789ghi"

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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Create A Fixed-length Unique String From Another Unique Numerical Value That Is Too Long?

Feb 13, 2012

I am using VB .Net to access the eBay API and store all completed orders in a database. This database is then fed into a proprietary shipping system, which can not handle an order number larger than 20 characters. eBay returns an order number like so 230407279314-680141236013 which is too long. The order number is always 12 numbers a hyphen and 12 more numbers. What I need to do, is turn this (the result can be alpha numerical) into a shorter, unique order key to store in my database alongside the true orderId (so that this can be referenced by the shipping software instead of the actual order number). The reason for the 20 character limit is the barcode algorithm used. Is there any way to achieve this in VB .Net 2010? This number can be anything unique, so long as it does not exist already (even a good uniqueid function would work, but I would have to query the database to make sure it isn't taken)

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Are Arrays Really Fixed Length In ASP.NET 2.0

Jul 14, 2010

If I dim an array to say, 5 elements, should it not fail if I go to add a 6th? I thought this used to require a redim. In .NET 2.0, I have a character array of length = 3. When I populate it from the db, one record had 4 characters in it and it successfully added all 4 characters to the array?

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Check Page For An Url With A Fixed Length?

Oct 29, 2009

I need to check page for an url with a fixed length

Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
AxWindowsMediaPlayer1.uiMode = "none"

[Code]....

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Generating A Unique ID Of Fixed Length

Jun 17, 2010

I don't know if I can do this here...but here goes. I want to generate a unique ID of fixed length The trouble is, the code example I found on the web is in C# (or C maybe) which I know nothing about. I tried a web-based C# to VB.net converter but the result doesn't work so its hard to understand what's going on (especially since I have not worked with bytes either this makes it more difficult).

[Code]...

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How To Read Through A Fixed-Length File

Dec 7, 2005

I've a text file which has some data written. Records have Starting character as "#2" and Ending character as "#3" in ASCII respectively and the file includes series of records, but not written as Line by Line. The difficulty I'm having is, to how to transfer those data's into a database. The File comes a 7mb file and looping character by character then noting down the Record Starting Character and Record ending Character, and finally substring them is not feasible as it take more time and makes the computer slower. I would like to know is there any easy way to transfer them?

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.net - Parsing Fixed Length File With Regex?

May 8, 2012

I'm parsing fixed length file with .NET 3.5 and Regex. This file is from bank. In customer name sometimes there is one characters from this set &,(),[],',"". These are characters, so far I've encountered. There can be anything else. Because of this my regex is failing. My regex is [A-Za-z0-9s-.,'""""(){}[]]{35}. Is there any wild card I can use for special chars rather than specifying individually. I also tried . but didn't work.

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Fixed Length File Into Access 2010?

May 2, 2012

i am trying to import a fixed length text file into an access database (accdb). I already have the table created but it doesn't have to be that way. i am wondering if i know the field lengths, can i a use a SELECT INTO query to get the data into access. or do i need a schema file?

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Breaking Up A Fixed Length Flat File Into Fields?

Jul 12, 2011

so i have a file that i need to read in vb.net. Each line is 32 chars long and each line consists of multiple fields. Meaning from char 1 to 9 it idicates ID then char 10 indicates an identifier,11-14 indicates a value field. I've looked at Readblock and it's not the tool for the job. Is there a way to break up each line into its respective fields other than just reading the whole line and breaking it up as a string?

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Create Fixed Length Binary Files For Testing?

Dec 2, 2011

I have a requirement to create multiple fixed length files so that I can use the files for testing in another application. The following code causes an error when run.

[Code]...

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Declare Fixed Length Variable Arrays In Structure?

May 25, 2012

How do I declare a fixed length variable array?[code]...

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Declaring Fixed Length Variable Arrays In Structure?

May 25, 2012

How do I declare a fixed length variable arra

Structure MyInformation
<VBFixedString(4),System.Runtime.InteropServices.MarshalAs(System.Runtime.InteropServices.UnmanagedType.ByValTStr,SizeConst:=4)> Public ReturnStatus As String

[code]....

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Getting Error 91 Trying To Use A Fixed-length Arrray In A Windows Form

Mar 31, 2010

in Visual Studio 2008 Visual Basic, keep getting error 91 trying to use a fixed-length arrray in a windows form. am importing System,System.IO,System.Data,Microsoft.VisualBasic,System.Data.SqlClient. declared at start of class entry for form . have tried both Dim and Public, as Values(0 to 50) As String. then referenced in a procedure as Values(1) = I have read do not indicate that I need to use a Set or New function.

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Load A Fixed Length Text File Into Ms Access?

Jan 6, 2010

what do you think would be the best way to load a fixed length text file into ms access? this is how i would normally do it if it was comma delimitted:

sql.CommandText = "SELECT * INTO [tblMailList] FROM [Text;DATABASE=" & FilePath & ";HDR=NO].[" & FileName & "]"
sql.ExecuteNonQuery()

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Conversion Of A String To Possibly Hex Or Something Else

Dec 27, 2010

I am trying to rewrite a php function to vb.net and can't find out what the heck this does... I thought it did HEX, but I am getting a different value.[code]so basically I need something that takes each character and finds whatever "0x0" is doing.

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Substring - Error: Index And Length Must Refer To A Location Within The String. Parameter Name: Length

Apr 17, 2009

this is not working?

[Code]...

End WhileI am trying to read from the ": " to the end of the line. I keep getting this error: Index and length must refer to a location within the string. Parameter name: length

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Index And Length Must Refer To A Location Within The String. Parameter Name: Length Exception

Feb 17, 2011

am getting the above exception while swaping Items in the list(lstRoutePriority).PFB my code

if (lstRoutePriority.SelectedIndex > 0)
{
//Swap the two items

[Code].....

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Output Error "Index And Length Must Refer To A Location Within The String. Parameter Name: Length" With Substring

Mar 23, 2009

"Index and length must refer to a location within the string. Parameter name: length" whenever I run this code

[Code]...

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VS 02/03 Older Version Of Commands - Reading A Text File To A String ?

May 19, 2009

Tell me older versions of these commands to be used with .NET 1.1?

The pieces of code I am using are:

For reading a text file to a string-

Dim str As String
'reading the content of the file "test.txt" and storing it in the declared variable

[CODE]...

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Substring Size - "Index And Length Must Refer To A Location Within The String. Parameter Name: Length"

Jul 21, 2010

If using the following in an if statement I get an error: If trg.Name.Substring(4, 6).ToUpper <> ("ABCDEF") Then I get the error: "Index and length must refer to a location within the string. Parameter name: length"

I assume this is because the string (trg.name) is too small for the 4, 6 substring. What would be the correct method of working around this problem? VB.net Studio 2008.

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Generating Salt - LENGTH Of Salt Be Random - Fixed Or A Random Number Within A (min/max) Range ?

Nov 26, 2011

VS2010 (SP1) / .NET 4 on Windows XP. The question is simple, the answer; not so much. When generating a salt, should the LENGTH of the salt be random, fixed or a random number within a (min/max) range? I am using RNGCryptoServiceProvider to generate the salt, just unsure of the length of the salt.

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Fixed Width String Parsing?

Aug 5, 2011

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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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?

Sep 16, 2009

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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Format A String Into A Fixed Width Field In .Net?

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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When Transfer The Bytes Sent By The Client Program To A String The String Length Is Affected?

Feb 20, 2010

when i transfer the bytes sent by the client program to a string the string length is affected.when i put the bytes sent by the client program to a message box. it returns the corrrect text. but when i check the length it will return 8192 or higher. but the actual size is just 5.

My Code

Dim tcpClient As TcpClient = tcpListener.AcceptTcpClient()
RichTextBox1.Text = RichTextBox1.Text & vbNewLine & "Connection accepted."
' Get the stream[code]....

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