.net - Environment.MachineName Returns A Zero Length String?

May 18, 2011

I am chasing a strange error at a customer site and was wondering if it is possible that Environment.MachineName could return a zero length string. The docs say this is read from the registry but doesn't specify where. I can't imagine that a machine cannot have a netbios name but just wanted to ask.

EDIT

After some investigation, it appears that this was not returning a zero length string, but I was just interested if it is feasible.

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VS 2010 String.Length() Returns Null

Jun 11, 2011

[Code]...

By my logic, this should only assign .length to index IF the length of strItem is longer than 0. This check is there in case the listbox is empty, or the user has not selected an item. However, everytime I go through this code without an item selected I get:

[Code]...

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System.Environment.UserName Property Returns Nothing After Publishing Application?

Oct 19, 2011

I have windows application in which I get currently windows logged in username using following environment property

System.Environment.UserName But when I ran application using visual studio, it works without any problem. But when I publish application & try to run it, it get System.Environment.Username value as nothing.

cause of this issue? Or any other alternative to get current system logged in username.

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Why The Following Declarationr Returns An Array With Length = 2

Feb 16, 2010

Coming from a C# background, I have no idea why the following declarationr returns an array with length = 2

Dim lTestArray(1) As String
Console.WriteLine(lTestArray.Length) (writes 2)

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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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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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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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Environment.GetCommandLineArgs() Splits String With Spaces In It Sometimes Not Others

Sep 22, 2010

Environment.GetCommandLineArgs() splits string with spaces in it sometimes but not others, want to avoid this.

[Code]...

P.S. This was a VB6 command line app that I just converted to VB.net & the behaviour only occurs in the VB.net version. It's being called in many places at the moment, so don't really want to have to manually go through all calls & add double quotes around the whole argument.

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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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Make Connection String As Stable(unchanged For All Environment)?

Jun 6, 2011

i am using MS ACCESS DATABASE for data processing in vb.net, so i need to change the "connection string" while re-compile in another machines ,so i want to make connection string as stable(unchanged for all environment)

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When String Variable Was Empty String First One Returns 'nothing'

Oct 2, 2009

just found out that replace(string does not do the same as string.replace when my string variable was an empty str the first one returns "nothing" and the second returns an empty string (as expected).just sloppy coding anyhow, it was a function that was converted from classic asp and never rewritten properly. [code]

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Getting String.substring(N) Not To Choke When N > String.length

Mar 10, 2010

I'm writing some code that takes a report from the mainframe and converts it to a spreadsheet. They can't edit the code on the MF to give me a delimited file, so I'm stuck dealing with it as fixed width. It's working okay now, but I need to get it more stable before I release it for testing. My problem is that in any given line of data, say it could have three columns of numbers, each five chars wide at positions 10, 16, and 22. If on this one particular row, there's no data for the last two cols, it won't be padded with spaces; rather, the length of the string will be only 14. So, I can't just blindly have

[Code]...

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Vb String Function - Get The Sub String That Is Talking About Length

Nov 4, 2010

If I have a string Metal is hot : Metal length is 5 cm ; Metal is red. I want to get the sub string that is talking about length: hence I want to extract "Metal length is 5 cm".

[Code]...

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Developemnt Environment But Not In Deployement Environment?

Dec 15, 2009

I have VB6 Dll which I am referencing in vb.net ,I am calling the following function in it. It working fine in developemnt environment but not in deployement environment.

Error Method not found: 'Boolean MyUtils._MyUtils.LoadMyObjectRecords(ADODB.Stream ByRef, System.Array ByRef)'.

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.net - Asp.net Code Returns A Blank String

Jul 28, 2011

Anyone know why the following is not working?

[Code]...

I get no errors, it just returns a blank string.

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Counting The Length Of A String?

Oct 29, 2009

How can I count the length of a string and also how many special characters are in the strings.

For instance if I have this string: $how*

How can I count that string is 5 chars long and that there are 2 special characters in the string. (special characters are the $ and

I think that I am going to have to use the .length method to count the length of the string.

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Field Cannot Be A Zero-length String

Mar 2, 2012

i had the code belowing workin fine before but all of a suden i have a error init

[Code]...

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How To Get String Length Of ReadData

Apr 6, 2011

I was trying to grab the string length of readData but when I try msgbox (readData.Length),
its giving me a large numeric digit instead.
Dim readData as string
serverStream.Read(inStream, 0, buffSize)
Dim returndata As String = _
System.Text.Encoding.ASCII.GetString(inStream)
readData = "" + returndata
msg()

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Set Max String Length In A Class?

Mar 2, 2009

Is there any way to set max string length in a class used in a VB.NET web service so it gets into the WSDL as a maxLength attribute?

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Setting The String Length ?

Apr 15, 2010

With setting the string length. I have got a streamreader reading from a .doc file into a listbox and then i want to set the string length of how long it to be and then if longer to go to the next line so it will fit in the listbox as the listbox you cant scroll accross but you can up and down.

Ive done this so far:

Try
Dim file_name As String = "K:\Uni\Year 2\Visual Basic\Report\MSDN\Absolute Beginner's Series VB Lesson 1\01 VB Lesson Transcript.doc"

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

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String Length Not Working?

Jul 16, 2009

I have the below code that if there is no .wav file in the current directory then it goes to the default windowsmedia directory to play a random .wav file.

But for some reason if there is no file in the current folder it will not go to the windowsmedia folder, do I have something wrong?

Dim FileNames As String() = System.IO.Directory.GetFiles(".", "*.wav")
Dim FileNames2 As String() = System.IO.Directory.GetFiles("C:WindowsMedia", "*.wav")

[Code]....

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.net - Difference Between New TcpClient(MachineName, Port) And New TcpClient(new IPEndpoint?

Mar 31, 2011

I have a .Net program that has to run on a cluster of server 2008. To find out the right IP I resolve the dns by GetHostEntry(VarDefinedInfConfig).AddressList(0)

but when I am converting my old code (this code picks the wrong IP) dns.GetHostName().AddressList(0) => this returns a virtual IP and not the right one.So I changed my TcpListener to (dns is parameter from config)Dim listener As TcpListener = New TcpListener(New IPEndPoint(Net.Dns.GetHostEntry(dns).AddressList(0), 8001))
listener.Start()

[Code]...

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.net - GetPrivateProfileString() Returns Empty String Despite Having A Default?

Jul 9, 2010

Private Declare Function GetPrivateProfileString Lib "kernel32" Alias _

"GetPrivateProfileStringA" (ByVal lpApplicationName As String, _
ByVal lpKeyName As String, _
ByVal lpDefault As String, _
ByVal lpReturnedString As String, _
ByVal nSize As Integer, ByVal lpFileName As String) As Integer
Dim value As String = ""
Dim length As Integer
Dim IniFileName As String

GetPrivateProfileString("Config", "UserName", "None", value, length, IniFileName)

but value contains an empty string I confes to being a VB n00b, less than a week, in fact, but I can't see what's wrong there. The file exists, it contains a section called "Config" which has an entry called "UserName" with a value - but even if not, wouldn't value take the default?

Edit: It's not returning an empty string - it's returning whatever I initialize value to before calling GetPrivateProfileString().

Which is to say that if I Dim value As String = "xxx" then it stil contains "xxx" after the call and not the default value.

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GetPrivateProfileString() Returns Empty String, Despite Having A Default?

Oct 25, 2009

Private Declare Function GetPrivateProfileString Lib "kernel32" Alias _
"GetPrivateProfileStringA" (ByVal lpApplicationName As String, _
ByVal lpKeyName As String, _

[code].....

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Selectedvalue Method Returns Null String

Jun 29, 2011

I'm converting a system of numerous programs from foxpro/foxweb/javascript to asp.net/vb/sql server.

I'm coding for a dropdownlist which is currently controlled via js.

I don't like using the control this particular way, but I want to maintain look and feel for the customer.

The control is initialized with some values via Page_Load() in behind code.[code]...

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C# - Ensure That A String Property Is Of A Particular Length?

Sep 2, 2010

I've created some classes that will be used to provide data to stored procedures in my database. The varchar parameters in the stored procs have length specifications (e.g. varchar(6) and I'd like to validate the length of all string properties before passing them on to the stored procedures.

Is there a simple, declarative way to do this?

I have two conceptual ideas so far:

Attributes
public class MyDataClass
{
[MaxStringLength = 50]

[Code]....

This seems like a lot of work and will really make my currently-simple classes look pretty ugly, but I suppose it will get the job done. It will also take a lot of copying and pasting to get this right.

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Checking String If 7 In Length And Contain Any Other Characters

Dec 3, 2011

I am working on a program that will take in a string of length 7 containing either R,G or B for the colours. The program will then check that the string if 7 in length and if it contains any other characters than R, G or B then it will be invalid. I created this code but when I enter the right string length and characters it always gives me the error for not having the right string length.

Private Sub get_cars()
Dim Letter As String
Dim valid As Boolean
Dim position As Integer
txtPosition.Text = position
[Code] ......

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Create An Empty String That Is A Certain Length?

Jan 31, 2011

How can I create an empty string that is a certain length?

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