Reading A Null Terminated Byte?
Mar 29, 2011
I'm reading a binary file. Apparently its older, and some of its values are based not on position, but on null terminated bytes. Position 17 thru 35 represents a value, however, if their is a null byte at 30, then you get garbage if you try to read 17 thru 35 as a value...
I need to read, specifically, from 17 to 29 in this instance because pos 30 is a null byte.
Have to read it byte by byte, no problem. Not sure though the syntax of comparing a null byte specifically.
If you need a sample of the binary file, I can post it.
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Dec 18, 2011
I must search a binary string for a pattern. This worked fine in VB6 using Get to read a file into a string and using InStr to search for the pattern. The conversion from VB6 to VB.NET changed Get to FileGet and warned of new behavior, but I don't see anything in the FileGet documentation about not being able to read 0 value bytes.
I don't mind at all changing to a new method, but ultimately I must get the data into a string rather than an array.
[Code]...
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Feb 1, 2010
Is there any way to convert null terminated string to normal string.I mean I can easily make a program to find the location of vbnull but there has to be a built in function for that.
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Mar 29, 2012
I am trying to call an external C++ function using VB.NET (answers in C# are fine, I can convert back) which returns a list of device names. This comes in the form of a pointer to a null-terminated array of null-terminated char arrays (correct me if I've misunderstood what I'm dealing with) with a function signature:
long GetNames(char*** names)
Most of the answers to similar questions I've found have involved something more like:
long GetNames(char** names, int length)
It appears from what I've read that I need to give it an IntPtr but I'm uncertain as to how this should be initialized, and in my case I don't know the length of the array. At the moment, in the VB module, I have:
<DllImport("MyExternal.dll", CallingConvention:=CallingConvention.Cdecl)> _
Function GetNames(ByRef names as IntPtr) As UInteger
End Function
I've tried calling the function by passing an IntPtr initialized as IntPtr.Zero or using Marshall.AllocHGlobal, but I always get an AccessViolationException.
Any ideas on how I should be calling this function and how I get the return value into a managed string array would be greatly appreciated.
EDIT: I've found a sample function call in native C as follows:
char **tmplist;
GetNames(&tmplist)
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Dec 16, 2009
Is there any way to convert null terminated string to normal string.I mean I can easily make a program to find the location of vbnull but there has to be a built in function for that.
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Jun 27, 2011
I have a function that returns a byte(), the only problem is that the array most times is to long and has 4 or 5 excess null bytes. I want to remove them and tried everything, but I cant seem to find anything that works.
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Jan 13, 2011
bytes ( 00 00 00 ) I'm trying to remove from a specific set of locations within a byte stream. The following code is what I'm using. I tried using the Trim function as listed in the code at the bottom but that had no effect. I'm extracting from a fixed byte range and there are null values after the end of valid ascii characters. Dim temp() As Byte = GetByteArray(FrameData, 3, 32)
Private Function GetByteArray(ByVal MyArray As System.Array, ByVal Start As Integer, ByVal Length As Integer) As Byte()
[Code]...
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Dec 28, 2011
I've converted an application for connecting to a vpn server and starting a remote desktop connection from vb6 to vb.net. But now when I'm trying to run the program I get an ArgumentNullException I've tried searching for a solution but I've been unable to find one. Below is my code:
[Code]...
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Feb 2, 2011
I have a packet that I need to send to a client with an ID of 255. I've had no problems sending packets with IDs of 0, 1, and 2. The ID has to be 255. For some reason, after the translation has happened, both me with my server, and the client, get "63" for any Id greater than 127.
This is the code I am using:
Console.WriteLine(Asc(System.Text.ASCIIEncoding.ASCII.GetString(System.Text.ASCIIEncoding.ASCII.GetBytes(Chr("255")))))
Now, This is an overly complicated version of what the server does. You may consider this a bit unnecessary but the inverse functions performed are for your viewing reasons only.
Where it says "255" is the Packet Id I need sent in the format above. As I said, anything larger than 127 returns "63".
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Jan 19, 2011
File.txt contains both chinese and english characters.. English characters are 1 byte and Chinese characters are 2 bytes.
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Jul 18, 2010
I am reading some values from a Byte Array ,i am confused with the Offset
[Code]...
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Jan 10, 2010
Is there any way using existing .NET framework classes/methods that you can sequentially read a byte array? I dont mean just using a for loop to loop through from the beginning to the end, I mean having the kind of methods that you have when working with an IO.Stream subclass, such as ReadByte. I thought I would just be able to construct a new IO.Stream class and pass it in a byte array but it seems that Stream is just for inheriting and cannot actually be used itself. I could implement my own class that just has an internal position counter and a byte array and then each time you call ReadByte on that it advances the position and returns the byte at that index... but it seems odd to have to implement such a basic thing myself.
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May 25, 2009
I am sending data to server via TCP IP Connection. I am using a continuous loop at the server end - that accepts new clients and while streams can be read, it reads data stream.
The data is sent from the client with 2 leading bytes of data that represent the size of the packet of data sent and type of data.
My question is: how do I retrieve the size of the data packet and then check that this amount of data has been retrieved?
[Code].....
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May 25, 2009
I am sending data to server via TCP IP Connection. I am using a continuous loop at the server end - that accepts new clients and while streams can be read, it reads data stream.
The data is sent from the client with 2 leading bytes of data that represent the size of the packet of data sent and type of data.
My question is: how do I retrieve the size of the data packet and then check that this amount of data has been retrieved?[code]...
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May 23, 2011
I need to read signed and unsigned 8 bit, 16 bit and 32 bit values from a file stream which may be little-endian or big-endian (it happens to be a tiff file which carries the byte order indicator at the start).I initially started by writing my own functions to read the values and was able to do so for unsigned values. e.g.
Public Function ReadUInt32() As UInt32
Dim b(4) As Byte
input.Read(b, 0, 4)
[code]....
But then I started looking at signed values and my brain broke.As an alternative, I found the IO.BinaryReader which will let me read signed values directly but doesn't seem to have any way to indicate that the data is big-endian or little-endian.Is there a nice way of handling this? Failing that, can someone tell me how to convert multiple bytes into signed values (in both byte orders)?
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Oct 4, 2011
This is my Connection String :
cn.Open("Provider=Microsoft.Jet.OLEDB.4.0;" + "Data Source=" & PathtoTextFile & ";" + "Extended Properties=""text;HDR=YES;FMT=Delimited""")
[code].....
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Nov 21, 2011
I'm having this exception while trying to get the value of a cell from a table.[code]...
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Mar 4, 2010
i am not getting the integer values in dataset while reading from an excel files the field which is integer will be showing as NULL.
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Aug 13, 2010
So I want my program to read a file, but sadly there are null characters in the text file. The program searches for strings and I want it, when searching, to ignore all of the null values and just the actual characters. Is this possible?
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Sep 27, 2009
Reading Excel in .NET - some columns are read in as null
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Aug 7, 2010
Why does C# define Byte+Byte=Int32 instead of Byte+Byte=Byte like VB?
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Oct 25, 2011
I have a vb.net app that I can read a .xls file into a dataset or loop through as oledbdatareader and it gives the same result.Some of the rows have all nulls when I loop through them but if I open the same file in Microsoft Excel I can see that row fine.[code]From the info above the first two SKU values would come through fine but when I get to the 3rd row it would show a null.Is it possible that it kind of inherits the first rows type and since the 3rd row isn't all numeric if nulls it? [code]
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Mar 10, 2009
I have an third part dll that have a function that returns a string.When I call the function I got for example "123456" back. At least it seams like that, but when i do mystring.length it does not return any length. If I set the text property of a label it shows "123456".
When I have the string I got from the dll I send it to a webservice function:
rem call dll and get string
dim mystring as string=mydll.getstring()
rem Send it to the webservice
webservice.SaveString(mystring)
The webservice crashes with an webexeption ("protocoll error") when I send in the string I got from the dll. If I instead send it like this:
rem call dll and get string
dim mystring as string=mydll.getstring()
rem Send it to the webservice
dim FixedString as string = mid(mystring,1,6)
webservice.SaveString(mystring)
Then it works and everything is fine. That leads me to think that the string I got from the DLL is in someway not terminated correct.And I dont know how to fix it from vb.net (I cant change the DLL)and I dont know in beforehand how long the string will be.The dll does only work on site when specific hardware is connected so I can't sit at the office trying to fix this in dev-environment. So I would like to have some possibly solutions to this before I go to the customer again.
Edit 1:I tried to just do a loop that looped from 1 to 100 (because I dont know the real length) and tried to copy all characters that <>"" to a new variable but it didnt work. I didnt try other variants because the day was over and I had to leave the customer site.
Edit 2:The DLL Im talking to is made in VB6. That DLL is talking to other DLLs that is made in C++ (I think).
My program < - > vb6-DLL <-> c++-DLL <-> hardware
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Mar 15, 2012
I need to be able to terminate/locked the account in vb.net if the user input wrong username/password in my Log In form like 3 attempts is good. and be able to enabled the account also as an Admin.
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Jan 2, 2012
String or binary data would be truncated. The statement has been terminatedAs I've looked back on my backend or code. It looks like there's a conflict adding a TWO LABEL DATA in one column because I would like to join the (Year)-(StudentNumber)Here's the code of my INSERT INTO Statement
INSERT INTO
[Student_Information] (StudentID, LastName, FirstName, MiddleName, Gender,
ContactNumber, Citizenship, Religion, Birthday, Address)
[code].....
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Mar 8, 2012
This gets data from Excel and puts it into a table. The first 2 rows of data are placed into the table. All the fields columns are the same type and nothing is larger than it should be name is varchar(30) team is varchar(3) pos is varchar(2) rest are int or double. I place an i in front of integers s in front of string and so on. The 3rd row crashes with the following message at Command.ExecuteNonQuery() String or binary data would be truncated. The statement has been terminated.
Option Strict Off
Imports System.Data.OleDb
Imports System.Data.SqlClient
Public Class Form1
[Code] .....
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Jul 4, 2011
Protected Sub cmdOK_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles cmdOK.Click
Dim medID, medName, comment As String
[code].....
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Apr 16, 2009
Am using Vb.NET 2008 and SQL 2008. I have a problem, when the execution reaches daAdapter.Update(dtTable) then I receive this error ""String or binary data would be truncated.The statement has been terminated"" Then the record fails to update.Below is the complete code. Thanx in advance.
Dim SQLCon As SqlConnection
Dim SqlQuery, SqlQuery1 As String
Dim daAdapter As SqlDataAdapter
[code]....
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Feb 27, 2012
iam trying to insert some values to SQLServer 2005 Database.The following error displaying.I changed the corresponding column size,still the error persists.how can i sove this error-:'String or binary data would be truncated.The statement has been terminated'
Me.Personal_detailsdbTableAdapter.Insert(Me.FirstnameTextBox.Text, Me.LastnameTextBox.Text, _
Me.PassportnoTextBox.Text, Me.PlaceofbirthTextBox.Text, _
Me.SexTextBox.Text, Me.DobDateTimePicker.Value.ToString)
This is the SQL Database Table Design
firstnamenvarchar(50)Checked
lastnamevarchar(20)Checked
passportnonvarchar(50)Unchecked(Primary Key)
[code]....
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Apr 6, 2011
Objective: Combine byte arrays, read specific sections, and then cut byte array at specified point.
Private Sub DataArrival(ByRef aBot As xyzSocket, ByRef theData As Byte())
Dim RDLength As Int32
If aBot.ReceivedData Is Nothing Then[code]....
I'm not sure if I have this right to begin with because I can't test it without having it completed.
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