Byte Wise Reading From FILE?
Jan 19, 2011File.txt contains both chinese and english characters.. English characters are 1 byte and Chinese characters are 2 bytes.
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Construct Command Byte To Send To Another Device Using Bit Wise Operations
May 27, 2010I have a need to construct a command Byte to send to another device using bit wise operations.There seem to be plenty of article on how to do this for indiviual bits using an OR'd constant but how do I do this for values that span multiple bits? eg "Bits 4-1" set the repeat count".so how to I inject a repeat count value of say 7 into my command byte?
View 1 RepliesFileGet Stops Reading Binary File At First Null (0) Byte?
Dec 18, 2011I 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.
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Reading Packet Id From Byte?
Feb 2, 2011I 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".
Reading A Null Terminated Byte?
Mar 29, 2011I'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.
BitConvertor - Reading Values From A Byte Array
Jul 18, 2010I am reading some values from a Byte Array ,i am confused with the Offset
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VS 2008 - Sequentially Reading Byte Array
Jan 10, 2010Is 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.
View 1 RepliesRead A Raw Byte Array From Any File, And Write That Byte Array Back Into A New File?
Sep 20, 2009How do I read a raw byte array from any file, and write that byte array back into a new file?
View 3 RepliesRDLC Report Page Wise Total And All Page Wise Total On Last Page?
Feb 3, 2012I am developing a small application with VB 2008 and MS SQL 2005. For reporting using RDLC reports. Everything is going well except page wise total.I need page wise total on each page and each(all) page wise total should be displayed on last page. I need the report output like this.
SrNo. Amount
1. 200
2. 200
3. 200
[code]....
Note : No. of rows/page are not fixed.For group Total I have used Sum function of rdlc table with scope table_Group2 & for Grand total I have used Sum function of rdlc in table footer with dataset scope.For page wise total I have used textbox in Report footer (=Sum(ReportItems!amt.Value). How to get page wise totals on last page again.
Check Packet Size Of TCP Data Before Reading Next Byte In Stream
May 25, 2009I 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?
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Check Packet Size Of TCP Data Before Reading Next Byte In Stream?
May 25, 2009I 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]...
Reading Signed And Unsigned Values From A Stream In Both Byte Orders?
May 23, 2011I 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)?
File I/O And Registry :: AVI Header - Program To Download And Play AVI Files The Files Are Large In Size And Long Time Wise
Dec 11, 2011I wrote a program to download and play AVI files the files are large in size and long time wise. I have the files playing as they are being downloaded but i can't see how long the file is or seek reliably. i was reading that the AVI headers are in the last 512kb of the AVI file *why would't they put it at the start* lol so my question is is there a way to download the last 512Kb of the file i'm downloading. i have the Bytes Read and Length of the file while its downlaoding i'm just not sure where to go from there, or how to do it atleast. If i had the length in time of the Avi file i could set the trackbar to be able to seek properly. or if someone has an idea how i could get the time of the video by using fps and some math i could prob do it that way too but idk how i would tell how i can find how many kb are in the fps i'm sure it changes so think that way is't going to be reliable. how to get the last 512kb would be the best option not sure if it can be done even.
View 4 RepliesWhy Does C# Define Byte+Byte=Int32 Instead Of Byte+Byte=Byte Like VB?
Aug 7, 2010Why does C# define Byte+Byte=Int32 instead of Byte+Byte=Byte like VB?
View 1 RepliesGet Images Row Wise In Datagridview
Feb 26, 2009i want display images row wise using datagridview in windows-application. in asp datalist control is used but windows any control is there.
View 1 RepliesCall Namespace Wise Classes In 6.0?
Jun 19, 2009iam creating Vb.net classes under the different namespaces after that build that source code,i got the Type Library file.but iam using the Assembly Name in VB6.0 iam not able to getting classes under the namespace wise.
eg: Dim A As New Test.A - It was possible
but iam using with one namespace like
Dim A As New Test.Utility.A
This was not working.
Dim obj As DynamicPDF.ReportDocumentLayout - it was comes correctly But,
Dim obj As DynamicPDF..ReportWriter.ReportDocumentLayout - Not comes like this.
Note:
ASP: it works fine.
Server.CreateObject( "DynamicPDF.ReportWriter.ReportDocumentLayout" )
Datagrid Update With Column Wise
Feb 6, 2011I want to add the ability to post images to facebook or Flickr in my app.Basically, they just browser for the file using an OpenFileDialog to get the path. Then they click an 'Upload to Flickr' or 'Upload to Facebook' option.how to do the upload to facebook/flickr part? How is it done?
View 1 RepliesMoving Pictures Clock Wise?
Nov 30, 2009How could we move Picture clock wise or any other movement in VB.net.
View 2 RepliesHow To Retrieve Data In Textbox Row-Wise From MS Access
Jan 15, 2010How can I retrieve data in textbox.text row-wise from Ms access??
View 2 RepliesIDE :: VB6.0 Creating A Class Instance Not Comes Namespace Wise?
Jun 26, 2009In VB.net we are creating different namespace level classes. For Example,DynamicPDF - Root NameSpaceTest ,Report are two sub folders in side the sub folders some classes.
1) DynamicPDF.Test.ClassA
2) DynamicPDF.Test.Report.ClassB
using the VB.NET i was generated the Tlb file.
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.net - Using SortCompare Event To Sort Datagridview Integer-wise?
Nov 10, 2009I use the streamreader to fill a datagridview. I need to sort the datagridview integer-wise and have tried to use the SortCompare event. To compare the row values i use the function
Public Function CompareIntegers(ByVal value1 As String, ByVal value2 As String) As Integer
Dim int1 As Integer = Integer.Parse(value1)
Dim int2 As Integer = Integer.Parse(value2)
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Which i call from the SortCompare event with
Private Sub DGV_SortCompare(ByVal sender As Object, ByVal e As System.Windows.Forms.DataGridViewSortCompareEventArgs)
e.SortResult = CompareIntegers(e.CellValue1, e.CellValue2)
End Sub
The event is fired but the datagridview is still sorted as strings.
Three Location Binary Data - Implement Bit Wise Operation?
Jul 31, 2008Suppose there is a three location binary data: xxx, I want to create a NOT operation on the second number and keep other 2 numbers or vs.
For example, 010 --> 000, 110-->100, 111-->101, 000--> 010
In decimal , it means 2-->0, 6-->4, 7-->5, 0-->2
How to do it with VB?
File I/O And Registry :: Safe A String Or Byte-array To File In Utf8 Format?
Sep 4, 2008trying to find a decent answer for my question; I do have a utf8 file which I (down)load, manipulate and wanting to save back again.The result always is that the file I produce is not in utf8 format;
Dim fs2 As New FileStream("c: est.dat", FileMode.Create, FileAccess.Write, FileShare.None)
Dim w As New BinaryWriter(fs2, Encoding.UTF8)
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Modify Few Byte In A File Via A Stream Does That Means That Full File Is Rewritten?
Jun 9, 2010If i use a stream to modify few bytes in a file without changing the total number of bytes
does the stream rewrite all the file even if just few bytes have been replaced?
Combine Byte Arrays, Read Specific Sections, And Then Cut Byte Array At Specified Point?
Apr 6, 2011Objective: 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.
MyAlgorithm - Encrypt And Decrypt Byte By Byte And Place A Asci Code In Bytes(0 To 255)
Dec 18, 2010I create my algorthm and its finished but there is a problem, it encrypte all text and all text in a file but after decryption when i open my file (a video file)the player show all information about file(duration,size and ect) currectly but it dont play that my program encrypt and decrypt byte by byte and place a asci code in bytes(0 to 255)
View 12 RepliesChange Byte() To Structs For Readability And Convert Struct To Byte Stream For Socket Send()
Dec 8, 2009I just converted the following code from c# to vb.net. It is functional and works correctly with my company's firmware/devices. My next challenge. Previous serialport code used much more readable structs which where then converted (after building a packet) into byte() automatically as part of the serialport encoding. (this is my understanding)How could I
1. morph byte arrays 'ToSocket' and 'ToMTP' below into structs and
2. convert into byte array for Socket.BeginSend(byte(),.....) to stream out to remote devices?
Imports System.ComponentModel
Imports System.Text
Imports System.Net.Sockets
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Error: Value Of Type Ƈ-dimensional Array Of Byte' Cannot Be Converted To 'Byte'
Jul 13, 2012how to upload file using fileupload control into sql database. I have class where i created insert function and getting info frm the .aspx.vb file
Class File
========
Imports System
Imports System.Data
Imports System.Data.SqlClient
[coe]....
Truncating Data Types From Int To Byte, Transferring 8 LSBs To The Byte?
May 16, 2011Is it possible in VB to truncate a larger data type ( an int with a value greater than 255) to a smaller one, say a Byte (which only goes up to 255) in a way such that the 8LSBs of the integer are copied to the newly created byte. I have tried this using CType with the following code, however it does not work.
Dim TestByte As Byte = CType(Test, Byte)
Where the variable "Test" is an integer with a value of 419. This code always results in the Overflow exception.
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Reading, Then Using, Then Reading Text File?
Jan 2, 2010I am working on a project in VB 2008 and need it to do this:Read first line from text file (using Openfile)Enter line into textbox on formDo some other codeThen Read second linefrom text fileEnter line into same text boxand loop until we have gone through text fileI am not sure how to read line by line from text file then enter it in textbox. I can open the Openfile and get the filename and everything, but I just am not sure how to read from it or enter that line into the textbox.Here is what I have, its not much but its a start:
Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
Dim FileReader As StreamReader
[code]....