I am tasked with the job of reading the X and Y coordinate of a Text label from a "save file" of a 2D CAD drawing. I found the exact position of the coordinates in the file, but I still don't understand how to read them 100%. They aren't simple ASCII characters.First, I read the file byte by byte, and load them into a textbox seperated by spaces as numbers from 0 to 255. Here is an example X and Y coordinate
View 1 RepliesI wonder, whats the proper, accepted way to convert doubles to strings? I've heard cstr(blah) is wrong (despite it working perfectly OK for me....), what is the proper way to do this say if I want to display the value of a double in a textbox (along with 'the answer is' or somesuch)?
View 1 Repliesmy goal is to
1.Take an file(exe,dll,etc)
2.Convert it into hex
3.place that hex values in a stack
4.Execute the values inside the stack to its original form(i.e. take the elements out of stack and then convert it to a compile format)
Imports System.IO
Sub Main()
Dim fileName As String = "ABC.exe"
[code]....
i have seen many posts resolving issues with converting bytes to KB, MB and GB...how would i convert GB,MB and KB to bytes?
View 11 RepliesI have been looking for a way to convert bytes down into another unit and append the unit format to the end and return it. I have found a few posts about it but I didn't perticularly want to write that much code that they listed, so I designed "my own" (I'm sure I'm not the only one who has done this method).Since I am pretty new at all this, I was wondering if anyone could let me know if there are any problems with how it would process the information and perhaps make it faster.[code]
View 29 RepliesI made a thread about Converting Form Bytes to Text and I got the answer but I wanted to ask if I can do the Opposite (Convert Text To Bytes).
View 1 RepliesI've got the following simple code to convert Bytes to a Hex string :-
Code:
Shared Function BytesToHex(ByVal bytes() As Byte) As String
If bytes Is Nothing Then Return ""
Dim S As String = BitConverter.ToString(bytes)
[Code].....
The HexToBytes routine obviously can take a lot longer to complete than the BytesToHex routine and is noticeably slower when dealing with a lot of data. As I'm converting a lot of hex strings back to bytes, I wondered if there was a more efficient way of doing it without looping through the whole string as I am doing?
Ive 2 buttons and 3 text boxes.Button 1 encrypts the data from textbox1 to bytes, converts it to string and display it in textbox2.Button 2 reads string from textbox2, converts it to bytes and decrypts it displaying it in textbox3 (textbox1 and 3 got to match).The encrypt/decrypt process works fine but the conversion from string to bytes is failing and cannot seem to find the problem. The error states that the string doesnt have the same format (Bytes(i) = Byte.Parse(Values(i))
[Code]...
This has to be incredibly simple, but I must not be looking in the right place.
I'm receiving this string via a FTDI usb connection:
'UUU'
I would like to receive this as a byte array of
[85,85,85]
In Python, this I would convert a string to a byte array like this: [ord(c) for c in 'UUU']
I've looked around, but haven't figured this out. How do I do this in Visual Basic?
I am having trouble converting the Bytes() to a readable text.
I will be receiving packets from a UDP Connection, but due to lack of connectivity issues, they have provided me a .mem file that i am assuming is the whole stream of the packet.
So for now, i am trying to read the file and i get a collection of bytes(). but i cannot convert it to readable text.
I want to take a number such as 600 (0x0258) and send these hex values to a C-based system which is assigning char's to the received bytes and rebuilding to the original number. Currently, I am converting to bytes in VB.Net but it is not giving me the expected outcome (because of the ascii nature of the transfer most likely) [Code] I've also tried using Hex but this doesn't get the data in the correct format.
View 5 RepliesI have query that involves a cross-language operation, namely converting 4 SBytes to a signed integer. The source language for this operation is Java, which utilizes the ByteBuffer in order to extract a signed integer from the data stream. The inner workings of ByteBuffer are at best a black box to me, as I haven't been able to find any hints to what actually goes on when Java extracts the integer. [Code]
View 2 RepliesI am reading and writing binary data through a serial port and must (a) reassemble the incoming four bytes that make up a IEEE single-precision float into an actual float, and (b) disassemble a float into its four constituent bytes before squirting them through the serial port.
I am using VB.NET 2008. In VB6, I could use the LSET command, as in:
Code:
Private Type typByteArray
B(1 To 4) As Byte
End Type
[Code]....
But of course this code won't work in VB.NET. In C it would be easy to handle situations like this by using unions, but VB.NET doesn't support them.
I have a string of bytes which I am reading from a microcontroller via a serial port which is as follows : 02 10 18 14 CB 73 43 D3 14 00 0D 00 09 00 1B 00 04 B8 3C 00 00 24 00 30 AB
I would like to write some code to place each the bytes into an array with each element of the array consisting of one byte each.
Dim result as single = 0
result = CType("8.01", Single) * 100 ' result=801.0 as expected
result = CType("8.02", Single) * 100 ' result=802.000061 --- not expected
Further to the above
result = 8.02 * 100 ' result = 802.0 as expected
I have a file - (called 38.dat) it contains a 3600 numbers (single) which are undelimited. This file cannot be read by notepad so is not in text format but saved a floating point numbers. how could i get VB.net to read the file and save the values to an array the size of 120 x 30?
View 1 Repliesi have a text document that is a list of words. How do i code using substring so that it singles out each of these words and makes it into an array?
View 14 RepliesI want it to do is that you input a string, then you select an algorithm (Theres only going to be one RijnDael) then you input a key, then the Initialization Vector comes from "txtIV.text" then you select the key bytes and the block bytes from the numeric up/down, then you either encrypt or decrypt.
View 1 RepliesOk i am having some issues designing a base-class to handle generics.Caveat is i need to restrict the type put in as a Numeric type, specifically Int16, Int32, or Int64 (Short or Long).I know you can do Of T as {Structure} but i dont want to select the key bytes and the block bytes from the numeric up/down.
View 2 RepliesI keep getting a ProtocolViolationException "Bytes to be written to the stream exceed the Content-Length bytes size specified." on the following code.I've tried setting Content-Length numerous ways with no success.
Dim url = "https://domain.com"
Dim req As WebRequest = WebRequest.Create(url)
req.Method = "POST"
req.ContentType = "application/xml"
[Code]...
What exactly does this line do?
i = stream.Read(bytes, 0, bytes.Length)
Does it read the entire message string sent by the client? I have a line to write to the stream later in the code and that does not seem to be sending anything back to the client, although the code around is excuting.
i = stream.Read(bytes, 0, bytes.Length)
While (i <> 0)
Try
' Translate data bytes to a ASCII string.
[code].....
I created a text file contains 4 bytes of data
AABBCCDD
I just want to read the first 2 bytes (AABB) to execute it with my program.
Then I'll need to read the last 2 bytes (CCDD) for another computer routines
Probably missing something silly here, Her eis what my display looks like Sending image...(401303) I would prefer it displays as Sending image...(391 kb)
[Code]...
I have a label that displays the result of a calculation, i.e lblTotalCost.Text = dTotalCost, where dTotalCost is a Double. When I try use FormatCurrenct(lblTotalCost.Text = dTotalCost), the program crashes and says unable to convert string to double.
View 2 RepliesI've got a heavily used web application that, for the first time in 2 years, failed doing an equality check on two doubles using the equality function a colleague said he'd also been using for years. The goal of the function I'm about to paste in here is to compare two double values to 4 digits of precision and return the comparison results. For the sake of illustration, my values are:
Dim double1 As Double = 0.14625000000000002 ' The result of a calculation
Dim double2 As Double = 0.14625 ' A value that was looked up in a DB
If I pass them into this function:
Public Shared Function AreEqual(ByVal double1 As Double, ByVal double2 As Double) As Boolean
Return (CType(double1 * 10000, Long) = CType(double2 * 10000, Long))
End Function
the comparison fails. After the multiplication and cast to Long, the comparison ends up being:
Return 1463 = 1462
I'm kind of answering my own question here, but I can see that double1 is within the precision of a double (17 digits) and the cast is working correctly. My first real question is: If I change the line above to the following, why does it work correctly (returns True)?
Return (CType(CType(double1, Decimal) * 10000, Long) = _
CType(CType(double2, Decimal) * 10000, Long))
Doesn't Decimal have even more precision, thus the cast to Long should still be 1463, and the comparison return False? I think I'm having a brain fart on this stuff...Secondly, if one were to change this function to make the comparison I'm looking for more accurate or less error prone, would you recommend changing it to something much simpler? For example:
Return (Math.Abs(double1 - double2) < 0.0001)
Would I be to try something like:
Return (double1.ToString("N5").Equals(double2.ToString("N5")))
Having problem make last if an statement work in the code. the variables in the if statment are doubles but the ide keep telling i need a proceeding if statement. but is already there it is in the last if statement of the code
Public Class Form1
Dim Totals As New List(Of Double)
Private Sub btnclear_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles
[CODE].....................
I have a bunch of type Double variables in my program, say for example
Dim Area as Double = 0
Dim Perimeter as Double = 0
Somewhere in my program I want to calculate these values, so I define
Public Sub TheSquare(ByRef TheArea as Double, ByRef ThePerim as Double, ByVal TheSide as Double)
TheArea = TheSide^2
ThePerim = 4 * TheSide
End Sub
and somewhere in the program I'm collecting side lengths and calculating the area and perimeter; say
While True
S = GetSideValueFromSomewhere()
TheSquare(Area, Perimeter, S)
End
In my real program, I have, say, 20 quantities that I want to calculate. Obviously each one has a different equation. But in the end I want to output all 20 to a file, so to save typing, I create an array of the quantities, like this:
Dim TypingSaver() as Double = {Area, Perimeter}
so that I can dump values to file with a three-line for-loop instead of copying and pasting 20 variable names.
This does exactly what I want if Area and Perimeter were reference types like Objects. But since they are Doubles, TypingSaver contains only their values, not references to the actual variables. So after I use my TheSquare function the values of Area and Perimeter are correctly updated but TypingSaver just constains whatever the values of Area and Perimeter were when I declared the array.
how can I create an array of references to doubles in VB.NET?
I have a dataset (imported from a XML file) with double records (clientname), and I want only the records with the most recent date (datetime field) written to a SQL database. Now I sort the dataset ("clientname ASC, DateTime ASC"), so the newest entry is written to the database.
[Code]....
could anyone show me a code on how to transpose a two dimensional array of doubles (changing rows to columns and vice versa) ?
View 1 RepliesI have the following code in vb.net that calculates the amount before tax was applied:
Public Shared Function CalculateRateBeforeTax(ByVal rate As Decimal, ByVal tax As Decimal) As Decimal
Dim base As Decimal = rate / (1 + (tax / 100.0))
Return Math.Round(base,2)[code]....
I put the above scenarios into some unit tests using c# and using the nunit testing framework. The first scenario passes, but the other fails and I am not sure how I can get it to pass. Here is are my tests:
[TestFixture]
class TaxTests
{[code].....
As I said before, the first test passes, but the results of the other tests are:
Second Test expected 305.1600000000000003d But was: 305.1643192488263d
Third Test expected 95.54999999999997 But was: 95.55555555555555557d