I understand the concept of bytes and declaring variables to save on processing space. I understand that the max value that can be stored in a byte is 255. I cannot seem to wrap my head around my current issue. I don't have much experience working with byte manipulation.
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I would like to know how to convert a unisgned byte to signed byte
Atm I got this
a
Function readSignedByte() As SByte
'-128/127
Dim b As SByte
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it doesn't work one that well works for numbers positive over 127 if lets say ReadByte() has 128 it would give overflow error which I don't want it to give I would like it to overflow the number to negivate value aka its signed value.
I've to write this application in which i've two text boxes and of those, i've to determine which number is smaller or larger or if both are equal.
View 13 RepliesI have a datagirdview which I need to process.. I have more than 50000 rows and 200 columns in it. DataGridView accepts columnindex and rowindex only in the form of integer. Is there any way in which I can use long instead of integer.
View 2 RepliesTrying to upload a picture file from an online source and store it in a byte array but am having the error: "Number of Indices is less than the number of dimensions in the indexed array".
Dim Bytes() as Byte
Dim Inet1 as System.Net.Webrequest
Why does casting a boolean to a byte in .NET give the following output?
Code Snippit:
Dim x As Boolean = 1
Dim y As Byte = x 'Implicit conversion here from Boolean to Byte
System.Diagnostics.Debug.Print( _
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Why does True (which commonly is referred to as an integer representation of 1) convert to 255 when casted to a byte?
I'm reading bytes from a serial port but need to convert them to signed, 8-bit integers (SByte).Unfortunately, the overflow checking in VB prevents a Byte value of 255 from becoming -1 in an SByte. So, essentially, I want to do the following:
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I have the following code:
Private Function SizeLogo(ByVal logoBytes As Byte()) As Byte()
Using originalMemStream As MemoryStream = New MemoryStream(logoBytes),
originalImage As System.Drawing.Image = System.Drawing.Image.FromStream(originalMemStream)
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What I am trying to do is
Create 300width and 200height white bitmap Draw and center image that was uploaded into center
My problem is I am unable to save the created image. Is this a conversion issue? I've highlighted code where I think I am failing at.
I am sending data to some microchips with a serial port control using:
Code:
well, it work up to the value 9, but anything with more that one decimal place sends a byte value of the rightmost digit. So, 16 in the text box will send 6. Basically, it appears to be sending just 6, or 1 followed by 6. Is this how the serial port sends data...one digital at a time? Or, is the conversion to a byte failing?
I have a Generic List of Bytes with Hexadecimal values stored in it. for example, elements 0 to 3 contain 42 9E D1 EC which as a single, is equal to 79.41. I've tried using:
dim foo as string = ""
for i as integer = 0 to 3
foo = foo + system.convert.tosingle(byteArray(i)).ToString
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I am using the .NET Framework 2.0, and I am trying to code a client bot for a game called Minecraft, Originally written in Java, there have been quite a few people who have made custom multi-player servers for this game, Primarily in C#, or in a language that i've never heard of, such as Pascal.I'm looking right now at sending this:
Packet ID: 0x00 (0) As Byte
Protocol Version: 0x07(7) As byte
Username: "umby25" As String
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"Byte cannot be converted to 1-Dimensional array of byte"
I don't understand why this whole thing would work in all of the other programming languages, but not Visual basic.I have tried converting the string using the same method that one of the open source C# servers used, and it failed, telling me that the dictionary does not contain that or something.
I'm converting a stream of bytes from a network packet into a specific struct, and vice versa. For example, when converting a short back and forth, my method looks like this:
myShort = buf(0) + (buf(1) * 256)
or the other direction:
buf(0) = myShort mod 256
buf(1) = myShort 256
When it comes to a 4 byte integer, after some experimentation I found that converting from the byte array to integer is done this way:
myInt = buf(0) + (buf(1) * 256) + buf(2) + (buf(3) * 256)
Basically adding two shorts together. I'm not quite sure to do the reverse of that, to fill the 4 bytes from myInt.
I am working on a mini project that requires me to take a 8 byte hex string that I received from the Serial Port and convert it into a Byte Array and display it on the screen.An example of the string that I receive is 01050001FFFF8FFB
I am currently using the System.Text.ASCIIEncoding.ASCII.GetBytes(str) to help me achieve this. However I realised that if this does not support extended ASCII so whatever byte that is > 7F, I will not get the right value.My current code is as follows:
vb
Private Sub SerialPort1_DataReceived(ByVal sender As Object, ByVal e As System.IO.Ports.SerialDataReceivedEventArgs) Handles SerialPort1.DataReceived
Dim str As String
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I have a hexadecimal value
07A5953EE7592CE8871EE287F9C0A5FBC2BB43695589D95E76A4A9D37019C8
Which I want to convert to a byte array. Is there a built in function in .NET 3.5 that will get the job done or will I need to write a function to loop through each pair in the string and convert it to its 8-bit integer equivalent?
Is there a way to convert byte values to binary so i can read the values from the bits themselves? I have some byte whose values are 00 09 and I'd like to convert the values to bits to be like this : 0000 0000 0000 1001. Then I'd like to read the value of first 2 bits and the remaining 14 bits separately.
View 10 RepliesWhat do i need to do to convert a recieved byte from Ascii to String, so i could display it properly on a textbox?
View 16 RepliesHow would I convert the two individual byte values (in hex) to a decimal value representing the concatenated hex values? For example, if I have the
Dim byte1 As Byte = &H99
Dim byte2 As Byte = &H99
' I want the decimal representation of the hex value "9999" ' (byte1.ToString + byte2.ToString) which should be "39321" Currently I use the following code:
Dim decVal as integer
decVal = Val("&H" + Hex$(byte1).ToString + Hex$(byte2).ToString)
However, when I use this, the value (decVal) comes out to "-26215"
I am needing to write data to a usb device. The USB device uses a byte array (DataArray() as byte) to store the data. How can I assign a struct object (myStruct(0)) to the byte array. I run into the error "Value of type byte cannot be converted to 1-dimensional array of byte" when I try to cast the struct as a byte.
View 10 RepliesI'm calling a Windows API that gives me a byte array which represents a unicode string - the problem is that if I call Text.Encoding.ASCII.Get String on it I just get the first letter of the string. The reason for this is that byte array has an empty byte between each character. I've verified that removing these empty bytes resolves the problem by just using a simple For loop to add the bytes that do have a value in into a new byte array, then calling Text.Encoding.ASCII.GetString on that and that gives me the full string I'm expecting.I'm just wondering if there is any easier way of getting the working string though without having to do a loop and create a new byte array etc?
View 2 Repliesconverting the number of frames (in a video) to a number/time format. For instance, say a video has 110,212 frames at 23.976 fps, it works out to 01:16:36 (hh:mm:ss) with 18 frames remaining. I would like to format the result in a Textbox like the following:
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How to convert memorystream byte array to csv file. I have GetExport method that converts rpt file to excelformatted memorystream and then returns that as a byte array. Is there a way to convert this byte array to a csv file? Due to some reasons I can only pass this byte array back to calling function.
Public Function GetExport(ByVal reportID As ReportID) As Byte()
Dim byteArray As Byte() = Nothing
Using expRptDoc As ReportDocument = New ReportDocument()
Dim rptFileName As String = Server.MapPath(ReportCommand.GetXMLReportPath(reportID))
expRptDoc.Load(rptFileName)
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I am looking for something that will convert a byte array to a string and back, anything in-build that does it as this method would:
To string:
vb
Dim b = ByteArrSerialize(Obj, Compress, EncryptKey)
Dim sb As New System.Text.StringBuilder
For Each item In b
sb.Append(Chr(item))
Next
To byte:
vb
Dim b(0 To Len(TheString) - 1) As Byte
Dim bCount As Long = 0
For Each item In TheString
b(bCount) = Asc(item)
bCount += 1
Next
i do not know why data type image on ms sql is not working ! so i choose to use varchar(max) as my datatype to store images.. but i do now know how to load it on crystal report..
View 1 RepliesI can't seem to find how to recast a char to Ascii, the VB6 way was to ASC(thechar/thestring).What is the new method? or how to perform the recast while converting to a byte so it will fit and not buffer overrun.
View 10 RepliesWe can declare a byte variable like this, for hex '88'
Dim bytes = New Byte() { &H88 } My case, 88 is assigned to a variable, hexvalue
How to declare the byte with the variable hex value?
Dim bytes = New Byte() { &H & hexvalue }the above throws syntax error.
I'm trying out a program which I found on the net. Why is it necessary to put to curly braces at the end of the statement? It gives an error: "Byte has no constructors". Dim data As Byte() = New Byte(1023) {} I can't put the code like this either, it produces the error "byte cannot be a 1-dimensional array".
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I have a variable as a single. what is the value of second byte of my variable.or what is the value of third byte of my variable value in memory.?in c language we use at like this *(char(&x)+1)which method do the same thing in vb.net
View 1 RepliesHow can I convert a number with exponent value (such as 4.775900000000000e+004 ) to return a whole number, such as 47,759 using .net2.0 framework? FYI, this is a weight category, not currency.
View 1 RepliesHow can I do for converting 3 in "three". Or converting for example 153 in "one hundred fifthy tree"
View 7 RepliesI have a byte variable that stores picture. How to clear the value of this variable.#
View 2 Replies