Asp.net - Converting Bitmap To Byte
May 9, 2012
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)
[Code]....
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.
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May 6, 2007
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
[Code]....
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.
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Oct 7, 2009
How to convert byte to bitmap
Dim ScreenshotBytes As Byte() = MySQLExecuteReader("SELECT Screenshot FROM Connections WHERE Connection='EC8C35F2'", "Screenshot")
Dim ScreenshotMemoryStream As System.IO.MemoryStream = New System.IO.MemoryStream(ScreenshotBytes)
[Code] .....
But I don't know how to get the bytes from the mysql server:
Public Function MySQLExecuteReader(ByRef StrCmdText As String, ByRef StrColumn As String)
'On Error Resume Next
Dim MySQLComm As New MySqlCommand(StrCmdText, Connection)
[Code] .....
I want to return the byte from the column: "Screenshot" which is an image (MEDIUMBLOB) so I can use it as a background for a picturebox.
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Nov 27, 2009
I am searching for some code to help me take the bitmap contents of picturebox1 and convert it into an icon (*.ico) to save. I cannot for the life of me find anything to accomplish this. There are all sorts of codes that do things like convert bitmap files to icon files but nothing to change the contents of a picturebox as an icon.
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Feb 23, 2010
I have made an application with a client, server and listener. The server is a console app and the other two are Windows Forms Applications.
Basically i am using a Network Stream to send messages from the client which go through the network to the server which bounces them to the listener which then reads the message and tells the app what to do. (For example if i sent "shutdown", the listener would read it and then execute "shell(shutdown -s)".
The messages are sent like the following SendMessage("shutdown") but when i use a screen capturing API and send from the listener to the client like so SendMessage(background) i get the following error:
Quote:
Value of type 'System.Drawing.Bitmap' cannot be converted to 'String'.
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Feb 17, 2011
I have an application which take image from a folder through system, Io.filestream and convert it into bytes and store into database as byte data format and same I retrive from database as byte format and convert it into image into datagirdview. now I want to convert it into again bytes from datagridview. How to possible the value of image in datagridview into byte format.
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May 1, 2009
I have a SQLite database which is running on a handheld which is capturing signatures using OpenNetCF's Smart Device Framework 2.1 running under Windows Mobile 6.1. The signatures are captured from the Signature control using the GetSignatureEx method and stored in the database.
What I want to do now is reconstitute the signatures on the desktop, but the desktop does not have a similar control. I looked at the data and it looks like a bunch of vectors, which explains why the data is so compact.
how I can convert the data into a bitmap on the desktop using VB.NET.
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Feb 9, 2012
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( _
[Code].....
Why does True (which commonly is referred to as an integer representation of 1) convert to 255 when casted to a byte?
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Feb 24, 2012
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:
[Code]...
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Jun 28, 2010
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?
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Feb 7, 2010
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
[code].....
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Mar 10, 2010
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
[code].....
"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.
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Oct 26, 2009
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.
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Mar 8, 2011
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
[code]....
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Aug 26, 2009
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?
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May 25, 2009
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.
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May 17, 2011
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.
[Code]...
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Aug 11, 2009
What do i need to do to convert a recieved byte from Ascii to String, so i could display it properly on a textbox?
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Apr 25, 2011
How 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"
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May 25, 2012
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.
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Jun 9, 2010
I'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?
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Sep 26, 2011
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)
[Code] .....
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Mar 4, 2012
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
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Apr 8, 2012
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..
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Sep 28, 2010
I 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.
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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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May 23, 2010
I've been trying to figure this out for hours now, and I've given up on trying to solve it myself. Basically what I need to do, is convert a "double octet" binary string, such as "11010011 01011101", into a byte or char type if possible.I use the following code to convert my Unicode text into binary:
Private Function ByteToStr(ByVal bt() As Byte) As String
Dim st As New StringBuilder
For Each byt As Byte In bt
[code]....
But that gives me weird results. The "Convert.FromBase64String" obviously isn't what I'm after. Any help would be great. If I can convert the "binary string" into a bytes or chars I can get it into a string.
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Jan 21, 2011
I am in the process of converting some c# code to that of VB.NET...I am running into error at the following
[Code]...
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May 23, 2010
I've been trying to figure this out for hours now, and I've given up on trying to solve it myself. Basically what I need to do, is convert a "double octet" binary string, such as "11010011 01011101", into a byte or char type if possible. I use the following code to convert my Unicode text into binary:
[Code]...
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Aug 29, 2009
I am trying to communicate with an external device and i am trying to send a byte array to the external device via sockets but i am always getting a response the message size is too small so i am not sure what i have done wrong. Between the data type there should be no alignment present and all numbers are represented in little endian format. The char array is not null terminated as mentioned in the protocol specifications.
I have to send data based on a struct that embeds 2 other struct. So here's my vb.net code for the struct used to convert to byte array and the sending part.
Public Structure MESSAGETYPE_OIP_Login
Dim Header() As COMMANDHEADER
Dim UserName() As PSTRING
[Code]....
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