Convert Byte-array To Object?

Aug 16, 2010

in my project I use an Excel workbook as template. Right now, this workbook is located in the same directory as the exe-assembly and can be opened and manipulated by the user. To avoid this, I thought about adding the workbook to a ressource. That works. Problem: how can I convert the resulting byte-array/stream back to a workbook-object?I tried like this, but - obviously - the conversion fails:

Public Shared Sub test()
Dim wkb As Excel.Workbook
Dim bytes As Byte() = My.Resources.Template_1

[code]....

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I didn't think it fair to post a comment on Fredrik Mörk's answer in this 2 year old post, so I thought I'd just ask it as a new question instead..NB: This is not a critiscm of the answer in any way, I'm simply trying to understand this all before delving into memory management / the marshal class.

In that answer, the function GetByteArray allocates memory to each object within the given array, within a loop.Would the GetByteArray function on the aforementioned post have benefited at all from allocating memory for the total size of the provided array:

Dim arrayBufferPtr = Marshal.AllocHGlobal(Marshal.SizeOf(<arrayElement>) * <array>.Count)

I just wonder if allocating the memory, as shown in the answer, causes any kind of fragmentation? Assuming there may be fragmentation, would there be much of an impact to be concerned with? Would allocating the memory in the way I've shown force you to call IntPtr.ToInt## to obtain pointer offsets from the overall allocation pointer, and therefore force you to check the underlying architecture to ensure the correct method is used*1 or is there a better way? (ToInt32/ToInt64 depending on x86/64?)

*1 I read elsewhere that calling the wrong IntPtr.ToInt## will cause overflow exceptions. What I mean by that statement is would I use:

Dim anOffsetPtr As New IntPtr(arrayBufferPtr.ToInt## + (loopIndex * <arrayElementSize>))

I've read through a few articles on the VB.Net Marshal class and memory allocation; listed below, but if you know fo any other good articles I'm all ears![URL]..

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[Code]...

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my code is

Response.Clear()
Response.ContentType = "application/pdf"
Response.AppendHeader("Content-Disposition", "inline;filename=data.pdf")

[Code].....

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Ok, I am tasked with changing certain text labels that exist within 1000's of CAD files. The only way to change the text labels, as of now, is to open each CAD file in a CAD editor, change the labels by hand, and save it as a new file name, and that will take forever.So, I want to make this job easier and to do that I need to write a program to do it automatically (not a Macro). So far, I have made an app that loads the CAD file's bytes, finds the position of the label's text bytes, and replaces the text bytes with my own bytes, and saves the file under a new name.The problem is, I don't know the format/encoding/whatever they used to write the string to bytes..... The good thing is, I have unlimited examples to learn from because I can use the CAD program to change the text and then see the results in Hex. I want MY program to mimic the results.Here is some hex examples;

13 BE FD F9 00 = wood
0F 1E 1E 80 = cat
0F 26 FC E0 = dog

[code]....

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I have a very simple question about converting a byte array into 16bit integers.† I am connected to a device through a serial port.† It sent me six bytes which represent three Int16 integers.† For example, the byte array is called newRecievedData(5) and has a length of 6.†

The manual that came with the device claims that the int Format is 8 bit MSB|8 bit LSB.† Does that mean the following?

newRecievedData(0) contains 8†high bits of the first Int16
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[Code]....

but VB.NET Express 2008 gives me the error that Error†1†Value of type '1-dimensional array of Byte' cannot be converted to 'Short'.

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0x74 0x24 0x94

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HEAD_TYPE Header type: 0x74
1 byte
HEAD_FLAGS Bit flags:

[code]....

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I have an activex control that outputs a template object to the client, which gets serialized to a byte array. My attempts to put this byte array in a hidden field for post back to the server have given mixed reults, in that the size of the byte array decreases when sent to the server. My best guess is that the byte array is being truncated when put into a (string) hidden field.

I convert the byte array to a HEX string on the client side before passing over to the server, then converting it back on the server - HEX to byte array. If found some examples of how to do this in C#, VB.net but I haven't a clue how to accomplish this on the client - vbscript, javascript, etc,

I'm guessing something like this would get it done on the server, but how would I accomplish this on the client side?

Private Function Bytes_To_String2(ByVal bytes_Input As Byte()) As String
Dim strTemp As New StringBuilder(bytes_Input.Length * 2)
For Each b As Byte In bytes_Input

[Code].....

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I m using encryption and decryption

When I use Return Convert.ToBase64String(ms.ToArray()), I can decrypt data by first Convert.FromBase64String(stringToDecrypt) and it works fine.

But if I dont use Base64string method when returning the data and use .Encoding.ASCII.GetString(ms.ToArray) and then try†to decrypt, I get "Bad data" error

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Convert Image To Byte Array?

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I'm trying to convert a image into a byte array for use in a msacces db.THis is the code I use but I can;'t get the byte array?

Imports System.IO
Public Class Form1
Private Sub Form1_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load

[code]....

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Structure Record
<VBFixedString(22),System.Runtime.InteropServices.MarshalAs(System.Runtime.InteropServices.UnmanagedType.ByValArray,SizeConst:=22)> Public tim() As Char

[code].....

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I'm trying to figure out how to†convert a string inot a byte array to send as a†packet over a socket. Initially it was used for serialport.write but I would like to use in
Socket.BeginSend(ByVal buffer() As Byte buildpacket()
Below†is taking a struct (listed at bottom) as an argument and building a string using†eg. Chr().

How can I†convert the output of†buildpacket(), eg. "yyyypyu"† into a†Byte().
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Dim temppacket As String
Dim checksum, i As Integer
'Build packet to Transmit
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[Code] .....

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I've created a new access 2007 database + added a OLE Object field, that i've then pasted images into.in vb2008 I've connected to the database + put the table into a datatable. so far it works ok.when i try to convert the byte array to an image, it causes an error:

'A first chance exception of type 'System.ArgumentException' occurred in System.Drawing.dll'heres the code i'm using[code]....

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vb
.SetValue("New Signature", Text.Encoding.Unicode.GetBytes("Taco"), Microsoft.Win32.RegistryValueKind.Binary)

[code].....

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[code]...

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[code]....

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[code]...

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<div class="body">

I have a word document data been inserted into database as VarBinary(max) column. Now, i need to fetch this information and display in my aspx page directly.I am getting this value from database in Byte Array and try to convert that into string and add that string to a div.I am using the below two ways: In both the ways first i am getting them to a temp txt(in 1st way) and doc (in 2nd way) files and reading back those file I am using .net 2.0 frame work

Write Method:Writing data to temp file(either doc or txt based on the filepath which has filename)
Eg: filepath: "c:temp.doc"
Public Sub writeFileData(ByVal strFilePath As String, ByVal bytFileData() As Byte)
Try

[code]....

Failure reasons: I am getting the output as some symbols, prob because the server is not able to read the format of the word content.how to read the word document data in binary data to a string.

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I have code and have tried several things but they don't seem to be working out.
Dim fileline As String = ""
Dim linebytes() As Byte = Nothing
Dim idx As Integer
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If Not (SoftwareUpdateFilestream Is Nothing) Then
[Code] .....

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i've created a new access 2007 database + added a OLE Object field, that i've then pasted images into.

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when i try to convert the byte array to an image, it causes an error:

'A first chance exception of type 'System.ArgumentException' occurred in System.Drawing.dll'

heres the code i'm using:

vb

Dim arr() As Byte = DirectCast(record.Item(5), Byte())
pic.Image = Image.FromStream(New IO.MemoryStream(arr))

its loading the byte array properly, but the Image.FromStream line causes the error. i've used this method before with an earlier access database + it works.

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I have a device with upon serial communication , it send the data as HEX values , (eg, C020042ABD0F91A103E400F929EBC) . I use the following code to get data from the serial port.

Dim fStream As New FileStream(sFileName, FileMode.CreateNew) ' creates new file
Dim bw As New BinaryWriter(fStream)
System.Threading.Thread.Sleep(1500)
ComTd.Read(data, 1, bCount)

[code]....

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I have a device with upon serial communication, it send the data as HEX values, (e.g., C020042ABD0F91A103E400F929EBC). I use the following code to get data from the serial port.

Dim fStream As New FileStream(sFileName, FileMode.CreateNew) ' creates new file
Dim bw As New BinaryWriter(fStream)
System.Threading.Thread.Sleep(1500)
ComTd.Read(data, 1, bCount)
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[Code] .....

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Code:
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But this only works for lower ascii characters (0-127).Instead of ASCIIEncoding I can specify encoding myself (System.Text.Encoding.Getencoding(encoding).GetBytes(sourcedata)). But I have to specify correct encoding in this case, otherwise most of special characters are converted to "?". What should I do if I don't know the encoding?

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Dim fs As New FileStream(Application.StartupPath & "Agency.dat", FileMode.OpenOrCreate)
Dim bf As New BinaryFormatter()
Call bf.Serialize(fs, GAgency)[code]....

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How can one convert†Object Array to†Byte Array

I dont know if i should be using Memory Stream, Buffer, etc.

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Friend Sub StartTablet()
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[code]....

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Is there a way I can convert the byte array into a string as if it arrived from the serial port?

I would prefer to rewrite a very long 'if statement' into byte array functions syntax that look like:

dim b as boolean = IsBitSet(state_buffer(i), j) 'rather than:

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I'm creating an emulator for a device to simulate wave forms. My challenge is that when I try to convert the output of the following code, I can't convert the Math.Sin's double output into byte values that lend themselves to the byte array format required by an existing graphing control as listed at bottom below. I''m not sure how to handle this when the sin function creates negative values but the byte values will need to be positive and basically 'shifted up' so that anything over 127 is negative. (0 - 255) unsigned. BitConverter.GetBytes has been suggested but THIS is the result of that attempt.

[Code]....

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Value type "Byte" cannot be converted into "1-dimensional array of byte"Does anyone know what is missing?

Option Strict On
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[code].....

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