Converting byte[] to float the value become NaN even there is value existing.

I tried from the online Sample but,
Array.Reverse(data, index * 4, 4);
result = BitConverter.ToSingle(data, index * 4);
When the condition index*4>data.length it will through exception.
Thanks,

Hi sasikumar.93,
In C# the NAN is related to this:
https://msdn.microsoft.com/en-us/library/system.double.nan(v=vs.110).aspx and also
https://msdn.microsoft.com/en-us/library/system.single.nan.aspx
Maybe the convert here becomes NaN field which raised the exception.
Best regards,
Barry
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HT201250 I don't store any files on my computer, I store them on a hd. Can I restore docs from my hard drive if they were backed up using time machine? And will it restore if the hd isn't even there? Like what if it got stolen or destroyed.

I don't store any files on my computer, I store them on a hd. Can I restore docs from my hard drive if they were backed up using time machine? And will it restore if the hd isn't even there? Like what if it got stolen or destroyed.

ehphotograph wrote:
Can I restore docs from my hard drive if they were backed up using time machine?
Yes.
And will it restore if the hd isn't even there? Like what if it got stolen or destroyed.
Also yes.
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Message was edited by: Pondini

Converting Byte [] into float []

Hi, I read the contents of a file into a byte array and am now trying to convert it into a float array.
here is the code I am using
public static float [] bytetofloat(byte [] convert){
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any advice on this or a better way to do it would be much appreciated.

ultiron wrote:
I'm pretty sure they do. The way im doing it is by taking 2 byte values and changing them to a 16 bit float.
the way the bytes are shift they should only take up 16 bits.It's not that simple.
First, a float in Java is always 4 bytes. The fact that it has an integer value that can fit into two bytes is irrelevant
Second, floating point representation is not the same 2s complement that's used for byte, short, int, and long, so you're not just shifting the bits.
For eample:
1, int: 00000000 00000000 00000000 00000001
1, float: 00111111 10000000 00000000 00000000
-1, int: 11111111 11111111 11111111 11111111
-1, float: 10111111 10000000 00000000 00000000Having said that, you're casting, so your step of going from short to float is correct. It doesn't just shift; it does conversions like the above. The caveats are:
1) Is your conversion from bytes to short correct? That depends on what those bytes are supposed to be. If they're big-endian representations of 2-byte, 2s-complement numbers, then your code looks correct. You'll still have to test it of course. You'll want to focus on corner cases.
00 00 --> 0
00 01 --> 1
10 00 --> 4096
7f ff --> 32767
80 00 --> -32768
ff ff --> -1
2) Can float hold all of short's values? I think it can. It obviously can't hold all of int's values, but I think it's precision is sufficient to cover short.
By the way, is there a reason you're using float instead of double? Unless you're in an extremely memory-constrained environment, there's no reason to use double.

Strange issue with POF: byte array with the value 94

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Pof object code:
package com.test;
import java.io.IOException;
import java.util.Arrays;
import com.tangosol.io.pof.PofReader;
import com.tangosol.io.pof.PofWriter;
import com.tangosol.io.pof.PortableObject;
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Using writer.writeObjectArray(0, byteArray); instead of writer.writeObject(0, byteArray); doesn't help. In this case byteArray would be of type Object[] (as accessed through reflection).
This is simply put in to a distributed cache and then fetched back. No EPs, listeners or stuff like that involved:
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Only tried it with Coherecne 3.7.1.3.
Cache config file:
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<!DOCTYPE cache-config SYSTEM "cache-config.dtd">
<cache-config>
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<pof-config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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Hi,
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JK

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How do i get the value of that field

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String value =reques.getparameter (//what ??);

i dont want to change the jsp.
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Message was edited by:
Unknown_Citizen

New@SSIS - Excel Src: The value could not be converted because of a potential loss of data

Good day,
I am currently working on a SSIS package that had been built by a previous user. That Package allows me to import data from an excel source to a SQL table. The excel sheet holds multiple columns, However I am having difficulty with one
column when running the package.
The column rows hold a character and an integer (eg: N2). The data types are as follows:
SQL – varchar(3),NULL
SSIS - double-precision float [DT_R8]
I then inserted a data conversion task to change the data type. The task holds the following properties:
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Data Type – string[DT_STR]
Length – 50
When I execute the package I receive the following error:”
[Excel Source Data [76]] Error: There was an error with output column "F6" (91) on output "Excel Source Output" (85). The column status returned was: "The value could not be converted because
of a potential loss of data.".
I do know that usually the message "The value could not be converted because of a potential loss of data." refers to a data type or length problem.
Further insight to this problem will be much appreciated.

Hi Zahid01,
From the error message you post, we can infer the issue is caused by the input column “F6” cannot convert to the output column in Excel Source.
Based on my test, I can reproduce the issue in my environment. The exactly cause is the data type of input column “F6” cannot convert to the data type of corresponding output column. For example, the data type of input column “F6” is [DT_STR], the data type
of corresponding output column is [DT_I4], and there are some nonnumeric values in the input column “F6”. When we execute the task, the error occurs. We can verify the issue in the Advanced Editor dialog box of Excel Source. The following screenshot is for
your reference:
To avoid this issue, please make sure the input column can convert to the output column in Excel Source, including all the values in the input column.
If there are any other questions, please feel free to ask.
Thanks,
Katherine Xiong
Katherine Xiong
TechNet Community Support

How to update a large (over 4 million item) List(Of Byte) quickly by altering indexes contained in a Dictionary(Of Integer, Byte) where the Dictionaries keys are the indexes in the List(Of Byte) that need to be changed to the values for those indexes?

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La vida loca

Monkeyboy,
That was quite a bit to read, but still a bit unclear. Could you put a specific list of goals/questions, asked in the smallest possible form?
It seems like either you're making a program that monitors activity on your computer, or you're writing some kind of remote pc app.
When you do get your bytes from using lockbits, keep in mind all the files header info would be lost. I think retaining the header info is worth the extra bytes.
The other, thing: I'm not sure if you're taking 32bpp screen shots, but also keep in mind that the "whole desktop" is the final destination for blended graphics, if that makes sense. What I mean is that there is no need to capture an "alpha"
channel for a desktop screenshot, as alpha would always be 255, this could save you 1 byte per pixel captured... Theres nothing "behind" the desktop, therefore no alpha, and every window shown above the desktop is already blended. I suggest using
24Bpp for a full screen capture.
Your X,Y information for the mouse could be stored as UINT16, this would save you a measly 2 bytes per location update/save.
When you update your byte arrays, maybe you can turn the array into a stream and write to whatever index, however many bytes, that should prevent a "Shift" of bytes, and instead overwrite any bytes that "get in the way".
ex
Dim example As String = "This is an example."
Dim insertString As String = "was"
Dim insertBytes As Byte() = System.Text.Encoding.ASCII.GetBytes(insertString)
Dim bytes As Byte() = System.Text.Encoding.ASCII.GetBytes(example)
Dim modifiedBytes As Byte() = {}
Using ms As New System.IO.MemoryStream(bytes)
ms.Position = 5
ms.Write(insertBytes, 0, 3)
modifiedBytes = ms.ToArray
End Using
Dim newString As String = System.Text.Encoding.ASCII.GetString(modifiedBytes)
'Notice how below there isn't the word "is" anymore, and that there isn't a
'space.
'This demonstrates that you overwrite existing data, versus shifting everything to
'the right.
'Returns: This wasan example.
MsgBox(newString)
“If you want something you've never had, you need to do something you've never done.”
Don't forget to mark
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*This post does not reflect the opinion of Microsoft, or its employees.
Well it's too much to read. I was really tired when I wrote it. Even the below is too much to read but perhaps gets the point across of what I would like to do which I think
Joel Engineer may have answered but I'm not sure. As I'm still too tired to understand that yet and research what he said in order to figure it out yet.
But maybe the code below can provide the concept of the operation with the comments in it. But seeing as how I'm still tired it may be confused.
Option Strict On
Imports System.Windows.Forms
Imports System.IO
Imports System.IO.Compression
Imports System.Drawing.Imaging
Imports System.Runtime.InteropServices
Public Class Form1
Dim Bmp1Bytes As New List(Of Byte)
Dim Bmp1BytesCompressed As New List(Of Byte)
Dim Bmp2Bytes As New List(Of Byte)
Dim BmpComparisonDict As New Dictionary(Of Integer, Byte)
Dim BmpDifferenceIndexesCompressed As New List(Of Byte)
Dim BmpDifferenceBytesCompressed As New List(Of Byte)
Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
SomeSub()
End Sub
Private Sub SomeSub()
' Pretend this code is in UDP Client app. A screen capture is performed of the desktop. Takes about 90 milliseconds.
Bmp1Bytes.Clear()
Using BMP1 As New Bitmap(Screen.PrimaryScreen.Bounds.Width, Screen.PrimaryScreen.Bounds.Height)
Using g1 As Graphics = Graphics.FromImage(BMP1)
g1.CopyFromScreen(0, 0, 0, 0, BMP1.Size)
Cursor.Draw(g1, New Rectangle(Cursor.Position.X, Cursor.Position.Y, Cursor.Size.Width, Cursor.Size.Height))
Using MS As New MemoryStream
BMP1.Save(MS, System.Drawing.Imaging.ImageFormat.Bmp)
Bmp1Bytes.AddRange(MS.ToArray)
End Using
End Using
End Using
Bmp1BytesCompressed.AddRange(Compress(Bmp1Bytes.ToArray))
' UDP Client app sends Bmp1BytesCompressed.ToArray to UDP Server which is the entire image of the desktop that the UDP
' Client is on. This image takes awhile to send since compressed it is about 177000 bytes from over 4000000 bytes.
' I will be using different code just to get the bytes from the actual Bitmap in the future. That is not important for now.
' Pretend the UDP Server has received the bytes, decompressed the array received into a List(Of Byte) and is displaying
' the image of the UDP Clients desktop in a PictureBox.
' Now the image on the UDP Clients desktop changes due to the mouse cursor moving as an example. Therefore a new Bitmap
' is created from a screen capture. This takes about 90 milliseconds.
Bmp2Bytes.Clear()
Using BMP2 As New Bitmap(Screen.PrimaryScreen.Bounds.Width, Screen.PrimaryScreen.Bounds.Height)
Using g1 As Graphics = Graphics.FromImage(BMP2)
g1.CopyFromScreen(0, 0, 0, 0, BMP2.Size)
Cursor.Draw(g1, New Rectangle(Cursor.Position.X, Cursor.Position.Y, Cursor.Size.Width, Cursor.Size.Height))
Using MS As New MemoryStream
BMP2.Save(MS, System.Drawing.Imaging.ImageFormat.Bmp)
Bmp2Bytes.AddRange(MS.ToArray)
End Using
End Using
End Using
' Now I have the original images bytes in Bmp1Bytes and the new images bytes in Bmp2Bytes on the UDP Client. But I don't
' want to send all of the bytes in Bmp2Bytes to the UDP Server. Just the indexes of and the bytes that are different in
' Bmp2Bytes from Bmp1Bytes.
' This takes less than 100 milliseconds for what I've tested so far where over 500000 bytes in Bmp2Bytes are different
' than the bytes in Bmp1Bytes. Usually that amount would be much less. But during testing I was displaying the image
' from Bmp1 bytes in a PictureBox so a large amount of data would change between the first screen shot, the PictureBox
' then displaying an image on the same PC and then the second screen shot.
BmpComparisonDict.Clear()
For i = 0 To Bmp1Bytes.Count - 1
If Bmp1Bytes(i) <> Bmp2Bytes(i) Then
BmpComparisonDict.Add(i, Bmp2Bytes(i))
End If
Next
' So now I have all the difference bytes and their indexes from Bmp2Bytes in the BmpComparisonDict. So I compress
' the indexes into on List and the Bytes into another List.
BmpDifferenceIndexesCompressed.Clear()
BmpDifferenceBytesCompressed.Clear()
BmpDifferenceIndexesCompressed.AddRange(Compress(BmpComparisonDict.Keys.SelectMany(Function(d) BitConverter.GetBytes(d)).ToArray()))
BmpDifferenceBytesCompressed.AddRange(Compress(BmpComparisonDict.Values.ToArray))
' Now pretend the UDP Client has sent both those arrays to the UDP Server which has added both decompressed arrays
' to a Dictionary(Of Integer, Byte). And the server has the original image decompressed bytes received in a List
' called Bmp1Bytes also.
' This is where I am stuck. The UDP Server has the Dictionary. That part was fast. However there is no
' fast method I have found for creating a new List(Of Byte) where bytes in the originally received List(Of Byte) that
' do not have to be altered are placed into a new List(Of Byte) except for the indexes listed in the
' Dictionary(Of Integer, Byte) that need to be placed into the appropriate index locations of the new List(Of Byte).
' The below example for doing so is exceptionally slow. Pretend UpdateDictionary has all of the decompressed indexes
' and bytes received by the UDP Server for the update contained within it.
Dim UpdateDictionary As New Dictionary(Of Integer, Byte)
Dim UpdatedBytes As New List(Of Byte)
Dim Counter As Integer = 0
For i = 0 To Bmp1Bytes.Count - 1
If i = UpdateDictionary.Keys(Counter) Then ' Provides the index contained in the Keys for the Dictionary
UpdatedBytes.Add(UpdateDictionary.Values(Counter))
Counter += 1
If Counter > UpdateDictionary.Count - 1 Then Counter = 0
Else
UpdatedBytes.Add(Bmp1Bytes(i))
End If
Next
' So what I'm trying to do is find an extremely fast method for performing something similar to what the
' above operation performs.
End Sub
Private Function Compress(BytesToCompress() As Byte) As List(Of Byte)
Dim BytesCompressed As New List(Of Byte)
Using compressedStream = New MemoryStream()
Using zipStream = New GZipStream(compressedStream, CompressionMode.Compress)
zipStream.Write(BytesToCompress, 0, BytesToCompress.Count)
zipStream.Close()
BytesCompressed.AddRange(compressedStream.ToArray)
End Using
End Using
Return BytesCompressed
End Function
Private Function Decompress(BytesToDecompress() As Byte) As List(Of Byte)
Dim BytesDecompressed As New List(Of Byte)
Using DecompressedStream = New MemoryStream()
Using zipStream = New GZipStream(DecompressedStream, CompressionMode.Decompress)
zipStream.Write(BytesToDecompress, 0, BytesToDecompress.Count)
zipStream.Close()
BytesDecompressed.AddRange(DecompressedStream.ToArray)
End Using
End Using
Return BytesDecompressed
End Function
End Class
La vida loca

How do I convert the ASCII character % which is 25h to a hex number. I've tried using the scan value VI but get a zero in the value field.

How do I convert the ASCII character % ,which is 25h, to a hex number 25h. I've tried using the scan value VI but I get a zero in the value field.

You can use String to Byte Array for this.

Hi, how can i break the value for a row and column once i have converted the image to the array???????

Hi, I would like to know how can i break the value for a row and column once i have converted the image to the array. I wanted to make some modification on the element of the array at a certain position. how can i do that?
At the moment (as per attachhment), the value of the new row and column will be inserted by the user. But now, I want to do some coding that will automatically insert the new value of the row and the column ( I will use the formula node for the programming). But the question now, I don't know how to split the row and the column. Is it the value of i in the 'for loop'? I've tried to link the 'i' to the input of the 'replace subset array icon' , but i'm unable to do it as i got some error.
Please help me!
For your information, I'm using LABView 7.0.

Hi,
Thanks for your reply.Sorry for the confusion.
I manage to change the array element by changing the row and column value. But, what i want is to allow the program to change the array element at a specified row and column value, where the new value is generated automatically by the program.
Atatched is the diagram. I've detailed out the program . you may refer to the comments in the formula node. There are 2 arrays going into the loop. If a >3, then the program will switch to b, where if b =0, then the program will check on the value of the next element which is in the same row with b but in the next column. But if b =45, another set of checking will be done at a dufferent value of row and column.
I hope that I have made the problem clear. Sorry if it is still confusing.
Hope you can help me. Thank you!!!!
Attachments:
arrayrowncolumn2.JPG ‏64 KB

Truncate / Trim and Convert the values while importing in Import Manager

Hi,
I am facing the following issues while importing the values in Import Manager.
1) The incoming value is a 4 character text value (e.g. D004) and i need to truncate the 1st two characters so that i get the output as "04" and map it to the destination numeric 2 character field.
Can any1 help me on this as to how can i truncate the 1st two characters?
2) My incoming value is a numeric field which is coming from ECC. this value can be negative as well. the ECC sends this value as (78.00-) ie the minus sign is suffixed to the value but in MDM i need it as (-78.00) ie minus sign prefixed to the value.
Is there any setting in Import manager where i can set the minus sign as a prefix?
Useful answers will be rewarded with points.
Regards,
Roshani

Hi Roshani,
Can any1 help me on this as to how can i truncate the 1st two characters?
As suggested by everyone, none of these options will work. Since your field has alphanumeric Value i.e. D004. Use Option Replace.
After mapping your source field with target field which must be of Type TEXT, Right click on your source field>Set Value Conversion filter>Replace..-->a pop up window will come Replace write Find What: D0 and Replace with: keep it blank(dont write anything) and then Press Ok, you will see all your Source values D0XX converted to XX and then can save in Import Map which will give you the desired result.
If you set your target field of type INTEGER, you cant have option Replace. And the TRUNCATE option as suggested by everyone will not work as Operand 2: you can set as Numeric values only, you would not able to write D.
Is there any setting in Import manager where i can set the minus sign as a prefix?
I dont think this is possible alone with Import Manager, you need MDM workflow for this where your workflow trigger action = Record Import in Data Manager, and need to select the same workflow in configuration options of Import Manager>Import>checkout/workflow = select the workflow name from drop-down which you set in Data Manager and then need to save this in your Import Map. So in this manner whenever record comes through import Manager, these records automatically will go through this Workflow and will give you the desired result.
START(CHECKOUT)>Assign>STOP(CHECKIN)
Assign step where you give assignment on this field and write assignment expression as:
IF(FIND(XXX, "-"), "-"&LEFT(XXX, (LEN(XXX)-1)), XXX)
where XXX = Field name which you defined in MDM repository.
Regards,
Mandeep Saini

Converting byte[] to float the value become NaN even there is value existing.

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