How dose BigInteger translate a byte array

I dont know if this is obvious or not, but where can i find the algorithm used by BigInteger for translating byte/array of bytes into a number?

I dont know how, but you can have look in BigInteger source file.

Similar Messages

How to split the blob byte array and insert in oracle

how to split the blob byte array and insert in oracle
I am having a string which is of more than lenght 4000 so i am using BLOB datatype as input to get the string.
need to split the blob in oracle and store in the different column
The string is of bytearray i need to strore it in each column based on the byte array.

this will be my input i need to split the above and store it in different columns in a table.
for spliting say
Column1 -1 byte
Column2-3 byte
Column3-5 byte
ColumnN-5 byte
Table will have corresponding data type
Column1 - number(10,2)
Column2 - Float
Column3 - Float
ColumnN-Float
here Column2 datatype is float but it will always have 3 byte information.
where as Column3 datatype is also float but it will always have 5 byte information.
Say N is Column 120

How do I get a byte array from an object passed into the JNI?

This is what my java code looks like:
public class streamedData
protected byte[] m_value = null;
public byte[] getByteArray ()
return m_value;
/* code not pertaining to this question snipped. */
jclass streamedDataClass = env->GetObjectClass(jstreamedData);
// Get methodIDs for the various NPKI_Extension methods
value = env->GetMethodID(streamedDataClass, "getByteArray", "()[B");
lstreamedData->value = (unsigned char *)malloc (lstreamedData->length);
if (lstreamedData->value == NULL)
return INSUFFICIENT_MEMORY;
memset (lstreamedData->value, 0, lstreamedData->length);
memcpy (lstreamedData->value, env->CallByteMethodA(streamedDataClass, value, NULL), lstreamedData->length);
This is not working.
My question is, how do I get a copy of or read m_value in the JNI layer? Do I have to make the byte array public and access it as a field ID?
Any help would be appreciated. Why oh why can't there be a CallByteArrayMethod????

My question is, how do I get a copy of or read m_value in the JNI layer? Do I have to make the byte array public and access it as a field ID?
You can retrieve a handle to the byte array, through a method call, as you're doing now, or by directly accessing it through GetFieldID.
In the case of the method call, you'll want to do:jmethodID getByteArrayMethod = env->GetMethodID(streamedDataClass, "getByteArray", "()[B");
jbyteArray byteArray = static_cast<jbyteArray>( env->CallObjectMethod( jstreamedData, getByteArrayMethod ) );In the case of field access, you can do:jfieldID m_valueFieldID = env->GetFieldID( streamedDataClass, "m_value", "[B" );
jbyteArray byteArray = static_cast<jbyteArray>( env->GetObjectField( jstreamedData, m_valueFieldID ) );Once you have byteArray, you need to access it using the array operations:lstreamedData->value = env->GetByteArrayElements( byteArray, 0 );
// Do what you want to do, then release the array
env->ReleaseByteArrayElements( byteArray, lstreamedData->value, 0 );As always, Jace, http://jace.reyelts.com/jace, makes this easier. For example,void printByteArray( jobject jstreamedData ) {
streamedData data( jstreamedData );
JArray<JByte> byteArray = streamedData.m_value();
for ( int i = 0; i < byteArray.length(); ++i ) {
cout << byteArray[ i ];
}God bless,
-Toby Reyelts

How to make use of byte array to perform credit and debit in Wallet Applet

Hi,
Can anyone please explain me how to use the concept of byte arrays.. to perform credit and debit operations of a 6byte amount. Say for example.. the amount contains 3 bytes whole number, 1 byte decimal dot and 2 bytes fractional part.
It would be helpful if anyone could post a code snippet.. that way i can undersatnd easily.
Thanks in Advance
Nara

Hello
as explained in the other topic, remember your high school years and how you leart to add numbers.
then, reproduce these algorithms for base-256 numbers.
fractional? just google about fixed point math and floating point math. The first one is easier, as they are managed as integers.
example, you want to store 1,42€. Then you decide the real number to deal with is N*100, and you store 142. You get 2 decimal places of precision.
in the computer world it's easier to store n*256 as it's just a byte shift.
then the addition operations are the same, and you just interpret the values as fractional numbers.
regards
sebastien

How to publish self-composed bytes array as video ?

So far I only find the way to publish camera video as stream: attachCamera()
Is it possible to publish self-composed bytes array as video ?

i don't believe there's a way to inject bytes into a publishing NetStream and have it encapsulated as though it was a video message.
however, you could do NetStream.send("onVideoBytes", myBytes) at the publisher, and receiver(s) could, in their onVideoBytes() handler, use NetStream.appendBytes() on a different NetStream (connected to a video component) to display your generated video data.
using appendBytes() properly for this purpose is an exercise for the reader.
-mike

How do i clear a byte array?

Hi. I'm reading a different chunk of data each time and therefore need to clear the byte array before I go to the next chunk. I've seen
other ways through a buffer but that is too complicated for me to understand. Can u please tell me if there is a simple method in the API to clear it?
Thank you!!

well i thought it was, but i'm using the matcher class to read the data and storing it in a byte array of size 512 and it seems that when i convert it into a string, the previous data is still there if i read something less than 512
Edited by: angel32013 on Sep 16, 2008 1:08 PM

NetBeans MobilityPack 5 BUG?? how can I send a byte array?

I�ve created a WebApp and a Simple servlet with one public method.
public byte[] getStr(byte[] b) {
String s = "A string";
return s.getBytes();
Then I've used "Mobile To Web App" wizard to generate stubs to that getStr method. And when I�ve tried to call that getStr method:
byte[] aByte = "st".getBytes();
byte[] b = client.getStr(aByte);
I've got an error at Server in Utility.java in generated ReadArray method.
* Reads an array from the given data source and returns it.
*@param source The source from which the data is extracted.
*@return The array from the data source
*@exception IOException If an error occured while reading the data.
public static Object readArray(DataInput in) throws IOException {
short type = in.readShort();
int length = in.readInt();
if (length == -1) {
return null;
} else {
switch (type) {
case BYTE_TYPE: {
byte[] data = new byte[length];
in.readFully(data);
return data;
default: {
throw new IllegalArgumentException("Unsupported return type (" + type + ")");
At this line "in.readFully(data);" I�ve got an EOFException.
The the aByte = "st".getBytes(); was 2bytes long and at the server "int length = in.readInt();" it was 363273. Why?
All code was generated by NetBeans Mobility pack 5 it's not mine so its a bug?
How can I fix this?

I found that bug. I've described it here
http://www.netbeans.org/issues/show_bug.cgi?id=74109
There's a solution how to fix the generated code.

How to render an image (byte array) in a JSP

I don't know how to solve this:
I have a bean 'Details' with a property 'photo'
This bean is read in a servlet and put into session scope like this:
PhotoDetails Details = getPhotoDetail(some_id);
HttpSession session = request.getSession();
session.setAttribute("photo", Details);
Then I forward to a JSP, where properties of the bean are listed:
<bean:write scope="session" name="photo" property="photo_description" />
Till now, it works fine,
but now I want to display the 'photo' property. This fails ....
I try to do this:
<html:img src="/servlets/PhotoDisplayer" />
I use an html:img tag and I call a servlet which should stream the photo
to the JSP page. I hope the servlet pick the photo attribute from the
session.
Here is the PhotoDisplayer Class:
public class PhotoDisplayer extends HttpServlet {
public void doGet(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
PhotoDetails photoDetail = (PhotoDetail)
request.getSession(true).getAttribute("photo");
byte[] photo = photoDetail.getPhoto();
response.setContentType("image/jpg");
OutputStream os = response.getOutputStream();
BufferedOutputStream bos = new BufferedOutputStream(os);
bos.write(photo, 0, photo.length);
bos.close();
But nothin happens, I don't see a picture/photo on the JSP page.
If someone can help with this, I will appreciate that.
kind regards,
Harryvanrijn

Karthik:
It should not be difficult to debug what is exactly the cause of your problem.
Firstly, use your servlet to display an existing .jpeg or .jpg file that you know it is good.
If it is ok, then the problem lies in getting the image from the blob. To confirm it, you can try saving the image from the blob into a .jpeg file and viewing it through any graphic viewer, like the Windows accessory "paint".
If it is not ok, then the problem lies in your servlet or browser. Make an html that contains a link to your image. Save it to the disk as a .jpg file through the browser. Is it the same as the file saved from blob directly? View the file through a graphic viewer.
Well, that is the idea. Just try various variations and locate the exact place where it goes wrong in your situation. Please tell me if this helps or not.

I would like to know how i can save an byte array to a mat file format (matlab file format '*.mat') within to use the matlab API

So, I search the binary matlab file format('*.mat').

Title:
Moving Data Between MATLAB® and LabVIEW
Problem:
How can I share data between LabVIEW and the MATLAB environment?
Solution:
MATLAB users can move data between the
MATLAB environment and LabVIEW, you have several options. Prior to
LabVIEW 5.1, the only way to transfer data between these two
environments was to use the Save and Load functions. Those are discussed herein.
Beginning
in LabVIEW 8.0, MathScipt was introduced. MathScript is an integrated
part of LabVIEW that you can use to combine intuitive graphical
dataflow programming with math-oriented textual programming. See the
attached links below for more information on MathScript.
Beginning
in LabVIEW 5.1, the MATLAB script node was introduced into the LabVIEW
programming environment. The MATLAB script node makes ActiveX calls to
the MATLAB software from within LabVIEW. This requires that both MATLAB
be installed on the same machine and that a valid license is obtained.
More information on the MATLAB script node can be found in the attached
KB's.
For all versions of LabVIEW, this data transfer can be
performed by saving the data in a file using the MATLAB software and
reading it directly from LabVIEW, or vice versa. In the MATLAB
environment, the command "save" allows you to save the data in
binary format (*.mat) or ASCII format. You also have an option of
saving it in ASCII format using a tab delimiter between data points and
the command "load" allows you to read in the data.
ASCII Format
Complete the following steps to import or export data between LabVIEW and the MATLAB environment using an ASCII file format.
From the MATLAB environment to LabVIEW
To save a vector or a matrix X in tab-delimited ASCII format, enter the following in the command window or m-script file in the MATLAB environment:
>>SAVE filename X -ascii -double -tabs
This creates a file named filename containing data X in tab-delimited ASCII format.
Import the file into LabVIEW using the Read From Spreadsheet File VI located on the Functions»File I/O palette.
From LabVIEW to the MATLAB environment
To export a matrix X from LabVIEW to the MATLAB environment, first save the data in ASCII format in LabVIEW using the Write To Spreadsheet File VI on the Functions » File I/O palette.
Enter the following in the command window of the MATLAB environment, or in the m-script file:
>> LOAD filename
This reads the data into the MATLAB environment.
Binary Format
Complete the following steps to import or export data between LabVIEW and the MATLAB environment.
From the MATLAB environment to LabVIEW
As mentioned above, LabVIEW does not save multiple variables to one
data with extra manipulation, and will not be discussed here.
Therefore, the only way of sending the data from the MATLAB environment
to LabVIEW without tampering with the MAT binary file structure is
using the ASCII format. Also, please bear in mind that you need to have
one file for one variable.
From LabVIEW to the MATLAB environment
Because
the MATLAB software saves data in its own binary format, the "MAT"
file, binary LabVIEW data must be converted to this format prior to
transferring the data. The attached examples can be used to save
LabVIEW data in the MATLAB software format. The convenience of the .MAT
file format is that more than one variable can be saved in the same
file. The example shows saving seven variables to .MAT format; the
example can be modified for any number of variables.
Once this data is saved from LabVIEW, it can be read into the MATLAB environment, using the following command:
>>LOAD filename
The Who
command can then be used to display all the seven variable names, and
you can display the content of them by entering the variable names at
the command prompt as usual.
MATLAB® is a
registered trademark of The MathWorks, Inc. Other product and company
names listed are trademarks and trade names of their respective
companies.
| Michael K | Project Manager | LabVIEW R&D | National Instruments |

JDO : how to map a byte array field correctly

Could someone please provide an example on how to correctly map a byte array field in a PCClass.
The field should be mapped to a BLOB field in my Dictionary project.
The checker keeps throwing errors during the enhancement process. Tried all sorts of combinations of xml in my jdo and map file (using the dtd) but I still haven't found the solution. The compilation works fine though, it is only the checker that complains.

You're already in a PDF open in Acrobat (not the free Adobe Reader) and you've made a new PDF? Which you want to save to disk and reopen?

Sending a Byte array through a socket

Can someone please tell me how i can send a Byte array from a client to a sever using sockets?
Thanks
Mark

This tutorial should do the trick:
http://java.sun.com/docs/books/tutorial/networking/sockets/index.html

Populating byte array

Hi
I want to populate a byte array named data in such a way that its first element contains any digit between 1 and 9. Then from 2nd element till 8th element there would be a string and from 9th element till end (say 20th element), there would be another string. How can i populate my byte array in this way? One way to populate the array is to do it element by element but its bad when working with large strings.
Can anyone please help me???
Thanks

Now if i again convert bytemsg to String using
toString function, and print it, it gives garbage
value, not "Testing". Please can u tell me why it is
happening??Calling toString on an array does not show the contents of the String. See the String class constructors instead.
Kaj

How do I store an Int, a short, and multiple bytes from file in byte array

I'm attempting to do this for a project but can't figure out how to store the three values in one byte array. This is what i've tried
public void send(byte[] input)
          // TODO
          ByteArrayInputStream bais = new ByteArrayInputStream(input);
          ByteArrayOutputStream baos = new ByteArrayOutputStream();
          DataOutputStream dos = new DataOutputStream(baos);
          byte[] pData = new byte[100];
          try {
               dos.writeShort(checkSum);
               dos.writeInt(nextSeqNum);
               pData=baos.toByteArray();
               bais.read(pData);
          } catch (IOException e) {
          DatagramPacket dgp = new DatagramPacket(pData, pData.length);When i set pData=baos.toByteArray() it changes the size and then stops me from being able to read the other 94 bytes into the array to send. Any ideas?

You don't need the ByteArrayInputStream at all.
dos.writeShort(checkSum);
dos.writeInt(nextSeqNum);
dos.write(input);
pData = baos.toByteArray();
When i set pData=baos.toByteArray() it changes the sizeNo, it makes it refer to a new byte[] array containing what you've written to the BAOS. That's what it's supposed to do.

How to get a string or byte array representation of an Image/BufferedImage?

I have a java.awt.Image object that I want to transfer to a server application (.NET) through a http post request.
To do that I would like to encode the Image to jpeg format and convert it to a string or byte array to be able to send it in a way that the receiver application (.NET) could handle. So, I've tried to do like this.
private void send(Image image) {
    int width = image.getWidth(null);
    int height = image.getHeight(null);
    try {
        BufferedImage buffImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
        ImageIcon imageIcon = new ImageIcon(image);
        ImageObserver observer = imageIcon.getImageObserver();
        buffImage.getGraphics().setColor(new Color(255, 255, 255));
        buffImage.getGraphics().fillRect(0, 0, width, height);
        buffImage.getGraphics().drawImage(imageIcon.getImage(), 0, 0, observer);
        ByteArrayOutputStream stream = new ByteArrayOutputStream();
        JPEGImageEncoder jpeg = JPEGCodec.createJPEGEncoder(stream);
        jpeg.encode(buffImage);
        URL url = new URL(/* my url... */);
        URLConnection connection = url.openConnection();
        String boundary = "--------" + Long.toHexString(System.currentTimeMillis());
        connection.setRequestProperty("method", "POST");
        connection.setRequestProperty("Content-Type", "multipart/form-data; boundary=" + boundary);
        String output = "--" + boundary + "\r\n"
                      + "Content-Disposition: form-data; name=\"myImage\"; filename=\"myFilename.jpg\"\r\n"
                      + "Content-Type: image/jpeg\r\n"
                      + "Content-Transfer-Encoding: base64\r\n\r\n"
                      + new String(stream.toByteArray())
                      + "\r\n--" + boundary + "--\r\n";
        connection.setDoOutput(true);
        connection.getOutputStream().write(output.getBytes());
        connection.connect();
    } catch {
}This code works, but the image I get when I save it from the receiver application is distorted. The width and height is correct, but the content and colors are really weird. I tried to set different image types (first line inside the try-block), and this gave me different distorsions, but no image type gave me the correct image.
Maybe I should say that I can display the original Image object on screen correctly.
I also realized that the Image object is an instance of BufferedImage, so I thought I could skip the first six lines inside the try-block, but that doesn't help. This way I don't have to set the image type in the constructor, but the result still is color distorted.
Any ideas on how to get from an Image/BufferedImage to a string or byte array representation of the image in jpeg format?

Here you go:
private static void send(BufferedImage image) throws Exception
    ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
    ImageIO.write(image, "jpeg", byteArrayOutputStream);
    byte[] imageByteArray = byteArrayOutputStream.toByteArray();
    URL url = new URL("http://<host>:<port>");
    HttpURLConnection connection = (HttpURLConnection) url.openConnection();
    connection.setDoOutput(true);
    connection.setRequestMethod("POST");
    OutputStream outputStream = connection.getOutputStream();
    outputStream.write(imageByteArray, 0, imageByteArray.length);
    outputStream.close();
    connection.connect();
    // alternative to connect is to get & close the input stream
    // connection.getInputStream().close();
}

How to put a String into a byte array

How can i put a String into a byte array byte[]. So that i can send it to the serial port for output to an LCD display. Cheers David

javadocs for String
getBytes
public byte[] getBytes()
Encodes this String into a sequence of bytes using the platform's default charset, storing the result into a new byte array.
Returns:
The resultant byte arraySince:
JDK1.1

How dose BigInteger translate a byte array

Similar Messages

Maybe you are looking for