Byte array (byte[]) in session

Is it possible to put byte[] in servlet session? Is correct?
byte[] is it serializable? Is a object?

yes you can put byte array into session.

Similar Messages

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

Converting an integer to a byte array?

I have a checksum calculation and i stor it into an int. but when i saved to my test.dat file this number showd up as 05 in hex, which is only 1 byte out of 4 that is displayed. I have been looking around and playin and stuff but havent found anything helpful.
checksum(4 bytes) : 2126934821
// Stream access
FileInputStream fischar;
FileOutputStream outchar;
// CS byte array
byte [] orgCS = new byte[4];
//byte [] bnewCS = new byte[4];
int newCS;
public void writecss() {
System.out.print( "New checksum(" + 4 + " bytes) : "+newCS+"\n" );
try{
// writing original checksum and new checksum into a .dat file spaced with a zero
outchar = new FileOutputStream( fcs );
outchar.write(orgCS); // byte array being written
outchar.write(0);
outchar.write(0);
outchar.write(newCS); // Int being written
outchar.close();
System.exit(0);
}catch(IOException ioe){
// Print IO error
System.out.print( ioe );
System.exit(0);
the output is so
FD6E 945E 0000 F3 : .n.^...
you can see where the 2 zero bytes act like a spacer, and you see the integer being cut off for some reason. o_O can you help me out?

Not sure if this help you?
     * Writes the specified byte to this output stream. The general
     * contract for <code>write</code> is that one byte is written
     * to the output stream. The byte to be written is the eight
     * low-order bits of the argument <code>b</code>. The 24
     * high-order bits of <code>b</code> are ignored.
     * <p>
     * Subclasses of <code>OutputStream</code> must provide an
     * implementation for this method.
     * @param      b   the <code>byte</code>.
     * @exception IOException if an I/O error occurs. In particular,
     *             an <code>IOException</code> may be thrown if the
     *             output stream has been closed.
    public void write(int b) throws IOException
     * Writes <code>b.length</code> bytes from the specified byte array
     * to this output stream. The general contract for <code>write(b)</code>
     * is that it should have exactly the same effect as the call
     * <code>write(b, 0, b.length)</code>.
     * @param      b   the data.
     * @exception IOException if an I/O error occurs.
     * @see        java.io.OutputStream#write(byte[], int, int)
    public void write(byte b[]) throws IOException Extract from OutputStream API

Casting Byte[] to byte[]

This might be a basic java problem but im having problem here.
I have a variable declared as Byte array(Byte[]) and I want to transform it to byte array(byte[]).
How can that be done.
I went through the API, googled but couldnt find a solution.
any help will be appreciated.
Thanx in advance.

You can't transform an array of Byte into an array of byte.
But you can create a new array of byte with the same length as the array of Byte and copy all the values from it.

Displaying the .png image stored in an byte array

Hi,
I have to download an .png image from a server and i have to store it in a byte array and i have to display this byte array in another servlet. I have written the code to get the image from the remote server in a java class. The java class returns the byte array of the image and i have to display that in an servlet.
If anybody has the code or any refrence to refer please help me..
Thanks & Regards
-Sandeep

I have pasted code for servlet's doGet method which writes image data...
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws
ServletException, IOException
HttpSession session = request.getSession(); //taking httpsession
response.setContentType("image/jpeg");
ServletOutputStream out = response.getOutputStream(); //taking outputstream of response
if (rtn.getErrorCode() == 0)
//this will actually write image file data from where it is being called
//byte array will contain image data, please load your image into below byte array variable
byte[] b = new byte[100];
out.write(b);
out = null; //making null
session = null; //making null
In other servlet, write <img> tag and specify its src attribute to the "name of servlet where u have pasted above code" ..
Regards,
Nikhil

Display an object of Image type or Byte Array

Hi, lets say i got an image stored in the Image format or byte[]. How can i make it display the image on the screen by taking the values in byte array or Image field?

Thanks rahul,
The thing is, i am generating a chart in a servlet
and setting the image in the form of a byte [] to the
view bean ( which is binded to the jsp, springs
framework ). The servlet would return the view bean
to the jsp and in the jsp, i am suppose to print this
byte array so as to give me the image..
I hope this makes sense.. pls help me ou!Well letme see if i got tht right or not,
you are trying to call Your MODEL (Business layer / Spring Container) from a servlet and you are expressing that logic in form of chart (Image) and trying to save it as a byte array in a view bean and you want to print /display that as an image in a jsp (After Servlet fwd / redirect action) which includes other data using a ViewBean.
If this is the case...
As the forwaded JSP can include both image and Textual (hypertext too)..we can try a work around hear...Lets dedicate a Servlet which retreives byte [] from a view bean and gives us an image output. hear is an example and this could be a way.
Prior to that i'm trying to make few assumptions here....
1).The chart image which we are trying to express would of format JPEG.
2).we are trying to take help of<img> tag to display the image from the image generating servlet.
here is my approach....
ViewBean.java:
============
public class ViewBean implements serializable{
byte piechart[];
byte barchart[];
byte chart3D[];
public ViewBean(){
public byte[] getPieChart(){
return(this.piechart);
public byte[] getBarChart(){
return(this.barchart);
public byte[] get3DChart(){
return(this.chart3D);
public void setPieChart(byte piechart[]){
this.piechart = piechart;
public void setBarChart(byte barchart[]){
this.barchart = barchart;
public void set3DChart(byte chart3D[]){
this.chart3D = chart3D;
}ControllerServlet.java:
=================
(This could also be an ActionClass(Ref Struts) a Backing Bean(Ref JSF) or anything which stays at the Controller Layer)
public void doGet(HttpServletRequest request,HttpServletResponse response) throws IOException{
/* There are few different implementations of getting   BeanFactory Resource
In,the below example i have used XmlBeanFactory Object to create an instance of (Spring) BeanFactory */
BeanFactory factory =
new XmlBeanFactory(new FileInputStream("SpringResource.xml"));
//write a Util Logic in your Implementation class using JFreeChart (or some open source chart library) and express the images by returning a byte[]
ChartService chartService =
(GreetingService) factory.getBean("chartService");
ViewBean vb = new ViewBean();
vb.setPieChart(chartService.generatePieChart(request.getParameter("<someparam>"));
vb.setBarChart(chartService.generateBarChart(request.getParameter("<someparam1>"));
vb.set3DChart(chartService.generate3DChart(request.getParameter("<someparam2>"));
chartService = null;
HttpSession session = request.getSession(false);
session.setAttribute("ViewBean",vb);
response.sendRedirect("jsp/DisplayReports.jsp");
}DisplayReports.jsp :
================
<%@ page language="java" %>
<html>
<head>
<title>reports</title>
</head>
<body>
<h1 align="center">Pie Chart </h1>
<center><img src="ImageServlet?req=1" /></center>
<h1 align="center">Bar Chart </h1>
<center><img src="ImageServlet?req=2" /></center>
<h1 align="center">3D Chart</h1>
<center><img src="ImageServlet?req=3" /></center>
</body>
</html>ImageServlet.java
==============
public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
       byte buffer[];
        HttpSession session = request.getSession(false);
        ViewBean vb = (ViewBean) session.getAttribute("ViewBean");
        String req = request.getParameter("req");
        if(req.equals("1") == true)
            buffer = vb.getPieChart();
        else if(req.equals("2") == true)
             buffer = vb.getBarChart();
        else if(req.equals("3") == true)
             buffer = vb.get3DChart();
        JPEGImageDecoder decoder = JPEGCodec.createJPEGDecoder(new ByteArrayInputStream(buffer));
        BufferedImage image =decoder.decodeAsBufferedImage() ;
        response.setContentType("image/jpeg");
        // Send back image
        ServletOutputStream sos = response.getOutputStream();
        JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(sos);
        encoder.encode(image);
    }Note: Through ImageServlet is a Servlet i would categorise it under presentation layer rather to be a part of Controller and added to it all this could be easily relaced by a reporting(BI) server like JasperServer,Pentaho,Actuate................
Hope the stated implementation had given some idea to you....
However,If you want to further look into similar implementations take a look at
http://www.swiftchart.com/exampleapp.htm#e5
which i believe to be a wonderful tutor for such implementations...
However, there are many simple (Open) solutions to the stated problem.. if you are Using MyFaces along with spring... i would recommend usage of JSF Chart Tag which is very simple to use all it requires need is to write a chart Object generating methos inside our backing bean.
For further reference have a look at the below links
http://www.jroller.com/page/cagataycivici?entry=acegi_jsf_components_hit_the
http://jsf-comp.sourceforge.net/components/chartcreator/index.html
NOTE:I've tried it personally using MyFaces it was working gr8 but i had a hardtime on deploying my appln on a Portal Server(Liferay).If you find a workaround i'd be glad to know about it.
& there are many BI Open Source Server Appls that can take care of this work too.(Maintainace wud be a tough ask when we go for this)
For, the design perspective had i've been ur PM i wud have choose BI Server if it was corporate web appln on which we work on.
Hope this might be of some help :)
REGARDS,
RaHuL

Displaying Byte Array images in coldfusion

This has been driving me crazy for a couple of days now.I
have a Java class that returns pictures stored in a DB as a Byte
Array.
I am able to display the image but that is all i am able to
do - I want to display the image name, description etc in a HTML
before i display the actual image but i can't seem to find a way to
do that.
I tried using CFcontent as well and that did not help
either.This is what i am currently doing - and all that displays on
the screen is the picture and all content before the picture is
nowhere to be seen.
Picture Name: #variables.picName#
Picture Description:#variables.picDescription#
<cfscript>
context = getPageContext();
response = context.getResponse().getResponse();
out = response.getOutputStream();
response.setContentType("image/jpeg");
response.setContentLength(arrayLen(session.picture));
out.write(session.picture);
out.flush();
out.close();
</cfscript>
Any help will be greatly appreciated.

Mark,
Note that the portal sets the content type (e.g, text/html) and encoding
as the portal page starts rendering. In your case, the
setContentType() would be useless since the servlet container won't let
you change it. You can either use a popup browser window for the pdf as
Kunal suggested, or use an iframe if you want to render the pdf inside
the portlet window.
Subbu
Mark Gilleece wrote:
Hi,
i need to display a PDF file. The PDF is stored in a byte array. This works fine when i run my code (see below) from the .jpf via the debugger/browser, but when i use it as a portlet, in the portal, it does not work ?
Any help is much appreciated.
Thanks
Mark
byte[] pdfDocument = docStore.getPDF();
ServletOutputStream outPdf = response.getOutputStream();
response.setContentType("application/pdf");
outPdf.write(pdfDocument);
outPdf.flush();
outPdf.close();

Byte array exception in web dynpro

Hi all,
I am developing a web dynpro application using a webservice model. The model expects a parameter in the form a byte array.
But unfortunately when I get the following exception when i lauch the web dypro application. Anyone of you, plz help me.
Error stack trace:
com.sap.tc.webdynpro.services.exceptions.WDTypeNotFoundException: type java:byte not found
     at com.sap.tc.webdynpro.services.datatypes.core.DataTypeBroker.getDataType(DataTypeBroker.java:216)
     at com.sap.tc.webdynpro.progmodel.context.AttributeInfo.init(AttributeInfo.java:449)
     at com.sap.tc.webdynpro.progmodel.context.NodeInfo.initAttributes(NodeInfo.java:688)
     at com.sap.tc.webdynpro.progmodel.context.NodeInfo.init(NodeInfo.java:673)
     at com.sap.tc.webdynpro.progmodel.context.NodeInfo.init(NodeInfo.java:678)
     at com.sap.tc.webdynpro.progmodel.context.NodeInfo.init(NodeInfo.java:678)
     at com.sap.tc.webdynpro.progmodel.context.Context.init(Context.java:38)
     at com.sap.tc.webdynpro.progmodel.controller.Controller.init(Controller.java:199)
     at com.sap.tc.webdynpro.clientserver.cal.ClientComponent.init(ClientComponent.java:346)
     at com.sap.tc.webdynpro.clientserver.cal.ClientApplication.init(ClientApplication.java:342)
     at com.sap.tc.webdynpro.clientserver.task.Task.createApplication(Task.java:217)
     at com.sap.tc.webdynpro.clientserver.task.WebDynproMainTask.execute(WebDynproMainTask.java:494)
     at com.sap.tc.webdynpro.clientserver.cal.AbstractClient.executeTasks(AbstractClient.java:54)
     at com.sap.tc.webdynpro.clientserver.cal.ClientManager.doProcessing(ClientManager.java:241)
     at com.sap.tc.webdynpro.serverimpl.defaultimpl.DispatcherServlet.doWebDynproProcessing(DispatcherServlet.java:139)
     at com.sap.tc.webdynpro.serverimpl.defaultimpl.DispatcherServlet.doContent(DispatcherServlet.java:101)
     at com.sap.tc.webdynpro.serverimpl.defaultimpl.DispatcherServlet.doGet(DispatcherServlet.java:38)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:740)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
     at com.sap.engine.services.servlets_jsp.server.HttpHandlerImpl.runServlet(HttpHandlerImpl.java:377)
     at com.sap.engine.services.servlets_jsp.server.HttpHandlerImpl.handleRequest(HttpHandlerImpl.java:257)
     at com.sap.engine.services.httpserver.server.RequestAnalizer.startServlet(RequestAnalizer.java:322)
     at com.sap.engine.services.httpserver.server.RequestAnalizer.startServlet(RequestAnalizer.java:300)
     at com.sap.engine.services.httpserver.server.RequestAnalizer.invokeWebContainer(RequestAnalizer.java:699)
     at com.sap.engine.services.httpserver.server.RequestAnalizer.handle(RequestAnalizer.java:224)
     at com.sap.engine.services.httpserver.server.Client.handle(Client.java:92)
     at com.sap.engine.services.httpserver.server.Processor.request(Processor.java:147)
     at com.sap.engine.core.service630.context.cluster.session.ApplicationSessionMessageListener.process(ApplicationSessionMessageListener.java:37)
     at com.sap.engine.core.cluster.impl6.session.UnorderedChannel$MessageRunner.run(UnorderedChannel.java:71)
     at com.sap.engine.core.thread.impl3.ActionObject.run(ActionObject.java:37)
     at java.security.AccessController.doPrivileged(Native Method)
     at com.sap.engine.core.thread.impl3.SingleThread.execute(SingleThread.java:94)
     at com.sap.engine.core.thread.impl3.SingleThread.run(SingleThread.java:140)
Thanks in Advance
Satish

Hi VS,
I think I haven't explained it clearly.
I have used the file upload component to get the data from a file.. and of course with a context attribute of binary type. I have to assign this byte[] to the web service model method parameter. But to my fascination, the webdynpro application crashes on start throwing the above mentioned exception.
Any Idea??
thanks
satish

InsufficientMemoryException while sending large byte array in WCF Service callback

Hi
I have a datacontract with a large byte array that is passed by the WCF Service back to the client using a callback contract.
Until the byte array size remains below 25-30 MB, it is passed OK, but as soon as it exceeds that, an InsufficientMemoryException is thrown on the service side. I have set the max message sizes at 100 MB and using MTOM Encoder.
I am using WSDualHTTPBinding with sessions and message security - hence streaming is not an option. I know chunking channels are an option, but I want to try to tune the service and client to maximize the byte array size which can be sent over a normal channel.
Kindly advise how to tune settings to get to around 100 MB byte array size.
Binding section of web.config is given below. Same settings for sizes are used on client.
Thanks
Abhishek
<wsDualHttpBinding>
        <binding name="WSHttpBinding_IService" closeTimeout="00:01:00" openTimeout="00:01:00" receiveTimeout="00:10:00" sendTimeout="00:01:00" bypassProxyOnLocal="false"
transactionFlow="false" hostNameComparisonMode="StrongWildcard" maxBufferPoolSize="100000000" maxReceivedMessageSize="100000000" messageEncoding="Mtom" textEncoding="utf-8" useDefaultWebProxy="true">
          <readerQuotas maxArrayLength="100000000" />
          <security mode="Message">
            <message clientCredentialType="Certificate" algorithmSuite="Default" />
          </security>
        </binding>
      </wsDualHttpBinding>

Hi abhisinghal21,
>>InsufficientMemoryException while sending large byte array in WCF Service callback
First please try to increase the timeout value in the both client and service side to see if it works:
closeTimeout="00:10:00" openTimeout="00:10:00"
receiveTimeout="00:10:00" sendTimeout="00:10:00"
Then since you do not want to the use the Chunking option to help you, maybe you try to change the wsDualHttpBinding to use the binding which supports the streaming mode and supports callback.
In streaming transfer mode, the receiver can begin to process the message before it is completely delivered. And the streaming mode is useful when the information that is passed is lengthy and can be processed serially. Streaming mode is also useful when the
message is too large to be entirely buffered. So it will be better for you to use the streamed mode.
For more information, please try to check:
#How to: Enable Streaming:
http://msdn.microsoft.com/en-us/library/ms789010(v=vs.110).aspx .
Best Regards,
Amy Peng
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How Do I Load An Animated GIF Into PictureBox Control From Byte Array?

I'm having a problem with loading an animated GIF int a picturebox control in a C# program after it has been converted to a base64 string, then converted to a byte array, then written to binary, then converted to a base64 string again, then converted to
a byte array, then loaded into a memory stream and finally into a picturebox control.
Here's the step-by-step code I've written:
1. First I open an animated GIF from a file and load it directly into a picturebox control. It animates just fine.
2. Next I convert the image in the picturebox control (pbTitlePageImage) to a base64 string as shown in the code below:
                if (pbTitlePageImage.Image != null)
                    string Image2BConverted;
                    using (Bitmap bm = new Bitmap(pbTitlePageImage.Image))
                        using (MemoryStream ms = new MemoryStream())
                            bm.Save(ms, ImageFormat.Jpeg);
                            Image2BConverted = Convert.ToBase64String(ms.ToArray());
                            GameInfo.TitlePageImage = Image2BConverted;
                            ms.Close();
                            GameInfo.TitlePageImagePresent = true;
                            ProjectNeedsSaving = true;
3. Then I write the base64 string to a binary file using FileStream and BinaryWriter.
4. Next I get the image from the binary file using FileStream and BinaryReader and assign it to a string variable. It is now a base64 string again.
5. Next I load the base64 string into a byte array, then I load it into StreamReader and finally into the picturebox control (pbGameImages) as shown in the code below:
byte[] TitlePageImageBuffer = Convert.FromBase64String(GameInfo.TitlePageImage);
                        MemoryStream memTitlePageImageStream = new MemoryStream(TitlePageImageBuffer, 0, TitlePageImageBuffer.Length);
                        memTitlePageImageStream.Write(TitlePageImageBuffer, 0, TitlePageImageBuffer.Length);
                        memTitlePageImageStream.Position = 0;
                        pbGameImages.Image = Image.FromStream(memTitlePageImageStream, true);
                        memTitlePageImageStream.Close();
                        memTitlePageImageStream = null;
                        TitlePageImageBuffer = null;
This step-by-step will work with all image file types except animated GIFs (standard GIFs work fine). It looks like it's just taking one frame from the animation and loading it into the picturebox. I need to be able to load the entire animation. Does any of
the code above cause the animation to be lost? Any ideas?

There is an ImageAnimator so you may not need to use byte array instead.
ImageAnimator.Animate Method
http://msdn.microsoft.com/en-us/library/system.drawing.imageanimator.animate(v=vs.110).aspx
chanmm
chanmm

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.

Convert XML data to byte array...

Hello All,
In my application, i have an XML file and the corresponding XSD file. This XML file is having some date, which i want to convert into an byte[] and then save it in a file.
How i can convert the XML data in the byte[]? Here as an example of the xml file and the byte[] data which i want to save in a file.
<?xml version="1.0" encoding="utf-8"?>
<HeadersInfo>
<header>
<id>0</id>
<Name>H1</Name>
</header>
<header>
<id>1</id>
<Name>H2</Name>
</header>
</HeasersInfo>
In the above example 'id' field is of type 'uint' and 'name' field is of type 'string' with max length of '5'. So in this case my byte array should be as shown below:
00 00 00 01 48 31 00 00 00
00 00 00 02 48 32 00 00 00
Here underlines values are for the 'id' parameter where as values in bold are for 'Name' parameter for all the header values in sequence. Name parameter is null (0x00) padded.
Thanks in advance,
IamHuM

Hi,
the following example extract the id, name values using LINQ To Xml and writes it to a memory stream using a binary writer and returns the result as a byte array:
internal static byte[] GetXmlAsByteArray()
var document = XDocument.Parse("<HeadersInfo>"
+ " <header><id>1</id><Name>H1</Name></header>"
+ " <header><id>2</id><Name>H2</Name></header>"
// additional testing
+ " <header><id>32767</id><Name>H1234</Name></header>"
+ " <header><id>305419896</id><Name>H56789</Name></header>"
+ "</HeadersInfo>");
const int NameLength = 5; // Max length for a name
byte[] zeroBytes = new byte[NameLength]; // Helper to fill name
using (var ms = new MemoryStream())
using (var writer = new BinaryWriter(ms))
// write each header
foreach (var header in document.Root.Elements("header"))
int id = (int)header.Element("id");
string name = (string)header.Element("Name");
byte[] nameBytes = System.Text.Encoding.UTF8.GetBytes(name);
Console.WriteLine("id: {0}, Name: {1}", id, name);
// Write id
writer.Write(GetUIntBytes((uint)id));
// Write name NameLength (5) max, otherwise padded
if (nameBytes.Length > NameLength)
writer.Write(nameBytes, 0, NameLength);
else
writer.Write(nameBytes, 0, nameBytes.Length);
if (nameBytes.Length < NameLength)
writer.Write(zeroBytes, 0, NameLength - nameBytes.Length);
byte[] result = ms.ToArray();
// dump array
foreach (var value in result)
Console.Write("{0:X2} ", value);
Console.WriteLine();
return result;
public static byte[] GetUIntBytes(uint value)
if (BitConverter.IsLittleEndian)
// swap bytes
value = ((value & 0x00ff) << 24)
| ((value & 0xff00) << 8)
| ((value & 0x00ff0000) >> 8)
| ((value & 0xff000000) >> 24);
return BitConverter.GetBytes(value);
For a general purpose solution you should create a class and split the example into separate methods to extract the data and write the values (integers, strings).
Regards, Elmar

Convert byte array to table of int

[http://www.codeproject.com/KB/database/PassingArraysIntoSPs.aspx?display=Print|http://www.codeproject.com/KB/database/PassingArraysIntoSPs.aspx?display=Print] Hello friends.
I'm pretty new with PL/SQL.
I have code that run well on MSSQL and I want to convert it to PL/SQL with no luck.
The code converts byte array to table of int.
The byte array is actually array of int that was converted to bytes in C# for sending it as parameter.
The TSQL code is:
CREATE FUNCTION dbo.GetTableVarchar(@Data image)
RETURNS @DataTable TABLE (RowID int primary key IDENTITY ,
Value Varchar(8000))
AS
BEGIN
--First Test the data is of type Varchar.
IF(dbo.ValidateExpectedType(103, @Data)<>1) RETURN
--Loop thru the list inserting each
-- item into the variable table.
DECLARE @Ptr int, @Length int,
@VarcharLength smallint, @Value Varchar(8000)
SELECT @Length = DataLength(@Data), @Ptr = 2
WHILE(@Ptr<@Length)
BEGIN
--The first 2 bytes of each item is the length of the
--varchar, a negative number designates a null value.
SET @VarcharLength = SUBSTRING(@Data, @ptr, 2)
SET @Ptr = @Ptr + 2
IF(@VarcharLength<0)
SET @Value = NULL
ELSE
BEGIN
SET @Value = SUBSTRING(@Data, @ptr, @VarcharLength)
SET @Ptr = @Ptr + @VarcharLength
END
INSERT INTO @DataTable (Value) VALUES(@Value)
END
RETURN
END
It's taken from http://www.codeproject.com/KB/database/PassingArraysIntoSPs.aspx?display=Print.
The C# code is:
public byte[] Convert2Bytes(int[] list)
if (list == null || list.Length == 0)
return new byte[0];
byte[] data = new byte[list.Length * 4];
int k = 0;
for (int i = 0; i < list.Length; i++)
byte[] intBytes = BitConverter.GetBytes(list);
for (int j = intBytes.Length - 1; j >= 0; j--)
data[k++] = intBytes[j];
return data;
I tryied to convert the TSQL code to PL/SQL and thats what I've got:
FUNCTION GetTableInt(p_Data blob)
RETURN t_array --t_array is table of int
AS
l_Ptr number;
l_Length number;
l_ID number;
l_data t_array;
BEGIN
     l_Length := dbms_lob.getlength(p_Data);
l_Ptr := 1;
     WHILE(l_Ptr<=l_Length)
     loop
          l_ID := to_number( DBMS_LOB.SUBSTR (p_Data, 4, l_ptr));
          IF(l_ID<-2147483646)THEN
               IF(l_ID=-2147483648)THEN
                    l_ID := NULL;
               ELSE
                    l_Ptr := l_Ptr + 4;
                    l_ID := to_number( DBMS_LOB.SUBSTR(p_Data, 4,l_ptr));
               END IF;
               END IF;
l_data(l_data.count) := l_ID;
          l_Ptr := l_Ptr + 4;
     END loop;
     RETURN l_data;
END GetTableInt;
This isn't work.
This is the error:
Error report:
ORA-06502: PL/SQL: numeric or value error: character to number conversion error
06502. 00000 - "PL/SQL: numeric or value error%s"
I think the problem is in this line:
l_ID := to_number( DBMS_LOB.SUBSTR (p_Data, 4, l_ptr));
but I don't know how to fix that.
Thanks,
MTs.

I'd found the solution.
I need to write:
l_ID := utl_raw.cast_to_binary_integer( DBMS_LOB.SUBSTR(p_Data, 4,l_ptr));
instead of:
l_ID := to_number( DBMS_LOB.SUBSTR (p_Data, 4, l_ptr));
The performance isn't good, it's take 2.8 sec to convert 5000 int, but it's works.

Converting ASCII text (byte array ending in null) to a String

Hi all,
I am trying to convert a null terminated ascii string stored in a byte array to a java String. When I pass the byte array to the String constructor it
does not detect/interpret the null as a terminator for the ascii string. Is this something I have to manually program in? ie Check for where the null is and then
pass that subarray of everything before the null to the String constructor?
example of problem
// A B C D null F (note F is junk in the array, and should be ignored since it is after null)
byte[] asciiArray = { 65, 66, 67, 68, 0, 70 };
System.out.println(new String(asciiArray, "UTF-8"));
//this prints ABCD"sqare icon"F

Why do you expect the null character to terminate the string? If you come from a C or C++ background, you need to understand that java.lang.String is not just a mere character array. It's a full-fledged Java object that knows its length without having any need for null terminator. So Ascii 0 is just another character for String object. To achieve what you want to do, you have to manually loop through the byte array and stop when you encounter a null character.

How do I read directly from file into byte array

I am reading an image from a file into a BuffertedImage then writing it out again into an array of bytes which I store and use later on in the program. Currently Im doing this in two stages is there a way to do it it one go to speed things up.
try
            //Read File Contents into a Buffered Image
            /** BUG 4705399: There was a problem with some jpegs taking ages to load turns out to be
             * (at least partially) a problem with non-standard colour models, which is why we set the
             * destination colour model. The side effect should be standard colour model in subsequent reading.
            BufferedImage bi = null;
            ImageReader ir = null;
            ImageInputStream stream = ImageIO.createImageInputStream(new File(path));
            final Iterator i = ImageIO.getImageReaders(stream);
            if (i.hasNext())
                ir = (ImageReader) i.next();
                ir.setInput(stream);
                ImageReadParam param = ir.getDefaultReadParam();
                ImageTypeSpecifier typeToUse = null;
                for (Iterator i2 = ir.getImageTypes(0); i2.hasNext();)
                    ImageTypeSpecifier type = (ImageTypeSpecifier) i2.next();
                    if (type.getColorModel().getColorSpace().isCS_sRGB())
                        typeToUse = type;
                if (typeToUse != null)
                    param.setDestinationType(typeToUse);
                bi = ir.read(0, param);
                //ir.dispose(); seem to reference this in write
                //stream.close();
            //Write Buffered Image to Byte ArrayOutput Stream
            if (bi != null)
                //Convert to byte array
                final ByteArrayOutputStream output = new ByteArrayOutputStream();
                //Try and find corresponding writer for reader but if not possible
                //we use JPG (which is always installed) instead.
                final ImageWriter iw = ImageIO.getImageWriter(ir);
                if (iw != null)
                    if (ImageIO.write(bi, ir.getFormatName(), new DataOutputStream(output)) == false)
                        MainWindow.logger.warning("Unable to Write Image");
                else
                    if (ImageIO.write(bi, "JPG", new DataOutputStream(output)) == false)
                        MainWindow.logger.warning("Warning Unable to Write Image as JPEG");
                //Add to image list
                final byte[] imageData = output.toByteArray();
                Images.addImage(imageData);


If you don't need to manipulate the image in any way I would suggest you just read the image file directly into a byte array (without ImageReader) and then create the BufferedImage from that byte array.

Byte array (byte[]) in session

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