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  • jQuery AJAX (google PageRank)

    - by RobertPitt
    Hey guys, I need a little help.. iv'e been developing a Jqery plug-in to get the page ranks of urls on a website using XHR, The problem is when requesting the rank from google servers the page is returned no content, but if i use an inspector and get the url that was requests and go to it via my browser the pageranks are shown. so it must be something with headers but its just got me puzzled. Heres some source code but i have removed several aspects that are not needed to review. pagerank.plugin.js ( $.fn.PageRank = function(callback) { var _library = new Object(); //Creat the system library _library.parseUrl = function(a) { var b = {}; var a = a || ''; /* * parse the url to extract its parts */ if (a = a.match(/((s?ftp|https?):\/\/){1}([^\/:]+)?(:([0-9]+))?([^\?#]+)?(\?([^#]+))?(#(.+))?/)) { b.scheme = a[2] ? a[2] : "http"; b.host = a[3] ? a[3] : null; b.port = a[5] ? a[5] : null; b.path = a[6] ? a[6] : null; b.args = a[8] ? a[8] : null; b.anchor = a[10] ? a[10] : null } return b } _library.ValidUrl = function(url) { var b = true; return b = url.host === undefined ? false : url.scheme != "http" && url.scheme != "https" ? false : url.host == "localhost" ? false : true } _library.toHex = function(a){ return (a < 16 ? "0" : "") + a.toString(16) } _library.hexEncodeU32 = function(a) { } _library.generateHash = function(a) { for (var b = 16909125, c = 0; c < a.length; c++) { } return _library.hexEncodeU32(b) } var CheckPageRank = function(domain,_call) { var hash = _library.generateHash(domain); $.ajax( { url: 'http://www.google.com/search?client=navclient-auto&ch=8'+hash+'&features=Rank&q=info:' + escape(domain), async: true, dataType: 'html', ifModified:true, contentType:'', type:'GET', beforeSend:function(xhr) { xhr.setRequestHeader('Referer','http://google.com/'); //Set Referer }, success: function(content,textS,xhr){ var d = xhr.responseText.substr(9, 2).replace(/\s$/, ""); if (d == "" || isNaN(d * 1)) d = "0"; _call(d); } }); } //Return the callback $(this).each(function(){ urlsegments = _library.parseUrl($(this).attr('href')) if(_library.ValidUrl(urlsegments)) { CheckPageRank(urlsegments.host,function(rank){ alert(rank) callback(rank); }); } }); return this; //Dont break any chain. } )(jQuery); Index.html (example) <html> <head> <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.1/jquery.min.js"></script> <script type="text/javascript" src="pagerank.plugin.js"></script> <script type="text/javascript"> $(document).ready(function() { $('a').PageRank(function(pr){ alert(pr); }) }); </script> </head> <body> <a href="http://facebook.com">a</a> <a href="http://twitter.com">a</a> <div></div> </body> </html> i just cant understand why its doing this.

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  • Python - help on custom wx.Python (pyDev) class

    - by Wallter
    I have been hitting a dead end with this program. I am trying to build a class that will let me control the BIP's of a button when it is in use. so far this is what i have (see following.) It keeps running this weird error TypeError: 'module' object is not callable - I, coming from C++ and C# (for some reason the #include... is so much easier) , have no idea what that means, Google is of no help so... I know I need some real help with sintax and such - anything woudl be helpful. Note: The base code found here was used to create a skeleton for this 'custom button class' Custom Button import wx from wxPython.wx import * class Custom_Button(wx.PyControl): # The BMP's # AM I DOING THIS RIGHT? - I am trying to get empty 'global' # variables within the class Mouse_over_bmp = None #wxEmptyBitmap(1,1,1) # When the mouse is over Norm_bmp = None #wxEmptyBitmap(1,1,1) # The normal BMP Push_bmp = None #wxEmptyBitmap(1,1,1) # The down BMP Pos_bmp = wx.Point(0,0) # The posisition of the button def __init__(self, parent, NORM_BMP, PUSH_BMP, MOUSE_OVER_BMP, pos, size, text="", id=-1, **kwargs): wx.PyControl.__init__(self,parent, id, **kwargs) # The conversions, hereafter, were to solve another but. I don't know if it is # necessary to do this since the source being given to the class (in this case) # is a BMP - is there a better way to prevent an error that i have not # stumbled accost? # Set the BMP's to the ones given in the constructor self.Mouse_over_bmp = wx.Bitmap(wx.Image(MOUSE_OVER_BMP, wx.BITMAP_TYPE_ANY).ConvertToBitmap()) self.Norm_bmp = wx.Bitmap(wx.Image(NORM_BMP, wx.BITMAP_TYPE_ANY).ConvertToBitmap()) self.Push_bmp = wx.Bitmap(wx.Image(PUSH_BMP, wx.BITMAP_TYPE_ANY).ConvertToBitmap()) self.Pos_bmp = self.pos self.Bind(wx.EVT_LEFT_DOWN, self._onMouseDown) self.Bind(wx.EVT_LEFT_UP, self._onMouseUp) self.Bind(wx.EVT_LEAVE_WINDOW, self._onMouseLeave) self.Bind(wx.EVT_ENTER_WINDOW, self._onMouseEnter) self.Bind(wx.EVT_ERASE_BACKGROUND,self._onEraseBackground) self.Bind(wx.EVT_PAINT,self._onPaint) self._mouseIn = self._mouseDown = False def _onMouseEnter(self, event): self._mouseIn = True def _onMouseLeave(self, event): self._mouseIn = False def _onMouseDown(self, event): self._mouseDown = True def _onMouseUp(self, event): self._mouseDown = False self.sendButtonEvent() def sendButtonEvent(self): event = wx.CommandEvent(wx.wxEVT_COMMAND_BUTTON_CLICKED, self.GetId()) event.SetInt(0) event.SetEventObject(self) self.GetEventHandler().ProcessEvent(event) def _onEraseBackground(self,event): # reduce flicker pass def _onPaint(self, event): dc = wx.BufferedPaintDC(self) dc.SetFont(self.GetFont()) dc.SetBackground(wx.Brush(self.GetBackgroundColour())) dc.Clear() dc.DrawBitmap(self.Norm_bmp) # draw whatever you want to draw # draw glossy bitmaps e.g. dc.DrawBitmap if self._mouseIn: # If the Mouse is over the button dc.DrawBitmap(self, self.Mouse_over_bmp, self.Pos_bmp, useMask=False) if self._mouseDown: # If the Mouse clicks the button dc.DrawBitmap(self, self.Push_bmp, self.Pos_bmp, useMask=False) Main.py import wx import Custom_Button from wxPython.wx import * ID_ABOUT = 101 ID_EXIT = 102 class MyFrame(wx.Frame): def __init__(self, parent, ID, title): wxFrame.__init__(self, parent, ID, title, wxDefaultPosition, wxSize(400, 400)) self.CreateStatusBar() self.SetStatusText("Program testing custom button overlays") menu = wxMenu() menu.Append(ID_ABOUT, "&About", "More information about this program") menu.AppendSeparator() menu.Append(ID_EXIT, "E&xit", "Terminate the program") menuBar = wxMenuBar() menuBar.Append(menu, "&File"); self.SetMenuBar(menuBar) self.Button1 = Custom_Button(self, parent, -1, "D:/Documents/Python/Normal.bmp", "D:/Documents/Python/Clicked.bmp", "D:/Documents/Python/Over.bmp", wx.Point(200,200), wx.Size(300,100)) EVT_MENU(self, ID_ABOUT, self.OnAbout) EVT_MENU(self, ID_EXIT, self.TimeToQuit) def OnAbout(self, event): dlg = wxMessageDialog(self, "Testing the functions of custom " "buttons using pyDev and wxPython", "About", wxOK | wxICON_INFORMATION) dlg.ShowModal() dlg.Destroy() def TimeToQuit(self, event): self.Close(true) class MyApp(wx.App): def OnInit(self): frame = MyFrame(NULL, -1, "wxPython | Buttons") frame.Show(true) self.SetTopWindow(frame) return true app = MyApp(0) app.MainLoop() Errors (and traceback) /home/wallter/python/Custom Button overlay/src/Custom_Button.py:8: DeprecationWarning: The wxPython compatibility package is no longer automatically generated or actively maintained. Please switch to the wx package as soon as possible. I have never been able to get this to go away whenever using wxPython any help? from wxPython.wx import * Traceback (most recent call last): File "/home/wallter/python/Custom Button overlay/src/Main.py", line 57, in <module> app = MyApp(0) File "/usr/lib/python2.6/dist-packages/wx-2.8-gtk2-unicode/wx/_core.py", line 7978, in __init__ self._BootstrapApp() File "/usr/lib/python2.6/dist-packages/wx-2.8-gtk2-unicode/wx/_core.py", line 7552, in _BootstrapApp return _core_.PyApp__BootstrapApp(*args, **kwargs) File "/home/wallter/python/Custom Button overlay/src/Main.py", line 52, in OnInit frame = MyFrame(NULL, -1, "wxPython | Buttons") File "/home/wallter/python/Custom Button overlay/src/Main.py", line 32, in __init__ wx.Point(200,200), wx.Size(300,100)) TypeError: 'module' object is not callable I have tried removing the "wx.Point(200,200), wx.Size(300,100))" just to have the error move up to the line above. Have I declared it right? help?

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  • How can I properly implement inetcpl.cpl as an external dll?

    - by Kyt
    I have the following 2 sets of code, both of which produce the same results: using System.Linq; using System.Runtime.InteropServices; using System.Text; using System.Threading.Tasks; using System.Windows.Forms; namespace ResetIE { class Program { [DllImport("InetCpl.cpl", SetLastError=true, CharSet=CharSet.Unicode, EntryPoint="ClearMyTracksByProcessW")] public static extern long ClearMyTracksByProcess(IntPtr hwnd, IntPtr hinst, ref TargetHistory lpszCmdLine, FormWindowState nCmdShow); static void Main(string[] args) { TargetHistory th = TargetHistory.CLEAR_TEMPORARY_INTERNET_FILES; ClearMyTracksByProcessW(Process.GetCurrentProcess().Handle, Marshal.GetHINSTANCE(typeof(Program).Module), ref th, FormWindowState.Maximized); Console.WriteLine("Done."); } } and ... static class NativeMethods { [DllImport("kernel32.dll")] public static extern IntPtr LoadLibrary(string dllToLoad); [DllImport("kernel32.dll")] public static extern IntPtr GetProcAddress(IntPtr hModule, string procedureName); [DllImport("kernel32.dll")] public static extern bool FreeLibrary(IntPtr hModule); } public class CallExternalDLL { [UnmanagedFunctionPointer(CallingConvention.Cdecl)] public delegate long ClearMyTracksByProcessW(IntPtr hwnd, IntPtr hinst, ref TargetHistory lpszCmdLine, FormWindowState nCmdShow); public static void Clear_IE_Cache() { IntPtr pDll = NativeMethods.LoadLibrary(@"C:\Windows\System32\inetcpl.cpl"); if (pDll == IntPtr.Zero) { Console.WriteLine("An Error has Occurred."); } IntPtr pAddressOfFunctionToCall = NativeMethods.GetProcAddress(pDll, "ClearMyTracksByProcessW"); if (pAddressOfFunctionToCall == IntPtr.Zero) { Console.WriteLine("Function Not Found."); } ClearMyTracksByProcessW cmtbp = (ClearMyTracksByProcessW)Marshal.GetDelegateForFunctionPointer(pAddressOfFunctionToCall, typeof(ClearMyTracksByProcessW)); TargetHistory q = TargetHistory.CLEAR_TEMPORARY_INTERNET_FILES; long result = cmtbp(Process.GetCurrentProcess().Handle, Marshal.GetHINSTANCE(typeof(ClearMyTracksByProcessW).Module), ref q, FormWindowState.Normal); } } both use the following Enum: public enum TargetHistory { CLEAR_ALL = 0xFF, CLEAR_ALL_WITH_ADDONS = 0x10FF, CLEAR_HISTORY = 0x1, CLEAR_COOKIES = 0x2, CLEAR_TEMPORARY_INTERNET_FILES = 0x8, CLEAR_FORM_DATA = 0x10, CLEAR_PASSWORDS = 0x20 } Both methods of doing this compile and run just fine, offering no errors, but both churn endlessly never returning from their work. The PInvoke code was ported from the following VB, which was fairly difficult to track down: Option Explicit Private Enum TargetHistory CLEAR_ALL = &HFF& CLEAR_ALL_WITH_ADDONS = &H10FF& CLEAR_HISTORY = &H1& CLEAR_COOKIES = &H2& CLEAR_TEMPORARY_INTERNET_FILES = &H8& CLEAR_FORM_DATA = &H10& CLEAR_PASSWORDS = &H20& End Enum Private Declare Function ClearMyTracksByProcessW Lib "InetCpl.cpl" _ (ByVal hwnd As OLE_HANDLE, _ ByVal hinst As OLE_HANDLE, _ ByRef lpszCmdLine As Byte, _ ByVal nCmdShow As VbAppWinStyle) As Long Private Sub Command1_Click() Dim b() As Byte Dim o As OptionButton For Each o In Option1 If o.Value Then b = o.Tag ClearMyTracksByProcessW Me.hwnd, App.hInstance, b(0), vbNormalFocus Exit For End If Next End Sub Private Sub Form_Load() Command1.Caption = "??" Option1(0).Caption = "?????????????" Option1(0).Tag = CStr(CLEAR_TEMPORARY_INTERNET_FILES) Option1(1).Caption = "Cookie" Option1(1).Tag = CStr(CLEAR_COOKIES) Option1(2).Caption = "??" Option1(2).Tag = CStr(CLEAR_HISTORY) Option1(3).Caption = "???? ???" Option1(3).Tag = CStr(CLEAR_HISTORY) Option1(4).Caption = "?????" Option1(4).Tag = CStr(CLEAR_PASSWORDS) Option1(5).Caption = "?????" Option1(5).Tag = CStr(CLEAR_ALL) Option1(2).Value = True End Sub The question is simply what am I doing wrong? I need to clear the internet cache, and would prefer to use this method as I know it does what I want it to when it works (rundll32 inetcpl.cpl,ClearMyTracksByProcess 8 works fine). I've tried running both as normal user and admin to no avail. This project is written using C# in VS2012 and compiled against .NET3.5 (must remain at 3.5 due to client restrictions)

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  • Radix sort in java help

    - by endif
    Hi i need some help to improve my code. I am trying to use Radixsort to sort array of 10 numbers (for example) in increasing order. When i run the program with array of size 10 and put 10 random int numbers in like 70 309 450 279 799 192 586 609 54 657 i get this out: 450 309 192 279 54 192 586 657 54 609 Don´t see where my error is in the code. class IntQueue { static class Hlekkur { int tala; Hlekkur naest; } Hlekkur fyrsti; Hlekkur sidasti; int n; public IntQueue() { fyrsti = sidasti = null; } // First number in queue. public int first() { return fyrsti.tala; } public int get() { int res = fyrsti.tala; n--; if( fyrsti == sidasti ) fyrsti = sidasti = null; else fyrsti = fyrsti.naest; return res; } public void put( int i ) { Hlekkur nyr = new Hlekkur(); n++; nyr.tala = i; if( sidasti==null ) f yrsti = sidasti = nyr; else { sidasti.naest = nyr; sidasti = nyr; } } public int count() { return n; } public static void radixSort(int [] q, int n, int d){ IntQueue [] queue = new IntQueue[n]; for (int k = 0; k < n; k++){ queue[k] = new IntQueue(); } for (int i = d-1; i >=0; i--){ for (int j = 0; j < n; j++){ while(queue[j].count() != 0) { queue[j].get(); } } for (int index = 0; index < n; index++){ // trying to look at one of three digit to sort after. int v=1; int digit = (q[index]/v)%10; v*=10; queue[digit].put(q[index]); } for (int p = 0; p < n; p++){ while(queue[p].count() != 0) { q[p] = (queue[p].get()); } } } } } I am also thinking can I let the function take one queue as an argument and on return that queue is in increasing order? If so how? Please help. Sorry if my english is bad not so good in it. Please let know if you need more details. import java.util.Random; public class RadTest extends IntQueue { public static void main(String[] args) { int [] q = new int[10]; Random r = new Random(); int t = 0; int size = 10; while(t != size) { q[t] = (r.nextInt(1000)); t++; } for(int i = 0; i!= size; i++) { System.out.println(q[i]); } System.out.println("Radad: \n"); radixSort(q,size,3); for(int i = 0; i!= size; i++) { System.out.println(q[i]); } } } Hope this is what you were talking about...

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  • Outer class jframe is not hiding when calling the inner class jframe

    - by user2909960
    When i am calling the inner jframe, it is called, but outer jframe is not hiding. instead it gets overlapped. so what will be the solution for this. Is there any way to get out of this. As i tried when i am calling the inner class frame, the outer class frame is also called, and it is not hidden. package com.exp.example; import java.awt.Color; import java.awt.Container; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JTextField; @SuppressWarnings("serial") public class A extends JFrame implements ActionListener { JFrame rframe = new JFrame(); JLabel CFirstName; JTextField Cfname; JButton jbsubmit; Container cp; public A() { rframe.setSize(500, 200); rframe.setLocationRelativeTo(null); cp = getContentPane(); cp.setLayout(null); setSize(550, 300); rframe.setTitle("Outer Frame"); cp.setBackground(new Color(140, 180, 180)); CFirstName = new JLabel("First Name"); Cfname = new JTextField(10); jbsubmit = new JButton("PREVIEW"); CFirstName.setBounds(10, 20, 100, 35); Cfname.setBounds(150, 20, 150, 25); jbsubmit.setBounds(190, 110, 92, 25); cp.add(CFirstName); cp.add(Cfname); cp.add(jbsubmit); jbsubmit.addActionListener(this); rframe.add(cp); rframe.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); rframe.setVisible(true); } public void actionPerformed(ActionEvent ae) { String action = ae.getActionCommand(); if (action == "PREVIEW") { /* Write the code here * When we click on preview button the frame of outer class(class A) gets * deactivated(closed) and inner frame, frame of inner class(class B) gets visible. * it should not be overlapped. */ /* My Code */ new B(); rframe.setVisible(false); } } public class B { JFrame frm = new JFrame(); Container cp; public B() { frm.setSize(500, 200); frm.setLocationRelativeTo(null); cp = getContentPane(); cp.setLayout(null); setSize(550, 300); frm.setTitle("Inner Frame"); cp.setBackground(new Color(140, 180, 180)); JLabel cpn = new JLabel("hello"); cpn.setBounds(10, 20, 100, 35); cp.add(cpn); frm.add(cp); frm.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frm.setVisible(true); } } public static void main(String[] args) { new A(); } }

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  • JAVA BubbleSort Output Plotting

    - by John Smith
    I'm not sure how to plot the output I get with my run time results for BubbleSort. Here's the thing: I've written a working BubbleSort algorithm that does exactly as it should. But I wish to plot the output, to show the following: Best Case, Worst Case, Average Case ... How would I go about plotting it on a graph? Here is the code: public class BubbleSort { static double bestTime = 10000000, worstTime = 0; public static void main(String[] args) { int BubArray[] = new int[]{13981, 6793, 2662, 10986, 733, ... #1000 integers}; System.out.println("Unsorted List Before Bubble Sort"); for(int a = 0; a < BubArray.length; a++){ System.out.print(BubArray[a] + " "); } System.out.println("\n Bubble Sort Execution ..."); for(int i=0; i<10000;i++) { bubbleSortTimeTaken(BubArray, i); } int itrs = bubbleSort(BubArray); System.out.println(""); System.out.println("Array After Bubble Sort"); System.out.println("Moves Taken for Sort : " + itrs + " Moves."); System.out.println("BestTime: " + bestTime + " WorstTime: " + worstTime); System.out.print("Sorted Array: \n"); for(int a = 0; a < BubArray.length; a++){ System.out.print(BubArray[a] + " "); } } private static int bubbleSort(int[] BubArray) { int z = BubArray.length; int temp = 0; int itrs = 0; for(int a = 0; a < z; a++){ for(int x=1; x < (z-a); x++){ if(BubArray[x-1] > BubArray[x]){ temp = BubArray[x-1]; BubArray[x-1] = BubArray[x]; BubArray[x] = temp; } itrs++; } } return itrs; } public static void bubbleSortTimeTaken(int[] BubArray, int n) { long startTime = System.nanoTime(); bubbleSort(BubArray); double timeTaken = (System.nanoTime() - startTime)/1000000d; if (timeTaken > 0) { worstTime = timeTaken; } else if (timeTaken < bestTime) { bestTime = timeTaken; } System.out.println(n + "," + timeTaken); } } The output are as the following ( execution number, time (nano/10^6): Unsorted List Before Bubble Sort 13981 6793 2662 .... #1000 integers Bubble Sort Execution ... 0, 18.319891 1, 4.728978 2, 3.670697 3, 3.648922 4, 4.161576 5, 3.824369 .... 9995, 4.331423 9996, 3.692473 9997, 3.709893 9998, 6.16055 9999, 4.32209 Array After Bubble Sort Moves Taken for Sort : 541320 Moves. BestTime: 1.0E7 WorstTime: 4.32209 Sorted Array: 10 11 17 24 57 60 83 128 141 145 ... #1000 integers I am looking for graphs to represent Average, Best and Worst case based on the output but my current graphs don't look correct. Any help would be appreciated, thanks.

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  • Java Synchronized List Deadlock

    - by portoalet
    From Effective Java 2nd edition item 67 page 266-268: The background thread calls s.removeObserver, which attempts to lock observers, but it can’t acquire the lock, because the main thread already has the lock. All the while, the main thread is waiting for the background thread to finish removing the observer, which explains the deadlock. I am trying to find out which threads deadlock in the main method by using ThreadMXBean (http://stackoverflow.com/questions/1102359/programmatic-deadlock-detection-in-java) , but why does it not return the deadlocked threads? I used a new Thread to run the ThreadMXBean detection. public class ObservableSet<E> extends ForwardingSet<E> { public ObservableSet(Set<E> set) { super(set); } private final List<SetObserver<E>> observers = new ArrayList<SetObserver<E>>(); public void addObserver(SetObserver<E> observer) { synchronized(observers) { observers.add(observer); } } public boolean removeObserver(SetObserver<E> observer) { synchronized(observers) { return observers.remove(observer); } } private void notifyElementAdded(E element) { synchronized(observers) { for (SetObserver<E> observer : observers) observer.added(this, element); } } @Override public boolean add(E element) { boolean added = super.add(element); if (added) notifyElementAdded(element); return added; } @Override public boolean addAll(Collection<? extends E> c) { boolean result = false; for (E element : c) result|=add(element); //callsnotifyElementAdded return result; } public static void main(String[] args) { ObservableSet<Integer> set = new ObservableSet<Integer>(new HashSet<Integer>()); final ThreadMXBean threadMxBean = ManagementFactory.getThreadMXBean(); Thread t = new Thread(new Runnable() { @Override public void run() { while( true ) { long [] threadIds = threadMxBean.findDeadlockedThreads(); if( threadIds != null) { ThreadInfo[] infos = threadMxBean.getThreadInfo(threadIds); for( ThreadInfo threadInfo : infos) { StackTraceElement[] stacks = threadInfo.getStackTrace(); for( StackTraceElement stack : stacks ) { System.out.println(stack.toString()); } } } try { System.out.println("Sleeping.."); TimeUnit.MILLISECONDS.sleep(1000); } catch (InterruptedException e) { // TODO Auto-generated catch block e.printStackTrace(); } } } }); t.start(); set.addObserver(new SetObserver<Integer>() { public void added(ObservableSet<Integer> s, Integer e) { ExecutorService executor = Executors.newSingleThreadExecutor(); final SetObserver<Integer> observer = this; try { executor.submit(new Runnable() { public void run() { s.removeObserver(observer); } }).get(); } catch (ExecutionException ex) { throw new AssertionError(ex.getCause()); } catch (InterruptedException ex) { throw new AssertionError(ex.getCause()); } finally { executor.shutdown(); } } }); for (int i = 0; i < 100; i++) set.add(i); } } public interface SetObserver<E> { // Invoked when an element is added to the observable set void added(ObservableSet<E> set, E element); } // ForwardingSet<E> simply wraps another Set and forwards all operations to it.

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  • Error Handling without Exceptions

    - by James
    While searching SO for approaches to error handling related to business rule validation , all I encounter are examples of structured exception handling. MSDN and many other reputable development resources are very clear that exceptions are not to be used to handle routine error cases. They are only to be used for exceptional circumstances and unexpected errors that may occur from improper use by the programmer (but not the user.) In many cases, user errors such as fields that are left blank are common, and things which our program should expect, and therefore are not exceptional and not candidates for use of exceptions. QUOTE: Remember that the use of the term exception in programming has to do with the thinking that an exception should represent an exceptional condition. Exceptional conditions, by their very nature, do not normally occur; so your code should not throw exceptions as part of its everyday operations. Do not throw exceptions to signal commonly occurring events. Consider using alternate methods to communicate to a caller the occurrence of those events and leave the exception throwing for when something truly out of the ordinary happens. For example, proper use: private void DoSomething(string requiredParameter) { if (requiredParameter == null) throw new ArgumentExpcetion("requiredParameter cannot be null"); // Remainder of method body... } Improper use: // Renames item to a name supplied by the user. Name must begin with an "F". public void RenameItem(string newName) { // Items must have names that begin with "F" if (!newName.StartsWith("F")) throw new RenameException("New name must begin with /"F/""); // Remainder of method body... } In the above case, according to best practices, it would have been better to pass the error up to the UI without involving/requiring .NET's exception handling mechanisms. Using the same example above, suppose one were to need to enforce a set of naming rules against items. What approach would be best? Having the method return a enumerated result? RenameResult.Success, RenameResult.TooShort, RenameResult.TooLong, RenameResult.InvalidCharacters, etc. Using an event in a controller class to report to the UI class? The UI calls the controller's RenameItem method, and then handles an AfterRename event that the controller raises and that has rename status as part of the event args? The controlling class directly references and calls a method from the UI class that handles the error, e.g. ReportError(string text). Something else... ? Essentially, I want to know how to perform complex validation in classes that may not be the Form class itself, and pass the errors back to the Form class for display -- but I do not want to involve exception handling where it should not be used (even though it seems much easier!) Based on responses to the question, I feel that I'll have to state the problem in terms that are more concrete: UI = User Interface, BLL = Business Logic Layer (in this case, just a different class) User enters value within UI. UI reports value to BLL. BLL performs routine validation of the value. BLL discovers rule violation. BLL returns rule violation to UI. UI recieves return from BLL and reports error to user. Since it is routine for a user to enter invalid values, exceptions should not be used. What is the right way to do this without exceptions?

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  • Padding error - when using AES Encryption in Java and Decryption in C

    - by user234445
    Hi All, I have a problem while decrypting the xl file in rijndael 'c' code (The file got encrypted in Java through JCE) and this problem is happening only for the excel files types which having formula's. Remaining all file type encryption/decryption is happening properly. (If i decrypt the same file in java the output is coming fine.) While i am dumped a file i can see the difference between java decryption and 'C' file decryption. od -c -b filename(file decrypted in C) 0034620 005 006 \0 \0 \0 \0 022 \0 022 \0 320 004 \0 \0 276 4 005 006 000 000 000 000 022 000 022 000 320 004 000 000 276 064 0034640 \0 \0 \0 \0 \f \f \f \f \f \f \f \f \f \f \f \f 000 000 000 000 014 014 014 014 014 014 014 014 014 014 014 014 0034660 od -c -b filename(file decrypted in Java) 0034620 005 006 \0 \0 \0 \0 022 \0 022 \0 320 004 \0 \0 276 4 005 006 000 000 000 000 022 000 022 000 320 004 000 000 276 064 0034640 \0 \0 \0 \0 000 000 000 000 0034644 (the above is the difference between the dumped files) The following java code i used to encrypt the file. public class AES { /** * Turns array of bytes into string * * @param buf Array of bytes to convert to hex string * @return Generated hex string */ public static void main(String[] args) throws Exception { File file = new File("testxls.xls"); byte[] lContents = new byte[(int) file.length()]; try { FileInputStream fileInputStream = new FileInputStream(file); fileInputStream.read(lContents); } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e1) { e1.printStackTrace(); } try { KeyGenerator kgen = KeyGenerator.getInstance("AES"); kgen.init(256); // 192 and 256 bits may not be available // Generate the secret key specs. SecretKey skey = kgen.generateKey(); //byte[] raw = skey.getEncoded(); byte[] raw = "aabbccddeeffgghhaabbccddeeffgghh".getBytes(); SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES"); Cipher cipher = Cipher.getInstance("AES"); cipher.init(Cipher.ENCRYPT_MODE, skeySpec); byte[] encrypted = cipher.doFinal(lContents); cipher.init(Cipher.DECRYPT_MODE, skeySpec); byte[] original = cipher.doFinal(lContents); FileOutputStream f1 = new FileOutputStream("testxls_java.xls"); f1.write(original); } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } } } I used the following file for decryption in 'C'. #include <stdio.h> #include "rijndael.h" #define KEYBITS 256 #include <stdio.h> #include "rijndael.h" #define KEYBITS 256 int main(int argc, char **argv) { unsigned long rk[RKLENGTH(KEYBITS)]; unsigned char key[KEYLENGTH(KEYBITS)]; int i; int nrounds; char dummy[100] = "aabbccddeeffgghhaabbccddeeffgghh"; char *password; FILE *input,*output; password = dummy; for (i = 0; i < sizeof(key); i++) key[i] = *password != 0 ? *password++ : 0; input = fopen("doc_for_logu.xlsb", "rb"); if (input == NULL) { fputs("File read error", stderr); return 1; } output = fopen("ori_c_res.xlsb","w"); nrounds = rijndaelSetupDecrypt(rk, key, 256); while (1) { unsigned char plaintext[16]; unsigned char ciphertext[16]; int j; if (fread(ciphertext, sizeof(ciphertext), 1, input) != 1) break; rijndaelDecrypt(rk, nrounds, ciphertext, plaintext); fwrite(plaintext, sizeof(plaintext), 1, output); } fclose(input); fclose(output); }

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  • How to set BackGround color to a divider in JSplitPane

    - by Sunil Kumar Sahoo
    I have created a divider in JSplitPane. I am unable to set the color of divider. I want to set the color of divider. please help me how to set color of that divider import javax.swing.; import java.awt.; import java.awt.event.*; public class SplitPaneDemo { JFrame frame; JPanel left, right; JSplitPane pane; int lastDividerLocation = -1; public static void main(String[] args) { SplitPaneDemo demo = new SplitPaneDemo(); demo.makeFrame(); demo.frame.addWindowListener(new WindowAdapter() { public void windowClosing(WindowEvent e) { System.exit(0); } }); demo.frame.show(); } public JFrame makeFrame() { frame = new JFrame(); // Create a horizontal split pane. pane = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT); left = new JPanel(); left.setBackground(Color.red); pane.setLeftComponent(left); right = new JPanel(); right.setBackground(Color.green); pane.setRightComponent(right); JButton showleft = new JButton("Left"); showleft.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { Container c = frame.getContentPane(); if (pane.isShowing()) { lastDividerLocation = pane.getDividerLocation(); } c.remove(pane); c.remove(left); c.remove(right); c.add(left, BorderLayout.CENTER); c.validate(); c.repaint(); } }); JButton showright = new JButton("Right"); showright.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { Container c = frame.getContentPane(); if (pane.isShowing()) { lastDividerLocation = pane.getDividerLocation(); } c.remove(pane); c.remove(left); c.remove(right); c.add(right, BorderLayout.CENTER); c.validate(); c.repaint(); } }); JButton showboth = new JButton("Both"); showboth.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { Container c = frame.getContentPane(); c.remove(pane); c.remove(left); c.remove(right); pane.setLeftComponent(left); pane.setRightComponent(right); c.add(pane, BorderLayout.CENTER); if (lastDividerLocation >= 0) { pane.setDividerLocation(lastDividerLocation); } c.validate(); c.repaint(); } }); JPanel buttons = new JPanel(); buttons.setLayout(new GridBagLayout()); buttons.add(showleft); buttons.add(showright); buttons.add(showboth); frame.getContentPane().add(buttons, BorderLayout.NORTH); pane.setPreferredSize(new Dimension(400, 300)); frame.getContentPane().add(pane, BorderLayout.CENTER); frame.pack(); pane.setDividerLocation(0.5); return frame; } } Thanks Sunil kumar Sahoo

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  • Implement OAuth in Java

    - by phineas
    I made an an attempt to implement OAuth for my programming idea in Java, but I failed miserably. I don't know why, but my code doesn't work. Every time I run my program, an IOException is thrown with the reason "java.io.IOException: Server returned HTTP response code: 401" (401 means Unauthorized). I had a close look at the docs, but I really don't understand why it doesn't work. My OAuth provider I wanted to use is twitter, where I've registered my app, too. Thanks in advance phineas OAuth docs Twitter API wiki Class Base64Coder import java.io.InputStreamReader; import java.io.BufferedReader; import java.io.OutputStream; import java.io.IOException; import java.io.UnsupportedEncodingException; import java.net.URL; import java.net.URLEncoder; import java.net.URLConnection; import java.net.MalformedURLException; import javax.crypto.Mac; import javax.crypto.spec.SecretKeySpec; import java.security.NoSuchAlgorithmException; import java.security.InvalidKeyException; public class Request { public static String read(String url) { StringBuffer buffer = new StringBuffer(); try { /** * get the time - note: value below zero * the millisecond value is used for oauth_nonce later on */ int millis = (int) System.currentTimeMillis() * -1; int time = (int) millis / 1000; /** * Listing of all parameters necessary to retrieve a token * (sorted lexicographically as demanded) */ String[][] data = { {"oauth_callback", "SOME_URL"}, {"oauth_consumer_key", "MY_CONSUMER_KEY"}, {"oauth_nonce", String.valueOf(millis)}, {"oauth_signature", ""}, {"oauth_signature_method", "HMAC-SHA1"}, {"oauth_timestamp", String.valueOf(time)}, {"oauth_version", "1.0"} }; /** * Generation of the signature base string */ String signature_base_string = "POST&"+URLEncoder.encode(url, "UTF-8")+"&"; for(int i = 0; i < data.length; i++) { // ignore the empty oauth_signature field if(i != 3) { signature_base_string += URLEncoder.encode(data[i][0], "UTF-8") + "%3D" + URLEncoder.encode(data[i][1], "UTF-8") + "%26"; } } // cut the last appended %26 signature_base_string = signature_base_string.substring(0, signature_base_string.length()-3); /** * Sign the request */ Mac m = Mac.getInstance("HmacSHA1"); m.init(new SecretKeySpec("CONSUMER_SECRET".getBytes(), "HmacSHA1")); m.update(signature_base_string.getBytes()); byte[] res = m.doFinal(); String sig = String.valueOf(Base64Coder.encode(res)); data[3][1] = sig; /** * Create the header for the request */ String header = "OAuth "; for(String[] item : data) { header += item[0]+"=\""+item[1]+"\", "; } // cut off last appended comma header = header.substring(0, header.length()-2); System.out.println("Signature Base String: "+signature_base_string); System.out.println("Authorization Header: "+header); System.out.println("Signature: "+sig); String charset = "UTF-8"; URLConnection connection = new URL(url).openConnection(); connection.setDoInput(true); connection.setDoOutput(true); connection.setRequestProperty("Accept-Charset", charset); connection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded;charset=" + charset); connection.setRequestProperty("Authorization", header); connection.setRequestProperty("User-Agent", "XXXX"); OutputStream output = connection.getOutputStream(); output.write(header.getBytes(charset)); BufferedReader reader = new BufferedReader(new InputStreamReader(connection.getInputStream())); String read; while((read = reader.readLine()) != null) { buffer.append(read); } } catch(Exception e) { e.printStackTrace(); } return buffer.toString(); } public static void main(String[] args) { System.out.println(Request.read("http://api.twitter.com/oauth/request_token")); } }

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  • JavaMail - javax.mail.MessagingException

    - by legendofawesomeness
    I am trying to write a simple mail sender class that would receive a bunch of arguments and using those will send an email out using our Exchange 2010 server. While authentication etc. seem to work fine, I am getting the following exception when the code is actually trying to send the email (I think). I have ensured that the authentication is working and I get a transport back from the session, but still it fails. Could anyone shed some like on what I am doing wrong or missing? Thanks. Exception: javax.mail.MessagingException: [EOF] at com.sun.mail.smtp.SMTPTransport.issueCommand(SMTPTransport.java:1481) at com.sun.mail.smtp.SMTPTransport.issueSendCommand(SMTPTransport.java:1512) at com.sun.mail.smtp.SMTPTransport.mailFrom(SMTPTransport.java:1054) at com.sun.mail.smtp.SMTPTransport.sendMessage(SMTPTransport.java:634) at javax.mail.Transport.send0(Transport.java:189) at javax.mail.Transport.send(Transport.java:140) at com.ri.common.mail.util.MailSender.sendHTMLEmail(MailSender.java:75) at com.ri.common.mail.util.MailSender.main(MailSender.java:106) Relevant code: import java.util.Properties; import javax.mail.Authenticator; import javax.mail.Message; import javax.mail.MessagingException; import javax.mail.PasswordAuthentication; import javax.mail.Session; import javax.mail.Transport; import javax.mail.internet.InternetAddress; import javax.mail.internet.MimeMessage; public class MailSender { public static void sendHTMLEmail( String fromEmailId, String toEmailId, String host, String hostUserName, String hostPassword, String mailSubject, String mailBody ) { // Get system properties. Properties props = System.getProperties(); // Setup mail server props.put( "mail.transport.protocol", "smtp" ); props.put( "mail.smtp.host", host ); props.put( "mail.smtp.auth", "true" ); final String hostUName = hostUserName; final String hPassword = hostPassword; Authenticator authenticator = new Authenticator() { protected PasswordAuthentication getPasswordAuthentication() { return new PasswordAuthentication( hostUName, hPassword ); } }; // Get the default Session object. Session session = Session.getDefaultInstance( props, authenticator ); try { // Create a default MimeMessage object. MimeMessage message = new MimeMessage( session ); // Set From: header field of the header. message.setFrom( new InternetAddress( fromEmailId ) ); // Set To: header field of the header. message.addRecipient( Message.RecipientType.TO, new InternetAddress( toEmailId ) ); // Set Subject: header field message.setSubject( mailSubject ); // Send the actual HTML message, as big as you like message.setContent( mailBody, "text/html" ); // Send message Transport.send( message, message.getAllRecipients() ); System.out.println( "Sent message successfully...." ); } catch( Exception mex ) { mex.printStackTrace(); } } public static void main( String[] args ) { String to = "[email protected]"; String from = "[email protected]"; String host = "correctHostForExch2010"; String user = "correctUser"; String password = "CorrectPassword"; String subject = "Test Email"; String body = "Hi there. This is a test email!"; MailSender.sendHTMLEmail( from, to, host, user, password, subject, body ); } } EDIT: I turned on debugging and it says MAIL FROM:<[email protected]> 530 5.7.1 Client was not authenticated DEBUG SMTP: got response code 530, with response: 530 5.7.1 Client was not authenticated. Why would that be when the session authentication succeded?

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  • Creating a Serializable mock with Mockito error

    - by KwintenP
    I'm trying to create a mock object with Mockito that can be serialized. The object is an interface implementation. When this method is called, I receive an object that I want to pass to another object, hence using the doAnswer(...)-method. This is my code. InterfaceClass obj = mock(InterfaceClass.class, withSettings().serializable()); doAnswer(new Answer<Object>() { public Object answer(InvocationOnMock invocation) throws Throwable { Object[] args = invocation.getArguments(); //Here I do something with the arguments } }).when(obj).someMethod( any(someObject.class)); ByteArrayOutputStream bos = new ByteArrayOutputStream(); ObjectOutput out = null; try { out = new ObjectOutputStream(bos); out.writeObject(obj); byte[] yourBytes = bos.toByteArray(); } finally { out.close(); bos.close(); } As far as I can tell this should be correct (I'm fairly new to Mockito). But when Serializing my object I get this error: java.io.NotSerializableException: com.trust1t.ocs.signcore.test.InvalidInputTestCase$1 at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1165) at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:329) at java.util.concurrent.ConcurrentLinkedQueue.writeObject(ConcurrentLinkedQueue.java:644) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:950) at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1482) at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1413) at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1159) at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1535) at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1496) at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1413) at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1159) at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:329) at java.util.LinkedList.writeObject(LinkedList.java:943) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:950) at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1482) at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1413) at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1159) at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1535) at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1496) at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1413) at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1159) at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1535) at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1496) at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1413) at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1159) at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1535) at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1496) at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1413) at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1159) at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1535) at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1496) at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1413) at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1159) at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:329) at com.trust1t.ocs.signcore.test.InvalidInputTestCase.certificateValidationTest(InvalidInputTestCase.java:117) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:47) at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12) at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:44) at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17) at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:271) at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:70) at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50) at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238) at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63) at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236) at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53) at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229) at org.junit.runners.ParentRunner.run(ParentRunner.java:309) at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50) at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197) The invalidInputTestCase class is the class containing the test where I'm using this code. It looks as if the mock object references this TestCase somewhere (can't find it though). Am I not correctly implementing this or better ideas to mock?

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  • KVM Guest installed from console. But how to get to the guest's console?

    - by badbishop
    I'm trying to install a fully virtualized guest (Fedora 14 x86_64) on KVM (RHEL 6), using command-line only (both hypervisor and guest). It goes without errors, and without a tangible result . I'd like to know how to do a text-only installation. So, here's what I've done: # virt-install \ --name=FE --ram=756 --vcpus=1 \ --file=/var/lib/libvirt/images/FE.img --network bridge:br0 \ --nographics --os-type=linux \ --extra-args='console=tty0' -v \ --cdrom=/media/usb/Fedora-14-x86_64-Live-Desktop.iso Starting install... Creating domain... | 0 B 00:00 Connected to domain FE Escape character is ^] ÿ Now what? As I understand after googling for a couple of days, I should see the guest's output from the text installation, but nothing happens. virt-viewer cannot connect to it, kindly suggesting that I explore all the options by adding --help (which I did). If I reconnect with virsh, I see this: Domain installation still in progress. You can reconnect to the console to complete the installation process. [root@v ~] # virsh console FEConnected to domain FE Escape character is ^] This shows that VM is running # virsh list Id Name State ---------------------------------- 8 FE running Qemu log: LC_ALL=C PATH=/sbin:/usr/sbin:/bin:/usr/bin /usr/libexec/qemu-kvm -S -M rhel6.0.0 -enable-kvm -m 756 -smp 1,sockets=1,cores=1,threads=1 -name FE -uuid 6989d008-7c89-424c-d2d3-f41235c57a18 -nographic -nodefconfig -nodefaults -chardev socket,id=monitor,path=/var/lib/libvirt/qemu/FE.monitor,server,nowait -mon chardev=monitor,mode=control -rtc base=utc -no-reboot -boot d -drive file=/var/lib/libvirt/images/FE.img,if=none,id=drive-ide0-0-0,format=raw,cache=none -device ide-drive,bus=ide.0,unit=0,drive=drive-ide0-0-0,id=ide0-0-0 -drive file=/media/usb/Fedora-14-x86_64-Live-Desktop.iso,if=none,media=cdrom,id=drive-ide0-1-0,readonly=on,format=raw -device ide-drive,bus=ide.1,unit=0,drive=drive-ide0-1-0,id=ide0-1-0 -netdev tap,fd=20,id=hostnet0 -device rtl8139,netdev=hostnet0,id=net0,mac=52:54:00:0a:65:8d,bus=pci.0,addr=0x2 -chardev pty,id=serial0 -device isa-serial,chardev=serial0 -usb -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x3 char device redirected to /dev/pts/1 Output of /etc/libvirt/qemu/FE.xml # cat /etc/libvirt/qemu/FE.xml <domain type='kvm'> <name>FE</name> <uuid>6989d008-7c89-424c-d2d3-f41235c57a18</uuid> <memory>774144</memory> <currentMemory>774144</currentMemory> <vcpu>1</vcpu> <os> <type arch='x86_64' machine='rhel6.0.0'>hvm</type> <boot dev='hd'/> </os> <features> <acpi/> <apic/> <pae/> </features> <clock offset='utc'/> <on_poweroff>destroy</on_poweroff> <on_reboot>restart</on_reboot> <on_crash>restart</on_crash> <devices> <emulator>/usr/libexec/qemu-kvm</emulator> <disk type='file' device='disk'> <driver name='qemu' type='raw' cache='none'/> <source file='/var/lib/libvirt/images/FE.img'/> <target dev='hda' bus='ide'/> <address type='drive' controller='0' bus='0' unit='0'/> </disk> <disk type='block' device='cdrom'> <driver name='qemu' type='raw'/> <target dev='hdc' bus='ide'/> <readonly/> <address type='drive' controller='0' bus='1' unit='0'/> </disk> <controller type='ide' index='0'> <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x1'/> </controller> <interface type='bridge'> <mac address='52:54:00:0a:65:8d'/> <source bridge='br0'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/> </interface> <serial type='pty'> <target port='0'/> </serial> <console type='pty'> <target port='0'/> </console> <memballoon model='virtio'> <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/> </memballoon> </devices> </domain> I'm obviously missing something that many others don't, but what is it? Thanx in advance!

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  • How do i use GraphMLReader2 in Jung?

    - by askus
    I want to use class GraphMLReader to read a Undirected Graph from graphML with JUNG2.0. The code is as follow: import edu.uci.ics.jung.io.*; import edu.uci.ics.jung.io.graphml.*; import java.io.*; import java.util.*; import org.apache.commons.collections15.Transformer; import edu.uci.ics.jung.graph.*; class Vertex{ int id; String type; String value; } class Edge{ int id ; String type; String value; } public class Loader{ static String src = "test.xsl"; public static void Main( String[] args){ Reader reader = new FileReader(src ); Transformer<NodeMetadata, Vertex> vtrans = new Transformer<NodeMetadata,Vertex>(){ public Vertex transform(NodeMetadata nmd ){ Vertex v = new Vertex() ; v.type = nmd.getProperty("type"); v.value = nmd.getProperty("value"); v.id = Integer.valueOf( nmd.getId() ); return v; } }; Transformer<EdgeMetadata, Edge> etrans = new Transformer<EdgeMetadata,Edge>(){ public Edge transform( EdgeMetadata emd ){ Edge e = new Edge() ; e.type = emd.getProperty("type"); e.value = emd.getProperty("value"); e.id = Integer.valueOf( emd.getId() ); return e; } }; Transformer<HyperEdgeMetadata, Edge> hetrans = new Transformer<HyperEdgeMetadata,Edge>(){ public Edge transform( HyperEdgeMetadata emd ){ Edge e = new Edge() ; e.type = emd.getProperty("type"); e.value = emd.getProperty("value"); e.id = Integer.valueOf( emd.getId() ); return e; } }; Transformer< GraphMetadata , UndirectedSparseGraph> gtrans = new Transformer<GraphMetadata,UndirectedSparseGraph>(){ public UndirectedSparseGraph<Vertex,Edge> transform( GraphMetadata gmd ){ return new UndirectedSparseGraph<Vertex,Edge>(); } }; GraphMLReader2< UndirectedSparseGraph<Vertex,Edge> , Vertex , Edge> gmlr = new GraphMLReader2< UndirectedSparseGraph<Vertex,Edge> ,Vertex, Edge>( reader, gtrans, vtrans, etrans, hetrans); UndirectedSparseGraph<Vertex,Edge> g = gmlr.readGraph(); return ; } } However, compiler alert that: Loader.java:60: cannot find symbol symbol : constructor GraphMLReader2(java.io.Reader,org.apache.commons.collections15.Transformer<edu.uci.ics.jung.io.graphml.GraphMetadata,edu.uci.ics.jung.graph.UndirectedSparseGraph>,org.apache.commons.collections15.Transformer<edu.uci.ics.jung.io.graphml.NodeMetadata,Vertex>,org.apache.commons.collections15.Transformer<edu.uci.ics.jung.io.graphml.EdgeMetadata,Edge>) location: class edu.uci.ics.jung.io.graphml.GraphMLReader2<edu.uci.ics.jung.graph.UndirectedSparseGraph<Vertex,Edge>,Vertex,Edge> new GraphMLReader2< UndirectedSparseGraph<Vertex,Edge> ,Vertex, Edge>( ^ 1 error How can i solve this problem? Thanks.

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  • Blackberry - Running Background Application

    - by Leandro
    Good afternoon. I'm starting programming in java and blackberry. I am developing an application with three windows, which I will show basic information about the device, these windows are already done and working. I need to create a process running in the background, this process will run every 10 minutes. As I make this process run in the background and is working to close the windows? This is the kind that runs the application: public class InfoBerry extends UiApplication{ public vtnprincipal vtnprincipal; public vtnbateria vtnbateria; public vtnestado vtnestado ; public vtnacerca vtnacerca; public InfoBerry(){ } public static void main(String[] args) { InfoBerry theApp = new InfoBerry(); theApp.mostrarpantalla(); } public void mostrarpantalla(){ vtnprincipal = new vtnprincipal(this); vtnbateria = new vtnbateria(this); vtnestado = new vtnestado(this); vtnacerca = new vtnacerca(this); // Inicailizamos los componentes de la pantalla principal vtnprincipal.incventana(); // La pnemos en lo alto de la pila de pantallas pushScreen(this.vtnprincipal); } } And this is the class you need to run in the background. As I have to make the call to this class to run in the background? class iconnoti extends MainScreen{ //icono de la temperatura EncodedImage imgtem = EncodedImage.getEncodedImageResource("icon_bateria_t.png"); ApplicationIcon icontem = new ApplicationIcon(imgtem); //icono de la carga de la bateria EncodedImage imgcarga = EncodedImage.getEncodedImageResource("icon_bateria.png"); ApplicationIcon iconcarga = new ApplicationIcon(imgcarga); //icono de la memoria EncodedImage imgmemo = EncodedImage.getEncodedImageResource("icon_memoria.png"); ApplicationIcon iconmemo = new ApplicationIcon(imgmemo); ApplicationIcon mIcon = icontem; boolean act; public iconnoti() { } public void rotar_temperatura(){ cron c1; actualizar_icono(icontem); actualizar_valor(DeviceInfo.getBatteryTemperature()); c1 = new cron(2,10000); c1.start(); } public void rotar_memoria(){ cron c1; actualizar_icono(iconmemo); actualizar_valor(34); c1 = new cron(3,10000); c1.start(); } public void rotar_nivel(){ cron c1; actualizar_icono(iconcarga); actualizar_valor(DeviceInfo.getBatteryLevel()); c1 = new cron(1,10000); c1.start(); } public void iniciar_servicio() { try { ApplicationIndicatorRegistry reg = ApplicationIndicatorRegistry.getInstance(); ApplicationIndicator Indicator = reg.register(mIcon, false, true); } catch (Exception e) { } } public void parar_servicio() { try { ApplicationIndicatorRegistry reg = ApplicationIndicatorRegistry.getInstance(); reg.unregister(); } catch (Exception e) { } } void actualizar_valor(int value) { try { ApplicationIndicatorRegistry reg = ApplicationIndicatorRegistry.getInstance(); ApplicationIndicator appIndicator = reg.getApplicationIndicator(); appIndicator.setValue(value); } catch (Exception e) { } } void actualizar_icono(ApplicationIcon icon) { try { ApplicationIndicatorRegistry reg = ApplicationIndicatorRegistry.getInstance(); ApplicationIndicator appIndicator = reg.getApplicationIndicator(); appIndicator.setIcon(icon); } catch (Exception e) { } } } class cron extends Thread { //private ApplicationIcon icono; public int valor; private int tiempo; iconnoti icon = new iconnoti(); public cron(int v, int t){ valor = v; tiempo = t; } public void run() { try { sleep(tiempo); } catch (InterruptedException e) { } if(valor == 1){ icon.rotar_temperatura(); }else if(valor == 2){ icon.rotar_memoria(); }else if(valor == 3){ icon.rotar_nivel(); } } } Thanks for the help.

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  • WCF REST Question, Binding, Configuration

    - by Ethan McGee
    I am working on a WCF rest interface using json. I have wrapped the service in a windows service to host the service but I am now having trouble getting the service to be callable. I am not sure exactly what is wrong. The basic idea is that I want to host the service on a remote server so I want the service mapped to port localhost:7600 so that it can be invoked by posting data to [server_ip]:7600. The problem is most likely in the configuration file, since I am new to WCF and Rest I wasn't really sure what to type for the configuration so sorry if it's a total mess. I removed several chunks of code and comments to make it a little easier to read. These functions should have no bearing on the service since they call only C# functions. WCF Service Code using System; using System.Collections.Generic; using System.Linq; using System.ServiceModel; using System.ServiceModel.Activation; using System.ServiceModel.Web; using System.Text; namespace PCMiler_Connect { public class ZIP_List_Container { public string[] ZIP_List { get; set; } public string Optimized { get; set; } public string Calc_Type { get; set; } public string Cross_International_Borders { get; set; } public string Use_Kilometers { get; set; } public string Hazard_Level { get; set; } public string OK_To_Change_Destination { get; set; } } [ServiceContract] [AspNetCompatibilityRequirements(RequirementsMode = AspNetCompatibilityRequirementsMode.Allowed)] [ServiceBehavior(InstanceContextMode = InstanceContextMode.PerCall)] public class PCMiler_Webservice { [WebInvoke(Method = "POST", UriTemplate = "", ResponseFormat = WebMessageFormat.Json, RequestFormat = WebMessageFormat.Json), OperationContract] public List<string> Calculate_Distance(ZIP_List_Container container) { return new List<string>(){ distance.ToString(), time.ToString() }; } } } XML Config File <?xml version="1.0" encoding="utf-8"?> <configuration> <system.serviceModel> <services> <service name="PCMiler_Connect.PCMiler_Webservice"> <endpoint address="" behaviorConfiguration="jsonBehavior" binding="webHttpBinding" bindingConfiguration="" contract="PCMiler_Connect.PCMiler_Webservice" /> <host> <baseAddresses> <add baseAddress="http://localhost:7600/" /> </baseAddresses> </host> </service> </services> <behaviors> <endpointBehaviors> <behavior name="jsonBehavior"> <enableWebScript/> </behavior> </endpointBehaviors> </behaviors> </system.serviceModel> </configuration> Service Wrapper using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Diagnostics; using System.Linq; using System.ServiceProcess; using System.ServiceModel; using System.Text; using System.Threading; namespace PCMiler_WIN_Service { public partial class Service1 : ServiceBase { ServiceHost host; public Service1() { InitializeComponent(); } protected override void OnStart(string[] args) { host = new ServiceHost(typeof(PCMiler_Connect.PCMiler_Webservice)); Thread thread = new Thread(new ThreadStart(host.Open)); } protected override void OnStop() { if (host != null) { host.Close(); host = null; } } } }

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  • Why a graphics overflow problem as a result of a for loop?

    - by sonny5
    using System; using System.Drawing; using System.Collections; using System.ComponentModel; using System.Windows.Forms; using System.Data; using System.Drawing.Imaging; using System.Drawing.Drawing2D; public class Form1 : System.Windows.Forms.Form { public static float WXmin; public static float WYmin; public static float WXmax; public static float WYmax; public static int VXmin; public static int VYmin; public static int VXmax; public static int VYmax; public static float Wx; public static float Wy; public static float Vx; public static float Vy; public Form1() { InitializeComponent(); } private void InitializeComponent() { this.ClientSize = new System.Drawing.Size(400, 300); this.Text="Pass Args"; this.Paint += new System.Windows.Forms.PaintEventHandler(this.doLine); //this.Paint += new System.PaintEventHandler(this.eachCornerPix); //eachCornerPix(out Wx, out Wy, out Vx, out Vy); } static void Main() { Application.Run(new Form1()); } private void doLine(object sender, System.Windows.Forms.PaintEventArgs e) { Graphics g = e.Graphics; g.FillRectangle(Brushes.White, this.ClientRectangle); Pen p = new Pen(Color.Black); g.DrawLine(p, 0, 0, 100, 100); // draw DOWN in y, which is positive since no matrix called eachCornerPix(sender, e, out Wx, out Wy, out Vx, out Vy); p.Dispose(); } private void eachCornerPix (object sender, System.EventArgs e, out float Wx, out float Wy, out float Vx, out float Vy) { Wx = 0.0f; Wy = 0.0f; Vx = 0.0f; Vy = 0.0f; Graphics g = this.CreateGraphics(); Pen penBlu = new Pen(Color.Blue, 2); SolidBrush redBrush = new SolidBrush(Color.Red); int width = 2; // 1 pixel wide in x int height = 2; float [] Wxc = {0.100f, 5.900f, 5.900f, 0.100f}; float [] Wyc = {0.100f, 0.100f, 3.900f, 3.900f}; Console.WriteLine("Wxc[0] = {0}", Wxc[0]); Console.WriteLine("Wyc[3] = {0}", Wyc[3]); /* for (int i = 0; i<3; i++) { Wx = Wxc[i]; Wy = Wyc[i]; Vx = ((Wx - WXmin)*((VXmax-VXmin)+VXmin)/(WXmax-WXmin)); Vy = ((Wy - WYmin)*(VYmax-VYmin)/(WYmax-WYmin)+VYmin); Console.WriteLine("eachCornerPix Vx= {0}", Vx); Console.WriteLine("eachCornerPix Vy= {0}", Vy); g.FillRectangle(redBrush, Vx, Vy, width, height); } */ // What is there about this for loop that will not run? // When the comments above and after the for loop are removed, it gets an overflow? g.Dispose(); } }

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  • HttpParsing for hypertext

    - by Nani
    I am in process of getting all hierarchical links from a given link and validating them; This is the code I wrote. But I am not feeling it as efficient. Reasons are: 1.For the non unique links which open same page, code is getting sub-links again and again 2.Is the code getting all links? 3.Is it making valid URLs from the sub-links it derived? 4.May be some other reasons about which I have no idea. Please suggest me how to make this piece of code efficient . Thank you. class Program { public static ArrayList sublink = new ArrayList(); public static ArrayList subtitle = new ArrayList(); public static int ini = 0, len_o, len_n, counter = 0; static void Main(string[] args) { // Address of URL string URL = "http://www.techonthenet.com/"; sublink.Add(URL); l: len_o = sublink.Count; len_o); Console.WriteLine("-------------Level:" + counter++); for (int i = ini; i < len_o; i++) test(sublink[i].ToString()); len_n = sublink.Count; if (len_o < len_n) { ini = len_o; goto l; } Console.ReadKey(); } //method to get the sub-links public static void test(string URL) { try { // Get HTML data WebClient client = new WebClient(); Stream data = client.OpenRead(URL); StreamReader reader = new StreamReader(data); string str = "", htmldata = "", temp; int n1, n2; str = reader.ReadLine(); while (str != null) { htmldata += str; str = reader.ReadLine(); } data.Close(); for (int i = 0; i < htmldata.Length - 5; i++) { if (htmldata.Substring(i, 5) == "href=") { n1 = htmldata.Substring(i + 6, htmldata.Length - (i + 6)).IndexOf("\""); temp = htmldata.Substring(i + 6, n1); if (temp.Length > 4 && temp.Substring(0, 4) != "http") { if(temp.Substring(0,1)!="/") temp=URL.Substring(0,URL.IndexOf(".com/")+5)+temp; else temp = URL.Substring(0, URL.IndexOf(".com/") + 5) + temp.Remove(0,1); } if (temp.Length < 4) temp = URL.Substring(0, URL.IndexOf(".com/") + 5) + temp; sublink.Add(temp); n2 = htmldata.Substring(i + n1 + 1, htmldata.Length - (i + n1 + 1)).IndexOf("<"); subtitle.Add(htmldata.Substring(i + 6 + n1 + 2, n2 - 7)); i += temp.Length + htmldata.Substring(i + 6 + n1 + 2, n2 - 7).Length; } } for (int i = len_n; i < sublink.Count; i++) Console.WriteLine(i + "--> " + sublink[i]); } catch (WebException exp) { Console.WriteLine("URL Could not be Resolved" + URL); Console.WriteLine(exp.Message, "Exception"); } } }

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  • Partial generic type inference possible in C#?

    - by Lasse V. Karlsen
    I am working on rewriting my fluent interface for my IoC class library, and when I refactored some code in order to share some common functionality through a base class, I hit upon a snag. Note: This is something I want to do, not something I have to do. If I have to make do with a different syntax, I will, but if anyone has an idea on how to make my code compile the way I want it, it would be most welcome. I want some extension methods to be available for a specific base-class, and these methods should be generic, with one generic type, related to an argument to the method, but the methods should also return a specific type related to the particular descendant they're invoked upon. Better with a code example than the above description methinks. Here's a simple and complete example of what doesn't work: using System; namespace ConsoleApplication16 { public class ParameterizedRegistrationBase { } public class ConcreteTypeRegistration : ParameterizedRegistrationBase { public void SomethingConcrete() { } } public class DelegateRegistration : ParameterizedRegistrationBase { public void SomethingDelegated() { } } public static class Extensions { public static ParameterizedRegistrationBase Parameter<T>( this ParameterizedRegistrationBase p, string name, T value) { return p; } } class Program { static void Main(string[] args) { ConcreteTypeRegistration ct = new ConcreteTypeRegistration(); ct .Parameter<int>("age", 20) .SomethingConcrete(); // <-- this is not available DelegateRegistration del = new DelegateRegistration(); del .Parameter<int>("age", 20) .SomethingDelegated(); // <-- neither is this } } } If you compile this, you'll get: 'ConsoleApplication16.ParameterizedRegistrationBase' does not contain a definition for 'SomethingConcrete' and no extension method 'SomethingConcrete'... 'ConsoleApplication16.ParameterizedRegistrationBase' does not contain a definition for 'SomethingDelegated' and no extension method 'SomethingDelegated'... What I want is for the extension method (Parameter<T>) to be able to be invoked on both ConcreteTypeRegistration and DelegateRegistration, and in both cases the return type should match the type the extension was invoked on. The problem is as follows: I would like to write: ct.Parameter<string>("name", "Lasse") ^------^ notice only one generic argument but also that Parameter<T> returns an object of the same type it was invoked on, which means: ct.Parameter<string>("name", "Lasse").SomethingConcrete(); ^ ^-------+-------^ | | +---------------------------------------------+ .SomethingConcrete comes from the object in "ct" which in this case is of type ConcreteTypeRegistration Is there any way I can trick the compiler into making this leap for me? If I add two generic type arguments to the Parameter method, type inference forces me to either provide both, or none, which means this: public static TReg Parameter<TReg, T>( this TReg p, string name, T value) where TReg : ParameterizedRegistrationBase gives me this: Using the generic method 'ConsoleApplication16.Extensions.Parameter<TReg,T>(TReg, string, T)' requires 2 type arguments Using the generic method 'ConsoleApplication16.Extensions.Parameter<TReg,T>(TReg, string, T)' requires 2 type arguments Which is just as bad. I can easily restructure the classes, or even make the methods non-extension-methods by introducing them into the hierarchy, but my question is if I can avoid having to duplicate the methods for the two descendants, and in some way declare them only once, for the base class. Let me rephrase that. Is there a way to change the classes in the first code example above, so that the syntax in the Main-method can be kept, without duplicating the methods in question? The code will have to be compatible with both C# 3.0 and 4.0. Edit: The reason I'd rather not leave both generic type arguments to inference is that for some services, I want to specify a parameter value for a constructor parameter that is of one type, but pass in a value that is a descendant. For the moment, matching of specified argument values and the correct constructor to call is done using both the name and the type of the argument. Let me give an example: ServiceContainerBuilder.Register<ISomeService>(r => r .From(f => f.ConcreteType<FileService>(ct => ct .Parameter<Stream>("source", new FileStream(...))))); ^--+---^ ^---+----^ | | | +- has to be a descendant of Stream | +- has to match constructor of FileService If I leave both to type inference, the parameter type will be FileStream, not Stream.

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  • JFrame not working correctly

    - by Nick Gibson
    This is making me very angry, I have worked on this for 2 days, have 2 books open and have looked through them, and STILL can't get this program to run the way I want it run. I'm getting to the point where if this doesn't help, I quit. I want a SIMPLE Frame application. It has a JComboBox centered at the top. Next to it is a text field big enough to show numeric digits such as "$49.99" Below it is a spot for a Text area showing terms of service Below that is the checkbox agreeing to the terms of service Below that is 2 buttons "Accept" and "Decline" I Have worked on this for 2 days, here is the coding: public class Bar extends JFrame implements ActionListener { public Bar(final JFrame frame) { String[] tests = { "A+ Certification", "Network+ Certification", "Security+ Certification", "CIT Full Test Package" }; JButton button = new JButton("Click Meh"); add(new JLabel("Welcome to the CIT Test Program ")); add(new JLabel("Please select which Test Package from the list below.")); frame.setVisible(true); frame.setSize(250,250); JPanel pane1 = new JPanel(new FlowLayout()); JPanel pane2 = new JPanel(new FlowLayout()); JMenuBar menuBar = new JMenuBar(); JMenu fileMenu = new JMenu("File"); JMenu editMenu = new JMenu("Edit"); JMenu helpMenu = new JMenu("Help"); menuBar.add(fileMenu); menuBar.add(editMenu); menuBar.add(helpMenu); JMenuItem newMenu = new JMenuItem("New (Ctrl+N)"); JMenuItem openMenu = new JMenuItem("Open (Ctrl+O)"); JMenuItem saveMenu = new JMenuItem("Save (Ctrl+S)"); saveMenu.addActionListener(this); JMenuItem exitMenu = new JMenuItem("Exit (Ctrl+W)"); JMenuItem cutMenu = new JMenuItem("Cut (Ctrl+X)"); JMenuItem copyMenu = new JMenuItem("Copy (Ctrl+C)"); JMenuItem pasteMenu = new JMenuItem("Paste (Ctrl+V)"); JMenuItem infoMenu = new JMenuItem("Help (Ctrl+H)"); fileMenu.add(newMenu); fileMenu.add(openMenu); fileMenu.add(saveMenu); fileMenu.add(exitMenu); editMenu.add(cutMenu); editMenu.add(copyMenu); editMenu.add(pasteMenu); helpMenu.add(infoMenu); frame.setJMenuBar(menuBar); JComboBox packageChoice = new JComboBox(tests); frame.add(packageChoice); } public void actionPerformed(ActionEvent e) { Object source = e.getSource(); { } } EDIT: Forgot to add the second program public class JFrameWithPanel { public static void main(String[] args) { JPanel panel = new Bar(new JFrame("CIT Test Program")); } } How do I get this to have everything where I want it and show up? I'm very confused because of this and now barely even get how Frames work.

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  • Chatbot client and class modification

    - by blake
    ChatBot Class Modification: Modify the reply() method of the ChatBot class to recognize additional words and phrases. Part 1: Everyone must complete this section. When the userInput parameter value is: The reply method should return: how do I quit enter quit how do I exit enter quit how do I stop enter quit how do I ____ do you really want to do that how are you I'm fine how ______ I don't know Add two additional words or phrases to recognize and respond to. ChatBot Client Modification: Modify the ChatBot client application to loop until the end-user enters "quit". Here is my service class / ** * Java Chatbot Service class * @author Blake * 3/5/2012 */ /** * Default constructor. */ public class Chatbot { private String name; /** Users name */ private String introbot; /** Name of the Chatbot */ private String reply; /** Replies to the input of the string name and string introbot */ /** * Constructs mutebot object * @param mutebow - returns name of mutebot */ public Chatbot() { name = "MuteBot"; } /** * Changes Name * @param name - new name */ public void setName (String n) { name = n; } /** * Accesses name * @return a brand new name */ public String getName() { return name; } /** * Accesses introbot * @return name of mutebot */ public String introbot() { String intro = "Hello! My name is " + name; return intro; } /** * Accesses replay(String newuserinput) * @return introbot reply to user input */ public String getreply(String newuserinput) { String reply = "I'm just learning to talk"; if (newuserinput.equalsIgnoreCase("What")) reply = "Why do you ask?"; else if (newuserinput.equalsIgnoreCase("Why") ) reply = "Why Not"; else if (newuserinput.equalsIgnoreCase("How")) reply = "I don't know!"; else if (newuserinput.equalsIgnoreCase("Where") ) reply = "Anne Arundel Community College"; else if (newuserinput.equalsIgnoreCase("When")) reply = "Tomorrow"; else if (newuserinput.equalsIgnoreCase("how do I quit")) reply = "enter quit"; else if (newuserinput.equalsIgnoreCase("how do I exit")) reply = "enter quit"; else if (newuserinput.equalsIgnoreCase("how do I stop")) reply = "enter quit"; else if (newuserinput.equalsIgnoreCase("how are you")) reply = "I'm fine"; else if (newuserinput.equalsIgnoreCase("how do you do")) reply = "I am doing well"; else if (newuserinput.equalsIgnoreCase("how do I get out")) reply = "By going through the door"; else if (newuserinput.indexOf("how do I" ) ==0) { String substring = newuserinput.substring(8); reply = "do you really want to do that" + substring; } else if (newuserinput.indexOf("how" ) ==0) { String substring = newuserinput.substring(10); reply = "I don't know" + substring ; } return reply; } } Here is my client/application class /** * Java Chatbot Client class * @author Blake * 3/5/2012 */ import java.util.Scanner; public class ChatbotClient { public static void main(String[] args) { Scanner input = new Scanner(System.in); Chatbot t = new Chatbot(); System.out.print("What is your name? "); String name = input.nextLine(); System.out.println(t.introbot()); System.out.print(name + "> "); String reply = input.nextLine(); System.out.println(t.getName() + "> " + t.getreply(reply)); //while (reply < quit) /*{ quit++ i = i + 1 }*/ } } I don't know what I am doing wrong with this part right here Modify the ChatBot client application to loop until the end-user enters "quit". I am trying to create a while loop which will continue until user says quit.

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  • Why doesn't my implementation of ElGamal work for long text strings?

    - by angstrom91
    I'm playing with the El Gamal cryptosystem, and my goal is to be able to encipher and decipher long sequences of text. I have come up with a method that works for short sequences, but does not work for long sequences, and I cannot figure out why. El Gamal requires the plaintext to be an integer. I have turned my string into a byte[] using the .getBytes() method for Strings, and then created a BigInteger out of the byte[]. After encryption/decryption, I turn the BigInteger into a byte[] using the .toByteArray() method for BigIntegers, and then create a new String object from the byte[]. This works perfectly when i call ElGamalEncipher with strings up to 129 characters. With 130 or more characters, the output produced from ElGamalDecipher is garbled. Can someone suggest how to solve this issue? Is this an issue with my method of turning the string into a BigInteger? If so, is there a better way to turn my string of text into a BigInteger and back? Below is my encipher/decipher code with a program to demonstrate the problem. import java.math.BigInteger; public class Main { static BigInteger P = new BigInteger("15893293927989454301918026303382412" + "2586402937727056707057089173871237566896685250125642378268385842" + "6917261652781627945428519810052550093673226849059197769795219973" + "9423619267147615314847625134014485225178547696778149706043781174" + "2873134844164791938367765407368476144402513720666965545242487520" + "288928241768306844169"); static BigInteger G = new BigInteger("33234037774370419907086775226926852" + "1714093595439329931523707339920987838600777935381196897157489391" + "8360683761941170467795379762509619438720072694104701372808513985" + "2267495266642743136795903226571831274837537691982486936010899433" + "1742996138863988537349011363534657200181054004755211807985189183" + "22832092343085067869"); static BigInteger R = new BigInteger("72294619754760174015019300613282868" + "7219874058383991405961870844510501809885568825032608592198728334" + "7842806755320938980653857292210955880919036195738252708294945320" + "3969657021169134916999794791553544054426668823852291733234236693" + "4178738081619274342922698767296233937873073756955509269717272907" + "8566607940937442517"); static BigInteger A = new BigInteger("32189274574111378750865973746687106" + "3695160924347574569923113893643975328118502246784387874381928804" + "6865920942258286938666201264395694101012858796521485171319748255" + "4630425677084511454641229993833255506759834486100188932905136959" + "7287419551379203001848457730376230681693887924162381650252270090" + "28296990388507680954"); public static void main(String[] args) { FewChars(); System.out.println(); ManyChars(); } public static void FewChars() { //ElGamalEncipher(String plaintext, BigInteger p, BigInteger g, BigInteger r) BigInteger[] cipherText = ElGamal.ElGamalEncipher("This is a string " + "of 129 characters which works just fine . This is a string " + "of 129 characters which works just fine . This is a s", P, G, R); System.out.println("This is a string of 129 characters which works " + "just fine . This is a string of 129 characters which works " + "just fine . This is a s"); //ElGamalDecipher(BigInteger c, BigInteger d, BigInteger a, BigInteger p) System.out.println("The decrypted text is: " + ElGamal.ElGamalDecipher(cipherText[0], cipherText[1], A, P)); } public static void ManyChars() { //ElGamalEncipher(String plaintext, BigInteger p, BigInteger g, BigInteger r) BigInteger[] cipherText = ElGamal.ElGamalEncipher("This is a string " + "of 130 characters which doesn’t work! This is a string of " + "130 characters which doesn’t work! This is a string of ", P, G, R); System.out.println("This is a string of 130 characters which doesn’t " + "work! This is a string of 130 characters which doesn’t work!" + " This is a string of "); //ElGamalDecipher(BigInteger c, BigInteger d, BigInteger a, BigInteger p) System.out.println("The decrypted text is: " + ElGamal.ElGamalDecipher(cipherText[0], cipherText[1], A, P)); } } import java.math.BigInteger; import java.security.SecureRandom; public class ElGamal { public static BigInteger[] ElGamalEncipher(String plaintext, BigInteger p, BigInteger g, BigInteger r) { // returns a BigInteger[] cipherText // cipherText[0] is c // cipherText[1] is d SecureRandom sr = new SecureRandom(); BigInteger[] cipherText = new BigInteger[2]; BigInteger pText = new BigInteger(plaintext.getBytes()); // 1: select a random integer k such that 1 <= k <= p-2 BigInteger k = new BigInteger(p.bitLength() - 2, sr); // 2: Compute c = g^k(mod p) BigInteger c = g.modPow(k, p); // 3: Compute d= P*r^k = P(g^a)^k(mod p) BigInteger d = pText.multiply(r.modPow(k, p)).mod(p); // C =(c,d) is the ciphertext cipherText[0] = c; cipherText[1] = d; return cipherText; } public static String ElGamalDecipher(BigInteger c, BigInteger d, BigInteger a, BigInteger p) { //returns the plaintext enciphered as (c,d) // 1: use the private key a to compute the least non-negative residue // of an inverse of (c^a)' (mod p) BigInteger z = c.modPow(a, p).modInverse(p); BigInteger P = z.multiply(d).mod(p); byte[] plainTextArray = P.toByteArray(); return new String(plainTextArray); } }

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  • DoubleBuffering in Java

    - by DDP
    Hello there, I'm having some trouble implementing DoubleBuffer into my program. Before you faint from the wall of text, you should know that a lot of it is there just in case you need to know. The actual place where I think I'm having problems is in one method. I've recently looked up a tutorial on the gpwiki about double buffering, and decided to try and implement the code they had into the code I have that I'm trying to implement doublebuffer in. I get the following error: "java.lang.IllegalStateException: Component must have a valid peer". I don't know if it makes any difference if you know it or not, but the following is the code with the main method. This is just a Frame that displays the ChronosDisplay class inside it. I omitted irrelevant code with "..." public class CDM extends JFrame { public CDM(String str) { super("CD:M - "+str); try { ... ChronosDisplay theGame = new ChronosDisplay(str); ((Component)theGame).setFocusable(true); add(theGame); } catch(Exception e) { System.out.println("CDM ERROR: " +e); } } public static void main( String args[] ) { CDM run = new CDM("DP_Mini"); } } Here is the code where I think the problem resides (I think the problem is in the paint() method). This class is displayed in the CDM class public class ChronosDisplay extends Canvas implements Runnable { String mapName; public ChronosDisplay (String str) { mapName = str; new Thread(this).start(); setVisible(true); createBufferStrategy(2); } public void paint( Graphics window ) { BufferStrategy b = getBufferStrategy(); Graphics g = null; window.setColor(Color.white); try { g = b.getDrawGraphics(); paintMap(g); paintUnits(g); paintBullets(g); } finally { g.dispose(); } b.show(); Toolkit.getDefaultToolkit().sync(); } public void paintMap( Graphics window ) { TowerMap m = new TowerMap(); try { m = new TowerMap(mapName); for(int x=0; x<m.getRows()*50; x+=50) { for(int y = 0; y<m.getCols()*50; y+=50) { int tileType = m.getLocation(x/50,y/50); Image img; if(tileType == 0) { Tile0 t = new Tile0(x,y); t.draw(window); } ...// More similar if statements for other integers } catch(Exception e) ... } ...// Additional methods not shown here public void run() { try { while(true) { Thread.currentThread().sleep(20); repaint(); } } catch(Exception e) ... } } If you're curious (I doubt it matters), the draw() method in the Tile0 class is: public void draw( Graphics window ) { window.drawImage(img,getX(),getY(),50,50,null); } Any pointers, tips, or solutions are greatly appreciated. Thanks for your time! :D

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  • Why do I get a NullReferenceException when using a style on a ContentPresenter?

    - by Robert Rossney
    I've created this template, which uses a style applied to the ContentPresenter so that I can bind the data object's Column property to Grid.Column, allowing the items to determine for themselves which column of the Grid they go into: <DataTemplate DataType="{x:Type local:MyObject}"> <ItemsControl ItemsSource="{Binding Items}"> <ItemsControl.Resources> <Style TargetType="{x:Type ContentPresenter}"> <Setter Property="Grid.Column" Value="{Binding Column}" /> </Style> </ItemsControl.Resources> <ItemsControl.ItemsPanel> <ItemsPanelTemplate> <Grid> <Grid.ColumnDefinitions> <ColumnDefinition Width="*" /> <ColumnDefinition Width="*" /> <ColumnDefinition Width="*" /> </Grid.ColumnDefinitions> </Grid> </ItemsPanelTemplate> </ItemsControl.ItemsPanel> </ItemsControl> </DataTemplate> When I run the program, I get a NullReferenceException. The beginning of the hilariously long stack trace: at System.Windows.StyleHelper.ApplyAutoAliasRules(OptimizedTemplateContent optimizedTemplateContent, HybridDictionary childIndexFromChildID, FrameworkTemplate frameworkTemplate, FrugalStructList`1& childRecordFromChildIndex, FrugalStructList`1& triggerSourceRecordFromChildIndex, FrugalStructList`1& resourceDependents, HybridDictionary& dataTriggerRecordFromBinding, Boolean& hasInstanceValues) at System.Windows.StyleHelper.ProcessTemplateContent(FrameworkTemplate frameworkTemplate, FrugalStructList`1& childRecordFromChildIndex, FrugalStructList`1& triggerSourceRecordFromChildIndex, FrugalStructList`1& resourceDependents, ItemStructList`1& eventDependents, HybridDictionary& dataTriggerRecordFromBinding, HybridDictionary childIndexFromChildID, Boolean& hasInstanceValues) at System.Windows.StyleHelper.SealTemplate(FrameworkTemplate frameworkTemplate, Boolean& isSealed, FrameworkElementFactory templateRoot, TriggerCollection triggers, ResourceDictionary resources, HybridDictionary childIndexFromChildID, FrugalStructList`1& childRecordFromChildIndex, FrugalStructList`1& triggerSourceRecordFromChildIndex, FrugalStructList`1& containerDependents, FrugalStructList`1& resourceDependents, ItemStructList`1& eventDependents, HybridDictionary& triggerActions, HybridDictionary& dataTriggerRecordFromBinding, Boolean& hasInstanceValues, EventHandlersStore& eventHandlersStore) at System.Windows.FrameworkTemplate.Seal() at System.Windows.StyleHelper.UpdateTemplateCache(FrameworkElement fe, FrameworkTemplate oldTemplate, FrameworkTemplate newTemplate, DependencyProperty templateProperty) at System.Windows.Controls.ContentPresenter.OnTemplateChanged(DependencyObject d, DependencyPropertyChangedEventArgs e) at System.Windows.DependencyObject.OnPropertyChanged(DependencyPropertyChangedEventArgs e) at System.Windows.FrameworkElement.OnPropertyChanged(DependencyPropertyChangedEventArgs e) at System.Windows.DependencyObject.NotifyPropertyChange(DependencyPropertyChangedEventArgs args) ...etc. It's not the binding. I still get the error if I explicitly set the value in the style's setter to 0, say. And the error vanishes if I remove the style, though then all of the items end up in column 0. What's going on here? And how do I debug a problem like this?

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