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  • Exception Class: When to Derive from it, In C# (.Net)?

    - by IbrarMumtaz
    I am continuing with my exam revision. I have come across the usage of the Base Exception class and I have seen it on exam papers also. My question is when do you derive from the Base Exception class? I am of the impression if you want a custom class to throw an exception with more meaningful information, then you can create a custom exception class that contains the exact data that is representative of how your custom class is used and what scenario it is designed to be used for? Why can't my custom exception class derive from 'ApplicationException' or 'SecurityException' or the base 'Exception' class? I am of the impression that I should derive from the base Exception class and not the previous two. My question second is, when would you derive from the other two??? Are there any clear-cut distinctions as to when you would derive from either one of these three? Assuming there are no others I have I have missed out? Thanks, Ibrar

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  • Popup extender "frozen" on code-behind exception.

    - by davandries
    Hi, In a C#/ASP.NET project, we're using an ajax modalpopupextender to display a "Processing..." message to the users. We're displaying it using a Javascript call in the code of the ASP.NET page. Then, in the code behind, we're doing some database operation, and hide again the popup using "popup.hide();" The problem is that when an exception occurs in the code behind, the popup is still displayed and the application does not handle errors as per the "customErrors" tag of the web.config. Any idea on how to deal with this kind of issues? Thanks, David

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  • How do I implement a fibonacci sequence in java using try/catch logic?

    - by Lars Flyger
    I know how to do it using simple recursion, but in order to complete this particular assignment I need to be able to accumulate on the stack and throw an exception that holds the answer in it. So far I have: public static int fibo(int index) { int sum = 0; try { fibo_aux(index, 1, 1); } catch (IntegerException me) { sum = me.getIntValue(); } return sum; } fibo_aux is supposed to throw an IntegerException (which holds the value of the answer that is retireved via getIntValue) and accumulates the answer on the stack, but so far I can't figure it out. Can anyone help?

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  • Exception Error in c#

    - by Kumu
    using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Text; using System.Windows.Forms; using System.IO; using System.Runtime.Serialization.Formatters.Binary; namespace FoolballLeague { public partial class MainMenu : Form { FootballLeagueDatabase footballLeagueDatabase; Game game; Login login; public MainMenu() { InitializeComponent(); changePanel(1); } public MainMenu(FootballLeagueDatabase footballLeagueDatabaseIn) { InitializeComponent(); footballLeagueDatabase = footballLeagueDatabaseIn; } private void Form_Loaded(object sender, EventArgs e) { } private void gameButton_Click(object sender, EventArgs e) { int option = 0; changePanel(option); } private void scoreboardButton_Click(object sender, EventArgs e) { int option = 1; changePanel(option); } private void changePanel(int optionIn) { gamePanel.Hide(); scoreboardPanel.Hide(); string title = "Football League System"; switch (optionIn) { case 0: gamePanel.Show(); this.Text = title + " - Game Menu"; break; case 1: scoreboardPanel.Show(); this.Text = title + " - Display Menu"; break; } } private void logoutButton_Click(object sender, EventArgs e) { login = new Login(); login.Show(); this.Hide(); } private void addGameButton_Click(object sender, EventArgs e) { if ((homeTeamTxt.Text.Length) == 0) MessageBox.Show("You must enter a Home Team"); else if (homeScoreUpDown.Value > 9 || homeScoreUpDown.Minimum < 0) MessageBox.Show("You must enter one digit between 0 and 9"); else if ((awayTeamTxt.Text.Length) == 0) MessageBox.Show("You must enter a Away Team"); else if (homeScoreUpDown.Value > 9 || homeScoreUpDown.Value < 0) MessageBox.Show("You must enter one digit between 0 to 9"); else { //checkGameInputFields(); game = new Game(homeTeamTxt.Text, int.Parse(homeScoreUpDown.Value.ToString()), awayTeamTxt.Text, int.Parse(awayScoreUpDown.Value.ToString())); MessageBox.Show("Home Team -" + '\t' + homeTeamTxt.Text + '\t' + "and" + '\r' + "Away Team -" + '\t' + awayTeamTxt.Text + '\t' + "created"); footballLeagueDatabase.AddGame(game); //clearCreateStudentInputFields(); } } private void timer1_Tick(object sender, EventArgs e) { displayDateAndTime(); } private void displayDateAndTime() { dateLabel.Text = DateTime.Today.ToLongDateString(); timeLabel.Text = DateTime.Now.ToShortTimeString(); } private void displayResultsButton_Click(object sender, EventArgs e) { Game game = new Game(homeTeamTxt.Text, int.Parse(homeScoreUpDown.Value.ToString()), awayTeamTxt.Text, int.Parse(awayScoreUpDown.Value.ToString())); gameResultsListView.Items.Clear(); gameResultsListView.View = View.Details; ListViewItem row = new ListViewItem(); row.SubItems.Add(game.HomeTeam.ToString()); row.SubItems.Add(game.HomeScore.ToString()); row.SubItems.Add(game.AwayTeam.ToString()); row.SubItems.Add(game.AwayScore.ToString()); gameResultsListView.Items.Add(row); } private void displayGamesButton_Click(object sender, EventArgs e) { Game game = new Game("Home", 2, "Away", 4);//homeTeamTxt.Text, int.Parse(homeScoreUpDown.Value.ToString()), awayTeamTxt.Text, int.Parse(awayScoreUpDown.Value.ToString())); modifyGamesListView.Items.Clear(); modifyGamesListView.View = View.Details; ListViewItem row = new ListViewItem(); row.SubItems.Add(game.HomeTeam.ToString()); row.SubItems.Add(game.HomeScore.ToString()); row.SubItems.Add(game.AwayTeam.ToString()); row.SubItems.Add(game.AwayScore.ToString()); modifyGamesListView.Items.Add(row); } } } This is the whole code and I got same error like previous question. Unhandled Exception has occurred in you application.If you click...............click Quit.the application will close immediately. Object reference not set to an instance of an object. And the following details are in the error message. ***** Exception Text ******* System.NullReferenceException: Object reference not set to an instance of an object. at FoolballLeague.MainMenu.addGameButton_Click(Object sender, EventArgs e) in C:\Users\achini\Desktop\FootballLeague\FootballLeague\MainMenu.cs:line 91 at System.Windows.Forms.Control.OnClick(EventArgs e) at System.Windows.Forms.Button.OnMouseUp(MouseEventArgs mevent) at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks) at System.Windows.Forms.Control.WndProc(Message& m) at System.Windows.Forms.ButtonBase.WndProc(Message& m) at System.Windows.Forms.Button.WndProc(Message& m) at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m) at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam) I need to add the games to using the addGameButton and the save those added games and display them in the list view (gameResultsListView). Now I can add a game and display in the list view.But when I pressed the button addGameButton I got the above error message. If you can please give me a solution to this problem.

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  • SQLite Delphi thowing up incorrect exception.

    - by NeoNMD
    "Project CompetitionServer.exe raised exception class ESQLiteException with message 'Error executing SQL. Error [1]: SQL error or missing database. "INSERT INTO MatchesTable(MatchesID,RoundID,AkaFirstName,AoFirstName)VALUES(1,2,p,o)": no such column: p'. Process stopped. Use Step or Run to continue." This is clear to everone here that the notice is correct, p is NOT a column, it is some data I am trying to insert. What is the problem here?

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  • What option in Visual Studio let catching exception where it occurred?

    - by macias
    VS 2010. The same WPF project, debug mode, two computers: A -- when exception occurrs the caret is placed at the point of exception B -- when the exception occurrs, correct exception is placed but always caret is placed at "win.ShowDialog()" in App.xaml.cs -- this is main entry for showing & running my application, in such case it is very tiresome to track down where the exception occurred What kind of settings control such behaviour? Of course I would like to switch B, so when exception hits I would be place at the point of exception, not at the main entry.

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  • How can I make Ruby rake display the full backtrace on uncaught exception

    - by Martinos
    As you may know rake swallows the full backtrace on uncaught exception. If I want to have a full backtrace, I need to add the --trace option. I find this very annoying because some of my tasks take long time to run (up to 6 hours), when it crashes I don't have any debugging info. I need to run it again with the --trace. On top of that, the system may not be in the same state as when the error occurred, so it may not show afterward. I always have to add --trace on any tasks. This displasy stuff that I don't want to see when the task is executed. Is there a way to change this default behaviour? (which I don't think is useful at all)

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  • Email notifications of exceptions happening in a Python app?

    - by ming yeow
    Hi folks, I want to set up email notifications when there is an error happening in my application. In ruby, there is a very elegant solution called ExceptionNotifier, which wraps around the exception handler and uses the built-in mailer to send an email. What is the best way of doing this in Python? I know that this is a very common issue, so would love for any tips that you folks can share! PS: Code samples, pointers to modules would be AWESOME! Thanks!

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  • C#: When should I use TryParse?

    - by zxcvbnm
    I understand it doesn't throw an Exception and because of that it might be sightly faster, but also, you're most likely using it to convert input to data you can use, so I don't think it's used so often to make that much of difference in terms of performance. Anyway, the examples I saw are all along the lines of an if/else block with TryParse, the else returning an error message. And to me, that's basically the same thing as using a try/catch block with the catch returning an error message. So, am I missing something? Is there a situation when this is actually useful?

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  • ASP.NET - Exception logging approach for concurrent user scenario

    - by Whiskey-Tango-Foxtrot
    I am involved in designing a asp.net webforms application using .NET 3.5. I have a requirement where we need to log exceptions. What is the best approach for exception handling, given that there would be concurrent users for this application? Is there a need or possibility to log in exceptions at a user level? My support team in-charge wants to have a feature where the support team can get user specific log files. To give you a background, this application is currently on VB 6.0 and we are migrating it along with some enhancements. So, today the support personnel have a provision to get user specific log files.

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  • php: simplexml exception retry

    - by exceptionhandlingnoob
    I am querying an API using SimpleXML which will occasionally fail for reasons unknown. I would like to have the script retry up to 5 times. How can I do this? I assume it has something to do with wrapping the object in a try/catch, but I'm not very experienced with this -- have tried to read the manual on exception handling but am still at a loss. Thanks for any help :) // set up xml handler $xmlstr = file_get_contents($request); $xml = new SimpleXMLElement($xmlstr); Here is the error message I am receiving: [function.file-get-contents]: failed to open stream: HTTP request failed!

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  • server.sh gives me following error Exception"main" java.lang.NoClassDefFoundError:

    - by NickNaik
    i am trying to start the "Program D" from the terminal, command in terminal "sh server.sh" gives me following error Starting Alicebot Program D. Exception in thread "main" java.lang.NoClassDefFoundError: org/alicebot/server/net/AliceServer Caused by: java.lang.ClassNotFoundException: org.alicebot.server.net.AliceServer at java.net.URLClassLoader$1.run(URLClassLoader.java:202) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:190) at java.lang.ClassLoader.loadClass(ClassLoader.java:306) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301) at java.lang.ClassLoader.loadClass(ClassLoader.java:247) My Server.sh file ALICE_HOME=.SERVLET_LIB=lib/servlet.jar ALICE_LIB=lib/aliceserver.jar JS_LIB=lib/js.jar # Set SQL_LIB to the location of your database driver. SQL_LIB=lib/mysql_comp.jar # These are for Jetty; you will want to change these if you are using a different http server. HTTP_SERVER_LIBS=lib/org.mortbay.jetty.jar:lib/javax.xml.jaxp.jar:lib/org.apache.crimson.jar PROGRAMD_CLASSPATH=$SERVLET_LIB:$ALICE_LIB:$JS_LIB:$SQL_LIB:$HTTP_SERVER_LIBS java -classpath $PROGRAMD_CLASSPATH -Xms64m -Xmx64m org.alicebot.server.net.AliceServer $1

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  • Global Exception Handlers in Java

    - by Samuh
    I am thinking of setting up a global, default Exception handler for my (Android) Mobile application(which uses Java syntax) using Thread.setDefaultUncaughtExceptionHandler(...) call. I am thinking of just displaying an Alert Dialog with appropriate message to the user. Are there any gotchas, caveats and rules that one needs to follow when setting DefaultExceptionHandlers? Any best practices like making sure that the process is killed, full stack trace is written to logs etc. ? Links to documentation, tutorials etc. that can throw some light on this are welcome. Thanks.

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  • Basic Python: Exception raising and local variable scope / binding

    - by SuperJdynamite
    I have a basic "best practices" Python question. I see that there are already StackOverflow answers tangentially related to this question but they're mired in complicated examples or involve multiple factors. Given this code: #!/usr/bin/python def test_function(): try: a = str(5) raise b = str(6) except: print b test_function() what is the best way to avoid the inevitable "UnboundLocalError: local variable 'b' referenced before assignment" that I'm going to get in the exception handler? Does python have an elegant way to handle this? If not, what about an inelegant way? In a complicated function I'd prefer to avoid testing the existence of every local variable before I, for example, printed debug information about them.

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  • strenge exception phenomenon in win7

    - by Level 2
    Hello all, I spot some interesting artcles about exception handle in codeproject http://www.codeproject.com/KB/cpp/seexception.aspx after reading, I decided to do some experiment. The first time I try to excute the following code char *p; p[0] = 0; The program died without question. But After serveral time I execute the same problem binary code. It magically did fine. even the following code is doing well. any clue or explain? char *p p[1000] = 'd'; cout<<p[1000]<<endl; my os is windows 7 64bit and compiler is vs2008 rc1.

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  • Strange exception phenomenon in Windows 7

    - by Level 2
    I spot some interesting articles about exception handle in CodeProject http://www.codeproject.com/KB/cpp/seexception.aspx After reading, I decided to do some experiment. The first time I try to execute the following code char *p; p[0] = 0; The program died without question. But After several times when I executed the same problem binary code, it magically did fine. Even the following code is doing well. Any clue or explanation? char *p p[1000] = 'd'; cout<<p[1000]<<endl; My O/S is Windows 7 64bit and compiler is VS2008 rc1.

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  • null reference exception was unhandled by user code

    - by user238319
    sir, i develop the following code in vs2005, now i just using this module in my new project @ vs 2008.. But this error was araised. I cant able to fix this problem... Private Sub DataAccess() Dim errHandle As New ErrorHandler Dim lobjCommon As New eCopsCommonFunctions Try AccessCodeDrplst.DataSource = CType(lobjCommon.gfuncGetAllEnrollmentSource(), DataSet) AccessCodeDrplst.DataValueField = "DataAccessCode" AccessCodeDrplst.DataTextField = "DataAccessDesc" AccessCodeDrplst.DataBind() 'lstEnrollmentSourceCode.DataValueField = "EnrollmentSourceCode" 'lstEnrollmentSourceCode.DataTextField = "EnrollmentSourceDesc" 'lstEnrollmentSourceCode.DataBind() '"Beneficiary Election" is pre selected as default value. By pals on Oct 24th 2007 'lstEnrollmentSourceCode.SelectedValue = "B" 'lstEnrollmentSourceCode.Items.Insert(0, New ListItem("Select", "0")) Catch ex As Exception errHandle.gProcHandleErrors(ex, Session("MemberID"), "SPStatus.aspx.vb, gprocFillSEPCode") Throw ex Finally lobjCommon = Nothing ///here the error occurs as 'NullException was unhandle by the user code' errHandle = Nothing End Try End Sub

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  • Java exception translations

    - by user3079275
    Apologies if this has been discussed on other threads but I find it helps clarify my thinking when I am forced to write down my questions. I am trying to properly understand the concept of checked vs unchecked exceptions and exception translation in Java but I am getting confused. So far I understood that checked exceptions are exceptions that need to be always caught in a try/catch block otherwise I get a compile time error. This is to force programmers to think about abnormal situations that might happen at run time (like disk full etc). Is this right? What I did not get was why we have unchecked exceptions, when are they useful? Is it only during development time to debug code that might access an illegal array index etc? This confusion is because I see that Error exceptions are also unchecked as is RunTimeException but its not clear to me why they are both lumped together into an unchecked category?

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  • Android Uncaught Exception

    - by Agrim Asthana
    09-30 02:32:31.474: D/ddm-heap(214): Got feature list request 09-30 02:32:31.634: D/AndroidRuntime(214): Shutting down VM 09-30 02:32:31.634: W/dalvikvm(214): threadid=3: thread exiting with uncaught exception (group=0x4001b188) 09-30 02:32:31.634: E/AndroidRuntime(214): Uncaught handler: thread main exiting due to uncaught exception 09-30 02:32:31.654: E/AndroidRuntime(214): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.mjcet.mjcet/com.mjcet.mjcet.MJCET}: java.lang.ClassNotFoundException: com.mjcet.mjcet.MJCET in loader dalvik.system.PathClassLoader@44e8c820 09-30 02:32:31.654: E/AndroidRuntime(214): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2417) 09-30 02:32:31.654: E/AndroidRuntime(214): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2512) 09-30 02:32:31.654: E/AndroidRuntime(214): at android.app.ActivityThread.access$2200(ActivityThread.java:119) 09-30 02:32:31.654: E/AndroidRuntime(214): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1863) 09-30 02:32:31.654: E/AndroidRuntime(214): at android.os.Handler.dispatchMessage(Handler.java:99) 09-30 02:32:31.654: E/AndroidRuntime(214): at android.os.Looper.loop(Looper.java:123) 09-30 02:32:31.654: E/AndroidRuntime(214): at android.app.ActivityThread.main(ActivityThread.java:4363) 09-30 02:32:31.654: E/AndroidRuntime(214): at java.lang.reflect.Method.invokeNative(Native Method) 09-30 02:32:31.654: E/AndroidRuntime(214): at java.lang.reflect.Method.invoke(Method.java:521) 09-30 02:32:31.654: E/AndroidRuntime(214): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860) 09-30 02:32:31.654: E/AndroidRuntime(214): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618) 09-30 02:32:31.654: E/AndroidRuntime(214): at dalvik.system.NativeStart.main(Native Method) 09-30 02:32:31.654: E/AndroidRuntime(214): Caused by: java.lang.ClassNotFoundException: com.mjcet.mjcet.MJCET in loader dalvik.system.PathClassLoader@44e8c820 09-30 02:32:31.654: E/AndroidRuntime(214): at dalvik.system.PathClassLoader.findClass(PathClassLoader.java:243) 09-30 02:32:31.654: E/AndroidRuntime(214): at java.lang.ClassLoader.loadClass(ClassLoader.java:573) 09-30 02:32:31.654: E/AndroidRuntime(214): at java.lang.ClassLoader.loadClass(ClassLoader.java:532) 09-30 02:32:31.654: E/AndroidRuntime(214): at android.app.Instrumentation.newActivity(Instrumentation.java:1021) 09-30 02:32:31.654: E/AndroidRuntime(214): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2409) 09-30 02:32:31.654: E/AndroidRuntime(214): ... 11 more 09-30 02:32:31.684: I/dalvikvm(214): threadid=7: reacting to signal 3 09-30 02:32:31.684: E/dalvikvm(214): Unable to open stack trace file '/data/anr/traces.txt': Permission denied the above is my debugging output for the below activities LOGINACTIVITY.java package com.agrim.mjcet; import com.agrim.mjcet.R; import android.app.Activity; import android.content.Intent; import android.os.Bundle; import android.view.View; //import android.widget.TextView; import android.widget.Button; import android.widget.EditText; import android.view.View.OnClickListener; public class LoginActivity extends Activity { EditText txtUserName; EditText txtPassword; Button btnLogin; Button btnCancel; public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); // setting default screen to login.xml setContentView(R.layout.main); txtUserName=(EditText)this.findViewById(R.id.txtUname); txtPassword=(EditText)this.findViewById(R.id.txtPwd); btnLogin=(Button)this.findViewById(R.id.btnLogin); btnLogin=(Button)this.findViewById(R.id.btnLogin); btnLogin.setOnClickListener(new OnClickListener() { public void onClick(View v) { // Switching to Register screen if((txtUserName.getText().toString()).equals(txtPassword.getText().toString())) { Intent myIntent = new Intent(getApplicationContext(),SampleActivity.class); startActivityForResult(myIntent, 0); } } } ); } } SAMPLE ACTIVITY.java package com.agrim.mjcet; import com.agrim.mjcet.R; import android.app.Activity; import android.os.Bundle; import android.view.View; import android.widget.TextView; public class SampleActivity extends Activity { @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); // Set View to register.xml setContentView(R.layout.lol); TextView HomeScreen = (TextView) findViewById(R.id.back); HomeScreen.setOnClickListener(new View.OnClickListener() { public void onClick(View arg0) { // Closing registration screen // Switching to Login Screen/closing register screen finish(); } }); } } and here are my 2 layouts MAIN.XML <TableLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:background="#000000" android:stretchColumns="1"> <TableRow> <TextView android:text="@string/user_name" android:textColor="#347235" android:id="@+id/TextView01" android:layout_width="wrap_content" android:layout_marginLeft="25dip" android:layout_height="wrap_content"> </TextView> <EditText android:text="" android:inputType="text" android:id="@+id/txtUname" android:layout_weight="0.75" android:layout_width="wrap_content" android:layout_marginRight="10dip" android:layout_marginBottom="5dip" android:background="#FFFFFF" android:layout_height="wrap_content"> </EditText> </TableRow> <TableRow> <TextView android:text="@string/password" android:textColor="#347235" android:id="@+id/TextView02" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginLeft="25dip"> </TextView> <EditText android:text="" android:inputType="textPassword" android:id="@+id/txtPwd" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginRight="10dip" android:layout_weight="1" android:background="#FFFFFF" android:gravity="center"> </EditText> </TableRow> <TableRow> <Button android:id="@+id/btnLogin" android:layout_width="fill_parent" android:layout_height="wrap_content" android:background="#FFFFFF" android:layout_marginTop="25dip" android:layout_marginLeft="50dip" android:onClick="onClickMyButton" android:text="@string/login" /> <Button android:id="@+id/btnCancel" android:layout_width="fill_parent" android:layout_height="wrap_content" android:background="#FFFFFF" android:layout_marginTop="25dip" android:layout_marginLeft="100dip" android:layout_marginRight="50dip" android:text="@string/cancel" /> </TableRow> <FrameLayout android:layout_width="wrap_content" android:layout_height="match_parent" > <ImageView android:layout_width="fill_parent" android:layout_height="match_parent" android:scaleType="centerInside" android:src="@drawable/logo_invert" android:contentDescription="@drawable/logo_invert"/> </FrameLayout> </TableLayout> and finally LOL.xml <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:background="#000000" android:layout_height="fill_parent" > <ImageView android:layout_width="fill_parent" android:id="@+id/back" android:layout_height="match_parent" android:scaleType="centerInside" android:src="@drawable/lol" android:contentDescription="@drawable/lol"> </ImageView> <RelativeLayout android:layout_width="match_parent" android:layout_height="138dp" android:orientation="vertical" android:gravity="bottom" > <TextView android:id="@+id/TextView02" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentBottom="true" android:layout_centerHorizontal="true" android:text="@string/coming_soon" android:textColor="#347235" /> </RelativeLayout> </FrameLayout> I get a force close upon initialization.. and yes this is my first android app :)

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  • getting Null pointer exception

    - by Abhijeet
    Hi I am getting this message on emulator when I run my android project: The application MediaPlayerDemo_Video.java (process com.android.MediaPlayerDemo_Video) has stopped unexpectedly. Please try again I am trying to run the MediaPlayerDemo_Video.java given in ApiDemos in the Samples given on developer.android.com. The code is : package com.android.MediaPlayerDemo_Video; import android.app.Activity; import android.media.AudioManager; import android.media.MediaPlayer; import android.media.MediaPlayer.OnBufferingUpdateListener; import android.media.MediaPlayer.OnCompletionListener; import android.media.MediaPlayer.OnPreparedListener; import android.media.MediaPlayer.OnVideoSizeChangedListener; import android.os.Bundle; import android.util.Log; import android.view.SurfaceHolder; import android.view.SurfaceView; import android.widget.Toast; public class MediaPlayerDemo_Video extends Activity implements OnBufferingUpdateListener, OnCompletionListener, OnPreparedListener, OnVideoSizeChangedListener, SurfaceHolder.Callback { private static final String TAG = "MediaPlayerDemo"; private int mVideoWidth; private int mVideoHeight; private MediaPlayer mMediaPlayer; private SurfaceView mPreview; private SurfaceHolder holder; private String path; private Bundle extras; private static final String MEDIA = "media"; // private static final int LOCAL_AUDIO = 1; // private static final int STREAM_AUDIO = 2; // private static final int RESOURCES_AUDIO = 3; private static final int LOCAL_VIDEO = 4; private static final int STREAM_VIDEO = 5; private boolean mIsVideoSizeKnown = false; private boolean mIsVideoReadyToBePlayed = false; /** * * Called when the activity is first created. */ @Override public void onCreate(Bundle icicle) { super.onCreate(icicle); setContentView(R.layout.mediaplayer_2); mPreview = (SurfaceView) findViewById(R.id.surface); holder = mPreview.getHolder(); holder.addCallback(this); holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS); extras = getIntent().getExtras(); } private void playVideo(Integer Media) { doCleanUp(); try { switch (Media) { case LOCAL_VIDEO: // Set the path variable to a local media file path. path = ""; if (path == "") { // Tell the user to provide a media file URL. Toast .makeText( MediaPlayerDemo_Video.this, "Please edit MediaPlayerDemo_Video Activity, " + "and set the path variable to your media file path." + " Your media file must be stored on sdcard.", Toast.LENGTH_LONG).show(); } break; case STREAM_VIDEO: /* * Set path variable to progressive streamable mp4 or * 3gpp format URL. Http protocol should be used. * Mediaplayer can only play "progressive streamable * contents" which basically means: 1. the movie atom has to * precede all the media data atoms. 2. The clip has to be * reasonably interleaved. * */ path = ""; if (path == "") { // Tell the user to provide a media file URL. Toast .makeText( MediaPlayerDemo_Video.this, "Please edit MediaPlayerDemo_Video Activity," + " and set the path variable to your media file URL.", Toast.LENGTH_LONG).show(); } break; } // Create a new media player and set the listeners mMediaPlayer = new MediaPlayer(); mMediaPlayer.setDataSource(path); mMediaPlayer.setDisplay(holder); mMediaPlayer.prepare(); mMediaPlayer.setOnBufferingUpdateListener(this); mMediaPlayer.setOnCompletionListener(this); mMediaPlayer.setOnPreparedListener(this); mMediaPlayer.setOnVideoSizeChangedListener(this); mMediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC); } catch (Exception e) { Log.e(TAG, "error: " + e.getMessage(), e); } } public void onBufferingUpdate(MediaPlayer arg0, int percent) { Log.d(TAG, "onBufferingUpdate percent:" + percent); } public void onCompletion(MediaPlayer arg0) { Log.d(TAG, "onCompletion called"); } public void onVideoSizeChanged(MediaPlayer mp, int width, int height) { Log.v(TAG, "onVideoSizeChanged called"); if (width == 0 || height == 0) { Log.e(TAG, "invalid video width(" + width + ") or height(" + height + ")"); return; } mIsVideoSizeKnown = true; mVideoWidth = width; mVideoHeight = height; if (mIsVideoReadyToBePlayed && mIsVideoSizeKnown) { startVideoPlayback(); } } public void onPrepared(MediaPlayer mediaplayer) { Log.d(TAG, "onPrepared called"); mIsVideoReadyToBePlayed = true; if (mIsVideoReadyToBePlayed && mIsVideoSizeKnown) { startVideoPlayback(); } } public void surfaceChanged(SurfaceHolder surfaceholder, int i, int j, int k) { Log.d(TAG, "surfaceChanged called"); } public void surfaceDestroyed(SurfaceHolder surfaceholder) { Log.d(TAG, "surfaceDestroyed called"); } public void surfaceCreated(SurfaceHolder holder) { Log.d(TAG, "surfaceCreated called"); playVideo(extras.getInt(MEDIA)); } @Override protected void onPause() { super.onPause(); releaseMediaPlayer(); doCleanUp(); } @Override protected void onDestroy() { super.onDestroy(); releaseMediaPlayer(); doCleanUp(); } private void releaseMediaPlayer() { if (mMediaPlayer != null) { mMediaPlayer.release(); mMediaPlayer = null; } } private void doCleanUp() { mVideoWidth = 0; mVideoHeight = 0; mIsVideoReadyToBePlayed = false; mIsVideoSizeKnown = false; } private void startVideoPlayback() { Log.v(TAG, "startVideoPlayback"); holder.setFixedSize(mVideoWidth, mVideoHeight); mMediaPlayer.start(); } } I think the above message is due to Null pointer exception , however I may be false. I am unable to find where the error is . So , Please someone help me out .

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  • Windows Azure : Storage Client Exception Unhandled

    - by veda
    I am writing a code for upload large files into the blobs using blocks... When I tested it, it gave me an StorageClientException It stated: One of the request inputs is out of range. I got this exception in this line of the code: blob.PutBlock(block, ms, null); Here is my code: protected void ButUploadBlocks_click(object sender, EventArgs e) { // store upladed file as a blob storage if (uplFileUpload.HasFile) { name = uplFileUpload.FileName; byte[] byteArray = uplFileUpload.FileBytes; Int64 contentLength = byteArray.Length; int numBytesPerBlock = 250 *1024; // 250KB per block int blocksCount = (int)Math.Ceiling((double)contentLength / numBytesPerBlock); // number of blocks MemoryStream ms ; List<string>BlockIds = new List<string>(); string block; int offset = 0; // get refernce to the cloud blob container CloudBlobContainer blobContainer = cloudBlobClient.GetContainerReference("documents"); // set the name for the uploading files string UploadDocName = name; // get the blob reference and set the metadata properties CloudBlockBlob blob = blobContainer.GetBlockBlobReference(UploadDocName); blob.Properties.ContentType = uplFileUpload.PostedFile.ContentType; for (int i = 0; i < blocksCount; i++, offset = offset + numBytesPerBlock) { block = Convert.ToBase64String(BitConverter.GetBytes(i)); ms = new MemoryStream(); ms.Write(byteArray, offset, numBytesPerBlock); blob.PutBlock(block, ms, null); BlockIds.Add(block); } blob.PutBlockList(BlockIds); blob.Metadata["FILETYPE"] = "text"; } } Can anyone tell me how to solve it...

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  • Delphi Exception Handling - How to clean up properly?

    - by Tom
    I'm looking at some code in an application of ours and came across something a little odd from what I normally do. With exception handling and cleanup, we (as well as many other programmers out there, I'm sure) use a Try/Finally block embedded with a Try/Except block. Now I'm used to the Try/Except inside the Try/Finally like so: Try Try CouldCauseError(X); Except HandleError; end; Finally FreeAndNil(x); end; but this other block of code is reversed as so: Try Try CouldCauseError(X); Finally FreeAndNil(x); end; Except HandleError; end; Looking around the web, I'm seeing folks doing this both ways, with no explanation as to why. My question is, does it matter which gets the outside block and which gets the inside block? Or will the except and finally sections get handled no matter which way it is structured? Thanks.

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  • how to rethrow same exception in sql server

    - by Shantanu Gupta
    I want to rethrow same exception in sql server that has been occured in my try block. I am able to throw same message but i want to throw same error. BEGIN TRANSACTION BEGIN TRY INSERT INTO Tags.tblDomain (DomainName, SubDomainId, DomainCode, Description) VALUES(@DomainName, @SubDomainId, @DomainCode, @Description) COMMIT TRANSACTION END TRY BEGIN CATCH declare @severity int; declare @state int; select @severity=error_severity(), @state=error_state(); RAISERROR(@@Error,@ErrorSeverity,@state); ROLLBACK TRANSACTION END CATCH RAISERROR(@@Error, @ErrorSeverity, @state); This line will show error, but i want functionality something like that. This raises error with error number 50000, but i want erron number to be thrown that i am passing @@error, I want to capture this error no at frontend i.e. catch (SqlException ex) { if ex.number==2627 MessageBox.show("Duplicate value cannot be inserted"); } I want this functionality. which can't be achieved using raiseerror. I dont want to give custom error message at back end.

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  • I am getting a Radix out of range exception on performing decryption

    - by user3672391
    I am generating a keypair and converting one of the same into string which later is inserted into the database using the following code: KeyPairGenerator keyGen = KeyPairGenerator.getInstance("RSA"); keyGen.initialize(2048); KeyPair generatedKeyPair = keyGen.genKeyPair(); PublicKey pubkey = generatedKeyPair.getPublic(); PrivateKey prvkey = generatedKeyPair.getPrivate(); System.out.println("My Public Key>>>>>>>>>>>"+pubkey); System.out.println("My Private Key>>>>>>>>>>>"+prvkey); String keyAsString = new BigInteger(prvkey.getEncoded()).toString(64); I then retrieve the string from the database and convert it back to the original key using the following code (where rst is my ResultSet): String keyAsString = rst.getString("privateKey").toString(); byte[] bytes = new BigInteger(keyAsString, 64).toByteArray(); //byte k[] = "HignDlPs".getBytes(); PKCS8EncodedKeySpec encodedKeySpec = new PKCS8EncodedKeySpec(bytes); KeyFactory rsaKeyFac = KeyFactory.getInstance("RSA"); PrivateKey privKey = rsaKeyFac.generatePrivate(encodedKeySpec); On using the privKey for RSA decryption, I get the following exception java.lang.NumberFormatException: Radix out of range at java.math.BigInteger.<init>(BigInteger.java:294) at com.util.SimpleFTPClient.downloadFile(SimpleFTPClient.java:176) at com.Action.FileDownload.processRequest(FileDownload.java:64) at com.Action.FileDownload.doGet(FileDownload.java:94) Please guide.

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  • Java Runtime Exception

    - by ikurtz
    when i run my application i get the following error: Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException at javax.swing.text.FlowView$FlowStrategy.layoutRow(FlowView.java:546) at javax.swing.text.FlowView$FlowStrategy.layout(FlowView.java:460) at javax.swing.text.FlowView.layout(FlowView.java:184) at javax.swing.text.BoxView.setSize(BoxView.java:380) at javax.swing.text.BoxView.updateChildSizes(BoxView.java:349) at javax.swing.text.BoxView.setSpanOnAxis(BoxView.java:331) at javax.swing.text.BoxView.layout(BoxView.java:691) at javax.swing.text.BoxView.setSize(BoxView.java:380) at javax.swing.plaf.basic.BasicTextUI$RootView.setSize(BasicTextUI.java:1702) at javax.swing.plaf.basic.BasicTextUI.modelToView(BasicTextUI.java:1034) at javax.swing.text.DefaultCaret.repaintNewCaret(DefaultCaret.java:1291) at javax.swing.text.DefaultCaret$1.run(DefaultCaret.java:1270) at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209) at java.awt.EventQueue.dispatchEvent(EventQueue.java:597) at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269) at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184) at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161) at java.awt.EventDispatchThread.run(EventDispatchThread.java:122) as the error does not mention any of my classes, how would i go about in finding what is causing this? if i try: public void notifyChatMessage(String message){...} the error goes away. but if i try: public void notifyChatMessage(Object message){...} the error is reported. please advise.

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