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  • abstract class need acces to subclass atribute

    - by user1742980
    I have a problem with my code. public abstract class SimplePolygon implements Polygon { ... public String toString(){ String str = "Polygon: vertices ="; for(int i = 0;i<varray.length;i++){ str += " "; str += varray[i]; } return str; } } public class ArrayPolygon extends SimplePolygon { private Vertex2D[] varray; public ArrayPolygon(Vertex2D[] array){ varray = new Vertex2D[array.length]; if (array == null){} for(int i = 0;i<array.length;i++){ if (array[i] == null){} varray[i] = array[i]; } ... } Problem is, that i'm not allowed to add any atribute or method to abstract class SimplePolygon, so i'cant properly initialize varray. It could simply be solved with protected atrib in that class, but for some (stupid) reason i'cant do that. Has anybody an idea how to solve it without that? Thanks for all help.

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  • Have a doubt on uritemplates in WCF Services

    - by Debby
    I have a webservice with following operation contract and my service is hosted at //localhost:9002/Service.svc/ (I did not put http: before the localhost, as new user can post only one hyperlink) [OperationContract] [WebGet ( UriTemplate = "/Files/{Filepath}" ) ] Stream DownloadFile(string Filepath); This webservice would let users download file, if the proper filepath is provided (assuming, i somehow findout proper filepath). Now, I can access this service from a browser by typing, //localhost:9002/Service.svc/Files/(Filepath} If {filepath} is some simple string, its not a problem, but i want to send the location of the file. Lets us say users want to download file "C:\Test.mp3" on the server. But how can I pass "C:\Test.mp3" as {Filepath}. I get an error when i type http://localhost:9002/Service.svc/Files/C:\Test.mp3 in the browser. I am new to webservices and find that quickest way to clear doubts is in this community.

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  • Is there a best coding style for indentations (same line, next line)?

    - by Luis Soeiro
    I prefer Pascal-like coding style, where the beginning and ending of a code block are on the same column. I think that it is easier to read and to handle cut and paste than the other kind of coding style. The style I prefer (Pascal-like): void fooBar(String s) { int a; int length=s.length(); for (int i=0;i<length;i++) { if (i>10) { System.out.println(i); System.out.println(s.charAt(i)); } } } The style that was adopted by the Java community: void fooBar(String s) { int a; int length=s.length(); for (int i=0;i<length;i++){ if (i>10){ System.out.println(i); System.out.println(s.charAt(i)); } } } So why do you use one type or the other (please cite an objective reason)?

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  • Task.wait not working as I imagined

    - by user2357446
    I am trying to download a file, wait for the file to finish downloading, and then read the file afterwards. I have the following methods to do this: private async Task startDownload(string link, string savePath) { WebClient client = new WebClient(); client.DownloadProgressChanged += new DownloadProgressChangedEventHandler(client_DownloadProgressChanged); client.DownloadFileCompleted += new AsyncCompletedEventHandler(client_DownloadFileCompleted); await client.DownloadFileTaskAsync(new Uri(link), savePath); } private void checkUpdateButton_Click(object sender, EventArgs e) { Task task = Task.Factory.StartNew(() => startDownload(versionLink, versionSaveTo)); task.Wait(); if (task.IsCompleted) { checkVersion(); } } The checkVersion() method reads the file that was downloaded. This is throwing an IOException saying that the file is in use by something else and cannot be read. I thought that having task.Wait would prevent the rest of the method from executing until the task was finished?

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  • Memory leak till crash due to HttpRequest

    - by Alex R.
    I played with HttpRequest and realized that the memory is not cleaned up after any request. After some time the running tab within Chrome will crash. Here is some testing code. Put a large sized file into the 'www' directory and set the URL in the code accordingly. import 'dart:async'; import 'dart:html'; void main() { const PATH = "http://127.0.0.1:3030/PATH_TO_FILE"; new Timer.periodic(new Duration(seconds:10), (Timer it)=>getString(PATH)); } void getString( String url){ HttpRequest.getString(url).then((String data){ }); } Is this really a bug or did I something wrong?

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  • Circular reference problem Singleton

    - by Ismail
    I'm trying to creating a Singleton class like below where MyRepository lies in separate DAL project. It's causing me a circular reference problem because GetMySingleTon() method returns MySingleTon class and needs its access. Same way I need MyRepository access in constructor of MySingleTon class. public class MySingleTon { static MySingleTon() { if (Instance == null) { MyRepository rep = new MyRepository(); Instance = rep.GetMySingleTon(); } } public static MySingleTon Instance { get; private set; } public string prop1 { get; set; } public string prop2 { get; set; } }

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  • Implementing Object Oriented: ansi-C approach

    - by No Money
    Hey there, I am an Intermediate programmer in Java and know some of the basics in C++. I recently started to scam over "C language" [please note that i emphasized on C language and want to stick with C as i found it to be a perfect tool, so no need for suggestions focusing on why should i move back to C++ or Java or any other crappy language (e.g: C#)]. Moving on, I code an Object Oriented approach in C but kindda scramble with the pointers part. Please understand that I am just a noob trying to extend my knowledge beyond what i learned in High School. Here is my code..... #include <stdio.h> typedef struct per{ int privateint; char *privateString; struct per (*New) (); void (*deleteperOBJ) (struct t_person *); void (*setperNumber) ((struct*) t_person,int); void (*setperString) ((struct*) t_person,char *); void (*dumpperState) ((struct*) t_person); }t_person; void setperNumber(t_person *const per,int num){ if(per==NULL) return; per->privateint=num; } void setperString(t_person *const per,char *string){ if(per==NULL) return; per->privateString=string; } void dumpperState(t_person *const per){ if(per==NULL) return; printf("value of private int==%d\n", per->privateint); printf("value of private string==%s\n", per->privateString); } void deleteperOBJ(struct t_person *const per){ free((void*)t_person->per); t_person ->per = NULL; } main(){ t_person *const per = (struct*) malloc(sizeof(t_person)); per = t_person -> struct per -> New(); per -> setperNumber (t_person *per, 123); per -> setperString(t_person *per, "No money"); dumpperState(t_person *per); deleteperOBJ(t_person *per); } Just to warn you, this program has several errors and since I am a beginner I couldn't help except to post this thread as a question. I am looking forward for assistance. Thanks in advance.

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  • Pass parameters to a user control - asp.net

    - by Cristian Boariu
    Hi, I have this user control: <user:RatingStars runat="server" product="<%= getProductId() %>" category="<%= getCategoryId() %>"></user:RatingStars> You see that i fill the product and category by calling two methods: public string getProductId() { return productId.ToString(); } public string getCategoryId() { return categoryId.ToString(); } I do not understand why, in the user control, when i take the data received (product and category) it gives me "<%= getProductId() %" instead of giving the id received from that method... Any help would be kindly appreciated...

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  • Cast Object to JTable?

    - by Chris
    I am trying to implement a ListSelectionListener for some of my JTables. Simply (at the moment) the ListSelectionListener is supposed to simply return the text of the cell that was selected. My program design has several JTables and I would like to have one ListSelectionListener work for them all. In the valueChanged event of the ListSelectionListener I thought it was possible to do something like: private class SelectionHandler implements ListSelectionListener { public void valueChanged(ListSelectionEvent e) { JTable table = (JTable)e.getSource(); String data = (String) table.getValueAt(table.getSelectedRow(), 0); // Print data } } But when I do this I a ClassCastException error. Is there a way to do something like this? One solution I thought of was to compare the source of the event (e.getSource()) to all my JTables to see if they were equivalent (big if block) and then just calling .getValueAt inside that block but that would making the code in the future difficult if tables were to be added or removed.

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  • Removing final bash script argument

    - by ctuffli
    I'm trying to write a script that searches a directory for files and greps for a pattern. Something similar to the below except the find expression is much more complicated (excludes particular directories and files). #!/bin/bash if [ -d "${!#}" ] then path=${!#} else path="." fi find $path -print0 | xargs -0 grep "$@" Obviously, the above doesn't work because "$@" still contains the path. I've tried variants of building up an argument list by iterating over all the arguments to exclude path such as args=${@%$path} find $path -print0 | xargs -0 grep "$path" or whitespace="[[:space:]]" args="" for i in "${@%$path}" do # handle the NULL case if [ ! "$i" ] then continue # quote any arguments containing white-space elif [[ $i =~ $whitespace ]] then args="$args \"$i\"" else args="$args $i" fi done find $path -print0 | xargs -0 grep --color "$args" but these fail with quoted input. For example, # ./find.sh -i "some quoted string" grep: quoted: No such file or directory grep: string: No such file or directory Note that if $@ doesn't contain the path, the first script does do what I want.

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  • Handle property change event listeners (lots of them) more elegantly (dictionary?)

    - by no9
    hELLO ! Here i have a simple class example with three fields of type class B and some other stuff. As you can see im listening on every child object change. Since i could need alot of properties of type class B i wonder if there is a way of shrinking the code. Creating a listener + a method for each seems like i will have ALOT of code. How would i fix this ... using a dictionary or something similar? I have been told that IoC could fix this, but im not sure where to start. public class A : INotifyPropertyChanged { public event PropertyChangedEventHandler PropertyChanged; public int _id; public int Id { get { return _id; } set { if (_id == value) { return; } _id = value; OnPropertyChanged("Id"); } } public string _name; public string Name { get { return _name; } set { if (_name == value) { return; } _name = value; OnPropertyChanged("Name"); } } public B _firstB; public B FirstB { get { return _firstB; } set { if (_firstB == value) { return; } if (_firstB != null) { FirstB.PropertyChanged -= firstObjectB_Listener; } _firstB = value; if (_firstB != null) FirstB.PropertyChanged += new PropertyChangedEventHandler(firstObjectB_Listener); OnPropertyChanged("FirstB"); } } public B _secondB; public B SecondB { get { return _secondB; } set { if (_secondB == value) { return; } if (_secondB != null) { FirstB.PropertyChanged -= secondObjectB_Listener; } _secondB = value; if (_secondB != null) SecondB.PropertyChanged += new PropertyChangedEventHandler(secondObjectB_Listener); OnPropertyChanged("FirstB"); } } public B _thirdB; public B ThirdB { get { return _thirdB; } set { if (_thirdB == value) { return; } if (_thirdB != null) { ThirdB.PropertyChanged -= thirdObjectB_Listener; } _thirdB = value; if (_thirdB != null) ThirdB.PropertyChanged += new PropertyChangedEventHandler(thirdObjectB_Listener); OnPropertyChanged("ThirdB"); } } protected void OnPropertyChanged(string name) { PropertyChangedEventHandler handler = PropertyChanged; if (handler != null) { handler(this, new PropertyChangedEventArgs(name)); } } void firstObjectB_Listener(object sender, PropertyChangedEventArgs e) { Console.WriteLine("Object A has found a change of " + e.PropertyName + " on first object B"); } void secondObjectB_Listener(object sender, PropertyChangedEventArgs e) { Console.WriteLine("Object A has found a change of " + e.PropertyName + " on second object B"); } void thirdObjectB_Listener(object sender, PropertyChangedEventArgs e) { Console.WriteLine("Object A has found a change of " + e.PropertyName + " on third object B"); } }

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  • Why my HttpPost can't receive all response data?

    - by Johnny
    I'm on Android 1.5, and my code is like this: HttpPost httpPost = new HttpPost(url); HttpEntity entity = new UrlEncodedFormEntity(params, HTTP.UTF_8); httpPost.setEntity(entity); HttpResponse response = httpClient.execute(httpPost); HttpEntity respEntity = response.getEntity(); String result = EntityUtils.toString(respEntity, DEFAULT_CHARSET); After successfully executed these codes, the result is a stripped string. I've tried using browser to test the url+param, it works fine and got all data. What's wrong with this code? Is there any parameters I need to specified?

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  • Asp.Net MVC Handle Drop Down Boxes that are not part of the Model

    - by Pino
    I have a small form which the user must fill in and consists of the following fields. Name (Text) Value (Text) Group (Group - Is a list of option pulled from a database table) Now the Model for this View looks like so, public string Name { get; set; } public string Value { get; set; } public int GroupID { get; set; } Now the view is Strongly Typed to the above model. What method would one use to populate the drop down list? Since the data is not contained within the Model (It could be contained in the Model) should we be using Temp/View data? A HTML Helper? What would be the ideal way to achieve this.

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  • Retrieving selected data from DataGrid with IEnumerable<IDictionary> (Silverlight)

    - by RemiX
    I have an application that can dynamically load data into a DataGrid. What's needed is an object of IEnumerable<IDictionary>, and a List<Dictionary<string,object>> is supplied (each Dictionary in the list has exactly the same keys). The data is loaded into the DataGrid and shown, but now I want to retrieve the data the user has clicked on. Using datagrid.SelectedItem, Silverlight complains it cannot evaluate the variable, not even when type-casted. I tried keeping the List<Dictionary<string,object>> and retrieving the right data from it using datagrid.SelectedIndex, but this index changes when the DataGrid is sorted. Does anyone know a solution to this problem?

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  • how to make condition to update table ?

    - by newBie
    hi..i want to make condition to update my table if there's already same data (in the same column) inserted in the table. im using If String.ReferenceEquals(hotel, hotel) = False Then insertDatabase() Else updateDatabase() End If this is the updateDatabase() code Dim sql2 As String = "update infoHotel set nameHotel = N" & FormatSqlParam(hotel) & _ ", knownAs1 = N" & FormatSqlParam(KnownAs(0)) & _ ", knownAs2 = N" & FormatSqlParam(KnownAs(1)) & _ ", knownAs3 = N" & FormatSqlParam(KnownAs(2)) & _ ", knownAs4 = N" & FormatSqlParam(KnownAs(3)) & _ " where hotel = " & hotel & ")" the function manage to go into updateDatabase() but has some error saying "Incorrect syntax near 'Oriental'." Oriental is the data inserted in the table. is it suitable to use ReferenceEquals? im using vb.net and sql database..tq

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  • Interface -> Entity Mapping

    - by KiD0M4N
    Hi guys, Suppose I have a few definitions like so: public interface ICategory { int ID { get; set; } string Name { get; set; } ICategory Parent { get; set; } } public class Category : ICategory { public virtual int ID { get; set; } public virtual string Name { get; set; } public virtual ICategory Parent { get; set; } } How do I map such a scenario in NHibernate? I am trying to separate the implementation of the DAL. I am learning NHibernate. Regards, Karan

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  • Which database engines support IP addresses as a native type?

    - by Matt McClellan
    I'm trying to find databases with support for IP addresses as a native type (as opposed to storing as a string, or an unsigned integer, which at least one commenter has already pointed out won't work for IPv6). The primary reason I'm looking for this is ease of development. For example, sorting on a "native" IP address column would be correct (as opposed to when it's stored as a string). I would assume support for such a type would also include useful operations such as determining if an IP address is inside a specified network for use in WHERE clauses. The only one I'm aware of so far is PostgreSQL with its inet class. Does anyone have any others?

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  • C# Sending cookie in an HttpWebRequest which is redirected

    - by Nir
    I'm looking for a way to work with an API which requires login, and then redirects to another URL. The thing is that so far I've only come up with a way to make 2 Http Requests for each action I want to do: first, get cookie with AllowRedirect=false, then get the actual URI and do a second request with the cookie: HttpWebRequest request = (HttpWebRequest)WebRequest.Create(sUrl); request.AllowAutoRedirect = false; HttpWebResponse response = (HttpWebResponse)request.GetResponse(); string redirectedUrl = response.Headers["Location"]; if (!String.IsNullOrEmpty(redirectedUrl)) { redirectedUrl = "http://www.ApiUrlComesHere.com/" + redirectedUrl; HttpWebRequest authenticatedRequest = (HttpWebRequest)WebRequest.Create(redirectedUrl); authenticatedRequest.Headers["Cookie"] = response.Headers["Set-Cookie"]; response = (HttpWebResponse)request.GetResponse(); } It seems terribly inefficient. Is there another way? Thanks!

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  • From my code, I can't trace the out of bounds exception.

    - by Matt
    public override Models.CalculationNode Parse(string expression) { var calNode = new Models.CalculationNode(); int i = expression.Length; char[] x = expression.ToCharArray(); string temp = ""; //Backwards assembly of the tree //Right Node while (!IsOperator(x[i]) && i > 0) { if (!x[i].Equals(' ')) temp = x[i] + temp; i--; } } It has been a while since I've used trees and I'm getting an out of bounds exception in the while loop.

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  • Streaming multiple TObjects to a TMemoryStream

    - by Altar
    I need to store multiple objects (most of them are TObject/non persistent) to a TMemoryStream, save the stream to disk and load it back. The objects need to be streamed one after each other. Some kind of universal container. I started to make several functions that store stuff to stream - for example function StreamReadString(CONST MemStream: TMemoryStream): string; StreamWriteString(CONST MemStream: TMemoryStream; s: string); However, it seems that I need to rewrite a lot of code. One of the many examples is TStringList.LoadFromStream that will not work so it needs to be rewritten. This is because TStringList needs to be the last object in the stream (it reads from current position to the end of the stream). Anybody knows a library that provide basic functionality like this? I am using Delphi 7 so RTTI won't help too much.

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  • Java BufferedReader behavior in CSV vs TXT file

    - by Gabriel
    If i try to read a CSV file called csv_file.csv. The problem is that when i read lines with BufferedReader.readLine() it skips the first line with months. But when i rename the file to csv_file.txt it reads it allright and it's not skipping the first line. Is there an undocumented "feature" of BufferedReader that i'm not aware? Example of file: Months, SEP2010, OCT2010, NOV2010 col1, col2, col3, col4, col5 aaa,,sdf,"12,456",bla bla bla, xsaffadfafda and so on, and so on, "10,00", xxx, xxx The code: FileInputStream stream = new FileInputStream(UploadSupport.TEMPORARY_FILES_PATH+fileName); BufferedReader br = new BufferedReader(new InputStreamReader(stream, "UTF-8")); String line = br.readLine(); String months[] = line.split(","); while ((line=br.readLine())!=null) { /*parse other lines*/ }

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  • Android Notification with AlarmManager, Broadcast and Service

    - by user2435829
    this is my code for menage a single notification: myActivity.java public class myActivity extends Activity { protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.mylayout); cal = Calendar.getInstance(); // it is set to 10.30 cal.set(Calendar.HOUR, 10); cal.set(Calendar.MINUTE, 30); cal.set(Calendar.SECOND, 0); long start = cal.getTimeInMillis(); if(cal.before(Calendar.getInstance())) { start += AlarmManager.INTERVAL_FIFTEEN_MINUTES; } Intent mainIntent = new Intent(this, myReceiver.class); pIntent = PendingIntent.getBroadcast(this, 0, mainIntent, PendingIntent.FLAG_UPDATE_CURRENT); AlarmManager myAlarm = (AlarmManager)getSystemService(ALARM_SERVICE); myAlarm.setRepeating(AlarmManager.RTC_WAKEUP, start, AlarmManager.INTERVAL_FIFTEEN_MINUTES, pIntent); } } myReceiver.java public class myReceiver extends BroadcastReceiver { @Override public void onReceive(Context c, Intent i) { Intent myService1 = new Intent(c, myAlarmService.class); c.startService(myService1); } } myAlarmService.java public class myAlarmService extends Service { @Override public IBinder onBind(Intent arg0) { return null; } @Override public void onCreate() { super.onCreate(); } @SuppressWarnings("deprecation") @Override public void onStart(Intent intent, int startId) { super.onStart(intent, startId); displayNotification(); } @Override public void onDestroy() { super.onDestroy(); } public void displayNotification() { Intent mainIntent = new Intent(this, myActivity.class); PendingIntent pIntent = PendingIntent.getActivity(this, 0, mainIntent, PendingIntent.FLAG_UPDATE_CURRENT); NotificationManager nm = (NotificationManager) this.getSystemService(Context.NOTIFICATION_SERVICE); Notification.Builder builder = new Notification.Builder(this); builder.setContentIntent(pIntent) .setAutoCancel(true) .setSmallIcon(R.drawable.ic_noti) .setTicker(getString(R.string.notifmsg)) .setContentTitle(getString(R.string.app_name)) .setContentText(getString(R.string.notifmsg)); nm.notify(0, builder.build()); } } AndroidManifest.xml <uses-permission android:name="android.permission.WAKE_LOCK" /> ... ... ... <service android:name=".myAlarmService" android:enabled="true" /> <receiver android:name=".myReceiver"/> IF the time has NOT past yet everything works perfectly. The notification appears when it must appear. BUT if the time HAS past (let's assume it is 10.31 AM) the notification fires every time... when I close and re-open the app, when I click on the notification... it has a really strange behavior. I can't figure out what's wrong in it. Can you help me please (and explain why, if you find a solution), thanks in advance :)

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