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  • How to sort an NSMutableArray of objects by a member of its class, that is an int or float

    - by J. Dave
    I have a class (from NSObject) that contains: NSString name int position float speed I then create an array (NSMutableArray) of objects from this class. I would like to then sort the array by the 'speed' value, which is a float. I initially has the float value as an NSNumber and the int as NSInteger, and I was successfully sorting with: [myMutableArray sortUsingFunction:compareSelector context:@selector(position)]; where myMutableArray is my array of objects. here is the function: static int compareSelector(id p1, id p2, void *context) { SEL methodSelector = (SEL)context; id value1 = [p1 performSelector:methodSelector]; id value2 = [p2 performSelector:methodSelector]; return [value1 compare:value2]; } Now that I am using int instead of NSInteger, the above code does not work. Is there a more low-level command that I should be using to execute the sort? Thank!

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  • why am i getting a null pointer when converting string to int array?

    - by Sackling
    My main method: public static void main(String[] args) { Scanner input = new Scanner(System.in); String string1; string1 = input.next(); LargeInteger firstInt = new LargeInteger(string1); System.out.printf("First integer: %s \n", firstInt.display()); } LargeInteger class: public class LargeInteger { private int[] intArray; //convert the strings to array public LargeInteger(String s) { for (int i = 0; i < s.length(); i++) { intArray[i] = Character.digit(s.charAt(i), 10); // in base 10 } } //display the strings public String display() { String result = ""; for (int i = 0; i < intArray.length; i++) { result += intArray[i]; } return result.toString(); } }

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  • Weird parsing date string error in Android 2.0 emulator

    - by kknight
    I have a simple test code for testing SimpleDateFormat. This code works well on Eclipse and Android 1.5 emulator, but it failed at Android 2.0 emulator. Does anyone know why? Thanks. public class TemplateActivity extends Activity { /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); TextView tv = new TextView(this); tv.setText(R.string.hello); setContentView(tv); SimpleDateFormat format = new SimpleDateFormat("EEE, dd MMM yyyy HH:mm:ss zzz"); String dateStr = "Mon, 17 May 2010 01:45:41 GMT"; try { Date parsed = format.parse(dateStr); Log.v("Test", parsed.toString()); } catch (ParseException pe) { Log.v("Test", "ERROR: Cannot parse \"" + dateStr + "\""); } } } Log message: V/Test( 400): ERROR: Cannot parse "Mon, 17 May 2010 01:45:41 GMT"

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  • ASP.NET web services leak memory when (de)serializing disposable objects?

    - by Serilla
    In the following two cases, if Customer is disposable (implementing IDisposable), I believe it will not be disposed by ASP.NET, potentially being the cause of a memory leak: [WebMethod] public Customer FetchCustomer(int id) { return new Customer(id); } [WebMethod] public void SaveCustomer(Customer value) { // save it } This flaw applies to any IDisposable object. So returning a DataSet from a ASP.NET web service, for example, will also result in a memory leak - the DataSet will not be disposed. In my case, Customer opened a database connection which was cleaned up in Dispose - except Dispose was never called resulting in loads of unclosed database connections. I realise there a whole bunch of bad practices being followed here (its only an example anyway), but the point is that ASP.NET - the (de)serializer - is responsible for disposing these objects, so why doesn't it? This is an issue I was aware of for a while, but never got to the bottom of. I'm hoping somebody can confirm what I have found, and perhaps explain if there is a way of dealing with it.

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  • findNode in binary search tree

    - by Weadadada Awda
    Does this look right? I mean I am trying to implement the delete function. Node* BST::findNode(int tofind) { Node* node = new Node; node = root; while (node != NULL) { if (node->val == tofind) { return node; } else if (tofind < node->val) { node = node->left; } else { node = node->right; } } } Here is the delete, it's not even close to done but, void BST::Delete(int todelete) { // bool found = false; Node* toDelete = new Node(); toDelete=findNode(todelete); if(toDelete->val!=NULL) { cout << toDelete->val << endl; } } This causes a segmentation fault just running that, any ideas?

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  • How to pause the timer in c#?

    - by Jay
    I have a timer in my code and the interval is 10s When the timer elapsed, I will do some checking, and it may takes more than 10s for checking and some update jobs. However, if I didn't stop the timer, seems the checking will execute every 10s ... If I call the stop(), seems the timer cannot be start again ... ie something like: protected void timer_elapsed(object sender, EventArgs args) { __timer.Stop(); //Some checking here more than 10s __timer.Start(); } I just want another 10s to check again after the before checking is done. anyone can help?

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  • StreamTokenizer Iterator Adapter help

    - by alpdog14
    I have this StreamTokenizer Iterator Adapter that is suppose to create a Tokenizer Iterator Index Builder then build the index from a STIA wrapped around a StreamTokenizer. I am having trouble implementing the hasNext and Next for my STIA, can anyone help me, here is my class: public class StreamTokenizerIteratorAdapter implements Iterator<Token> { DefaultIndexImpl index; StreamTokenizer source; public StreamTokenizerIteratorAdapter(final StreamTokenizer source) { if (source == null) throw new IllegalArgumentException("source == null"); } @Override public boolean hasNext() { return !index.isEmpty(); } public Token next() { if(!index.isEmpty()) return next(); else return null; } @Override public void remove() { throw new UnsupportedOperationException(); } } Should I be using the source element in the hasNext() and next()?

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  • Is my program taking too much time to execute?

    - by Conrad C
    I wanted to solve a question from project euleur about finding the largest prime number of a big number. I run my code on a virtual machine on Visual studio 2012, and the code seems froze. When I step into the loop, the code works well, but when I execute it, the console is always there. It is as if the program is still running. Could it be that the program takes time to execute? My Code static void Main(string[] args) { long number = 5; for (long i = 1; i < 600851475143; i++) { if (i % 2 != 0 && i % 1 == 0 && i % i == 0) number = i; } }

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  • how to get TabHeader on trigger

    - by CurlyFro
    i have a tabcontrol. i'm trying to pass the tabcontrol as a parameter to figure out the selected tab item so i can get the tab header name. Binding this doesn't seem to work. ideas? <TabControl Background="#FFF9F9F9" Height="650"> <i:Interaction.Triggers> <i:EventTrigger EventName="SelectionChanged"> <n:ExecuteCommandAction Command="{Binding UpdateTabCommand}" Parameter="{Binding this}"/> </i:EventTrigger> </i:Interaction.Triggers> in my viewmodel constructor i have: _updateTabCommand = new ActionCommand< TabControl>(UpdateTab); private method: public void UpdateTab(TabControl tabControl) { var tabItem = (TabItem)tabControl.SelectedItem;

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  • iPhone How to set a clearcolor for my custom view

    - by user355066
    Hi, I am creating a custom StyleLabel by extending the UIView, which provides a link for particular type of strings. I have successfully implemented this functionality. I am using this label in TableViewCell along with UILabel.i set UILabel & StyleLabel background color is set to clearColor. UILabel works fine, but StyleLabel shows background in blackColor. I am not sure what is the problem with the following code. Here is the drawRect method of CustomLabel class -(void) drawRect:(CGRect)rect { CGContextRef ctx = UIGraphicsGetCurrentContext(); CGContextClearRect(ctx, rect); [[UIColor clearColor] setFill]; CGContextAddRect(ctx, rect); CGContextDrawPath(ctx, kCGPathFill); [_text drawText:ctx]; } Thanks Sasikumar

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  • Should I make my MutexLock volatile?

    - by sje397
    I have some code in a function that goes something like this: void foo() { { // scope the locker MutexLocker locker(&mutex); // do some stuff.. } bar(); } The function call bar() also locks the mutex. I am having an issue whereby the program crashes (for someone else, who has not as yet provided a stack trace or more details) unless the mutex lock inside bar is disabled. Is it possible that some optimization is messing around with the way I have scoped the locker instance, and if so, would making it volatile fix it? Is that a bad idea? Thanks.

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  • Default Values Specflow Step Definitions

    - by Gavin Osborn
    I'm starting out in the world of SpecFlow and I have come across my first problem. In terms of keeping my code DRY I'd like to do the following: Have two scenarios: Given I am on a product page And myfield equals todays date Then... Given I am on a product page And myfield equals todays date plus 4 days Then... I was hoping to use the following Step Definition to cover both variants of my And clause: [Given(@"myfield equals todays date(?: (plus|minus) (\d+) days)?")] public void MyfieldEqualsTodaysDate(string direction, int? days) { //do stuff } However I keep getting exceptions when SpecFlow tries to parse the int? param. I've checked the regular expression and it definitely parses the scenario as expected. I'm aware that I could so something as crude as method overloading etc, I was just wondering if SpecFlow supported the idea of default parameter values, or indeed another way to achieve the same effect. Many Thanks

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  • Botan::SecureVector - Destructor called in Constructor???

    - by sheepsimulator
    When using the Botan::SecureVector in the following unit test: void UnitTest() { std::vector<byte> vbData; vbData.push_back(0x04); vbData.push_back(0x04); vbData.push_back(0x04); Botan::SecureVector<Botan::byte> svData(&vbData[0], vbData.size()); CPPUNIT_ASSERT(vbData == std::vector<byte>(svData.begin(), svData.end())); } a segmentation fault occurs when trying to allocate the SecureVector.

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  • Weird Animation when inserting a row in UITableView

    - by svveet
    I have tableview which holds a list of data, when users press "Edit" i add an extra row at the bottom saying "add new" - (void)setEditing:(BOOL)editing animated:(BOOL)animated { [super setEditing:editing animated:animated]; NSArray *paths = [NSArray arrayWithObject: [NSIndexPath indexPathForRow:1 inSection:0]]; if (editing) { [[self tableView] insertRowsAtIndexPaths:paths withRowAnimation:UITableViewRowAnimationTop]; } else { [[self tableView] deleteRowsAtIndexPaths:paths withRowAnimation:UITableViewRowAnimationTop]; } } and of course the UITableView transform with animation, but weird thing is the row before the row that i just added, has different animation than all others. all rows perform "slides in" animation, but that 2nd last one did a "fade in" animation. and i didnt set any animation on the 2nd last row (or any other row), and if i didnt add the new row in, the animation slides in as normal when i switch to editing mode. somehow i cant find an answer, i check with contact app on my phone, it didnt have that weird animation as i have, when they adding a new row on editing mode. Any help would be appreciated. Thanks

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  • Re-ordering a collection of UIView's based on their CGPoint

    - by Chris
    Hi all, I have a NSMutableArray that holds a collection of UIViewControllers Amongst other properties and methods an instance of each of the viewControllers are placed in a parent view The user will place these objects individually when desired to. So essentially I use - (void)addSubview:(UIView *)view when a new view is added to the parent view controller. Because the UI is isometric it's made things a tad more complicated What I am trying to do is re-order the views based on their co-ordinate position, so items higher up the parent UIView frame is indexed lower then views lower in the parent UIview frame. And items that are on the left side of the view are positioned at a higher index to those on the right I think the solution may have to do with re-ordering the NSMutableArray but how can I compare the CGpoints? Do I need to compare the x and y separately?

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  • help implementing algorithm

    - by davit-datuashvili
    http://en.wikipedia.org/wiki/All_nearest_smaller_values this is site of the problem and here is my code but i have some trouble to implement it import java.util.*; public class stack{ public static void main(String[]args){ int x[]=new int[]{ 0, 8, 4, 12, 2, 10, 6, 14, 1, 9, 5, 13, 3, 11, 7, 15 }; Stack<Integer> st=new Stack<Integer>(); for (int a:x){ while (!st.empty() && st.pop()>=a){ System.out.println( st.pop()); if (st.empty()){ break; } else{ st.push(a); } } } } } and here is pseudo code from site S = new empty stack data structure for x in the input sequence: while S is nonempty and the top element of S is greater than or equal to x: pop S if S is empty: x has no preceding smaller value else: the nearest smaller value to x is the top element of S push x onto S

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  • How to check whether a excel file is write protected or not in C#?

    - by Pavan Navali
    Hi, I'm developing a sample application in which I have to open an excel file and check whether the file is write protercteed or not. The code is using System.Windows.Forms; using Microsoft.Office.Core; private void button1_Click(object sender, EventArgs e) { string fileNameAndPath = @"D:\Sample\Sample1.xls"; // the above excel file is a write protected. Microsoft.Office.Interop.Excel.Application a = new Microsoft.Office.Interop.Excel.Application(); if (System.IO.File.Exists(fileNameAndPath)) { Microsoft.Office.Interop.Excel.ApplicationClass app = new Microsoft.Office.Interop.Excel.ApplicationClass(); // create the workbook object by opening the excel file. app.Workbooks.Open(fileNameAndPath,0,false,5,"","",true,Microsoft.Office.Interop.Excel.XlPlatform.xlWindows,"\t",false, true, 0,false,true,0); Microsoft.Office.Interop.Excel._Workbook w = app.Workbooks.Application.ActiveWorkbook; if (w.ReadOnly) MessageBox.Show("HI"); // the above condition is true. } } I would like know whether the file is write protected or not.

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  • Java Program Compiles and Runs, but doesn't work

    - by Richard Long
    When I run this program I enter information in a text box, push the search button, but nothing happens. The program just sits there until I press Cntrl C to break it. It looks like it should work, but I can't figure out what is hanging the program up. Here is the code: First class: import java.io.*; import java.awt.*; import javax.swing.*; import java.awt.event.*; import java.util.*; public class NameGameFrame extends JFrame { public static String name; static JTextField textfield = new JTextField(20); static JTextArea textarea = new JTextArea(30,30); public static String num; public static String [] fields; public static int [] yearRank; public static boolean match; public static int getInts, marker, year, max; public static void main( String[] args) { JFrame frame = new JFrame(); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setTitle("Name Game"); frame.setLocation(500,400); frame.setSize(800,800); JPanel panel = new JPanel(new GridBagLayout()); GridBagConstraints c = new GridBagConstraints(); JLabel label = new JLabel("Enter the Name or Partial Name to search:"); c.gridx = 0; c.gridy = 0; c.insets = new Insets(2,2,2,2); panel.add(label,c); c.gridx = 0; c.gridy = 1; panel.add(textarea,c); JButton button = new JButton("Search"); c.gridx = 1; c.gridy = 1; panel.add(button,c); c.gridx = 1; c.gridy = 0; panel.add(textfield,c); frame.getContentPane().add(panel, BorderLayout.NORTH); frame.pack(); frame.setVisible(true); button.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent ae) { name = textfield.getText(); java.io.File file = new java.io.File("namesdata.txt"); try { Scanner input = new Scanner(file); num = input.nextLine(); NameRecord nr = new NameRecord(name); while (input.hasNext()) { if(match = num.toLowerCase().contains(name.toLowerCase())) { nr.getRank(); nr.getBestYear(marker); } } } catch(FileNotFoundException e) { System.err.format("File does not exist\n"); } textarea.setText(fields[0]); } }); } } This is the second class: import java.io.*; import java.util.*; public class NameRecord { public NameRecord( String name) { } public static int getBestYear(int marker) { switch (marker) { case 1: year = 1900; break; case 2: year = 1910; break; case 3: year = 1920; break; case 4: year = 1930; break; case 5: year = 1940; break; case 6: year = 1950; break; case 7: year = 1960; break; case 8: year = 1970; break; case 9: year = 1980; break; case 10: year = 1990; break; case 11: year = 2000; break; } return year; } public static int getRank() { fields = num.split(" "); max = 0; for (int i = 1; i<12; i++) { getInts = Integer.parseInt(fields[i]); if(getInts>max) { max = getInts; marker = i; } } return max; } }

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  • how to retrive String from DatagramPacket

    - by sajith
    the following code prints [B@40545a60,[B@40545a60abc exp but i want to print abc,so that i can retrive the correct message from the receiving system public class Operation { InetAddress ip; DatagramSocket dsock; DatagramPacket pack1; byte[] bin,bout; WifyOperation(InetAddress Systemip) { ip=Systemip; try { dsock=new DatagramSocket(); } catch (SocketException e) { // TODO Auto-generated catch block e.printStackTrace(); } } void sendbyte() { String senddata="abc"+"123"; bout=senddata.getBytes(); pack1=new DatagramPacket(bout,bout.length,ip,3322); try { dsock.send(pack1); Log.d(pack1.getData().toString(),"abc exp"); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } } how i retrieve string instead of byte from the packet pack1

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  • Constructor/Destructor involving a class and a struct

    - by Bogdan Maier
    I am working on a program and need to make an array of objects, specifically I have a 31x1 array where each position is an object, (each object is basically built out of 6 ints). Here is what I have but something is wrong and i could use some help thank you. 31x1 struct header" const int days=31; struct Arr{ int days; int *M; }; typedef Arr* Array; 31x1 matrix constructor: void constr(){ int *M; M = new Expe[31]; // Expe is the class class header: class Expe { private: //0-HouseKeeping, 1-Food, 2-Transport, 3-Clothing, 4-TelNet, 5-others int *obj; } Class object constructor: Expe::Expe() { this->obj=new int[6]; } help please... because i`m pretty lost.

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  • UIAcceleration filtering

    - by Ilya
    Hi, I found the following piece of code in apple guidelines: - (void)accelerometer:(UIAccelerometer*)accelerometer didAccelerate:(UIAcceleration*)acceleration { //Use a basic low-pass filter to only keep the gravity in the accelerometer values accel[0] = acceleration.x * kFilteringFactor + accel[0] * (1.0 - kFilteringFactor); accel[1] = acceleration.y * kFilteringFactor + accel[1] * (1.0 - kFilteringFactor); accel[2] = acceleration.z * kFilteringFactor + accel[2] * (1.0 - kFilteringFactor); } What does it exactly do? What is this low-pass filter? Why do I have to apply it? Thank you in advance.

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  • How we should load theMFMailComposeViewController in cocos2d ?

    - by srikanth rongali
    I am writing an app in using cocos2d. This method I have written for the selector goToFirstScreen: . The view is in landscape mode. I need to send an email. So, I need to launch the MFMailComposeViewController. I need it in portrait mode. But, the control is not entering in to viewDidLoad of the mailMe class. The problem is in goToScreen: method. But, I do not get where I am wrong ? -(void)goToFirstScreen:(id)sender { CCScene *Scene = [CCScene node]; CCLayer *Layer = [mailME node]; [Scene addChild:Layer]; [[CCDirector sharedDirector] setAnimationInterval:1.0/60]; [[CCDirector sharedDirector] pushScene: Scene]; } Thank you .

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  • RS-232 confusion under C++

    - by rock
    What's the problem in given code? Why it is not showing the output for rs232 when we connect it by the d-9 connector with the short of pin number 2 & 3 in that? #include <bios.h> #include <conio.h> #define COM1 0 #define DATA_READY 0x100 #define SETTINGS ( 0x80 | 0x02 | 0x00 | 0x00) int main(void) { int in, out, status; bioscom(0, SETTINGS, COM1); /*initialize the port*/ cprintf("Data sent to you: "); while (1) { status = bioscom(3, 0, COM1); /*wait until get a data*/ if (status & DATA_READY) if ((out = bioscom(2, 0, COM1) & 0x7F) != 0) /*input a data*/ putch(out); if (kbhit()) { if ((in = getch()) == 27) /* ASCII of Esc*/ break; bioscom(1, in, COM1); /*output a data*/ } } return 0; }

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  • Hibernate / MySQL Bulk insert problem

    - by Marty Pitt
    I'm having trouble getting Hibernate to perform a bulk insert on MySQL. I'm using Hibernate 3.3 and MySQL 5.1 At a high level, this is what's happening: @Transactional public Set<Long> doUpdate(Project project, IRepository externalSource) { List<IEntity> entities = externalSource.loadEntites(); buildEntities(entities, project); persistEntities(project); } public void persistEntities(Project project) { projectDAO.update(project); } This results in n log entries (1 for every row) as follows: Hibernate: insert into ProjectEntity (name, parent_id, path, project_id, state, type) values (?, ?, ?, ?, ?, ?) I'd like to see this get batched, so the update is more performant. It's possible that this routine could result in tens-of-thousands of rows generated, and a db trip per row is a killer. Why isn't this getting batched? (It's my understanding that batch inserts are supposed to be default where appropriate by hibernate).

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  • I'm new to Java most basic question about arrays!

    - by ambidextorous
    Hey I have not been able to find a proper answer on any forums about this but how exactly do I pass an array to a class? public class TestArray { String name; String[] array; public TestArray(String name, String[] anArray){ this.name = name; int len = anArray.length; this.array = new String[len]; for (int i = 0; i < len; i++){ this.array[i] = new String(anArray[i]); } } } public static void main(String[] args){ String[] anArray = new String[2]; anArray[0] = new String("Test"); anArray[1] = new String("Test2"); TestArray work = new TestArray("Jordan", anArray?); } }

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