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• On-the-fly lossless image compression

  - by geschema

  I have an embedded application where an image scanner sends out a stream of 16-bit pixels that are later assembled to a grayscale image. As I need to both save this data locally and forward it to a network interface, I'd like to compress the data stream to reduce the required storage space and network bandwidth. Is there a simple algorithm that I can use to losslessly compress the pixel data? I first thought of computing the difference between two consecutive pixels and then encoding this difference with a Huffman code. Unfortunately, the pixels are unsigned 16-bit quantities so the difference can be anywhere in the range -65535 .. +65535 which leads to potentially huge codeword lengths. If a few really long codewords occur in a row, I'll run into buffer overflow problems.

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• Algorithm - Numbering for TOC (Table of Contents)

  - by belisarius

  I want to implement a VBA function to number Excel rows based upon the grouping depth of the row. But I think a general algorithm for generating TOCs is more interesting. The problem is: Given a list of "indented" lines such as One Two Three Four Five Six (the "indentation level" may be assumed to be known and part of the input data) To generate the following output: 1. One 1.1 Two 1.1.1 Three 1.1.1.1 Four 1.2 Five 2. Six Of course my code is up and running ... and also hidden under THWoS (The Heavy Weight of Shame)

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• I'm trying to build a to-do-list application in Objective C but coming up short.

  - by lampShade

  I'm getting this error: -[NSCFArray insertObject:atIndex:]: attempt to insert nil Here is the .m file: /* IBOutlet NSTextField *textField; IBOutlet NSTabView *tableView; IBOutlet NSButton *button; NSMutableArray *myArray; */ #import "AppController.h" @implementation AppController -(IBAction)addNewItem:(id)sender { myArray = [[NSMutableArray alloc]init]; tableView = [[NSTableView alloc] init]; [tableView setDataSource:self]; [textField stringValue]; NSString *string = [[NSString alloc] init]; string = [textField stringValue]; [myArray addObject:string]; NSLog(@"%d",[myArray count]); NSLog(@"%@",string); } - (int)numberOfRowsInTableView:(NSTableView *)aTableView { return [myArray count]; } - (id)tableView:(NSTableView *)aTableView objectValueForTableColumn:(NSTableColumn *)aTableColumn row:(int)rowIndex { //NSString *data = [myArray objectAtIndex:rowIndex]; return [myArray objectAtIndex:rowIndex]; } @end

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• how can retrieve a checked list of objects from ObjectListView c#?

  - by Sidaoui Mejdi

  I'm using ObjectListView with checkboxes, I would like to run a function on selected items to delete them. So i tried this Method but it not working: private List<Matricule> matrs; private void button1_Click(object sender, EventArgs e) { //List<Song> s = this.olvSongs.CheckedObjects.Count; //MessageBox.Show(this.olvSongs.CheckedItems.Count + " " + this.olvSongs.CheckedObjects.Count); string s = ""; foreach (var item in olvMatrs.SelectedItems) { matrs.Remove((Matricule)item); } this.olvSongs.SetObjects(matrs); } how can i do this task.

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• Memory leak in Qt signal and slots

  - by Ajay

  Hello, I am running valgrind on my Qt code,and even on successful exit of the application, get the following report from valgrind 8,832 bytes in 92 blocks are still reachable in loss record 12 of 12 at 0x4025390: operator new(unsigned int) (vg_replace_malloc.c:214) ==3339== by 0x4B75F05: QMutex::QMutex(QMutex::RecursionMode) (qmutex.cpp:123) ==3339== by 0x4B77602: QMutexPool::get(void const*) (qmutexpool.cpp:137) ==3339== by 0x4CA0EC2: signalSlotLock(QObject const*) (qobject.cpp:112) ==3339== by 0x4CA3939: QMetaObjectPrivate::connect(QObject const*, int, QObject const*, int, int, int*) (qobject.cpp:2900) ==3339== by 0x4CA5C00: QObject::connect(QObject const*, char const*, QObject const*, char const*, Qt::ConnectionType) (qobject.cpp:2599) I disconnect all signal connections and also delete the objects. The above mentioned leak increases if i increase the amount of signal and slot connections? Can anybody help with this?

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• ListAdapter to modify the datasource (which is an arraylist)

  - by dusker

  Hi Everyone, here's a problem that i've run into lately: I have a listview with a custom adapter class, the adapter takes in a listview and populates the listview with elements from it. Now, i'd like to have a button on each row of a listview to remove the item from it. How should i approach this problem? Is there a way to remotely trigger a method in the activity class and call notifydatachanged() method on the adapter to refresh the listview? thanks in advance for your help and some code snippets if possible best regards peter

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• Passing data with Rails' link_to helper

  - by mathee

  I am implementing a question-and-answer application with Ruby on Rails. I have MVCs for Questions and Answers. In the home view (index.haml), I list the Questions like this: - @questions.each do |q| %tr %td =link_to q.title, q Next to each of those, I want to add a link that will create a new Answer and pass the id of the Question in that row (continued from the above Haml code) : %td #{link_to 'answer me!', new_answer_path, pass q.id here somehow?} I don't know how to properly pass it and then access it in AnswersController. I tried #{link_to 'answer me!', new_answer_path, :question_id => q.id}, but that was just a guess, and I don't know how to access that in AnswersController. I read the Rails API docs, and I know you can add query, too, but I still don't know how to access the value in AnswersController.

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• PHP and ajax no update taking place

  - by sea_1987

  Hi There, I have an an ajax request that looks like this, $('input.fakecheck').click(function(){ alert("deleteing...."); $.ajax({ url:"/search", type:"POST", data: $(this).attr('name')+"="+$(this).attr('value')+"&remove=Remove", success:function() { alert(data); } }) }) This calls a php function which looks like this, private function _remove_from_short_list($cv_array) { if (is_array($cv_array)) { $short_list = $this->session->userdata('short_list'); $new_list = array_diff_key($short_list, $cv_array); $this->session->set_userdata('short_list', $new_list); } } Essentiallty what happens is that on my page I have a list which is essentially a list of id's taken out of the session, the user can then by click and input(this will change) delete the id from their session. However once the deletion has taken place I want to be able to refresh the list to show that it has taken place, currently nothing happens, until I manually refresh.

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• jQuery UI dialog + Ajax fails with IE 6-7-8

  - by user252849

  hey i have problem with jQuery-ui Dialog when using ajax $.ajax({ url: "folders.php", cache: false, data: { 'do' : 'Ajax' ,'_a' : 'ChangeMoviesFolder' ,'MovieIDS' : MovieIDS ,'toFolderID' : toFolderID ,'fromFolderID' : fromFolderID }, context: document.body, open: function(event, ui) { alert('open'); }, error : function(XMLHttpRequest, textStatus, errorThrown){ // Handle the beforeSend event // alert("responseText: "+errorThrown.message); }, success: function(data){ $('input.checkMovie').attr('checked',0); $("#resultsTable").find('tr.selectable-row').removeClass('active'); if (data == '1') { window.location = WWW_ROOT+'movies.php?do=List&FolderID='+toFolderID; } $dialog.dialog("close"); }}); when using IE ajax never get to success option in error i got "This method cannot be called until the open method has been called" Its happen only in IE. Does any one may know what the problem might be ? (all vars are ok and works perfectly in FF & chrome) thanks.

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• UIPickerView Custom Font

  - by Lee Armstrong

  I have the following code that I have found and tried to implement. I want to set the UIPickerView to have labels that I can customize the text in... When loading this it is just blank at the moment! - (UIView *)pickerView:(UIPickerView *)pickerView viewForRow:(NSInteger)row forComponent:(NSInteger)component reusingView:(UIView *)view { UILabel *pickerLabel = (UILabel *)view; NSString *text = @"TTT"; // Reuse the label if possible, otherwise create and configure a new one if ((pickerLabel == nil) || ([pickerLabel class] != [UILabel class])) { //newlabel CGRect frame = CGRectMake(0.0, 0.0, 270, 32.0); pickerLabel = [[[UILabel alloc] initWithFrame:frame] autorelease]; pickerLabel.textAlignment = UITextAlignmentLeft; pickerLabel.backgroundColor = [UIColor clearColor]; pickerLabel.font = [UIFont fontWithName:@"AmericanTypewriter" size:28]; } pickerLabel.textColor = [UIColor brownColor]; return pickerLabel; }

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• How to use DAOs with hibernate/jpa?

  - by Ari

  Assuming the DAO structure and component interaction described below, how should DAOs be used with persistence layers like hibernate and toplink? What methods should/shouldn't they contain? Would it be bad practice to move the code from the DAO directly to the service? For example, let's say that for every model we have a DAO (that may or may not implement a base interface) that looks something like the following: public class BasicDao<T> { public List<T> list() { ... } public <T> retrieve() { ... } public void save() { ... } public void delete() { ... } } Component interaction pattern is -- service DAO model

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• Best way to fetch data from a single database table with multiple threads?

  - by Ravi Bhatt

  Hi, we have a system where we collect data every second on user activity on multiple web sites. we dump that data into a database X (say MS SQL Server). we now need to fetch data from this single table from daatbase X and insert into database Y (say mySql). we want to fetch time based data from database X through multiple threads so that we fetch as fast as we can. Once fetched and stored in database Y, we will delete data from database X. Are there any best practices on this sort of design? any specific things to take care on table design like sharing or something? Are there any other things that we need to take care to make sure we fetch it as fast as we can from threads running on multiple machines? Thanks in advance! Ravi

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• how to precompile a jquery ui autocomplete widget?

  - by Alex

  Hello, I have a jquery ui autocomplete widget in a form and I'd like to preselect its value from a database. My autocomplete works in the following way: the id is a number, tha label and the value are the same and are a concatenation of id + " - " + description. When a value from the autocomplete is selected, a hidden field's value is set to the value of id. Then, the hidden field value is saved to the db when the form is submitted. When the user comes back on the page for editing, I need to reload the value from the db: I set the idden field value again and then I would like to precompile the value of the autocomplete widget with the concatenation of id + " - " + description taken form the db. I think I should trigger the event of selecting a row in the autocomplete, but I don't know how to do. Do you have any ideas? Thank you Here is the code of the autocomplete: $('#codice_contratto').autocomplete({ source: 'do_contratto.php', select: function(event, ui) { $('#id_contratto').val(ui.item.id); } });

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• Offtopic : how can I see my deleted question? Why it was deleted, but not closed?

  - by Tom

  I know it is offtopic and I will delete my question as soon as I get any answer, but somebody deleted my question. The question was opened for the whole day, but when I got 3 reopens and edited my question for asking for 2 more reopens to reopen my question, somebody deleted my question. It was about efficiency during the programming. Why somebody deleted my question and didn't let to be it closed? I found there many good answers although it was closed and now I can see absolutely nothing so I suppose it was deleted. Can somebody tell me smth?

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• Are these tables respect the 3NF Database Normalization?

  - by penas

  AUTHOR table Author_ID, PK First_Name Last_Name TITLES table TITLE_ID, PK NAME Author_ID, FK DOMAIN table DOMAIN_ID, PK NAME TITLE_ID, FK READERS table READER_ID, PK First_Name Last_Name ADDRESS CITY_ID, FK PHONE CITY table CITY_ID, PK NAME BORROWING table BORROWING_ID,pk READER_ID, fk TITLE_ID, fk DATE HISTORY table READER_ID TITLE_ID DATE_OF_BORROWING DATE_OF_RETURNING Are these tables respect the 3NF Database Normalization? What if 2 authors work together for the same title? The column Addresss should have it's own table? When a reader borrows a book, I make an entry in BORROWING table. After he returns the book, I delete that entry and I make another one entry in HISTORY table. Is this a good idea? Do I brake any rule? Should I have instead one single BORROWING table with a DATE_OF_RETURNING column?

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• Silverlight - GestureService & GestureListner in code-behind

  - by Rajah

  I want to do the following XAML code in code behind and not sure how to add the GestureService and GestureListner onto the Image. Xaml code: <Image Grid.Row="1" x:Name="img" VerticalAlignment="Center" HorizontalAlignment="Center" Width="200"> <toolkit:GestureService.GestureListener> <toolkit:GestureListener/> </toolkit:GestureService.GestureListener> </Image> Code behind equivalent: Image image = new Image(); //how do I add GestureService and GestureListner? ContentPanel.Children.Add(image);

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• JPA behaviour...

  - by Marcel

  Hi I have some trouble understanding a JPA behaviour. Mabye someone could give me a hint. Situation: Product entity: @Entity public class Product implements Serializable { ... @OneToMany(mappedBy="product", fetch=FetchType.EAGER) private List<ProductResource> productResources = new ArrayList<ProductResource>(); .... public List<ProductResource> getProductResources() { return productResources; } public boolean equals(Object obj) { if (obj == this) return true; if (obj == null) return false; if (!(obj instanceof Product)) return false; Product p = (Product) obj; return p.productId == productId; } } Resource entity: @Entity public class Resource implements Serializable { ... @OneToMany(mappedBy="resource", fetch=FetchType.EAGER) private List<ProductResource> productResources = new ArrayList<ProductResource>(); ... public void setProductResource(List<ProductResource> productResource) { this.productResources = productResource; } public List<ProductResource> getProductResources() { return productResources; } public boolean equals(Object obj) { if (obj == this) return true; if (obj == null) return false; if (!(obj instanceof Resource)) return false; Resource r = (Resource) obj; return (long)resourceId==(long)r.resourceId; } } ProductResource Entity: This is a JoinTable (association class) with additional properties (amount). It maps Product and Resources. @Entity public class ProductResource implements Serializable { ... @JoinColumn(nullable=false, updatable=false) @ManyToOne(fetch=FetchType.EAGER, cascade=CascadeType.PERSIST) private Product product; @JoinColumn(nullable=false, updatable=false) @ManyToOne(fetch=FetchType.EAGER, cascade=CascadeType.PERSIST) private Resource resource; private int amount; public void setProduct(Product product) { this.product = product; if(!product.getProductResources().contains((this))){ product.getProductResources().add(this); } } public Product getProduct() { return product; } public void setResource(Resource resource) { this.resource = resource; if(!resource.getProductResources().contains((this))){ resource.getProductResources().add(this); } } public Resource getResource() { return resource; } ... public boolean equals(Object obj) { if (obj == this) return true; if (obj == null) return false; if (!(obj instanceof ProductResource)) return false; ProductResource pr = (ProductResource) obj; return (long)pr.productResourceId == (long)productResourceId; } } This is the Session Bean (running on glassfish). @Stateless(mappedName="PersistenceManager") public class PersistenceManagerBean implements PersistenceManager { @PersistenceContext(unitName = "local_mysql") private EntityManager em; public Object create(Object entity) { em.persist(entity); return entity; } public void delete(Object entity) { em.remove(em.merge(entity)); } public Object retrieve(Class entityClass, Long id) { Object entity = em.find(entityClass, id); return entity; } public void update(Object entity) { em.merge(entity); } } I call the session Bean from a java client: public class Start { public static void main(String[] args) throws NamingException { PersistenceManager pm = (PersistenceManager) new InitialContext().lookup("java:global/BackITServer/PersistenceManagerBean"); ProductResource pr = new ProductResource(); Product p = new Product(); Resource r = new Resource(); pr.setProduct(p); pr.setResource(r); ProductResource pr_stored = (ProductResource) pm.create(pr); pm.delete(pr_stored); Product p_ret = (Product) pm.retrieve(Product.class, pr_stored.getProduct().getProductId()); // prints out true ???????????????????????????????????? System.out.println(p_ret.getProductResources().contains(pr_stored)); } } So here comes my problem. Why is the ProductResource entity still in the List productResources(see code above). The productResource tuple in the db is gone after the deletion and I do newly retrieve the Product entity. If I understood right every method call of the client happens in a new persistence context, but here i obviously get back the non-refreshed product object!? Any help is appreciated Thanks Marcel

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• jquery 'tablesorter' zebra widget do sort all column unnecessarily!

  - by I Like PHP

  i m using jQuery tablsorter plugin, it's working perfect,but now problem is ... i want to enable sorting only on 1'st and 3'rd column, and i also want to show different color of alternate row. i used widgets:[zebra], but using widget zebra, it enables sorting on all column as well as images(asc.gif,desc.gif,bg.gif) is also appearing on all headers whereas i only want these on only first and 3rd column how to use zebra widget with specific column sorting not the whole columns sorting here is my code <script type="text/javascript"> $(document).ready(function() { $("#managerTable").tablesorter({widgets: ['zebra']}, {sortList:[[0,0]],headers:{2:{sorter:false},4:{sorter:false}} }); }); </script>

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• Comments in Activity Stream

  - by fesja

  Hi, I'm starting to develop an activity stream. I've read both How to implement the activity stream in a social network and What’s the best manner of implementing a social activity stream?. What I haven't found is the best way to add comments to the activities. As in facebook, each comment can be commented by another person. If each activity comment is saved as another activity, then I would not be able to get the activity of that comment without doing a query. So the solution I'm thinking is to save the comments inside the serialize data field of each activity. If the user wants to delete his comment, I would have to update that activity. Is this the correct solution? Is there a better approach? Thanks!

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• What would the conditional statement be to filter these inputs?

  - by dmanexe

  I have a page with a form, and on the form are a bunch of input check boxes. In the following page, there's the following code to process the inputs from the page before (which are set as an ID). <? $field = $this->input->post('measure',true); $totals = array(); foreach($field as $value): $query = $this->db->get_where('items', array('id' => $value['input']))->row(); $totals[] = $query->price; ?> #HTML for displaying estimate output here <?php endforeach; ?> How would I have the loop run conditionally only if there was a check on the input on the page before?

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• Is it possible to have a JPanel over JTable

  - by YuppieNetworking

  Hello, I have a JTable whose associated TableModel could be initially empty. Therefore, it currently shows a JTable with its columns and no rows. In order to fill this JTable, I want the user to drag and drop elements from another component. The problem is that I would like to hint the user that he/she should drag elements to this table, with some message like "Drag xxx here to add a row". I thought that I could achieve this by putting a panel over the JTable , but I don't think it is possible with any java layout. Does anyone know how to do this? Or should I stick to a CardLayout to switch to/from the hint and the JTable? Thanks a lot

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• archiving table records to another table by trigger(move daialy table records to weekly table, evry

  - by sirvan

  I have written this trigger in mysql 5: create trigger changeToWeeklly after insert on tbl_daily for each row begin insert into tbl_weeklly SELECT * FROM vehicleslocation v where v.recivedate < curdate(); delete FROM tbl_daily where recivedate < curdate(); end; i want to archive records by date, move yesterday inserted record from dailly to weekly table and last weekly table to mounthly table and deletes this records from previous table this trigger has following error when insert in daily tabled occurred : "Can't update table 'tbl_daily' in stored function/trigger because it is already used by statement which invoked this stored function/trigger." please help me to solve th problem of archive old data in related tables: move yesterday inserted records to weekly table, if there is a reliable solution tell me please.

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• Reshape data frame to convert factors into columns in R

  - by Alexander L. Belikoff

  I have a data frame where one particular column has a set of specific values (let's say, 1, 2, ..., 23). What I would like to do is to convert from this layout to the one, where the frame would have extra 23 (in this case) columns, each one representing one of the factor values. The data in these columns would be booleans indicating whether a particular row had a given factor value... To show a specific example: Source frame: ID DATE SECTOR 123 2008-01-01 1 456 2008-01-01 3 789 2008-01-02 5 ... <more records with SECTOR values from 1 to 5> Desired format: ID DATE SECTOR.1 SECTOR.2 SECTOR.3 SECTOR.4 SECTOR.5 123 2008-01-01 T F F F F 456 2008-01-01 F F T F F 789 2008-01-02 F F F F T I have no problem doing it in a loop but I hoped there would be a better way. So far reshape() didn't yield the desired result. Help would be much appreciated.

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• saving information in file in php

  - by Mac Taylor

  hey guys i want to write a tracking system and now i can save in my Mysql database . but saving information about each ip that visits is a huge work for mysql so i think if i could save the information in a file , then there is no discussion about database and its problems . but to begin this : i realy dont know how to save in a file in a way that i can read it with no problem and show the details this is what is used to insert into my database sql_query("insert into tracking (date_time, ip_address, hostname,referer, page , page_title) values ('".sql_quote($dt)."', '".sql_quote($ipaddr)."', '".sql_quote($hostnm)."','$referer', '".sql_quote($pg)."', '".sql_quote($pagetitle)."')", $dbi); i need to show information about all ips in rows , after saving in a file what should i do to save and show in row order ( table ) php/mysql

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• Objective-C syntax

  - by mebFace

  I've been studying objective-c for a few days now. I keep coming across these two structures: NSString * somestring (NSString *) somestring I understand the first simply sets a pointer to an NSString object, but what does the second construct do, and when should I use it? What's the deal with the asterix marks? Sorry if this question doesn't make any sense, I am completely new to this language, and haven't even reached the level of asking proper questions. Main purpose -- I'm trying to decipher this method: -(NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger) row forComponent: (NSInteger)component *Also, the classes I chose don't matter. *

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