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• Name Value Pairs in a ComboBox

  - by JamesB

  I'm convinced this must be a common problem, but I can't seem to find a simple solution... I want to use a combobox control with name value pairs as the items. ComboBox takes TStrings as its items so that should be fine. Unfortunately the drawing method on a combobox draws Items[i] so you get Name=Value in the box. I'd like the value to be hidden, so I can work with the value in code, but the user sees the name. Any Ideas?

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• Lots of pointer casts in QGraphicsView framework and performance

  - by kleimola

  Since most of the convenience functions of QGraphicsScene and QGraphicsItem (such as items(), collidingItems(), childItems() etc.) return a QList you're forced to do lots of qgraphicsitem_cast or static_cast and QGraphicsItem::Type() checks to get hold of the actual items when you have lots of different type of items in the scene. I thought doing lots of subclass casts were not a desirable coding style, but I guess in this case there are no other viable way, or is there? QList<QGraphicsItem *> itemsHit = someItem->collidingItems(Qt::IntersectsItemShape); foreach (QGraphicsItem *item, itemsHit) { if (item->type() == QGraphicsEllipseItem::type()) { QGraphicsEllipseItem *ellipse = qgraphicsitem_cast<QGraphicsEllipseItem *>(item); // do something } else if (item->type() == MyItemSubclass::type()) { MyItemSubClass *myItem = qgraphicsitem_cast<MyItemSubClass *>(item); // do something } // etc } The above qgraphicsitem_cast could be replaced by static_cast since correct type is already verified. When doing lots of these all the time (very dynamic scene), will the numerous casting affect performance beyond the normal if-else evaluation?

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• VB.NET take each letter of a word and display in ListBox

  - by Kaleet

  Private Sub btnWord_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnWord.Click Dim Inputter As String Dim Words As String = "" Do Inputter = InputBox("Enter word", "Enter Word") If Inputter <> String.Empty Then lstDisplay.Items.Add(Inputter) Word += Inputter.Substring(0, 1) End If Loop Until Inputter <> String.Empty ' SOMETHING GOES HERE!!!!!' lstDisplay.Items.Add("---") lstDisplay.Items.Add(Word) End Sub Here is how it works, when you click the button it displays an input box so for example type in "CAT". But I can't figure out how to get it to do C (newline) A (newline) T (newline) within the listbox. Please help! C A T - CAT

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• Files mapping architecture

  - by user326198

  I need to know How I can achieve this goal by classes : we have two different applications in the company (App1 , App2) Appl can export xml with know items ( ID , Name) we need app2 to import this data but App2 display different items (CarID, CarName) and this items defined like this with the mapping info <CarID> <Mapping name="ID"/> </CarID> <CarNAme> <Mapping name="Name"/> </CarNAme>" How I can achieve this as classes or ARCHITECTURE , i will develop this with c# I need one interface because we may support different type of files not just xml

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• Item-Level Permissions (Edit only their own but, read everyones)...

  - by Jason

  I have a list which I've set item-level permissions on. I set it to allow users to read all items and only edit their own items... The issue is that if I do this then I can still edit all items... If I change it so that I can only read my own and only edit my own then it works as expected... Anyone have any thoughts on why this would be occurring and a solution... I've set the list up to only allow one user account with contribute rights for testing purposes...

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• jquery bubblepopup inside jquery carousel

  - by sam

  Hi, I am trying to use the jquery bubble popup inside the jquery carousel. the problem everything works fine. but say if i have 10 items in the carousel, display 5 at a time, hiding the remaining 5 items(which could be opened by clicking the left or right navigation). so when we move the mouse over each carousel item that is visible on the screen, we can see the bubble popup. here, if i move the mouse over the empty area on the screen, i am still getting the bubble pop which shouldnt be visible because that particular carousel item is hidden.if i keep on moving over all the hidden items, i am able to see the bubble popup. is there anyway to hide the bubble pop when the carousel item is not visible on the screen.

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• How would I initialize these two lists so that modifying one doesn't modify the other?

  - by Brandon

  I'm aware of why this is happening, but is there any way to do this without having to implement ICloneable or a Copy() method? Preferably .net 2.0, but 3.5 is fine if it is necessary. Essentially I'm trying to implement an undo method. In most cases I can just perform the reverse action in the Undo(), but for others that is not possible. So I want to keep two lists. One for the list of items that I will be modifying, and one for the original, unmodified list of items. This way if I need to do an undo, I just delete the modified items and replace them with the originals. Most of the ways I've tried to assign the _originalItems variable doesn't work, so what would I need to do? public MyClass(List<SelectedItems> selectedItems) { _selectedItems = new List<SelectedItems>(selectedItems); _originalItems = ?? }

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• how ca i make Description panel to pause after it is shown on the slideshow?

  - by ershad

  I am new to Javascript. I have a slide show with images fading and description coming from left to right. I need to pause the description panel for some sec. How can i do that? The code is: showhidedescpanel:function(state, animateduration){ var setting=this.setting var endpoint=(state=="show")? setting.dimensions[1]-setting.panelwidth : this.setting.dimensions[1]-410 setting.$descpanel.stop().animate({left:endpoint}, (2000), function(){ if (setting.descreveal=="always" && state=="hide") setting.$restorebutton.css({visibility:'visible'}) //show restore button }) }

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• iPhone - In App Purchase questions

  - by diwup

  Hey guys, Merry Christmas. I have two questions on In App Purchase. iAP application process: do I need to submit my iAP items applications, wait for Apple's responses, then build my app accordingly, or, I can just create some iAP items, build them into my app, then after everything's done, submit my binary to Apple? Intermediary currency: on Apple's documentation I found these sentences: "You may not offer items that represent intermediary currency because it is important that users know the specific good or service that they are buying." However, I found a few apps on the App Store offering its users with different kinds of intermediary currency. I'm confused. Is this a gray area in which we developers can play some tricks? Thanks in advance. Di

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• updated validation example for web api

  - by MonkeyBonkey

  I tried the validation example code for web api on the latest mvc 4 download and I'm getting some errors. Does anyone have an updated example of the ValidationActionFilter class. Here's the original code public class ValidationActionFilter : ActionFilterAttribute { public override void OnActionExecuting(HttpActionContext context) { var modelState = context.ModelState; if (!modelState.IsValid) { dynamic errors = new JsonObject(); foreach (var key in modelState.Keys) { var state = modelState[key]; if (state.Errors.Any()) { errors[key] = state.Errors.First().ErrorMessage; } } context.Response = new HttpResponseMessage<JsonValue>(errors, HttpStatusCode.BadRequest); } } } I'm getting an error on HttpResponseMessage The non-generic type 'System.Net.Http.HttpResponseMessage' cannot be used with type arguments Also it looks like I need to add a Json reference, but should I be using JSON.net instead? An example of this using Json.net?

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• Why does a Linq Cast<T> operation fail when I have an implicit cast defined?

  - by Ryan Versaw

  I've created two classes, with one of them having an implicit cast between them: public class Class1 { public int Test1; } public class Class2 { public int Test2; public static implicit operator Class1(Class2 item) { return new Class1{Test1 = item.Test2}; } } When I create a new list of one type and try to Cast<T> to the other, it fails with an InvalidCastException: List<Class2> items = new List<Class2>{new Class2{Test2 = 9}}; foreach (Class1 item in items.Cast<Class1>()) { Console.WriteLine(item.Test1); } This, however, works fine: foreach (Class1 item in items) { Console.WriteLine(item.Test1); } Why is the implicit cast not called when using Cast<T>?

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• Would Python's Twisted library be the best case for an observer type pattern?

  - by beagleguy

  hi all, I'm developing a system where a queue will be filled with millions of items I need a process that reads items from the queue constantly and then sends those items out to registered clients. I'm thinking about using twisted for this, having the queue reader be a twisted server listening on a tcp port then clients can connect on that port and when an item is pulled from the queue the server writes it out to all the clients. Does that sound like something that twisted would be ideal for? Does anyone know of any sample code out there that may do something similar? thanks

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• boost::this_thread::disable_interruption usage confusion

  - by Evgenii

  boost/thread/pthread/shared_mutex.hpp contains this code: ... #include <boost/thread/detail/thread_interruption.hpp> ... class shared_mutex { ... void lock_shared() { boost::this_thread::disable_interruption do_not_disturb; boost::mutex::scoped_lock lk(state_change); while(state.exclusive || state.exclusive_waiting_blocked) { shared_cond.wait(lk); } ++state.shared_count; } ... }; but boost/thread/detail/thread_interruption.hpp does not contain implementation of disable_interruption, only the prototype. in boost_1_42_0/libs/thread/src/pthread we don't have the implementation too how does it work!???

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• C#, Generic Lists and Inheritance

  - by Andy

  I have a class called Foo that defines a list of objects of type A: class Foo { List<A> Items = new List<A>(); } I have a class called Bar that can save and load lists of objects of type B: class Bar { void Save(List<B> ComplexItems); List<B> Load(); } B is a child of A. Foo, Bar, A and B are in a library and the user can create children of any of the classes. What I would like to do is something like the following: Foo MyFoo = new Foo(); Bar MyBar = new Bar(); MyFoo.Items = MyBar.Load(); MyBar.Save(MyFoo.Items); Obviously this won't work. Is there a clever way to do this that avoids creating intermediate lists? thanks, Andy

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• css3 nth child question

  - by JCHASE11

  Hello. I am designing a 960px wide layout with an unordered list. Each list item is 240px wide, so 4 list items fit horizontally in a row. I have about 20 rows on the page.... I want every other list item to have a background of #ececec, so my css would be: ul li:nth-child(2n+2){ background-color:#ececec; } This works. The only problem is because there are 4 items in a row (an even #), the next row would be identical, thus rendering background colors on every 1st and 3rd list items in a row. This is not the effect I am looking to achieve. I want the background colors to alternate, creating a grid-like effect. What is the correct css to do so (think a checker board). Thanks!

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• Viewstate seems to be hijacked inadvertently

  - by dvr

  Hi, we are using asp.net 2.x, we use session state stored in sql server, 2 web servers in loadbalance, iis6. our issue is that in the last 3 months we have had 2 cases where some one using our enquiry form has seen someone else's info e.g. first name and last name. We are not populating the form from objects in session so I have come to the conclusion that the second user has somehow received the viewstate from the first user, after that user has tried to submit and got an error e.g. has posted view state and returned the the same page and the other user has requested that page at the same time (must have been on the same server I am guessing if it is a viewstate issue). have any of you experienced this before? some questions mulling around in my head is how does the worker process know to retun view state to a unique request and how does it determine a unique request etc..

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• Get count matches in query on large table very slow

  - by Roy Roes

  I have a mysql table "items" with 2 integer fields: seid and tiid The table has about 35000000 records, so it's very large. seid tiid ----------- 1 1 2 2 2 3 2 4 3 4 4 1 4 2 The table has a primary key on both fields, an index on seid and an index on tiid. Someone types in 1 or more tiid values and now I would like to get the seid with most results. For example when someone types 1,2,3, I would like to get seid 2 and 4 as result. They both have 2 matches on the tiid values. My query so far: SELECT COUNT(*) as c, seid FROM items WHERE tiid IN (1,2,3) GROUP BY seid HAVING c = (SELECT COUNT(*) as c, seid FROM items WHERE tiid IN (1,2,3) GROUP BY seid ORDER BY c DESC LIMIT 1) But this query is extremly slow, because of the large table. Does anyone know how to construct a better query for this purpose?

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• How to count the number of listitems in an asp.bulletedlist with JavaScript

  - by Andy5

  Hi I have an asp:bulletedlist control, which sits inside a div tag, and I need to count the number of list items inside the control. Searching the internet, and noting the fact the html given back by the items is a list i.e. <li>, I thought I could use an example of: var listcontrol = document.getElementById('BulletedList1'); var countItems = listcontrol.getElementByTagName('li').length; However, when I do this, it throws and error saying that no object exists for this control. So, my problem is, and because I must do this clientside because I want to use this to set the height of the div tag, is how do you count the number of items inside a asp:bulletedlist control with javascript?

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• ASP.NET Session StateServer - is it possible to extract info about current sessions?

  - by Moe Sisko

  I'm looking into changing the ASP.NET session state mode of our application from SQLServer to StateServer (for performance reasons). In SQLServer mode, it is easy to extract information about the current sessions by querying SQL Server tables like ASPStateTempSessions. e.g. things like when each session was created, when it is due to expire, etc. You could even query the session state blob data to extract further application specific info (e.g. like the UserID, if it was saved in session state). This info was useful for administrators. Just wondering if anyone has managed to do something similar for StateServer mode.

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• Problem with outputting html via AJAX

  - by Marek

  Hello I am new to JS and AJAX, but I have to do my homework. I choose jQuery, so it little easy now. I want to get a html via AJAX request, but in result it looks, ex: <fieldset id=\"item4\" class=\"item\"><legend>Odno\u015bnik 4<\/legend> I set response content-type to text/html. When I outputting result on server everything is ok. jQuery code: enter code here $.ajax({ dataType : 'html', data : 'add_sz='+changeSize+'&next_id='+nextId, url : '/kohana/admin/menus/ajax_items_refresh', error : function(err, xhr, status) { msgOutput.text('error msg'); }, success : function(data, xhr, textStatus) { msgOutput.text('success msg'); var tabs = $('#items-list'); $('#items-wrap').html($('#items-wrap').html() + data); Could somebody help me? What I am doing wrong? Kind Regards.

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• sql server - bulk insert error

  - by user554134

  I am using bulk insert and getting below error: Note: The data in the load file is not beyong the configured column length Running Command: bulk insert load_data from 'C:\temp\dataload\load_file.txt' with (firstrow = 1, fieldterminator = '0x09', rowterminator = '\n',MAXERRORS = 0, ERRORFILE = 'C:\temp\dataload\load_file') Contents of load file: user_name file_path asset_owner city import_date admin C:\ admin toronto 04/12/2012 Error: Msg 4863, Level 16, State 1, Line 1 Bulk load data conversion error (truncation) for row 1, column 6 (validated). Msg 7399, Level 16, State 1, Line 1 The OLE DB provider "BULK" for linked server "(null)" reported an error. The provider did not give any information about the error. Msg 7330, Level 16, State 2, Line 1 Cannot fetch a row from OLE DB provider "BULK" for linked server "(null)".

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• Return an opaque object to the caller without violating type-safety

  - by JS Bangs

  I have a method which should return a snapshot of the current state, and another method which restores that state. public class MachineModel { public Snapshot CurrentSnapshot { get; } public void RestoreSnapshot (Snapshot saved) { /* etc */ }; } The state Snapshot class should be completely opaque to the caller--no visible methods or properties--but its properties have to be visible within the MachineModel class. I could obviously do this by downcasting, i.e. have CurrentSnapshot return an object, and have RestoreSnapshot accept an object argument which it casts back to a Snapshot. But forced casting like that makes me feel dirty. What's the best alternate design that allows me to be both type-safe and opaque?

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• Why are Objective-C instance variables declared in an interface?

  - by Chase

  I'm just getting into Objective-C (Java is my primary OO language). Defining an object's instance variables in the interface instead of the class seems strange. I'm used to an interface being a public API definition with nothing besides method signatures (not counting constants here). Is there some reason that state is defined in an interface (even if it is private) and behaviour is defined in a class. It just seems odd that since objects are state+behavior that the definition would be split into two separate places. Is it a design benefit is some way? A pain in the rear issue that you are just forced to deal with in Objective-C? A non-issue, just different? Any background on why it's done this way? Or can you put object state in a class and I just haven't hit that part in my book yet?

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• Rails validation issue with before_validation

  - by Chance

  I'm still fairly new to rails so I'm not sure what I'm missing here. I'm using GeoKit to geocode an address upon saving. I have a method that geocodes an address and if it fails to find it, it adds an error to the errors list. I've tested it in the console and it is failing on the geocode (presumably adding the error) but still saving successfully. acts_as_mappable before_validation_on_create :geocode_address before_validation_on_update :geocode_address validates_presence_of :street validates_presence_of :city validates_presence_of :state validates_presence_of :zip validates_presence_of :name validates_uniqueness_of :name def geocode_address geo=Geokit::Geocoders::MultiGeocoder.geocode ("#{street}, #{city}, #{state}, #{zip}") puts "geocoded: #{street}, #{city}, #{state}, #{zip}" if geo.success self.lat, self.lng = geo.lat,geo.lng else errors.add(:street, "Could not Geocode address") end puts "geo status: #{geo.success}" end Any help would be greatly appreciated, thanks :)

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• allow only distinct values in ComboBox

  - by Ravinder Gangadher

  In my project, I am trying to populate ComboBox from DataSet. I succeeded in populating but the values inside the ComboBox are not distinct (Because it just showing the values present in DataSet). I cant bind the ComboBox to DataSet because I am adding "Select" text at first of populating the values. Here is my code. ComboBox --> cmb DataSet --> ds DataSet Column Name --> value(string) cmb.Items.Clear(); cmb.Items.Add("Select"); for (int intCount = 0; intCount < ds.Tables[0].Rows.Count; intCount++) { cmb.Items.Add(ds.Tables[0].Rows[intCount][value].ToString()); } cmb.SelectedIndex = 0; My question is how to allow distinct values (or restrict duplicate values) inside the ComboBox.

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