Search Results

Search found 30549 results on 1222 pages for 'object orientation'.

Page 827/1222 | < Previous Page | 823 824 825 826 827 828 829 830 831 832 833 834  | Next Page >

• How to choose a integer linear programming solver ?

  - by Cassie

  Hi all, I am newbie for integer linear programming. I plan to use a integer linear programming solver to solve my combinational optimization problem. I am more familiar with C++/object oriented programming on an IDE. Now I am using NetBeans with Cygwin to write my applications most of time. May I ask if there is an easy use ILP solver for me? Or does it depend on the problem I want to solve ? I am trying to do some resources mapping optimization. please let me know if any further information is required. Thank you very much, Cassie.

  Read the article

• iOS Efficiency File Saving Efficiency

  - by Guvvy Aba

  I was working on my iOS app and my goal is to save a file that I am receiving from the internet bit by bit. My current setup is that I have a NSMutableData object and I add a bit of data to it as I receive my file. After the last "packet" is received, I write the NSData to a file and the process is complete. I'm kind of worried that this isn't the ideal way to do it because of the limitations of RAM in a mobile device and it would be problematic to receive large files. My next thought was to implement a NSFileHandle so that as the file arrives, it would be saved to the disk, rather than the virtual memory. In terms of speed and efficiency, which method do you think will work decently on an iOS device. I am currently using the first, NSMutableData approach. Is it worth changing my app to use the NSFileHandle? Thanks in advance, Guvvy

  Read the article

• Throw exception from initializer list

  - by aaa

  hello. what is the best way to throw exception from initializer list? for example: class C { T0 t0; // can be either valid or invalid, but does not throw directly T1 t1; // heavy object, do not construct if t0 is invalid, by throwing before C(int n) : t0(n), // throw exception if t0(n) is not valid t1() {} }; I thought maybe making wrapper, e.g. t0(throw_if_invalid(n)). What is the practice to handle such cases? Thanks

  Read the article

• C# Delegate Invoke Required Issue

  - by Goober

  Scenario I have a C# windows forms application that has a number of processes. These processes run on separate threads and all communicate back to the Main Form class with updates to a log window and a progress bar. I'm using the following code below, which up until now has worked fine, however, I have a few questions. Code delegate void SetTextCallback(string mxID, string text); public void UpdateLog(string mxID, string text) { if (txtOutput.InvokeRequired) { SetTextCallback d = new SetTextCallback(UpdateLog); this.BeginInvoke(d, new object[] { mxID, text }); } else { UpdateProgressBar(text); } } Question Will, calling the above code about 10 times a second, repeatedly, give me errors, exceptions or generally issues?.....Or more to the point, should it give me any of these problems? Occasionally I get OutofMemory Exceptions and the program always seems to crash around this bit of code......

  Read the article

• Spring security custom principal bean

  - by wuntee

  I have a web application that is set up to use the default ldap server/authentication manager/authentication provider/user service. I have another DAO that already does majority of the work that those do (besides the authenticating a user) using Spring-LDAP. My problem is that I want the principal to be of my own custom bean class. What is the simplest way to do this? Initially I was thinking to create a custom authentication provider, but since the default one does exactly what I want, there doesnt seem to be a need. I am thinking I just need to override whatever object actually returns the Principal bean. Is this possible, and able to be injected into the security ldap authenticator context?

  Read the article

• JQUery autocompleter not working properly in IE8

  - by Pete Herbert Penito

  Hi everyone! I have some script which is working in firefox and chrome but in IE 8 I get this error: $.Autocompleter.defaults = { inputClass: "ac_input", resultsClass: "ac_results", loadingClass: "ac_loading", minChars: 1, delay: 400, matchCase: false, matchSubset: true, matchContains: false, cacheLength: 10, max: 100, mustMatch: false, extraParams: {}, selectFirst: true, //the following line throws the error, read down for error message formatItem: function(row) { return row[0]; }, formatMatch: null, autoFill: false, width: 0, multiple: false, multipleSeparator: ", ", highlight: function(value, term) { return value.replace(new RegExp("(?![^&;]+;)(?!<[^<])(" + term.replace(/([\^\$()[]{}*.+\?\|\])/gi, "\$1") + ")(?![^<])(?![^&;]+;)", "gi"), "$1"); }, scroll: true, scrollHeight: 180 }; ` the specific error reads: '0' is null or not an object can I perhaps change the the row[0] to something? This is found in jquery.autocomplete.js and it reads the same in firefox and doesn't cause the error, so i don't really want to change this if at all possible. any advice would help thanks!

  Read the article

• Parsing Wiki XML Dumps ver0.4 just got tough

  - by syed

  Hello, I am trying to parse Wikipedia XML Dump using "Parse-MediaWikiDump-1.0.4" along with "Wikiprep.pl" script. I guess this script works fine with ver0.3 Wiki XML Dumps but not with the latest ver0.4 Dumps. I get the following error. Can't locate object method "page" via package "Parse::MediaWikiDump::Pages" at wikiprep.pl line 390. Also, under the "Parse-MediaWikiDump-1.0.4" documentation @ http://search.cpan.org/~triddle/Parse-MediaWikiDump-1.0.4/lib/Parse/MediaWikiDump/Pages.pm, I read "LIMITATIONS Version 0.4 This class was updated to support version 0.4 dump files from a MediaWiki instance but it does not currently support any of the new information available in those files." Any work arounds would help me get to the next level. Note: one may wonder why cannot we directly use SAX or STAX parser instead, wikipedia dump is a 25GB plus single file, stack/memory issues are obvious. Hence, the above perl script resolves this issue but currently I am stuck with this version problem.

  Read the article

• T-SQL IsNumeric() and Linq-to-SQL

  - by cdonner

  I need to find the highest value from the database that satisfies a certain formatting convention. Specifically, I would like to fund the highest value that looks like EU999999 ('9' being any digit) select max(col) will return something like 'EUZ...' for instance that I want to exclude. The following query does the trick, but I can't produce this via Linq-to-SQL. There seems to be no translation for the isnumeric() function in SQL Server. select max(col) from table where col like 'EU%' and 1=isnumeric(replace(col, 'EU', '')) Writing a database function, stored procedure, or anything else of that nature is far down the list of my preferred solutions, because this table is central to my app and I cannot easily replace the table object with something else. What's the next-best solution?

  Read the article

• Django MultiWidget Phone Number Field

  - by Birdman

  I want to create a field for phone number input that has 2 text fields (size 3, 3, and 4 respectively) with the common "(" ")" "-" delimiters. Below is my code for the field and the widget, I'm getting the following error when trying to iterate the fields in my form during initial rendering (it happens when the for loop gets to my phone number field): Caught an exception while rendering: 'NoneType' object is unsubscriptable class PhoneNumberWidget(forms.MultiWidget): def __init__(self,attrs=None): wigs = (forms.TextInput(attrs={'size':'3','maxlength':'3'}),\ forms.TextInput(attrs={'size':'3','maxlength':'3'}),\ forms.TextInput(attrs={'size':'4','maxlength':'4'})) super(PhoneNumberWidget, self).__init__(wigs, attrs) def decompress(self, value): return value or None def format_output(self, rendered_widgets): return '('+rendered_widgets[0]+')'+rendered_widgets[1]+'-'+rendered_widgets[2] class PhoneNumberField(forms.MultiValueField): widget = PhoneNumberWidget def __init__(self, *args, **kwargs): fields=(forms.CharField(max_length=3), forms.CharField(max_length=3), forms.CharField(max_length=4)) super(PhoneNumberField, self).__init__(fields, *args, **kwargs) def compress(self, data_list): if data_list[0] in fields.EMPTY_VALUES or data_list[1] in fields.EMPTY_VALUES or data_list[2] in fields.EMPTY_VALUES: raise fields.ValidateError(u'Enter valid phone number') return data_list[0]+data_list[1]+data_list[2] class AdvertiserSumbissionForm(ModelForm): business_phone_number = PhoneNumberField(required=True)

  Read the article

• Does Google index HTTPS ASP.NET pages?

  - by ncakmak

  I have an online application that all of its pages use HTTPS. I have 3 questions: Does Google index HTTPS pages? I have a password protected single ASP.NET page (using HTTPS). Password protection is basically achieved by a Session object. When the correct password is entered, it hides the login panel and displays the same page which has a sensitive data. Is this page indexed by Google? I have a Secure folder that I implemented Forms Authentication. All pages in folder use HTTPS as well. Are the pages in this folder indexed by Google? Thank you for your help, Niyazi

  Read the article

• Ria Services vs WCF Dataservices

  - by NPehrsson

  My Team are evaluation to a bigger Business portal. (Invoicing, Bookkeeping, Salaries.....) We are all used to work with DDD, O/R mappers with NHibernate as our first choice. We have chosen to work with CompositeWPF to keep modularity between all modules and part system in the business portal. Now we have evaluated Ria Services and are kind of disappointed how it works in a Data Oriented way, Data Oriented can be good in a service oriented scenario, but we feel that we can with an Object Oriented approach to, and we feel that we can get an application with less complexity with the OO approach than the DO approach. For example it doesn't allow Value Objects, Many-to-many relations, everything needs to have keys and so on. We haven't looked at WCF Data Services yet so our question is WCF Data Services our answere? Does it integrate good with Silverlight 4? Can we work with it in a OO manor?

  Read the article

• Error when using StaticResource

  - by James Hay

  Hi, I'm getting this error Attribute {StaticResource StoryboardIntroAnimation} value is out of range when I try and use a staic resource as the Storyboard property of a BeginStoryboard object. The markup looks a little like this: <UserControl ...> <UserControl.Resources> <Storyboard x:Key="StoryboardIntroAnimation"> ... </Storyboard> </UserControl.Resources> <UserControl.Triggers> <EventTrigger> <EventTrigger.Actions> <BeginStoryboard Storyboard="{StaticResource StoryboardIntroAnimation}" /> </EventTrigger.Actions> </EventTrigger> </UserControl.Triggers> ... </UserControl> Does anyone know why this is happening?

  Read the article

• how to deep copy a class without marking it as serializable

  - by Gaddigesh

  I came across many questions on deep copy but non of them helped me I have a class say class A { ... public List<B> ListB; .... } where B is again another class which inturn may inherit/contain some other classes Take this scenario A is a very huge class and contain many reference types I can not mark B as serializable as i don't have access to source code of B(Though I can Mark A as serializable) Problem:below methods to perform deep copy does not work because I can not use Iclonable, memberwise clone technique as class A conatins many reference types I can not write a copy constructor for A , as the class is huge and keeps growing and contained classes (Like B) can't be deep copied I can't use serialization technique as i can not mark conatined class(like B, for which no source code avilaable) as serializable So how can I deep copy the object of Class A? (I read about "surrogate serialization" technique some where but not clear)

  Read the article

• Flex 4 Spark VideoDisplay in Popup causes memory leak

  - by Ben

  Hi, I'm currently building an air app with FB 4. I have a custom control that contains a VideoDisplay control, and which loaded using the PopupManager. Using the profiler, i've noticed that every time the my popup is loaded the memory for it gets allocated, but when it's closed the memory is never recovered. There's nothing else holding a reference to the popup. And if I don't set the source of the VideoDisplay object, then there is no leak - but as soon as the source is set I get a leak. I can't see any method to force close the stream or anything on the spark VideoDisplay control. Any idea or suggestions? EDIT: I have tried setting the source to null before closing the popup but that doesn't change anything. Also, I'm not holding any event listener to the video

  Read the article

• Python 3 with the range function

  - by Leif Andersen

  I can type in the following code in the terminal, and it works: for i in range(5): print(i) And it will print: 0 1 2 3 4 as expected. However, I tried to write a script that does a similar thing: print(current_chunk.data) read_chunk(file, current_chunk) numVerts, numFaces, numEdges = current_chunk.data print(current_chunk.data) print(numVerts) for vertex in range(numVerts): print("Hello World") current_chunk.data is gained from the following method: def read_chunk(file, chunk): line = file.readline() while line.startswith('#'): line = file.readline() chunk.data = line.split() The output for this is: ['OFF'] ['490', '518', '0'] 490 Traceback (most recent call last): File "/home/leif/src/install/linux2/.blender/scripts/io/import_scene_off.py", line 88, in execute load_off(self.properties.path, context) File "/home/leif/src/install/linux2/.blender/scripts/io/import_scene_off.py", line 68, in load_off for vertex in range(numVerts): TypeError: 'str' object cannot be interpreted as an integer So, why isn't it spitting out Hello World 490 times? Or is the 490 being thought of as a string? I opened the file like this: def load_off(filename, context): file = open(filename, 'r')

  Read the article

• Removing an Entity from an EntitySet during Iteration...

  - by Gregorius

  I've got this code... seems nice and elegant, but apparently the framework don't like it when i mess with a collection while iterating through it: foreach (KitGroup kg in ProductToTransfer.KitGroups) { // Remove kit groups that have been excluded by the user if (inKitGroupExclusions != null && inKitGroupExclusions.Contains(kg.KitGroupID)) ProductToTransfer.KitGroups.Remove(kg); else { // Loop through the kit items and do other stuff //... } } The error it throws when it iterates to the 2nd object in the collection is: "EntitySet was modified during enumeration" I know i could create a new collection of KitGroup objects (or even just IDs) that i want to remove, and then another loop afterwards to loop through these, and remove them from the collection, but this just seems like unnecessary extra code... can anybody suggest a more elegant way of achieving the same thing? Cheers Greg

  Read the article

• "TypeError: CreateText() takes exactly 8 arguments (5 given)" with default arguments

  - by Eli Nahon

  def CreateText(win, text, x, y, size, font, color, style): txtObject = Text(Point(x,y), text) if size==None: txtObject.setSize(12) else: txtObject.setSize(size) if font==None: txtObject.setFace("courier") else: txtObject.setFace(font) if color==None: txtObject.setTextColor("black") else: txtObject.setTextColor(color) if style==None: txtObject.setStyle("normal") else: txtObject.setStyle(style) return txtObject def FlashingIntro(win, numTimes): txtIntro = CreateText(win, "CELSIUS CONVERTER!", 5,5,28) for i in range(numTimes): txtIntro.draw(win) sleep(.5) txtIntro.undraw() sleep(.5) I'm trying to get the CreateText function to create a text object with my "default" values if the parameters are not used. (I've tried it with blank strings "" instead of None and no luck) I'm fairly new to Python and have little programming knowledge.

  Read the article

• How to get roles with JSR 196 authentification in GlassFish?

  - by deamon

  I want to use a custom authentication module conforming to JSR 196 in GlassFish 3. The interface javax.security.auth.message.ServerAuth has the method: AuthStatus validateRequest( MessageInfo messageInfo, javax.security.auth.Subject clientSubject, javax.security.auth.Subject serviceSubject ) AuthStatus can be one of several constants like FAILURE or SUCCESS. The question is: How can I get the roles from a "role datebase" with JSR 196? Example: The server receives a request with a SSO token (CAS token for example), checks whether the token is valid, populates the remote user object with roles fetches from a database via JDBC or from REST service via http. Is the role fetching in the scope of JSR 196? How could that be implemented? Do I have to use JSR 196 together with JSR 115 to use custom authentication and a custom role source?

  Read the article

• HTMLAgilityPack ChildNodes index works, named node does not

  - by XgenX

  I am parsing an XML API response with HTMLAgilityPack. I am able to select the result items from the API call. Then I loop through the items and want to write the ChildNodes to a table. When I select ChildNodes by saying something like: sItemId = dnItem.ChildNodes(0).innertext I get the proper itemId result. But when I try: sItemId = dnItem.ChildNodes("itemId").innertext I get "Referenced object has a value of 'Nothing'." I have tried "itemID[1]", "/itemId[1]" and a veriety of strings. I have tried SelectSingleNode and ChildNodes.Item("itemId").innertext. The only one that has worked is using the index. The problem with using the index is that sometimes child elements are omitted in the results and that throw off the index. Anybody know what I am doing wrong?

  Read the article

• PHP: How to dynamically add to http_build_query?

  - by oni-kun

  I have a scraping object basically. I want to be able to add POST variables to it like $obj->addvar('Name', 'Value'); What I have now is this: function addvar($var, $val) { $postvars[] = Array($var=>$val); } function initiate() { $this->q = $postvars; } if(!empty($this->post)) { $this->params = http_build_query($q); } I haven't tested because it's too incomplete, But would my addvar() function work? How on earth do I append a key+value to the array so http_build_query would accept it? IE (this is what I want): $obj->addvar('username', 'abc'); $obj->addvar('password', 'foobar'); $obj->send(); //..

  Read the article

• Dispatcher.Invoke not working in .NET 3.0 SP1

  - by Kapil

  I am developing a WPF windows application and am getting into a trouble running the app in .NET 3.0. Everytime that I try to access the System.Windows.Threading.Dispatcher.Invoke() method, I get a method-not-found error. Basically, I spawn a new thread from the main thread and try to change some UI properties (basically update a progress-bar) from the new thread using the following code: updateStatusDelegate usd = new updateStatusDelegate(progressBar.SetValue); Dispatcher.Invoke(usd, System.Windows.Threading.DispatcherPriority.Background, new object[] { System.Windows.Controls.ProgressBar.ValueProperty, Convert.ToDouble(perc) }); Can someone help me understand why do I encounter this error in .NET 3.0 version? I am able to get this going in .NET 3.0 SP2. But I guess .NET is not distributed independantly and is packaged only with .NET 3.5 version. My goal is to get away with the dependancy of .net 3.5 and have a dependancy on .NET 3.0 version Any help would be appreciated. Thanks Kapil

  Read the article

• django auth : strange error with authenticate()

  - by Rohit

  I am using authenticate() to authenticating users manually. Using admin interface I can see that there is no 'last_login' attribute for Users Debug traceback is : Environment: Request Method: GET Request URL: https://localhost/login/ Django Version: 1.1.1 Python Version: 2.6.5 Installed Applications: ['django.contrib.auth', 'django.contrib.contenttypes', 'django.contrib.sessions', 'django.contrib.sites', 'django.contrib.admin', 'mobius.polls'] Installed Middleware: ('django.middleware.common.CommonMiddleware', 'django.contrib.sessions.middleware.SessionMiddleware', 'django.contrib.auth.middleware.AuthenticationMiddleware') Traceback: File "/usr/lib/pymodules/python2.6/django/core/handlers/base.py" in get_response 92. response = callback(request, *callback_args, **callback_kwargs) File "/usr/lib/pymodules/python2.6/django/contrib/auth/__init__.py" in login 55. user.last_login = datetime.datetime.now() Exception Type: AttributeError at /login/ Exception Value: 'unicode' object has no attribute 'last_login' I cant figure out, why is there this discrepancy. Any kind of help would be appreciated. Thanks in advance!

  Read the article

• SqlDataReader / DbDataReader implementation question

  - by Jose

  Does anyone know how DbDataReaders actually work. We can use SqlDataReader as an example. When you do the following cmd.CommandText = "SELECT * FROM Customers"; var rdr = cmd.ExecuteReader(); while(rdr.Read()) { //Do something } Does the data reader have all of the rows in memory, or does it just grab one, and then when Read is called, does it go to the db and grab the next one? It seems just bringing one into memory would be bad performance, but bringing all of them would make it take a while on the call to ExecuteReader. I know I'm the consumer of the object and it doesn't really matter how they implement it, but I'm just curious, and I think that I would probably spend a couple hours in Reflector to get an idea of what it's doing, so thought I'd ask someone that might know. I'm just curious if anyone has an idea.

  Read the article

• [Cocoa] NSTableView bound to NSArrayController

  - by ndg

  Within Interface Builder I've got an NSTableView with two columns bound to a vanilla NSArrayController. The NSArrayController has its Content Array bound to an NSMutableArray in my application delegate. I've used further bindings to setup the addition and removal of rows via bindings (magic!). The issue I'm running into now is that I'd like to grab the currently selected NSTableView row and use its index to look-up the object stored in my NSArrayControllers associated array. The problem I'm running into is trying to access the NSTableView. Within my application delegate, using the following code will cause my application to crash: NSLog(@"%@", [timersTableView selectedRow]); Similarly, this also causes my application to crash: NSLog(@"%@", [timersController selectionIndex]); Given the simplicity of the code above, I must be doing something fundamentally wrong?

  Read the article

• Style: Dot notation vs. message notation in Objective-C 2.0

  - by groundhog

  In Objective-C 2.0 we got the "dot" notation for properties. I've seen various back and forths about the merits of dot notation vs. message notation. To keep the responses untainted I'm not going to respond either way in the question. What is your thought about dot notation vs. message notation for property accessing? Please try to keep it focused on Objective-C - my one bias I'll put forth is that Objective-C is Objective-C, so your preference that it be like Java or JavaScript aren't valid. Valid commentary is to do with technical issues (operation ordering, cast precedence, performance, etc), clarity (structure vs. object nature, both pro and con!), succinctness, etc. Note, I'm of the school of rigorous quality and readability in code having worked on huge projects where code convention and quality is paramount (the write once read a thousand times paradigm).

  Read the article

< Previous Page | 823 824 825 826 827 828 829 830 831 832 833 834  | Next Page >