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• Boost Thread Specific Storage Question (boost/thread/tss.hpp)

  - by Hassan Syed

  The boost threading library has an abstraction for thread specific (local) storage. I have skimmed over the source code and it seems that the TSS functionality can be used in an application with any existing thread regardless of weather it was created from boost::thread --i.e., this implies that certain callbacks are registered with the kernel to hook in a callback function that may call the destructor of any TSS objects when the thread or process is going out of scope. I have found these callbacks. I need to cache HMAC_CTX's from OpenSSL inside the worker threads of various web-servers (see this, detailed, question for what I am trying to do), and as such I do not controll the life-time of the thread -- the web-server does. Therefore I will use the TSS functionality on threads not created by boost::thread. I just wanted to validate my assumptions before I started implementing the caching logic, are there any flaws in my logic ?

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• C# .NET MVC Call an action from another controller

  - by Brian

  I have two different objects: contracts, and task orders. My requirements specify that in order to view the Details for either object, the Url should be "http://.../Contract/Details" or "http://.../TaskOrder/Details" depending on which type. They are both very similar and the details pages are almost identical, so I made a class that can either be a contract or a task order, and has a variable "objectTypeID" that says which type it is. I wrote the action "Details" in the task order controller, but now I want to call that from the contract controller instead of recopying the code. So is there any way to have the url still say ".../Contract/Details" but call the action in the TaskOrder controller instead? I tried using TaskOrderController TOController = new TaskOrderController(); TOController.Details(id); This would have worked except that I can't use the HttpContext.Session anymore, which I used several times in the action.

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• Using Facebook Graph to simply post a wall message with just javascript

  - by Glycerine

  Hey guys, Now I know this question has been asked similarly a lot of times but I'm really struggling here. Its a simple thing I need to do: I would like to post a message onto a users wall saying "I scored 8/10 on objects game" then a URL Thats it. I don't mind if facebook needs to authenticate and then post the message. and I really don't want to have to use the full API - as I don't want to handle user login details. Is it possible using the new Graph API and javascript. Uber thanks guys this'll allow me to sleep tonight.

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• Why does python use 'magic methods'?

  - by Greg Beech

  I've been playing around with Python recently, and one thing I'm finding a bit odd is the extensive use of 'magic methods', e.g. to make its length available an object implements a method def __len__(self) and then it is called when you write len(obj). I was just wondering why objects don't simply define a len(self) method and have it called directly as a member of the object, e.g. obj.len()? I'm sure there must be good reasons for Python doing it the way it does, but as a newbie I haven't worked out what they are yet.

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• zoom_changed only triggers once in google maps api version 3 using MVC

  - by fredrik

  Hi, I'm trying to use the MVC objects in google maps version 3. What I can't seem to figure out is why my zoom_changed method is only invoked once. When I first load the map the zoom_changed method is invoked. But not when I zoom on the map. function MarkerWidget (options) { this.setValues(options); this.set('zoom', this.map.zoom); var marker = new google.maps.Marker({ icon : this.icon, mouseOverIcon : this.mouseOverIcon, orgIcon : this.orgIcon }); marker.bindTo('map', this); marker.bindTo('position', this); google.maps.event.addListener(marker, 'mouseover', this.onmouseover); google.maps.event.addListener(marker, 'mouseout', this.onmouseout); } MarkerWidget.prototype = new google.maps.MVCObject(); MarkerWidget.prototype.zoom_changed = function () { $.log(this, new Date()); } Shouldn't the map object fire the zoom event and notify all object's that has "this.set('zoom', this.map.zoom)" ? ..fredrik

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• Tomcat6 MySql JDBC Datasource configuration

  - by Bob

  Hi, I've always used Spring's dependency injection to get datasource objects and use them in my DAOs, but now, I have to write an app without that. With Spring I can write something like this: <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource"> <property name="driverClassName" value="com.mysql.jdbc.Driver" /> <property name="url" value="jdbc:mysql://127.0.0.1/app?characterEncoding=UTF-8" /> <property name="username" value="u" /> <property name="password" value="p" /> </bean> But how can I use datasource in my DAOs without Spring or anything? I'm using servlets and JSPs only. Performance is very important factor. Thanks in advance!

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• WCF - Compact Framework - Pull data from mobile client

  - by jagse

  Hello guys, I want to communicate xml serialized objects from the server to the client and the other way arround. Now it is (probably) easy to invoke methods from a mobile client (compact framework) using WCF, but is there a way so that the server can invoke methods on the client side or some other way to pull data from the client? I know that callback contracts are not available in the compact framework as you can see here: http://blogs.msdn.com/andrewarnottms/archive/2007/09/13/calling-wcf-services-from-netcf-3-5-using-compact-wcf-and-netcfsvcutil-exe.aspx Originally I thought of socket programming and of developing this by myself, then someone here mentioned WCF. But it seems like WCF only would work in a non mobile environment as I need callbacks. Anyone can help me with this? Is it possible to develop a two way communication with a desktop server and multiple mobile clients using WCF, or will I have to do socket programming? Thanks for any advice or any kind of help!

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• Django/MySQL - __istartswith not producing case-insensitive query.

  - by TheLizardKing

  I make use of generic views and I am attempting to query my MySQL db (utf8_bin collation) in a case insensitive manor to try to find all my song titles that start with a particular letter. view.py def tracks_by_title(request, starts_with): return object_list( request, queryset = Track.objects.filter(title__istartswith=starts_with), template_name = 'tlkmusic_base/titles_list.html', template_object_name = 'tracks', paginate_by = 25, ) and my urls.py urlpatterns = patterns('tlkmusic.apps.tlkmusic_base.views', (r'^titles/(?P<starts_with>\w)/$', tracks_by_title), ) the query it produces according to the django debug toolbar is: SELECT `tracks`.`id`, `tracks`.`url`, `tracks`.`artist`, `tracks`.`album`, `tracks`.`genre`, `tracks`.`year`, `tracks`.`title`, `tracks`.`comment`, `tracks`.`tracknumber`, `tracks`.`discnumber`, `tracks`.`bitrate`, `tracks`.`length`, `tracks`.`samplerate`, `tracks`.`filesize`, `tracks`.`createdate`, `tracks`.`modifydate` FROM `tracks` WHERE `tracks`.`title` LIKE a% LIMIT 1 specifically this line: WHERE `tracks`.`title` LIKE a% LIMIT 1 Why is it not ILIKE which is what I was expecting by using __istartswith? I am using Django 1.1.1 on Ubuntu.

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• Can not clone git repo to server

  - by Classified

  I'm running the same command on 2 different servers. One works, the other doesn't. I'm running git clone https://blah.com:8443/blah.git On server A, it works fine. I get the objects, files, etc. no problems. On server B, I get the following message. git clone https://blah.com:8443/blah.git Cloning into 'blah'... error: Peer certificate cannot be authenticated with known CA certificates while accessing https://blah.com:8443/blah.git/info/refs?service=git-upload-pack fatal: HTTP request failed Does anyone know what this means or what I need to do to get this to work? Thanks in advance for any help you can give me.

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• ASP.NET - dynamically creating database connection in datasets

  - by Foo

  I am currently using datasets for my data access layer. I currently store the connection string in the web.config file. I need the ability to change the connection to another database before any queries are processed. Is there an event that is triggered or a base class that can be modified that intercepts the process of retrieving the connection string from the web.config file? Is there any way to handle multiple database connections using the same code base and also take advantage of the connection pooling? I understand the best method is to get rid of datasets and use custom data objects. Any ideas?

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• Is the heap actually a heap?

  - by ElectricDialect

  In .NET (and Java as far as I know), the area where objects are dynamically allocated is referred to as the managed heap. However, most documentation that describes how the managed heap works depicts it as a linear data structure, such as a linked list or stack. So, is the managed heap actually a heap, or is it implemented with some other data structure? If it actually does not use a heap data structure, is seems like a significant failure of terminology to overload the meaning of this word. If it is in fact a heap data structure, what is the value that satisfies the heap property: the size of the allocated memory region?

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• WPF: Soft deletes and binding?

  - by aks

  I have custom objects which implement INotifyProperyChanged and now I'm wondering if it is possible to implement soft delete which would play nicely with binding? Each object would have a IsDeleted property and if this property would be set to true than it would not be displayed in GUI. I was thinking about making a custom markup extension which would decorate Binding class but it hadn't worked out as expected. Now I'm considering using MultiBinding with IsDeleted as one of bound properties so that converter would be able to figure out which object is deleted. But this solution sounds quite complicated and boring. Does anybody have an idea how to implement soft deletes for binding?

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• Is it worthwhile to implement observer pattern in PHP?

  - by Extrakun

  I have been meaning to make use of design pattern in PHP, such as the observer pattern, but that I have to recreate the observers' relationship each time the page is loaded pains me. As references are saved as a new concrete objects in session, there is no way to preserve relationships between subscribers and their observers unless you use a GUID or some other properties to form a lookup, and store that property instead. With the cost of recreating the relationships each time a page is loaded, is it worthwhile to use design patterns such as observers in PHP, compared to having a clean design? Any real-world experience to share?

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• Why is my app running

  - by John Smith

  I have compiled my iPhone app with setting (Device, Release). I install it on the test machine and it runs with no problem. Here's the problem. The app is linked to a C++ library. The compilation on the simulator has no errors. However the device compilation produces 568 errors, mostly about different visibilities w.r.t AppDelegate.o. They all look like: QL::Error::~Error()has different visibility (default) in /QL/build/Release-iphoneos/libQLLibrary.a(abcd.o) and (hidden) in /Programming/ObjC/Second/build/Second.build/Release-iphoneos/FG.build/Objects-normal/armv6/AppDelegate.o Why is this, and how can I stop the errors anyway?

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• How to override equals method in java

  - by Subash Adhikari

  I am trying to override equals method in java. I have a class People which basically has 2 data fields name and age. Now I want to override equals method so that I can check between 2 People objects. My code is as follows public boolean equals(People other){ boolean result; if((other == null) || (getClass() != other.getClass())){ result = false; } // end if else{ People otherPeople = (People)other; result = name.equals(other.name) && age.equals(other.age); } // end else return result; } // end equals But when I write age.equals(other.age) it gives me error as equals method can only compare String and age is Integer. Please help me fix this. Thanks is Advance.

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• Sending multipart response for downloads in Zend Framework

  - by takeshin

  I'm sending files in action helper for downloads (in parts if needed) like this: ... $response->sendHeaders(); $chunksize = 1 * (1024 * 1024); $bytesSent = 0; if ($httpRange) { fseek($file, $range); } while(!feof($file) && (!connection_aborted() && ($bytesSent < $newLength)) ) { $buffer = fread($file, $chunksize); // $response->appendBody($buffer); // this would be better print($buffer); flush(); $bytesSent += strlen($buffer); } fclose($file); I suspect that better way would be to make use of $response object instead of print. Which is the recommended way to send big response objects using Zend Framework?

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• How can I test to see if a class contains a particular attribute?

  - by BryanWheelock

  How can I test to see if a class contains a particular attribute? In [14]: user = User.objects.get(pk=2) In [18]: user.__dict__ Out[18]: {'date_joined': datetime.datetime(2010, 3, 17, 15, 20, 45), 'email': u'[email protected]', 'first_name': u'', 'id': 2L, 'is_active': 1, 'is_staff': 0, 'is_superuser': 0, 'last_login': datetime.datetime(2010, 3, 17, 16, 15, 35), 'last_name': u'', 'password': u'sha1$44a2055f5', 'username': u'DickCheney'} In [25]: hasattr(user, 'username') Out[25]: True In [26]: hasattr(User, 'username') Out[26]: False I'm having a weird bug where more attributes are showing up than I actually define. I want to conditionally stop this. e.g. if not hasattr(User, 'karma'): User.add_to_class('karma', models.PositiveIntegerField(default=1))

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• How to get all rows but specifc columns from a DataTable?

  - by Oliver

  Currently i am having some problems with getting some data out of a DataTable by selecting all rows, but only some columns. To be a little more descriptive here is a little example: Sample Data | ID | FirstName | LastName | Age | +----+-----------+----------+-----+ | 1 | Alice | Wannabe | 22 | | 2 | Bob | Consumer | 27 | | 3 | Carol | Detector | 25 | What i have So what we got from our GUI is a IEnumerable<DataColumn> selectedColumns and there we'll find two elements (FirstName and LastName). Now i need some result which contains all rows, but only the above two columns (or any other list of selected columns). So far i already used LINQ on several one dimensional objects, but this two dimensional object gives me a little headache. // The hard-coded way Table.AsEnumerable().Select(row => new { FirstName = row[1], LastName = row[2] }); // The flexible way Table.AsEnumerable().Select(row => row ???) But how can i now say, which columns from row should be selected by using my selectedColumns?

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• Python unit-testing with nose: Making sequential tests

  - by cool-RR

  I am just learning how to do unit-testing. I'm on Python / nose / Wing IDE. (The project that I'm writing tests for is a simulations framework, and among other things it lets you run simulations both synchronously and asynchronously, and the results of the simulation should be the same in both.) The thing is, I want some of my tests to use simulation results that were created in other tests. For example, synchronous_test calculates a certain simulation in synchronous mode, but then I want to calculate it in asynchronous mode, and check that the results came out the same. How do I structure this? Do I put them all in one test function, or make a separate asynchronous_test? Do I pass these objects from one test function to another? Also, keep in mind that all these tests will run through a test generator, so I can do the tests for each of the simulation packages included with my program.

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• Does JSON.js cause conflicts with Sys.Serialization.JavaScriptSerializer.serialize

  - by David Robbins

  I am using Telerik controls in my webforms and want to serialize object on the client. Since I am getting a stackoverflow error with Sys.Serialization.JavaScriptSerializer.deserialize I wanted to try JSON. With both JSON and and the MS library I get "Sys.Application is undefined." Has anyone encountered this what did you do as a work around? EDIT I am serializing my object on a parent page and passing them via an argument to a child window. The child window is in an IFRAME tag. The object can be used in the child page, but I receive the stackoverflow error when I serialize it. The object is an Array of objects.

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• SQL Server: Can INFORMATION_SCHEMA Tell Me When a SQL Object Was Created?

  - by Jim G.

  Given: I added a non-nullable foreign key to a table. I settled on a way to populate the foreign key with default values. I checked in both changes to a re-runnable DB creation script. Other developers ran this script, and now they have the foreign key populated with default values on their developer machines. A few days later however... I changed my mind. Now I'd like to populate the foreign key's default values differently. My Question: Can SQL Server or INFORMATION_SCHEMA tell me when SQL objects were created? Ideally, I'd like to drop and re-add the foreign key if it was created before a certain date/time. Any help or alternative strategies would be greatly appreciated. Obviously, I'd like to avoid going to each developer's cube, asking them to drop the foreign key manually.

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• How can I use data binding in WPF to create a new user control for each element in a list?

  - by Joel

  I have a list of objects. For each item in the list, I want to create a new user control bound to that item. From what I've read, doing this programmatically is bad practice with WPF (as well as less than straightforward), so I should use data binding as a solution instead. The problem is, I can't figure out how to do this. I don't know the contents of the list (just the type) at compile-time, so I can't create and bind with XAML for each element. Google and MSDN don't seem to have any answers, so maybe I'm thinking about this the wrong way? What do I need to do? Thanks

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• Avoiding EXC_BAD_ACCESS when using the delegate pattern

  - by Kenny Winker

  A have a view controller, and it creates a "downloader" object, which has a reference to the view controller (as a delegate). The downloader calls back the view controller if it successfully downloads the item. This works fine as long as you stay on the view, but if you navigate away before the download is complete I get EXC_BAD_ACCESS. I understand why this is happening, but is there any way to check if an object is still allocated? I tried to test using delegate != nil, and [delegate respondsToSelector:], but it chokes. if (!self.delegate || ![self.delegate respondsToSelector:@selector(downloadComplete:)]) { // delegate is gone, go away quietly [self autorelease]; return; } else { // delegate is still around [self.delegate downloadComplete:result]; } I know I could, a) have the downloader objects retain the view controller b) keep an array of downloaders in the view controller, and set their delegate values to nil when I deallocate the view controller. But I wonder if there is an easier way, where I just test if the delegate address contains a valid object?

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• Help me with a solution for what could be solutioned by virtual static fields... in FPC

  - by Gregory Smith

  Hi I'm doing an event manager in Freepascal Each event is an object type TEvent (=object), each kind of event must derive from this class. Events are differentiated by an integer identificator, assigned dynamically. The problem is that i want to retrieve the event id of an instance, and i can't do it well. All instances of a class(object) have a unique id = so it should be static field. All classes have a diferent id = so it should be virtual. Event ids are assignated in run time, and can change = so it can't be a simple method In sum, I can't put all this together. I'm looking for an elegant solution, i don't want to write a hardcoded table, actualizing it in every constructor... etc, i'd prefer something taking advantage of the polymorphism Can anyone help me with another technical or design solution? I remark I don't want to use class instead of object construct.(property doesn't work on objects? :(

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• A Scripting language for XNA

  - by RCIX

  I've written a game engine, which i want to integrate scripting into. However, i've looked at the available choices, which seem to be the following: Xnua Jint Managed Scripting The problems with those are (respectively): Built for XNA 1 -- there's an XNA 3.1 port but it's under the Apache license which i'm not sure is compatible with our goals (and it has a bit obtuse syntax) Appears to not properly use type-safe objects (e.g. ArrayList over generics) Is in beta, and only runs on XNA 3.0 So, to summarize my specific needs (in order of importance most to least): Needs to run on XNA 3.1 Needs to run on the XBox and Windows Should have a relatively simple API -- something closer to Jint's than Xnua's preferably uses Lua, C#, or similar languages Must be commercially sellable -- if some form of credit is needed, then that's fine. Are there any scripting solutions that meet my needs, or will i have to (eventually) roll my own?

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