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  • How to use IObservable/IObserver with ConcurrentQueue or ConcurrentStack

    - by James Black
    I realized that when I am trying to process items in a concurrent queue using multiple threads while multiple threads can be putting items into it, the ideal solution would be to use the Reactive Extensions with the Concurrent data structures. My original question is at: http://stackoverflow.com/questions/2997797/while-using-concurrentqueue-trying-to-dequeue-while-looping-through-in-parallel/ So I am curious if there is any way to have a LINQ (or PLINQ) query that will continuously be dequeueing as items are put into it. I am trying to get this to work in a way where I can have n number of producers pushing into the queue and a limited number of threads to process, so I don't overload the database. If I could use Rx framework then I expect that I could just start it, and if 100 items are placed in within 100ms, then the 20 threads that are part of the PLINQ query would just process through the queue. There are three technologies I am trying to work together: Rx Framework (Reactive LINQ) PLING System.Collections.Concurrent structures

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  • What's the best way to paginate a dataset with Zend_Framework and Doctrine?

    - by joedevon
    Before I start to build this myself I thought I'd ask others to share their experience. What's the best / your favorite way to paginate a dataset with an application built upon Zend_Framework and Doctrine as your ORM? I'm new to Doctrine. I'm calling the model directly from a View Helper, bypassing the Controller, although I'm still interested if your solution uses controllers. I did see one article on this topic: http://ciaranmcnulty.com/blog/2009/06/Simplify-pagination-logic-using-a-custom-zend-paginator-adapter Devzone has an article using Doctrine, Zend Framework OR Pear, but none of those options mention a #ZF app that uses Doctrine.

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  • Best Fit Scheduling Algorithim

    - by Teegijee
    I'm writing a scheduling program with a difficult programming problem. There are several events, each with multiple meeting times. I need to find an arrangement of meeting times such that each schedule contains any given event exactly once, using one of each event's multiple meeting times. Obviously I could use brute force, but that's rarely the best solution. I'm guessing this is a relatively basic computer science problem, which I'll learn about once I am able to start taking computer science classes. In the meantime, I'd prefer any links where I could read up on this, or even just a name I could Google.

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  • The benefits and hassles of moving entirely to a WPF Project

    - by Ben
    Hi, I have a project that i started as a WinForms application as that was the format i was confortable with at the time. I have since started dabbling in WPF an introduced some WPF UserControls (mainly grids) into my project and absolutely love them. The question i have is, is there any real advantage to me changing the UI Project of my solution into a purely WPF project, and get rid of any WinForms? I am fully aware that each format suits a certain environment, and you wouldnt be able to give a definitive answer without knowing more of the details, but i would like to know peoples opinions, and if anyone has done a silimar thing of converting an existing WinForms App into a WPF frontend, and any observations they made in doing so. Thanks

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  • Play a beep that loop and change the frequency/speed

    - by Bono
    Hi all, I am creating an iphone application that use audio. I want to play a beep sound that loop indefinitely. I found an easy way to do that using the upper layer AVAudioPlayer and the numberOfLoops set to "-1". It works fine. But now I want to play this audio and be able to change the rate / speed. It may works like the sound played by a car when approaching an obstacle. At the beginning the beep has a low frequency and this frequency accelerate till reaching a continuous sound biiiiiiiiiiiip ... It seems this is not feasible using the high layer AVAudioPlayer, but even looking at AudioToolBox I found no solution. Does anybody have informations about how to do that? Thanks a lot for helping me!

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  • How to organize Enterprise scale Composite Applications (CAG)

    - by David
    All QuickStarts and RI examples in the CAG documentation are good but I lack the more Enterprise scale examples. Let's say we have 40+ modules, each containing a Proxy,Facade,PresentationModel,Model and Views. Each module also makes calls to a Module-specific WCF service which is to be hosted in IIS or in a stand-alone console host. Our approach have been to include the UI-module, service-module and related tests into one solution so they can be developed and tested separately from other modules. My problem is how the hosting of the services should be done when the services are in separate modules and how to actually run the separate module together with the rest of the application-modules when I press F5. Is there a best practise for this? I guess it has been done before?

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  • How to store user preferences? Cookie becomes bigger..

    - by ari
    My application (Asp.Net MVC) has great interaction with the user interface (jQuery/js). For example, setting various searches charts, moving the gadgets on the screen and more .. I of course want to keep all data for each user. So that data will be available from any page in the Dumaine and the user will accepts his preferences. Now I keep all data in a cookie because it did not seem logical asynchronous access to the server each time the user changes something and thet happens a lot.When the user logout from the application I save the cookie to the database. The problem is the cookie becomes very large. The thought that this huge cookie is attached to each server request makes me feel that my attitude is wrong. Another problem cookies have size limit. It varies from your browser but I definitely have been close to the border - my cookie easily become 4kb Is there another solution?

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  • Transparent Background with a Modal UIViewController

    - by Mick Walker
    I have a dilema, I want to present to the user a semi-transparent view. I found out by experimenting that if I simply pushed the transparent view to the top of my NavigationController's stack, that it would not render the transparency level I wanted. So I decided to simply add the view as a subview of the current view at the top of the stack. This solution works, the view below is still visible, and the View is 'semi-modal'. The problem is, if the parent view inherits from UITableViewController (as mine does), then the view I 'push' onto it, does not cover the navigation bar at the top. I really don't want to get into a situation where I am forced to enable / disable controls on the navigation bar every time I push this view, so I was wondering, if anyone knew of any solutions that I could use so that the view I push onto the UITableViewController will actually 'push over' the navigation bar?

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  • Strong name a 3rd party Interop DLL

    - by mauro.dec
    Hello! I have a 3rd party library I need to use. this library however, is not signed, so I used Signer to strong name it. One of its dependencies is an Interop library (also provided by the 3rd party) which I cannot sign since it seems to have unmanaged code. At runtime, when the 3rd party code needs to load the Interop library it fails to do so for not being signed. In short, Is there a way for me to sign a 3rd party Interop DLL? I've done a lot of searching but still couldn't find a solution.

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  • Robustly killing Windows programs stuck reporting 'problems'

    - by grrussel
    I am looking for a means to kill a Windows exe program that, when being tested from a python script, crashes and presents a dialog to the user; as this program is invoked many times, and may crash repeatedly, this is not suitable. The problem dialog is the standard reporting of a Windows error: "Foo.exe has encountered a problem and needs to close. We are sorry for the inconvenience" and offers a Debug, Send Error Report, and Don't Send buttons. I am able to kill other forms of dialog resulting from crashes (e.g. a Debug build's assert failure dialog is OK.) I have tried taskkill.exe, pskill, and the terminate() function on the Popen object from the subprocess module that was used to invoke the .exe Has anyone encountered this specific issue, and found a resolution? I expect automating user input to select the window, and press the "Don't Send" button is one possible solution, but I would like something far simpler if possible

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  • UISegmentedControl register taps on selected segment

    - by Jongsma
    Hi, I have a segmented control where the user can select how to order a list. Works fine. However, I would like that when an already selected segment is tapped, the order gets inverted. I have all the code in place, but I don't know how to register the taps on those segments. It seems the only control event you can use is UIControlEventValueChanged, but that isn't working (since the selected segment isn't actually changing). Is there a solution for this? And if so, what is it? Thanks in advance!

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  • Dynamic/runtime method creation (code generation) in Python

    - by Eli Bendersky
    Hello, I need to generate code for a method at runtime. It's important to be able to run arbitrary code and have a docstring. I came up with a solution combining exec and setattr, here's a dummy example: class Viking(object): def __init__(self): code = ''' def dynamo(self, arg): """ dynamo's a dynamic method! """ self.weight += 1 return arg * self.weight ''' self.weight = 50 d = {} exec code.strip() in d setattr(self.__class__, 'dynamo', d['dynamo']) if __name__ == "__main__": v = Viking() print v.dynamo(10) print v.dynamo(10) print v.dynamo.__doc__ Is there a better / safer / more idiomatic way of achieving the same result?

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  • What's the best way to do cross browser testing?

    - by Doug
    What's the best way for me to check if my website is compatible in IE7,8, Safari, FF, and Chrome without having to install each and everyone? I mainly want to check the CSS, HTML, and JavaScript. Update I put a bounty in hopes there is a more practical solution for someone like myself. I am using Windows 7 Home Premium x64. Update2 I don't mind installing these browsers now, but I can't even if I wanted to. Windows 7 doesn't allow me to install IE7.

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  • How to Remove the Last Week Of a Calendar

    - by Nassign
    I am not sure why other people have not asked this before. But have you notice that the asp:Calendar shows an extra week at the end? For example if the VisibleMonth is set to 2010-03-01 and FirstDayOfWeek to Sunday: It will show 6 weeks. Feb 28 to March 6 March 7 to March 13 March 14 to March 20 March 21 to March 27 March 28 to April 3 April 4 to April 10 I was wondering why Microsoft shows the last Row which is entirely on April. I tried to search the net for a property but it does not seem to be existing. The only solution that I could think of is to override the Pre_Render and check all individual date if they are still within the week of the VisibleDate. But of course that is an extreme checking since each rendering of the control shows it.

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  • Android Release Version and "Waiting for Debugger"

    - by Tom Richards
    I know this has been asked before but I still don't have a solution. My first app: developed and debugged on my moto droid and then followed all the release steps, (exported from Eclipse, using my key to sign) including removing the debug in the manifest xml. I copied the resulting apk to the droid, disconnected the usb and installed it by double clicking on the file using Astro. I get the "Waiting for Debugger" message like when I am debugging but it never goes away. Doing something real stupid I know but I can't figure it out. Any help would be appreciated. Thanks, Tom

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  • jQuery UI Dialog cause page jump on open & close on ASP.NET

    - by Gal V
    Hello all, I have an ASP.NET C# page, with image thumbnails in it. I created a script that opens a jQuery UI Dialog on each hover on a thumbnail that shows me the thumbnail in larger size in a dialog view, and when I hover out - dialog closes. My little annoying problem is, that in every mouseover (trigger dialog to open) - the page makes itself 'longer' - a scrollbar appears on the side of the browser, and it seems like the page gets longer when a dialog is openning, but it shouldn't do so. When I hover off (mouseout) - the dialog disappears and the page returns to its normal state. Because of this- when I hover through the thumbnails, my page 'jumps'. I looked for a solution for this, and I've added return false; for each dialog open, and close - and it still doesn't make any different. Sorry for the unperfect english, and thanks for all helpers!

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  • How to set AeDebug to get a minidump with the name of the process ?

    - by JC Martin
    I have to perform some post mortem debugging on a C++ project. Known way to perform is to set the cdb debugger as a minidump generator and to process the dumps collects afterwards. I read nearly the whole web and I didn't find a solution to produce a minidump with the name of the process that has crashed Is there a way to set AeDebug\Debugger registry variable in such a manner that cdb generates a dump file with the name of the process ? When I encapsulate the call to cdb.exe in a batch file, it starts well but stays blocked on the symbol searching. I must perform a Ctrl+C in order to stop the batch, then the minidump, with the correct process name, is created... but of course I can't set up such a thing in an unattended production environment... Has anybody done that before ?

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  • High density Silverlight charting control

    - by ahosie
    I've been looking into Silverlight charting controls to display a large number of samples, (~10,000 data points in five separate series - ~50k points all up). I have found the existing options produced by Dundas, Visifire, Microsoft etc to be extremely poor performers when displaying more than a few hundred data points. I believe the performance issues with existing chart controls is caused by the heavy use of vector graphics. Ergo one solution would be a client-side chart control that uses the WritableBitmap class to generate a raster chart. Before I fall too far down the wheel re-invention rabbit hole - has anyone found a third party or OSS control that will manage large numbers of data points on a sparkline?

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  • Bad interpreter: No such file or directory

    - by user1497462
    I'm working through Michael Hartl's tutorial trying to learn Rails for the first time, and I've run into some issues. I recently reinstalled the whole Rails Installer because I had apparently inadvertently deleted some important files. Now, when I try running a test I get the following error: sh.exe": /c/Program Files (x86)/ruby-1.9.3/bin/bundle: "c:/Program: bad interpre ter: No such file or directory I checked my PATH and attempted to use the solution outlined here: Bundle command not found. Bad Interpreter ..but putting quotation marks around "C:\Program Files (x86)\ruby-1.9.3\bin" didn't do anything for me. I ran $ rails -v and got the following output: $ rails -v ?[31mCould not find multi_json-1.3.6 in any of the sources?[0m ?[33mRun `bundle install` to install missing gems.?[0m So then I tried running $bundle install and got the following issue again: Tom@TOM-PC /c/sample_app (updating-users) $ bundle install sh.exe": /c/Program Files (x86)/ruby-1.9.3/bin/bundle: "c:/Program: bad interpre ter: No such file or directory I'd really appreciate any help -- I've spent 5+ hours today trying to get back on track and am still at a loss. Thanks!

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  • Simple, non-blocking way to sleep?

    - by OverTheRainbow
    Hello I googled for this and read some threads here, but I haven't found a simple way to have a VB.Net application sleep for a little while and still keep the application responsive: Imports System.Net Imports System.IO Imports System.Text Imports System.Text.RegularExpressions Imports System.Threading.Thread [...] 'How to keep screen frop freezing? While True ListBox1.Items.Clear() ListBox1.Items.Add("blah") 'Not much difference ListBox1.Refresh() 'Wait 1mn Sleep(60000) End While Is there really no simple, non-blocking solution to have a VB.Net application wait for a few seconds? Thank you.

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  • Join Query returns empty result, unexpected result

    - by Abs
    Hello all, Can anyone explain why this query returns an empty result. SELECT * FROM (`bookmarks`) JOIN `tags` ON `tags`.`bookmark_id` = `bookmarks`.`id` WHERE `tag` = 'clean' AND `tag` = 'simple' In my bookmarks table, I have a bookmark with an id of 70 and in my tags table i have two tags 'clean' and 'simple' both that have the column bookmark_id as 70. I would of thought a result would have been returned? How can I remedy this so that I have the bookmark returned when it has a tag of 'clean' and 'simple'? Thanks all for any explanation and solution to this.

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  • Remove a keyboard shortcut binding in Visual Studio using Macros

    - by Pete
    Hi. I have a lot of custom keyboard shortcuts set up. To avoid having to set them up every time I install a new visual studio (happens quite a lot currectly, with VS2010 being in beta/RC) I have created a macro, that sets up all my custom commands, like this: DTE.Commands.Item("ReSharper.ReSharper_UnitTest_RunSolution").Bindings = "Global::Ctrl+T, Ctrl+A" My main problem is that Ctrl+T is set up to map to the transpose char command by default. So I want to remove that default value in my macro. I have tried the following two lines, but both throw an exception DTE.Commands.Item("Edit.CharTranspose").Bindings = "" DTE.Commands.Item("Edit.CharTranspose").Bindings = Nothing Although they kind of work, because they actually remove the binding ;) But I would prefer the solution that doesn't throw an exception. How is that done?

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  • MSBuild - setting a reference path

    - by Ryan
    I have several assemblies my project is dependant upon. These are stored in the Project's directory under the "Dependencies" folder. So something like this. Solution - Project - Dependancies FunkyAssembly.dll - bin - Debug - Release SomeCode.cs I've referenced FunkyAssembly.dll using Browse and in project.csproj I see <Reference Include="FunkyAssembly"> <HintPath>Dependancies\FunkyAssembly.dll</HintPath> </Reference> So far so good - except after a release build FunkyAssembly.dll is copied to the Release directory (not a problem in itself) but then future debug builds will reference this copy rather than the copy in Dependencies. You can see this if you at Path in the reference properties. This means that if Dependencies\FunkyAssembly.dll is updated the build won't pick it up as its referencing the old copy in bin/Release. Any way to FORCE the damn thing to pick up Dependencies\FunkyAssembly.dll rather than HINT?

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  • Determining actual args an Excel UDF was called with.

    - by Frederick
    I'm adding a user defined function to Excel with varargs-based signature in C++: XLFUNCTIONIMP(MyFunction)(...); When Excel calls MyFunction, it passes it 30 arguments regardless of how many the user entered in the sheet. The extraneous ones are blank strings. MyFunction, however, is designed to accept empty string arguments. As a result, I cannot tell valid empty strings apart from the extraneous ones sent by Excel. A solution could be to obtain the contents of the actual cell where the user entered the function. However, I can't find a way of doing that from within the implementation of my function. Could someone please suggest a way out?

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  • SQL Server 2005 script with join across Database Servers

    - by Robin Day
    I have the following script which I use to give me a simple "diff" between tables on two different databases. (Note: In reality my comparison is on a lot more than just an ID) SELECT MyTableA.MyId, MyTableB.MyId FROM MyDataBaseA..MyTable MyTableA FULL OUTER JOIN MyDataBaseB..MyTable MyTableB ON MyTableA.MyId = MyTableB.MyId WHERE MyTableA.MyId IS NULL OR MyTableB.MyId IS NULL I now need to run this script on two databases that exist on different servers. At the moment my solution is to backup the database from one server, restore it to the other and then run the script. I'm pretty sure this is possible, however, is this likely to be a can of worms? This is a very rare task I need to perform and if it involves a large number of DB setting changes then I will probably stick to my backup method.

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