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  • what libraries or platforms should I use to build web apps that provide real-time, asynchronous data

    - by Daniel Sterling
    This is a less a question with a simple, practical answer and more a question to foster discussion on the real-time data exchange topic. I'll begin with an example: Google Wave is, at its core, a real-time asynchronous data synchronization engine. Wave supports (or plans to support) concurrent (real-time) document collaboration, disconnected (offline) document editing, conflict resolution, document history and playback with attribution, and server federation. A core part of Wave is the Operational Transformation engine: http://www.waveprotocol.org/whitepapers/operational-transform The OT engine manages document state. Changes between clients are merged and each client has a sane and consistent view of the document at all times; the final document is eventually consistent between all connected clients. My question is: is this system abstract or general enough to be used as a library or generic framework upon which to build web apps that synchronize real-time, asynchronous state in each client? Is the Wave protocol directly used by any current web applications (besides Google's client)? Would it make sense to directly use it for generic state synchronization in a web app? What other existing libraries or frameworks would you consider using when building such a web app? How much code in such an app might be domain-specific logic vs generic state synchronization logic? Or, put another way, how leaky might the state synchronization abstractions be? Comments and discussion welcomed!

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  • Have a link that is imported in xml, clickable to execute a function

    - by Benjamin Sterling
    Ok, here's the question, I have an xml doc that is being import into an AS3 file and then with .htmlText, appending it to a movie clip. An example of what this looks like is: <abstract><![CDATA[<p><strong>AEO Times Square</strong> Store Wins Prestigious SEGD Merit Award for Dynamic Environments <a href='event:OpenArticle1'>View Article</a></p>]]></abstract> What I'd like to have happen is when I click that view article link that I can call a function passing in "OpenArticle1". Thanks in advance.

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  • Dialog created after first becomes unresponsive unless created first?

    - by Justin Sterling
    After creating the initial dialog box that works perfectly fine, I create another dialog box when the Join Game button is pressed. The dialog box is created and show successfully, however I am unable to type in the edit box or even press or exit the dialog. Does anyone understand how to fix this or why it happens? I made sure the dialog box itself was not the problem by creating and displaying it from the main loop in the application. It worked fine when I created it that way. So why does it error when being created from another dialog? My code is below. This code is for the DLGPROC function that each dialog uses. #define WIN32_LEAN_AND_MEAN #include "Windows.h" #include ".\Controllers\Menu\MenuSystem.h" #include ".\Controllers\Game Controller\GameManager.h" #include ".\Controllers\Network\Network.h" #include "resource.h" #include "main.h" using namespace std; extern GameManager g; extern bool men; NET_Socket server; extern HWND d; HWND joinDlg; char ip[64]; void JoinMenu(){ joinDlg = CreateDialog(g_hInstance, MAKEINTRESOURCE(IDD_GETADDRESSINFO), NULL, (DLGPROC)GameJoinDialogPrompt); SetFocus(joinDlg); // ShowWindow(joinDlg, SW_SHOW); ShowWindow(d, SW_HIDE); } LRESULT CALLBACK GameJoinDialogPrompt(HWND Dialogwindow, UINT Message, WPARAM wParam, LPARAM lParam){ switch(Message){ case WM_COMMAND:{ switch(LOWORD(wParam)){ case IDCONNECT:{ GetDlgItemText(joinDlg, IDC_IP, ip, 63); if(server.ConnectToServer(ip, 7890, NET_UDP) == NET_INVALID_SOCKET){ LogString("Failed to connect to server! IP: %s", ip); MessageBox(NULL, "Failed to connect!", "Error", MB_OK); ShowWindow(joinDlg, SW_SHOW); break; }   } LogString("Connected!"); break; case IDCANCEL: ShowWindow(d, SW_SHOW); ShowWindow(joinDlg, SW_HIDE); break; } break; } case WM_CLOSE: PostQuitMessage(0); break; } return 0; } LRESULT CALLBACK GameMainDialogPrompt(HWND Dialogwindow, UINT Message, WPARAM wParam, LPARAM lParam){ switch(Message){ case WM_PAINT:{ PAINTSTRUCT ps; RECT rect; HDC hdc = GetDC(Dialogwindow);    hdc = BeginPaint(Dialogwindow, &ps); GetClientRect (Dialogwindow, &rect); FillRect(hdc, &rect, CreateSolidBrush(RGB(0, 0, 0)));    EndPaint(Dialogwindow, &ps);    break;  } case WM_COMMAND:{ switch(LOWORD(wParam)){ case IDC_HOST: if(!NET_Initialize()){ break; } if(server.CreateServer(7890, NET_UDP) != 0){ MessageBox(NULL, "Failed to create server.", "Error!", MB_OK); PostQuitMessage(0); return -1; } ShowWindow(d, SW_HIDE); break; case IDC_JOIN:{ JoinMenu(); } break; case IDC_EXIT: PostQuitMessage(0); break; default: break; } break; } return 0; } } I call the first dialog using the below code void EnterMenu(){ // joinDlg = CreateDialog(g_hInstance, MAKEINTRESOURCE(IDD_GETADDRESSINFO), g_hWnd, (DLGPROC)GameJoinDialogPrompt);// d = CreateDialog(g_hInstance, MAKEINTRESOURCE(IDD_SELECTMENU), g_hWnd, (DLGPROC)GameMainDialogPrompt); } The dialog boxes are not DISABLED by default, and they are visible by default. Everything is set to be active on creation and no code deactivates the items on the dialog or the dialog itself.

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  • Retain cycle on `self` with blocks

    - by Jonathan Sterling
    I'm afraid this question is pretty basic, but I think it's relevant to a lot of Objective-C programmers who are getting into blocks. What I've heard is that since blocks capture local variables referenced within them as const copies, using self within a block can result in a retain cycle, should that block be copied. So, we are supposed to use __block to force the block to deal directly with self instead of having it copied. __block typeof(self) bself = self; [someObject messageWithBlock:^{ [bself doSomething]; }]; instead of just [someObject messageWithBlock:^{ [self doSomething]; }]; What I'd like to know is the following: if this is true, is there a way that I can avoid the ugliness (aside from using GC)?

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  • TXT File or Database?

    - by Ruth Rettigo
    Hey folks! What should I use in this case (Apache + PHP)? Database or just a TXT file? My priority #1 is speed. Operations Adding new items Reading items Max. 1 000 records Thank you. Database (MySQL) +----------+-----+ | Name | Age | +----------+-----+ | Joshua | 32 | | Thomas | 21 | | James | 34 | | Daniel | 12 | +----------+-----+ TXT file Joshua 32 Thomas 21 James 34 Daniel 12

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  • create parent child array from inline data in php

    - by abhie
    actually i have simple problem but i forget how to solve it.. :D i have data on table with following format 01 Johson 01 Craig 01 Johson 02 Daniel 01 Johson 03 Abbey 02 Dawson 01 Brown 02 Dawson 02 Agust 03 Brick 01 Chev 03 Brick 01 Flinch so i want it to become an array like this 01 Johson => 01 Craig ``````````````02 Daniel ```````````````03 Abey ` etc... how to iterate trough the data and make it array like that... i'm newby in PHP :))

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  • WCF Binding Created In Code

    - by Daniel
    Hello I've a must to create wcf service with parameter. I'm following this http://social.msdn.microsoft.com/Forums/en-US/wcf/thread/8f18aed8-8e34-48ea-b8be-6c29ac3b4f41 First this is that I don't know how can I set this custom behavior "MyServiceBehavior" in my Web.config in ASP.NET MVC app that will host it. As far as I know behaviors must be declared in section in wcf.config. How can I add reference there to my behavior class from service assembly? An second thing is that I the following example the create local host, but how I can add headers used in constructor when I use service reference and it will already create instance of web service, right? Regards, Daniel Skowronski

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  • android memory management outside heap

    - by Daniel Benedykt
    Hi I am working on an application for android and we since we have lots of graphics, we use a lot of memory. I monitor the memory heap size and its about 3-4 Mb , and peeks of 5Mb when I do something that requires more memory (and then goes back to 3). This is not a big deal, but some other stuff is handled outside the heap memory, like loading of drawables. For example if I run the ddms tool outside eclipse, and go to sysinfo, I see that my app is taking 20Mb on the Droid and 12 on the G1, but heap size are the same in both, because data is the same but images are different. So the questions are: How do I know what is taking the memory outside the heap memory? What other stuff takes memory outside the heap memory? Complex layouts (big tree) ? Animations? Thanks Daniel

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  • Delphi: Get MAC of Router

    - by Daniel Marschall
    Hello, I am using Delphi and I want to determinate the physical MAC address of a network device in my network, in this case the Router itself. My code: var idsnmp: tidsnmp; val:string; begin idsnmp := tidsnmp.create; try idsnmp.QuickSend('.1.3.6.1.2.1.4.22.1.2', 'public', '10.0.0.1', val); showmessage(val); finally idsnmp.free; end; end; where 10.0.0.1 is my router. Alas, QuickSend does always send "Connection reset by peer #10054". I tried to modify the MIB-OID and I also tried the IP 127.0.0.1 which connection should never fail. I did not find any useable Tutorials about TIdSNMP at Google. :-( Regards Daniel Marschall

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  • CakePHP: 2-level JOIN with one Query

    - by Daniel Magliola
    I have the following models in CakePHP: A Deposit belongs to an Account An Account belongs to a Customer I want to have a list of Deposits, and I need to show the name of the customer (so I have to join through the Customer). I also need to paginate this list. If I set Deposit->recursive = 2, I can get the Customer, however, CakePHP runs one query joining Deposit and Account, and then runs one query per each Deposit, to get the Customer. How can I make it get both models with only one query? I tried this, but it didn't work: $this->paginate = array('joins' => array( array( 'table' => 'customers', 'alias' => 'AccountCustomer', 'type' => 'inner', 'foreignKey' => false, 'conditions' => array('Account.customer_id = AccountCustomer.id') ) )); Any ideas? Thanks! Daniel

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  • Exception from HRESULT: 0x800A03EC

    - by Daniel
    Any help is appreciated: I'm developing a C#.Net app in VS2010 that interacts with Excel. The app works correctly on my local machine. Uploading to a remote Windows 2003 server however, breaks the app. Originally, I received the following message Retrieving the COM class factory for component with CLSID {00024500-0000-0000-C000-000000000046} failed due to the following error: 80070005 After Googling the problem (which suggested a permissions problem) i tried this: Installing Excel 2007 Going into Component Services on the remote server and following the instructions here: http://blog.crowe.co.nz/archive/2006/03/02/589.aspx Now I get this message on the same operation: Exception from HRESULT: 0x800A03EC Google searches seem to be suggesting that this is a version match error. However, both the local machine and the remote server use Excel 2007. Any suggestions would be very welcome. Thanks in advance. -Daniel

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  • Visual Studio 2010 Full and ASP.NET MVC 2.0 Template

    - by Daniel
    Hello, I've installed full version (not RC nor Beta) of Visual Studio 2010, a then setup within Web Platform Installer 2.0 announce me that I need to install MVC 2.0, so i did it. When I want to create project "MvcWebApplicationProjectTemplate" in VS I have following message: error: this template attempted to load component assembly 'Microsoft.VisualStudio.Web.Mvc.2.0, Version=10.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35'. For more information on this problem and how to enable this template, please see documentation on Customizing Project Templates. Any idea how to fix it? Do you think that Web Platform Installer 2.0 might have corrupted this template? Thanks, Daniel

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  • WCF - Disabling security in nettcpbinding (c#)

    - by daniel-lacayo
    Hello everyone. I'm trying to make a self hosted WCF app that uses nettcpbinding but works in an environment without a domain. It's just two regular windows pc's, one is the server and the other one will be the client. The problem with this is that when I try to get the client to connect it's rejected because of the security settings. Can you please point me in the right direction as to how I can get this scenario to work? Should I (if possible) disable security? Is there another (hopefully simple) way to accomplish this? Regards, Daniel

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  • MySQL to AppEngine

    - by Daniel Naito
    Hi Nick! How are you? I'm from Brazil and study at FATEC (college located in Brazil). I'm trying to learn about AppEngine. Now, I'm trying to load a large database from MySQL to AppEngine to perform some queries, but I don't know how i can do it. I did some testing with CSV files,but is there any way to perform the direct import from MySQL? This database is from Pentaho BI Server (www.pentaho.com). Thank you for your attention. Regards, Daniel Naito

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  • Configurable ruby logger setup: Logger.new().level = variable

    - by Daniel
    Hi, I want to change the logging level of an application (ruby). require 'logger' config = { :level => 'Logger::WARN' } log = Logger.new STDOUT log.level = Kernel.const_get config[:level] Well, the irb wasn't happy with that and threw "NameError: wrong constant name Logger::WARN" in my face. Ugh! I was insulted. I could do this in a case/when to solve this, or do log.level = 1, but there must be a more elegant way! Does anyone have any ideas? -daniel

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  • Master / Detail datagridview with relation from type string in C#

    - by Daniel
    Hello, I want to show a master / detail relationship using two datagridviews and DataRelation in C#. The relation between the master and the detail table is an ID from type string (and there is no chance to change the ID to type integer). It seems like the DataGridView is not able to update the detail view when changing the row in the master table. Does anybody know if it is possible to achieve a master / detail view using a string ID and if yes, how? Or do I have to use an external DataGrid from another company? Thanks for any help Daniel

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  • Surgical slave reads for Ruby on Rails, mulitple databases.

    - by Daniel
    Greetings, I'm currently working on a multiple database rails application. I want to off load the SELECT queries on to the slave databases for only SOME of the databases or specific models. The issue is that in places, we swap out the current database connection and put in a different one for a short time; to load fixtures or to handle sharding. Does anyone have any recommendations on a ruby gem that 1. will split select/(sql writes) with a considerable amount of control. We want to handle just some models and we are looking for a neat surgical fix. 2. does not monkey around with activerecord. 3. is still being maintained. TIA -daniel

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  • Why did this work? ( php dot notation )

    - by Daniel
    Hi, I was writing some php code after a long sint doing ruby and I accidently wrote this: [root@ip-10-160-47-98 test]# cat run.php <?php class MyTest { public function run() { var_dump(this.test); } } $object = new MyTest(); $object->run(); [root@ip-10-160-47-98 test]# php run.php string(8) "thistest" [root@ip-10-160-47-98 test]# Now, this.test should have been $this-test, but the compiler was actually happy to let this run. Does anyone know how (this.test) got converted into a string "thistest"? Compiled and run on php 5.3.2 amazon instance ami-e32273a6 (CentOS 5.4) -daniel

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  • Can I get a dump of all my databases *except one* using mysqldump?

    - by Daniel Magliola
    I'm currently using mySQLdump to backup my dev machine and servers. There is one project I just started, however, that has a HUUUUUGE database that I don't really need backed up, and i'll be a big problem to add it to the rest of the backup cycle. I'm currently doing this: "c:\Program Files\mysql\MySQL Server 5.1\bin\mysqldump" -u root -pxxxxxx --all-databases g:\backups\MySQL\mysqlbackup.sql Is it possible to somehow specify "except this database(s)"? I wouldn't like to have to specify the list of DBs manually, since that would mean that I'd have to remember updating my backup batch file every time I create a new DB, and I know that's not gonna happen. EDIT: As you probably guessed from my command line above, i'm doing this on Windows, so I can't do any kind of fancy bash stuff, only wimpy .bat things. Alternatively, if you have other ideas to solve this same issue, they are more than welcome, of course! Thanks Daniel

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  • From interpeted to native code: "dynamic" languages compiler support

    - by Daniel
    First, I am aware that dynamic languages is a term used mainly by a vendor; I am using it just to have a container word to include languages like Perl (a favorite of mine), Python, Tcl, Ruby, PHP and so on. They are interpreted but I am interested here to refer to languages featuring strong capability to support the programmer efficiency and the support for typical constructs of modern interpreted languages My question is: there are dynamic languages can be compiled efficiently in native executable code - typically for Windows platforms? Which ones? Maybe using some third part ad-hoc tools? I am not talking about huge executables carrying with them a full interpreter or some similar tricks nor some smart module able to include its own dependances or some required modules, but a honest, straight, standard, solid executable code. If not, there is some technical reason inhibiting the availability of such a best-of-both-world feature? Thanks! Daniel

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  • How can I split a PHP form into two sections, before submission to a database?

    - by Daniel Smith
    Hi guys, I have set up a PHP form for a competition, for users to enter and all information to be stored in a database. I used the following NetTut+ tutorial to do so: http://tr.im/SwAd. I've got the form submitting to the database as required, but with so many additional questions being asked, I would like to split the form into two separate sections. Obviously the first page would say continue to the next step before the second step allowing for the form to be submitted to the database. The content that the user sees should be split, but should all be a part of the same form. Step 1 Step 2 before submission. Would anyone know of or recommend any methods to do this? I'm a beginner so please be nice. :) Cheers, Daniel

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  • memory of drawables, is it better to have resources inside APK, outside APK or is it the same for me

    - by Daniel Benedykt
    Hi I have an application that draws a lot of graphics and change them. Since I have many graphics, I thought of having the images outside the APK, downloaded from the internet as needed, and saved on the files application folder. But I started to get outOfMemory exceptions. The question is: Does android handle memory different if I load a graphic from APK than if I load it from 'disk'? code using APK: topView.setBackgroundResource(R.drawable.bg); code if image is outside APK: Drawable d = Drawable.createFromPath(pathName); topView.setBackgroundDrawable(d); Thanks Daniel

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  • Shall i learn Assembly Language or C, to Understand how "real programming" works?

    - by Daniel Upton
    Hello, World.. I'm a web developer mostly working in Ruby and C#.. I wanna learn a low level language so i dont look like an ass infront of my (computer science expert) boss. Ive heard a lot of purist buzz about how assembly language is the only way to learn how computers actually work, but on the other hand C would probably be more useful as a language rather than just for theory. So my question is.. Would Learning C teach me enough computer science theory / low level programming to not look like a common dandy (complete tool)? Thanks! Daniel

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