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• 502 errors with apache mod_proxy hot standby (or equivalent)

  - by 6million

  Anyone knows how to configure the hot standby (+H) mod_proxy feature so that the takeover occurs immediately (without even one user receiving a 502) error during a shutdown? We aren't looking for real load-balancing, we just want a secondary server to take over while we shutdown the primary. The problem is that whenever the primary goes down, I'm able to slip one invalid request resulting in a 502 HTTP error reaching the end user,before the secondary actually takes over. Listen 80 <VirtualHost 127.0.0.1:80> ServerName domain.com ProxyPass / balancer://balance/ <Proxy balancer://balance/> BalancerMember http://primary_ip:80 BalancerMember http://secondary_ip:80 status=+H </Proxy> </VirtualHost>

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• How to load chunks of 2d map segments when player reaches a certain point?

  - by 2kan

  In my 2d platformer (made with Java and Slick2d), random maps are made by combining different segments together and displaying them one after the other. My problem is that I can't load too many segments or the game will run out of memory, so I want to load n number of segments at a time in chunks, then load the next chunk when the player comes near the end of one. I've attempted to do this for a couple of hours now, but I just can't get it to work at all. This is my chunk generation function where chunkLoad is the number of segments to load and BLOCK_WIDTH is the number of blocks/tiles each segment is across. Chunk1 and map are arrays of segments. Random r = new Random(); for(int i=0; i<chunkLoad; i++) { int id = r.nextInt(4)+2; chunk1[i] = new BlockMap("res/window/map"+id+".tmx", i*BLOCK_WIDTH); } map = chunk1; chunksLoaded++; The map is then drawn on the screen like this. tmap is a TiledMap object and each block/tile is 16 pixels wide for(int i=0; i<chunkLoad; i++) { map[i].tmap.render((i * BLOCK_WIDTH * 16) + (cameraX), 0); } I can successfully load new chunks, but I can't display them in the correct position, nor the hitboxes. Any suggestions? Thanks.

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• How to choose NoSQL database engine?

  - by Poma

  We have a database with following specs: 30k records, 7mb in size 20 inserts/second 1000 updates/second 1000 range selects/second, by secondary index, approx 10 rows each needs at least one secondary index needs some mechanism to expire keys if they are not updated for 75 secs (can be done via programmatic garbage collector but will require additional 'last_update' index and will add some load) consistency is not required durability is not required db should be stored in memory For now we use Redis, but it does not have secondary index and it's keys index:foo:* is too slow. Membase also does not have secondary index (as far as I know). MongoDB and MySQL memory engine have table-level locks. What engine will fit our use case?

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• MVVM load data during or after ViewModel construction?

  - by mkmurray

  My generic question is as the title states, is it best to load data during ViewModel construction or afterward through some Loaded event handling? I'm guessing the answer is after construction via some Loaded event handling, but I'm wondering how that is most cleanly coordinated between ViewModel and View? Here's more details about my situation and the particular problem I'm trying to solve: I am using the MVVM Light framework as well as Unity for DI. I have some nested Views, each bound to a corresponding ViewModel. The ViewModels are bound to each View's root control DataContext via the ViewModelLocator idea that Laurent Bugnion has put into MVVM Light. This allows for finding ViewModels via a static resource and for controlling the lifetime of ViewModels via a Dependency Injection framework, in this case Unity. It also allows for Expression Blend to see everything in regard to ViewModels and how to bind them. So anyway, I've got a parent View that has a ComboBox databound to an ObservableCollection in its ViewModel. The ComboBox's SelectedItem is also bound (two-way) to a property on the ViewModel. When the selection of the ComboBox changes, this is to trigger updates in other views and subviews. Currently I am accomplishing this via the Messaging system that is found in MVVM Light. This is all working great and as expected when you choose different items in the ComboBox. However, the ViewModel is getting its data during construction time via a series of initializing method calls. This seems to only be a problem if I want to control what the initial SelectedItem of the ComboBox is. Using MVVM Light's messaging system, I currently have it set up where the setter of the ViewModel's SelectedItem property is the one broadcasting the update and the other interested ViewModels register for the message in their constructors. It appears I am currently trying to set the SelectedItem via the ViewModel at construction time, which hasn't allowed sub-ViewModels to be constructed and register yet. What would be the cleanest way to coordinate the data load and initial setting of SelectedItem within the ViewModel? I really want to stick with putting as little in the View's code-behind as is reasonable. I think I just need a way for the ViewModel to know when stuff has Loaded and that it can then continue to load the data and finalize the setup phase. Thanks in advance for your responses.

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• Rendering WPF DrawingGroup to single ImageSource

  - by Xander

  Currently I'm using a System.Windows.Media.DrawingGroup to store some tiled images (ImageDrawing) inside the Children-DrawingCollection property. Well the problem is now, this method gets really slow if you display the entire DrawingGroup in an Image control, because my DrawingGroup can contain hundreds or even thousands of small images it can really mess up the performance. So my first thought was to somehow render a single image from all the small ones inside the DrawingGroup and then only display that image, that would be much faster. But as you might have figured out I haven't found any solution so simply combine several images with WPF Imaging. It would really be great if someone could help with this problem or tell me how i can improve the performance with the DrawingGroup or even use another approach. One last thing, currently I'm using a RenderTargetBitmap to generate a single BitmapSource from the DrawingGroup, this approach isn't really faster, but it makes the scrolling and working on the Image control at least a little smoother.

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• jQuery .load() not working in Chrome

  - by Skilldrick

  .load() was working fine, but for some reason it's not in Chrome now (presumably some kind of update). I'm on Chrome 5.0.375.55. I've isolated the problem to this: index.htm <html> <head> <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.3.2/jquery.min.js"></script> <script type="text/javascript"> $(document).ready(function () { $('#reader').load('test.htm'); }); </script> </head> <body> <div id='reader'>Loading ...</div> </body> </html> test.htm <h1>Loaded successfully</h1> This works on Firefox and IE, but on Chrome it replaces the contents of the #reader div with nothing.

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• ASP.NET + jQuery UI Modal: load aspx page into modal dialog

  - by kilonet

  I need to load aspx page into jQuery UI's modal dialog window. I used following approach: load page content via ajax call into dialog's div and show it: $.get('Page.aspx', function(response){ $('#dialog').html(response); $("#dialog").dialog('open'); }); but I've got very strange error (IE8) in line 137215738 (!): 'theForm.elements.length' - is null or not an object. JS debbuger says that source code is not available for such location. I have an assumption that this error happens because of multiple 'form' tags that appears on page after ajax call I wonder, how can i fix this? Or maybe some other way of showing aspx page in modal dialog?

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• No such file to load bundler error for Rails 3

  - by kgpdeveloper

  I have a Rails 3 app ready for staging. I haven't got a VPS host set up yet. As I was planning to have everything on shared host for the first few months. Problem: cd myapp bundle check result: The Gemfile's dependencies are satisfied Passenger error: Error message: no such file to load -- bundler Exception class: LoadError Frustrating thing about shared hosts is that I have to add these lines on config.ru: ENV['GEM_HOME'] = '/home/username/.gems' ENV['GEM_PATH'] = '$GEM_HOME:/usr/lib/ruby/gems/1.8' Still no luck. Same no such file to load bundler error appears. Has anybody got this working? Rails 3, Debian, shared host (dreamhost)? I could just go ahead and register on Slicehost/Fivebean but before I do, I'd like to know why that error is showing up. Thanks.

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• Warping Images using cvWarpPerspective Results in Some Parts of the images out of the viewable area

  - by Birkan Cilingir

  Hi, I am trying to stich two images together. In order to do so I extracted sift features and find matches on the two images using this C implementation. http://web.engr.oregonstate.edu/~hess/index.html After that I found the homography matrix using the matched points. http://www.ics.forth.gr/~lourakis/homest/ But if I use this Homography Matrix in "cvWarpPerspective" function, some of the parts of the image goes out of the viewable area (negative corrdinates). To solve this I tried to calculate the bounding box first by piping the four corners of the image through Homography matrix. And move the initial image then warp it. But this caused the warping result to change. Is there any way for warping an image and keeping it in the viewable area? I would appreciate any help. Thanks in advance...

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• Android "Hello, MapView" Tutorial - Map Tiles Do Not Load

  - by Onyx

  I am new to Android software development and new to this site. I am hoping someone might have some experience with the problem I am having. I've been following the Hello, MapView tutorial in order to not only learn the Android framework, but also the Google Maps library. I've tried my best to implement things exactly as the tutorial has instructed. My problem is that the application does load in my emulator (or even on my phone for that matter), but the map tiles do not load. Searching Google I found a post by someone else on another site having the same issue, but his/her problem was that the important elements added to the AndroidManifest.xml file were not in the right order. I double-checked this in mine, but everything seems to be right. So, I am not sure what the issue is and was hoping others have seen this before. I can provide any snippets of code, if that would help. Thank you.

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• load directx xfile in xaml/wpf

  - by keith

  How can I load a .x file in xaml/wpf?

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• ASP.NET MVC Strongly Typed Partial View, gives could not load type error

  - by Matt

  I am attempting to create a strongly typed view with a "MVC View User Control" that is being rendered using Html.RenderPartial(). The top of my ascx file looks like this: <%@ Control Language="C#" Inherits="System.Web.Mvc.ViewUserControl<System.Collections.IEnumerable<string>>" %> There is nothing else on this page, currently. When I execute the app and load the page that renders this control, I get the following error: Could not load type 'System.Web.Mvc.ViewUserControl<System.Collections.IEnumerable<string>>'. So, then I simplified it: <%@ Control Language="C#" Inherits="System.Web.Mvc.ViewUserControl<String>" %> And then, just in case it needed to be fully qualified: <%@ Control Language="C#" Inherits="System.Web.Mvc.ViewUserControl<System.String>" %> Everytime I get the same error (substituting type). what am I doing wrong here? I'm on .NET 3.5 with ASP.NET MVC 1.0 RTM.

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• jquery slide down image on page load

  - by Dean

  Hi I'm not experienced with jquery (or java script really), but trying to make an image (img id=mike ...) slide in when a page loads. After looking through the jquery docs and trying Google queries, I have so far come up with this $(document).ready(function() { $("#mike").load(function () { $(this).show("slide", { direction: "up" }, 2000); }); }); And applied the CSS display:hidden so it remains hidden until I want it to slide in on page load. This doesn't seem to work unless I reload the page though. Hoping someone could help me out with this please :)

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• Load content while scrolling a div with jquery

  - by enfix

  I need to load content while scrolling a div, not window. That's my CSS code: #sidebar{ width:30%; float:right; height:455px; } #video_list{ height:100%; overflow:auto; } And this is my html code: <div id="sidebar" > <!-- other --> <div id="video_list"> </div> </div> Video_list is scrollable and the content is loaded by ajax call. When I go to the end of scrollbar i need to load content again. How can i determine the height of scrollable div ? I tried this: if ($("#video_list").scrollTop()==$("#video_list").height()){ loadContent(); } but it doesn't work !

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• Microsoft Reporting v.10 load problem

  - by Branko

  Hi, I am trying to reference microsoft reporting v.10.0.0.0 in my vs studio web site. For some reason it can't achieve that as it is always giving me a compile error that it could not load the type. Error 2625 Could not load type 'Microsoft.Reporting.RdlBuildProvider' from assembly 'Microsoft.ReportViewer.Common, Version=10.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' One thing that I think it might be a cause is that I had moved from 9.0.0.0 to 10.0.0.0 and after that it does not work. Any suggestions? Thanks a lot!

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• Dataset -> XML Document - Load DataSet into an XML Document - C#.Net

  - by NLV

  Hello I'm trying to read a dataset as xml and load it into an XML Document. XmlDocument contractHistoryXMLSchemaDoc = new XmlDocument(); using (MemoryStream ms = new MemoryStream()) { //XmlWriterSettings xmlWSettings = new XmlWriterSettings(); //xmlWSettings.ConformanceLevel = ConformanceLevel.Auto; using (XmlWriter xmlW = XmlWriter.Create(ms)) { xmlW.WriteStartDocument(); dsContract.WriteXmlSchema(xmlW); xmlW.WriteEndDocument(); xmlW.Close(); using (XmlReader xmlR = XmlReader.Create(ms)) { contractHistoryXMLSchemaDoc.Load(xmlR); } } } But I'm getting the error - "Root Element Missing". Any ideas? Update When i do xmlR.ReadInnerXML() it is empty. Does anyone know why? NLV

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• How to load jqtouch on-demand

  - by Jayson P.

  I'm trying to load jqtouch on-demand like so: <script type="text/javascript" src="js/jquery.js"</script <script type="text/javascript" $(function() { $.getScript("js/jqtouch.min.js", function() { $.jQTouch(); }); }); </script Firebug outputs: $(_3c.selector).tap is not a function If I include jqtouch.min.js in a script, like I did for jquery.js and call $.jQtouch, everything will work correctly. However, I'd like to load jqtouch only when I need to, however I can't seem to get it to work. I also tried doing an ajax post to jqtouch.min.js and received the same error.

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• URL to load resources from the classpath in Java

  - by Thilo

  In Java, you can load all kinds of resources using the same API but with different URL protocols: file:///tmp.txt http://127.0.0.1:8080/a.properties jar:http://www.foo.com/bar/baz.jar!/COM/foo/Quux.class This nicely decouples the actual loading of the resource from the application that needs the resource, and since a URL is just a String, resource loading is also very easily configurable. Is there a protocol to load resources using the current classloader? This is similar to the Jar protocol, except that I do not need to know which jar file or class folder the resource is coming from. I can do that using Class.getResourceAsStream("a.xml"), of course, but that would require me to use a different API, and hence changes to existing code. I want to be able to use this in all places where I can specify a URL for the resource already, by just updating a property file.

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• Using constructor to load data in subsonic3?

  - by Dennis

  I'm getting an error while trying to load an record through the constructor. The constructor is: public Document(Expression<Func<Document,bool>> expression); and i try to load a single item in like this var x = new Document(f=>f.publicationnumber=="xxx"); publicationnumber isn't a key but tried making an it an unique key and still no go.. Am i totally wrong regarding the use of the constructor? and can someone please tell me how to use that constructor? The error i'm getting is: Test method TestProject1.UnitTest1.ParseFileNameTwoProductSingleLanguage threw exception: System.NullReferenceException: with the following stacktrace: SubSonic.Query.SqlQuery.Where[T](Expression1` expression) Load`[T]`(T item, Expression1expression) db.Document..ctor(Expression``1 expression) in C:\@Projects\DocumentsSearchAndAdmin\DocumentsSearchAndAdmin\Generated\ActiveRecord.cs: line 5613 rest removed for simplicity Regards Dennis

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• COM Add-in for Excel doesn't load when Excel is launched by opening file

  - by Nick Hebb

  Several users have reported that if they launch Excel by double-clicking an Excel file, the add-in will not load. But, if they open Excel via the Start menu (or Quick launch toolbar) the add-in loads fine. Some details, in case they help: It is a COM add-in, written in VB6. The problem has been reported on Windows XP/Excel 2003 and Vista/Excel 2007 systems. The add-in implements IDTExtensibility2. The start mode is set to "Load on Startup". Any thoughts on the cause or how to troubleshoot this would be greatly appreciated.

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• How to upload images from iPhone app developed using Titanium

  - by Karthik.K

  Hi, I finally landed up in developing an iPhone app using Titanium Mobile. Now the problem I face is, Im able to run the app, and the app also sends the image to the server. But Im not able to see the file that got uploaded to the server. I have pasted the iPhone app's code to send image to the server and also, the PHP file that would receive the file from the app. var win = Titanium.UI.currentWindow; var ind=Titanium.UI.createProgressBar({ width:200, height:50, min:0, max:1, value:0, style:Titanium.UI.iPhone.ProgressBarStyle.PLAIN, top:10, message:'Uploading Image', font:{fontSize:12, fontWeight:'bold'}, color:'#888' }); win.add(ind); ind.show(); Titanium.Media.openPhotoGallery({ success:function(event) { Ti.API.info("success! event: " + JSON.stringify(event)); var image = event.media; var xhr = Titanium.Network.createHTTPClient(); xhr.onerror = function(e) { Ti.API.info('IN ERROR ' + e.error); }; xhr.onload = function() { Ti.API.info('IN ONLOAD ' + this.status + ' readyState ' + this.readyState); }; xhr.onsendstream = function(e) { ind.value = e.progress ; Ti.API.info('ONSENDSTREAM - PROGRESS: ' + e.progress+' '+this.status+' '+this.readyState); }; // open the client xhr.open('POST','http://www.myserver.com/tmp/upload2.php'); xhr.setRequestHeader("Connection", "close"); // send the data xhr.send({media:image}); }, cancel:function() { }, error:function(error) { }, allowImageEditing:true }); And here is the PHP code on the server: http://www.pastie.org/891050 I'm not sure where I'm going wrong. Please help me out in this issue. Would love to provide if you need some more information.

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• Load Balancing using SQL Server and TempData MVC

  - by Jamie

  Hi all, I've been told that MVC 1.0 TempData does not work under a load balancer when using SQL Server and that it is because the Dictionary itself is not serializable. We require this for a project and are looking to be able load balancer effectively. So I would be very grateful if someone could answer the following questions: Is there away around this so you can make it work? Is this fixed in MVC 2.0? Can we create a ITempDataProvider to fix it? Or has anyone made a fix to the source code for a project of their own they would like to share? Cheers, Jamie

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• How do you load the app.config file into a DLL

  - by Bluephlame

  So I cant find a definitive answer to the Question. How do you load the app.config file into a DLL. I understand that generally the App.config info should be put into the executable app.config. However i am building an add-in and have to executable available. I would like to use the namespace.dll.config file to store my variables, but i need a way of loading it into the system. Do you need to build out some code to load this file in? Can you use the configurationManager namespace to make this happen easily?

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• How to specify behavior of Java BufferedImage resize: need min for pixel rows instead of averaging

  - by tucuxi

  I would like to resize a Java BufferedImage, making it smaller vertically but without using any type of averaging, so that if a pixel-row is "blank" (white) in the source image, there will be a white pixel-row in the corresponding position of the destination image: the "min" operation. The default algorithms (specified in getScaledInstance) do not allow me a fine-grained enough control. I would like to implement the following logic: for each pixel row in the w-pixels wide destination image, d = pixel[w] find the corresponding j pixel rows of the source image, s[][] = pixel[j][w] write the new line of pixels, so that d[i] = min(s[j][i]) over all j, i I have been reading on RescaleOp, but have not figured out how to implement this functionality -- it is admittedly a weird type of scaling. Can anyone provide me pointers on how to do this? In the worse case, I figure I can just reserve the destination ImageBuffer and copy the pixels following the pseudocode, but I was wondering if there is better way.

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• Breaking a captcha

  - by Fabiano PS

  What I'm looking for is a way to break this captcha: https://www.nfe.fazenda.gov.br/PORTAL/FormularioDePesquisa.aspx?tipoConsulta=completa Notice that the image alternates based on 2 types of images. Anyone knows a OCR (optical character recognition) 'damm good'for this? Other solutions also accepted (except proxing). I'm not looking for spamming, I just want to automatize my Software instead of proxing the image for the user. Nowhere in the site says it is forbidden to automatically parse the image.

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