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• How to create a delayed queue in RabbitMQ?

  - by eandersson

  What is the easiest way to create a delay (or parking) queue with Python, Pika and RabbitMQ? I have seen an similar questions, but none for Python. I find this an useful idea when designing applications, as it allows us to throttle messages that needs to be re-queued again. There are always the possibility that you will receive more messages than you can handle, maybe the HTTP server is slow, or the database is under too much stress. I also found it very useful when something went wrong in scenarios where there is a zero tolerance to losing messages, and while re-queuing messages that could not be handled may solve that. It can also cause problems where the message will be queued over and over again. Potentially causing performance issues, and log spam.

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• Recaptcha being triggered from masterpage control

  - by superexsl

  Hey, I have a master page which contains a Login control so that the user can login/logout from any page. However, a couple of content pages require a Recaptcha control. This causes problems because when I try and log in on a page that has the Recaptcha control, the system expects me to enter the words. I'm aware of the lack of validation groups in the Recaptcha control, and the fact that you can't have multiple forms on an ASP.NET page. Is there a way to work around this? A 'hacky' way I can think of, is in the "Login" event, check the page for a Recaptcha control. If one exists, then disable it, otherwise continue. However, that just seems quite inefficient especially when there are quite a few pages and most won't have a Recaptcha control.

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• How can I learn the math necessary for working with computer vision?

  - by Duncan Benoit

  I know that computer vision involves a lot of math, but I need some tips about how programmers gain that knowledge. I've started to use the OpenCV library but I have some major problems in understanding how the math works in the algorithms. In college I have studied some math and we worked with matrices and derivatives, but I didn't pay to much attention to the subject. It seemed to be so difficult and useless from a programmer point of view. I suppose that there has to be some easy way to understand what a second derivative is without calculating an equation. (Derivatives are just an example) Do you have any tips for me about how can i gain such knowledge? A forum, book, link, advice, anything?

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• xcode syntax color coding explained?

  - by Max Fraser

  Can anyone give me a quick rundown of the color syntax meanings in xcode? I am running into some problems and understanding the color coding I am sure will help me out. Currently I have some variables that are light blue and I think they need to be black but I am not sure of the difference? masterViewController=[[UINavigationController alloc] initWithDestination: destination]; I believe my masterViewController here should be colored black and not the light blue it is currently colored - I am assuming I defined or initialized something wrong somewhere. First day in xCode so I am pretty damn confused!

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• How do I update an MKAnnotation location with new coordinates?

  - by user345711

  Hi everyone, i'm having problems trying to update an annotation location with different coordinates. Is there any way I can change de location property without having to create another annotation? I've tried the code below with no luck. The annotation i'm trying to get is not updating its location. Please help! CLLocationCoordinate2D location; location.latitude = -36.560976; location.longitude = -59.455807; for (id annotation in self.mapView.annotations) { if ([annotation isKindOfClass:[MyAnnotation class]]) { [annotation setCoords:location]; //setCoords is defined in MyAnnotation class } } Thank you all!

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• C# - Do you use "var"?

  - by Paul Stovell

  C# 3.0 introduces implicitly typed variables, aka the "var" keyword. var daysInAWeek = 7; var paul = FindPerson("Paul"); var result = null as IPerson; Others have asked about what it does or what the problems with it are: http://stackoverflow.com/questions/527685/anonymous-types-vs-local-variables-when-should-one-be-used http://stackoverflow.com/questions/209199/whats-the-point-of-the-var-keyword http://stackoverflow.com/questions/41479/use-of-var-keyword-in-c I am interested in some numbers - do you use it? If so, how do you use it? I never use var (and I never use anonymous types) I only use var for anonymous types I only use var where the type is obvious I use var all the time!

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• Windows XP Home Edition SP3 cant recognise PCMIA SD Card

  - by Pozo

  System Specifications: Laptop : Dell Inspiron 6000 OS: Windows Home Edition SP3 SD Adapter: Hagiwara Smart Media Adapter I inserted the card into the slot, windows xp recognises the device, lists the pcmia controller on the device manager list, an entry appears under the IDE ATA/ATAPI category on the device manager as well. However, the device does not show under my computer and the driver does not get assigned a letter number. I checked the system logs from the device manager and there were no logged errors. Checking the Hagiwara support website, the manufacturer indicates that the adapter driver is the same as the windows xp pcmia controller. Checking Dell's website, no specific drivers were listed for that either. General Search on the web indicates that multiple people face similar problems with their SD cards, yet none actually spell out the route issue that causes this. Please let me know if you have any suggestions for further debugging. Thanks in advance

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• CSS Padding Issue w/ submit button

  - by Thomas

  This is a dumb problem but I can't seem to set the padding on a submit button properly. No matter what I input for padding, the width and height of the button never changes. Here is the css: .green_submit { color: #fff; background-color: #94c909; border-right: 1px solid #6d9307; border-bottom: 1px solid #6d9307; border-left: none; border-top: none; padding: 25px; } And the HTML: <input type="submit" class='green_submit' value="Validate" /> Any obvious problems here? How can I manipulate the padding on a submit button?

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• Is it really wrong to version documents using CouchDB's default behaviour?

  - by Tomas Sedovic

  This is one of those "I know I shouldn't do this but it's oh so convenient." questions. Sorry about that. I plan to use CouchDB for storing a bunch of documents and keeping their entire revision history. CouchDB does the versioning automatically, but it is strongly discouraged for programmer's use: "You cannot rely on document revisions for any other purpose than concurrency control." From what I've found on the CouchDB wiki, the versions can get deleted either during compaction or during replication. As far as I can tell, Compaction must always be triggered manually and Replication occurs only when there's more than one database server. The question is: if I won't run compaction and will use only single database instance for my documents, can I just use CouchDB's document versioning and expect it to work? What other problems I might run into? E.g. does not running compaction hurt the performance or consume significantly more disk space (than if I did handle the versioning manually)?

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• How to achieve multiple grids like the SQL server Results pane

  - by Skun

  Hi guys ! I'm having problems with my project once again :( The front end is C# I need to support multiline querying like MS SQL server and when these queries are executed, naturally there are going to be multiple result sets. Getting the datatables respective to the results is not a problem, but how do i make it appear like its done in MS SQL server. One result set below the other and with a scroll bar? Should i bind it to a datagrid? If so how can i bind multiple tables to a datagrid ? and will it generate the scrollbars and the columns automatically? If i am not clear, please let me know and i'll try to be more clearer. ps: If anyone knows how this can be done with the XtraGridControl in devexpress that would be awesome ! :D

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• Can't DER encode and BER decode RSA public key

  - by Mildred

  I have problems using Crypto++ to save a RSA public key (that I obtained loading a private key file in PKCS#8 format). When decoding the key, I always get a BERDecodeErr exception. Here is the code I am using: CryptoPP::RSASSA_PKCS1v15_SHA_Signer _signer; CryptoPP::RSASSA_PKCS1v15_SHA_Verifier _verifier; CryptoPP::ByteQueue bytes; //_signer.AccessPublicKey().Save(bytes); // seem to save private key instead _signer.AccessKey().DEREncodePublicKey(bytes); //_verifier.AccessKey().Load(bytes); //_verifier.AccessKey().BERDecodePublicKey(bytes, 0, 0); _verifier.AccessPublicKey().Load(bytes); I also tried with the instructions commented above, without success. How do you do to save or open the public key? The public key looks like this in hex format, is there a tool to check its format / validity (regarding what crypto++ supports) ? 3081890281810097e24f2e95504a397e90fbc56d1b330ab2ab97a0d326007b890e40013f9e1d9bd9 f54b0c0840782ddae19b5b4595d8f8b9ffe0d2120174fcbc39585c5867cd2dfba69f8e540caa2c52 de8f08278a34e9249120500117f0ba756c5bb2be660013160db9f82f75deb7ccf63742a9e945da6c cf30c2b109b73342daaabd02b872e50203010001

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• BadAlloc X Error

  - by paultop6

  Hi Guys, Im having some problems with a GTK program im trying to build. When i compile it i keep getting this error: This probably reflects a bug in the program. The error was 'BadAlloc (insufficient resources for operation)'. (Details: serial 195 error_code 11 request_code 53 minor_code 0) Ive traced it down to the following command that appears to be causing it: gtk_box_pack_start(GTK_BOX (Top_Graph), Widget_Get (Graph_Cpu), TRUE, TRUE, 0); Now Top_Graph and Graph_Cpu are both GtkVbox Widgets. Has anyone ever seen an error like this, and could they give me some advice as to how it is caused Regards Paul

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• Best Ergonomic trackball (finger-operated, with scroll wheel) for programmer

  - by Clay Nichols

  We programmers are at great risk of RSI. After 10 years, I was having shoulder problems and switched to a trackball, which helped, then switched to my left hand which helped even more. I'm looking for a good finger-operated trackball with a scroll wheel. (I do not like the ones where you control the ball w/ your thumb. My thumb isn't as dexterous). I also want to have a scroll wheel. I currently use a Logitech Marble Mouse but the scrolling implementation is very poor. EDIT: I just tried the Marble Scroll (free software that provides better scrolling. Works great. Another option is the KatMouse addon (which I've not tried) for trackballs. I hear the old Logitech Trackman was very good, but is no longer available. Anyone have experience with the Marble Mouse (and the above fixes) ? Or any suggestions of a good trackball.

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• Learning resources for Linux filesystem, command line, and structure

  - by webworm

  Can anyone suggest some good materials for learning more about the Linux filesystem and command line? I have found myself frequently confused as to what programs go where on the Linux filesystem. I would like to learn how the various directories (var, etc, usr ...) are used and how to use the commandline more effectively. I come from the Windows development world (.NET developer) so I am very familiar with Windows system administration. However, when doing more and more work with PHP I found myself lost in the internals of Linux (specifically Ubuntu). For example I was having problems installing PEAR properly on my Ubuntu system and not understanding why it was installed where it was. All of my interactions with Linux machines is done via SSH so I would like to focus on the command line and the filesystem. Thanks for any suggestions.

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• TinyMCE converts &lt;xxx&gt; into <xxx></xxx> - how do I stop it?

  - by Petras

  I can successfully save the characters < and . I do this with these options: entities : """ cleanup : false verify_html : false So far no problems. However, whenever I put anything between that text it gets converted into a tag: &lt;xxx&gt; converts to <xxx></xxx> How do I stop that?I am trying to enter sample HTML into TinyMCE so I can document some XML. There must be a standard way of doing this I imagine.

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• Why can't I publish MVC project

  - by Vnuk

  I'm having problems publishing my MVC project. When I do publish and upload everything to web server I get this: [InvalidOperationException: The view 'Index' or its master could not be found. The following locations were searched: ~/Views/Home/Index.aspx ~/Views/Home/Index.ascx ~/Views/Shared/Index.aspx ~/Views/Shared/Index.ascx] Weird thing is that Index.aspx exists in ~/Views/Home/, but IIS cannot find it there. If I copy entire project to web server and let asp.net compile it on the fly it works like a charm. My routing code: routes.MapRoute( _ "Default", _ "{controller}/{action}/{id}", _ New With {.controller = "Home", .action = "Index", .id = ""} _ ) routes.MapRoute("Root", "", New With {.controller = "Home", .action = "Index", .id =""}) I'm using IIS7 on Windows 2008 Web server. ASP.NET MVC 1.0, Visual Studio 2008. I've tried it local with IIS7 on Windows 7 - same error.

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• Porting Django's templates engine to C

  - by sandra

  Hi folks, I recently wrote a simple and tiny embedded HTTP server for my C++ app (QT) and I played a little bit with Ry's http-parser and loved it. This guy is crazy. So I told to myself: "Hey! Why not port the django template engine to C?" That'd be awesome! I know, it won't be an easy task (not at all, I know) but I'd really love to implement this. So I came here for inspiration, ideas, opinions... I'd really love to have some pointers on the subject, ideas, what is already done, which major problems I'll encounter (and how to solve them) - How not to reinvent the wheel... anyway, you got the idea :) Thanks a million times! P.S. Simple code snippets, and links to tools and libs are very welcome! P.P.S. I'm already aware of grantlee, I took a look into its sources. Well... that's C++ and its specific to Qt.

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• VB.NET ASP.NET Web Application woes (VS 2008)

  - by typoknig

  Hi all, I am making my first web application with ASP.NET and I am having a rough time. I have previously created the application I am working on as a Windows Form application and it works great, but I am having problems with the HTML side of things in the web application. My issues are pretty minor, but very annoying. I have worked with websites before and CSS, but as far as I can tell I do not have direct access to a CSS when creating a web application in VS 2008. My biggest issue is the positioning of components that I have dragged onto the "Default.aspx" form. For instance, how am I supposed to float a panel next to another one if I don't have a CSS, or how am I to correctly position a label?

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• Chained address rewrite in Wordpress

  - by kemp

  What I need to do is rewriting this address: (1) http://localhost/wordpress/fake/text-value to (2) http://localhost/wordpress/gallery?somevar=text-value Notes: the remapping must be transparent: the user always has to see address (1) gallery is a permalink to a wordpress page, not a real address I basically need to rewrite the address first (to modify it) and then feed it back to mod rewrite again (to let wordpress parse it its own way). Problems if I simply do RewriteRule ^fake$ http://localhost/wordpress/gallery [L] it works but the address in the browser changes, which is no good, if I do RewriteRule ^fake$ /wordpress/gallery [L] I get a 404. I tried different flags instead of [L] but to no avail. How can I get this to work?

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• CodeIgniter based e-shop, shipping and gift address design problem

  - by alexander

  While building an ecommerce platform I have run into design problems. I'm working with the built-in CodeIgniter's cart class. It stores all the cart information in session. Let say that cart has already been filled with products and user clicks checkout. When should I store order in database? Just after that click or after several steps of gathering information and stoing it in session? How to deal with additional features like different shipping methods? Should I add it to the basket first and get additional (gift address) to session? I dont want to store it in database because of the relation between gift address and order is needed and since I dont know what's the ID of the order. I'm puzzled :) Additionally I think its crucial to keep cart aware of shipping methods and additional bought services (by selecting gift address there is an extra fee) because the cart content is just like an reciept? In brief, what is the best practice to process checkout?

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• WSS 3.0 navigation structure

  - by Dante

  Hi all, I'm a beginner in WSS 3.0 and I'm having some problems with the navigation setup. I can't find any documentation that clearly recommends best practices in this area. I'm trying to create an intranet, custom look and feel, that should have a structure similar to: Company - News - News type 1 - News type 2 - Organogram - ... Employees - Employees 1 - Employees 2 - Employees 2_1 - ... How to properly set this up? Company, News, are sites/subsites? And News type 1 and 2 are pages within a site? I created as described above and in the master page of the main site I added some scripts that will be used by web parts, like jquery. The subsites will have their own master page and will not recognize the scripts, I need to add them there which is annoying. Any recommendations? Or some resource that provides best practices setting up these structures? Thx in advance

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• Text Editor For Flash?

  - by JasonS

  Hi, I work for a company which produces flash websites. The CMS is built in PHP. The client can update the text on the CMS site. Currently it uses a really old, bad, flash text-editor. It needs to be upgraded to something much much better. I need a text editor that will produce 'flash-html' as well as 'valid-html'. Or even something that marks up the text in the way that would allow me to do this. I tried using TinyMCE and ran into problems trying to convert the HTML. Has anyone tried doing this? Can anyone recommend anything or give any tips on how I can do this?

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• Aging Data Structure in C#

  - by thelsdj

  I want a data structure that will allow querying how many items in last X minutes. An item may just be a simple identifier or a more complex data structure, preferably the timestamp of the item will be in the item, rather than stored outside (as a hash or similar, wouldn't want to have problems with multiple items having same timestamp). So far it seems that with LINQ I could easily filter items with timestamp greater than a given time and aggregate a count. Though I'm hesitant to try to work .NET 3.5 specific stuff into my production environment yet. Are there any other suggestions for a similar data structure? The other part that I'm interested in is aging old data out, If I'm only going to be asking for counts of items less than 6 hours ago I would like anything older than that to be removed from my data structure because this may be a long-running program.

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• How do I include external Libraries in CodeIgniter?

  - by user259954

  I'm new to codeigniter, and I'm trying to integrate amazon's FPS into my page. There are a bunch of libraries and models that go with Amazon FPS, which I would need included to make the appropriate calls. How do I include them in CodeIgniter? I tried placing the entire Amazon folder inside the system/libraries directory, and then tried including libraries with $this-load-library( 'Amazon/FPS/Client' ); However, I run into problems with the relative path there, because Client.php contains the statement require_once ('Amazon/FPS/Interface.php'); ... which is in the same folder. There has to be a better way to do all this - can anyone please help? Thanks!!

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• Call iconv from Ruby through system()

  - by Sebastian

  I have a problem with iconv tool. I try to call it from rake file in that way: Dir.glob("*.txt") do |file| system("iconv -f UTF-8 -t 'ASCII//TRANSLIT' #{ file } >> ascii_#{ file }") end But one file is converted partly (size of partialy converted: 10059092 bytes, before convertion: 10081854). Comparing this two files prove that not all content was writen to ASCII. When I call this command explicit from shell it works perfectly. Other smaller files are converted without problems. Is there any limitations on iconv or Ruby's system()?

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