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• UUIDs in CouchDB

  - by PartlyCloudy

  I am wondering about the format UUIDs are by default represented in CouchDB. While the RFC 4122 describes UUIDs like 550e8400-e29b-11d4-a716-446655440000, CouchDB uses continuously chars like 3069197232055d39bc5bc39348a36417. I've searched some time in both their wiki and their documentation what this actually is, however without any result. Do you know whether this is either a non RFC-conform format omitting all - or is this a completely different representation of the 128 bits. The background is that I'm using Java UUIDs which are formatted as noted in the RFC. I see the advantage that the CouchDB-style is probably more handy for building internal trees, but I want to be sure to use a consistent implementation.

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• Does Oracle 11g automatically index fields frequently used for full table scans?

  - by gustafc

  I have an app using an Oracle 11g database. I have a fairly large table (~50k rows) which I query thus: SELECT omg, ponies FROM table WHERE x = 4 Field x was not indexed, I discovered. This query happens a lot, but the thing is that the performance wasn't too bad. Adding an index on x did make the queries approximately twice as fast, which is far less than I expected. On, say, MySQL, it would've made the query ten times faster, at the very least. I'm suspecting Oracle adds some kind of automatic index when it detects that I query a non-indexed field often. Am I correct? I can find nothing even implying this in the docs.

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• Switching to HTML 5 and CSS3

  - by Kevin Sylvestre

  I constantly find myself creating sites using newer technologies (such as HTML 5 and CSS 3, then adding either backwards compatibility layers or porting entirely to XHTML 1.0 and CSS 2.1. This process often involves replacing CSS with sprite images and adding in flash components for advanced asynchronous support. My question is when can I can start to use the modern standards exclusively. Do I need to wait until Internet Explorer 9 is released or is it acceptable to request users switch to a "better" browser? Furthermore, if dropping compatibility for non HTML 5 browsers is an option, is it reasonable to ask mainstream users to install the Google Frame Frame? Thanks.

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• Customer provider Password Reset client.

  - by ProfK

  I'm looking for guidence on writing a custom password reset UI, but it must fit the Provider 'Pattern', or degrade silently to built-in defaults. E.g. my Reset Control must collect extra information, and perform differently to the standard Password Recovery Control. It must close as possible use the standard MembershipProvider interface for standard functions, and only use an extended interface for the non-standard stuff. I'd like some reading on issues such as, what must I ask the Membership Provider for, and what must I do myself. What must I tell the provider (service?) about what I do? Etc.

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• How to set the locale for a process launched by CreateProcess()

  - by VoidPointer

  When launching a process with CreateProcessW(), is it possible to have the process created with a different MBCP locale/codepage then the one that is configured as the system-wide default code page? In the target process, this should have the same effect as calling _setmbcp(). The target process is not a unicode-enabled and uses a plain main(int argc, char **argv) entry point. I would like to be able to select the code page to which unicode arguments passed to CreateProcessW() are converted to be different from the system's default codepage for non-unicode programs.

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• Credit Card checksums and validations that do not require connection to the financial institution

  - by cjavapro

  The validations I know of are: Checksum the whole card number should add up to zero. (range is 0-9) Check the first digit(s) against the card type Check the length against the card type Check the CCV length against the card type (I think all the major types are 3 anyway) Of course make sure it is accepted card type as well as non expired. Are there any other validations :) (I expect many folks did not know about all of these) The reason I ask is because I overheard there was one to checksum number against expiration or CCV.. I just wanted to check.

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• jqGrid: Is it possible to commit a cell change when tabbing off instead of pressing Enter?

  - by The Matt

  I have a simple in-line edit in my grid, and I want to commit the change when the user tabs off the textbox. The default behavior of jqGrid forces the user to press 'Enter' to commit the change, but this is non-intuitive for our users. onSelectRow: function(id) { $(gridCoreGroups).editRow(id, true, undefined, function(response) { alert("hello world"); } } I've worked my way through the events provided, but they all happen as a result of the user pressing 'Enter', which I want to avoid. Is there something I can wire up that would trigger an action when the user tabs off this cell?

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• updated validation example for web api

  - by MonkeyBonkey

  I tried the validation example code for web api on the latest mvc 4 download and I'm getting some errors. Does anyone have an updated example of the ValidationActionFilter class. Here's the original code public class ValidationActionFilter : ActionFilterAttribute { public override void OnActionExecuting(HttpActionContext context) { var modelState = context.ModelState; if (!modelState.IsValid) { dynamic errors = new JsonObject(); foreach (var key in modelState.Keys) { var state = modelState[key]; if (state.Errors.Any()) { errors[key] = state.Errors.First().ErrorMessage; } } context.Response = new HttpResponseMessage<JsonValue>(errors, HttpStatusCode.BadRequest); } } } I'm getting an error on HttpResponseMessage The non-generic type 'System.Net.Http.HttpResponseMessage' cannot be used with type arguments Also it looks like I need to add a Json reference, but should I be using JSON.net instead? An example of this using Json.net?

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• Sorting 1000-2000 elements with many cache misses

  - by Soylent Graham

  I have an array of 1000-2000 elements which are pointers to objects. I want to keep my array sorted and obviously I want to do this as quick as possible. They are sorted by a member and not allocated contiguously so assume a cache miss whenever I access the sort-by member. Currently I'm sorting on-demand rather than on-add, but because of the cache misses and [presumably] non-inlining of the member access the inner loop of my quick sort is slow. I'm doing tests and trying things now, (and see what the actual bottleneck is) but can anyone recommend a good alternative to speeding this up? Should I do an insert-sort instead of quicksorting on-demand, or should I try and change my model to make the elements contigious and reduce cache misses? OR, is there a sort algorithm I've not come accross which is good for data that is going to cache miss?

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• How to create a valid schema in a WSDL that restrict to <|<=|>|>=

  - by wsxedc

  This is what I have in my schema section of my WSDL to specify the field has to be comparison operators <xsd:simpleType> <xsd:restriction base="xsd:string"> <xsd:pattern value="&lt;|&gt;|&lt;=|&gt;=|="/> </xsd:restriction> </xsd:simpleType> SoapUI complains about this part of the WSDL, I tried to set the value to something with non special characters and the WSDL is valid. So I tried to replace that whole long string to be value=">gt;" and it valid but value="<lt;" is not valid, and value=">" is also not valid. My question is, why does the WSDL validation need > to be double escaped? The main question is, how to provide a valid less than side within the pattern value.

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• iPhone/iPad fatal error in C++ code produces no output in the log

  - by morgancodes

  I'm trying to move away from Objective-C to C++ for audio in my iPad programming, due to the a few reports I've heard of Objective-C selectors sometimes causing audio glitches. So I'm starting to use pure C++ files. When a fatal error happens in one of the C++ files, I get no output from the log. The app just crashes. For example, if I do this in my C++ file: env = new ADSR(); cout << "setting env to null\n"; env = NULL; env->setSustainLevel(1); cout << "called function on non-initialized env\n"; I get the following output: setting env to null After that, there's a method called on NULL, which apparently kills the app, but absolutely nothing to that effect is reported. What do I need to do to have useful information logged when there's an error in my C++ code?

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• wav stopped working with AudioServices on my iPhone app?

  - by user157733

  I have a wav file that was working fine. It is played using the AudioServices methods. Suddenly it stopped working. The weird thing is if i change he wav file to a different one that works. Any idea what is going on? The non working sound is slightly longer (still <10seconds) but it was originally working so I just can't figure it out. Any suggestions of what to try would be most appreciated. Thanks :-)

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• Why does this page look different between IE, Firefox & Chrome

  - by ripper234

  In Firefox it looks just like I want it to look, in IE it looks "a bit weird", and in Chrome it's all twisted. What non-standard HTML I am using that makes it looks so different between browsers? Specifically, how can I fix the Chrome & IE versions to look more like Firefox? Note that Chrome only goes haywire if all or almost all columns have the yellow stickies. If one or two columns are empty, then Chrome displays the page just like Firefox. The full HTML is at this pastebin.

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• Does anyone know of a good script to force file downloads and yet protect download links on a PHP se

  - by racl101

  I tried using a free script that I found on the Internet but it is giving me problems with Windows users (even though they are using IE 8, so it's not an option for me to ask them to upgrade their browsers.) Here's the requirements: I have a bunch of Microsoft Word and pdf files that need to be protected so that only authorized users can download them. I have already created the login system and the current script I have works fine for non-IE browsers. However, I keep getting recurring problems with Windows users who keep complaining that their files download corrupt and yet everyone else either using Mac or Linux or any other browser gets on just fine. The script must allow me to store files in a directory but force download of the file upon the function call. Must work well with most major browsers, especially I.E. If you have any practice suggestions or know of any great scripts (even if they are paid, I'm sick of this problem and would probably pay for a paid script) it would be greatly appreciated in advance.

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• Prevent browser form submission when Wicket AjaxFormValidatingBehaviour validation fails

  - by Brian Laframboise

  I have a Page with a Wizard component. The user can navigate the panels of the wizard by using the next and previous buttons which I have performing full (non-ajax) form submissions so that the app is back-button friendly. When the next button is clicked, I would like to attempt ajax form validation (if javascript is enabled). I tried doing: nextButton.add( new AjaxFormValidatingBehavior( form, "onsubmit") ); to add such validation. The behaviour works - however, when validation errors occur the browser still submits the entire form. What is the Wicket way to prevent the browser from submitting the form in this case?

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• Python design mistakes

  - by Andrea

  A while ago, when I was learning Javascript, I studied Javascript: the good parts, and I particularly enjoyed the chapters on the bad and the ugly parts. Of course, I did not agree with everything, as summing up the design defects of a programming language is to a certain extent subjective - although, for instance, I guess everyone would agree that the keyword with was a mistake in Javascript. Nevertheless, I find it useful to read such reviews: even if one does not agree, there is a lot to learn. Is there a blog entry or some book describing design mistakes for Python? For instance I guess some people would count the lack of tail call optimization a mistake; there may be other issues (or non-issues) which are worth learning about.

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• Is there a good web-based project management app with scheduling?

  - by Andykiteman

  Ideally something as intuitive as basecamp, with good usability and accessibility. The best I've seen is huddle.net but it's still weak in several areas. Must have: Projects - ability to add people & tasks and schedule tasks to people Calendar - showing when people are busy or available Role based access - Admins and non-admins History - ability to look back at all history Anyone seen a product that's worth a look? Clarification: Must be hosted i.e. not require my own hardware or IT staff I'm looking for an app to schedule people with specific tasks at specific times and monitor the outcomes. I'm already using Mingle (for stories), Basecamp (to run the business) and Exceptional (to track bugs). I'm not looking for a bug-tracking system or a story management application (I already looked at VersionOne, but chose Mingle due to it's nicer UI) My response to the answer being auto-selected: I still don't feel the answer (chosen for me) is the correct one. It's a useful list but little more, and doesn't provide the solution I was seeking.

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• Is there a way to highlight specific words or numbers without inserting a span tag?

  - by Taylor

  I've got blocks of text with various specs in them and want to have jquery highlight whatever matches a specific pattern without inserting any extra html. The following is the kind of text that I've got to work with. Intel® Core™ i7 Processor 920 (2.66GHz, 8MB cache, 4.8GT/sec)/ Genuine Windows® 7 Home Premium 64bit- English/ 640 GB Serial ATA non Raid (7200 Rpm)/ 6GB 1333MHz (3x2GB) Tri Channel Memory/ Display Not Included/ 16X DVD+/- RW Optical Drive (DVD & CD read and write)/ 1.8GB NVIDIA® GeForce™ GTX260 graphics card/ Integrated HDA 7.1 Dolby Digital Audio What I'm hoping jquery can do is highlight some of the basic specs without inserting any extra html. Maybe working off a list of values matching the spec format using some wildcards where neededed? The css to select the correct tag is #list div div div+p or I could just give the p class but would rather not. Is this kind of thing possible?

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• Detect if an assembly is available

  - by jgaa

  I'm implementing an installer in Java, that is supposed to download and install an application for non-privileged users in Windows (from XP and up). The application is written in C++, and depend on the usual VC runtime-libraries (msvcm90.dll and friends). In order to save bandwidth, I want to avoid downloading the VC redistributables if they already are available for the user. I do however have a problem finding a reliable method to detect if an assembly is installed. If the assembly is missing, I will deploy it as described here: http://msdn.microsoft.com/en-us/library/ms235291%28VS.80%29.aspx So the question is simply how to detect if a (any) assembly is installed on the machine. It's no requirement that this can be done from Java. I can easily write a small probe in C++ and link it statically for the task. jgaa

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• Detect when home button is pressed iOS

  - by nick

  I have several iOS apps that all use the same port to listen for a network beacon. On the main view I use viewWillDisappear to close the port when another view is opened, which was working great. Then I noticed if I pressed the home button from the main view controller without opening another view to close the port, then the port stays open and non of my other apps can listen on that port any more. I then tried using viewWillUnload, but that doesn't seem to get called when I press the home button. -(void)viewWillUnload { //[super viewWillUnload]; NSLog(@"View will unload"); [udpSocket close]; udpSocket = nil; } View will unload is never displayed in the console, which leads me to believe that the method is never getting called. Is there a way to detect when the home button is pressed so I can close my port?

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• FreeText Query is slow - includes TOP and Order By

  - by Eric P

  The Product table has 700K records in it. The query: SELECT TOP 1 ID, Name FROM Product WHERE contains(Name, '"White Dress"') ORDER BY DateMadeNew desc takes about 1 minute to run. There is an non-clustered index on DateMadeNew and FreeText index on Name. If I remove TOP 1 or Order By - it takes less then 1 second to run. Here is the link to execution plan. http://screencast.com/t/ZDczMzg5N Looks like FullTextMatch has over 400K executions. Why is this happening? How can it be made faster?

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• Interaction between for loops with clock function?!

  - by learningtolive

  Can someone explain me the exact interaction in context of delay between the two for loops with clock function. How does for1 interact with for2 on the cout statement(30 on 640000000)? start=clock(); cout<<endl<<start<<endl; for(delay=0; delay<30; delay++) for(i=0; i<640000000; i++); end=clock(); cout<<end<<endl; cout<<"Num of ticks for non reg-loop: "; cout<<end-start<<'\n';

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• How to generilize view?

  - by MexicanHacker

  Hey guys, I'm in the process of designing a set of views that use the same model in my app, the difference is that some views will differ in Read Only and Modifiable fields. So for example for view A I want to be able to modify A.One but no A.Two properties and for view B I want to have B.One and B.Two as modifiable fields. I was thinking in having a map that will hold this information and iterate both the modifiable and non-modifiable lists in a generic view, but I was thinking that maybe I can get feedback from you guys. What do you think?

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• When did the idea of macros (user-defined code transformation) appear?

  - by Jay

  I have read McCarthy's 1960 paper on LISP and found no reference to anything that's similar to user-defined macros or normal order evaluation. I was wondering when marcos first appeared in programming language history (and also in Lisp history): When was the idea of user-defined code transformation (before interpretation or compilation) first described (theoretically)? What was the first programming language implementation to have Lisp-like macros (by "Lisp-like" I mean "using a readable Turing-complete language to do code-transformation")? (including non-Lisps -- Forth for example is quite old, but I'm not sure if the first Forth implementation already had "IMMEDIATE") What was the first Lisp dialect to have macros? Thank you!

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• Map a struts2 action result to a controller instead of a jsp

  - by Jim

  Hello, I'm working on on a site built using struts2. The vast majority of our targets generate xml, so mapping the result to a jsp page makes sense. A couple of our targets actually generated binaries. I'm wondering if there is a convenient way to say that the result should come from a servlet/controller instead of a jsp. Obviously this could be done by modifying the web.xml so the struts filter doesn't apply to those targets and mapping those targets as servlets, but this is non-ideal. Currently, the struts filter applies to the entire site, and we would like to keep it that way. Ideas? Thanks!

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