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• How do I use a custom authentication mechanism for a Java web application with Spring Security?

  - by Adam

  Hi, I'm working on a project to convert an existing Java web application to use Spring Web MVC. As a part of this I will migrate the existing log-on/log-off mechanism to use Spring Security. The idea at this stage is to replicate the existing functionality and replace only the web layer, leaving the service classes and objects in place. The required functionality is simple. Access is controlled to URLs and to access certain pages the user must log on. Authentication is performed with a simple username and password along with an extra static piece of information that comes from the login page. There is no notion of a role: once a user has logged on they have access to all of the pages. Behind the scenes, the service layer has a class with a simple authentication method: doAuthenticate(String username, String password, String info) throws ServiceException An exception is thrown if the login fails. I'd like to leave this existing service object that does the authentication intact but to "plug it into" the Spring Security mechanism. Can somebody suggest the best approach to take for this please? Naturally, I'd like to take the path of least resistance and leave the work where possible to Spring... Thanks in advance, Adam.

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• Rails user authorization

  - by Zachary

  I am currently building a Rails app, and trying to figure out the best way to authenticate that a user owns whatever data object they are trying to edit. I already have an authentication system in place (restful-authentication), and I'm using a simple before_filter to make sure a user is logged in before they can reach certain areas of the website. However, I'm not sure the best way to handle a user trying to edit a specific piece of data - for example lets say users on my site can own Books, and they can edit the properties of the book (title, author, pages, etc), but they should only be able to do this for Books that -they- own. In my 'edit' method on the books controller I would have a find that only retrieved books owned by the current_user. However, if another user knew the id of the book, they could type in http://website.com/book/7/edit , and the controller would verify that they are logged in, then show the edit page for that book (seems to bypass the controller). What is the best way to handle this? Is it more of a Rails convention routing issue that I don't understand (being able to go straight to the edit page), or should I be adding in a before_find, before_save, before_update, etc callbacks to my model?

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• Loading the target of a link in a <DIV> via jQuery's .live event into the same <DIV>??

  - by Martin Pescador

  Hello together I call a certain div from another page with jquery to be loaded into a div on my main page like this: <script type="text/javascript"> $("#scotland").load("http://www.example.com/scotland .gallery"); </script> <div id="scotland"></div> The div I call is a piece of code which is automatically generated by a CMS made simple module, by the way. Now it comes to my problem: The .gallery div I call, looks, a little simplified, like this: <div class="gallery"> <span><img src="http://www.example.com/scotlandimage1.jpg"></span> <span class="imgnavi"><a href="link_to_next_page_with_one_image">Next image</href></span> </div> I want the "next image"-link to load the next page into the .gallery div (it is always a page with one image on it). But what it does, is, it opens the new page http://www.example.com/scotland only. I tried to use jquerys .live event to load the linked page (that would be "scotlandimage2" and the navigation, as you can see in the upper part - not only the image!), but I must have done something wrong. I tried different ways, but never got it to work. This was my last try: $(".imgnavi a").click(function() { var myUrl = $(this).attr("href"); $(".gallery").load(myUrl); return false; }); I have to admit that I am very new to jquery... But does someone know what I did wrong (do I even follow the right handlers?)? Thanks very much in advance! Martin

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• jquery ready function: script not detecting a function

  - by deostroll

  There is a web page with place holder (a normal div). Via ajax calls I am loading a <form> and a <script> into the place holder. The script contains necessary javascript to initialize the form (i.e. for e.g. disable the controls so as to make form read-only, etc). Here is a piece of code I have; it works, but the commented part doesn't work. Because the script engine cannot find the object tristate_DisableControl which is a function in one of those scripts I call via ajax. $(document).ready(function() { // $('#site_preferences_content div').each(function() { // if (typeof (window.tristate_DisableControl) == 'undefined') { // if (typeof (window.console) != 'undefnied') // console.log((new Date()).toTimeString() + ' not logable'); // pausecomp(1000); // } // else // tristate_DisableControl(this); // }); //end $('#site_prefrences_content div').each() setTimeout(function() { $('#site_preferences_content div').each(function() { tristate_DisableControl(this); }) }, 1000); }); I thought by the time $(document).ready() executes the DOM will be properly loaded...

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• Trying to use Rhino, getEngineByName("JavaScript") returns null in OpenJDK 7

  - by Yuval

  When I run the following piece of code, the engine variable is set to null when I'm using OepnJDK 7 (java-7-openjdk-i386). import javax.script.ScriptEngine; import javax.script.ScriptEngineManager; import javax.script.ScriptException; public class TestRhino { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub ScriptEngineManager factory = new ScriptEngineManager(); ScriptEngine engine = factory.getEngineByName("JavaScript"); try { System.out.println(engine.eval("1+1")); } catch (ScriptException e) { // TODO Auto-generated catch block e.printStackTrace(); } } } It runs fine with java-6-openjdk and Oracle's jre1.7.0. Any idea why? I'm using Ubuntu 11.10. All JVMs are installed under /usr/lib/jvm. I noticed OpenJDK 7 has a different directory structure. Perhaps something is not installed right? $ locate rhino.jar /usr/lib/jvm/java-6-openjdk/jre/lib/rhino.jar /usr/lib/jvm/java-7-openjdk-common/jre/lib/rhino.jar /usr/lib/jvm/java-7-openjdk-i386/jre/lib/rhino.jar Edit Since ScriptEngineManager uses a ServiceProvider to find the available script engines, I snooped around resources.jar's META-INF/services. I noticed that in OpenJDK 6, resources.jar has a META-INF/services/javax.script.ScriptEngineFactory entry which is missing from OpenJDK 7. Any idea why? I suspect this is a bug? Here is the contents of that entry (from OpenJDK 6): #script engines supported com.sun.script.javascript.RhinoScriptEngineFactory #javascript Another edit Apparently, according to this thread, the code simply isn't there, perhaps because of merging issues between Sun and Mozilla code. I still don't understand why it was present in OpenJDK 6 and not 7. The class com.sun.script.javascript.RhinoScriptEngineFactory exists in 6's rt.jar but not in 7's. If it was not meant to be included, why is there a OpenJDK 7 rhino.jar then; and why is the source still in the OpenJDK source tree (here)?

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• How to test the expectation on the eventSpy

  - by Lorraine Bernard

  I am trying to test a backbone.model when saving. Here's my piece of code. As you can see from the comment there is a problem with toHaveBeenCalledOnce method. P.S.: I am using jasmine 1.2.0 and Sinon.JS 1.3.4 describe('when saving', function () { beforeEach(function () { this.server = sinon.fakeServer.create(); this.responseBody = '{"id":3,"title":"Hello","tags":["garden","weekend"]}'; this.server.respondWith( 'POST', Routing.generate(this.apiName), [ 200, {'Content-Type': 'application/json'}, this.responseBody ] ); this.eventSpy = sinon.spy(); }); afterEach(function() { this.server.restore(); }); it('should not save when title is empty', function() { this.model.bind('error', this.eventSpy); this.model.save({'title': ''}); expect(this.eventSpy).toHaveBeenCalledOnce(); // TypeError: Object [object Object] has no method 'toHaveBeenCalledOnce' expect(this.eventSpy).toHaveBeenCalledWith(this.model, 'cannot have an empty title'); }); }); console.log(expect(this.eventSpy));

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• Parsing basic math equations for children's educational software?

  - by Simucal

  Inspired by a recent TED talk, I want to write a small piece of educational software. The researcher created little miniature computers in the shape of blocks called "Siftables". [David Merril, inventor - with Siftables in the background.] There were many applications he used the blocks in but my favorite was when each block was a number or basic operation symbol. You could then re-arrange the blocks of numbers or operation symbols in a line, and it would display an answer on another siftable block. So, I've decided I wanted to implemented a software version of "Math Siftables" on a limited scale as my final project for a CS course I'm taking. What is the generally accepted way for parsing and interpreting a string of math expressions, and if they are valid, perform the operation? Is this a case where I should implement a full parser/lexer? I would imagine interpreting basic math expressions would be a semi-common problem in computer science so I'm looking for the right way to approach this. For example, if my Math Siftable blocks where arranged like: [1] [+] [2] This would be a valid sequence and I would perform the necessary operation to arrive at "3". However, if the child were to drag several operation blocks together such as: [2] [\] [\] [5] It would obviously be invalid. Ultimately, I want to be able to parse and interpret any number of chains of operations with the blocks that the user can drag together. Can anyone explain to me or point me to resources for parsing basic math expressions? I'd prefer as much of a language agnostic answer as possible.

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• iPhone Twitter Integration: Validating login.

  - by Mr. McPepperNuts

  The following code posts to twitter: NSString *compoundLoginString = [NSString stringWithFormat:@"http://%@:%@@twitter.com/statuses/update.xml",extractedUsername, extractedPassword]; NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL: [NSURL URLWithString:compoundLoginString] cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:20.0]; // The text to post NSString *msg = tweetText; [request setHTTPMethod:@"POST"]; [request setHTTPBody:[[NSString stringWithFormat:@"status=%@", msg] dataUsingEncoding:NSASCIIStringEncoding]]; NSURLResponse *response; NSError *error; if ([NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&error] != nil){ [self postSuccessfulAlert]; }else{ [self postNotSuccessfulAlert]; } I am curious as to how I could check if the username and password is correct before proceeding to the above piece of code. I found the following code in a tutorial, but am unsure how I would implement or call this function. - (void)connection:(NSURLConnection *)connection didReceiveAuthenticationChallenge:(NSURLAuthenticationChallenge *)challenge { if ([challenge previousFailureCount] == 0) { NSURLCredential *newCredential; newCredential=[NSURLCredential credentialWithUser:[self username] password:[self password] persistence:NSURLCredentialPersistenceNone]; [[challenge sender] useCredential:newCredential forAuthenticationChallenge:challenge]; } else { [[challenge sender] cancelAuthenticationChallenge:challenge]; // inform the user that the user name and password // in the preferences are incorrect NSLog(@"Invalid Username or Password"); } } Any ideas? Please note, I have taken snippets of code from both of the following tutorials. http://iphonedevelopertips.com/networking/post-to-a-twitter-account-from-the-iphone.html and http://icodeblog.com/2009/07/09/integrating-twitter-into-your-applications/

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• Practices for keeping JavaScript and CSS in sync?

  - by Rene Saarsoo

  I'm working on a large JavaScript-heavy app. Several pieces of JavaScript have some related CSS rules. Our current practice is for each JavaScript file to have an optional related CSS file, like so: MyComponent.js // Adds CSS class "my-comp" to div MyComponent.css // Defines .my-comp { color: green } This way I know that all CSS related to MyComponent.js will be in MyComponent.css. But the thing is, I all too often have very little CSS in those files. And all too often I feel that it's too much effort to create a whole file to just contain few lines of CSS - it would be easier to just hardcode the styles inside JavaScript. But this would be the path to the dark side... Lately I've been thinking of embedding the CSS directly inside JavaScript - so it could still be extracted in the build process and merged into one large CSS file. This way I wouldn't have to create a new file for every little CSS-piece. Additionally when I move/rename/delete the JavaScript file I don't have to additionally move/rename/delete the CSS file. But how to embed CSS inside JavaScript? In most other languages I would just use string, but JavaScript has some issues with multiline strings. The following looks IMHO quite ugly: Page.addCSS("\ .my-comp > p {\ font-weight: bold;\ color: green;\ }\ "); What other practices have you for keeping your JavaScript and CSS in sync?

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• How to catch HttpRequestValidationException in production

  - by bruno

  Hello all, I have this piece of code to handle the HttpRequestValidationException in my global.asax.cs file. protected void Application_Error(object sender, EventArgs e) { var context = HttpContext.Current; var exception = context.Server.GetLastError(); if (exception is HttpRequestValidationException) { Response.Clear(); Response.StatusCode = 200; Response.Write(@"<html><head></head><body>hello</body></html>"); Response.End(); return; } } If I debug my webapplication, it works perfect. But when i put it on our production-server, the server ignores it and generate the "a potentially dangerous request.form value was detected from the client" - error page. I don't know what happens exactly... If anybody knows what the problem is, or what i do wrong..? Also I don't want to set the validaterequest on false in the web.config. The server uses IIS7.5, And I'm using asp.net 3.5. Thanks, Bruno

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• ADO/SQL Server: What is the error code for "timeout expired"?

  - by Ian Boyd

  i'm trying to trap a "timeout expired" error from ADO. When a timeout happens, ADO returns: Number: 0x80040E31 (DB_E_ABORTLIMITREACHED in oledberr.h) SQLState: HYT00 NativeError: 0 The NativeError of zero makes sense, since the timeout is not a function of the database engine (i.e. SQL Server), but of ADO's internal timeout mechanism. The Number (i.e. the COM hresult) looks useful, but the definition of DB_E_ABORTLIMITREACHED in oledberr.h says: Execution stopped because a resource limit was reached. No results were returned. This error could apply to things besides "timeout expired" (some potentially server-side), such as a governor that limits: CPU usage I/O reads/writes network bandwidth and stops a query. The final useful piece is SQLState, which is a database-independent error code system. Unfortunately the only reference for SQLState error codes i can find have no mention of HYT00. What to do? What do do? Note: i can't trust 0x80040E31 (DB_E_ABORTLIMITREACHED) to mean "timeout expired", anymore than i could trust 0x80004005 (E_UNSPECIFIED_ERROR) to mean "Transaction was deadlocked on lock resources with another process and has been chosen as the deadlock victim". My pseudo-question becomes: does anyone have documentation on what the SQLState "HYT000" means? And my real question still remains: How can i specifically trap an ADO timeout expired exception thrown by ADO? Gotta love the questions where the developer is trying to "do the right thing", but nobody knows how to do the right thing. Also gotta love how googling for DB_E_ABORTLIMITREACHED and this question is #9, with MSDN nowhere to be found. Update 3 From the OLEdb ICommand.Execute reference: DB_E_ABORTLIMITREACHED Execution has been aborted because a resource limit has been reached. For example, a query timed out. No results have been returned. "For example", meaning not an exhaustive list.

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• Calling a .net webservice from a plain HTML site using jQuery

  - by pwee167

  Hi guys, I wanted to know it is possible to call a hosted .net web service from a HTML page using jQuery? I tried this piece of code, but it doesn't work for me: $('#myForm').click(function() { $.ajax({ type: "POST", data: '{}', url: "http://localhost:49590/Service.asmx?op=HelloWorld", contentType: "application/json; charset=utf-8", dataType: "json", success: function(response) { alert(response.d); }, failure: function(result) { alert(result.status + ' ' + result.statusText); } }); }); And the webservice is as such: [WebService(Namespace = "http://tempuri.org/")] [WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)] [System.ComponentModel.ToolboxItem(false)] // To allow this Web Service to be called from script, using ASP.NET AJAX, uncomment the following line. [System.Web.Script.Services.ScriptService] public class Service : System.Web.Services.WebService { [WebMethod] public string HelloWorld() { return "Hello World"; } } I have searched for this and found only examples where it is done from asp.net or asp.net mvc projects. I am not sure what I am missing but I thought this was possible from a plain HTML site with javascript, so can someone please point me in the right direction. Cheers!

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• How to output JSON from within Django and call it with jQuery from a cross domain?

  - by Emre Sevinç

  For a bookmarklet project I'm trying to get JSON data using jQuery from my server (which is naturally on a different domain) running a Django powered system. According to jQuery docs: "As of jQuery 1.2, you can load JSON data located on another domain if you specify a JSONP callback, which can be done like so: "myurl?callback=?". jQuery automatically replaces the ? with the correct method name to call, calling your specified callback." And for example I can test it successfully in my Firebug console using the following snippet: $.getJSON("http://api.flickr.com/services/feeds/photos_public.gne?tags=cat&tagmode=any& format=json&jsoncallback=?", function(data){ alert(data.title); }); It prints the returned data in an alert window, e.g. 'Recent uploads tagged cat'. However when I try the similar code with my server I don't get anything at all: $.getJSON("http://mydjango.yafz.org/randomTest?jsoncallback=?", function(data){ alert(data.title); }); There are no alert windows and the Firebug status bar says "Transferring data from mydjango.yafz.org..." and keeps on waiting. On the server side I have this: def randomTest(request): somelist = ['title', 'This is a constant result'] encoded = json.dumps(somelist) response = HttpResponse(encoded, mimetype = "application/json") return response I also tried this without any success: def randomTest(request): if request.is_ajax() == True: req = {} req ['title'] = 'This is a constant result.' response = json.dumps(req) return HttpResponse(response, mimetype = "application/json") So to cut a long story short: what is the suggested method of returning a piece of data from within a Django view and retrieve it using jQuery in a cross domain fashion? What are my mistakes above?

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• Dropdown in PHP

  - by VP

  Hi, I am using PHP 5.2 on SUN OS server. Having problems with the following piece of code that for a drop down: echo '<form action="" method="get">'; echo '<p>Information:<br />'; echo '<select name="acctno" style="width: 100px;">'; foreach ($this->account_names as $acctno => $acctname) { echo '<option value="'.$acctno.'">'.$acctname.'</option>'; } echo '</select> <input type="submit" value="view" />'; echo '</form>'; Worked perfectly fine on Firefox and Chrome; however there is a problem with Internet Explorer. In IE the dropdown width is limited to the size i.e 100px. So only the first 15-16 characters of the account name are displayed all the time. However in chrome or firefox, even if only 15-16 characters are displayed initially, when the drop down arrow is clicked upon, it show the entire name (however long it may be). This does not happen with IE. So if the account name is, lets say, "1223456789abcdefghijkl" then: For IE: shows only "123456789" all the time Ffor chrome or firefox: shows "123456789" and when it is dropped down it show the full name as "123456789abcdefghijkl". Any help here would be much appreciated. Thanks, VP

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• Help converting PHP eregi to preg_match

  - by Jason

  Hi all, I am wondering if someone could please help me convert a piece of PHP code that is now deprecated. Here is the single line I am trying to convert: if(eregi(trim ($request_url_handler[$x]),$this->sys_request_url) && $this->id_found == 0){ It is part of a function that return the configuration settings for a website. Below is the whole function. // GET CORRECT CONFIG FROM DATABASE function get_config($db) { global $tbl_prefix; $db->query("SELECT cid,urls FROM ".$tbl_prefix."sys_config ORDER BY cid"); while($db->next_record()){ $request_url_handler = explode("\n",$db->f("urls")); if(empty($request_url_handler[0])) { $request_url_handler[0] = "@"; $this->id_found = 2; } for($x=0; $x<count($request_url_handler); $x++) { if(empty($request_url_handler[$x])) { $request_url_handler[$x] = "@"; } if(eregi(trim($request_url_handler[$x]),$this->sys_request_url) && $this->id_found == 0) { $this->set_config($db,$db->f("cid")); $this->id_found = 1; } } if($this->id_found == 1) { return($this->sys_config_vars); } } $this->set_config($db,""); return($this->sys_config_vars); } Any help would be great ly appreciated. I only found the the eregi function was deprecated since I updated XAMPP to 1.7.3.

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• iPhone: Cell imageViews repeating when loaded from url

  - by araid

  I'm developing a demo RSS reader for iPhone. I obviously have a tableview to display the feeds, and then a detailed view. Some of this feeds have a thumbnail that I want to display on cell.imageview of the table, and some don't. The problem is that when scrolling the table, loaded thumbnails start repeating on other cells, and I end up with a thumbnail on every cell. Here's a piece of my code. I may upload screenshots later - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{ UITableViewCell * cell = [tableView dequeueReusableCellWithIdentifier: @"rssItemCell"]; if(nil == cell){ cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:@"rssItemCell"]autorelease]; } BlogRss *item = [[[self rssParser]rssItems]objectAtIndex:indexPath.row]; cell.textLabel.text = [item title]; cell.detailTextLabel.text = [item description]; cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator; // Thumbnail if exists if(noticia.imagePath != nil){ NSData* imageData; @try { imageData = [[NSData alloc]initWithContentsOfURL:[NSURL URLWithString:item.imagePath]]; } @catch (NSException * e) { //Some error while downloading data } @finally { item.image = [[UIImage alloc] initWithData:imageData]; [imageData release]; } } if(item.image != nil){ [[cell imageView] setImage:item.image]; } return cell; } Any help will be very appreciated.

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• C# Execute Method (with Parameters) with ThreadPool

  - by washtik

  We have the following piece of code (idea for this code was found on this website) which will spawn new threads for the method "Do_SomeWork()". This enables us to run the method multiple times asynchronously. The code is: var numThreads = 20; var toProcess = numThreads; var resetEvent = new ManualResetEvent(false); for (var i = 0; i < numThreads; i++) { new Thread(delegate() { Do_SomeWork(Parameter1, Parameter2, Parameter3); if (Interlocked.Decrement(ref toProcess) == 0) resetEvent.Set(); }).Start(); } resetEvent.WaitOne(); However we would like to make use of ThreadPool rather than create our own new threads which can be detrimental to performance. The question is how can we modify the above code to make use of ThreadPool keeping in mind that the method "Do_SomeWork" takes multiple parameters and also has a return type (i.e. method is not void). Also, this is C# 2.0.

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• Office 2003 interop problems, interface, method not found.

  - by Snake

  This problem is making me crazy. Actually I have multiple problems. First one: Why on earth are is there a _Worksheet and a Worksheetinterface in the Excel interop. They both look the same, except for some attributes on the methods. It's confusing! Second of all: my job today is making a VB.NET file more strict, by settings Option Strict On and Option Explicit On While it works for most files, I'm bumping into a problem. Here's a little code piece: Private _pivotTable As Excel.PivotTable With _pivotTable pvf = .AddDataField(pvc) End With PivotTable.AddDataField is defined on the MSDN page: http://msdn.microsoft.com/en-us/library/microsoft.office.interop.excel.pivottable.adddatafield(office.11).aspx When I check my local Interop dll w/ Reflector that method is NOT there. When I run the application, and step through it, the method just works. When I try to step INTO the method, I get an LateBound Exception. WTF? So the question is: why are the interfaces defined more than once (twice sometimes?). 2nd question. AddDataField trouble

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• Using pipes in Linux with C

  - by Dave

  Hi, I'm doing a course in Operating Systems and we're supposed to learn how to use pipes to transfer data between processes. We were given this simple piece of code which demonstrates how to use pipes,but I'm having difficulty understanding it. #include <stdio.h> #include <stdlib.h> #include <unistd.h> main() { int pipefd [2], n; char buff[100] ; if( pipe( pipefd) < 0) { printf("can not create pipe \n"); } printf("read fd = %d, write fd = %d \n", pipefd[0], pipefd[1]); if ( write (pipefd[1],"hello world\n", 12)!= 12) { printf("pipe write error \n"); } if( ( n = read ( pipefd[0] , buff, sizeof ( buff) ) ) <= 0 ) { printf("pipe read error \n"); } write ( 1, buff, n ) ; exit (0); } What does the write function do? It seems to send data to the pipe and also print it to the screen (at least it seems like the second time the write function is called it does this). Does anyone have any suggestions of good websites for learning about topics such as this, FIFO, signals, other basic linux commands used in C?

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• Azure SDK causes Node.js service bus call to run slow

  - by PazoozaTest Pazman

  I am using this piece of code to call the service bus queue from my node.js server running locally using web matrix, I have also upload to windows azure "web sites" and it still performs slowly. var sb1 = azure.createServiceBusService(config.serviceBusNamespace, config.serviceBusAccessKey); sbMessage = { "Entity": { "SerialNumbersToCreate": '0', "SerialNumberSize": config.usageRates[3], "BlobName": 'snvideos' + channel.ChannelTableName, "TableName": 'snvideos' + channel.ChannelTableName } }; sb1.getQueue('serialnumbers', function(error, queue){ if (error === null){ sb1.sendQueueMessage('serialnumbers', JSON.stringify(sbMessage), function(error) { if (!error) res.send(req.query.callback + '({data: ' + JSON.stringify({ success: true, video: newVideo }) + '});'); else res.send(req.query.callback + '({data: ' + JSON.stringify({ success: false }) + '});'); }); } else res.send(req.query.callback + '({data: ' + JSON.stringify({ success: false }) + '});'); }); It can be up to 5 seconds before the server responds back to the client with the return result. When I comment out the sb1.getQueue('serialnumbers', function(error, queue){ and just have it return without sending a queue message it performs in less than 1 second. Why is that? Is my approach to using the azure sdk service bus correct? Any help would be appreciated.

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• How do I disable the network connection from .Net without needing admin priveledges?

  - by Brad Mathews

  I may be SOL on this but I thought I would give throw it out for possible solutions. I am writing a computer access control service to help me control my kids' computer use. Plan on open sourcing it when I have it working. It is written in VB.Net and needs to work on XP through 7. I am running into all sorts of security and desktop access issues on Windows 7. The service needs to run as admin to execute the NetSh command to disable the network. But I cannot interact with the desktop from the service so I IPC to a UI to handle other stuff, but I still cannot detect from the service if the desktop is locked. Argghh! I could get it all working from a hidden windows form app if I could just lick the one piece that needs admin permissions: disabling the network. It does no good if a kid logs on and denies the popup asking if the program should run as administrator and he says no. Also windows 7 will not start a program set to run as admin using HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run Anyone know how to get this working? Or have an outside the box solution? Thanks! Brad

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• When is a>a true ?

  - by Cricri

  Right, I think I really am living a dream. I have the following piece of code which I compile and run on an AIX machine: AIX 3 5 PowerPC_POWER5 processor type IBM XL C/C++ for AIX, V10.1 Version: 10.01.0000.0003 #include <stdio.h> #include <math.h> #define RADIAN(x) ((x) * acos(0.0) / 90.0) double nearest_distance(double radius,double lon1, double lat1, double lon2, double lat2){ double rlat1=RADIAN(lat1); double rlat2=RADIAN(lat2); double rlon1=lon1; double rlon2=lon2; double a=0,b=0,c=0; a = sin(rlat1)*sin(rlat2)+ cos(rlat1)*cos(rlat2)*cos(rlon2-rlon1); printf("%lf\n",a); if (a > 1) { printf("aaaaaaaaaaaaaaaa\n"); } b = acos(a); c = radius * b; return radius*(acos(sin(rlat1)*sin(rlat2)+ cos(rlat1)*cos(rlat2)*cos(rlon2-rlon1))); } int main(int argc, char** argv) { nearest_distance(6367.47,10,64,10,64); return 0; } Now, the value of 'a' after the calculation is reported as being '1'. And, on this AIX machine, it looks like 1 1 is true as my 'if' is entered !!! And my acos of what I think is '1' returns NanQ since 1 is bigger than 1. May I ask how that is even possible ? I do not know what to think anymore ! The code works just fine on other architectures where 'a' really takes the value of what I think is 1 and acos(a) is 0.

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• Storing Arbitrary Contact Information in Ruby on Rails

  - by Anthony Chivetta

  Hi, I am currently working on a Ruby on Rails app which will function in some ways like a site-specific social networking site. As part of this, each user on the site will have a profile where they can fill in their contact information (phone numbers, addresses, email addresses, employer, etc.). A simple solution to modeling this would be to have a database column per piece of information I allow users to enter. However, this seems arbitrary and limited. Further, to support allowing users to enter as many phone numbers as they would like requires the addition of another database table and joins. It seems to me that a better solution would be to serialize all the contact information entered by a user into a single field in their row. Since I will never be conditioning a SQL query on this information, such a solution wouldn't be any less efficient. Ideally, I would like to use a vCard as my serialization format. vCards are the standard solution to storing contact information across the web, and reusing tested solutions is a Good Thing. Alternative serialization formats would include simply marshaling a ruby hash, or YAML. Regardless of serialization format, supporting the reading and updating of this information in a rails-like way seems to be a major implementation challenge. So, here's the question: Has anyone seen this approach used in a rails application? Are there any rails plugins or gems that make such a system easy to implement? Ideally what I would like is an acts_as_vcard to add to my model object that would handle editing the vcard for me and saving it back to the database.

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• How can I fix this clang warning: "Object with +0 retain counts returned to caller where +1 (owning)

  - by mipadi

  I have a piece of Objective-C code that looks like the following: - (NSString *)copyData:(NSData *)data { NSString *path = [[[self outputDirectory] stringByAppendingPathComponent:@"archive"] stringByAppendingPathExtension:@"zip"]; NSLog(@"Copying data to %@", path); [data writeToFile:path atomically:NO]; return path; } The code is called from an initializer that looks like this: - (id)initWithData:(NSData *)data { if ((self = [super init]) != nil) { NSString *path = [self copyData:data]; // Line 41 (referenced in warning, shown below) return [self initWithContentsOfFile:path]; } return self; } When running the clang static analyzer, I get the following warnings for the path variable: Potential leak of an object allocated on line 41 and stored into 'path' Object with +0 retain counts returned to caller where +1 (owning) retain count is expected I'm confused. My understanding is that stringByAppendingPathComponent should not return an autoreleased string, so it should have a net retain count of 0. (Obviously I don't want to retain it.) I've tried altering copyData: to return the following, but it didn't get rid of the warning: return [[path retain] autorelease]; So what's the deal with this warning?

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• How do I get 3 lines of text from a paragraph in C#

  - by Keltex

  I'm trying to create an "snippet" from a paragraph. I have a long paragraph of text with a word hilighted in the middle. I want to get the line containing the word before that line and the line after that line. I have the following piece of information: The text (in a string) The lines are deliminated by a NEWLINE character \n I have the index into the string of the text I want to hilight A couple other criteria: If my word falls on first line of the paragraph, it should show the 1st 3 lines If my word falls on the last line of the paragraph, it should show the last 3 lines Should show the entire paragraph in the degenative cases (the paragraph only has 1 or 2 lines) Here's an example: This is the 1st line of CAT text in the paragraph This is the 2nd line of BIRD text in the paragraph This is the 3rd line of MOUSE text in the paragraph This is the 4th line of DOG text in the paragraph This is the 5th line of RABBIT text in the paragraph Example, if my index points to BIRD, it should show lines 1, 2, & 3 as one complete string like this: This is the 1st line of CAT text in the paragraph This is the 2nd line of BIRD text in the paragraph This is the 3rd line of MOUSE text in the paragraph If my index points to DOG, it should show lines 3, 4, & 5 as one complete string like this: This is the 3rd line of MOUSE text in the paragraph This is the 4th line of DOG text in the paragraph This is the 5th line of RABBIT text in the paragraph etc. Anybody want to help tackle this?

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