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• iphone In app purchase

  - by edie

  Hi... I'm adding in-app purchase on my application. I have a view that displays information about the product and one button for purchasing the product. My question was how can I stop the user to tap again the buy button so that the StoreManager will only call my Buy method once? Because sometimes I had tapped it twice that's why two alertView shows up asking about the purchase. Should I set the button "enabled property" to no after I tap. Any suggestions that would be good about this... thanks in advance.

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• -1 as a return value

  - by dimadima

  This question is specifically about PHP, but I'm guessing it might be applicable to other languages as well. I've noticed that between PHP4 and PHP5, the designers of the language shifted away from using -1 as a return value to using constants or other forms of output. This makes sense, as -1 is not particularly evocative, and I'm guessing this practice led to confusion. That said, I am sometimes inclined to return -1 when I want to quickly add another return option to a function, and -1 often seems like a perfectly valid way to express the outcome I am coding for. So here are my questions: Is my observation generally correct, regarding the move away from -1 as a return value in PHP5 vs PHP4? What are the cons of returning -1, beyond for the reason I mentioned above, wherein the -1 return value doesn't contribute positively to code clarity?

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• Corporate Environment [closed]

  - by aloneguid

  How do you guys live in corporate environment? Especially talk to each other (developer to developer). I find it extremely hard as any question goes to "please book a meeting for that". Sometimes I get a chance to ask sb sth on the kitchen but that's it. Booked meetings are just stupidest thing ever, 'cos people talk about nothing specific and you have to wait days for them to happen. Weekly "scrums" are even more stupid as they usually take about 10 mins and you could do the same in 1 minute by email, no useful info or communication et all. All that leads to zero understanding of the product, no connection to customers, development in own isolated cubible, throwing out most of your code because that's not what was needed and you never know what the product is really aimed to do. Sad :(

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• Strange IP addresses in tomcat

  - by mdev

  Some where I have this in some generic class. public static String getRequestIp (HttpServletRequest request){ String ipaddr = request.getHeader("X-FORWARDED-FOR"); if (ipaddr == null)ipaddr = request.getRemoteAddr(); return ipaddr; } For every request i call that method and in a certain moment i insert a record in a mysql database. In most cases it works normally and i can see a record for every request with a valid ip address in the right field. But sometimes where the IP should be there is something like this. "unknown, 93.186.30.120" or "10.0.1.169, 186.38.84.3" Apache is at the front listening at port 80 and used as proxy to Tomcat that listens at port 8081. My router config would not allow to pass any conection that come by any port other than 80. Any Help? Thanks in advance.

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• Rails select list reverts to top?

  - by Danny McClelland

  Hi Everyone, I have number of select lists in my rails application like this: <li>Company<span><%= f.select :company_id, Company.all.collect {|m| [m.companyname, m.id]} %></span></li> They all work well, except - sometimes if you go to the edit view, the select list reverts to the top item, not the item that was chosen when creating. So if you go to an edit view and then click update without actually making any changes, the lists default to the top item - even though you didn't touch them. Is there a way around this? Thanks, Danny

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• How to save the world from your computer?

  - by Francisco Garcia

  Sometimes I miss the "help other people" factor within computer related careers. Sure that out there I could find many great projects improving society, but that is not common. However there are little things that we all can do to make this a better place beyond trying to erradicate annoynig stuff such as Visual Basic. You could join a cloud computing network such as World Community Grid to fight cancer. Write a charityware application such as Vim, improve an office IT infrastructure to support telecommuting and reduce CO2 emissions, use an ebook reader for saving paper... what else would you? which projects do you think can have an impact?

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• High level programming logic, design, pattern

  - by Muhammad Shahzad

  I have been doing programming from last 7 years, getting better and better, but still i think that am lacking something. I have been doing work in JOOMLA, MAGENTO, WP, Custom PHP, Opencart, laravel, codeignitor. Sometimes i need to design logic for a huge database application, in the applications we need nesting loops and queries, although i follow OOPS standards, ORM etc, still i feel i need more robust coding designs. I need to know how can i improve these things, so that code remain neat, efficient and faster. Also how big webapps like facebook twitter tests there code speed? How high level programmers choose design patterns. If you can help me find something useful with examples?

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• Custom authorize using MVC

  - by Karsten

  Im working a bit with MVC. I need to know something about roles when using the same controller for several users getting and showing pictures. I need to show pictures, but sometimes these pictures should only be shown for those who created them. So now when using the Authorize attribute and if picture and username match thrue my databse I could ofcause use this to make a match. I could ofcause make a match method in the controller. [Authorize] controllGetPicture(Picture ID){ getSomepicture.. return picture } DB relations Relations [User] <- [Pictures] ID FK_UserID Im thinking about just getting the User ID and compare with the Picture FK_UserId at the picture but I think it could be smarter. How?

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• How do I determine what branch/tag I have checked out in git?

  - by Avry

  I clone my source using git clone https://gerrit.wikimedia.org/r/p/mediawiki/core.git w/. Then I specify a specific branch/tag by doing git checkout <tag name> or git checkout origin/REL<release number>. Sometimes I forget what branch or tag I'm on. In SVN I would do a svn info to figure out what branch/tag I'm using (I realize that git has distinct definitions for branch and tag but for my purposes they are the same). How do I determine what branch/tag I am on?

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• How can I avoid "Your system is running low on virtual memory" pop-up?

  - by Xavier Nodet

  Our application sometimes uses a lot of memory, and this is expected. But when we test it under high load on Windows XP, we usually get the very annoying "Your system is running low on virtual memory" popup, and this prevents our automated, unattended, tests to run through... Is it possible to prevent this popup to appear, and just have the allocation fail? The app will handle it gracefully, and tests will go on... We are using Windows XP, but if a solution only exists on later versions, I'd be happy to know anyway.

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• Socket left in TIME_WAIT after file transfer via netcat

  - by com

  Using Copying by NetCat I am trying to copy files throught network by NetCat. From console it work pretty well. First I run listening netcat on the destination machine and after I run sending on source machine. The problem is it's doen't work from script from the source machine: ssh -f user@$desthost 'nc -l 1234 | tar xvf - /dev/null &' #listening on destination host tar cv /tmp/file | nc $desthost 1234 #sending to destination host I saw that after running port 1234 is still was open and status of the socket was TIME_WAIT. If you know what's the problem, please, help me out. And by the way, after copying how can I validate that the content is identical? Thanks! Addendum: I found one very strange thing, the same implementation with screen on destination work works, but not stable, sometimes it doesn't copy a file. ssh user@$desthost screen -dm -S test 'nc -l 1234 | tar xvf - ' #listening on destination host Maybe there is an issue with timeout?

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• Ajax JQuery responses order problem....

  - by Parhs

  Hello !!! I am searching 3 hours and didnt find anything.... i have this code which is called at an onChange event of an function group_changed(obj) { $.ajaxSetup({async:false}); $.post("/medilab/personnel/groups/getGroupRightsAjax",{ 'group.id': obj.options[obj.selectedIndex].value }, function(data){ $("#div_rights").html(data); }); } This works fine but if i set async:true sometimes the result doesnt match the selection... I guess that this is happening because some requests are lost or that the responses dont come in order..... Any idea what to do to keep it asynchronous?

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• CakePHP repeats same queries

  - by Rytis

  I have a model structure: Category hasMany Product hasMany Stockitem belongsTo Warehouse, Manufacturer. I fetch data with this code, using containable to be able to filter deeper in the associated models: $this->Category->find('all', array( 'conditions' => array('Category.id' => $category_id), 'contain' => array( 'Product' => array( 'Stockitem' => array( 'conditions' => array('Stockitem.warehouse_id' => $warehouse_id), 'Warehouse', 'Manufacturer', ) ) ), ) ); Data structure is returned just fine, however, I get multiple repeating queries like, sometimes hundreds of such queries in a row, based on dataset. SELECT `Warehouse`.`id`, `Warehouse`.`title` FROM `beta_warehouses` AS `Warehouse` WHERE `Warehouse`.`id` = 2 Basically, when building data structure Cake is fetching data from mysql over and over again, for each row. We have datasets of several thousand rows, and I have a feeling that it's going to impact performance. Is it possible to make it cache results and not repeat same queries?

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• checking boolean property in XML(Spring)

  - by Abhishek Bhandari

  I am using Spring Framework . While writing coustum SQL queries , i am unable check a parameter of boolean value. For example this is not working .. do some SQl cods The above checking is not working , it is evaluating as equal in both the cases when booleanVariable is true and false . i tried to replace compareValue ="tree" and "false". As that is a monkey work i do sometimes . is it possible to check the boolean property in XML like above .

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• issues using facebook iphone api to post image and text

  - by Joey

  I have been trying to use the facebook iphone api to publish an image and some text from my app (i.e. using FBRequest call:@"facebook.stream.publish" with the appropriate params. I've found that the behavior is extremely erratic, as it first worked fine when I implemented it, then, completely stopped working (the request would fail and nothing would show up), and now sometimes posts only the text and most of the time posts only the image in a gallery style (returning a failure). I've read that it's something broken on Facebook's side, however, I see other people's games posting things periodically with images and text and wonder if I might be doing something fundamentally different that is much less reliable or stable. Has anyone encountered such an issue or has more familiarity with this?

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• jQuery: How to stop propagation of a bound function not the entire event?

  - by Dale

  I have a click function bound to many elements. It is possible that sometimes these elements may sit within one another. So, the click event is bound to a child and also bound to its parent. The method is specific to the element clicked. Naturally, because of event bubbling, the child's event is fired first, and then the parents. I cannot have them both called at the same time because the parents event overwrites the event of the child. So I could use event.stopPropagation() so only the first element clicked receives the event. The problem is that there are other click events also attached to the element, for example, I am using jQuery's draggable on these elements. If I stop the propagation of the click event, then draggable doesn't work, and the following click events are not called. So my question is: Is there a way to stop the event bubbling of the method the event will call and not the entire event?

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• Queue access to the database to avoid multiple cache items

  - by MikeJ

  I have a music related ASP.NET web site which caches a lot of static information from the database on the first request. Sometimes, the application is reset and cache is cleared while the application is on heavy load and then all http requests go to the database to retrieve that static data and cache it for other requests. How can I ensure that only one request go to the database and cache the results, so that other request simply read that info from cache and not needlessly retrieve the same info over and over again. Can I use thread locking? For example, can I do something like lock(this) { db access here }?

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• Reason for not properly closed socket?

  - by gc

  Here is what I am trying to do: The server sends message to connected clients when new messages are available. The client, on the other hand, when connected, tries to send a message to the server using send() and then receive message using recv(), right after that, the client calls close() to close the connection. Sometimes, after the client finishes, the server tries to receive message from client will result in a 104 - "connection reset by peer" error. When this happens, Wireshark reveals that the last two segments sent by the client is: 1. an ACK acknowledging the receipt of the message sent by the server 2. a RST/ACK No FIN is sent by the client. Why is this happening and how can I close the socket "properly" at the client?

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• Catch unhandled exception of invisible thread

  - by user346804

  In my C++ application i use an activeX component that runs its own thread (or several I don't know). Sometimes this components throws exceptions. I would like to catch these exceptions and do recovery instead of my entire application crashing. But since I don't have access to its source code or thread I am unsure how it would be done. The only solution I can think of is to run it in its own process. Using something like CreateProcess and then CreateRemoteThread, unsure how it could be implemented. Any suggestion on how to go about solving this?

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• How to handle inaccurate Google Maps locations?

  - by Azzizz81

  When I type in addresses in Google maps for locations in Asia, quite a lot of them are off by more than 200 metres. For example, "blk 85 bedok north road, singapore" is off by more than 300 metres. While I don't expect Google Maps to be spot on every time, sometimes the error is too great for certain use cases. What options do I have to handle inaccurate Google Maps locations in a web app? The web app should let the user enter an address or postal code as part of an entry and I will geocode the address and store the lat-long.

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• Running sites on "localhost" is extremeley slow.

  - by seanxe

  Hello all, Having real trouble using my local host to test sites. It runs extremely slow! Sometimes up to a minute to load a page. I'm using firefox and the sites i'm testing run fine on other developers in my office local machines/ on the production server. I've gone through the normal things :- Disabled IPv6 Not running in debug mood Put the site in the highest app pool (High Isolated) on IIS 6. Taking of firewalls etc. The problem only seems to occur when hitting pages which contain some form of .net code in the code-behind. Appreciate that this a little bit of a vague topic / stab in the dark but would appreciate any sort of advice - it's horrible waiting a minute each refresh to try out a change! Cheers, Sean.

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• [CA_COLOR_OPAQUE] things that make a layer non-opaque. scaled CAGradientLayer?

  - by mahal tertin

  i spent some time with the environment variable CA_COLOR_OPAQUE = 1 and have my findings to share. things that make a CALayer non-opaque (slow, more memory, ...): * contents with alpha (like an NSImage with an icon) * NSImage/CGImage from a pdf as contents (even when the pdf does not contain any alpha and opaque=YES) * backgroundColor = nil * CATextLayer with text in a (because it is contents with alpha) * rounded corners? maybe/sometimes * masksToBounds? not necessarily as we scale most of tree with CATransform3DScale on sublayerTransform i found also these rather irritating non-opaque: * CAGradientLayer that is somewhere down in this scaled tree (even when set all the gradient colors without alpha) * edgeAntialiasingMask != 0 of a layer that is somewhere down in this scaled tree the last two do not make sense to me. why should it be non opaque? what do i see? if anyone has any thoughts on these findings, i'm happy to learn as i couldn't find such a list yet.

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• Resolve HTTP 304 - not modified in AJAX call made via GWT

  - by Salvin Francis

  We are using an application made in GWT with the server as tomcat. The project runs fine normally, however there are situations where the server is restarted. At such point of time, the ajax call made by the code below returns blank text with the status code as 304 RequestBuilder requestBuilder = new RequestBuilder(RequestBuilder.POST, URL.encode(serverUrl)); //-- serverUrl is the url to which this call is posted to. requestBuilder.setHeader("Content-Type", "application/x-www-form-urlencoded"); requestBuilder.setHeader("Expires","0"); requestBuilder.sendRequest( postData, new RequestCallback() { public void onError(Request request, Throwable exception) { //Do nothing } public void onResponseReceived(Request request, Response response) { //sometimes when the server is restarted, I get response.getStatusCode() = 304 and the response.getText() as blank } } ); normally we get back some data from the server inside this response text. How do we now get the data when the response itself is blank ?

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• Preventing Race Conditions

  - by Qua

  I'm using the built-in ajax functionality of MVC2. Basically the user types a search query, and on every key press a set of results for the query is shown. This works fine in almost all cases, but sometimes the server is a bit slow with a single response, and thus the result for the next key stroke is returned before the previous. When the previous key stroke result set is finally returned to the client it will overwrite the results for the newer search query that should actually have been shown. My code follows more or less along these lines: <% using (Ajax.BeginForm("SearchUser", null, new AjaxOptions() { UpdateTargetId = "findUserResults" }, new { id = "findUserAjaxForm" })) {%> Every keystroke submits this form and thus outputs the results in the 'findUserResults' element. How can I prevent older results from being displayed while still making use of the built-in functions provided in MVC2?

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• Is it possible to tie a subscription to a iTunes account with in-app purhcase?

  - by erotsppa

  We're trying to implement a subscription service with in-app purchase in our app. The problem is our service does not require a user account for the past year of service. Users simply use this service with advertisements shown. We want to give them a subscription where they can buy for say, 3 months to have the advertisement removed. How can this be done? We'll have to make it a consumable because it is a subscription. But we wouldn't know when the subscription end. We can't save the state locally because the user might reinstall the app We can't save the state on the server and tie it to their device because sometimes the user changes device We don't have a user account to tie the subscription to and we don't want to introduce a user account system which spoils the experience. Is there some way of associating the purchase with their iTunes account? So that it is carried with them when they reinstall or changes device?

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