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• how to avoid storing several times a repeated field of a Symfony form?

  - by user454760

  Hello everybody, I am working with Symfony 1.4 and Doctrine. I have a model A with an email field. The form of A displays an input in which the user should insert the email correctly. But as everybody knows, sometimes they don't do it. To fix this I have inserted an extra field in the model (and in the form), called *repeat_email* to prevent the misspellings. Then, in the validation process, after validating all the fields, i use a global validator to compare the data of the two fields. This works, but I don't want to have the email stored two times in the database (I don't want the *repeat_email*). Is there any mechanism to use it in the validation process, but not to store it in the database? Thanks,

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• How do you ensure a mimetype in asp.net?

  - by Sem Dendoncker

  Hello, I have the following code to export a zip file: byte[] buffer = FileUtil.FileToByteArray(zipLocation, true); // push the memory data to the client. _ctx.Response.ContentType = "application/zip"; _ctx.Response.AddHeader("content-disposition", String.Format("attachment; filename={0}", String.Format("map{0}.zip", mapId))); _ctx.Response.BinaryWrite(buffer); This code works great. After every export I get a perfectly made zipfile. The problem however is that when I try to import it, the mimetype sometimes is "application/empty". Now I wonder how can I ensure that the mimetype is always added? Cheers, M.

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• Computer/Application having trouble and getting slow while accessing Sql server through LAN, Network is fine

  - by user614297

  Hi, I have an web project in asp.net in one of my computers which are connected internally through LAN. The database is in Sql Server kept in another computer. The LAN is connected well. There is no connection error in my programming also. But sometimes in this particular system the page is taking long time to be open, sometime it is showing some exceptions(not everytime again and again). What can be the problem? How can it be solved? The same project is running good in other computers as well. My network seems ok, as I can acccess the computer hosting SQL server.

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• Catching uncaught exceptions

  - by kajyr

  Hi everybody. In my workplace we are mantaining a lot of ecommerce websites, some coded better than others. On some of those, sometimes uncaught exceptions are thrown, and showed by the alertbox from the flash player debug (If you have it installed). To rise the average user experience I'd like to report all those exceptions throught a in house tool we already have. Is there a way to catch those exceptions? Maybe the flash player debug exposes them to javascript, or in some other way.

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• Should I use multiple threads in this situation? [Ruby]

  - by mr popo

  I'm opening multiple files and processing them, one line at a time. The files contain tokens separating the data, such that sometimes the processing of one file may have to wait for others to catch up to that same token. I was doing this initially with only one thread and an array indicating with true/false if the file should be read in the current iteration or if it should wait for some of the others to catch up. Would using threads make this simpler? More efficient? Does Ruby have a mechanism for this?

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• Throw blank even-numbered/left pages

  - by TimGJ

  I am trying to typeset a large document using ReportLab and Python 2.7. It has a number of sections (about 6 in a 1,000 page document) and I would like each to start on odd-numbered/right-hand page. I have no idea though whether the preceding page will be odd or even and so need the ability to optionally throw an additional blank page before a particular paragraph style (like you sometimes get in manuals where some pages are "intentionally left blank"). Can anyone suggest how this could be done, as the only conditional page break I can find works on the basis of the amount of text on the page not a page number. I also need to make sure that the blank page is included in the PDF so that double-sided printing works.

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• How long people take to learn a new programming language?

  - by Cawas

  In general aspects, this might be a good reference for everyone. Having an idea of how long people take in average for properly learning how to code can give a very good idea on how dense or long is the path. Someone who never programmed should take weeks or months, even years maybe while someone who's already experienced in the area and know at least 2 different languages might take days, hours or even minutes to start coding. But other than being able to write code that runs, there are ways to write the same program, and it's much harder to get deep knowledge on that than actually being able to program. And sometimes languages differ a lot from one to another on that aspect as well. For instance, we should never have to worry with code-injection in JavaScript like we do in C. So, is there any place we can see some good numbers for how long it takes to learn a language, maybe divided into level of knowledge categories, languages and paradigms, etc?

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• Hiding dropdown list when list is empty

  - by Amina

  I currently have a dropdown list that is populated on page load and sometimes the dropdown list doesn't contain anything and is empty. I would like the hide the dropdown list whenever there aren't any items in the list. I thought i could do this via javascript but i am not sure what i could be doing wrong because after adding the javascript it stills appear on the page. dropdown select: <select data-bind="options: endReason() ? endReason().SubReasons : [], value: subReasonId, optionsText: 'Text', optionsValue: 'Value', visible: isChecked" name="subReasons"> </select> This is my Javascript: <script type="text/javascript"> function OnClientDropDownOpening(sender, eventArgs) { var combo = $find("<%= subReasons %>"); items = combo.get_items(); if(items.get_count()==0) { eventArgs.set_cancel(true); } } </script>

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• How to start SQL Server in a remote machine using code from Delphi?

  - by MLB

  Hi there: I am developing an application (Delphi 7, windows XP) that uses a connection to a remote SQL Server. Sometimes, that server is down, and I want to do something to start it. I was trying to start SQL Server in a local context, and it was fine, it worked... But the point is that I have to start it up from a remote machine. I can see SQL Server status from a remote server, but I can't start it up... Maybe it gets problems because of user and password, but where to specify the login to the remote machine? Do you have any idea to do this??? I am sorry about my English. Thanks.

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• WMI instrinsic events. Resources

  - by Nickolodeon

  Hi. I subscribe to usb inserted event like this select * FROM __INSTANCECREATIONEVENT WITHIN 3 WHERE TARGETINSTANCE ISA Win32_DiskDrive After inserting usb flash it blinks every 3 seconds. This is polling interval and intrinsic events work by polling object that's in query. Now, we know these types of events may be resource expensive. (Putting value greater then 3 sometimes chokes these events and client program doesn't get notified). Are there other ways to do that, so that usb doesn't get scanned all the time? May be there some extrinsic events available? Right now the only solution I see is to unsubscribe from event above once it trigerred and resubscribe to it in __INSTANCEDELETIONEVENT handler. Hm, althought deletionevent will also poll diskdrive controllers(

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• Question about custom events

  - by Malfist

  I'm making custom events for C# and sometimes it isn't working. This is how I'm making the event happen: private bool isDoorOpen; public bool IsDoorOpen { get { return isDoorOpen;} private set { isDoorOpen = value; DoorsChangeState(this, null);} } And these are the event declarations: //events public delegate void ChangedEventHandler(Elevator sender, EventArgs e); public event ChangedEventHandler PositionChanged; public event ChangedEventHandler DirectionChanged; public event ChangedEventHandler BreaksChangeState; public event ChangedEventHandler DoorsChangeState; This works as long as there are methods attached to the events, but if there isn't, it throws a null ref exception. What am I doing wrong?

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• Beside SVN, how do you manage your development vs test vs production source code?

  - by medopal

  I'm working on a very large project with three phases of source code. Development source code: changes rapidly every second, and checked by our QA Test environment code: released to clients' QA department (released every 2-3 weeks) Production environment: after confirmed ok by client QA its released to prod. (every few months) The system (governmental web app) is very large to track changes,bugs and hot fixes, sometimes the Testers could ask for a change, some other times the Production could ask for a hot fix or small update. The problem is, when the Test or Production request changes, the development code is already changed a lot, and they always warn us they want only that small fix, do not upload anything new with it. The question, how should i manage the code for the 3 phases, and get back to Test or Production code any tie and fix that small one thing (reflecting the change to the current Development as well)? Note: making a branch each time is too much, and i don't want the developers to be lost between updating the mainstream, the branch and the Test code!

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• While programming, what to do when facing with a seemingly unsolvable situation with a time limit?

  - by Ersan Tasan

  This is not a technical question, but rather a social and methodical one. I am a computer sciences student and I usually have really tough programming assignments. I don`t know if it is only happening to me but sometimes, particularly when deadline is approaching, i find myself in a harsh situation. I cannot find my mistake in the code or come up with a another great idea. Then boredom comes in and the problem begins to seem unsolvable. I know there are more-than-great professional coders here. I would like to learn their ideas to cope with this situation. Is it better to focus on something else for a while and try again or try harder and harder and look for the solution on the net etc...

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• Safe way of iterating over an array or dictionary and deleting entries?

  - by mystify

  I've heard that it is a bad idea to do something like this. But I am sure there is some rule of thumb which can help to get that right. When I iterate over an NSMutableDictionary or NSMutableArray often I need to get rid of entries. Typical case: You iterate over it, and compare the entry against something. Sometimes the result is "don't need anymore" and you have to remove it. But doing so affects the index of all the rows, doesn't it? So how could I safely iterate over it without accidently exceeding bounds or jumping over an element that hasn't been checked?

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• What scenarios/settings will result in a query on SQL Server (2008) return stale data

  - by s1mm0t

  Most applications rarely need to display 100% accurate data. For example if this stack overflow question displays that there have been 0 views, when there have really been 10, it doesn't really matter. This is one way that the (perceived) performance of applications can be improved, by caching results and therefore sometimes not showing 100% accurate results. There are some cases where the data does need to be 100% accurate though. So if I run the query select * from Foo I want to be sure that the results are not stale. Now depending on how my database is set up, other activity on the database, use of transactions and isolation levels etc this query may or may not be a true reflection of the world. What scenario's and settings can people think of that will result in this query returning stale results or given that another connection is part way through a transaction that has updated this table, how can I guarantee that when the above query returns, the results will be accurate.

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• Loading Nested JS Files on the Page

  - by Aidin

  Hi, I have a JS file that is dependent to another Js file. this Js file is something like this (Common.js) //Some codes here window.onload = PageLoad; //some codes here and then I implement PageLoad function in another Js file. ( I do this because every page has its own PageLoad implementation) and I Load these files like this on my Main.aspx : `<asp:Content ID="Content1" ContentPlaceHolderID="ContentPlaceHolder1" Runat="Server">` `<\script language="javascript" type="text/javascript" src="PagesJS/pgeMain.js"></script>` `<\script language="javascript" type="text/javascript" src="JS/Common.js"></script>` ... ... `</asp:Content>` Every thing works fine on local but when I deploy it, sometimes I get PageLoad undefined Error! Can any one tells me what is wrong with this? Thanks. Aidin

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• Outlook AppointmentItem Write Event - how many times does it execute

  - by marcincoles

  I need to perform some activity when an appointmentitem (or specifically a meeting) is saved. What I want is once the user has filled in the info and clicks 'send', Outlook does it's stuff and my code executes once. However what I'm finding, is that the Write event occurs multiple times - at least twice, sometimes more (eg in updates). Where this is an issue for me, is that I have an object that needs to be updated before it's serialized, and I don't want to be doing the update and serialization multiple times. Has anyone come across this issue, before and is there a better way to do this to use than appointmentitem.write?

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• global counter in application: bad practice?

  - by Martin

  In my C++ application I sometimes create different output files for troubleshooting purposes. Each file is created at a different step of our pipelined operation and it's hard to know file came before which other one (file timestamps all show the same date). I'm thinking of adding a global counter in my application, and a function (with multithreading protection) which increments and returns that global counter. Then I can use that counter as part of the filenames I create. Is this considered bad practice? Many different modules need to create files and they're not necessarily connected to each other.

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• Django: IE doesn't load locahost or loads very SLOWLY

  - by reedvoid

  I'm just starting to learn Django, building a project on my computer, running Windows 7 64-bit, Python 2.7, Django 1.3. Basically whatever I write, it loads in Chrome and Firefox instantly. But for IE (version 9), it just stalls there, and does nothing. I can load up "http://127.0.0.1:8000" on IE and leave the computer on for hours and it doesn't load. Sometimes, when I refresh a couple of times or restart IE it'll work. If I change something in the code, again, Chrome and Firefox reflects changes instantly, whereas IE doesn't - if it loads the page at all. What is going on? I'm losing my mind here....

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• mysql query takes 145 seconds

  - by suomee

  I have a a mysql db with myisam engine. Along with many other table I have this table "et" which has around 8137037 records. I have created indexes (individual index of column hname and pnum, it did not help much later created joint index of hname and pnum and it help execute within a second)such that queries like "select st from et where hname='name' and pnum='1' limit 1;" execute fast (with in a second) but the problem is I must execute this query "select st from et where hname='name' and pnum='1' order by id limit 1" where id is the primary key of the table and this query sometimes take 145 seconds :( how can i resolve this issue?

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• memory access violation error - 0xC0000005

  - by nobody

  I got memory access violation error sometimes.... but I don't know where the error comes from... So I reviewed the code and I found some strange code... delete m_p1; A *a = new A(); a->b = *c; m_p1 = a; --> strange code. I think it's a little strange line.... can i use the m_p1 after delete the m_p1? It can make some memory access error??

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• this pointer to base class constructor?

  - by Rolle

  I want to implement a derived class that should also implement an interface, that have a function that the base class can call. The following gives a warning as it is not safe to pass a this pointer to the base class constructor: struct IInterface { void FuncToCall() = 0; }; struct Base { Base(IInterface* inter) { m_inter = inter; } void SomeFunc() { inter->FuncToCall(); } IInterface* m_inter; }; struct Derived : Base, IInterface { Derived() : Base(this) {} FuncToCall() {} }; What is the best way around this? I need to supply the interface as an argument to the base constructor, as it is not always the dervied class that is the interface; sometimes it may be a totally different class. I could add a function to the base class, SetInterface(IInterface* inter), but I would like to avoid that.

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• PHP --> SQL Server + Excel file upload from a specific row

  - by lucky

  I have a requirement in which, i need to upload an excel file into SQL Server database. It is working well till this point. But sometimes i am getting excel file in such a way, that the first 2 rows and columns are empty rows. That is not even fixed every time. so the format of the table after upload is not as expected. It is assigning F1, F2 as column names for the table in SQL Server. It varies from file to file. I want to program it in such away so that the user can enter the row number and the column number from where the actual data is starting. So that while upload it should from line 3 and column 2. I don't know how to specify that row and column while uploading. Please help me to solve the same.

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• Merging $.get and $.ready

  - by cwolves

  Put simply I have an ajax call that sometimes completes before the page is loaded, so I tried wrapping the callback in $( fn ), but the callback doesn't fire if the page is loaded... Anyone have a good solution to this? $.get( '/foo.json', function( data ){ $( function(){ // won't get here if page ready beats the ajax call // process data $( '.someDiv' ).append( someData ); } ); } ); And yes, I know that if I flipped the order of those it would always work, but then my ajax calls would be needlessly deferred until the document is ready.

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• batch execute from mysql

  - by user3737088

  I need an interface for my web interface to bat files automatically temporarily to build and run. The contents of the file should come from a table in a MySQL database. It is so no matter what is in the table, the interface should run it. The web interface is based on the PHP version 5.5.6. Try and experiment After 3 months, I'm at the end and I have no ideas more. Has anyone an idea? Windows 2008 R2 IIS7 web server Full access EDIT: The batch files run through not only short. They sometimes run 1 week and longer.

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