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• How to use AVCaptureSession to stream live preview video, then take a photo, then return to streaming

  - by Matthew

  I have an application that creates its own live preview prior to taking a still photo. The app needs to run some processing on the image data and thus is not able to rely on AVCaptureVideoPreviewLayer. Getting the initial stream to work is going quite well, using Apple's example code. The problem comes when I try to switch to the higher quality…

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• who free's setvbuf buffer?

  - by Evan Teran

  So I've been digging into how the stdio portion of libc is implemented and I've come across another question. Looking at man setvbuf I see the following: When the first I/O operation occurs on a file, malloc(3) is called, and a buffer is obtained. This makes sense, your program should have a malloc in it for I/O unless you actually use…

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• Why does rebase cause commit conflicts?

  - by llm

  Could somebody please explain to me why people warn about commit conflicts occuring from a rebase operation? I tried reading about this by searching google but had some trouble understanding. If it matters, I am using ClearCase revision control.

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• Hexadecimals in python

  - by ryudice

  I don't know python and I'm porting a library to C#, I've encountered the following lines of code that is used in some I/O operation but I'm not sure what it is, my guess is that it's a hexadecimal but I don't know why it's inside a string, neither what the backslashes do? sep1 = '\x04H\xfe\x13' # record separator sep2 =…

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• wpf: usercontrol vs. customcontrol performance issue

  - by viky

  Which one is better from performance view user control or custom control? Right now I am using user control and In a specific scenario, I am creating around 200(approx.) different instances of this control but it is bit slow while loading and I need to wait atlest 20-30 second to complete the operation. What should I do to…

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• How to query through a DBRef in MongoDB/pymongo?

  - by Soviut

  Is it possible to query through a DBRef using a single find spec? user collection { 'age': 30 } post collection { 'user': DBRef('user', ...) } Is it possible to query for all post who's users are 30 in a single find step? If not, would it be wise to create a javascript function to handle the multi-stage…

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• If I'm updating a DataRow, do I lock the entire DataTable or just the DataRow?

  - by Dan Tao

  Suppose I'm accessing a DataTable from multiple threads. If I want to access a particular row, I suspect I need to lock that operation (I could be mistaken about this, but at least I know this way I'm safe): // this is a strongly-typed table OrdersRow row = null; lock (orderTable.Rows.SyncRoot) { row =…

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• KissXml on iPhone

  - by zp26

  Hi, I have dowload a KissXml project. I must add all the files to my project (excluding DDXMLTesting). Sorry for the stupid question but i must insert all class in the classes folder (http://ixhan.com/2010/03/tutorial-of-kissxml-iphone/) or i can do another operation. Sorry but i'm a beginner programmer for…

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• Change table columns width on resizing window or splitter

  - by Narek

  Consider there is a QTablWidget and a QTextEdit. Both of them are in a horisontal QSplitte. Let the QTable widget has 2 columns. The problem is to resize the table columns' width as you do resize operation by moving the splitter with mouse. Are there any options to may colums to be resized synchornosly…

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• how to calculate bitwise OR using AND, XOR and shift?

  - by Flavius

  Hi The question seems pretty well formulated I have a virtual machine which implements only AND, XOR, SHL and SHR, yet I have to do a "OR 0x01" operation.

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• How to do validation on both client and server side for a service which is a store procedure(return a complex type)

  - by Tai

  Hi I am doing Silverlight 4 In my database, I have a store procedure(having two parameters) which returns rows (with extra fields). So i have to make a complex type for those rows on my Models. And Making a service to call that function import store procedure. The RIA will automatically create a…

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• NSURLConnection Error

  - by Biranchi

  Hi All, What is "Error Domain=NSURLErrorDomain Code=-1020 UserInfo=0x1694a0 "Operation could not be completed. (NSURLErrorDomain error -1020.)"" due to ??

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• Suggest me ,is it a good idea to make changes in default Joomla code structure?

  - by Parth

  Suggest me, is it a good idea to make changes in default Joomla code structure? I need to keep an insert query after every insert/update/delete operation in Joomla administrator code. so that i can track the change i have made. Is it good idea to make the changes every where in the default code…

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• How can I select the pixels from an image in opencv?

  - by ajith

  This is refined version of my previous question. Actually I want to do following operation... summation for all k|(i,j)?wk [(Ii-µk)*(Ij-µk)], where wk is a 3X3 window, µk is the mean of wk, Ii & Ij are the intensities of the image at i and j. I dont know how to select Ii & Ij separately…

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• ReverseGeoCoder Fail Error in Mapkit

  - by Biranchi

  Hi All, I am making the ReverseGeoCoder request with the following latitude and longitude Latitude = 37.296740 Longitude = -122.001878 I am getting an error as "/SourceCache/ProtocolBuffer/ProtocolBuffer-19/Runtime/PBRequester.m:446 server returned error: 503" With the ReverseGeoCoder fail…

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• Range subtraction in the Excel Object Model

  - by mcoolbeth

  When using Excel Interop libraries from .NET, I can find a Range object representing the cell offset from Range X by calling something like. Range Y = X.Range[2,3]; But what should I do to perform the inverse operation, ie: I have two Range objects, A and B, and I would like to find out by…

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• Problem with SQL, ResultSet in java

  - by aphex

  How can I iterate ResultSet ? I've tried with the following code, but i get the error java.sql.SQLException: Illegal operation on empty result set. while ( !rs.isLast()) { rs.next(); int id = rs.getInt("person_id"); …

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• Add information through a stored procedure and PHP?

  - by theband

  I have a form which contains a lot of elements, my DB guy has generated an SP and now i need to call that stored procedure. My form has twenty elements, when i click on submit the data must be saved in database. I know how to do this on insert query, but how to call an SP and…

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• Marshalling polymorphic objects in JAX-WS

  - by pkchukiss

  I'm creating a JAX-WS type webservice, with operations that return an object WebServiceReply. The class WebServiceReply itself contains a field of type Object. The individual operations would populate that field with a few different data-types, depending on the operation. …

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• Where to put a glossary of important terms and patterns in documentation?

  - by Tetha

  Greetings. I want to document certain patterns in the code in order to build up a consistent terminology (in order to easen communication about the software). I am, however, unsure, where to define the terms given. In order to get on the same level, an example: I have a…

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• Update local sqlite database from Adobe AIR application

  - by Kiran

  I have a local sqlite database which is created by an IE addon. The sqlite database cannot be updated from a Adobe AIR application which I use as a frontend. The exception is as follows SQLError:'Error #3132:Datatype type mismatch.',details:'could not convert floating…

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• Channel time out error when trying to use wcf service in asp.net application

  - by stackuser1

  The request channel timed out while waiting for a reply after 00:00:59.9970702. Increase the timeout value passed to the call to Request or increase the SendTimeout value on the Binding. The time allotted to this operation may have been a portion of a longer timeout.

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• Problem in retrieving the ini file through web page

  - by MalarN

  Hi All, I am using an .ini file to store some values and retrieve values from it using the iniparser. When I give (hardcode) the query and retrive the value through the command line, I am able to retrive the ini file and do some operation. But when I pass the…

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• May I open my own device driver twice simultanoiusly from a user program under Linux?

  - by Viktor Gyuris

  Somewhere I read that opening the same file twice has an undefined semantics and should be avoided. In my situation I would like to open my own device multiple times associating multiple file descriptors to it. The file operations of my device are all safe. Is…

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• Bitwise Operations -- Arithmetic Operations..

  - by RBA

  Hi, Can you please explain the below lines, with some good examples. A left arithmetic shift by n is equivalent to multiplying by 2n (provided the value does not overflow), while a right arithmetic shift by n of a two's complement…

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