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• What is a good metaphor for c memory management?

  - by fsmc

  I'm trying to find a good metaphor to explain memory allocation, initialization and freeing in c to a non technical audience. I've heard pass-by-reference/value talked about quite well with postal service usage, but not so much for allocation/deallocation. So for I've thought about using the idea of renting a space might work, but I wonder if the SO crew can provide something better.

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• How do I find the speed of an in-progress file upload in cURL?

  - by cinek1lol

  I'd like to know how to check out the speed of a file being uploaded in real time using the cURL library in C++. This is what I have written: void progress_func(void* ptr, double TotalToDownload, double NowDownloaded, double TotalToUpload,double NowUploaded) { cout<<NowUploaded<<endl; } //... int main() { //... curl_easy_setopt(curl, CURLOPT_PROGRESSFUNCTION, progress_func); } But the manual says that it shows average speed, but even this doesn't seem to work with me, because too mach fast is end. How to good write or A well-calculated?

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• Session vs singleton pattern

  - by chobo

  Hi, I have a web application where I would like to pull user settings from a database and store them for Global access. Would it make more sense to store the data in a Singleton, or a Session object? What's the difference between the two? Is it better to store the data as an object reference or break it up into value type objects (ints and strings)? Thanks!

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• Waiting for a subset of threads in a Java ThreadPool

  - by David Semeria

  Let's say I have a thread pool containing X items, and a given task employs Y of these items (where Y is much smaller than X). I want to wait for all of the threads of a given task (Y items) to finish, not the entire thread pool. If the thread pool's execute() method returned a reference to the employed thread I could simply join() to each of these Y threads, but it doesn't. Does anyone know of an elegant way to accomplish this? Thanks.

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• Iterating through struct fieldnames in MATLAB.

  - by Noio

  My question is easily summarized as: "Why does the following not work?" teststruct = struct('a',3,'b',5,'c',9) fields = fieldnames(teststruct) for i=1:numel(fns) fns(i) teststruct.(fns(i)) end output: ans = 'a' ??? Argument to dynamic structure reference must evaluate to a valid field name. Especially since teststruct.('a') does work. And fns(i) prints out ans = 'a'. I can't get my head around it.

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• XML allows for external entities; what about XHTML?

  - by xtofl

  This question about web page 'inclusion' triggered my curiosity. The XML allows you to specify a reference to an 'external' portion. Can you do the same in XHTML, then? XML example: <!ENTITY foo SYSTEM "http://www.mydomain.com/logo.gif" NDATA GIF87A> ... <SOMETHING>&foo;</SOMETHING>

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• Where the Stack variable stores ( Data segment or Heap or BSS) ?

  - by SIVA

  Some people are saying " stack variable store its value in HEAP ", and others saying " stack variable store store its value in DATA segment". I am totally confused with these conflict answers. Where exactly static variable stores?. I am expecting an answer with standard reference ( text books, or good author tutorial).

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• Does the iPhone 3G/3Gs camera put metadata in its images? (and how do you get it?)

  - by Ben Collins

  I've been trying to figure how whether the iPhone (either 3G or 3Gs) camera puts metadata into it's images. Anecdotally, it appears that it does (e.g., I've seen images posted on the web that included a bunch of metadata), but I can't find reference to it anywhere in the SDK documentation. So....does anyone have a definitive answer? Also, if there is metadata, how do I get at it?

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• Configuration of Application (MVC)

  - by Felipe

  Hi all. I have an application in asp.net mvc 2, and in this application, there are some parts that need to obey an configuration, for example. The app has an document management and the number of document (a field of my domain), need to be manual or automatic, and this choise will be consider in configuration. So, is there any pratice to do this? Need I render the number field (with hidden fields) in my View or it's not necessary? ViewData["key"] is recommended to make the form ? Thanks! Cheers

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• Why doesn't Microsoft.SqlServer.Smo appear in the Add References dialog

  - by Sisiutl

  I have used Microsoft.SqlServer.Smo.dll and Microsoft.SqlServer.ConnectionInfo.dll in a number of VS2008 projects but they don't appear in the VS2010 Add Reference dialog. Why did they disappear and how can I add them to my VS2010 project?

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• Java PreparedStatement Throws MySQLSyntaxErrorException

  - by sqlBugs

  I have the following Java code: String query = "Select 1 from myTable where name = ? and age = ?"; PreparedStatement stmt = conn.prepareStatement(query); stmt.setString(1, name); stmt.setInt(2, age); ResultSet rs = stmt.executeQuery(); Whenever I run the above code, it throws an exception on line 2 (where the PreparedStatement is declared): Error 0221202: SQLException = com.mysql.jdbc.exceptions.MySQLSyntaxErrorException: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '? AND age = ?' at line 1 Does anyone have any suggestions about what I am doing wrong? Thanks!

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• Changing website favicon dynamically

  - by rwmnau

  I have a web application that's branded according to the user that's currently logged in. I'd like to change the favicon of the page to be the logo of the private label, but I'm unable to find any code or any examples of how to do this. Has anybody successfully done this before? I'm picturing having a dozen icons in a folder, and the reference to which favicon.ico file to use is just generated dynamically along with the HTML page. Thoughts?

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• Why must initialization value of field members be determinable at compile time?

  - by flockofcode

  1) Why must initialization value of field members be determinable at compile time? 2) But if the initialization value needs to be determined at compile time, then why am I able to initialize a A.b field using a reference to an object: class A { B b = new B(); } class B {} Thank you

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• Error 401 when login twitter by twitter4j

  - by user1060362

  I am doing an app android to login and upload photo to twitter. I used twitter4j to login and reference some tutorial..I extract that consumer key and consumer secret key are filled correct.But I encountered an error"401: Authentication credential...".Have a solution to fix it is sync time my server with time twitter server..But I don't understand what sync time here and how to extractly.. Can you help me.

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• MySQL COUNT help

  - by space

  I'm trying to count all the ids form table3 that are related to the first two tables but I think my SQL code is wrong can some one help me fix it? Here is the code: $dbc = mysqli_query($mysqli,"SELECT table1.*, table2.*, COUNT(id) as num, table3.id FROM table1 INNER JOIN table2 ON table1.id = table2.id INNER JOIN table3 ON table2.id = table3.id WHERE table2.id = '$id'"); Here is the error message. Mixing of GROUP columns (MIN(),MAX(),COUNT(),...) with no GROUP columns is illegal if there is no GROUP BY clause You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '' at line 4

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• Sharepoint 2010 - Managed KeyWords

  - by Audioillity

  Hi, Is it possible to import managed keywords into SharePoint 2010? Where are the keywords stored within which database? Background - I'm currently working on a migration from a legacy system into SharePoint 2010. So far everything is going well, and I can even bring across the managed meta data across along with most other data. The process I use was built for SharePoint 2007 to update Lists over SOAP. With a few manual tweaks I've managed to get the metadata to come across. To bring across either managed metadata or managed keywords I need to know the ID for the existing label/keyword. I have this for the Managed Metadata however not for the Managed Keyword. Currently I create a CSV file to be imported for managed metadata before working out the reverent GUID for the source label. Many Thanks Luke

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• Why can't i define recursive variable in code block?

  - by senia

  Why can't i define a variable recursively in a code block? scala> { | val fibs: Stream[Int] = 1 #:: fibs.scanLeft(1){_ + _} | } <console>:9: error: forward reference extends over definition of value fibs val fibs: Stream[Int] = 1 #:: fibs.scanLeft(1){_ + _} ^ scala> val fibs: Stream[Int] = 1 #:: fibs.scanLeft(1){_ + _} fibs: Stream[Int] = Stream(1, ?) lazy keyword solves this problem, but i can't understand why it works without a code block but throws a compilation error in a code block.

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• What happened to the CSS Checker tool?

  - by Kyle Sevenoaks

  I used it before, and was reminded of it when someone asked about a tool to strip unsused CSS from a stylsheet. I went back to the link, but it's gone, what happened to it? Is it gone forever or does anyone know of a backup? Or a similar tool that can still check your CSS against the HTML and strip orphan CSS. Thanks. Link (to broken site for reference).

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• Tracking Ip address and country name(asp.net)?

  - by Surya sasidhar

  hi, Yesterday i saw a site in which, site is listing the ip address and country name, saying that recently visited members (a list of ip address with country name,city name). Can i know how can i track that information any reference or any code. Thank You.

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• how can i change texts in the dynamic textFields in SimpleButton instance (button symbol)?

  - by sasi

  hi every one, this may be a basic thing, but i couldn't find an answer by serching internet. I have created a simple button - Istance name = "btnsample" and there are two layers layer 0- button design with rollovers - layer 1- dynamic text field - instance name = "txtbtnlabel" btnsample.txtbtnlabel.text = "new button label; but it's giving followin error :-119:Access of possible undefined propety txtbtnlabel through a reference with static type flash.display:simpleButton. how to solve this problem?

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• Extended MAPI: How to get the entry ID of messages moved by CopyMessages

  - by marijne

  I have found that if I move a message using IMAPIFolder::CopyMessages (using the MESSAGE_MOVE flag) the message gets a new entry ID. However I do not see any reliable way of getting the entry ID of the message in its new location, or otherwise getting a reference to it. The best suggestion I have had so far involves tagging the message with the old custom property before moving, and then doing a search afterwards, but I was wondering if there is a less convoluted solution.

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• Error when creating database in MySQL using Netbeans 6.8

  - by nix

  I am trying to create a database using MySQL statements in NetBeans 6.8. However, I keep getting Error code 1064. I don't know what the problem is really since the same statements work in NetBeans 6.0. Here is the error: Error code 1064, SQL state 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '; /*!40000 ALTER TABLE students ENABLE KEYS */; -- -- Definition of table `w' at line 1016 Line 46, column 1

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• callback pattern

  - by robUK

  Hello, gcc 4.4.3 c89 I am creating a client server application and I will need to implement some callback functions. However, I am not too experienced in callbacks. And I am wondering if anyone knowns some good reference material to follow when designing callbacks. Is there any design patterns that are used for c. I did look at some patterns but there where all c++. Many thanks for any suggestions,

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• Get spiral index from location

  - by ricick

  I'm using Alberto Santini's solution to this question to get a spiral grid reference based on an items index Algorithm for iterating over an outward spiral on a discrete 2D grid from the origin It's not the accepted solution, but it's the best for my needs as it avoids using a loop. It's working well, but what I want now is to do the inverse. Based on a known x and y coordinate return the index of a location. This is as a precursor to returning the items surrounding a given location.

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• How to load an external view in a NIB?

  - by Sheehan Alam

  I have a ViewController that has its own NIB. I would like to embed that NIB inside of another master NIB. How can I accomplish this in Interface Builder and how do I reference it in code?

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