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• Operating system scheduler question

  - by ual

  I recently asked myself: If a program, like Mozilla Firefox for example, is started - the control must be somehow given to it. But when the program crashes, why doesn't my whole system crash like in early Windows version? How can Windows take back the control from the program, or even not give it to it fully? (Note: This is not my homework; I go to school but in my informatics class are really only guys that would answer with "Can I eat that?" when I ask them about kernels. Same with my teacher.)

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• Export Multiple Sheets to Excel Through Browser

  - by ProfK

  I need to export multiple data tables to Excel on the clients machine, each to their own sheet. If it was just one sheet, I'd use the Excel/csv content type, but I've heard something about an XML format that can represent an entire workbook. I don't want to go down the Packaging and .xlsx route, so I need standard .xls. Our bug tracker, Gemini, used to have an export function that produced an XML file that Excel automatically opened as a multi-sheet workbook, but I can't find it. Is there still such a mechanism, and where can I find that schema?

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• Where can I find boost::fusion articles, examples, guides, tutorials?

  - by Kyle

  I am going to go ahead and shamelessly duplicate this question because the accepted answer is essentially "nope, no guides" and it's been nearly a year now since it's been asked. Does anyone know of any useful articles, guides, tutorials, etc. for boost::fusion besides the barebones documentation on boost.org? (which I'm sure is great as a reference after one has learned the library.) I'm completely open to, say, a link to a book on Amazon. Searched for it myself just now but all I came up with was green tea. The top links on Google aren't much better.

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• Read random lines from huge CSV file in Python

  - by jbssm

  I have this quite big CSV file (15 Gb) and I need to read about 1 million random lines from it. As far as I can see - and implement - the CSV utility in Python only allows to iterate sequentially in the file. It's very memory consuming to read the all file into memory to use some random choosing and it's very time consuming to go trough all the file and discard some values and choose others, so, is there anyway to choose some random line from the CSV file and read only that line? I tried without success: import csv with open('linear_e_LAN2A_F_0_435keV.csv') as file: reader = csv.reader(file) print reader[someRandomInteger] A sample of the CSV file: 331.093,329.735 251.188,249.994 374.468,373.782 295.643,295.159 83.9058,0 380.709,116.221 352.238,351.891 183.809,182.615 257.277,201.302 61.4598,40.7106

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• Finding many local max in an image (using MatLab)

  - by wenh42

  How do you go about figuring our multiple max in a 2D image where the max aren't necessarily all the same height? I have found that the imregionalmax(), imextendedmax(), and findpeaks() functions aren't necessarily that helpful because they give many local max that are really just maxes within the background noise. I tried bw=arrayimdilate(array,[1 1 1; 1 0 1; 1 1 1]) but that also is kind of limited for the same reasons (same thing with expanding the matrix that it uses). I'd definitely appreciate some help..

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• Ruby: would using Fibers increase my DB insert throughput?

  - by Zombies

  Currently I am using Ruby 1.9.1 and the 'ruby-mysql' gem, which unlike the 'mysql' gem is written in ruby only. This is pretty slow actually, as it seems to insert at a rate of almost 1 per second (SLOOOOOWWWWWW). And I have a lot of inserts to make too, its pretty much what this script does ultamitely. I am using just 1 connection (since I am using just one thread). I am hoping to speed things up by creating a fiber that will create a new DB connection insert 1-3 records close the DB connection I would imagine launching 20-50 of these would greatly increase DB throughput. Am I correct to go along this route? I feel that this is the best option, as opposed to refactoring all of my DB code :(

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• In DOM is it OK to use .notation for getting/setting attributes?

  - by Ziggy

  Hi In DOM, is it OK to refer to an element's attributes like this: var universe = document.getElementById('universe'); universe.origin = 'big_bang'; universe.creator = null; universe.style.deterministic = true; ? My deep respect for objects and their privacy, and my sense that things might go terribly wrong if I am not careful, makes me want to do everything more like this: var universe = document.getElementById('universe'); if(universe.hasAttribute('origin')) then universe.origin = 'big_bang'; etc... Is it really necessary to use those accessor methods? Of course it may be more or less necessary depending on how certain I am that the elements I am manipulating will have the attributes I expect them to, but in general do the DOM guys consider it OK to use .notation rather than getters and setters? Thanks!

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• How to prevent UI from freezing during lengthy process?

  - by OverTheRainbow

  Hello, I need to write a VB.Net 2008 applet to go through all the fixed-drives looking for some files. If I put the code in ButtonClick(), the UI freezes until the code is done: Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click 'TODO Find way to avoid freezing UI while scanning fixed drives Dim drive As DriveInfo Dim filelist As Collections.ObjectModel.ReadOnlyCollection(Of String) Dim filepath As String For Each drive In DriveInfo.GetDrives() If drive.DriveType = DriveType.Fixed Then filelist = My.Computer.FileSystem.GetFiles(drive.ToString, FileIO.SearchOption.SearchAllSubDirectories, "MyFiles.*") For Each filepath In filelist 'Do stuff Next filepath End If Next drive End Sub Google returned information on a BackGroundWorker control: Is this the right/way to solve this issue? If not, what solution would you recommend, possibly with a really simple example? FWIW, I read that Application.DoEvents() is a left-over from VBClassic and should be avoided. Thank you.

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• What is this for an IP in my google app engine log file?

  - by Christian Harms

  I get many normal log lines in my google app engine application. But today I go these instead the 4-part number: 2a01:e35:2f20:f770:6c54:3ee8:67fb:df8 What is this for an format? ipv6 are 6 numbers, mac address too... Normal logfile line: 187.14.44.208 - - [19/Mar/2010:14:31:35 -0700] "GET /geo_data.js HTTP/1.1" 200 776 "http://www.xxx.com.br/spl19/index.php?refid=gv_av_ri" "Mozilla/5.0 (Windows; U; Windows NT 5.1; pt-BR; rv:1.9.2) Gecko/20100115 Firefox/3.6 (.NET CLR 3.5.30729),gzip(gfe)" This special logfile line: 2a01:e35:2f20:f770:6c54:3ee8:67fb:df8 - - [18/Mar/2010:17:00:37 -0700] "GET /geo_data.js HTTP/1.1" 500 450 "http://www.xxx.com.br/spl19/index.php?refid=cm_av_ri" "Mozilla/5.0 (Windows; U; Windows NT 6.1; pt-PT; rv:1.9.2) Gecko/20100115 Firefox/3.6,gzip(gfe)"

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• Three20 Library Cannot find its own headers Xcode iPhone

  - by DieLaughing

  import "Three20/Three20.h" Fails. Go download it and build a sample app. If that works, then make a new app from the templates provided, then watch as it fails spectacularly to find the right HEADER_SEARCH_PATH. 1) I've gone to the info page for the TARGET and not the PROJECT (Well, I tried both) and tried a bunch of different paths for the HEADER_SEARCH_PATH field. 2) I've tried dragging and dropping the dependent files from the finder and COPYING or just referencing both fails. (RANT: WTF?! Really? I wish public code libraries saved me time ONCE in my life.)

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• How to reference an object in a lower fragment in android

  - by Silas Greenback

  I am trying to build a help screen that is going to go on a mediaplayer. The idea is to put a fragment with a transparent theme on top of the current view. (See How do I create a help overlay like you see in a few Android apps and ICS? for the basic idea). Now, I understand the steps in the mentioned link, but how do I connect the circles and arrows and paragraphs next to each one (explaining what each one was) to the lower object? Example, I have an object: R.id.music_button and I want there to be and arrow that points to music button. Trying to support as many devices as we do it will be very difficult to just draw a few pictures as part of the top layout and expect them to line up. Again, how do I reference an object on a fragment below the top level? Thanks

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• Style Data in a gridview which dynamically generates the columns

  - by Coesy

  I have built a dynamic gridview using the following code grdVariants.Columns.Clear(); int i = 0; foreach (DataColumn column in options.Columns) { grdVariants.Columns.Add(new GridViewColumn { Header = column.ColumnName, DisplayMemberBinding = new Binding(string.Format("[{0}]", i++)) }); } This will dynamically generate my columns at runtime, I then bind the data using lstVariantsGrid.DataContext = options; lstVariantsGrid.Items.Refresh(); This all works great and shows the data in the correct columns etc, the only issue i have is that I can't style the rows like I would in xaml as it is all an unknown quantity until runtime. Can anyone offer some advice on how I might go about doing this? One of the biggest problems I have is that one of the columns needs to display the image rather than just the path which it currently shows, as well as fiddling with fonts and colors etc. Thanks for your time.

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• After MS Access Conversion 97 --> 2002 I get 'Enter Parameter Value' when exitting a form.

  - by user270370

  Hi, So when I exit a form from my newly converted .mdb it asks to Enter Parameter Value. It goes through (ie if i enter a value, it asks for another) the values required for a query that is run on a List Box on the page. The query has not been changed during the conversion. The values it is getting for the query are from text boxes on the same form. There are a few Requeries in the form (run from VB) so I imagine that it is rerunning again on Exit (although this isnt explicit in the form properties). I'm not quite sure how to go about solving this. Your help would be great. Thanks

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• Dequeue from messageQueue in the PeekCompleted Method

  - by Fraga

  i'm reading messages from MessageQueue using PeekCompleted, i do my process here and if everything go right, I need to remove it from the Queue! currenty i am using MyMessageQueue.Receive() and it works, but is this a reliable way of making sure each message will be processed right? MessageQueue MyMessageQueue; public Form1() { InitializeComponent(); MyMessageQueue = new MessageQueue(@".\private$\Dms"); MyMessageQueue.PeekCompleted += new PeekCompletedEventHandler(MessageQueue_PeekCompleted); MyMessageQueue.Formatter = new XmlMessageFormatter(new Type[] { typeof(string) }); MyMessageQueue.BeginPeek(); } void MessageQueue_PeekCompleted(object sender, PeekCompletedEventArgs e) { try { Debug.WriteLine("ToProcess:" + e.Message.Body); //Long process that maybe fail MyMessageQueue.Receive(); } finally { MyMessageQueue.BeginPeek(); } }

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• NP-complete problem in Prolog

  - by Ashley

  I saw this ECLiPSe solution to the problem mentioned in this XKCD comic. I tried to convert this to pure Prolog. go:- Total = 1505, Prices = [215, 275, 335, 355, 420, 580], length(Prices, N), length(Amounts, N), totalCost(Prices, Amounts, 0, Total), writeln(Total). totalCost([], [], TotalSoFar, TotalSoFar). totalCost([P|Prices], [A|Amounts], TotalSoFar, EndTotal):- between(0, 10, A), Cost is P*A, TotalSoFar1 is TotalSoFar + Cost, totalCost(Prices, Amounts, TotalSoFar1, EndTotal). I don't think that this is the best / most declarative solution that one can come up with. Does anyone have any suggestions for improvement? Thanks in advance!

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• jQuery .getJSON() Not Parsing All Objects

  - by Brad

  I'm using jQuery's .getJSON function to parse a set of search results from a Google Search Appliance. The search appliance has an xslt stylesheet that returns the results as JSON data, which I validated with both JSONLint and Curious Concept's JSON Formatter. According to FireBug, the full result set is returned from the XMLHTTPRequest, but I tried dumping the data (with jquery.dump.js) and it only ever parses back the first result. It does successfully get all the Google Search Protocol stuff, but it only ever sees one "R" object (or individual result). Has anybody had a similar problem with jQuery's .getJSON? I know it likes to fail silently if the JSON is not valid, but like I said, I validated the results with several validators and it should be good to go. Edit: Clicking this link will show you the JSON results returned for a search for the word "google": http://bigbird.uww.edu/search?client=json_frontend&proxystylesheet=json_frontend&proxyrefresh=1&output=xml_no_dtd&q=google jQuery only retrieves the first "R" object, even though all "R" objects are siblings.

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• Preprocessor Conditionals

  - by Mike

  I was wondering if it would be possible to have a define which changes values at some point in the code be used in a conditional. Basically something like this: //////////////////////////////////////////// SomeFile.cpp #define SHUTDOWN false while(window->isOpen()) { if(SHUTDOWN) window->close(); // Rest of the main loop } //////////////////////////////////////////// SomeOtherFile.cpp if(Escape.isPressed()) { #undef SHUTDOWN #define SHUTDOWN true } Thus causing the app to close. If it's not, would having a function like RenderWindow* getWindow() { return window; } and then calling if(Escape.isPressed()) getWindow()->close(); The best way to do it? I'd rather not go that route because the classes that are calling the key event are members of the class controlling the main loop and the window, so I'd have to set pointers to the containing class in the smaller classes to call getWindow() and it just seems like a more complicated method. But if I can't do it with preprocessor directives I'll just have to use pointers to the parent class.

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• iPhone UI: No edit button for UITableView, bad idea?

  - by Nic Hubbard

  I have a UITableViewController which lets the user drill down into different records. On the second level/view, the user can add and edit new records. But, I am not sure what to do, since the back button is on the top left, and I need to put the "Add" button on the top right, so there is no room (keeping to HIG) for the edit button, which would normally go where the back button is. (I am using a tab bar, so can't put it at the bottom.) Do you think that it is logical, to expect users to know to swipe to delete a record? Or, do I need to have an edit button? If I DO need an edit button, where should I put it if I am following HIG?

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• Is there a quick way to build & install to iPhone (from XCode) without starting the app?

  - by Olie

  In XCode, I can use CMD-R to run (or CMD-Y to debug), and my app will compile, install on the phone & start-up. (I've already prepped my phone & XCode so this part works as expected.) What I'd LIKE to do is type CMD-<something else> and have my program compile & install on the phone, but NOT start-up. I realize that I can just CMD-B to build, then go through some rigamarole to deploy, but I'm hoping one of you smart-folk can tell me the lazy-man's shortcut for all of this. Thanks!

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• Adjusting for compass wrap around in a navigation application

  - by chris12892

  I have a application where I am guiding a vehicle on compass headings and I am having an issue when the vehicle is crossing from 360 degrees to 0 degrees. In this case, there are no smarts in the control loop to compute that the nearest way to turn to follow a heading. For example, if the vehicle is instructed to follow a heading of 360 degrees, it will inevitably drifts a few degrees to ether side. If it drifts over to 0+ degrees, the control loop will go nuts and try to steer the vehicle all the way around to get it to 360 degrees again. Is there a graceful way to deal with this? The way the navigate function is written, I use an external PID controller class and I calculate the heading like this: lock (steering) { if (!Engaged) { return; } double mv = 90 + Trim + pidController.CalculateCorrection(flyHeading, currentHeading); steering.Degree = mv; } Thanks!

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• Is there a way to add an MP3 player to my website so that iPhone & iPad users can use it.

  - by codingguy3000

  I have a website www.askvioletnow.com. I added a flash mp3 player that plays a sound clip when you go to the page. I know Flash doesn't work on the iPhone OS, but is there a way to get this type of mp3 player to work on an iPhone? I'm thinking maybe a javascript mp3 player. What I would ultimately want is to replace my flash mp3 player with a different mp3 player and have it so the player is available on Windows and Mac computers as well as iPhone devices. Thanks in advance.

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• gnat programming studio auto fix issues

  - by Richard

  hi, I'm using GNAT Programming Studio to update some ada files. I have a style check, which for these old files produces literally thousands of warnings. Helpfully GPS has a little auto fix 'wrench' icon in the locations view, that's great but I don't want to go through and click the wrench ten thousand times. Is there a way to have it correct these errors automatically without me having to click each wrench? They are all right so I want to be changed automatically. I saw some documentation saying you could do it: http://www.adacore.com/wp-content/files/auto_update/gps-docs/Code-Fixing.html But I don't get the auto fix option when I right click. Maybe you need the pro version? I've tried everything I can think of. This would save hours of work, so it's really appreciated if someone could help on this. Thanks!

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• is there a specialized educational institution in enterprise software design ?

  - by dfafa

  Is a software engineering degree sufficient for being able to design efficient code in enterprise architecture ? I mean that's what I want to do, some people go to game schools (Vancouver Film School) to make games or work in that industry. are there such similar programs for enterprise software design/development ? Are there special courses in Java EE space and .NET ? is it suitable to just focus on java or both ? My ultimate goal would be consulting and developing enterprise software independently....but right now, I am starting school and just keep learning on the side. any guidance to resources on this industry would be appreciated or your insights. Thank you.

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• Getting the errors for code in unopened .aspx pages

  - by Glennular

  Is there a way to check for errors in unopened *.ASPX pages. For example, if you change the name of a function Visual Studio will catch the error on the page and list it in the "Error List" only if the page is opened and being validated? I guess the question could be is there a validation option opposed to the compile option to check for errors? (Yes, i know code should go into the pre-compiled code-behind pages.) How do i find out about the following without running the page through the webserver or opening the page to be validated in VS? <script runat="server"> Public Sub MyFunciton() Undefined_FUNCTION() End Sub </script>

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• Read Call History from iPhone on iOS 5 and above

  - by Sandeep Dhama

  I am developing an application and need to read the users call history from iPhone.I have go though all the forums and google it and found that we can get the records from teh callHistory sqlite database by "private/var/root/Library/CallHistory/call_history.db". But this path is not working from iOS 5 and above. Seems like apple has changed all their database path and structure so that no one can accees it. I have also seen some of the application on iTunes who are capable of getting the users call history like:-https://itunes.apple.com/us/app/callog/id327883585?mt=8 I have also check a mac desktop utility called "WonderShare Dr.Fone" which will fetch all the data from your iPhone like call history messages, notes , etc.How this utility is fetching the call history records and other details? If their is any API or private APIs by which i can get the callHistory data path please let me know.

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