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  • Start diving into large open source projetcs

    - by Vanangamudi
    How to start learning and reading the source of large and complex projects like Blender3D and Gimp, for instance. Since the developers busy improving it and there is no docs exist at present, how do we start developing and customizing these projects. Linux kernel deserve to have several books on its code, also these kind of project do deserve the same. And there are no unit tests available for this kind of projects. Say I'm going to read and understand the source code blender. How do I start. How to setup the development environment for developing the app? If it includes several dependencies, and assume that their source code also available how to setup this kind of inter-related, coherent source code to debug?

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  • Android & Web: What is the equivalent style for the web?

    - by Legend
    I am quite impressed by the workflow I follow when developing Android applications: Define a layout in an xml file and then write all the code in a code-behind style. Is there an equivalent style for the web? I mean, with a predefined list of widgets that can be defined using a markup language and then control them using code? I have come across Google's Web Toolkit that does something like this but I'd like to hear what other's think as well.

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  • sql query returns incorrect result

    - by reza saberi
    I have a mysql database that stores quotation documents with some products that are clearly defining the price of each product in them, and a table for contracts storing contract details as well as customer code and quotation code to which it belongs. I have the following query to see how much is the total price of the quotation to write it in the invoice: select sum(sqproducts.price * sqproducts.quantity) as 'total-price', squotations.currency as 'currency' from sqproducts, ccontracts, squotations where sqproducts.contracted=1 AND squotations.code=sqproducts.quotation_code AND sqproducts.quotation_code=ccontracts.squotation_code AND sqproducts.quotation_code='QUOT/2012/1' group by currency

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  • Is there a command line C++ to PDF converter with syntax highlighting?

    - by NoMoreZealots
    I need to supply "Source code documents w/ Line numbers" which is essentially just a PDF of the source code with syntax highlighting and Line numbers. Is there any existing command line tools for windows that I could call from a script as a "build release version" script? Right now I'm doing it manually using VC++, which isn't even the dev enviroment the code is for a TI processor, and a PDF printer driver, which has a pop up for each file I print.

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  • align an object

    - by Gaurav
    I wanted to align a newsticker about 300px above it's current position , but I am unable to do so. Please help. The page is uploaded for viewing at http://cerebration.0fees.net/test/bottom.html scroll down the page to find the newsticker. The css file contains the css code for the newsticker and the newsticker is of white color(color mentioned for identification). The html page code is at : http://pastebin.com/dP8dSEDS and the css code is as at : http://pastebin.com/46YvqwT7 Thanks in advance.

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  • .trim() in javascript not working in IE

    - by Jin Yong
    I tired to apply .trim() in javascript for one of my code. it's working fine under mozilla, but error display once I tried in IE8, does anyone know what is going on here? anyway I can make it work in IE? code: var ID = document.getElementByID('rep_id').value.trim(); error display: Message: Object doesn't support this property or method Line: 604 Char: 2 Code: 0 URI: http://test.localhost/test.js

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  • What Should be the Structure of a C++ Project?

    - by Ell
    I have recently started learning C++ and coming from a Ruby environment I have found it very hard to structure a project in a way that it still compiles correctly, I have been using Code::Blocks which is brilliant but a downside is that when I add a new header file or c++ source file, it will generate some code and even though it is only a mere 3 or 4 lines, I do not know what these lines do. First of all I would like to ask this question: What do these lines do? #ifndef TEXTGAME_H_INCLUDED #define TEXTGAME_H_INCLUDED #endif // TEXTGAME_H_INCLUDED My second question is, do I need to #include both the .h file and the .cpp file, and in which order. My third question is where can I find the GNU GCC Compiler that, I beleive, was packaged with Code::Blocks and how do I use it without Code::Blocks? I would rather develop in a notepad++ sort of way because that is what I'm used to in Ruby but since C++ is compiled, you may think differently (please give advice and views on that as well) Thanks in advance, ell.

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  • Problem in calling a function from different class using protocols-iphone

    - by Muniraj
    I use cocos2d for my game. In which I play a movie and have a separate overlay view for controls.The touches are detected in the overlay view. Now when the touches are detected the function in the game code has to be invoked. But the function is not detected and there is no error. I dont know what has gone wrong. Someone please help me. The code are as follows The protocol part is @protocol Protocol @required -(void) transition1:(id) sender; @end The function which is to be invoked in the game code is (void) transition1:(id) sender { [[Director sharedDirector] replaceScene: [ [Scene node] addChild: [Layer4 node] z:0] ]; } The code in the overlay view in MovieOverlayViewController.h import "Protocol.h" @interface MovieOverlayViewController : UIViewController { UIImageView *overlay; NSObject <Protocol> *transfer; } @end The code in the overlay view in MovieOverlayViewController.m @implementation MovieOverlayViewController (id)init { if ((self = [super init])) self.view = [[[UIView alloc] initWithFrame:[[UIScreen mainScreen] applicationFrame]] autorelease]; return self; } -(void) viewWillAppear:(BOOL)animated { overlay = [[[UIImageView alloc] initWithImage:[UIImage imageNamed:@"overlay.png"]] autorelease]; [self.view addSubview:overlay]; } (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event { UITouch *touch = [touches anyObject]; CGPoint point = [touch locationInView:self.view]; NSLog(@"pointx: %f pointy:%f", point.x, point.y); if (CGRectContainsPoint(CGRectMake(1, 440, 106, 40), point)) { // the function is called here [transfer transition1: nil]; } else if (CGRectContainsPoint(CGRectMake(107, 440, 106, 40), point)) NSLog(@"tab 2 touched"); } (void)dealloc { [overlay release]; [super dealloc]; } @end

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  • Why can't I create an abstract constructor on an abstract C# class?

    - by Anthony D
    I am creating an abstract class. I want each of my derived classes to be forced to implement a specific signature of constructor. As such, I did what I would have done has I wanted to force them to implement a method, I made an abstract one. public abstract class A { abstract A(int a, int b); } However I get a message saying the abstract modifier is invalid on this item. My goal was to force some code like this. public class B : A { public B(int a, int b) : base(a, b) { //Some other awesome code. } } This is all C# .NET code. Can anyone help me out? Update 1 I wanted to add some things. What I ended up with was this. private A() { } protected A(int a, int b) { //Code } That does what some folks are saying, default is private, and the class needs to implement a constructor. However that doesn't FORCE a constructor with the signature A(int a, int b). public abstract class A { protected abstract A(int a, int b) { } } Update 2 I should be clear, to work around this I made my default constructor private, and my other constructor protected. I am not really looking for a way to make my code work. I took care of that. I am looking to understand why C# does not let you do this.

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  • Sorting 1 million 8-digit numbers in 1MB of RAM

    - by Favourite Chigozie Onwuemene
    I have a computer with 1M of RAM and no other local storage. I must use it to accept 1 million 8-digit decimal numbers over a TCP connection, sort them, and then send the sorted list out over another TCP connection. The list of numbers may contain duplicates, which I must not discard. The code will be placed in ROM, so I need not subtract the size of my code from the 1M. I already have code to drive the ethernet port and handle TCP/IP connections, and it requires 2k for its state data, including a 1k buffer via which the code will read and write data. Is there a solution to this problem?

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  • MessageBox.Show not raising HelpRequested event

    - by Trevortni
    I have a form that is showing a MessageBox using MessageBox.Show, and trying to receive events from the Help button on the MessageBox so I can execute my own code. The Microsoft documentation shows how to do this; however, using what is suggested does not work. Here's a shortened version of my code: Private Function MethodName() As Boolean AddHandler Me.HelpRequested, AddressOf Me.MsgBoxHelpRequested Select Case MessageBox.Show("Text", "Title", MessageButtons.YesNoCancel, MessageBoxIcon.Question, MessageBoxDefaultButton.Button2, 0, True) Case MsgBoxResult.Yes ' Do stuff Case MsgBoxResult.No ' Do stuff Case MsgBoxResult.Cancel RemoveHandler Me.HelpRequested, AddressOf Me.MsgBoxHelpRequested Return False End Select RemoveHandler Me.HelpRequested, AddressOf Me.MsgBoxHelpRequested End Function Private Sub MsgBoxHelpRequested(ByVal sender As Object, ByVal hlpevent As System.Windows.Forms.HelpEventArgs) ' Breakpoint that never gets hit ' More code End Sub I've been searching for a solution to this problem, but the best I've found is this question: http://stackoverflow.com/questions/2407880/how-to-detect-help-button-press-in-windows-forms-messagebox that refers me back to the same Microsoft code that doesn't seem to be working. Can anybody help me with this? Thank you.

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  • Fibonacci Numbers in Haskell

    - by boraer
    Hi everbody I need to change my F# code to Haskell code but I am so new in Haskell and I can not this My code simply read data from keyboard if data not an integer return an error message then calculate the n fibonacci number then writes to a list after that writes the list into a txt file Here is my code open System let rec fib n = match n with |0->0 |1->1 |2->1 |n->fib(n-1)+fib(n-2);; let printFibonacci list = for i=0 to (List.length list)-1 do printf "%d " (list.Item(i));; let writeToFile list = let file = System.IO.File.Create("C:\out2.txt") let mutable s ="" let writer = new System.IO.StreamWriter(file) try for i=0 to (List.length list)-1 do s <- list.Item(i).ToString() writer.Write(s+" ") finally writer.Close() file.Dispose() printfn "Writed To File" let mutable control = true let mutable num = 0 while control do try printfn "Enter a Number:" num <- Convert.ToInt32(stdin.ReadLine()) let listFibonacci = [for i in 0 .. num-1->fib(i)] printFibonacci(listFibonacci) printfn "\n%A"(listFibonacci) writeToFile(listFibonacci) control<-false with | :? System.FormatException->printfn "Number Format Exception"; Console.ReadKey true|>ignore

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  • Saving user settings in Metro app using C#

    - by jitendra garg
    I want to write user selected settings in Metro app, in Local Folder. I have done the code as below, but it is not working. The code to save settings: void OnUnloaded(object sender, RoutedEventArgs args) { //code to save app settings. var localSettings = ApplicationData.Current.LocalSettings; localSettings.Values["playerPosition"] = playerPosition; localSettings.Values["aiPosition"] = aiPosition; localSettings.Values["selectedLevel"] = selectedLevel; } The code to read settings: var localSettings = ApplicationData.Current.LocalSettings; if ((localSettings.Values["playerPosition"]) == null) { localSettings.Values["playerPosition"] = 1; localSettings.Values["aiPosition"] = 1; localSettings.Values["selectedLevel"] = "1"; playerPosition = aiPosition = 1; selectedLevel = "1"; } else { playerPosition = (int)localSettings.Values["playerPosition"]; aiPosition = (int)localSettings.Values["aiPosition"]; selectedLevel = (string)localSettings.Values["selectedLevel"]; ---- Clearly I am supposed to save this localSettings variable in a file. But, I am unable to find the code to do that. Also, is Unload event a good place to do it, or should I move it to OnNavigatedFrom event?

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  • How to evaluate text strings provided by sed/grep/whatever?

    - by T.J.
    This is for UNIX shell programming. It have to be supported by multiple UNIX platforms including Solaris, Linux, and AIX. I have this scenario -- I am to read from a text file a string that may or may not contain an environment variable that may or may not be defined. For example: <foo.bar> This error code was found: $(error_code) I have the following code: statement=$(sed -n $1'p' $messagefile) echo $echo_flag $statement $1 = line number supplied to this particular function/script. $messagefile = filename of log file. $echo_flag = "-e" in Linux, otherwise, empty. $(error_code) = 42. Instead of getting this when running: <foo.bar> This error code was found: 42 I still get this: <foo.bar> This error code was found: $(error_code) How exactly do I tell the shell script that the value of statement should be evaluated further beyond what sed have done?

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  • Problems with instantiating in JAVA

    - by PUPIALEX
    When running, below programme cannot reach the end of the main function.. I am new to JAVA, and cannot find its defections.. I need your help. Thanks. import java.util.*; class Schedule { public String day; private int startTime, endTime; public Schedule(String input_day, int input_start, int input_end) { day = input_day; startTime = input_start; endTime = input_end; } /* clashWith: to check whether this schedule clash with a Schedule called otherSchedule * PRE-Condition : input must be of Schedule type * POST-Condition : return true if two Schedule clash, return false if not. */ public boolean clashWith(Schedule otherSchedule) { if(this.day != otherSchedule.day || this.endTime <= otherSchedule.startTime || this.startTime >= otherSchedule.endTime) return false; return true; } } class Module { String code; Schedule lecture, tutorial, lab; public Module(String input_code, Schedule input_lecture, Schedule input_tutorial, Schedule input_lab) { code = input_code; lecture = input_lecture; tutorial = input_tutorial; lab = input_lab; } /* count: to count number of classes(lecture, tutorial, and lab of only this Module) on day. * For example: when day = "Monday", lecture is on Monday, tutorial is on Monday * but lab is on Tuesday, then return 2. (lecture and tutorial are on Monday). * PRE-Condition : * POST-Condition : */ public int count(String day) { int num = 0; if(lecture.day == day) num++; if(tutorial.day == day) num++; if(lab.day == day) num++; return num; } /* clashWith: to check whether this module clash with a Module called otherModule * PRE-Condition : * POST-Condition : */ public boolean clashWith(Module otherModule) { if(lecture.clashWith(otherModule.lecture) || lecture.clashWith(otherModule.tutorial) || lecture.clashWith(otherModule.lab) ) return true; if(tutorial.clashWith(otherModule.lecture) || tutorial.clashWith(otherModule.tutorial) || tutorial.clashWith(otherModule.lab)) return true; if(lab.clashWith(otherModule.lecture) || lab.clashWith(otherModule.tutorial) || lab.clashWith(otherModule.lab)) return true; return false; } } class Timetable { Vector<Module> listOfModule; public Timetable() { } /* checkClash: to check whether otherModule clash with one of * the modules in our timetable list. * PRE-Condition : * POST-Condition : */ public boolean checkClash(Module otherModule) { for(Module c: listOfModule) if(c.clashWith(otherModule)) return true; return false; } /* add: to add a new module to the timetable list. * PRE-Condition : * POST-Condition : */ public void add(Module module) { listOfModule.add(module); } /* count: to count number of classes on day. * PRE-Condition : * POST-Condition : */ public int count(String day) { int count_day=0; for(Module c: listOfModule) count_day += c.count(day); return count_day; } } public class Main { public static void main(String[] args) { Scanner input = new Scanner(System.in); int num_operation; String code ; Timetable userTimetable = new Timetable(); num_operation = input.nextInt(); for(int i=0;i<num_operation;i++) { if(input.next() == "MODULE") { code = input.next(); String day; int start, end; Schedule getLecSche = new Schedule(input.next(),input.nextInt(),input.nextInt()); Schedule getTutSche = new Schedule(input.next(),input.nextInt(),input.nextInt()); Schedule getLabSche = new Schedule(input.next(),input.nextInt(),input.nextInt()); Module userModule = new Module(code, getLecSche, getTutSche, getLabSche); System.out.println("Reached line 162"); if(!userTimetable.checkClash(userModule)) { userTimetable.add(userModule); System.out.println("Added"); } else System.out.println("Clashed"); } else if(input.next() == "COUNT"){ code = input.next(); System.out.println(userTimetable.count(code)); } } } }

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  • for loop vs while loop

    - by Atul
    We can use for loop and while loop for same purpose. in what means they effect our code if I use for instead of while? same question arises between if-else and switch-case? how to decide what to use? for example which one you would prefer? This code: int main() { int n; cin>>n; for(int i=0;i<n;i++) { do_something(); } return 0; } Or this code: int main() { int n,i=0; cin>>n; while(i<n) { do_something(); i++; } return 0; } if using for or while loop does not effect the code by any means then may I know What was the need to make 2 solution for same problem?

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  • Does writing program using global variables is safer?

    - by ZoZo123
    I was reading about buffer, stack and heap overflows. I read this post as well. my question is like that: if I use only global variables in my code, can I say it prevents all the exploits of overflow? let's say I have this buffers in code declared in the global scope: char buf1[10]; char buf2[100]; If I send buf1 as the buffer to recv(int s, char *buf, int len,int flags); I will overwrite the data segment and may ruin the buf2 content, right? Would I be able to run a code from it because as I know it is not a code segment and data segment is not executable. Can we conclude that using Globals is the safest way?

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  • Convert this SQL Query into LINQ (OVER (PARTITION BY Date))

    - by user1106649
    Here's the query i'm trying to convert into Linq: SELECT R.Code, R.FlightNumber, S.[Date], S.Station, R.Liters, SUM(R.Liters) OVER (PARTITION BY Year([Date]), Month([Date]), Day([Date])) AS Total_Liters FROM S INNER JOIN R ON S.ID = R.SID WHERE (R.Code = 'AC') AND FlightNumber = '124' GROUP BY Station, Code, FlightNumber, [Date], Liter ORDER BY R.FlightNumber, [Date] Thanks for any help.

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  • Permalink Ajax Issue Wordpress

    - by Soumya
    function AjaxRequest(section,divName) { var pageurl = fullPath+"/ajaxrequest.php?section="+section+"&divName="+divName; //alert(pageurl); var xmlhttp; if (window.XMLHttpRequest) {// code for IE7+, Firefox, Chrome, Opera, Safari xmlhttp=new XMLHttpRequest(); } else {// code for IE6, IE5 xmlhttp=new ActiveXObject("Microsoft.XMLHTTP"); } xmlhttp.onreadystatechange=function() { if (xmlhttp.readyState==4 && xmlhttp.status==200) { document.getElementById(divName).innerHTML=''; document.getElementById(divName).innerHTML=xmlhttp.responseText; } } xmlhttp.open("GET",pageurl,true); xmlhttp.send(); } I have a Code like that in wordpress which is calling a page using ajax. It is working fine when the page are coming in ID like ?page_id=37 but stop working when I am activating Permalink like /overview/ajaxpage. I am getting 404 pafe error on xmlhttp.readyState. Can any one help me to solve it. I know its a permalink Problem probably this code of ajax is not sufficient for transmuting Permalink.

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  • Problem with default member functions of class in C++ (constructor, destructor, operator=, copy cons

    - by Narek
    We know that compiler generates some member functions for user-defined class if that member functions are not defined but used, isn't it. So I have this kind of code: class AA { }; void main() { AA a; AA b(a); a = b; } This code works fine. I mean no compiler error. But the following code.... class AA { int member1; int member2; }; But this code gives an run time error, because variable "a" is used without being iniltialized!!! So my question is this: when we instantiate an int, it has a value. So why the default constructer doesn't work and by using those two int numbers initializes variable "a"??

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  • WPF: issue updating UI from background thread

    - by Ted Shaffer
    My code launches a background thread. The background thread makes changes and wants the UI in the main thread to update. The code that launches the thread then waits looks something like: Thread fThread = new Thread(new ThreadStart(PerformSync)); fThread.IsBackground = true; fThread.Start(); fThread.Join(); MessageBox.Show("Synchronization complete"); When the background wants to update the UI, it sets a StatusMessage and calls the code below: static StatusMessage _statusMessage; public delegate void AddStatusDelegate(); private void AddStatus() { AddStatusDelegate methodForUIThread = delegate { _statusMessageList.Add(_statusMessage); }; this.Dispatcher.BeginInvoke(methodForUIThread, System.Windows.Threading.DispatcherPriority.Send); } _statusMessageList is an ObservableCollection that is the source for a ListBox. The AddStatus method is called but the code on the main thread never executes - that is, _statusMessage is not added to _statusMessageList while the thread is executing. However, once it is complete (fThread.Join() returns), all the stacked up calls on the main thread are executed. But, if I display a message box between the calls to fThread.Start() and fThread.Join(), then the status messages are updated properly. What do I need to change so that the code in the main thread executes (UI updates) while waiting for the thread to terminate? Thanks.

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