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• Server Side code Pushing Data to client Browser while current thread is busy Comet (programming)

  - by h_power11

  Hello Friends, I am writing one simple web page with bunch of textboxes and a button control. Now when user finished editing the values on this text boxes user has to click the button and this button invoke heavily process intensive algorithm on server side code based on the data received from client (Textboxes) And it could some time takes up to 30 to 45 minutes to complete the whole operation so the current thread is still inside the button click event handler function. That background task only provides one event, and the web page subscribes to it to get some text data after each stage of processing I was wandering if there is any way I can keep user up-to-date with what is the current progress on that background task. I have div element to print the current status information So I am looking for some sort of reverse mechanism then "get" and "post". I have read some articles on the Comet (programming) but I can't find any easy or definitive answer Thanks in advance

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• C++ operator[] syntax.

  - by Lanissum

  Just a quick syntax question. I'm writing a map class (for school). If I define the following operator overload: template<typename Key, typename Val> class Map {... Val* operator[](Key k); What happens when a user writes: Map<int,int> myMap; map[10] = 3; Doing something like that will only overwrite a temporary copy of the [null] pointer at Key k. Is it even possible to do: map[10] = 3; printf("%i\n", map[10]); with the same operator overload?

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• Calculate time taken by each cpp file to compile in VS2005?

  - by Rajiv Podar

  Hi Guys, I am writing a tool which can be used to make the matrix for the current performance of the project. For that I required to get the time taken by each file to get compiled. I tried with the following option but didn't succeed :( Tools-Options-Proejcts & Solutions - VC++ Project Settings - Build Timing- Yes From the above option I am able to get the whole time taken to build the solution but my problem is to get for each one. I am using VS2005 So anyone is having any idea then pls revert back ASAP....

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• how to use ByteArrayOutputStream and DataOutputStream simultaneously (Java)

  - by Manuel

  Hi! I'm having quite a problem here, and I think it is because I don't understand very much how I should use the API provided by Java. I need to write an int and a byte[] into a byte[] I thought of using a DataOutputStream to solve the data writing with writeInt(int i) and write(byte[] b), and to be able to put that into a byte array, I should use ByteArrayOutputStream's method toByteArray(). I understand that this classes use the Wrapper pattern, so I had two options: DataOutputStream w = new DataOutputStream(new ByteArrayOutputStream()); or ByteArrayOutputStream w = new ByteArrayOutputStream(new DataOutputStream()); but in both cases, I "loose" a method. in the first case, I can't access the toByteArray method, and in the second, I can't access the writeInt method. How should I use this classes together?

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• Keeping Score in XNA Game

  - by Seven

  Hi. I'm following an XNA tutorial and have the following code for collision detecting (detecting when a bullet collides with a target). Basically I'm looking to increment a score variable to display the score to the screen without re-writing the whole program. No matter where I place it in this method it seems to start incrementing from the number of targets, not from zero. Is there something simple I'm missing here? Any help would be greatly appreciated. Thanks. private CollisionType CheckCollision(BoundingSphere sphere) { if (completeCityBox.Contains(sphere) != ContainmentType.Contains) return CollisionType.Boundary; for (int i = 0; i < targetList.Count; i++) { if (targetList[i].Contains(sphere) != ContainmentType.Disjoint) { targetList.RemoveAt(i); i--; AddTargets(); return CollisionType.Target; } } return CollisionType.None; }

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• Auto refresh of page in Rails 3 using javascript

  - by teknull

  I have a view in my rails app: blah.app/units/status This displays a status of all my units. I'd like to have the page automatically refresh via javascript but I'm not sure how to do it. I tried writing this but it doesn't reload: <script> $(function() { setInterval(function(){ $.getScript("/units/status"); }, 10000); }); </script> Can someone point out where I'm going wrong here?

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• Feed char array into stdin

  - by Brian Lindsey

  I am writing a parser for a mini scripting language. Some of my grammar rules require jumping to a different location in the file to obtain information. There doesn't seem to be a straightforward way to accomplish this. So, I was thinking about loading my data files into a char array array and parsing line by line. This will allow me to jump all over the array with ease. My question is, is it possible to feed char arrays (i.e. char *) into stdin, so I can easily invoke the yyparse() function as needed.

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• Perl Email package

  - by aidan

  I'm looking for a simple (OO?) approach to email creation and sending. Something like $e = Email->new(to => "test <[email protected]>", from => "from <[email protected]>"); $e->plain_text($plain_version); $e->html($html_version); $e->attach_file($some_file_object); I've found Email::MIME::CreateHTML, which looks great in almost every way, except that it does not seem to support file attachments. Also, I'm considering writing these emails to a database and having a cronjob send them at a later date. This means that I would need a $e->as_text() sub to return the entire email, including attachments, as raw text which I could stuff into the db. And so I would then need a way of sending the raw emails - what would be a good way of achieving this? Many thanks

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• What happens if you break out of a Lock() statement?

  - by cyclotis04

  I'm writing a program which listens to an incoming TcpClient and handles data when it arrives. The Listen() method is run on a separate thread within the component, so it needs to be threadsafe. If I break out of a do while loop while I'm within a lock() statement, will the lock be released? If not, how do I accomplish this? Thanks! (Any other advice on the subject of Asynchronous TCP Sockets is welcome as well.) private void Listen() { do { lock (_client) { if (!_client.Connected) break; lock (_stateLock) { if (!_listening) break; if (_client.GetStream().DataAvailable) HandleData(); } } Thread.Sleep(0); } while (true); }

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• Did you ever switch from one programming language to another?

  - by Johan Pelgrim

  The stereotypical programmer is very keen on writing software in one particular programming language and is very fanatic about defending their programming language in any way they can, without being realistic about whether their programming language is the best tool for the job. The other kind of programmer can take a step back and switch between languages (or is not very concerned about doing everything in just one language), is a "jack-of-all-trades", and doesn't mind learning a new language as long as it solves their problem in a good fashion. Did you ever switch from one programming language to another? If yes, why? [P.S. Please don't just answer with "I switched from language A to B because company X sucks! I think it will be very useful to understand why people switch between languages, or what's the best tool for a particular kind of job]

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• Impressing Potential Employers

  - by superfly123

  Where I am, I can't afford to get certification. I'm definitely not the best programmer, but I do know my junk. I've been writing software in C++ for over 8 years now and have a very good knowledge of the Win32 API. But when applying for jobs, I get rejected every time I send a resume. I've given my resume to recruitment firms and asked them what they think's wrong with it and they said the only thing they could think of is the fact that I don't have certifications to prove that I know my stuff. But in my resume, I explain my previous work and projects, and also note that upon request they can actually see what I've done. Is there anything that you would suggest that might help others to stop ignoring my resumes? Thank you

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• Looking for a tutorial and/or example for the following: Annotation based Spring 3 with JPA and/or h

  - by Conor

  I want to learn Spring. I'd like to start with Spring 3. I want a simple tutorial and/or example. So no full blown web example please. Also - not a trivial example - so something incorporating persistence (e.g. JPA or hibernate) would be nice. Also - I don't want to get bogged down writing XML. So - Annotation based Spring 3 with JPA and/or hibernate. Yes - there is a good reference for Spring 3.0, but it's XML based. I can't find anything else useful. Thanks in advance.

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• Upon USB insert, record unique identifer sting, format drive to FAT32 and copy a file. Bash or Pytho

  - by samsixty

  Hello, This is what I want to do, insert USB flash drive. mount it. record uniquie identifer string to a file. format the drive to FAT32. copy a text file to the drive. unmount it. remove the drive. 30 times The situation is this, I have bought 30 usb drives. I need to format each one to ensure they are clean, I need the unique string from each device. I need to put the same txt file on each one. I am not great at writing scripts but can read and follow bash and python. Any pointers would be appreciated.

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• How to trigger notification code TBN_TOOLBARCHANGE from inside c++ program?

  - by karikari

  Hi. How to trigger TBN_TOOLBARCHANGE from inside my c++ code? Is it the same as writing like this line below? SendMessage(m_hWndToolbar, TB_SETBUTTONINFO, m_buttonID, (LPARAM)(&inf)); Inside this project's code there is this line inside one the header file: BEGIN_MSG_MAP(CRebarHandler) NOTIFY_CODE_HANDLER(TBN_DROPDOWN, onNotifyDropDown) NOTIFY_CODE_HANDLER(TBN_TOOLBARCHANGE, onNotifyToolbarChange) NOTIFY_CODE_HANDLER(NM_CUSTOMDRAW, onNotifyCustomDraw) NOTIFY_CODE_HANDLER(TBN_ENDADJUST, onNotifyEndAdjust) MESSAGE_HANDLER(WM_SETREDRAW, onSetRedraw) END_MSG_MAP() It has already defined that for each TBN_TOOLBARCHANGE call, it will trigger the function onNotifyToolbarChange. For this example, it is triggered by IE. Inside my code, I need to trigger that particular function. And before that I need to trigger the TBN_TOOLBARCHANGE`. I just want to know how can it be done inside code, for example under a conditional statement.

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• Is there a TextWriter interface to the System.Diagnostics.Debug class?

  - by John Källén

  I'm often frustrated by the System.Diagnostics.Debug.Write/WriteLine methods. I would like to use the Write/WriteLine methods familiar from the TextWriter class, so I often write Debug.WriteLine("# entries {0} for connection {1}", countOfEntries, connection); which causes a compiler error. I end up writing Debug.WriteLine(string.Format("# entries {0} for connection {1}", countOfEntries, connection)); which is really awkward. Does the CLR have a class deriving from TextWriter that "wraps" System.Debug, or should I roll my own?

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• What does the R function `poly` really do?

  - by merlin2011

  I have read through the manual page ?poly (which I admit I did not completely comphrehend) and also read the description of the function in book Introduction to Statistical Learning. My current understanding is that a call to poly(horsepower, 2) should be equivalent to writing horsepower + I(horsepower^2). However, this seems to be contradicted by the output of the following code. library(ISLR) summary(lm(mpg~poly(horsepower,2), data=Auto))$coef summary(lm(mpg~horsepower+I(horsepower^2), data=Auto))$coef Output: Estimate Std. Error t value Pr(>|t|) (Intercept) 23.44592 0.2209163 106.13030 2.752212e-289 poly(horsepower, 2)1 -120.13774 4.3739206 -27.46683 4.169400e-93 poly(horsepower, 2)2 44.08953 4.3739206 10.08009 2.196340e-21 Estimate Std. Error t value Pr(>|t|) (Intercept) 56.900099702 1.8004268063 31.60367 1.740911e-109 horsepower -0.466189630 0.0311246171 -14.97816 2.289429e-40 I(horsepower^2) 0.001230536 0.0001220759 10.08009 2.196340e-21 My question is, why does the output not match, and what is poly really doing?

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• How to define a ternary operator in Scala which preserves leading tokens?

  - by Alex R

  I'm writing a code generator which produces Scala output. I need to emulate a ternary operator in such a way that the tokens leading up to '?' remain intact. e.g. convert the expression c ? p : q to c something. The simple if(c) p else q fails my criteria, as it requires putting if( before c. My first attempt (still using c/p/q as above) is c match { case(true) = p; case _ = q } another option I found was: class ternary(val g: Boolean = Any) { def |: (b:Boolean) = g(b) } implicit def autoTernary (g: Boolean = Any): ternary = new ternary(g) which allows me to write: c |: { b: Boolean = if(b) p else q } I like the overall look of the second option, but is there a way to make it less verbose? Thanks

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• Getting MATLAB variable (string) from C

  - by Hamming

  Hi! I'm writing a small C application that launchs a Matlab script (.m file). I need to exchange some variables and I don't know how to get an array of chars that exists in Matlab. I'm doing something like this: enter code here result = engGetVariable(ep,"X"); if (!result) { printf ("Error..."); exit -1; } int n = mxGetN(result); char *varx = NULL; memcpy(varx, mxGetData(result),n*sizeof(char)); It doesn't work. Does someone know how to get a Matlab string in C? I've read Matlab documentation about engGetVariable() and the provided example but any of this things clarify me.

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• How do you use the C language to produce a ruby gem?

  - by DJTripleThreat

  I would like to see some source code or maybe a link to some that gives at least a stub for writing ruby gems in the C languages (C++?? is that possible too?) Also, some of you may know that Facebook compiles some of their code natively as php extensions for better performance. Is anyone doing this in Rails? If so, what has been your experience with it? Have you found it to be useful? Thanks. Edit: I guess I'll answer my own question with some stuff I learned today but I'm going to leave the question open for another answer because I'd like to see what others have to say on this topic

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• Split SQL statements

  - by eaZy

  Hello, I am writing a backend application which needs to be able to send multiple SQL commands to a MySQL server. MySQL = 5.x support multiple statements, but unfortunately we are interfacing with MySQL 4.x. I am trying to find a way (hint: regex) to split SQL statements by their semicolon, but it should ignore semicolons in single and double quotes strings. http://www.dev-explorer.com/articles/multiple-mysql-queries has a very nice regex to do that, but doesn't support double quotes. I'd be happy to hear your suggestions.

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• ByteArrayOutputStream to PrintWriter (Java Servlet)

  - by Thomas

  Writing generated PDF (ByteArrayOutputStream) in a Servlet to PrintWriter. I am desperately looking for a way to write a generated PDF file to the response PrintWriter. Since a Filter up the hierarchy chain has already called response.getWriter() I can't get response.getOutputStream(). I do have a ByteArrayOutputStream where I generated the PDF into. Now all I need is a way to output the content of this ByteArrayOutputStream to the PrintWriter. If anyone could give me a helping hand would be very much appreciated!

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• What Is The Best Scripting Language To Learn?

  - by Strider

  I have been learning C and C++ for sometime now. But, they do not allow me to do a lot of things like writing a script/program to get a bunch of files from the internet easily. So, I want to learn a scripting language which is fun and which is useful for everyday chores. Which one would you recommend, and why? Other information that might be useful: References to tutorials / helpful information on how to learn the language. References to implementations of the language. Niches where you have found it to be particularly useful.

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• Cannot attach to a service in VS 2008

  - by rhj4

  I have created a service in VS 2008 called EmailReader. I have compiled, installed and started the service. Its timer loop is writing records to a log file, so I can see that it is running. I am trying to attach to it in VS 2008, but the process name is greyed out in the list of available processes, and the name is "EmailReader.vshost.exe" instead of "EmailReader.exe". There is probably a simple answer, but I don't know it. Do you?

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• Reference to fnc.

  - by atch

  Hi guys, Is there a way in java to do something like this: void fnc(void Reference_to_other_func()); What I'm trying is basically I have number of places where I need to display this same text to the user and the only difference is which method is invoked after this text. So for example instead of writing: System.out.println("Hello"); f1(); //in some other place System.out.println("Hello"); f2(); //etc I would like to define one function: public void f(void Reference_to_other_func()) { System.out.println("Hello"); Reference_to_other_func();//HERE I'M INVOKING } and then instead of repeating this whole code I could write something like this: f(f1); //in some other place f(f2) //etc. Thanks for answers

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• Is it a good idea to include a large text variable in compiled code?

  - by gladman

  I am writing a program that produces a formatted file for the user, but it's not only producing the formatted file, it does more. I want to distribute a single binary to the end user and when the user runs the program, it will generate the xml file for the user with appropriate data. In order to achieve this, I want to give the file contents to a char array variable that is compiled in code. When the user runs the program, I will write out the char file to generate an xml file for the user. char* buffers = "a xml format file contents, \ this represent many block text \ from a file,..."; I have two questions. Q1. Do you have any other ideas for how to compile my file contents into binary, i.e, distribute as one binary file. Q2. Is this even a good idea as I described above?

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