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• Is there a default buffer length for 'sprintf' method?

  - by Isuru

  Hi, I used sprintf method to format data to a string which I want to write to a file, in C++ console application using VS 2008. The Input is a particular message, which has various variables and values (ex: Type 'int' and Value '10' / Type string and value "abc", etc.) When I send a two messages it works perfectly. But When I send more than two messages it gives a runtime error saying 0xC0000005: Access violation reading location 0xabababab. Why is this happening? Is it because the method 'sprintf' has a default buffer length? How can I overcome this problem?

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• PHP and writing clean code

  - by Pirkka

  Hello Im trying to find best practices to write PHP. I just wonder is this a bad habit. For example, processing variables. $var = 1 $var = doSomething($var); $var = doSomething2($var); $var = doSomething3($var); It looks a bit awful. Here is a example of a real code that I just did: $this->rSum = explode(",", $this->options["rSum"]); $this->rSum = array_combine(array_values($this->rSum), array_fill(0, count($this->rSum), 0)); If someone could pass me some good tutorials of writing cleaner code generally it would be nice! Its me again asking stupid questions. :)

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• Using fscanf with dynamically allocated buffer.

  - by ryyst

  Hi, I got the following code: char buffer[2047]; int charsRead; do { if(fscanf(file, "%2047[^\n]%n%*c", buffer, &charsRead) == 1) { // Do something } } while (charsRead == 2047); I wanted to convert this code to use dynamically allocated variables so that when calling this code often I won't get heavy memory leakage. Thus, I tried this: char *buffer = malloc(sizeof(char) * 2047); int *charsRead = malloc(sizeof(int)); do { if(fscanf(file, "%2047[^\n]%n%*c", *buffer, charsRead) == 1) { // Do something } } while (*charsRead == 2047); Unfortunately, this does not work. I always get “EXC_BAD_ACCESS” errors, just before the if-statement with the fscanf call. What am I doing wrong? Thanks for any help! -- Ry

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• Execute C++ exe from C# form using Process.start()

  - by Dan

  Hi, I'm trying to create a C# form app that will allow me to use all of my previous C++ programs from one central program. I'm able to open the exes with Process.start, however it does not compile the code correctly. Example code: Process.Start("C:\\Documents and Settings\\dan\\Desktop\\test.exe"); This will bring up the console and act like it's running, but it does not run like when I normally compile out of the C++ editor. Is there a startinfo variable I need to set to signify that it's a c++ program or something along that line? Also, is there any way to execute a C++ program using process.start that will allow me to pass it variables through the command line via argc and argv? Thanks

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• How can I sandbox Python in pure Python?

  - by Blixt

  I'm developing a web game in pure Python, and want some simple scripting available to allow for more dynamic game content. Game content can be added live by privileged users. It would be nice if the scripting language could be Python. However, it can't run with access to the environment the game runs on since a malicious user could wreak havoc which would be bad. Is it possible to run sandboxed Python in pure Python? If not, are there any open source script interpreters written in pure Python that I could use? The requirements are support for variables, basic conditionals and function calls (not definitions).

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• Why image button dont work with forms in IExplorer 7+ ??? (Html)

  - by DomingoSL

  Hello guys, i have a web form who send post variables like: <form action="teacher.php" method="post"> <input name="pass" type="password"> <input name="quiere" type="image" value="submit" src="IMG/unlock-32.png" /> </from> In the same page i check for a submit acction with php doing a simple isset check like: "if (isset($_POST['quiere'])) {" But if you do this in IE the post var "QUIERE" (the button var) does not post, the others vars are fine, and if you try this simple form in any other browser it works. I only get this form function well in IE changing the button for a normal button, instead of a image button like: <input name="quiere" type="submit" value="submit" /> In this way, the var "quiere" get post. So, what do you think? and sorry for my english.

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• How to return variable datatypes from a method

  - by Praesagus

  I have a method whose callers require different datatypes. I could repeat the requisite conversions a dozen times by putting them in each of the callers, but it seems much more efficient to do it once in the called method. public String myMethod(String myArg) { return DoSomething(myArg); } public Int32 myMethod(String myArg) { return Convert.ToInt32(DoSomething(myArg)); } private String DoSomething(key) { return SomeList[key]; } If I have multiple methods that pull data from SomeList and have to utilize different data types then in each I have to do a type conversion. Examples might be session variables or query or form requests or any other number of things. In VB I could say Function myMethod(myArg as String) as Variant myMethod=DoSomething(myArg) End Function Sorry if the original post was not very clear. I hope this makes more sense. Thanks

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• Problems with installing jcc and pylucene

  - by Christian

  I'm trying to install pylucene on Windows XP. I installed JDK on C:\Programme\Java\jdk1.6.0_18 . I also installed Visual Studio C++ Express to have a C++ compiler. As first step I'm trying to integrate jcc into python2.6 through the command: C:\Python26\python.exe setup.py build This gives me the following result: C:\Installfiles\pylucene-3.0.1-1\jcc>C:\Python26\python.exe setup.py build Traceback (most recent call last): File "setup.py", line 332, in <module> main('--debug' in sys.argv) File "setup.py", line 289, in main raise type(e), "%s: %s" %(e, args) WindowsError: [Error 2] Das System kann die angegebene Datei nicht finden: ['jav ac.exe', '-d', 'jcc/classes', 'java/org/apache/jcc/PythonVM.java', 'java/org/apa che/jcc/PythonException.java'] Other information: In systems I set: Uservariables: CLASSPATH C:\Programme\Java\jdk1.6.0_18\bin\javac.exe System Variables Path %SystemRoot%\system32;%SystemRoot%;%SystemRoot%\System32\Wbem; C:\Programme\Java\jdk1.6.0_18\bin Where does the error come from and what do I have to do to overcome it?

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• maths in Javascript.

  - by Jared

  Can someone please help me out with a javascript/jquery solution for this arithmetic problem... I need to subtract one number from the other. The problem is that the numbers have dollar signs (because its money). So it seems that jquery is treating them as strings instead of numbers. I have created two variables - toalAssets and totalLiabilites. I would like to subtract the latter from the former and place the result into another variable called netWorth Perhaps i need to use 'parseFloat'? But I'm not sure how - his is all a little over my head!

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• Concurrency Problem in Java ...

  - by Tara Singh

  I am designing a client-server chat application in Java. This is a secure application where the messages are exchanged using cryptographic algorithms. I have one server and it can support many clients. My problem is that when one client logs on the server it works fine, but when another user logs into the system, the server starts giving me bad padding exceptions for the encrypted text. I am not able to figure out the problem, according to my logic, when new connection request to server is made, the server creates a thread for listening to the client. Is it possible that once the instance of thread class is created, it does all the processing correctly for the first client, but not for the second client because the variables in server listener thread class already have some previous value, and thus the encrypted text is not decrypted properly? Please advise how I can make this process more robust so that the number of clients does not affect how well the server functions.

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• smart reversing of compressed javascript with obscured variable & function names ?

  - by Jerome WAGNER

  Hello, I want to know if there exists a tool to help in reversing a compressed javascript that has obscure variable names. I am not looking for a pretty-printing beautifier, but for a tool that actually know a to change & propagate variable name choices. Let me be more specific : - some of the functions belong to the 'public' API and i want to impose readable argument names in their prototypes - there are intermediary variables for document, window and other browser idioms I would like to give this knowledge to the tool and then let it create another javascript where the knowledge would have been correctly propagated. thanks Jerome Wagner

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• zend_form ViewScript decorator / passing arguments

  - by timpone

  I have a form that is extend from Zend_Form. I am placing the form into a ViewScript decorator like this: $this->setDecorators(array(array('ViewScript', array('viewScript' => 'game/forms/game-management.phtml')))); I'd like to pass in a variable to this ViewScript but am not sure how this could be done. Since the partial renders out as a Zend_View (allowing $this-app_store_icon for rendering), it seems like there should be a way to pass variables to be rendered. I tried the following but to no avail. $this->setDecorators(array(array('ViewScript', array('viewScript' => 'game/forms/game-management.phtml'),array('app_store_picon'=>$current_app_store_picon)))); Any help on how to get this done would be appreciated. thanks

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• Lock Free Queue -- Single Producer, Multiple Consumers

  - by Shirish

  Hello, I am looking for a method to implement lock-free queue data structure that supports single producer, and multiple consumers. I have looked at the classic method by Maged Michael and Michael Scott (1996) but their version uses linked lists. I would like an implementation that makes use of bounded circular buffer. Something that uses atomic variables? On a side note, I am not sure why these classic methods are designed for linked lists that require a lot of dynamic memory management. In a multi-threaded program, all memory management routines are serialized. Aren't we defeating the benefits of lock-free methods by using them in conjunction with dynamic data structures? I am trying to code this in C/C++ using pthread library on a Intel 64-bit architecture. Thank you, Shirish

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• To subclass or not to subclass

  - by poulenc

  I have three objects; Action, Issue and Risk. These all contain a nunber of common variables/attributes (for example: Description, title, Due date, Raised by etc.) and some specific fields (risk has probability). The question is: Should I create 3 separate classes Action, Risk and Issue each containing the repeat fields. Create a parent class "Abstract_Item" containing these fields and operations on them and then have Action, Risk and Issue subclass Abstract_Item. This would adhere to DRY principal.

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• Problem comparing keys in Appengine/Python

  - by ana

  I'm trying to create a relationship between "tables" with Appengine/Python. Imagine I have a "table" for items, and a table for colors. I save the color of an item by saving the color key as an atribute of the item. That's working well, but this particular piece of code is not working: <select id="colorKey" name="colorKey"> {% for color in colors %} <option value="{{ color.key }}"{% if color.key = item.colorKey %} selected="selected"{% endif %}> {{ color.name }} - {{ item.colorKey }} - {{ color.key }} </option> {% endfor %} </select> Since the {{ item.colorKey }} and {{ color.key }} variables are actually the same chain of characters, I only can think in a problem with the types. {{ item.colorKey }} is a string for sure. But maybe {{ color.key }} is not?

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• Newbie questions about COM

  - by smwikipedia

  Hi, I am quite new to COM so the question may seem naive. Q1. About Windows DLL Based on my understanding, a Windows DLL can export functions, types(classes) and global variables. Is this understanding all right? Q2. About COM My naive understanding is that: a COM DLL seems to be just a new logical way to organize the functions and types exported by a standard Windows DLL. A COM DLL exports both functions such as DllRegisterServer() and DllGetClassObject(), and also the Classes which implements the IUnknown interface. Is this understanding all right? Q3. *.def & *.idl *.def is used to define the functions exported by a Windows DLL in the traditional way, such as DllGetClassObject(). *.idl is used to define the interface implemented by a COM coclass. Thanks in advance.

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• Java ByteBuffer to VB .NET

  - by user1797258

  I have this java code : ByteBuffer p = ByteBuffer.allocate(packet.length - 10 + 14); p.order(ByteOrder.LITTLE_ENDIAN); p.putInt(packet.length); p.putInt(packet.request_id); p.putInt(packet.type); p.put(packet.paylod); p.put((byte) 0); p.put((byte) 0); And i want to translate it to VB .NET I started with this : Dim p(packet.length - 10 + 14) As Byte But after i dont know how to put these variables in the right way

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• R Question: calculating deltas in a timeseries

  - by Jörg Beyer

  I have a timeseries of samples in R: > str(d) 'data.frame': 5 obs. of 3 variables: $ date: POSIXct, format: "2010-03-04 20:47:00" "2010-03-04 21:47:00" ... $ x : num 0 10 11 15.2 20 $ y : num 0 5 7.5 8.4 12.5 > d date x y 1 2010-03-04 20:47:00 0.0 0.0 2 2010-03-04 21:47:00 10.0 5.0 3 2010-03-04 22:47:00 11.0 7.5 4 2010-03-04 23:47:00 15.2 8.4 5 2010-03-05 00:47:00 20.0 12.5 In this example samples for x and y are taken every hour (but the time delta is not fix). The x and y values are always growing (like a milage counter in a car). I need the deltas, how much was the growth in between, something like this: 1 2010-03-04 20:47:00 0.0 0.0 2 2010-03-04 21:47:00 10.0 5.0 3 2010-03-04 22:47:00 1.0 2.5 4 2010-03-04 23:47:00 4.2 0.9 5 2010-03-05 00:47:00 4.8 4.1 And I also need the detlas per time (x and y delta, divided by the time - delta per hour) How would I do this in R?

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• call by value-result in Pascal

  - by Luciano Lorenti

  How can i simulate calling by value-result in this example. Without adding variables and without change a variable name.? Program one; var x:integer; Function two():integer; begin x:=x+1; dos:=x; end; Procedure three(x:integer); begin x:=x+5; x:=two(); end; begin x:=8; trhee(x); write(x); end.

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• Emacs: annoying Flymake dialog box.

  - by baol

  Hello I have the following lines in my ~/.emacs.d/init.el (custom-set-variables '(flymake-allowed-file-name-masks (quote ( ("\\.cc\\'" flymake-simple-make-init) ("\\.cpp\\'" flymake-simple-make-init))))) (add-hook 'find-file-hook 'flymake-find-file-hook) When I open a cc/cpp file that has a Makefile with the following content in the same folder I get proper on-the-fly compilation and error reporting (Flymake will check the syntax and report errors and warnings during code editing) .PHONY: check-syntax check-syntax: $(CXX) -Wall -Wextra -pedantic -fsyntax-only $(CHK_SOURCES) The problem is that when I open a .cc file that has no corresponding Makefile i get an annoying dialog box that warns me about flymake being disabled for every file opened. Is there some hook I can use to disable that warning? Can you provide sample elisp code and explanation on how you found the proper hook?

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• Simple ranking algorithm in Groovy

  - by Richard Paul

  I have a short groovy algorithm for assigning rankings to food based on their rating. This can be run in the groovy console. The code works perfectly, but I'm wondering if there is a more Groovy or functional way of writing the code. Thinking it would be nice to get rid of the previousItem and rank local variables if possible. def food = [ [name:'Chocolate Brownie',rating:5.5, rank:null], [name:'Pizza',rating:3.4, rank:null], [name:'Icecream', rating:2.1, rank:null], [name:'Fudge', rating:2.1, rank:null], [name:'Cabbage', rating:1.4, rank:null]] food.sort { -it.rating } def previousItem = food[0] def rank = 1 previousItem.rank = rank food.each { item -> if (item.rating == previousItem.rating) { item.rank = previousItem.rank } else { item.rank = rank } previousItem = item rank++ } assert food[0].rank == 1 assert food[1].rank == 2 assert food[2].rank == 3 assert food[3].rank == 3 // Note same rating = same rank assert food[4].rank == 5 // Note, 4 skipped as we have two at rank 3 Suggestions?

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• How do I obtain a new stateful session bean in a servlet thread?

  - by FarmBoy

  I'm experimenting with EJB3 I would like to inject a stateful session bean into a servlet, so that each user that hits the servlet would obtain a new bean. Obviously, I can't let the bean be an instance variable for the servlet, as that will be shared. And apparantly injecting local variables isn't allowed. I can use the new operator to create a bean, but that doesn't seem the right approach. Is there a right way to do this? It seems like what I'm trying to do is fairly straightforward, after all, we would want each new customer to find an empty shopping cart.

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• How can I enable Pascal casing by default when using Jackson JSON in Spring MVC?

  - by bhilstrom

  I have a project that uses Spring MVC to create and handle multiple REST endpoints. I'm currently working on using Jackson to automatically handle the seralization/deserialization of JSON using the @RequestBody and @ResponseBody annotations. I have gotten Jackson working, so I've got a starting point. My problem is that our old serialization was done manually and used Pascal casing instead of Camel casing ("MyVariable" instead of "myVariable"), and Jackson does Camel casing by default. I know that I can manually change the name for a variable using @JsonProperty. That being said, I do not consider adding "@JsonProperty" to all of my variables to be a viable long-term solution. Is there a way to make Jackson use Pascal casing when serializing and deserializing other than using the @JsonProperty annotation?

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• POSIX threads and signals

  - by Donal Fellows

  I've been trying to understand the intricacies of how POSIX threads and POSIX signals interact. In particular, I'm interested in: What's the best way to control which thread a signal is delivered to (assuming it isn't fatal in the first place)? What is the best way to tell another thread (that might actually be busy) that the signal has arrived? (I already know that it's a bad idea to be using pthread condition variables from a signal handler.) For reference about why I want this, I'm researching how to convert the TclX package to support threads, or to split it up and at least make some useful parts support threads. Signals are one of those parts that is of particular interest.

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• IIS 6/.Net 2:How can user A get the user cookie for unrelated user B who is in a different session a

  - by jon.ediger

  1) user A goes to the site, creates an account, and logs in 2) user b goes to the site. Rather than having to log in, user b enters as though user b is user a. User b gets access to all of user a's data and can brows the site as user a. Note: user b does not log in. User b just hits the site, and the site returns as if user b is already logged in as user a. Note 2: user a and user b are on distinct computers. Also, static variables are not involved in the code. Setup: IIS 6 .Net 2.0 OutputCache off for the pages in the site

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