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• Confusion regarding a function definition in C

  - by user34790

  I found this function definition void *func(void *param) { } Actually, I have a certain confusion regarding this function definition. What does void * mean in the return type of the function as well as the argument. I am a beginner in C. So please don't mind. Thank you void *func(void *param) { int s = (int)param; .... } Well looking at the above program which I found. I think it should have been int *s = (int *)param; isn't it? I am confused

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• Iterating over a large data set in long running Python process - memory issues?

  - by user1094786

  I am working on a long running Python program (a part of it is a Flask API, and the other realtime data fetcher). Both my long running processes iterate, quite often (the API one might even do so hundreds of times a second) over large data sets (second by second observations of certain economic series, for example 1-5MB worth of data or even more). They also interpolate, compare and do calculations between series etc. What techniques, for the sake of keeping my processes alive, can I practice when iterating / passing as parameters / processing these large data sets? For instance, should I use the gc module and collect manually? Any advice would be appreciated. Thanks!

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• looping thru a list of checkboxes and saving the values, not working properly

  - by Erez

  Hello all, I'm having a bit of a problem with this code. The program gives me a list of checkboxes but a user ID. then u user can change his selection and push the save button (id="btnSaveUserIntersts") and i am trying to save in the hidden textbox all the values of the checkboxes that was choosen. The problem is that i am getting all the time the same selections that came form the database and not getting the new selection that the user made. Can any one tell me what am i doing wrong here? $(document).ready( function() { $('#btnSaveUserIntersts').bind( 'click', function() { var strCheckBoxChecked = new String(); $('input[type=checkbox][checked]').each( function() { strCheckBoxChecked += $(this).val(); strCheckBoxChecked += ','; } ); $('#hidUserInterests').val(strCheckBoxChecked); } ); } ); 10x

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• How can I modify the application file of an application that is currently running (on Linux)?

  - by Hach-Que

  I have an application running called AppFS. This application has an ext2 filesystem just attached to the end of the file (it's positioned so that the application binary exists in a 1MB spacing area, followed by the ext2 data). Now I've got FUSE embedded in the program and I've managed to extract the filesystem out of the application data into a temporary file so that FUSE can mount / use it. The problem I have now is writing the temporary file back into the application file. I get "Text file busy" presumably because the application has locked itself and won't let writes occur. Is there a way I can force the file to become unlocked so I can write data to it? (It's important to note that I'm not changing the application binary area - just rewriting the ext2 component.) It needs to be unlocked without requiring root permissions (unlocked by the same user who started the application).

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• Android app using 2.x APIs that will also run on 1.x

  - by Adam Haile

  I'm working on an Android app in which I would like to use multi-touch. However, I do not want to completely leave out those still running a 1.x OS phone. How do you program the app so that you can use the 2.x multi-touch APIs (or any other higher level API for that matter) and still allow it to gracefully degrade on 1.x systems. If you create a project in Eclipse for 1.x can you even still access the 2.x APIs? Basically I want it to show up in the marketplace and work on all 1.6 and higher phones and just allow access to the higher level functionality if available. Also, if anyone can point me to any data on the number of 1.x devices vs. 2.x devices in use, it would be greatly appreciated.

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• How to read, edit and write xls files, and then export to SQL Server

  - by tuanvt

  I have an excel file that have the list of contacts( about 10 k of them) that I need to push into my SQL Server database. So, I am writing an .net windows program using visual studio 2008 to read the files, generate random password for each contact, and then push these information in to my SQL Server database. It was easy to handle excel file in 2003 but now my computer have office 2007 in it and things seem to changed. I am digging on Microsoft.Office.Interop.Excel but it is seem to be a lot more complicated than before.

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• How do I make TODO comments show up in the task list for C++ projects in Visual Studio 2010?

  - by Chris Simmons

  I'm trying to get my TODO comments to show up in the task list in Visual Studio 2010 for a C++ project, but they don't. I looked at this, but see no caveats other than the TODO comments need to be in the currently-open file. For example, creating a new Win32 console app places this: // TODO: reference additional headers your program requires here in a new file, stdafx.h. However, there's nothing in the task list. I have "Comments" chosen from the drop-down in the task list, but it's always empty. And it's not this problem; I can open the file and be looking at the TODO comment in the code editor and no task is shown. This is not a problem for C# projects as TODO comments show up as designed in those projects; this appears to be an issue specific to C++ projects. What else can I check?

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• Using FILE_FLAG_NO_BUFFERING will return noticeable speed gain?

  - by 9dan

  Recently noticed detail description of FILE_FLAG_NO_BUFFERING flag in MSDN, and read several Google search results about unbuffered I/O in Windows. http://msdn.microsoft.com/en-us/library/aa363858(v=vs.85).aspx I wondering now, is it really important to consider unbuffered option in file I/O programming? Because many programs use plain old C stream I/O or C++ iostream, I didn't gave any attention to FILE_FLAG_NO_BUFFERING flag before. Let's say we are developing photo explorer program like Picasa. If we implement unbuffered I/O, could thumbnail display speed show noticeable difference in ordinary users?

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• Testing what a String token holds

  - by Yiwei Gao

  I am making a calculator and part of this program takes in user String input and tokenizes it (using my own implementation of a Tokenizer class). So now I have a bunch of Token objects and I would like to test each one of them to see if they hold numbers or operators. Is there a way to test to see if they hold operators (ie. +, -, *, /, =, (, ), etc.) without using if (token.equals("+") || token.equals("-") || ... and so on, for each operator? These Token objects are all of type String.

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• Postfix evaluation in C

  - by Andrewziac

  I’m taking a course in C and we have to make a program for the classic Postfix evaluation problem. Now, I’ve already completed this problem in java, so I know that we have to use a stack to push the numbers into, then pop them when we get an operator, I think I’m fine with all of that stuff. The problem I have been having is scanning the postfix expression in C. In java it was easier because you could use charAt and you could use the parseInt command. However, I’m not aware of any similar commands in C. So could anyone explain a method to read each value from a string in the form: 4 9 * 0 - = Where the equals is the signal of the end of the input. Any help would be greatly appreciated and thank you in advance :)

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• syntax error : missing ';' before identifier

  - by numerical25

  I am new to c++, trying to debug the following line of code class cGameError { string m_errorText; public: cGameError( char *errorText ) { DP1("***\n*** [ERROR] cGameError thrown! text: [%s]\n***\n", errorText ); m_errorText = string( errorText ); } const char *GetText() { return m_errorText.c_str(); } }; enum eResult { resAllGood = 0, // function passed with flying colors resFalse = 1, // function worked and returns 'false' resFailed = –1, // function failed miserably resNotImpl = –2, // function has not been implemented resForceDWord = 0x7FFFFFFF }; This header file is included in the program as followed #include "string.h" #include "stdafx.h" #include "Chapter 01 MyVersion.h" #include "cGameError.h"

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• Code compiles etc. but just hangs on run.

  - by Aidan

  Hey guys, My program is meant to parse through a text file, extract relevant data and then save it in a SQL table. I compile it like so.. gcc -o parse parse.c -I/usr/include/mysql -L/usr/lib/mysql -lmysqlclient_r then I run it like so... ./parse > tweets.rss But it just hangs. it doesn't print any printf's I put in to debug. Whats wrong? here is my code... http://pastebin.com/3R45zyMp I'd appreciate any help!

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• How do I write a Guice Provider that doesn't explicitly create objects?

  - by ripper234

  Say I have a ClassWithManyDependencies. I want to write a Guice Provider for this class, in order to create a fresh instance of the class several times in my program (another class will depend on this Provider and use it at several points to create new instances). One way to achieve this is by having the Provider depend on all the dependencies of ClassWithManyDependencies. This is quite ugly. Is there a better way to achieve this? Note - I certainly don't want the Provider to depend on the injector. Another option I considered is having ClassWithManyDependencies and ClassWithManyDependenciesProvider extend the same base class, but it's butt ugly.

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• Call function based off of a string in Lisp

  - by powerj1984

  I am passing in command line arguments to my Lisp program and they are formatted like this when they hit my main function: ("1 1 1" "dot" "2 2 2") I have a dot function and would like to call it directly from the argument, but this isn't possible because something like (funcall (second args)...) receives "dot" and not dot as the function name. I tried variations of this function: (defun remove-quotes (s) (setf (aref s 0) '"")) to no avail, before realizing that the quotes were not really a part of the string. Is there a simple way to do this, or should I just check each string and then call the appropriate function? Thanks!

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• Structure within union and bit field

  - by java

  #include <stdio.h> union u { struct st { int i : 4; int j : 4; int k : 4; int l; } st; int i; } u; int main() { u.i = 100; printf("%d, %d, %d", u.i, u.st.i, u.st.l); } I'm trying to figure out the output of program. The first outputs u.i = 100 but I can't understand the output for u.st.i and u.st.l. Please also explain bit fields.

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• directory monitoring

  - by foz1284

  Hi, What is the best way for me to check for new files added to a directory, I dont think the filesystemwatcher would be suitable as this is not an always on service but a method that runs when my program starts up. there are over 20,000 files in the folder structure I am monitoring, at present I am checking each file individually to see if the filepath is in my database table, however this is taking around ten minutes and I would like to speed it up is possible, I can store the date the folder was last checked - is it easy to get all files with createddate last checked date. anyone got any Ideas? Thanks Mark

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• C# compiler fails to recognize a class is implementing an interface

  - by Freek

  The following code fails to compile (using VS2010) and I don't see why. The compiler should be able to infer that List is 'compatible' (sorry for lack of a better word) with IEnumerable, but somehow it doesn't. What am I missing here? interface ITest { void Test(); } class TestClass : ITest { public void Test() { } } class Program { static void Test(IEnumerable<ITest> tests) { foreach(var t in tests) { Console.WriteLine(t); } } static void Main(string[] args) { var lst = new List<TestClass>(); Test(lst); // fails, why? Test(lst.Select(t=>t as ITest)); //success Test(lst.ToArray()); // success } }

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• Finding data file location while using Microsoft Test Framework

  - by Nair

  I have been using NUnit and now I am switching to the Microsoft Unit Test frame work. In my test project I have a folder called TestData and I kept all my test input data files there. I want to use that files for my unit testing. In my test code, I am using Application name space and assembly name space but I can not get to the data folder directly until unless I write a code to find and replace some string to point to the data folder. I am sure someone might have run into the same problem, is the solution to change the path through program or is there a API call which will let us get to executing assembly folders? Thanks,

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• How to check that a regular expression fall into infty loop or not?

  - by Sorush Rabiee

  I'm trying to learn and hopefully use regular expression with Qt. I found that some patterns cause handler to fall into loop. for example searching \b\b in a text, never will terminate. and number of these expressions is infinite (\b\b\b,\b\b\b\b and so on). I'd like to determine and control all invalid expressions. Is there an algorithm to distinguish valid and invalid expressions? If not, how can I prevent my program from falling into an infinite loop?

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• Visual Studio swapping code between projects?!?!?!?!??!

  - by Tom

  Are there any known issues with visual studio and code being swapped between projects? I had a project running in VS2008 and when i went back to it, the code from another project had been swapped in the Program.cs class. I havent made any mistakes, im not talking about some code- i mean the whole project had been swapped out. Its as if the .proj files or .soln files had been swapped from their project folders??? EDIT Ive restarted laptop, opened the code again and its still showing the wrong code BUT when i execute it, its the right code?!?!?!

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• (conditional) Multiple Event Handlers C#

  - by gjk

  A portion of my program requires a "flag" retrieval, that is I am fetching a value that is either True or False, and based on this return value two things could follow. 1) The flag is true, aka "go ahead", and I retrieve data from a database. 2) The flag is false, and I want to prevent the data from being retrieved. Now, this check has to be performed before any function that would call upon the database in question. I decided to implement this check in the form of an event handler attached to GUI objects that would trigger this data inquiry. This check event handler is called first upon necessary events, and my question is: How do I stop subsequent event handlers from firing if the FIRST event handler (my flag checker) comes up FALSE? Thanks

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• I need guidance in building my first C# project

  - by grokker

  Hi I'm a PHP developer and I have some experience with Java. I'm trying to learn C# and my first project would be a program that starts the timer on a PC by clicking a button on another PC in the network. The problem is, I don't know where to start? What do I need to read up on? The OS for both PCs is Windows XP so they're desktop apps. I'd appreciate any help from you C# gurus. I hope my start as a C# programmer would be successful. Thank you!

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• need a virtual template member workaround

  - by yurib

  Hello, I need to write a program implementing the visitor design pattern. The problem is that the base visitor class is a template class. This means that BaseVisited::accept() takes a template class as a parameter and since it uses 'this' and i need 'this' to point to the correct runtime instance of the object, it also needs to be virtual. I'd like to know if there's any way around this problem. template <typename T> class BaseVisitor { public: BaseVisitor(); T visit(BaseVisited *visited); virtual ~BaseVisitor(); } class BaseVisited { BaseVisited(); template <typename T> virtual void accept(BaseVisitor<T> *visitor) { visitor->visit(this); }; // problem virtual ~BaseVisited(); }

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• need help using 2 mfc projects in one solution

  - by adir

  hi, ive created the first project as mfc application and i have tried to enter the solution another project which created as mfc dll. when i running program the gui from the first solution(demodlg) is shows up. and i want that in a prss of a button in the gui the second gui(CAnalyzerDialog) will show up. i've tried a lot of options and i cant get it done right. the last option ive tried is this code : CAnalyzerDialog dlg; dlg.Create(CAnalyzerDialog::IDD); please help. thank you for your time

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• python: creating a list inside a dictionary

  - by user1871081

  I just started using python and I'm trying to create a program that will read a file that looks like this: AAA x 111 AAB x 111 AAA x 112 AAC x 123 ... the file is 50 lines long and I'm trying to make the letters into keys in a dictionary and the numbers lists that correspond with the keys. I want the output to look like this: {AAA: ['111', '112'], AAB: ['111'], AAC: [123], ...} This is what I've tried file = open("filename.txt", "r") readline = file.readline().rstrip() while readline!= "": list = [] list = readline.split(" ") j = list.index("x") k = list[0:j] v = list[p + 1:] d = {} if k in d == False d[k] = [] d[k].append(v) else d[k].append(v) readline = file.readline().rstrip() I keep getting syntax errors on my if statement and I can't figure out what I've done wrong.

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