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  • Using sem_t in a Qt Project

    - by thauburger
    Hi everyone, I'm working on a simulation in Qt (C++), and would like to make use of a Semaphore wrapper class I made for the sem_t type. Although I am including semaphore.h in my wrapper class, running qmake provides the following error: 'sem_t does not name a type' I believe this is a library/linking error, since I can compile the class without problems from the command line. I've read that you can specify external libraries to include during compilation. However, I'm a) not sure how to do this in the project file, and b) not sure which library to include in order to access semaphore.h. Any help would be greatly appreciated. Thanks, Tom Here's the wrapper class for reference: Semaphore.h #ifndef SEMAPHORE_H #define SEMAPHORE_H #include <semaphore.h> class Semaphore { public: Semaphore(int initialValue = 1); int getValue(); void wait(); void post(); private: sem_t mSemaphore; }; #endif Semaphore.cpp #include "Semaphore.h" Semaphore::Semaphore(int initialValue) { sem_init(&mSemaphore, 0, initialValue); } int Semaphore::getValue() { int value; sem_getvalue(&mSemaphore, &value); return value; } void Semaphore::wait() { sem_wait(&mSemaphore); } void Semaphore::post() { sem_post(&mSemaphore); } And, the QT Project File: TARGET = RestaurantSimulation TEMPLATE = app QT += SOURCES += main.cpp \ RestaurantGUI.cpp \ RestaurantSetup.cpp \ WidgetManager.cpp \ RestaurantView.cpp \ Table.cpp \ GUIFood.cpp \ GUIItem.cpp \ GUICustomer.cpp \ GUIWaiter.cpp \ Semaphore.cpp HEADERS += RestaurantGUI.h \ RestaurantSetup.h \ WidgetManager.h \ RestaurantView.h \ Table.h \ GUIFood.h \ GUIItem.h \ GUICustomer.h \ GUIWaiter.h \ Semaphore.h FORMS += RestaurantSetup.ui LIBS += Full Compiler Output: g++ -c -pipe -g -gdwarf-2 -arch i386 -Wall -W -DQT_GUI_LIB -DQT_CORE_LIB -DQT_SHARED - I/usr/local/Qt4.6/mkspecs/macx-g++ -I. - I/Library/Frameworks/QtCore.framework/Versions/4/Headers -I/usr/include/QtCore - I/Library/Frameworks/QtGui.framework/Versions/4/Headers -I/usr/include/QtGui - I/usr/include -I. -I. -F/Library/Frameworks -o main.o main.cpp In file included from RestaurantGUI.h:10, from main.cpp:2: Semaphore.h:14: error: 'sem_t' does not name a type make: *** [main.o] Error 1 make: Leaving directory `/Users/thauburger/Desktop/RestaurantSimulation' Exited with code 2. Error while building project RestaurantSimulation When executing build step 'Make'

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  • Flex - Custom Component - Percentage Width/Height

    - by Hamish
    I am trying to create a Custom Flex Component using the Flex Component framework: http://www.adobe.com/livedocs/flex/3/html/help.html?content=ascomponents_advanced_3.html. All good components allow you to define their dimensions using percentage values using: MXML: TextInput width="100%" or Actionscript at runtime: textinp.percentWidth = 100; My question is how do you implement percentage width/height in the measure() method of your custom component? More specifically, these percentages are converted to pixels values at some stage, how is this done?

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  • Windows XP boot: black screen with cursor after BIOS screen

    - by Radio
    Here is a weird one, Got computer with Windows XP. It's getting stuck on a black screen with cursor blinking. What did I do: - Boot from installation CD (recovery option - command line): chkdsk C: /R copy D:\i386\ntdetect.com c:\ copy D:\i386\ntldr c:\ fixmbr fixboot Chkdsk showed 0 bad sectors and no problems during scan. dir on C:\ shows all directories and files in place (Windows, Program Files, Documents and Settings). BIOS shows correct boot drive. Still does not boot. Not sure what to think of. Please help. UPDATE: Just performed these steps: Backed up current disk C: (without MBR) using True Image to external hard drive Ran Windows XP clean installation with deleting all partitions and creating new one. Hard drive booted fine into Windows GUI installation!!! Then: Interrupted installation. Booted from True Image recovery CD and restored archive of disk C to an new partition. Same issue with black screen.

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  • Compiling SDL Games on Mac

    - by dejai
    I have a mac and I am trying to compile my projects. The standard on the wiki: g++ sdl.cpp -lSDLmain -lSDL -framework Cocoa does not seem to be working it returns that it cannot find -lSDL and -lSDLmain. Any help would be greatly appreciated.

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  • Custom UIBarButtonItem with quartz

    - by burki
    Hi! How can I draw a button with quartz that has exactly the same style as a UIBarButtonItem. The button should be able to show different colors. I downloaded the Three20 project, but this project is really complex, you'd need a lot of time to overlook the whole framework. I just want to draw a custom UIBarButtonItem. Thanks for help.

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  • Is it possible for root to execute a command as non-root

    - by adnan kamili
    I am root user and suppose i want to run any application as another user. is it possible, without switching to another user. Something like # google-chrome user=abc I am actually executing a cli program as a non root user. I have set the sticky bit on and i am using setuid. So the program runs with root privileges. Now i am using system() with in the program to invoke gui app. But i dont want to run it as root. so i want to temporarily drop root privileges only for that call.

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  • Email setup on dedicated servers

    - by zaf
    Am thinking seriously of renting a dedicated server. Now I know how to setup apache and the underlying scripting engines and databases but I'm a bit clueless with how the emails would work. Currently, I'm on a shared hosting account and I get a fancy gui which allows me to nicely add a domain, setup nameservers and then the emails for all domain names with either simple forwarding or the full account which also has a webmail app behind it. What options do I have? Are there non complicated ways to have the same email setup experience? Or are there reliable external providers I could use? My past experiences with sendmail/postfix have always been fuzzy - not exactly knowing whats happening behind the scenes.

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  • Outside classes accessing package-private methods

    - by Jake
    Suppose I have a class in my package org.jake and it has a method with default access (no modifier). Then the method is visible inside the package only. However, when someone receives the jar of my framework, what is to stop them from writing a new class, declaring its package as org.jake, and using my supposedly invisible method? In other words, is there anything I can do to prevent them from doing that?

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  • front end to linux std mailbox for development purposes

    - by Fabio
    I am actually a software developer, do have a fair amount of linux experience as a user though since 1997. I am normally on stackoverflow.com, please excuse me if this question isn't appropriate here. I am working on a web project. We send out emails. I work locally on a linux box. When coding I use my local mailboxes to check what's been sent. Emails sent out to valid email addresses are not arriving at my official mailbox; they might be stopped by the provider's mail servers (gmail, yahoo). Now, we are sending out HTML mails too. I need to check how they look like. Is there a GUI frontend to the standard linux BSD mailbox? Or should I install some IMAP/POP server for this? Will such server get the emails sent to username@localhost ? Thanks for any suggestion

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  • RESTful WebServices with Kohana PHP 3

    - by Miller
    Hi, Is it possible to make restful services with kohana 3 , i reviewed the source and found an abstract class Kohana_Controller_REST, how to use it ? If someone can post a snippet with routing as Example code, it will be very appreciated. Also, the lack of documentation on KO3 is making me crazy, if someone knows a well documented, fast and proven PHP framework to use with an 100% javascript Frontend, just let me know, but i would like to stick with Kohana because of the powerful ORM lib. Thanks.

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  • how to merge stripped symbols with binary?

    - by Bernd Schmickler
    I compiled the Qt Framework with debugging enabled, but the script stripped the debugging symbols from the libraries and saved them as *.debug files -- just like here. Sadly I need these symbols inside the .so files, so I can continue working with them. There seems no way to teach my debugger to load external (non-PDB) symbols. So another way of solving my problem might be converting the .debug files to PDB format, which might also be a problem. Thank you very much!

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  • Can't login into Fedora 14 (XFCE) desktop. For the second time.

    - by bubba88
    Hello. I'm experiencing a problem with my Fedora 14 XFCE spin, which doesn't seem to let me pass the login screen: I enter my password for my user record, authentication passes (no 'Authentication Failure' message, which was when I tried to login as 'root' without root login enabled), and the screen becomes black (command line) for a couple of seconds and (voila!) my login screen emerges again. I did nothing to cause that, it just suddenly logged me out when I was editing window manager settings via XFCE's built-in GUI utility (choosing window decorations style, from the listbox on the left) For the first time, I had to boot from live CD and do a fresh install, but I don't really want to do that again :) Is there some way to repair this (maybe login via command line and reset window manager settings, I don't know really)? Thank you very much in advance!

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  • VB.Net IO performance

    - by CFP
    Having read this page, I can't believe that VB.Net has such a terrible performance when it comes to I/O. Is this still true today? How does the .Net Framework 2.0 perform in terms of I/O (taht's the version I'm targeting)?

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  • CentOS 5.8 Server, manual install PHP 5.2.17

    - by Shiro
    I would like manually install PHP 5.2.17. I manage to install httpd and mysql. But when I want to PHP 5.2.17, I could not found a proper guide. These the step I had done with a fresh installation of CentOS 5.8 x86_64 (server & server GUI) yum install httpd httpd-devel /etc/init.d start OK /etc/init.d stop OK yum install mysql mysql-server mysql-devel yum remove php yum groupinstall "Development Tools" yum install libxml2-devel wget http://www.php.net/release/php5.2.17.zip to get php5.2.17 (client requirement must use this version) cd php5.2.17 ./configure --with-apxs2=/usr/sbin/apxs --with-mysql=/usr/local This is the area I confuse. I could not found the /usr/sbin/apxs in my system. I do another Google search on how to manually install PHP, they pointed using ./configure --with-apxs2=/usr/local/apache2/bin/apxs --with-mysql Both localtino I also cannot find apxs or apache2. I scare I make any mistake on it. Please help and guide on this. I am newbie in CentOS

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  • Simple "Long Polling" example code?

    - by dbr
    I can find lots of information on how Long Polling works (For example, this, and this), but no simple examples of how to implement this in code. All I can find is cometd, which relies on the Dojo JS framework, and a fairly complex server system.. Basically, how would I use Apache to serve the requests, and how would I write a simple script (say, in PHP) which would "long-poll" the server for new messages? The example doesn't have to be scaleable, secure or complete, it just needs to work!

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  • Subdomains for different applications on Windows Server 2008 R2 with Apache and IIS 7 installed

    - by Yusuf
    I have a home server, on which I have installed Apache, and several other applications that have a Web GUI (JDownloader, Free Download Manager). In order to access each of these apps (whether be it from the local network or the Internet), I have to enter a different port, e.g., http://server:8085 or http://xxxx.dyndns.org:8085 for Apache http://server:90 or http://xxxx.dyndns.org:90 for FDM http://server:8081 or http://xxxx.dyndns.org:8081 for JDownloader I would like to be able to access them using sub-domains, e.g, http://apache.server or http://apache.xxxx.dyndns.org for Apache, http://fdm.server or http://fdm.xxxx.dyndns.org for FDM, http://jdownloader.server or http://jdownloader.xxxx.dyndns.org for JDownloader First of all, would it be possible like I want it, i.e., both from LAN and Internet, and if yes, how? Even if it's possible only for Internet, I would like to know how to do it, if there's a way.

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  • irc client with good logging/autoconnect/authorize upon connect capabilities

    - by ldigas
    I need an IRC client with good logging / autoconnect upon disconnect / authorize upon succesful connect capabilities. Simply, something that will sit in the background and record some channels so I can quickly reread them later. Windows XP platform. Is there something like that on the market ? I knew of one or two 'in the old days' (of ibm terminals :-), but nowadays, all I see are simple gui clients without even the basic features. I know of mIRC (with which I've had some problems with reconnecting after server drops). Anything better out there ? Just to clarify ... I'm not interested in a general irc client ... for that I have mIRC, with which I'm reasonably happy ... I just need something which is really good at the above mentioned three things.

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  • How does Asp.Net MVC compare to Java MVC frameworks

    - by sumek
    I've started my career as a Java developer, then moved to Asp.NET and recently to the Asp.Net MVC, which I like a lot. When developing in Java I used Struts1, which I remember as a hideous framework with loads of XML. Now I suspect that Java MVC frameworks have moved on from the Struts times. So how do modern Java MVC frameworks compare to the ASP.Net MVC? Which one of them is the most similar to the Asp.Net MVC?

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  • How to start Android Kernel programming?

    - by Rajapandian
    Hi All, I am 6 months experience in Android, use to develop simple UI based application. Now i want to write application targeting the Android core Kernel.For example i want to develop a Framework which is not present in Android.To achieve that we have to write the code for the Kernel. I dont know where and how to start the Android Kernel Programming. If anybody knows the way to start it please help me. Regards, Rajapandian.K

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  • How to let css selector exclude an element ?

    - by Tony
    For example I have a css style like this : input.validation-passed {border: 1px solid #00CC00; color : #000;} The javascript validation framework I use will inject every input tag with a class="validation-passed" .For the elements like <input type='text' /> ... , this is ok , but for <input type='button' /> , I want this is not applied , how should I do this ?

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  • Splitting/Merging 3gp files using a java library

    - by user141146
    Hi, I'm wondering if there's a java library out there that can manipulate 3gp files. Mostly I'm interested in splitting or merging existing video files. I've looked at JMF (java media framework), but it doesn't support 3gp…and FFmpeg looks promising, but it's not clear that the library allows splitting/merging of existing files. Does such a library exist?

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  • How to pretend to be a Printer on iOS like the Apps Save2PDF or Adobe® CreatePDF?

    - by Lindemann
    I want to convert HTML to PDF on an iOS Device... ...but I dont want to load my HTML in a UIWebView, take a snapshot and generate an ugly PDF from this snapshot picture...because the text must be selectable for my purpose. I wonder how Apps like Save2PDF or Adobe® CreatePDF are able to converting multiple files into PDF and save them. I guess they don't generate the PDF's by their own, but get them from Apples Printing Framework. How does this Apps work?

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  • Ruby gem already activated

    - by Eric the Red
    How can I de-activate the newer version of cucumber, or get this to work with the earlier version? user$ rake features (in /Users/user/Project) /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/bin/ruby -I "/Library/Ruby/Gems/1.8/gems/cucumber-0.6.1/lib:lib" "/Library/Ruby/Gems/1.8/gems/cucumber- 0.6.1/bin/cucumber" --format pretty can't activate cucumber (= 0.4.4, runtime) for [], already activated cucumber-0.6.1 for [] (Gem::LoadError) /Library/Ruby/Site/1.8/rubygems.rb:280:in `activate'

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