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• On MacOSX, in a C++ program, what guarantees can I have on file IO

  - by anon

  I am on MacOSX. I am writing a multi threaded program. One thread does logging. The non-logging threads may crash at any time. What conventions should I adopt in the logger / what guarantees can I have? I would prefer a solution where even if I crash during part of a write, previous writes still go to disk, and when reading back the log, I can figure out "ah, I wrote 100 complete enties, then I crashed on the 101th". Thanks!

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• What must one know when approaching web development?

  - by Tal Koren

  I just started working as a novice Web Developer. I know PHP pretty well, as well as some basic jQuery. Anyway, my boss told me I should explore and learn about MVC, Memcache, Design Patterns, how Apache servers work and how to set one up etc. What I want to ask is actually this: What should I learn further? Web Development is a big area and most odds are that I'll never stop learning, but what are the basics I should learn about? What are the fundamentals? Currently I'm focusing on Server Side Development, but a very big part of me also wants to become a front-end ninja, so please consider that in your comments. Thanks in advance, you rock. :)

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• Silverlight beyond the basics

  - by Braulio Díez Botella

  Once I have learned the basics of Silverlight, I realized that there was still a lot to learn, architecture, patterns & practices, data access technologies… BUT… there’s plenty of material out there and few available time. I have compiled a set of articles/web casts / posts I found pretty useful for me, and defined a “learning roadmap”.   About the learning road map:    About the links: Basics MVVM Pattern: MSDN Magazine Basics RIA Services: RIA Services Intro RIA Services and Visual Studio 2010 MVVM + PRISM: MVVM + PRISM  MEF: MSDN Magazine RIA Services + MVVM: Mix10 RIA Services + MVVM + MEF: Shawn Wildermuth Series (1) Shawn Wildermuth Series (2) Shawn Wildermuth Series (3) Shawn Wildermuth Series (4) Some of them are based on Beta version of the products, but the core concepts are there and quite well explained. Please if you have other superb references add it on the comments section, hope to build a “version 2” of this post including or your feeback, thanks.

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• Oracle’s Web Experience Management

  - by Christie Flanagan

  Today’s guest post on Oracle’s Web Experience Management comes from a member of our WebCenter Evangelist team, Noël Jaffré, a Principal Technologist based in France.Oracle’s Web Experience Management (WEM) solution enables organizations to optimize the online channel for driving marketing and customer experience management success. It empowers business users to manage the web presence and create rich and engaging online experiences for customers and prospects. Oracle's WEM platform provides a framework to simplify the integration of Oracle, third-party and custom-built applications. This framework essentially allows the creation and integration of applications using one single business interface called the WEM interface. It includes the following: Single sign-on access control for all integrated applications using the Central Authentication Service (CAS) component. A single centralized administration window for user, role, and native applications management including site management. Community server management, gadget server management as well as management for partner integrated technologies. A Representational State Transfer (REST) API for accessing WebCenter Sites data. REST services are supported on both Oracle WebCenter Sites and Oracle WebCenter Sites Satellite Server to leverage the satellite server cache. All REST requests are cached for web consuming applications as well for the high performance delivery of native applications on the mobile channel. Oracle WebCenter Sites’ Web Experience Management environment enables organizations to deliver a compelling online experience to customers by simplifying the deployment and management of sophisticated and engaging websites. The WebCenter Sites platform automates the entire process of managing web content including: Authoring:  Business users can easily contribute and manage web content in real-time, with intuitive interfaces and drag-and-drop content authoring and layout capabilities designed for the non-technical user. Contextual Content Targeting: Marketers are empowered to create and manage targeted campaigns with relevant recommendations and promotions based on the context of the session of the visitor such as his or her navigation history, user profile, language, location or other information shared during the visitor session. Content Publishing and Deployment: It offers advanced multi-site management capabilities for departmental or regional sites, as well as strong multi-lingual and multi-locale content management. The remote satellite server caching infrastructure provides high-performance, distributed caching, tuned to deliver high-volume, targeted and multi-lingual sites. Analytics and Optimization: Business users and marketers have the ability to measure the effectiveness of their online content and campaigns at a granular level. Editors and marketers can immediately determine whether a given article or promotion is relevant to a particular customer segment. User-generated Content: Marketers can enable blogs, comments, rating and reviews on the website.  All comments and reviews posted to the website can be moderated from the administrator interface either manually or automatically using filters, whitelists, blacklists or community based moderation. Personalized Gadget Dashboards:  Site managers can deploy gadgets, small applications using web content, individually or as part of dashboards containing multiple gadgets.  These gadget dashboards enable site visitors to create their own “MyPage” on a given site where they can select and customize the gadgets that the site administrator has made available.  Any gadget that conforms to the iGoogle/OpenSocial standard can be made available to site visitors, or they can be created within the WEM interface. Oracle's WEM platform also provides a unique environment for the delivery of a rich, multichannel online experience for site visitors through its advanced management modules for mobile. With Oracle’s WEM solution, it’s easy to control branding and deliver a consistent message while repurposing web content for publication to mobile devices, kiosks and much more. This distinctive approach provides: HTML5 Delivery: HTML5 delivery which includes native support for adaptive design that responds to the user’s computer screen resolution and orientation. The approach is less driven by the particular hardware and more driven by the user’s interactions with the device. In other words, this approach takes both the screen interactions (either cursor or touch) and screen sizes and orientation into consideration. A Unique Native Mobile Extension Environment for Contributors: From the WEM interface, a contributor can directly manage their mobile channel, using the tooling already in place for driving the traditional web presence. This includes the mobile presentation, as well as mobile insite editing, drag and drop page layout, and in-context recommendations and personalization. Optimized REST APIs for High Performance Content Delivery on Native Mobile Device Applications: WebCenter Sites’ REST API uses the underlying HTTP methods (GET, POST, PUT, DELETE) to interact with resources. Resources support two types of input and output formats -- XML and JSON. REST calls are customizable to optimize the interactions between the content repositories and the client applications. Caching is essential to decrease network loads and improve overall reliability and usability of the applications and user interactions. REST results are cached through the highly efficient Oracle WebCenter Sites caching architecture.

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• Open World 2012

  - by jeffrey.waterman

  For those of you fortunate enough to be attending this year's Oracle OpenWorld here is a sessions I recommend carving time out of your hectic schedule to attend: Public Sector General Session (session ID#: GEN8536) Wednesday, October 3, 10:15 a.m.–11:15 a.m., Westin San Francisco, Metropolitan III Room Speakers, Mark Johnson, SVP Oracle Public Sector; Peter Doolan, CTO Oracle Public Sector; Robert Livingston, founding partner of Livingston Group and former member of the US Congress. Join Mark Johnson for an update on Oracle in government. Mark will be joined by Peter Doolan and Robert Livingston to discuss current topics facing governments and how Oracle can help organizations achieve their goals. I'll be posting more interesting sessions as I peruse the conference agenda over the next week or so.  If you see an interesting session, please feel free to share your suggestions in the comments section.

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• Help with algorithmic complexity in custom merge sort implementation

  - by bitcycle

  I've got an implementation of the merge sort in C++ using a custom doubly linked list. I'm coming up with a big O complexity of n^2, based on the merge_sort() slice operation. But, from what I've read, this algorithm should be n*log(n), where the log has a base of two. Can someone help me determine if I'm just determining the complexity incorrectly, or if the implementation can/should be improved to achieve n*log(n) complexity? If you would like some background on my goals for this project, see my blog. I've added comments in the code outlining what I understand the complexity of each method to be. Clarification - I'm focusing on the C++ implementation with this question. I've got another implementation written in Python, but that was something that was added in addition to my original goal(s).

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• Multi-Device Development in Visual Studio

  - by Daniel Moth

  You've read on Soma's blog post that Microsoft is broadening Visual Studio's reach to other platforms (including for example Android)…  specifically this is what Soma wrote: "With bring-your-own-device trends in the enterprise, and heterogeneity in the consumer mobile device market, developers are increasingly focused on building apps that can target a variety of devices. We are committed to enabling developers to build apps for this heterogeneous, mobile-first world with Visual Studio for the technology of your choice - whether .NET, C++ or JavaScript." If you live in Washington state in the USA (or are willing to relocate here) I am looking for a Program Manager to help with this effort – read the rest of the job description here which is also where you can apply for the position (or email me). Comments about this post by Daniel Moth welcome at the original blog.

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• SQL SERVER Find Most Active Database in SQL Server DMV dm_io_virtual_file_stats

  Few days ago, I wrote about SQL SERVER Find Current Location of Data and Log File of All the Database. There was very interesting conversation in comments by blog readers. Blog reader and SQL Expert Sreedhar has very interesting DMV presented which lists the most active database in SQL Server. For quick reference he [...]...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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• Mobile redirect strategy

  - by Kevin

  Looking for help on deciding how to redirect users to a mobile optimized version of my site (m.mysite.com). Looking at two methods: Server configuration (.htaccess or even varnish) Webapp (php) The problem I see with #1 is with the "view full site" link on the mobile site. If a user clicks that link and they go to mysite.com won't the server just redirect them back to m.mysite.com? For #2 I could create a cookie that is checked in addition to the user agent. Any suggestions/comments? Is there a better way to "remember" if the user clicked "visit full site"? Thanks, Kevin

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• Ask the Readers: What’s the First Thing You Do After Installing a New OS?

  - by Jason Fitzpatrick

  You’ve just booted up your new OS for the first time after a fresh install. What’s the first thing you do? Install specific apps? Tweak settings? Bask in the new-computer-smell of an uncluttered OS? Once a week we put a question before the How-To Geek readership to give you all a chance to share your knowledge and tips with your fellow readers. This week we want to hear about your tips and tricks for whipping a new OS installation into shape. Whether you’ve just installed Windows, Mac OS X, or Linux, we’re curious what kind of computer-warming rituals you visit upon your new OS. Sound off in the comments below and then check back in on Friday for the What Your Said roundup.  How to Enable Google Chrome’s Secret Gold IconHow to Create an Easy Pixel Art Avatar in Photoshop or GIMPInternet Explorer 9 Released: Here’s What You Need To Know

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• Which Free Online Antivirus Scanner is the Best? [Comparison Test and Results]

  - by Asian Angel

  There are times when an online or supplementary scanner can be very useful when cleaning up an infected computer or just to get a second opinion on the security of your system. With this purpose in mind, the good folks over at the 7 Tutorials blog decided to do a test using the ten most popular online security scanners to see what worked the best and what did not. The following scanners were used for the test: Bitdefender QuickScan, BullGuard Online Scanner, Comodo Cloud Scanner, ESET Free Online Scanner, F-Secure Online Scanner, Kaspersky Security Scan, McAfee Security Scan Plus, Norton Security Scan, Panda ActiveScan and Trend Micro HouseCall. Are there any online or supplementary scanners that you use and depend on? Do you agree or disagree with the results? Let us know in the comments! Test Comparison – What is the Best Free Online Antivirus Scanner? [7 Tutorials] HTG Explains: Why Linux Doesn’t Need Defragmenting How to Convert News Feeds to Ebooks with Calibre How To Customize Your Wallpaper with Google Image Searches, RSS Feeds, and More

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• Boost C++ Singleton error LNK2001: unresolved external symbol "private: static long Nsp::HL::flag" (

  - by Soós Roland

  I try to create a multi-threaded singleton pattern class. Header: class HL{ public: static HL* getInstance(); ......... private: static HL* instance; static boost::once_flag flag; HL(); static void initOnce(); } CPP: HL* HL::instance = NULL; HL* HL::getInstance(){ if(instance == NULL){ boost::call_once(flag, initOnce); } return instance; } void HL::initOnce(){ instance = new HL(); } I get this error: error LNK2001: unresolved external symbol "private: static long Nsp::HL::flag" (?flag@HL@Nsp@@0JA) What's wrong?

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• linux pthread_suspend

  - by johnnycrash

  Looks like linux doesnt implement pthread_suspend and continue, but I really need em. I have tried cond_wait, but it is too slow. The work being threaded mostly executes in 50us but occasionally executes upwards of 500ms. The problem with cond_wait is two-fold. The mutex locking is taking comparable times to the micro second executions and I don't need locking. Second, I have many worker threads and I don't really want to make N condition variables when they need to be woken up. I know exactly which thread is waiting for which work and could just pthread_continue that thread. A thread knows when there is no more work and can easily pthread_suspend itself. This would use no locking, avoid the stampede, and be faster. Problem is....no pthread_suspend or _continue. Any ideas?

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• Is flash game development not considered 'proper' game development?

  - by humbleBee

  I've come across this a couple of times. That flash game development is not 'proper' game development when compared to XNA or even Unity. Mentioned here: Need guidelines for studying Game Development Also here in some comments : Where to start with game development? This judgement also befalls java, according to some. Is it because in flash its so easy to draw graphics and to import and add on to the stage any element we want and also because flash needs a 'container program' to run and others don't? But flash is by far way easier to 'distribute' than any other of those mentioned above. Maybe except for iphone or android games.

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• Zelda Adventure is an Epic Legend of Zelda Minecraft Game

  - by Jason Fitzpatrick

  What do you get when you combine a passion for The Legend of Zelda and Minecraft? A playable Zelda epic built entirely within Minecraft. Minecraft enthusiast Gary520 has invested some serious time into an amazing rendition of the Legend of Zelda universe done entirely in Minecraft. Zelda Adventure combines elements from across the Legend of Zelda games including characters, weapons, quests, and more. Watch the trailer above to see it in action. Currently the game is not in public release but you can grab a beta release with the first five dungeons on the Minecraft forums here (the Minecraft site seems to be down for maintenance, if anyone has a mirror to the file throw a link in the comments section). Zelda Adventure Trailer [YouTube via Wired] What is a Histogram, and How Can I Use it to Improve My Photos?How To Easily Access Your Home Network From Anywhere With DDNSHow To Recover After Your Email Password Is Compromised

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• MSVC 2008 - Unresolved External errors with LIB but only with DLL, not with EXE project

  - by Robert Oschler

  I have a DLL that I am trying to link with a libjpeg LIB using MSVC 2008 that is generating Unresolved External Symbol errors for the libjpeg functions. I also have a test project that links with the exact same libjpeg library file and links without error and runs fine too. I have triple-checked my LIB path and dependent LIBS list settings and literally copy and pasted them from the EXE project to the DLL project. I still get the errors. I do have the libjpeg include headers surrounded by extern "C" so it is not a name mangling issue and the unresolved external warnings show the "missing" libjpeg functions as undecorated (just a leading underscore and the @ sign parameter byte count suffix after each name). What could make the linker with the DLL project be unable to find the functions properly when the test EXE project has no trouble at all? I'm using the pre-compiled 32-bit static multi-threaded debug library which I downloaded from ClanLib. Thanks, Robert

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• Silverlight HVP on Silverlight TV

    The Silverlight HyperVideo Project has made two guest appearances on Silverlight TV.  In the first, I talk with John Papa about the project itself and how it has evolved. Then, during Mix, Tim Heuer and I sat down with John to discuss Whats New In Silverlight 4, and I managed to sneak in a few comments about the HVP as well. Silverlight TV has numerous great interviews, and is quickly becoming a valued asset throughout the Silverlight community.  Tens of thousands of...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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• FCGI htaccess handler

  - by sharvey

  I'm trying to setup django on a shared hosting provider. I followed the instructions on http://helpdesk.bluehost.com/index.php/kb/article/000531 and almost have it working. The problem I'm facing now is that the traffic is properly routed throught the fcgi file, but the file itself shows up as plain text in the browser. If I run ./mysite.fcgi in the ssh shell, I do get the default django welcome page. my .htaccess is: AddHandler fastcgi-script .fcgi RewriteEngine On RewriteCond %{REQUEST_FILENAME} !-f RewriteRule ^(.*)$ mysite.fcgi/$1 [QSA,L] and mysite.fcgi: #!/usr/bin/python2.6 import sys, os os.environ['DJANGO_SETTINGS_MODULE'] = "icm.settings" from django.core.servers.fastcgi import runfastcgi runfastcgi(method="threaded", daemonize="false") thanks.

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• Visual Studio Async CTP

  - by Daniel Moth

  While most of the buzz at the recent PDC here at Microsoft's headquarters has been about Windows Azure and Windows Phone, there is a truly noteworthy technology that as a .NET developer (of any kind of application) you should pay attention to, even in its early technology preview stage: Visual Studio Async CTP. I could provide many more direct links, but you do not need them: just visit the home page of this technology to download whitepapers, watch videos on how this technology integrates with C# and with VB, (through the new async and await language keywords) as well as videos on how the technology works under the covers (based largely on the Task Parallel Library). More importantly, download the actual bits (they install on top of your Visual Studio 2010), which include many samples. Get ready for a revolution in Asynchronous Programming with C# and Visual Basic. Comments about this post welcome at the original blog.

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• How to Send Custom data in ADF/XML format

  - by Kaidul Islam Sazal

  I have built a lead generator form Here which will send email in ADF/XML format.But all I found in internet about ADF that there are limited tags like contact, customer, vendors, vehicle and their corresponding sub tags.I have to send these information via ADF/XML : Your Company Name App Name Description for iTunes and Google Keywords Image or logo for icon First splash page image Second splash page image About Company work schedule List up to 10 services your company provide Company Email Company Phone Company Website Company Facebook Company Youtube Company Twitter Company Google Comments My question is that, how I can send all this data in ADF/XML ? what will be tags for these ? What will be format? I didn't find any specific answers on it in internet.

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• Print to File in Black and White (not in greyscale)

  - by user2413

  Hi all, I have these pdf files of c++code and they are colored which would be cool, except that the network printer here is b&w and the printed out codes come in various shades of pale grey which makes them essentially unreadable (specially the comments). I would like everything (text, codes, commands,...) to be printed in the same (black) color. i've tried fuddling with the printer's properties, but the closest thing i see is the 'level of grey' tab, and there i have the choice between 'enhanced' and 'normal' (and it doesn't make a difference in my case). i've tried 'print to file', but i don't see any options there to print to b&w, I've tried installing the 'generic cups printer', but again no options to print to b&w. any idea ? (i'm on 10.10)

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• Explain Python extensions multithreading

  - by Checkers

  Python interpreter has a Global Interpreter Lock, and it is my understanding that extensions must acquire it in a multi-threaded environment. But Boost.Python HOWTO page says the extension function must release the GIL and reacquire it on exit. I want to resist temptation to guess here, so I would like to know what should be GIL locking patterns in the following scenarios: Extension is called from python (presumably running in a python thread). And extension's background thread calls back into Py_* functions. And a final question is, why the linked document says the GIL should be released and re-acquired?

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• Help Us Pick the First T-Shirt Design to Promote How-To Geek

  - by Eric Z Goodnight

  Here’s your first peek at How-To Geek’s new line of merchandise! Tell us what you think, what you like, and what you actually would like to own in this first round of potential HTG tee shirts. If you like the content here at HTG, we’d love to hear back from you—we made these for you, the readers, and we hope to hear what suits you and if you like what we’ve got to offer. Check them out, tell us your thoughts in the comments section (or send us emails at [email protected]) and fill out our poll in the section below.  The design that you like the most will be professionally printed and sold right here at howtogeek.com. Interested in buying one of them right now? Jump to the bottom to be notified when they’re ready for be bought and shipped right to you. How to Own Your Own Website (Even If You Can’t Build One) Pt 3 How to Sync Your Media Across Your Entire House with XBMC How to Own Your Own Website (Even If You Can’t Build One) Pt 2

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• Monitoring pthread context switching

  - by simon

  I would like to monitor the the context switching behavior in a multi-threaded pthread application. In other RTOSes(Micro C OS) I have been able to register a context switch callback for each thread in the application, and then log (or toggle a gpio) and watch the thread context switching in real time. This was a valuable tool for debugging the real time behavior and interaction of the multiple threads. My current environment is embedded linux utilizing the pthread api. Is there a way to montior each of the context switches?

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• DirectCompute Lectures

  - by Daniel Moth

  Previously I shared resources to get you started with DirectCompute, for taking advantage of GPGPUs in an a way that doesn't tie you to a hardware vendor (e.g. nvidia, amd). I just stumbled upon and had to share a lecture series on channel9 on DirectCompute! Here are direct links to the episodes that are up there now: DirectCompute Expert Roundtable Discussion DirectCompute Lecture Series 101- Introduction to DirectCompute DirectCompute Lecture Series 110- Memory Patterns DirectCompute Lecture Series 120- Basics of DirectCompute Application Development DirectCompute Lecture Series 210- GPU Optimizations and Performance DirectCompute Lecture Series 230- GPU Accelerated Physics DirectCompute Lecture Series 250- Integration with the Graphics Pipeline Having watched these I recommend them all, but if you only want to watch a few, I suggest #2, #3, #4 and #5. Also, you should download the "WMV (High)" so you can see the code clearly and be able to Ctrl+Shift+G for fast playback… TIP: To subscribe to channel9 GPU content, use this RSS feed. Comments about this post welcome at the original blog.

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