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  • How to Use the Avira Rescue CD to Clean Your Infected PC

    - by The Geek
    When you’ve got a PC completely infected with viruses, sometimes it’s best to reboot into a rescue disc and run a full virus scan from there. Here’s how to use the Avira Rescue CD to clean an infected PC. We’ve previously covered how to clean an infected PC using the BitDefender or Kaspersky rescue disks, and loads of readers have written in saying thanks, and reporting that they were able to clean their PC easily. Be sure and check out our previous articles on the subject: How to Use the BitDefender Rescue CD to Clean Your Infected PC How to Use the Kaspersky Rescue Disk to Clean Your Infected PC Otherwise, keep reading for how it all works with Avira, a well-respected anti-virus solution Latest Features How-To Geek ETC The Complete List of iPad Tips, Tricks, and Tutorials The 50 Best Registry Hacks that Make Windows Better The How-To Geek Holiday Gift Guide (Geeky Stuff We Like) LCD? LED? Plasma? The How-To Geek Guide to HDTV Technology The How-To Geek Guide to Learning Photoshop, Part 8: Filters Improve Digital Photography by Calibrating Your Monitor Deathwing the Destroyer – WoW Cataclysm Dragon Wallpaper Drag2Up Lets You Drag and Drop Files to the Web With Ease The Spam Police Parts 1 and 2 – Goodbye Spammers [Videos] Snow Angels Theme for Windows 7 Exploring the Jungle Ruins Wallpaper Protect Your Privacy When Browsing with Chrome and Iron Browser

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  • Save output and exit code of command to files on windows

    - by poncha
    I want to run a command and save its output and its exit code, in different files. Here's what i am doing: cmd.exe /C command 1> %TEMP%\output.log 2> %TEMP%\error.log && echo %ERRORLEVEL% > %TEMP%\status || echo %ERRORLEVEL% > %TEMP%\status If i don't do output redirection (into %TEMP%\output.log and/or %TEMP%\error.log), then exit code is saved just fine. However, when i run the line as shown above more than once (just get back to previous line in command prompt and rerun it), i get 0 in %TEMP%\status regardless of the real exit code. What am i missing? Or maybe there's a better way of doing this?

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  • single point of failure in IIS Web Farm Framework setting?

    - by aamir sajjad
    ASP.NET WEB API Windows Server 2008 R2/IIS 7.5/Web Farm Framework 2.5 I am planning to deploy application across 4 web servers. Should i use shared content/configuration using DFS among web servers for web farm scenario? Second option is to use Web Farm Framework for deployment. Furthermore, is there chance of single point of failure in WFF? for example what if primary server goes down. which option would be better? pros and cons of each of the above. I appreciate your response.

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  • Application usage report on XenApp 6

    - by Garrett
    We just deployed the latest Citrix XenApp 6 onto Server 2008 R2, and we'd like to run an application usage report. I've googled around, but all the how-to's seem to be aimed at XenApp 5 and lower, when apparently it was much easier. I came across this Citrix expert thread: http://forums.citrix.com/thread.jspa?threadID=265554 Which gives a powershell command, Get-XAApplicationReport, but when I run that on our Citrix Server in PS2 it says it's not recognized. Do I need to register the Citrix commands in PS some how? Is there a better way to generate the application usage report?

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  • links for 2010-03-11

    - by Bob Rhubart
    Andy Mulholland: (Information Technology) + (Business Technology) ÷ Clouds = Infostructure "Internal information technology with its dedicated users, applications, licenses, client-server, data-centric and close coupled integration architecture cannot support externally oriented business technology where almost every condition is different. Internet connectivity and the emergence of people centric services in the web 2.0 world has led business and user expectations to shift dramatically and give rise to the expectation of a new and completely different working environment, based in the cloud, or more correctly, clouds." -- Andy Mulholland, CTO Blog, Capgemini (tags: enterprisearchitecture cloud web2.0 entarch) @myfear: Getting started with (GSW #2): GlassFish v3 "If the application server/container of your choice is a Java EE compliant one, you are on the right track. This list is not too long these days, if you look for Java EE 6 compliant servers. The most prominent and well-known is also the Java EE 6 reference implementation (RI): The Oracle GlassFish v3." -- Oracle ACE Markus "@myfear" Eisele (tags: oracle otn oracleace glassfish java) @oraclenerd: The"Database is a Bucket" Mentality "Could it be that everyone out there believes that the sole purpose of a database is to store data? That it can't do anything else?" -- Chet "@oraclenerd" Justice (tags: otn oracle database dba) The Encyclopedia of SOA "SOA is an anagram for OSA, which means female bear in spanish. It is a well-known fact in the spanish-speaking world that female bears are able to model business processes and optimize reusable IT assets better than any other hibernating animal." -- One of the surprisingly funny nuggets of wisdom available in the Encyclopedia of SOA. (tags: architecture chucknorris humor soa software technology webservices) Marina Fisher: Book Review - Web 2.0 Fundamentals Marina Fisher reviews WEB 2.0 FUNDAMENTALS by Oswald Campesato and Kevin Nilson. (tags: sun web2.0 bookreview socialnetworking)

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  • Screen shots and documentation on the cheap

    - by Kyle Burns
    Occasionally I am surprised to open up my toolbox and find a great tool that I've had for years and never noticed.  The other day I had just such an experience with Windows Server 2008.  A co-worker of mine was squinting to read to screenshots that he had taken using the "Print Screen, paste" method in WordPad and asked me if there was a better tool available at a reasonable cost.  My first instinct was to take a look at CamStudio for him, but I also knew that he had an immediate need to take some more screenshots, so I decided to check and see if the Snipping Tool found in Windows 7 is also available in Windows Server 2008.  I clicked the Start button and typed “snip” into the search bar and while the Snipping Tool did not come up, a Control Panel item labeled “Record steps to reproduce a problem” did. The application behind the Control Panel entry was “Problem Steps Recorder” (PSR.exe) and I have confirmed that it is available in Windows 7 and Windows Server 2008 R2 but have not checked other platforms.  It presents a pretty minimal and intuitive interface in providing a “Start Record”, “Stop Record”, and “Add Comment” button.  The “Start Record” button shockingly starts recording and, sure enough, the “Stop Record” button stops recording.  The “Add Comment” button prompts for a comment and for you to highlight the area of the screen to which your comment is related.  Once you’re done recording, the tool outputs an MHT file packaged in a ZIP archive.  This file contains a series of screen shots depicting the user’s interactions and giving timestamps and descriptive text (such as “User left click on “Test” in “My Page – Windows Internet Explorer”) as well as the comments they made along the way and some diagnostics about the applications captured. The Problem Steps Recorder looks like a simple solution to the most common of my needs for documentation that can turn “I can’t understand how to make it do what you’re reporting” to “Oh, I see what you’re talking about and will fix it right away”.  I you’re like me and haven’t yet discovered this tool give it a whirl and see for yourself.

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  • .NET Reflector & .NET Reflector Pro 6.1 have been released

    - by Bart Read
    .NET Reflector 6.1 and .NET Reflector Pro 6.1 have been released. You can download them from: http://www.red-gate.com/products/reflector/index.htm .NET Reflector is a class browser and disassembler for .NET assemblies. .NET Reflector Pro is a Visual Studio debugging extension that allows you to step through third party and framework assemblies, as if they were built from your own source code. This release fixes several problems that were present in the 6.0 release: Support for using a copy of Reflector.cfg stored alongside Reflector.exe has been re-enabled so users upgrading from 5.x releases will not lose their settings. Fixed unhandled exception on exit of Visual Studio when .NET Reflector add-in used in conjunction with TestDriven.NET add-in. Added better support for dealing with framework assemblies, which only contain meta-data, in the "Referenced Assemblies" folder. Fixed problem where attempted decompilation with CppCliLanguage add-in would lead to display of a page on the Red Gate website. Added option to activate .NET Reflector Pro to .NET Reflector menu in Visual Studio after receiving feedback from a number of users that it was hard to figure out how to activate the product. For more details about the products please visit: http://www.red-gate.com/products/reflector/index.htm

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  • What free Remote Desktop (server) solutions are there?

    - by Tao
    I know Ubuntu comes with a "Remote Desktop" option that appears to be a straightforward VNC server, and I'm trying to understand the alternatives. Here are the possibilities I've heard about so far: VNC VNC + SSH Tunnelling NX Server, free edition FreeNX NeatX X2Go X11 Forwarding over SSH xrdp I'm coming at this from a Windows user's perspective: To the best of my experience, RDP (aka Terminal Services) is a reasonably secure (barring mitm/server spoofing), efficient desktop sharing protocol with well-supported clients, that can be exposed to the internet when necessary without major fears of intrusion. To the best of my knowledge straight VNC is none of those things, which is where I get confused - why wouldn't a better desktop sharing technology be developed or used in the open-source world? I know VNC can be wrapped with SSH, but that seems beyond the reach of a casual user. X11 forwarding over SSH may be more or less efficient, I have no idea, but is definitely even more complicated, and doesn't (as far as I know) give you access to already-running stuff (no desktop sharing as such, just remote application running). So, I'd like any feedback/preferences amongst these or any other "Free" desktop sharing options, using these criteria and/or any others: Security (esp. for access across internet) Efficiency (bandwidth usage, responsiveness, etc) Free-ness, as in Speech (not sure where RDP or FreeNX lie for this) Free-ness, as in Beer (are there any commercial solutions with usable dependable free offerings?) Ease of use (server and client side) Cross-OS Client availability Cross-OS Server availability Support for independent sessions and shared (and/or "Console") sessions Ongoing support/maintenance/development Thanks!

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  • The Social Business Thought Leaders - John Hagel

    - by kellsey.ruppel
    While many European economies are on the brink of a recession between increasing taxation and mounting loss of jobs and bankruptcy filing rates, there's an understandable risk of losing sight of the deeper forces at play. Yet instead of surrendering to uncertainty and trying to survive in the short term, many organizations are feeling the urge to be better prepared to thrive in these complex times by developing a more articulated long term understanding of both the opportunities / challenges ahead. For example: What long-term economic, technological and societal changes are rolling out? Which foundational dynamics will affect our companies' performance, productivity, competition, and innovative potential in the upcoming decades? How will digital infrastructure change our business landscape? What kind of capabilities will be key to compete in a market shaped by growing turbulence, unpredictability and volatility? Breaking out from a strictly cyclical thinking, studies such as the Shift Index by John Hagel, Co-Chairman of the Center for the Edge at Deloitte & Touche (See Measuring the forces of long-term change - The 2009 Shift Index), depict a worrying performance challenge that affected every industry in the entire US economy over the last 45 years. Amidst a more than doubled competitive intensity of the market, and even with an improved labor productivity, the actual performance of US firms has consistently fallen to 25% of what it was in 1965. Most of this reported value is shifting from institutions and organizations to individuals, whether they are customers or young creative talent. To thrive in the digital economy and reverse declining performance trends, companies will have to fundamentally rethink their management approach by moving from knowledge stocks to knowledge flows, from scalable efficiency to scalable learning, from push organizations to pull organizations. Based on the outcomes of the Shift Index and on the book The Power of Pull, the first episode of the Social Business Thought-Leaders features John Hagel to provide strategic insights on how companies will succeed in the 21st century.

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  • Redirect folder to different server

    - by yuval
    Just for clarity, I already posted this on StackOverflow and got advice that this better fits in ServerFault.com so here goes: I know you can redirect subdomains to a different server, but can you do the same with folders? Say I have example.com. I can redirect mysubdomain.example.com to a different server, but can I redirect example.com/mysubdomain to a different server? I'd like to host a rails app in that folder on a site that runs php while still maintaining good search engines ratings (by not creating a sub domain which in my experience in recognized as a different site). Any help? Thanks!

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  • Performance Optimization &ndash; It Is Faster When You Can Measure It

    - by Alois Kraus
    Performance optimization in bigger systems is hard because the measured numbers can vary greatly depending on the measurement method of your choice. To measure execution timing of specific methods in your application you usually use Time Measurement Method Potential Pitfalls Stopwatch Most accurate method on recent processors. Internally it uses the RDTSC instruction. Since the counter is processor specific you can get greatly different values when your thread is scheduled to another core or the core goes into a power saving mode. But things do change luckily: Intel's Designer's vol3b, section 16.11.1 "16.11.1 Invariant TSC The time stamp counter in newer processors may support an enhancement, referred to as invariant TSC. Processor's support for invariant TSC is indicated by CPUID.80000007H:EDX[8]. The invariant TSC will run at a constant rate in all ACPI P-, C-. and T-states. This is the architectural behavior moving forward. On processors with invariant TSC support, the OS may use the TSC for wall clock timer services (instead of ACPI or HPET timers). TSC reads are much more efficient and do not incur the overhead associated with a ring transition or access to a platform resource." DateTime.Now Good but it has only a resolution of 16ms which can be not enough if you want more accuracy.   Reporting Method Potential Pitfalls Console.WriteLine Ok if not called too often. Debug.Print Are you really measuring performance with Debug Builds? Shame on you. Trace.WriteLine Better but you need to plug in some good output listener like a trace file. But be aware that the first time you call this method it will read your app.config and deserialize your system.diagnostics section which does also take time.   In general it is a good idea to use some tracing library which does measure the timing for you and you only need to decorate some methods with tracing so you can later verify if something has changed for the better or worse. In my previous article I did compare measuring performance with quantum mechanics. This analogy does work surprising well. When you measure a quantum system there is a lower limit how accurately you can measure something. The Heisenberg uncertainty relation does tell us that you cannot measure of a quantum system the impulse and location of a particle at the same time with infinite accuracy. For programmers the two variables are execution time and memory allocations. If you try to measure the timings of all methods in your application you will need to store them somewhere. The fastest storage space besides the CPU cache is the memory. But if your timing values do consume all available memory there is no memory left for the actual application to run. On the other hand if you try to record all memory allocations of your application you will also need to store the data somewhere. This will cost you memory and execution time. These constraints are always there and regardless how good the marketing of tool vendors for performance and memory profilers are: Any measurement will disturb the system in a non predictable way. Commercial tool vendors will tell you they do calculate this overhead and subtract it from the measured values to give you the most accurate values but in reality it is not entirely true. After falling into the trap to trust the profiler timings several times I have got into the habit to Measure with a profiler to get an idea where potential bottlenecks are. Measure again with tracing only the specific methods to check if this method is really worth optimizing. Optimize it Measure again. Be surprised that your optimization has made things worse. Think harder Implement something that really works. Measure again Finished! - Or look for the next bottleneck. Recently I have looked into issues with serialization performance. For serialization DataContractSerializer was used and I was not sure if XML is really the most optimal wire format. After looking around I have found protobuf-net which uses Googles Protocol Buffer format which is a compact binary serialization format. What is good for Google should be good for us. A small sample app to check out performance was a matter of minutes: using ProtoBuf; using System; using System.Diagnostics; using System.IO; using System.Reflection; using System.Runtime.Serialization; [DataContract, Serializable] class Data { [DataMember(Order=1)] public int IntValue { get; set; } [DataMember(Order = 2)] public string StringValue { get; set; } [DataMember(Order = 3)] public bool IsActivated { get; set; } [DataMember(Order = 4)] public BindingFlags Flags { get; set; } } class Program { static MemoryStream _Stream = new MemoryStream(); static MemoryStream Stream { get { _Stream.Position = 0; _Stream.SetLength(0); return _Stream; } } static void Main(string[] args) { DataContractSerializer ser = new DataContractSerializer(typeof(Data)); Data data = new Data { IntValue = 100, IsActivated = true, StringValue = "Hi this is a small string value to check if serialization does work as expected" }; var sw = Stopwatch.StartNew(); int Runs = 1000 * 1000; for (int i = 0; i < Runs; i++) { //ser.WriteObject(Stream, data); Serializer.Serialize<Data>(Stream, data); } sw.Stop(); Console.WriteLine("Did take {0:N0}ms for {1:N0} objects", sw.Elapsed.TotalMilliseconds, Runs); Console.ReadLine(); } } The results are indeed promising: Serializer Time in ms N objects protobuf-net   807 1000000 DataContract 4402 1000000 Nearly a factor 5 faster and a much more compact wire format. Lets use it! After switching over to protbuf-net the transfered wire data has dropped by a factor two (good) and the performance has worsened by nearly a factor two. How is that possible? We have measured it? Protobuf-net is much faster! As it turns out protobuf-net is faster but it has a cost: For the first time a type is de/serialized it does use some very smart code-gen which does not come for free. Lets try to measure this one by setting of our performance test app the Runs value not to one million but to 1. Serializer Time in ms N objects protobuf-net 85 1 DataContract 24 1 The code-gen overhead is significant and can take up to 200ms for more complex types. The break even point where the code-gen cost is amortized by its faster serialization performance is (assuming small objects) somewhere between 20.000-40.000 serialized objects. As it turned out my specific scenario involved about 100 types and 1000 serializations in total. That explains why the good old DataContractSerializer is not so easy to take out of business. The final approach I ended up was to reduce the number of types and to serialize primitive types via BinaryWriter directly which turned out to be a pretty good alternative. It sounded good until I measured again and found that my optimizations so far do not help much. After looking more deeper at the profiling data I did found that one of the 1000 calls did take 50% of the time. So how do I find out which call it was? Normal profilers do fail short at this discipline. A (totally undeserved) relatively unknown profiler is SpeedTrace which does unlike normal profilers create traces of your applications by instrumenting your IL code at runtime. This way you can look at the full call stack of the one slow serializer call to find out if this stack was something special. Unfortunately the call stack showed nothing special. But luckily I have my own tracing as well and I could see that the slow serializer call did happen during the serialization of a bool value. When you encounter after much analysis something unreasonable you cannot explain it then the chances are good that your thread was suspended by the garbage collector. If there is a problem with excessive GCs remains to be investigated but so far the serialization performance seems to be mostly ok.  When you do profile a complex system with many interconnected processes you can never be sure that the timings you just did measure are accurate at all. Some process might be hitting the disc slowing things down for all other processes for some seconds as well. There is a big difference between warm and cold startup. If you restart all processes you can basically forget the first run because of the OS disc cache, JIT and GCs make the measured timings very flexible. When you are in need of a random number generator you should measure cold startup times of a sufficiently complex system. After the first run you can try again getting different and much lower numbers. Now try again at least two times to get some feeling how stable the numbers are. Oh and try to do the same thing the next day. It might be that the bottleneck you found yesterday is gone today. Thanks to GC and other random stuff it can become pretty hard to find stuff worth optimizing if no big bottlenecks except bloatloads of code are left anymore. When I have found a spot worth optimizing I do make the code changes and do measure again to check if something has changed. If it has got slower and I am certain that my change should have made it faster I can blame the GC again. The thing is that if you optimize stuff and you allocate less objects the GC times will shift to some other location. If you are unlucky it will make your faster working code slower because you see now GCs at times where none were before. This is where the stuff does get really tricky. A safe escape hatch is to create a repro of the slow code in an isolated application so you can change things fast in a reliable manner. Then the normal profilers do also start working again. As Vance Morrison does point out it is much more complex to profile a system against the wall clock compared to optimize for CPU time. The reason is that for wall clock time analysis you need to understand how your system does work and which threads (if you have not one but perhaps 20) are causing a visible delay to the end user and which threads can wait a long time without affecting the user experience at all. Next time: Commercial profiler shootout.

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  • CentOS vs. Ubuntu

    - by DLH
    I had a web server that ran Ubuntu, but the hard drive failed recently and everything was erased. I decided to try CentOS on the machine instead of Ubuntu, since it's based on Red Hat. That association meant a lot to me because Red Hat is a commercial server product and is officially supported by my server's manufacturer. However, after a few days I'm starting to miss Ubuntu. I have trouble finding some of the packages I want in the CentOS repositories, and the third-party packages I've tried have been a hassle to deal with. My question is, what are the advantages of using CentOS as a server over Ubuntu? CentOS is ostensibly designed for this purpose, but so far I would prefer to use a desktop edition of Ubuntu over CentOS. Are there any killer features of CentOS which make it a better server OS? Is there any reason I shouldn't switch back to Ubuntu Server or Xubuntu?

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  • More Retro Games

    - by Matt Christian
    Last week I made 2 stops to my local game stores and spent a load of cash on a bunch of new retro games for my collection.  Here are the recent additions: NES - Mega Man 2 - The Adventures of Bayou Billy - Ducktales - Metal Gear - Super Mario Bros / Duck Hunt - Firestorm - Dragon's Lair - Bartman Meets Radioactive Man N64 - Superman 64 - Zelda: Ocarina of Time (in original box, box is in poor condition) Atari - Superman - Adventure - Donkey Kong - Raiders of the Lost Ark Dreamcast - Memory card with view screen - Space Channel 5 Genesis (all in case) - Jurassic Park - Sonic Spinball - Sonic the Hegehog 3 (missing manual) - Spiderman (also called Spiderman vs. The Kingpin) GameGear - Bart vs The Space Mutants Quite a large haul given it was all purchased in 2 days.  Although, Metal Gear I got for a great deal and almost considered buying their other copy simply to resale for more though I decided against it to let another lucky soul find it.  I may need to run over there again because I think they had TMNT 2 (NES) for around $6 and it usually sells for more than that.  I could have sworn I grabbed it and bought it but my receipt tells me differently. I also found my copy of Super Mario 3 and added that to my collection.  Unfortunately one of the corners of the label has begun to peel up pretty badly which sucks although it's still a good item for the collection. In other retro news, this weekend was Easter and while at my grandparents the cousins wanted to play on their NES which was not working.  Me being the retro NES nerd I am, grabbed a screw driver, some Windex, a few toothpicks, and a few cotton swabs and had it up and running under an hour (that includes eating dinner!).  The NES holds the games tighter, has a better connection, and works almost instantly.  I should do THAT for a living!

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  • Dvorak hotkey remapping in vim, worth it?

    - by Bryan Ward
    I've been trying to learn the dvorak keyboard layout of late and I have been making some good progress this time around. The trouble I am finding now is that all of my hotkeys are all in the wrong places. As a vim user this is particularly troubling. I have found good resources to switch the bindings back so that they are in the places in vim, but I wonder if this is worth it. I also use set -o vi in my ~/.zshrc file so that I can use the familiar bindings in the terminal as well. hjkl navigation is also featured in a number of other applications such as less. For those of you out there who have successfully made the switch, is it worth remapping things to be familiar again, or is it better in the long run to just deal with weirdly placed hotkeys?

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  • Apache mpm-itk Performance

    - by Matt Beckman
    I manage a bunch of VPSs with memory ranging from 1GB to 8GB. Most of these websites are Joomla websites, and the servers must support multiple sites/users/S-FTP. I use mpm-itk almost exclusively (mostly due to it's convenience in these shared environments). However, I'm aware it isn't known for performance, so I need some advice on making it faster. Due to the lack of documentation when I first went the way of mpm-itk, I included only one setting in the config, and that was to limit each user to 50 clients (the rest I left up to defaults): <IfModule mpm_itk_module> MaxClientsVHost 50 </IfModule> Are there any better alternatives available? Are there any settings supported in mpm-prefork or mpm-worker that are also supported in mpm-itk? Thanks!

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  • Is copy paste programming bad ?

    - by ring bearer
    With plain google as well as google code search tools it is easy to find how to program using some resource or solve certain problems ( such as a Java class, or a ftp block in perl etc) and so developers are so tempted to just purely copy paste the code (in a way re-use) - is this an incompetency? I have done this myself though I think I am a better programmer than many others I have seen. Who has the time to RTFM? In this age of information abundance, I do not think that copy paste programming is bad. Isn't that what sites like stackoverflow do anyway? People ask - ok here is my problem - how to solve it? now someone will post complete code and the person who asked the question would simply copy paste the most voted answer. No matter how small the problem is. I am working with a bunch of young coders who heavily rely on internet to get their job done. I see convenience (for example, you may be quite good with algorithms and such but you may not know how to use a BufferedReader in Java - would you read complete Javadoc for BufferedReader or look up some example of using it somewhere??) in copy pasting and modifying code to get the job done. What are the real dangers of copy paste coding that can impact their competency?

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  • Quick way to convert Excel sheet to XML

    - by nute
    How do you easily convert an excel file into a XML file? When trying to save as an XML File, it complains that the file does not have an XML mapping. Clicking help brings up pretty complicated stuff about XML Mapping file, XLD and some other acronyms. Why is it so complicated? Lately I've realized that tab delimited, CSV and others are prone to formating issues (comas in a field, new lines, quotes, ...). So I think that XML is a better way to process excel data. Please advise. Maybe a freeway tool?

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  • How to make MAMP PRO / XAMPP secure enough to serve as production webserver? Is it possible?

    - by Andrei
    Hi, my task is to setup a MAMP webserver for our website in the easiest way so it can be managed by my colleagues without experience in server administration. MAMP PRO is an excellent solution, but some guys don't suggest to use it for serving external requests. Could you explain why it is bad (in details if possible) and how to make it secure enough to be a full-scale and not-only-local webserver? Is there a better solution? Update There is a discussion on the MAMP website. XAMPP developers say that one can make their product secure: The default configuration is not good from a securtiy point of view and it's not secure enough for a production environment - please don't use XAMPP in such environment. Since LAMPP 0.9.5 you can make your XAMPP installation secure by calling »/opt/lampp/lampp security«. Could you comment it?

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  • The fastest way to resize images from ASP.NET. And it’s (more) supported-ish.

    - by Bertrand Le Roy
    I’ve shown before how to resize images using GDI, which is fairly common but is explicitly unsupported because we know of very real problems that this can cause. Still, many sites still use that method because those problems are fairly rare, and because most people assume it’s the only way to get the job done. Plus, it works in medium trust. More recently, I’ve shown how you can use WPF APIs to do the same thing and get JPEG thumbnails, only 2.5 times faster than GDI (even now that GDI really ultimately uses WIC to read and write images). The boost in performance is great, but it comes at a cost, that you may or may not care about: it won’t work in medium trust. It’s also just as unsupported as the GDI option. What I want to show today is how to use the Windows Imaging Components from ASP.NET APIs directly, without going through WPF. The approach has the great advantage that it’s been tested and proven to scale very well. The WIC team tells me you should be able to call support and get answers if you hit problems. Caveats exist though. First, this is using interop, so until a signed wrapper sits in the GAC, it will require full trust. Second, the APIs have a very strong smell of native code and are definitely not .NET-friendly. And finally, the most serious problem is that older versions of Windows don’t offer MTA support for image decoding. MTA support is only available on Windows 7, Vista and Windows Server 2008. But on 2003 and XP, you’ll only get STA support. that means that the thread safety that we so badly need for server applications is not guaranteed on those operating systems. To make it work, you’d have to spin specialized threads yourself and manage the lifetime of your objects, which is outside the scope of this article. We’ll assume that we’re fine with al this and that we’re running on 7 or 2008 under full trust. Be warned that the code that follows is not simple or very readable. This is definitely not the easiest way to resize an image in .NET. Wrapping native APIs such as WIC in a managed wrapper is never easy, but fortunately we won’t have to: the WIC team already did it for us and released the results under MS-PL. The InteropServices folder, which contains the wrappers we need, is in the WicCop project but I’ve also included it in the sample that you can download from the link at the end of the article. In order to produce a thumbnail, we first have to obtain a decoding frame object that WIC can use. Like with WPF, that object will contain the command to decode a frame from the source image but won’t do the actual decoding until necessary. Getting the frame is done by reading the image bytes through a special WIC stream that you can obtain from a factory object that we’re going to reuse for lots of other tasks: var photo = File.ReadAllBytes(photoPath); var factory = (IWICComponentFactory)new WICImagingFactory(); var inputStream = factory.CreateStream(); inputStream.InitializeFromMemory(photo, (uint)photo.Length); var decoder = factory.CreateDecoderFromStream( inputStream, null, WICDecodeOptions.WICDecodeMetadataCacheOnLoad); var frame = decoder.GetFrame(0); We can read the dimensions of the frame using the following (somewhat ugly) code: uint width, height; frame.GetSize(out width, out height); This enables us to compute the dimensions of the thumbnail, as I’ve shown in previous articles. We now need to prepare the output stream for the thumbnail. WIC requires a special kind of stream, IStream (not implemented by System.IO.Stream) and doesn’t directlyunderstand .NET streams. It does provide a number of implementations but not exactly what we need here. We need to output to memory because we’ll want to persist the same bytes to the response stream and to a local file for caching. The memory-bound version of IStream requires a fixed-length buffer but we won’t know the length of the buffer before we resize. To solve that problem, I’ve built a derived class from MemoryStream that also implements IStream. The implementation is not very complicated, it just delegates the IStream methods to the base class, but it involves some native pointer manipulation. Once we have a stream, we need to build the encoder for the output format, which could be anything that WIC supports. For web thumbnails, our only reasonable options are PNG and JPEG. I explored PNG because it’s a lossless format, and because WIC does support PNG compression. That compression is not very efficient though and JPEG offers good quality with much smaller file sizes. On the web, it matters. I found the best PNG compression option (adaptive) to give files that are about twice as big as 100%-quality JPEG (an absurd setting), 4.5 times bigger than 95%-quality JPEG and 7 times larger than 85%-quality JPEG, which is more than acceptable quality. As a consequence, we’ll use JPEG. The JPEG encoder can be prepared as follows: var encoder = factory.CreateEncoder( Consts.GUID_ContainerFormatJpeg, null); encoder.Initialize(outputStream, WICBitmapEncoderCacheOption.WICBitmapEncoderNoCache); The next operation is to create the output frame: IWICBitmapFrameEncode outputFrame; var arg = new IPropertyBag2[1]; encoder.CreateNewFrame(out outputFrame, arg); Notice that we are passing in a property bag. This is where we’re going to specify our only parameter for encoding, the JPEG quality setting: var propBag = arg[0]; var propertyBagOption = new PROPBAG2[1]; propertyBagOption[0].pstrName = "ImageQuality"; propBag.Write(1, propertyBagOption, new object[] { 0.85F }); outputFrame.Initialize(propBag); We can then set the resolution for the thumbnail to be 96, something we weren’t able to do with WPF and had to hack around: outputFrame.SetResolution(96, 96); Next, we set the size of the output frame and create a scaler from the input frame and the computed dimensions of the target thumbnail: outputFrame.SetSize(thumbWidth, thumbHeight); var scaler = factory.CreateBitmapScaler(); scaler.Initialize(frame, thumbWidth, thumbHeight, WICBitmapInterpolationMode.WICBitmapInterpolationModeFant); The scaler is using the Fant method, which I think is the best looking one even if it seems a little softer than cubic (zoomed here to better show the defects): Cubic Fant Linear Nearest neighbor We can write the source image to the output frame through the scaler: outputFrame.WriteSource(scaler, new WICRect { X = 0, Y = 0, Width = (int)thumbWidth, Height = (int)thumbHeight }); And finally we commit the pipeline that we built and get the byte array for the thumbnail out of our memory stream: outputFrame.Commit(); encoder.Commit(); var outputArray = outputStream.ToArray(); outputStream.Close(); That byte array can then be sent to the output stream and to the cache file. Once we’ve gone through this exercise, it’s only natural to wonder whether it was worth the trouble. I ran this method, as well as GDI and WPF resizing over thirty twelve megapixel images for JPEG qualities between 70% and 100% and measured the file size and time to resize. Here are the results: Size of resized images   Time to resize thirty 12 megapixel images Not much to see on the size graph: sizes from WPF and WIC are equivalent, which is hardly surprising as WPF calls into WIC. There is just an anomaly for 75% for WPF that I noted in my previous article and that disappears when using WIC directly. But overall, using WPF or WIC over GDI represents a slight win in file size. The time to resize is more interesting. WPF and WIC get similar times although WIC seems to always be a little faster. Not surprising considering WPF is using WIC. The margin of error on this results is probably fairly close to the time difference. As we already knew, the time to resize does not depend on the quality level, only the size does. This means that the only decision you have to make here is size versus visual quality. This third approach to server-side image resizing on ASP.NET seems to converge on the fastest possible one. We have marginally better performance than WPF, but with some additional peace of mind that this approach is sanctioned for server-side usage by the Windows Imaging team. It still doesn’t work in medium trust. That is a problem and shows the way for future server-friendly managed wrappers around WIC. The sample code for this article can be downloaded from: http://weblogs.asp.net/blogs/bleroy/Samples/WicResize.zip The benchmark code can be found here (you’ll need to add your own images to the Images directory and then add those to the project, with content and copy if newer in the properties of the files in the solution explorer): http://weblogs.asp.net/blogs/bleroy/Samples/WicWpfGdiImageResizeBenchmark.zip WIC tools can be downloaded from: http://code.msdn.microsoft.com/wictools To conclude, here are some of the resized thumbnails at 85% fant:

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  • How can I use Windows Workflow for validation of a Silverlight application?

    - by Josh C.
    I want to use Windows Workflow to provide a validation service. The validation that will be provided may have multiple tiers with chaining and redirecting to other stages of validation. The application that will generate the data for validation is a Silverlight app. I imagine the validation will take longer than the blink of an eye, so I don't want to tie the user up. Instead, I would like the user to submit the current data for validation. If the validation happens quickly, the service will perform an asynchronous callback to the app. The viewmodel that made the call would receive the validation output and post into the view. If the validation takes a long time, the user can move forward in the Silverlight app, disregarding the potential output of the validation. The viewmodel that made the call would be gone. I expect there would be another viewmodel that would contain the current validation output in its model. The validation value would change causing the user to get a notification in smaller notifcation area. I can see how the current view's viewmodel would call the validation through the viewmodel that is containing the validation output, but I am concerned that the service call will timeout. Also, I think the user may have already changed the values from the original validation, invalidating the feedback. I am sure asynchronous validation is a problem solved many times over, I am looking to glean from your experience in solving this kind of problem. Is this the right approach to the problem, or is there a better way to approach this?

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  • Intel P6100 CPU and Mobile Intel® HM55 Express Chipset

    - by Christopher Painter
    I have an Asus K52F-BBR5 notebook that uses an Intel P6100 ( 2GHZ 15x multiplier) and HM55 Express Chipset. I'm looking to replace it's 3GB with 8GB. The Crucial database seems to indicate that a PC3-8500 CAS 7 and PC3-10666 CAS 9 will both work. I'm not up to date on the latest DDR3 nomencalature and I'm wondering which would provide better performance. The price difference is negligible. Drawing on past experiences from many many years ago I could make an argument for either based on sync/async bus speed arguments and CAS latency differences but the truth is I don't know enough about the HM55 chipset to know which would be the correct choice. Does anyone know the answer or point me to information that would help me make the choice? I'm pretty sure the performance difference will be somewhat negligible also but still I'd like to make the optimal choice.

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  • A standard style guide or best-practice guide for web application development

    - by gutch
    I run a very small team of developers on a web application, just three people (and not even full time). We're all capable developers, but we write our code in very different ways: we name similar things in different ways, we use different HTML and CSS to achieve similar outcomes. We can manage this OK because we're small, but can't help feeling it would be better to get some standards in place. Are there any good style guides or best-practice guides for web application development that we can use to keep our code under control? Sure, we could write them ourselves. But the reality is that with lots to do and very few staff, we're not going to bother. We need something off the shelf that we can tinker with rather than start from scratch. What we're not looking for here is basic code formatting rules like "whether to use tabs or spaces" or "where to put line breaks" — we can control this by standardising our IDEs. What we are looking for are rules for code and markup. For example: What HTML markup should be used for headers, tables, sidebars, buttons, etc. When to add new CSS styles, and what to name them When IDs should be allocated to HTML elements, and what to name them How Javascript functions should be declared and called How to pick an appropriate URL for given page or AJAX call When to use each HTTP method, ie POST vs GET vs PUT etc How to name server-side methods (Java, in our case) How to throw and handle errors and exceptions in a consistent way etc, etc.

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  • IP addresses for Windows Azure servers seem to be from the US, when the servers are supposed to be located in Europe

    - by paradroid
    I have a couple of test servers on Windows Azure. One is in the North Europe location and the other is in West Europe. I yet to get around to testing which location offers better connection speeds from where I am (London, UK). The Northern Europe Azure datacentre is apparently in Ireland and the West Europe datacentre is in the Netherlands, which is weird in itself I think. But what I am confused about are the IP addresses are both 168.63.xxx.xxx. GeoIP lookup says that they are both located in the US, and traceroute from London to the addresses get to the US before failing to respond pings. What's going on?

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  • How to structure a XML-based order form using ASP.NET

    - by Brendan
    First question here; please help me if I'm doing something wrong. I'm a graphic designer who's trying to teach himself ASP.NET/C#. My server-side background is PHP/WordPress and some ASP Classic, and when I do code I've hand-coded just about everything since I started learning HTML. So, as I've started to learn .NET, my code has been very manual and procedural. I'm now trying to create a really basic order form that pulls from an XML file to populate the form; there's an image, a title, a price, and selectable quantities. If I was making this form as a static HTML file, I'd have each field named manually and so on postback I could query each field to get the values. But I'm trying to do this dynamically so that I can add/remove items from the form and not have to change the code. In terms of displaying the XML, I rolled my own by loading XmlDocument and using XmlNodeList and a bunch of foreach loops to get things displayed. Then, I learned about <asp:XmlDataSource> and <asp:Repeater>, which made displaying the XML simpler by a large margin. However, I've had a really hard time getting the data that's been submitted on postback (it was implied on SO that there are better ways to get data than nested RepeaterItems). So, what I've learned so far is that you can do things a bunch of different ways in .NET. that's why I thought it'd be good to ask for answers regarding the best way to use ASP.NET to display a XML document and dynamically capture the data that's submitted. Any help is appreciated! I'm using Notepad++ to code .NET 2.0.

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  • Does HTML 5 &ldquo;Rich vs. Reach&rdquo; a False Choice?

    - by andrewbrust
    The competition between the Web and proprietary rich platforms, including Windows, Mac OS, iPhone/iPad, Adobe’s Flash/AIR and Microsoft’s Silverlight, is not new. But with the emergence of HTML 5 and imminent support for it in the next release of the major Web browsers, the battle is heating up. And with the announcements made Wednesday at Google's I/O conference, it's getting kicked up yet another notch. The impact of this platform battle on companies in the media and advertising world, and the developers who serve them, is significant. The most prominent question is whether video and rich media online will shift towards pure HTML and away from plug-ins like Flash and Silverlight. In fact, certain features in HTML 5 make it suitable for development for line of business applications as well, further threatening those plug-in technologies. So what's the deal? Is this real or hype? To answer that question, I've done my own research into HTML 5's features and talked to several media-focused, New York area developers to get their opinions. I present my findings to you in this post. Before bearing down into HTML 5 specifics and practitioners’ quotes, let's set the context. To understand what HTML 5 can do, take a look at this video of Sports Illustrated’s HTML 5 prototype. This should start to get you bought into the idea that HTML 5 could be a game-changer. Next, if you happen to have installed the beta version of Google's Chrome 5 browser, take a look at the page linked to below, and in that page, click on any of the game thumbnails to see what's possible, without a plug-in, in this brave new world. (Note, although the instructions for each game tell you to press the A key to start, press the Z key instead.). Here's the link: http://www.kesiev.com/akihabara As an adjunct to what's enabled by HTML 5, consider the various transforms that are part of CSS 3. If you're running Safari as your browser, the following link will showcase this live; if not, you'll see a bitmap that will give you an idea of what's possible: http://webkit.org/blog/386/3d-transforms Are you starting to get the picture (literally)? What has up until now required browser plug-ins and other patches to HTML, most typically Flash, will soon be renderable, natively, in all major browsers. Moreover, it's looking likely that developers will be able to deliver such content and experiences in these browsers using one base of markup and script code (using straight JavaScript and/or jQuery), without resorting to browser-specific code and workarounds. If you're skeptical of this, I wouldn't blame you, especially with respect to Microsoft's Internet Explorer. However, i can tell you with confidence that even Microsoft is dedicated to full-on HTML 5 support in version 9 of that browser, which is currently under development. So what’s new in HTML 5, specifically, that makes sites like this possible?  The specification documents go into deep detail, and there’s no sense in rehashing them here, but a summary is probably in order.   Here is a non-authoritative, but useful, list of the major new feature areas in HTML 5: 2D drawing capabilities and 3D transforms. 2D drawing instructions can be embedded statically into a Web page; application interactivity and animation can be achieved through script.  As mentioned above, 3D transforms are technically part of version 3 of the CSS (Cascading Style Sheets) spec, rather than HTML 5, but they can nonetheless be thought of as part of the bundle.  They allow for rendering of 3D images and animations that, together with 2D drawing, make HTML-based games much more feasible than they are presently, as the links above demonstrate. Embedded audio and video. A media player can appear directly in a rendered Web page, using HTML markup and no plug-ins. Alternately, player controls can be hidden and the content can play automatically. Major enhancements to form-based input. This includes such things as specification of required fields, embedding of text “hints” into a control, limiting valid input on a field to dates, email addresses or a list of values.  There’s more to this, but the gist is that line-of-business applications, with complicated input and data validation, are supported directly Offline caching, local storage and client-side SQL database. These facilities allow Web applications to function more like native apps, even if no internet connection is available. User-defined data. Data (or metadata – data about data) can easily be embedded statically and/or retrieved and updated with Javascript code. This avoids having to embed that data in a separate file, or within script code. Taken together, these features position HTML to compete with, and perhaps overtake, Adobe’s Flash/AIR (and Microsoft’s Silverlight) as a viable Web platform for media, RIAs (rich internet applications – apps that function more like desktop software than Web sites) and interactive Web content, including games. What do players in the media world think about this?  From the embedded video above, we know what Sports Illustrated (and, therefore, Time Warner) think.  Hulu, the major Internet site for broadcast TV content, is on record as saying HTML5 video does not pass muster with them, at least not yet.  YouTube, on the other hand, already has an experimental HTML 5-based version of their site.  TechCrunch has reported that NetFlix is flirting with HTML 5 too, especially as it pertains to embedded browsers in TV-based devices.  And the New York Times’ Web site now embeds some video clips without resorting to Flash.  They have to – otherwise iPhone, iPod Touch and iPad users couldn’t see them in the Mobile Safari browser. What do media-focused developers think about all this?  I talked to several to get their opinions. Michael Pinto is CEO and Founder of Very Memorable Design whose primary focus has been to help marketing directors get traction online.  The firm’s client roster includes the likes Time, Inc., Scholastic and PBS.  Pinto predicts that “More and more microsites that were done entirely in Flash will be done more and more using jQuery. I can also see slideshows and video now being done without Flash. However if you needed to create a game or highly interactive activity Flash would still be the way to go for the web.” A dissenting view comes from Jesse Erlbaum, CEO of The Erlbaum Group, LLC, which serves numerous clients in the magazine publishing sector.  When I asked Erlbaum whether he thought HTML 5 and jQuery/JavaScript would steal significant market share from Flash, he responded “Not at all!  In particular, not for media and advertising customers!  These sectors are not generally in the business of making highly functional applications, which is the one place where HTML5/jQuery/etc really shines.” Ironically, Pinto’s firm is a heavy user of Flash for its projects and Erlbaum’s develops atop the “LAMP” (Linux, Apache, MySQL and PHP/Perl) stack.  For whatever reason, each firm seems to see the other’s toolset as a more viable choice.  But both agree that the developer tool story around HTML 5 is deficient.  Pinto explains “What’s lost with [HTML 5 and Javascript] techniques is that there isn’t a single widely favored easy-to-use tool of choice for authoring. So with Flash you can get up and running right away and not worry about what is different from one browser to the next.“  Erlbaum agrees, saying: “HTML5/Javascript lacks a sophisticated integrated development environment (IDE) which is an essential part of Flash.  If what someone is trying to make is primarily animation, it's a waste of time…to do this in Javascript.  It can be done much more easily in Flash, and with greater cross-browser compatibility and consistency due to the ubiquity of Flash.” Adobe (maker of Flash since its 2005 acquisition of Macromedia) likely agrees.  And for better or worse, they’ve decided to address this shortcoming of HTML 5, even at risk of diminishing their Flash platfrom. Yesterday Adobe announced that their hugely popular Deamweaver Web design authoring tool would directly support HTML 5 and CSS 3 development.  In fact, the Adobe Dreamweaver CS5 HTML5 Pack is downloadable now from Adobe Labs. Maybe Adobe is bowing to pressure from ardent Web professionals like Scott Kellum, Lead Designer at Channel V Media,  a digital and offline branding firm, serving the media and marketing sectors, among others.  Kellum told me that HTML 5 “…will definitely move people away from Flash. It has many of the same functionalities with faster load times and better accessibility. HTML5 will help Flash as well: with the new caching methods you can now even run Flash apps offline.” Although all three Web developers I interviewed would agree that Flash is still required for more sophisticated applications, Kellum seems to have put his finger on why HTML 5 may nonetheless dominate.  In his view, much of the Web development out there has little need for high-end capabilities: “Most people want to add a little punch to a navigation bar or some video and now you can get the biggest bang for your buck with HTML5, CSS3 and Javascript.” I’ve already mentioned that Google’s ongoing I/O conference, at the Moscone West center in San Francisco, is driving the HTML 5 news cycle, big time.  And Google made many announcements of their own, including the open sourcing of their VP8 video codec, new enterprise-oriented capabilities for its App Engine cloud offering, and the creation of the Chrome Web Store, which the company says will make it easier to find and “install” Web applications, in a fashion similar to  the way users procure native apps on various mobile platforms. HTML 5 looks to be disruptive, especially to the media world.  And even if the technology ends up disappointing, the chatter around it alone is causing big changes in the technology world.  If the richness it promises delivers, then magazine publishers and non-text digital advertisers may indeed have a platform for creating compelling content that loads quickly, is standards-based and will render identically in (the newest versions of) all major Web browsers.  Can this development in the digital arena save the titans of the print world?  I can’t predict, but it’s going to be fun to watch, and the competitive innovation from all players in both industries will likely be immense.

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