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Articles indexed Saturday March 13 2010

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  • Who is a web developer? What does he do

    - by Sinan
    I am wrting an article on web developers. It seems to me there are some problems on the definition of "what is a web developer". It looks like a web developer title is a bit misunderstood. And people with this title doesnt get the recognition they deserve. While most people at IT have some well defined job defitinitions. A web developer requires multiple skills. Like knowing a programming language, web security, etc. I was wondering what do you think about this issue? What skills does a web developer need? Where does his responsibilities start and end? etc.

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  • How to self-update PHP+MySQL CMS?

    - by SaltLake
    I'm writing a CMS on PHP+MySQL. I want it to be self-updatable (throw one click in admin panel). What are the best practices? How to compare current version of cms and a version of the update (application itself and database). Should it just download zip archive, upzip it and overwrite files? (but what to do with files that are no longer used). How to check if an update is downloaded correctly? Also it supports modules and I want this modules to be downloadable from the admin panel of cms. And how should I update MySQL tables?

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  • What is the most efficient algorithm for reversing a String in Java?

    - by Hultner
    I am wondering which way to reverse a string in Java that is most efficient. Should I use some sort of xor method? The easy way would be to put all the chars in a stack and put them back into a string again but I doubt that's a very efficient way to do it. And please do not tell me to use some built in function in Java. I am interested in learning how to do it not to use an efficient function but not knowing why it's efficient or how it's built up.

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  • Core Data: migrating entities with self-referential properties

    - by Dan
    My Core Data model contains an entity, Shape, that has two self-referential relationships, which means four properties. One pair is a one-to-many relationship (Shape.containedBy <- Shape.contains) and the another is a many-to-many relationship (Shape.nextShapes <<- Shape.previousShapes). It all works perfectly in the application, so I don't think self-referencing relationships is a problem in general. However, when it comes to migrating the model to a new version, then Xcode fails to compile the automatically generated mapping model, with this error message: 2009-10-30 17:10:09.387 mapc[18619:607] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'Unable to parse the format string "FUNCTION($manager ,'destinationInstancesForSourceRelationshipNamed:sourceInstances:' , 'contains' , $source.contains) == 1"' *** Call stack at first throw: ( 0 CoreFoundation 0x00007fff80d735a4 __exceptionPreprocess + 180 1 libobjc.A.dylib 0x00007fff83f0a313 objc_exception_throw + 45 2 Foundation 0x00007fff819bc8d4 _qfqp2_performParsing + 8412 3 Foundation 0x00007fff819ba79d +[NSPredicate predicateWithFormat:arguments:] + 59 4 Foundation 0x00007fff81a482ef +[NSExpression expressionWithFormat:arguments:] + 68 5 Foundation 0x00007fff81a48843 +[NSExpression expressionWithFormat:] + 155 6 XDBase 0x0000000100038e94 -[XDDevRelationshipMapping valueExpressionAsString] + 260 7 XDBase 0x000000010003ae5c -[XDMappingCompilerSupport generateCompileResultForMappingModel:] + 2828 8 XDBase 0x000000010003b135 -[XDMappingCompilerSupport compileSourcePath:options:] + 309 9 mapc 0x0000000100001a1c 0x0 + 4294973980 10 mapc 0x0000000100001794 0x0 + 4294973332 ) terminate called after throwing an instance of 'NSException' Command /Developer/usr/bin/mapc failed with exit code 6 The 'contains' is the name of one of the self-referential properties. Anyway, the really big problem is that I can't even look at this Mapping Property as Xcode crashes as soon as I select the entity mapping when viewing the mapping model. So I'm a bit lost really where to go from here. I really can't remove the self-referential properties, so I'm thinking I've got manually create a mapping model that compiles? Any ideas? Cheers

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  • Looking to learn writing a NDIS or TDI Driver

    - by Victor43
    Can anyone possibly suggest a good book which steps through the development of such a driver written in C. I'm looking for a book which is good for beginners. If there is an online resource on how to do this which explains the process from ground up it would be greatly appreciated. Thanking you Victor

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  • Eclipse RCP: Using different JUnit version (4.3.1) than shipped with eclipse galileo (4.5.0)

    - by Skrrytch
    Hallo, I have the following situation: We are developing an Eclipse RCP Application and want to switch from Eclipse 3.4 to Eclipse 3.5. Our JUnit-Tests are using JUnit 4.3.1 and we have a launch configuration to start our test suite. I think I don't need to go into more details here. The problem is: Running the tests with Eclipse 3.5 does not work: JUnit cannot find any annotations in the test classes (neither (at)Test nor (at)RunWith). I patched the junit library with some logging output to check what is going on. I found out that this problem is a classloading issue: The test class passed to JUnit 'lies in' a ClassLoader which is different from the one JUnit uses to load the annotation classes like 'RunWith'. This is not the case in Eclipse 3.4 in org.junit.internal.requests.ClassRequest: public Runner getRunner() { log("TestClass ClassLoader: "+this.fTestClass.getClassLoader()); log("RunWith.class ClassLoader: "+RunWith.class.getClassLoader()); ... // validating test class: searching for annotations and more } The first line prints another classloader than the second line. This is bad because JUnit cannot match the annotations in the test class with the Annotation-Class (here: RunWith.class): "RunWith" in CL1 is not equal to "RunWith" in CL2. I have a solution which points to the core problem: Replace JUnit 4.5 in Eclipse Galileo with JUnit 4.3.1 so that there is only one JUnit-Version: The Test-Run and the tests classes are both using JUnit 4.3.1 (I had to patch "org.eclipse.jdt.junit4.runtime" to accept an ealier junit version). I think I can also replace JUnit 4.3.1 in my test class with Version 4.5, but that is not an option yet. Guess: The classloaders are different because the classes 'come from' different JUnit-Bundles: the testclass with its annotations from version 4.3.1 and the test runs in version 4.5 What I want to know: Is there any other solution besides patching Eclipse (replace JUnit versions)? Any commandline argument or such? Any configuration to force Eclipse to Use JUnit 4.3.1? Any hints on the above described analysis are welcome!

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  • .net web service: Can't add service reference, only web reference

    - by ScottE
    I have an existing project that consumes web services. One was added as a service reference, and the other as a web reference. I don't recall why one was added as a web reference, but perhaps it's because I couldn't get it to work! The existing service reference for the one web service works fine, so it's not a .net version issue. I can successfully create a service reference for the second web service, but none of the methods are available. The .wsdl shows the schema, but the Reference.vb shows only the Namespace, and none of the methods. To clarify, these are two different 3rd party web service providers. We'd like to move to the service reference so we have more control over the configuration as we're having various issues with timeouts. Anyone come across this before? Edit Does it matter that there are two services at the address?

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  • Document -> Flash viewer, not hosted

    - by Dane
    I've got a content management solution where we present scanned images (TIFF), PDFs, word docs for viewing. While we can simply embed a PDF, sometimes depending on user preferences it's a bit fiddly and sometimes not user-intuitive. I'd like a solution like scribd, embedit, etc, but not hosted. I want to run the application on our own servers and manage it that way (for legal reasons, and our clients won't buy the service if it's hosted somewhere else). SWFtools looks a little basic for my needs, plus doesn't do doc, docx or ppt. Any options? Doesn't have to be free, but would be ideal.

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  • How to create dynamic number of output files with SSIS?

    - by JSacksteder
    I will be creating flatfiles and based on the data in the batch, it might be necessary to split the data into an undetermined number of files. I can make the connection string dynamic with an expression, but that is only evaluated when the package starts. I'd like to change that expression to include a '-a' or '-b' in the filename. Alternately, if I have to create new connection manager objects at run time on demand, how do I go about that?

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  • JScript.NET private variables

    - by Paul Podlipensky
    I'm wondering about JScript.NET private variables. Please take a look on the following code: import System; import System.Windows.Forms; import System.Drawing; var jsPDF = function(){ var state = 0; var beginPage = function(){ state = 2; out('beginPage'); } var out = function(text){ if(state == 2){ var st = 3; } MessageBox.Show(text + ' ' + state); } var addHeader = function(){ out('header'); } return { endDocument: function(){ state = 1; addHeader(); out('endDocument'); }, beginDocument: function(){ beginPage(); } } } var j = new jsPDF(); j.beginDocument(); j.endDocument(); Output: beginPage 2 header 2 endDocument 2 if I run the same script in any browser, the output is: beginPage 2 header 1 endDocument 1 Why it is so?? Thanks, Paul.

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  • Leaving my wifi open for the world

    - by Thomaschaaf
    For my home I want to be a nice neighbor actually I have let my wifi open for the past maybe 6 or 7 years. I know that WEP, etc can be cracked within a couple of minutes but my neighbors son who works in IT told his mom and she told me that I am doing bad things and you know the story.. Do you think it's okay to leave your wifi open to the public? I live in a suburb with a tiny street and about 8 houses in reach of my wifi. I have a 16k DSL line so if some one joins me for a couple hours I would probably not notice. I would love your thoughts on whether I should encrypt my wifi or not.

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  • xcopy and timeouts

    - by acidzombie24
    Related to this question and this answer http://serverfault.com/questions/48839/backup-on-disc-using-truecrypt-corruption-problem/50829#50829 I want to copy the backup to my HD. However the timeout seems to be a problem. I see many single files then i see File creation error - Data error (cyclic redundancy check). and its currently trying to copy the next file. When i click my computer i see nothing and it also locks up for some seconds (30 maybe) So TrueCrypt is not a good solution if i must be able to copy files back from a volume with a corrupted sector? (answer in other thread please). Is there any way for me to change the timeout? I look here for some flags and didnt see any http://www.scriptlogic.com/support/CustomScripts/XCOPYCommandLineParameters.html

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  • get-eventlog issue

    - by Jim B
    I wanted to get a quick report of some log entries I saw on a server, so I ran: Get-Eventlog -logname system -newest 10 -computer fs1 | fl I got events back however the descriptions were all wrong. Here's an example: Index : 1260055 EntryType : Warning InstanceId : 2186936367 Message : The description for Event ID '-2108030929' in Source 'W32Time' cannot be found. The local compute r may not have the necessary registry information or message DLL files to display the message, or you may not have permission to access them. The following information is part of the event:'time. windows.com,0x1' Category : (0) CategoryNumber : 0 ReplacementStrings : {time.windows.com,0x1} Source : W32Time TimeGenerated : 1/25/2010 10:43:31 AM TimeWritten : 1/25/2010 10:43:31 AM UserName : Note that if I pull the event ID property it's correct (in this case 38) Is this is known issue or is something wrong. The messages resolve fine via event viewer locally and remotely Here is the powershell version info: Name : ConsoleHost Version : 2.0 InstanceId : bc58fcf8-bba3-4ca8-8972-17dbd5d9ff08 UI : System.Management.Automation.Internal.Host.InternalHostUserInterface CurrentCulture : en-US CurrentUICulture : en-US PrivateData : Microsoft.PowerShell.ConsoleHost+ConsoleColorProxy IsRunspacePushed : False Runspace : System.Management.Automation.Runspaces.LocalRunspace Here is the revised version info: Name Value ---- ----- CLRVersion 2.0.50727.3603 BuildVersion 6.0.6002.18111 PSVersion 2.0 WSManStackVersion 2.0 PSCompatibleVersions {1.0, 2.0} SerializationVersion 1.1.0.1 PSRemotingProtocolVersion 2.1

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  • Bring OS X Error Message window to the front

    - by Debilski
    In OS X, when an application crashes, a window with an error report will appear. That window is by default unreachable by Command+Tab nor does it appear in the Dock. Of course, if by error or on purpose one clicks another window, the error report will go to the background and hide behind the other windows. This is really annoying, because in order to see it, I will have to use Exposé and scan through 20+ Windows in order to find it. (Not to say, that I don’t like Exposé anymore since Snow Leopard made the window sizes all confusingly equal.) Any ideas on how to make the error reports Command+Tabbable?

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  • Windows 7 Printing Issue

    - by Adrian Godong
    I am using Windows 7 RTM x64. From Control Panel Devices and Printers, I have three printers listed; Fax, XPS Writer, and a Lexmark. I can print a test page through the printer properties with no problem. I can print a text file from Notepad with no problem. I can't print from Safari. When I press Ctrl+P, it displays the Print dialog, press OK and nothing happened. I can't print from Adobe Reader. When I press Ctrl+P, it complains that it there is no printer installed. I can't print from Office applications. When I press Ctrl+P, it crashes immediately. Running Office Diagnostics does not help. I can't print from IE8. When I press Ctrl+P, it displays the Print dialog, complains that I have to select a printer from the list, selected any of the three printers, the Print button is disabled. Any help? Update (01/11/2009): The default printer is the Lexmark. I'm testing on this one as well. I was about to reinstall Office (as this is the first application that has the problem), but then I tried other, some behave similarly but not identical (maybe caused by different printing implementation). On those applications that is able to display printer selection dialog, I tried the Lexmark and XPS. Neither printed anything (paper for Lexmark, file for XPS). Update (01/12/2009): It seems that my Windows installation is botched. A colleague have similar hardware/software combination (it's the same workstation model and Windows 7 x64) and his can print perfectly fine. I tried adding the printer from his share, no joy. I can test print from the printer property, I can print from Notepad, but not from any other application.

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  • JavaScript in multiple files

    - by vijay.shad
    Hi, I Have created two JavaScript files.One file is "validators.js" and other is "UserValidations.js". Here is the code for validators.js function isBlankString(value) { if (value.replace(/\s/g, "") == "") { return true; } else { return false; } } In other js file I have defined function for validating user name like this. function validateUsername(element) { var username = element.value; if(value.replace(/\s/g, "") == ""){ //nothing to validate return; }else{ //validation logic } } Now as it is obvious i should have used isBlankString(value) method to check string length. But I am clue less about how can i use the function defined in other file?

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  • PHP and Classes: access to parent's public property within the parent class

    - by takpar
    Hi, here is what my code looks like i have two forms: class Form_1 extends Form_Abstract { public $iId = 1; } class Form_2 extends Form_1 { public $iId = 2; } i expect the code behave like this: $oForm = new Form_2; echo $oForm->getId(); // it returns '2' echo $oForm->getParentId(); // i expect it returns '1' here is my Form_Abstract class: class Form_Abstract { public $iId = 0; public function getId() { return $this->iId; } /** this method will be called from a child instance */ public function getParentId() { return parent::$iId; } } but it throws a Fatal Error: Fatal error: Cannot access parent:: when current class scope has no parent please help me with the method getParentId()

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  • Use Margin Auto and Center to center Float Left Div

    - by Yan Cheng CHEOK
    I know this question had been asked many times. http://stackoverflow.com/questions/1740587/float-a-div-to-center However, I follow their suggestion : <center> <div style="margin : auto"> <a href="#" style="float: left; margin-right: 10px;">Menu Item 1</a> <a href="#" style="float: left; margin-right: 10px;">Menu Item 2</a> <a href="#" style="float: left; margin-right: 10px;">Menu Item 3</a> </div> </center> By using "Center" and "Margin Auto", I still unable to center the menu item.

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  • jQuery UI: How to change the color of a ProgressBar?

    - by IronGoofy
    I've set up a simple jQueryUI progressbar: <script type="text/javascript"> $(function() { $("#progressbar").progressbar({ value: 35 }); }); </script> <div id="progressbar"> </div> Now, I'd like to color the of the bar based on it's value (e.g. <10 red, <50 yellow, 50 green). How do I do this? Note: There are similar questions, but the answers were not clear enough to help me get things done. Hopefully, someone can point out an easier way or provide more detailed instructions. Thanks.

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