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• Hidden features of VBA

  - by guillermooo

  Which features of the VBA language are either poorly documented, or simply not often used?

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• Will JavaScript evaluate a property's value if it's not part of an assignment statement?

  - by Bungle

  I've come across a fairly obscure problem having to do with measuring a document's height before the styling has been applied by the browser. More information here: http://sonspring.com/journal/jquery-iframe-sizing http://ajaxian.com/archives/safari-3-onload-firing-and-bad-timing In Dave Hyatt's comment from June 27, he advises simply checking the document.body.offsetLeft property to force Safari to do a reflow. Can I simply use the following statement: document.body.offsetLeft; or do I need to assign it to a variable, e.g.: var force_layout = document.body.offsetLeft; in order for browsers to calculate that value? I think this comes down to a more fundamental question - that is, without being part of an assignment statement, will JavaScript still evaluate a property's value? Does this depend on whether a particular browser's JavaScript engine optimizes the code?

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• Location of the fonts on the iPhone?

  - by Kyle

  I'm using the FreeType2 library in an iPhone project, and I'm trying to simply load a TTF file from the system, if possible. FT_Library library; FT_Face face; int error; error = FT_Init_FreeType( &library ); if ( error == 0 ) printf("Initialized FreeType2\r\n"); /* Prints */ error = FT_New_Face(library, "/System/Library/Fonts/Helvetica.ttf", 0, &face); if ( error == FT_Err_Cannot_Open_Resource ) printf("Font not found\r\n"); /* Prints */ That error seems to be for file not found. Is /System/Library/Fonts not the location of the fonts? Or, do iPhone apps simply not have any read access at all to that directory. Thanks!

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• Test wordpress sites for SQL Injection on siteurl

  - by Scott B

  I have a client who's wordpress sites have gotten hacked twice by iframe scammers. Each time they've injected iframe code into the content of the sites. This last time, today, they simply changed the siteurl in wp_options to their iframe code. The result was obvious and appeared to simply botch the paths of the scripts that rely on I can't determine if its a password compromise (on FTP or WordPress itself) or a SQL injection to alter siteurl. Since the only thing that was altered is siteurl, I'm thinking perhaps SQL Injection. What are your thoughts? Any way to scan a site for potential SQL injection vulnerabilities? The only active plugins on the site are contact form 7 and google xml sitemaps.

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• Walk/loop through an XSL key: how?

  - by krisvandenbergh

  Is there a way to walk-through a key and output all the values it contains? I though of it this way: <xsl:for-each select="key('kElement', '.')"> <li><xsl:value-of select="." /></li> </xsl:for-each> However, this does not work. I simply want to list all the values in a key for testing purposes. The question is simply: how can this be done?

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• Needing to copy properties before validation

  - by Mikael

  I have a farily complex model needing to be validated, the problem is that this model is used on two different places, one where you register your customer and one where you simply add addresses. Some fields on the address are simply not visible on the register customer form. So when i check if ModelState.IsValid i get false of course since eg. the name is not entered on the billing address, but it is on the customer. That is why i want to before validation occurs, copy a couple of fields to the model, and then validate. I am somewhat lost though and i need help. My action looks something like this: public ActionResult Register(WebCustomer customer) { customer.CopyProperties(); if(TryUpdateModel(customer)) { ... } ... But it always returns false, and ModelState.IsValid continues to be false.

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• Show a taskbar item with a NativeWindow

  - by David Brown

  My application is intended to work almost entirely through a Windows 7 taskbar item with the use of thumbnails and jump lists. I know I can easily create a Form and simply hide it, but this seems like overkill. Plus, I'd like to toy around with NativeWindow as much as possible, because I've never used it before. Essentially, I have a class called RootWindow that derives from NativeWindow. I don't need a visible window at all, but simply something to process window messages and provide a taskbar item that I can attach thumbnails and jump lists to. Is there some kind of special CreateParams option I need to pass to CreateHandle? Or am I out of luck?

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• How to serialize Java primitives using Jersey REST

  - by Olvagor

  In my application I use Jersey REST to serialize complex objects. This works quite fine. But there are a few method which simply return an int or boolean. Jersey can't handle primitive types (to my knowledge), probably because they're no annotated and Jersey has no default annotation for them. I worked around that by creating complex types like a RestBoolean or RestInteger, which simply hold an int or boolean value and have the appropriate annotations. Isn't there an easier way than writing these container objects?

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• Simplified iphone In-app store implementation for built-in product features

  - by Joey

  This question is for those familiar with implementing the iphone in-app store functionality. The app I'm building has only built-in features that are unlocked when features are purchased. Further, any modifications or additions to store items will require an app update. Also, it is only in English so has no localized languages for the items. If we take those assumptions, is it feasible to skip the step of retrieving the product info with SKProductsRequest and simply use hardcoded data within the app? While I may want to extend my app to greater complexity in the future, I'd like to know if this step to keep it simple would introduce some serious issues. One issue might be, for instance, if we have to expect a few of the items to occasionally be unavailable due to issues on Apple's side and simply trying to purchase it and letting it fail would not be a permissible or workable option in that case (especially if it is uncommon). Thanks.

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• How do I return an empty result set from a procedure using T-SQL?

  - by Kivin

  I'm interested in returning an empty result set from SQL Server stored procedures in certain events. The intended behaviour is that a L2SQL DataContext.SPName().SingleOrDefault() will result in CLR null value. I'm presently using the following solution, but I'm unsure whether it would be considered bad practice, a performance hazard (I could not find one by reading the execution plan), or if there is simply a better way: SELECT * FROM [dbo].[TableName] WHERE 0 = 1; The execution plan is a constant scan with a trivial cost associated with it. The reason I am asking this instead of simply not running any SELECTs is because I'm concerned previous SELECT @scalar or SELECT INTO statements could cause unintended result sets to be served back to L2SQL. Am I worrying over nothing?

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• Develop applications to mobiles

  - by muek

  Hi there, I have very easy question, but I simply have any idea of the answer. I have developed a small mobile-application using java, for my nokia. The problem is that when installed on my samsung the application simply crashed. Then I tried on my other nokia but different model, and I didn't got the normal behavior. So my question is, does anyone have any idea how companies that develop mobiles applications/games test their software. Does they have to have all models for all mobiles phones??

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• valid json still fails on IE with jquery's ajax or getJSON callbacks

  - by lock

  everytime my page loads, im supposed to create a datatable (also a jquery plugin) but when im fetching the contents, using .ajax or .getJSON always goes straight ahead to the error function, without even telling me what went wrong inside the callback $.ajax({ cache: false, type: "POST", url: oSettings.sAjaxSource, data: {'newdate' : date}, contentType: "application/json; charset=utf-8", dataType: "json", success: function(json) { console.log('retrieving json data'); }, error: function() { console.log("An error has occurred. Please try again."); } }); that's the actual code with the callback stripped for security purposes... this works fine in firefox which actually executes what's on the callback function but IE simply fails and proceeds to writing my log i've read alot that the primary reason the JSON calls fails for IE is whenever there are trailing commas or simply malformed JS but i used JSONLint already and verified that my json object is a valid one :(

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• Grails application hogging too much memory

  - by RN

  Tomcat 5.5.x and 6.0.x Grails 1.6.x Java 1.6.x OS CentOS 5.x (64bit) VPS Server with memory as 384M export JAVA_OPTS='-Xms128M -Xmx512M -XX:MaxPermSize=1024m' I have created a blank Grails application i.e simply by giving the command grails create-app and then WARed it I am running Tomcat on a VPS Server When I simply start the Tomcat server, with no apps deployed, the free memory is about 236M and used memory is about 156M When I deploy my "blank" application, the memory consumption spikes to 360M and finally the Tomcat instance is killed as soon as it takes up all free memory As you have seen, my app is as light as it can be. Not sure why the memory consumption is as high it is. I am actually troubleshooting a real application, but have narrowed down to this scenario which is easier to share and explain.

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• What considerations should be made for a web app to be released on a cloud hosted system?

  - by Rhubarb

  I have a web app that is primarily a WordPress app, but it pulls content from a Django app, simply by calling a service that uses Django models. My understanding of cloud computing is a bit vague. If the site needs to scale up with short notice, does the cloud provider (Amazon, Rackspace, whomever) simply spin up new instances (copies) of my initially configured server? How is state managed between all of them? Are there any good primers on this subject? It's hard to find much out there without getting caught up in the marketing.

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• Are large include files like iostream efficient? (C++)

  - by Keand64

  Iostream, when all of the files it includes, the files that those include, and so on and so forth, adds up to about 3000 lines. Consider the hello world program, which needs no more functionality than to print something to the screen: #include <iostream> //+3000 lines right there. int main() { std::cout << "Hello, World!"; return 0; } this should be a very simple piece of code, but iostream adds 3000+ lines to a marginal piece of code. So, are these 3000+ lines of code really needed to simply display a single line to the screen, and if not, do they create a less efficient program than if I simply copied the relevant lines into the code?

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• Exceptions and Access Violations in Paint events in Windows

  - by Patrick

  After executing some new code, my C++ application started to behave strange (incorrect or incomplete screen updates, sometimes no screen updates at all). After a while we found out that the new code is causing an Access Violation. Strange enough, the application simply keeps on running (but with the incorrect screen updates). At first we thought the problem was caused by a "try-catch(...)" construction (put there by an overactive ex-colleague), but several hours later (carefully inspecting the call stacks, adding many breakpoints, ...) we found out that if there's an Access Violation in a paint event, Windows catches it, and simply continues running the application. Is this normal behavior? Is it normal that Windows catches exceptions/errors during a paint event? Is there a way to disable this? (if not, it would mean that we have to always run in the debugger with all exceptions enabled while testing our code). Patrick

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• Letting a new PHP page know a new POST value is an Array?

  - by Wintermute

  I have a page that creates an associative array, then passes it as a hidden value to a new PHP page. I have a foreach loop waiting to iterate through it but it coughs up an "invalid argument" error, as if the page doesn't know the value it's working with is an array (Despite "print" showing simply "Array"). This is essentially what I have: //Hidden input to be passed to the next page print "<input type=\"hidden\" name=\"price_list\" value=\"$item_list\"> //Code on the second page for the foreach loop extract($_POST); foreach($price_list as $name=>$price) { ... } But I am simply given "Warning: Invalid argument supplied for foreach() in /home/cut/mg299/public_html/PHP/invoice.php on line 17". The array works fine, as I can iterate on the previous page, and other values are parsed fine to this second page. Do I need to 'reinitialise' this array value?

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• Animation using AniMate with Unity3D doesn't interact with physical objects

  - by Albz

  I'm designing a maze with Unity3D. The maze has a number of bifurcations and the player will stop before each bifurcation and simply choose left or right. Then an automatic animation will move the player through the next bifurcation till the end of the maze (or till a dead end). To animate the player I'm using AniMate and C# in my Unity project. Using AniMate I'm simply creating a point-to-point animation for each bifurcation (e.g. mage below: from the start/red arrow to point 5) My problem is that my animation script (associated to the "First Person Controller") is not working properly since physics is not respected (the player passes through walls). If in the same project I enable the standard character controls in Unity, then I can navigate in the maze with the physical contrains of walls etc... (i.e. I have colliders). This is an example of the code I'm using when I press left to pass from starting point, trough point 1 to point 2: void FixedUpdate () { if (Input.GetKey(KeyCode.LeftArrow)) { //To point 1 Hashtable props = new Hashtable(); props.Add("position", new Vector3(756f,112f,1124f)); props.Add("physics", true); Ani.Mate.To(transform, 2, props); //To point 2 Hashtable props2 = new Hashtable(); props2.Add("position", new Vector3(731f,112f,1124f)); props2.Add("physics", true); Ani.Mate.To(transform, 2, props2); } } What happens practically when I press the left arrow button is that the player moves directly to point 2 using a straight line passing through the wall. I tried to pass to AniMate "Physics = true" but it doesn't seem to help. Any idea on how to solve this issue? Alternatively... any hint on how to have a more optimized code and just use a series of vector3 coordinates (one for each point) to obtain the simple animation I want without having to declare new Hashtable(); etc... every time? I chose AniMate simply because 1. I'm a beginner with Unity 2. I don't need complex animations (e.g. I don't need to use iTween), just fixed animations along straight lines and I need something really simple and quick to implement in a script. However, if someone has an equally simple solution it will be welcome. thank you in advance for your help

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• Design for tagging system in GAE-J

  - by tempy

  I need a simple tagging system in GAE-J. As I see it, the entity that is being tagged should have a collection of keys referring to the tags with which it's associated. A tag entity should simply contain the tag string itself, and a collection of keys pointing to the entities associated with the tag. When an entity's list of tags is altered, the system will create a new tag if the tag is unknown, and then append the entity's key to that tag's key collection. If the tag already exists, then the entity's key is simply appended to the tag's key collection. This seems relatively straight-forward and uncontroversial to me, but I would like some feedback on this design, just to be sure.

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• Generating short license keys with OpenSSL

  - by Marc Charbonneau

  I'm working on a new licensing scheme for my software, based on OpenSSL public / private key encryption. My past approach, based on this article, was to use a large private key size and encrypt an SHA1 hashed string, which I sent to the customer as a license file (the base64 encoded hash is about a paragraph in length). I know someone could still easily crack my application, but it prevented someone from making a key generator, which I think would hurt more in the long run. For various reasons I want to move away from license files and simply email a 16 character base32 string the customer can type into the application. Even using small private keys (which I understand are trivial to crack), it's hard to get the encrypted hash this small. Would there be any benefit to using the same strategy to generated an encrypted hash, but simply using the first 16 characters as a license key? If not, is there a better alternative that will create keys in the format I want?

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• making use of c++ to speed up php

  - by Ygam

  I saw this post on Sitepoint quoting a statement by Rasmus Lerdorf which goes (according to Sitepoint) as follows: "How can you make PHP fast? Well, you can’t" was his quick answer. PHP is simply not fast enough to scale to Yahoo levels. PHP was never meant for those sorts of tasks. "Any script based language is simply not fast enough". To get the speed that is necessary for truly massive web systems you have to use compiled C++ extensions to get true, scaleable architecture. That is what Yahoo does and so do many other PHP heavyweights. Intrigued by the statement (not to mention the fact that up to now, all I was doing in PHP was small database-based apps), I was wondering how I could "use compiled C++ extensions" with PHP. Any ideas or resources?

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• Division to the nearest 1 decimal place without floating point math?

  - by John Sheares

  I am having some speed issues with my C# program and identified that this percentage calculation is causing a slow down. The calculation is simply n/d * 100. Both the numerator and denominator can be any integer number. The numerator can never be greater than the denominator and is never negative. Therefore, the result is always from 0-100. Right now, this is done by simply using floating point math and is somewhat slow, since it's being calculated tens of millions of times. I really don't need anything more accurate than to the nearest 0.1 percent. And, I just use this calculated value to see if it's bigger than a fixed constant value. I am thinking that everything should be kept as an integer, so the range with 0.1 accuracy would be 0-1000. Is there some way to calculate this percentage without floating point math?

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• web2py application logging

  - by MikeWyatt

  What is the recommended way to log application-specific messages in web2py? I found the documentation on HTTP logging, but I'm thinking more of messages for debugging and tracking. Should I simply use the logging module in each separate controller file? Is there a central place in which I could initialize a logger that can be shared between controllers? Or, is something built-in to web2py that I should use? Update: It looks like I can't even fully use the logging module in web2py. It looks like web2py ships with it's own version of the python libraries (in library.zip), which I'm not a big fan of. Is that by design? I'm guessing there will be issues with simply adding my installed Python libraries to the sys.path at run-time, so what should I do?

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• WPF: Text wrapping not working

  - by Ben

  I've got a grid defined simply: <Grid Margin="0,5,0,0"> <Grid.ColumnDefinitions> <ColumnDefinition Width="50"></ColumnDefinition> <ColumnDefinition Width="50"></ColumnDefinition> <ColumnDefinition Width="48"></ColumnDefinition> <ColumnDefinition Width="Auto"></ColumnDefinition> </Grid.ColumnDefinitions> Then I'm trying to bind some content like this: <TextBlock TextWrapping="Wrap" Grid.Column="3" Text="{Binding Text}"> Set up like this, the text won't wrap. It simply expands the column to fit the text. If I set the Width to a fixed amount on the last column, wrapping works as expected. The problem there is that if the user widens the window, the column stays at a fixed size. How can I get the column to size dynamically with the width of the grid, but still wrap the text within it?

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• log4j: Change format of loggers configured in another library.

  - by Ignacio Thayer

  Using clojure, I've been able to successfully setup log4j very simply by using this log4j.properties file, and including log4j in my classpath. # BEGIN log4j.properties log4j.appender.STDOUT=org.apache.log4j.ConsoleAppender log4j.appender.STDOUT.layout=org.apache.log4j.PatternLayout log4j.appender.STDOUT.layout.ConversionPattern=%d{MMdd HHmmss SSS} %5p %c [%t] %m\n log4j.rootLogger=DEBUG, STDOUT Then after :use'ing clojure.contrib.logging, I'm able to print a statement with the desired formatting as expected like so: (info "About to print this") (debug "This is debug-level") My question is how to achieve a consistent formatting for logging statements made from loggers configured in other libraries. I thought I could find existing loggers using org.apache.log4j.LogManager.getCurrentLoggers() and change the PatternLayouts there, but I'm not able to iterate over that enumeration in clojure, as I get the following error: Dont know how to create ISeq from: java.util.Vector$1 I assume this is possible somehow, and probably very simply. How? Thanks much.

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