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• Bug when drawing a QImage on a widget with PIL and PyQt

  - by oulipo

  I'm trying to write a small graphic application, and I need to construct some image using PIL that I show in a widget. The image is correctly constructed (I can check with im.show()), I can convert it to a QImage, that I can save normally to disk (using QImage.save), but if I try to draw it directly on my QWidget, it only show a white square. Here I commented out the code that is not working (converting the Image into QImage then QPixmap result in a white square), and I made a dirty hack to save the image to a temporary file and load it directly in a QPixmap, which work but is not what I want to do https://gist.github.com/f6d479f286ad75bf72b7 Someone has an idea? If it can help, when I try to save my QImage in a BMP file, I can access its content, but if I try to save it to a PNG it is completely white

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• changing Python code in the debugger

  - by max

  Is there any debugger that allows Python code to be changed while debugging? In other words: run-time exception occurs, debugger stops, I change the code any way I like, and tell the program to continue. I am aware of the problems with this approach, such that references to functions would still point to the old definitions if I redefine the function on the fly, and so on. I am ok with that, since I just want to be able to make small fixes in very simple circumstances. On the other hand, I'm also interested in whether it's theoretically possible to allow changes to Python code without running into these problems: i.e., somehow update all the references to the objects that changed, etc. I'm nearly sure the answer to the second question is no, but if I'm wrong, I'd like to know. EDIT: If my goal (changing the code interactively when an exception occurred, and then continuing execution), is achievable without a debugger - that would be good as well. I don't need to use the debugger.

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• Enable scratch buffer to execute R code in emacs-ess

  - by sheed03

  Hello, I have switched to using emacs-ess for my R code development and it is working great. I would like to be able to write some small R code I am using for debugging my R script into the scratch buffer, and be able to execute the scratch buffer code in the R process buffer. I've found how I could change the scratch buffer's mode to text by putting the following in the .emacs file: (setq initial-major-mode 'text-mode) Is there a similar statement I can put in my .emacs file that would make the scratch buffer have the ess-mode? I tried the following which results in an error about wrong type argument: (setq initial-major-mode 'ess-mode)

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• What Simple Changes Made the Biggest Improvements to Your Delphi Programs

  - by lkessler

  I have a Delphi 2009 program that handles a lot of data and needs to be as fast as possible and not use too much memory. What small simple changes have you made to your Delphi code that had the biggest impact on the performance of you program by noticeably reducing execution time or memory use? Thanks everyone for all your answers. Many great tips. For completeness, I'll post a few important articles on Delphi optimization that I found. Before you start optimizing Delphi code at About.com Speed and Size: Top 10 Tricks also at About.com Code Optimization Fundamentals and Delphi Optimization Guidelines at High Performance Delphi, relating to Delphi 7 but still very pertinent.

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• How to measure the time HTTP requests spend sitting in the accept-queue?

  - by David Jones

  I am using Apache2 on Ubuntu 9.10, and I am trying to tune my configuration for a web application to reduce latency of responses to HTTP requests. During a moderately heavy load on my small server, there are 24 apache2 processes handling requests. Additional requests get queued. Using "netstat", I see 24 connections are ESTABLISHED and 125 connections are TIME_WAIT. I am trying to figure out if that is considered a reasonable backlog. Most requests get serviced in a fraction of a second, so I am assuming requests move through the accept-queue fairly quickly, probably within 1 or 2 seconds, but I would like to be more certain. Can anyone recommend an easy way to measure the time an HTTP request sits in the accept-queue? The suggestions I have come across so far seem to start the clock after the apache2 worker accepts the connection. I'm trying to quantify the accept-queue delay before that. thanks in advance, David Jones

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• MATLAB for kids?

  - by yuk

  My seven-years old expresses large interest in computers (well, who doesn't? :). Since I'm mostly program in MATLAB, I'm thinking why not to teach him MATLAB. We did a small project with him (he had to solve as many simple arithmetic problems as possible in a limited time) and he get pretty excited. I coded, he watched and then tested. He also likes to do create interesting graphics and simple animations. So, what's next? I would appreciate any ideas for interesting projects, games, graphics? What math concepts he has to understand to program in MATLAB? Or may be you would say it's too early and we should start with something like Logo, Scratch or Alice?

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• Spectral Reconstruction

  - by Hani

  I have a small system which consist of: Led Clusters, camera(RGB or grayscale) and an object to be detected. I am emitting a light from the LED clusters (ex: yellow). After emitting light on the object, I am capturing an image for the object from the camera. I want to get the spectral image of the object from the captured image. Please if any one knows the algorithm or a code for this purpose(grayscale or RGB camera), tell me. Thanks.....

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• ASP.NET MVC 2.0: How to read querystring value

  - by Shyju

  I am trying to build a small ASP.NET MVC 2 application.I have a controller class with the below method in it public ActionResult Index() { TestMvc.Models.PersonalInformation objPerson = new TestMvc.Models.PersonalInformation(); objPerson.FirstName = "Shyju"; objPerson.LastName = "K"; objPerson.EmailId="[email protected]"; return View(objPerson); } And when the page (View) being called, i can see this data there as my view has these data's displaying. Now i want to know how can i pass a query string in the url and use that id to build the PersonalInformation object.Hoe can i read the querystring value ? Where to read ? I want the quesrtstring to be like http://www.sitename/user/4234 where 4234 is the user id

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• best practices - multiple functions vs single function with switch case

  - by Amit

  I have a situation where I need to perform several small (but similar) tasks. I can think of two ways to achieve this. First Approach: function doTask1(); function doTask2(); function doTask3(); function doTask4(); Second Approach: // TASK1, TASK2, ... TASK4 are all constants function doTask(TASK) { switch(TASK) { case TASK1: // do task1 break; case TASK2: // do task2 break; case TASK3: // do task3 break; case TASK4: // do task4 break; } } A few more tasks may be added in future (though the chances are rare. but this cannot be ruled out) Please suggest which of the two approaches (or if any other) is a best practice in such a situation.

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• Problem with SqlServer 2005 when opening connections

  - by Jose Obregon

  I have a Winforms application and I use EntLib to connect to a SQL Server 2005 DB. The application is working ok, but sometimes, and lately more often, we have started receiving this error from the db when opening the connection: A connection was successfully established with the server, but then an error occurred during the login process. (provider: Shared Memory Provider, error: 0 - No process is on the other end of the pipe.) (Microsoft SQL Server, Error: 233) The problem is intermittent. The user works well for a couple of hours and then suddenly the exception is thrown. Sometimes it happens when we run a small process that loads a file and then inserts the data to the db.

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• Free data warehouse - Infobright, Hadoop/Hive or what ?

  - by peperg

  I need to store large amount of small data objects (millions of rows per month). Once they're saved they wont change. I need to : store them securely use them to analysis (mostly time-oriented) retrieve some raw data occasionally It would be nice if it could be used with JasperReports or BIRT My first shot was Infobright Community - just a column-oriented, read-only storing mechanism for MySQL On the other hand, people says that NoSQL approach could be better. Hadoop+Hive looks promissing, but the documentation looks poor and the version number is less than 1.0 . I heard about Hypertable, Pentaho, MongoDB .... Do you have any recommendations ? (Yes, I found some topics here, but it was year or two ago)

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• High CPU usage when running several "java -version" in parallel

  - by Prateesh

  This is just out of curiosity to understand i have a small shell script for ((i = 0; i < 50; i++)) do java -version & done when i run this my CPU usage report by sar is as below 07:51:25 PM CPU %user %nice %system %iowait %steal %idle 07:51:30 PM all 6.98 0.00 1.75 1.00 0.00 90.27 07:51:31 PM all 43.00 0.00 12.00 0.00 0.00 45.00 07:51:32 PM all 86.28 0.00 13.72 0.00 0.00 0.00 07:51:33 PM all 5.25 0.00 1.75 0.50 0.00 92.50 As you can see, on the third line the CPU is at 100% My java version is 1.5.0_22-b03.

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• PHP Session Cookies fail with users changing IP

  - by Columbo

  Hello, I have a login script for a small application that works by storing session cookies and checking them on each page to make sure the user is logged in. One of the two users who uses the system keeps getting logged out randomly. This appears to be down to the session cookie that shows then authenticated no longer being present. After a lot of investigation the only thing I can see that is different about this user is that their IP address is changing (today it was changing every hour (their on Sky)). The only thing is the change of IP address has happened 5 times this morning and only once has the user been logged off. Has anyone had a similar issue? Are session cookies in someway tied to IP addresses? Any help or links much appreciated. Thanks C

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• How write an ads server

  - by Nisanio

  Hi everyone I want to write an ads server (like OpenX), just for fun and learning (they aren't the same). But my idea, more than writing an entire application with web interface and so on, is to write a very tiny core that provides the basic functionality in the most efficient way, like a library that other people can use to write a complete application more fitted to their needs. The objective is to make it small, very efficient and fast. Can someone help me with a list of the minimal functionality needed for this kind of application?. An Ads Server isn't only a banner delivery, there are differents methods (for example OpenX uses a very weird javascript code that i don't understand completely) Any help or guidance is more than welcome...Thanks

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• Fast partial sorting algorithm

  - by trican

  I'm looking for a fast way to do a partial sort of 81 numbers - Ideally I'm looking to extract the lowest 16 values (its not necessary for the 16 to be in the absolutely correct order). The target for this is dedicated hardware in an FPGA - so this slightly complicated matters as I want the area of the resultant implementation as small as possible. I looked at and implemented the odd-even merge sort algorithm, but I'm ideally looking for anything that might be more efficient for my needs (trade algorithm implementation size for a partial sort giving lowest 16, not necessarily in order as opposed to a full sort) Any suggestions would be very welcome Many thanks

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• C# Process flow - Datastream, XML and datagrid

  - by Farstucker

  Im looking for some advice/suggestions on how I should setup the work flow of a small application Im building. When the application is launched the datagrid will be populated via the XML file. Once running the application will receive a datastream that I hope to update the file and datagrid. So Im curious what you would suggest on how I setup the workflow (ie, split the data from the data stream and simultaneously populate the file and grid or would you suggest populating the XML file first and setting up a timer to have the grid read the file?) Im really looking for optimal performance.

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• Will be self-taught limit me?

  - by Isaiah

  I'm 21 and am pretty efficient in html/css, python, and javascript. I also know my way around lisp languages and enjoy programing in them. My problem is that I'm extremely self-taught and not quite confident that I could land a job programing, but I really need a job soon as I've just become a father. I haven't even created a resume yet because I'm not really sure what to put on it except my lone experience. So I wanted to ask, will being primarily self-taught with some experience on small projects I've done for a few clients limit me too much? I mean I know I need some kind of education so I've enrolled part time in a community college to work on a degree in computer science, but it's years till then. And if it will limit me a lot, what kind of skills would be good to work on to make my chances any better? Thank You

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• How do I create a check constraint?

  - by Zack Peterson

  Please imagine this small database... Diagram Tables Volunteer Event Shift EventVolunteer ========= ===== ===== ============== Id Id Id EventId Name Name EventId VolunteerId Email Location VolunteerId Phone Day Description Comment Description Start End Associations Volunteers may sign up for multiple events. Events may be staffed by multiple volunteers. An event may have multiple shifts. A shift belongs to only a single event. A shift may be staffed by only a single volunteer. A volunteer may staff multiple shifts. Check Constraints Can I create a check constraint to enforce that no shift is staffed by a volunteer that's not signed up for that shift's event? Can I create a check constraint to enforce that two overlapping shifts are never staffed by the same volunteer?

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• Packaging up ASPX, CSS and image files

  - by silves89

  I'm designing a simple framework for small websites to be used in an intranet. The websites will all be similar, but there will be a few pages, or controls on pages, that are different. I would like to be able to version and maintain the common framework part of the websites as if they were a regular library - if I need to update CSS then I only have to do it in one place. Can I package-up ASPX files, images and CSS and distribute them like this? What am I missing? My goal is to allow the developers of the few core content pages to get up and running with the websites quickly, with standard styles and images. Thanks!

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• Uncompressing zlib data using boost::iostreams::filtering_streambuf trouble

  - by GuitaringEgg

  I'm trying to write a small class that will load the chunk data from part of a minecraft world file. I'm to the point where I have stored some data in a char array which was compressed with zlib and need to decompress it. I'm trying to use the boost filtering_streambuf to do this. char * rawChunk = new char[length - 1]; // Load chunk data stringstream ssRawChunk(rawChunk); boost::iostreams::filtering_istream in; in.push(boost::iostreams::zlib_decompressor()); in.push(ssRawChunk); stringstream ssOut; boost::iostreams::copy(in, ssOut); My problem is that rawChunk contains null data, so when coping data from (char*) rawChunk to (stringstream) ssRawChunk, it terminates at ~257 instead of the expected length 2154. Is there any way to use filtering_streambuf without stringstream to allow for null data or is there a way to stop stringstream to not terminate on null data?

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• Can I use XText for a DSL involving an XML file type?

  - by Chris

  I have defined a small DSL that is mostly written in the form of different types of XML files in conjuction with some property files. This works very well but I wish to create an Eclipse Editor to make editing these files easier for beginners (I already have a working parser). The main XML file can reference some items from the .properties files and vice-versa. THe main xml file can also reference other XML files. Certain options should only be available in the main xml file based on the contents of the .properties files and based on some osgi plugins that can be added to the DSL project (the syntax is dynamic depending on context). The structure of the language is fixed but the options available in each attribute or the choice of attributes themselves changes depending on metadata contained in plugin .jar files. Questions: Does XText support dynamic syntax (validation changes depending on external factors)? Does XText support XML files / .properties files? Thank you very much for your help in advance.

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• Accessing a master page from httphandler

  - by vondip

  Hi All, I am developing a small application in asp.net (writing in c#). In my application I am using jquery to perform asynchronous call to the server. I have an http handler that listens in to the requests and does what it needs to do. Problems start when in the handler I need to access information stored in the page , from where the asynchronous call started. When I try this: Page page = HttpContext.Current.Handler as Page; I don't get a page. How else can I access the page itself? Thank you

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• Appearance of a WPF ListView under Windows Vista and Windows XP is not the same

  - by rem

  In a WPF application I have a ListView: <ListView Name="ItemSelList" ItemsSource="{Binding ItemColl}" SelectionChanged="ItemSelList_SelectionChanged"> <ListView.View> <GridView> <GridViewColumn Header="Date" Width="90" DisplayMemberBinding="{Binding Date}"/> <GridViewColumn Header="Time" Width="90" DisplayMemberBinding="{Binding Time}"/> <GridViewColumn Header="Description" Width="250" DisplayMemberBinding="{Binding Description}"/> </GridView> </ListView.View> </ListView> When running application under Windows Vista, everything is OK. When running under Windows XP - the default font size of ListView's rows is too small and rows of the ListView don't change color when user hovers with a mouse over them. How to do so that ListView appearance under Windows XP is the same as under Vista?

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• Internationalize HelloWorld program .NET

  - by RockStarInTraining

  I have small test app which has 2 resource files (Resources.resx & Resources.de-DE.resx) with the same exact string names, but one has the strings converted to German. For my form I set the Localize property to ture. In my application I am getting the strings as such: this.Text = Properties.Resources.frmCaption; In my release folder I get a de-DE folder with a dll named International_test.resources.dll. I try to distribute this to a machine which is set to German and all of the strings pulled are still english. I tried keeping the International_test.resources.dll in the de-DE folder or just put in in my apps directory. What am I doing wrong or what do I need to do to get the German resource file to be used?

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• navigateToUrl AS3 is not opening a web browser

  - by Ronnie

  I have a textField on my stage named 'adBuy', which when clicked I want to open up my browser with the defined in URL request. However when I click on the 'adBuy' textField on my SWF it opens Coda, the piece of software I'm using to write this small piece of code? I am puzzled. Here is my code: adBuy.defaultTextFormat = adFormat; adBuy.textColor = 0xFF65CB; adBuy.x = 640; adBuy.y = 455; adBuy.text = "Buy Now"; parent.addChild(adBuy); adBuy.addEventListener(MouseEvent.CLICK, buyAdvert); var request:URLRequest = new URLRequest("http://www.google.co.uk"); function buyAdvert(event:MouseEvent):void { navigateToURL(request, "_blank"); trace("link clicked"); } Is there an error in my code, or is this a common problem for which there is an answer?

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