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  • Most efficient method of generating PNG as HTTP response

    - by awj
    I've built an ASP.NET page whose output stream is a dynamically-generated PNG image containing only text on a transparent background. The text is based upon database IDs contained in the querystring. There will be a limited number of variations. Which one of the following would be the most efficient means of returning the image to the client? Store each variation upon the first generation, and thenceforth retrieve this from the drive. Simply generate the image each time. Cache the output response based upon the querystring.

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  • Generating new tasks in a foreach loop

    - by Scott Chamberlain
    I know from the codeing guidlines that I have read you should not do for (int i = 0; i < 5; i++) { Task.Factory.StartNew(() => Console.WriteLine(i)); } Console.ReadLine(); as it will write 5 5's, I understand that and I think i understand why it is happening. I know the solution is just to do for (int i = 0; i < 5; i++) { int localI = i; Task.Factory.StartNew(() => Console.WriteLine(localI)); } Console.ReadLine(); However is something like this ok to do? Task currentTask = myFirstTask; currentTask.Start(); foreach (Task task in _TaskList) { currentTask.ContinueWith((antecendent) => { if(antecendent.IsCompleated) { task.Start(); } else //do error handling; }); currentTask = task; } } or do i need to do this? Task currentTask = myFirstTask; foreach (Task task in _TaskList) { Task localTask = task; currentTask.ContinueWith((antecendent) => { if(antecendent.IsCompleated) { localTask.Start(); } else //do error handling; }); currentTask = task; }

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  • generating thumbnail image for video

    - by George2
    Hello everyone, I am using VSTS 2008 + C# + .Net 3.5 on Windows 7. I want to use Expression Encoder 3 to generate thumbnail image for video (wmv format) every 30 seconds -- e.g. for a 5 minutes video, there will be 10 thumbnails which reflects video at the time of 0 second, 30 second, 1 minute, 1 minute and 30 seconds, etc. Any reference code? thanks in advance, George

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  • Generating a perfectly distributed grid from array

    - by zath
    I'm looking for a formula or rule that will allow me to distribute n characters into a n*n grid with as perfect of a distribution as possible. Let's say we have an array of 5 characters, A through E. Here's an example of how it definitely shouldn't turn out: A B C D E B C D E A C D E A B D E A B C E A B C D The pattern is very clear here, it doesn't look "random". It would look better this way: A B C D E D E A B C B C D E A E A B C D C D E A B What I basically did here was place the A B C D E on the first row, then shift it by 2 on the second row, by 4 on the third row, 1 on the fourth row and 3 on the fifth row. Compared to the very bad example, this one shows no clear pattern. Though I'm certainly hoping there is a pattern, so I can use it to calculate not only small arrays such as this one, but arrays of any size. Any ideas as to how this can be accomplished?

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  • Shell Scripting: Generating output file name in script and then writing to it

    - by NewShellScripter
    Hello, I have a shell script where a user passes different sizes as command line arguments. For each of those sizes, I want to perform some task, then save the output of that task into a .txt file with the size in the name. How can I take the command line passed and make that part of a stringname for the output file? I save the output file in a directory specified by another command line argument. Perhaps an example will clear it up. In the foor lop, the i value represents the command line argument I need to use, but $$i doesnt work. ./runMe arg1 arg2 outputDir [size1 size2 size3...] for ((i=4; i<$#; i++ )) do ping -s $$i google.com >> $outputDir/$$iresults.txt done I need to know how to build the $outputDir/$$iresults.txt string. Also, the ping -s $$i doesnt work. Its like I need two levels of replacement. I need to replace the $[$i] inner $i with the value in the loop, like 4 for ex, making it $4. Then replace $4 with the 4th command line argument! Any help would be greatly appreciated. Thanks!

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  • Header redirect and Session start() generating errors

    - by RPK
    I am using following code. I get errors: Warning: Cannot modify header information - headers already sent by (output started at /home/public_html/mc/cpanel/Source/verifylogin.php:11) Warning: session_start() [function.session-start]: Cannot send session cookie - headers already sent by (output started at /home/public_html/mv/cpanel/Source/verifylogin.php:11) Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent (output started at /home/public_html/mv/cpanel/Source/verifylogin.php:11) <?php error_reporting(E_ALL^ E_NOTICE); ob_start(); require("../Lib/dbaccess.php"); $inQuery = "SELECT mhuserid, mhusername FROM cpanelusers WHERE mhusername = '". $_POST['UserName'] ."' AND mhpassword = '". hash('sha512', $_POST['Password']) ."'"; try { $Result = dbaccess::GetRows($inQuery); echo $Result; $NumRows = mysql_num_rows($Result); if ($NumRows > 0) { header("Location: http://www.example.com/cpanel/mainwindow.php"); session_start(); } else { header("Location: http://www.example.com/cpanel/"); echo "Last login attempt failed."; exit; } } catch(exception $e) { } ob_clean(); ?>

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  • JIRA: Generating per-user time report?

    - by John
    Sorry if SO is not the best place, but I have time-tracking enabled in JIRA and want to be able to generate a time-report for each user over a given date range. The only time-tracking report option I have is very limited and doesn't do what I want, is it possible through standard functionality or a free plugin perhaps?

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  • generating an objectForKey from an array

    - by Brian
    I'm having success when I use this code to get a string from an array of file names called "fileList": cell.timeBeganLabel.text = [[[self.fileList objectAtIndex:[indexPath row]] lastPathComponent] stringByDeletingPathExtension]; so I expected the same code to generate the same string as a key for me in this: NSDictionary *stats = [thisRecordingsStats objectForKey:[[[self.fileList objectAtIndex:[indexPath row]] lastPathComponent] stringByDeletingPathExtension]]; cell.durationLabel.text = [stats objectForKey:@"duration"]; or this: NSDictionary *stats = [thisRecordingsStats objectForKey:@"%@",[[[self.fileList objectAtIndex:[indexPath row]] lastPathComponent] stringByDeletingPathExtension]]; Both build without error, and the log shows my data is there: but I'm getting a blank UILabel. Have I not written the dynamic key generator correctly?

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  • Generating the input id with an ActiveRecord model

    - by swilliams
    How do you generate an input's id attribute, given a model? For example, if I have a model of Person with a first_name attribute, the form helper prints out a textbox with this html: <input type="text" id="person_first_name" /> How can I generate that person_first_name from some other place in the code (like in a controller or some place)?

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  • generating random enums

    - by null_radix
    How do I randomly select a value for an enum type in C++? I would like to do something like this. enum my_type(A,B,C,D,E,F,G,h,J,V); my_type test(rand() % 10); But this is illegal... there is not an implicit conversion from int to an enum type.

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  • Generating data on unlevel background

    - by bluejay93
    I want to make an unlevel background and then generate some test data on that using Matlab. I was not clear when I asked this question earlier. So for this simple example for i = 1:10 for j = 1:10 f(i,j)=X.^2 + Y.^2 end end where X and Y have been already defined, it plots it on a flat surface. I don't want to distort the function itself, but I want the surface that it goes onto to be unlevel, changed by some degree or something. I hope that's a little clearer.

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  • Dynamically generating method names in rails

    - by badnaam
    I need to generate links in my views using the url helpers such as user_path(@user), the catch is, in some cases I don't know what model I am creating this link for i.e. whether it is a user or a store or someting else I would like to be able to determine this on the fly and call the appropriate view helper, currently I am doing the following, but I am wondering if there is a drier way of doing it. if object.class == "Store" store_path(object) elsif object.class == "User" user_path(object) ...etc

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  • Generating dynamic data using Javascript

    - by methuselah
    Given that I have an array of alphabetical characters: var qwerty = [['q', 'w', 'e', 'r', 't', 'y', 'u', 'i', 'o', 'p'], ['a', 's', 'd', 'f', 'g', 'h', 'j', 'k', 'l'], ['z', 'x', 'c', 'v', 'b', 'n', 'm']]; How would I present them in three rows like on a conventional keyboard using JS without resorting to something like this: <input type='button' value='Q' id='bt1'/> <input type='button' value='W' id='bt2'/> <input type='button' value='E' id='bt3'/> <input type='button' value='R' id='bt4'/> <input type='button' value='T' id='bt5'/> <input type='button' value='Y' id='bt5'/> <input type='button' value='U' id='bt7'/> <input type='button' value='I' id='bt8'/> <input type='button' value='O' id='bt9'/> <input type='button' value='P' id='bt10'/> <br> <input type='button' value='A' id='bt11'/> <input type='button' value='S' id='bt12'/> <input type='button' value='D' id='bt13'/> <input type='button' value='F' id='bt14'/> <input type='button' value='G' id='bt15'/> <input type='button' value='H' id='bt16'/> <input type='button' value='J' id='bt17'/> <input type='button' value='K' id='bt18'/> <input type='button' value='L' id='bt19'/> <br /> ... Many thanks in advance!

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  • managed object subclasses are not generating implementation files and are incorrectly named

    - by mkc842
    In Xcode 4.6, I generated plenty of managed object subclass files without any problem. But now that I'm trying to do it in Xcode 5, it generates only a .h file. The header file has the correct properties, but it takes the name of my project, rather than the name of the core data entity I selected. Just to be sure I hadn't forgotten something, I carefully followed these steps . What could be going on? Thanks

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  • Complex Forms Generating Error

    - by user1648020
    I am working on an application that allows students to create a catalog of courses they are taking for a semester. I have created models for user; course; subject and category. Users can have many courses. Each course can have many subjects and categories. The tables for courses, subjects and categories include the following: Catalog: user_id; subject_id, category_id and course_id Courses: user_id; coursedetail_id Coursedetail: name; description Subject: name; description Category: name; description The idea is that an Admin can create a list of courses; subjects and categories and that the user can select the courses they want to add to their catalog. I have seperated courses and coursedetails because I envision that the coursedetails will grow overtime and the courses table will allow me to join the user_id and cousres details to rreport on if necessary. I attempted to follow Ryan's railscast on Complex Forms thinking that that I should use a complex form and has many relationship to get things working -- but I get an error in the catalog controller - cannot locate catalog_id which I know is in the table. I am now not sure if complex forms is the way to go or I should be looking at another direction to get the appropriate form in place. Any assistance would be appreciated.

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  • Links aren't generating

    - by user2680614
    I have a form and I can't get my links to generate. The next button is supposed to light up followed by a bit of text. How it's supposed to work: http://jsfiddle.net/zMQcn/ The one that doesn't work: http://jsfiddle.net/Yq8Qf/ document.getElementById("linkDiv").innerHTML="<input type=button value=Next onclick=\"window.location.href='http://yahoo.com/';\">other 8b white</input>"; }

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  • Prevent Nautilus from generating thumbnails for video files larger than 5 MB?

    - by Lisa
    If I set in Nautilus preferences that it should generate thumbnail previews only for files larger than 10 MB, then this only works for pictures. Nautilus still keeps generating thumbnails for videos and pdf files. Even if a video file is 500 MB. It should only generate thumbnails for video files less than 10 MB as set in the preferences. Same goes for pdf. I have many pdf files that are larger than 50 MB. I don't want Nautilus to generate thumbnails for these, only for small sized pdf. How can I make Nautilus to obey the Previews preferences? Nautilus 3.4.2 Ubuntu 12.04.1, 64bit

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  • What's the term describing this system for generating user interfaces?

    - by mjfgates
    So, there's this idea, which you already know: Define the layout of your UI by creating a tree of panels. The leaf nodes on the tree are what we used to call 'controls' way back in the day-- the things that the user interacts with, radio buttons and listboxes and such. The internal nodes are mostly concerned with layout; this kind of panel stacks its child panels vertically, that kind puts its children into a grid, etc. It's COMMON. Most of the UI-generating systems I've seen in the past twenty years are implementations of this, and the ones that aren't borrow from it. What's the word for this idea?

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  • How to handle exceptions from an image-generating Servlet?

    - by ssahmed555
    I have a simple (Servlet, JSP, and JSTL) web app whose main functionality is displaying images retrieved from a back-end server. The controller servlet forwards the user to a JSP that in turn uses another Servlet to display the resulting image on that same JSP. Further down, the JSP has a line similar to: <a href="<c:out value='${imageURL}'/>"><img src="<c:out value='${imageURL}'/>" alt="image view" border="1"></a> which invokes a GET request on the image-generating servlet causing it to generate the image. My question is: how do I handle Exceptions thrown by this image-generating servlet? I already have an error page defined (in web.xml) to handle ServletException within my web app but this doesn't work for this image-generating Servlet, and results in the following errors showing up in my Tomcat server logs: SEVERE: Exception Processing ErrorPage[exceptionType=javax.servlet.ServletException, location=/WEB-INF/ExceptionPage.jsp] java.lang.IllegalStateException: Cannot reset buffer after response has been committed What's my recourse in this situation? I'd like to be able to handle Exceptions thrown from this image-generating Servlet, and display some error on the main UI or forward the user to another error page.

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  • Generating an identifier for objects so that they can be added to a hashtable I have created

    - by dukenukem
    I have a hashtable base class and I am creating different type of hashtable by deriving from it. I only allow it to accept objects that implement my IHashable interface.For example - class LinearProbingHashTable<T> : HashTableBase<T> where T: IHashable { ... ... ... } interface IHashable { /** * Every IHashable implementation should provide an indentfying value for use in generating a hash key. */ int getIdentifier(); } class Car : IHashable { public String Make { get; set; } public String Model { get; set; } public String Color { get; set; } public int Year { get; set; } public int getIdentifier() { /// ??? } } Can anyone suggest a good method for generating an identifier for the car that can be used by the hash function to place it in the hash table? I am actually really looking for a general purpose solution to generating an id for any given class. I would like to have a base class for all classes, HashableObject, that implements IHashable and its getIdentifier method. So then I could just derive from HashableObject which would automatically provide an identifier for any instances. Which means I wouldn't have to write a different getIdentifier method for every object I add to the hashtable. public class HashableObject : IHashable { public int getIdentifier() { // Looking for code here that would generate an id for any object... } } public class Dog : HashableObject { // Dont need to implement getIdentifier because the parent class does it for me }

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