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• Trying to use tcl threads on windows 7 results in access violation.

  - by Juan

  I'm trying to get this simple program to work on windows, but it crashes: unsigned (__stdcall testfoo)(ClientData x) { return 0; } int main() { Tcl_ThreadId testid = 0; Tcl_CreateThread(&testid, testfoo, (ClientData) NULL, TCL_THREAD_STACK_DEFAULT, TCL_THREAD_NOFLAGS); } I am using a makefile generated by cmake and linking against a version of Tcl 8.5.7 I compiled myself using Visual C++ 2008 express. It was compiled using msvcrt,static,threads and the name of the resulting library is tcl85tsx.lib. The error is: Unhandled exception at 0x77448c39 in main.exe: 0xC0000005: Access violation writing location 0x00000014. The Tcl library works fine, and I can even run a threading script example by loading the Thread extension into it. My assumption is that there is something horribly wrong with a memory violation, but I have no idea what. Any help appreciated.

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• multitreading scheduling related java

  - by vichi

  class A implements Runnable{ B b=new B(); public void run(){ while(true){ System.out.println("H1"+Thread.currentThread().getName()); } } } public class Test { public static void main(String[] str){ A a1 =new A(); // A a2 =new A(); // Thread t1 =new Thread(a1, "Vichi"); Thread t2 =new Thread(a1,"Vishu"); t1.start(); t2.start(); } } what will be the ans: 1) only one of them will get the chance to execute 2) both will get chance in arbitrary manner please suggest possible ans with explations

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• Is there a way in C# 4.0 to have a method take a delegate with the parameters baked in?

  - by Rob Packwood

  I have this code for reporting on a simple demo app I am writing: private static void ReportOnTimedProcess(Action process) { var stopwatch = new Stopwatch(); stopwatch.Start(); process(); stopwatch.Stop(); Console.WriteLine("Process took {0} seconds", stopwatch.ElapsedMilliseconds*1000); } I basically want to track the time of any process. I am trying to have this method take a delegate as a parameter that can have any number of varying parameters. Is there some way an Expression can do this?

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• .NET's double.NaN - how does this counterintuitive feature work?

  - by GeReV

  I stumbled upon the definition of double.NaN in code: public const double NaN = (double)0.0 / (double)0.0; This is done similarly in PositiveInfinity and NegativeInfinity. double.IsNaN (with removing a few #pragmas and comments) is defined as: [Pure] [ReliabilityContract(Consistency.WillNotCorruptState, Cer.Success)] public static bool IsNaN(double d) { if (d != d) { return true; } else { return false; } } This is, by far, the most counterintuitive thing I have ever seen in the .NET framework. How is 0.0 / 0.0 represented "behind the scenes"? How can division by 0 be possible in double, and why does NaN != NaN?

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• Error : The Type Initializer of Daemon.Global threw an exception in c#

  - by srk

  I am using the below class file, where some variables are declared to use in the entire application. Now I used that variable BlockLogOut in another class file to make the value true. I just put this below line and getting error in it.. TypeInitializationException Global.BlockLogOut = True; The weird thing is, it was working fine for many months and i am getting this error now on the above line. Of course i was modifying some other stuffs in the application, but surely not this class file. What would have been the problem? namespace Daemon { class Global { public static bool BlockLogOut = false; } }

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• Why is the output like this?

  - by javatechi

  class another { public void method(Object o) { System.out.println("This is in method which takes object"); } public void method(String s) { System.out.println("This is method which takes string"); } } public class NewClass { public static void main(String args[]) { another an = new another(); an.method(null); } } When I try to execute this, I get This is method which takes string as the output. Why not "This is in method which takes object"? Object can also be null and string can also be null, why doesn't it invoke first method?

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• AppEngine Outage? What's happening?

  - by Albert

  I'm getting a lot of 500 errors recently (both static and dynamic requests). Making my application unavailable. The logs say the following: A problem was encountered with the process that handled this request, causing it to exit. This is likely to cause a new process to be used for the next request to your application. (Error code 121) The same code has been working well for quite some time. What's happening now? I'm using the High Replication Datastore and Python 2.5.

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• How to prevent unit test from using util from test project?

  - by calucier

  I am using eclipse and I have two projects, project1 and project1-test. Below is the example layout of my projects: project1 -src --my.package ----MyClass.java --my.package.util ----util.java project1-test -src --my.package ----MyClassTest.java --my.package.util ----util.java MyClass.java makes a static call to the util.java in project1. MyClassTests.java is testing MyClass.java. When the test class runs, it fails and complains that MyClass.java is referencing a method in util.java that doesn't exist. Under project1, the method being referenced exists in util.java but under project1-test, the method doesn't. When I run MyClassTests.java, the util.java that is being referenced from MyClass.java is from project1-test when it should be project1. Is there some way to make MyClass.java not reference util.java from project1-test when running MyClassTest.java?

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• Put an array of Objects in nodes of another array of Objects [JAVA]

  - by zengr

  public class hello { public static void main(String[] args) { Object[] newarray = new Object[1]; Object[] obj = new Object[2]; obj[0] = "Number1"; //string value obj[1] = "Number2"; //string value newarray[0] = obj; //this works Object[] tmp_obj = new Object[2]; tmp_obj = newarray[0]; //obviously does not work System.out.println(tmp_obj[0]); //nope System.out.println(tmp_obj[1]); //nope } } So, now if I want to access the values "Number1" and "Number2" which are stored in obj[0] and obj[1]; obj is in newarray[0]. what should I do? Is this a possible? Thanks

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• Best practices to test protected methods with PHPUnit

  - by GrGr

  Hello, I found the discussion on Do you test private method informative. I have decided, that in some classes, I want to have protected methods, but test them. Some of these methods are static and short. Because most of the public methods make use of them, I will probably be able to safely remove the tests later. But for starting with a TDD approach and avoid debugging, I really want to test them. I thought of the following: Method Object as adviced in an answer seems to be overkill for this. Start with public methods and when code coverage is given by higher level tests, turn them protected and remove the tests. Inherit a class with a testable interface making protected methods public Which is best practice? Is there anything else? It seems, that JUnit automatically changes protected methods to be public, but I did not have a deeper look at it. PHP does not allow this via reflection.

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• CMS or roll-yer-own?

  - by girlwithglasses

  I have a database of software tools and I want to be able to have users rate and comment on the tools, and view the ratings and comments that other users have left. To lower the risk of spammers attacking the site, I would like to be able to restrict comment/rating permissions to those who are logged in. At present, the tools are in a list on a static html page as part of a website that is very "non-interactive"; other than the contact form, there is nowhere that users contribute content to the site. We maintain a wiki (of the standard mediawiki flavour) that users can contribute to, and we also have a Drupal installation as a news site. Does anyone have any experience of creating such a rating/commenting system, and whether it would be better to use Mediawiki or Drupal (or another free CMS?), or to try to create something myself? Any advice would be appreciated. Thanks!

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• UDK "Error, Accessing a member of _'s within class through a context expression requires explicit 'O

  - by Ricket

  I get the following error in the UDK Frontend when I try to make my project: C:\UDK\UDK-2010-03\Development\Src\FixIt\Classes\ZInteraction.uc(58) : Error, Accessing a member of GameUISceneClient's within class through a context expression requires explicit 'Outer' The class ZInteraction extends Interaction. Line 58 is: GetSceneClient().ConsoleCommand("KEYNAME"@Key); What is the problem here? I am still investigating and I will update as I find out more. edit: Tried fixing the line up as class'UIRoot'.static.GetSceneClient().ConsoleCommand("KEYNAME"@Key); - no change.

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• Adding a html file into a c# email app

  - by neilos

  using System; using System.Net; using System.Net.Mail; class MainClass { public static void Main(string[] args) { SmtpClient client = new SmtpClient("192.168.1.12", 25); using (MailMessage msg = new MailMessage()) { msg.From = new MailAddress("[email protected]"); msg.Subject = "***Dexter DB***"; msg.Body = "***DB backup done***"; // I want to change this so i can do this in html file - how do i pick up this file and send a html form? msg.To.Add(new MailAddress("[email protected]")); client.Send(msg); } } }

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• Resizing gives me to heavy image

  - by phenevo

  Hi, I'm resizing jpeg 1200x900 ,556kb by method: public static Image ResizeImage(Image imgToResize, int height) //height=400 { int destWidth; int destHeight; int sourceWidth = imgToResize.Width; int sourceHeight = imgToResize.Height; float nPercent = 0; float nPercentH = 0; nPercentH = ((float)height / (float)sourceHeight); nPercent = nPercentH; destWidth = (int)(sourceWidth * nPercent); destHeight = height; Bitmap b = new Bitmap(destWidth, destHeight); Graphics g = Graphics.FromImage((Image)b); g.InterpolationMode = InterpolationMode.HighQualityBicubic; g.DrawImage(imgToResize, 0, 0, destWidth, destHeight); g.Dispose(); return b; } gives me 555kb 533x400 jpeg. Why this photo is so heavy. For photo jpeg 2111kb 2156x1571 I get 556kb 533x400 jpeg Why in first case is so terrible !

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• Run .exe packaged in .jar

  - by user1471327

  I am trying to merge 2 programs I have made to one .jar file. One program is a .jar written in java and the second one is an .exe written in c++. I put both files to the new .jar, wrote this code but it didn't work. When this code was exported to .jar and executed neither of 2 files ran and I got error "no main manifest attribute, in merged.jar" in cmd. Though it worked perfectly when run in eclipse. public class main { public static void main(String[] args) { try { Runtime.getRuntime().exec("cmd /c project1.jar"); Runtime.getRuntime().exec("cmd /c project2.exe"); } catch(Exception exce) { /*handle exception*/ } } } Any idea how to fix this or is there another way to do it? I am new to java, so can't think of anything good. Maybe it would be possible to drop these files to a temporary location in windows and delete them after they're executed?

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• Background position image overlay (Works in IE, not in Mozilla/Chrome/Safari)

  - by amm229

  Hi all, I am having an issue positioning a background image using the following jquery background position command in Firefox, Google Chrome, and Safari. The code works correctly in IE 8. $('#element).css({ backgroundPosition: 'xpx ypx' }); The x position of the image is calculated dynamically based on window size and the y position is static. The css appears to be modified correctly, however, the background image I am attempting to overlay is absent. See jscript code below: $(window).resize(function () { // image positioning variables var windowwidth = $(window).width(); var imgwidth = $('#imgFluid').width(); var offset = $('#divFluidBlur').offset(); // calculate and implement position blurPositionLeft = (windowwidth - imgwidth) - offset.left; $('#divFluidBlur').css({ backgroundPosition: blurPositionLeft + 'px' + ' 30px' }); // debug: display actual css Background Position of element to text box $("#txtActualBackgroundpos").val(document.getElementById ("divFluidBlur").style.backgroundPosition); Thanks in advance for your help, Andrew

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• How do you stop Eclipse from inserting a certain class in Content-Assist?

  - by fletchgqc.mp

  I'm using SpringSource Tool Suite (Eclipse) to program with Grails, and I'm also using JFreechart in the program. In Grails you log by typing log.info("method worked"). Unfortunately JFrechart has a class called "Log" with Static methods like "info". This means that in STS I type log.info and then when I type space or ( Eclipse "assists" me by importing the JFreechart Log class and changing what I've typed to Log.info(message). Very irritating. I reckon I could turn off the Eclipse option to "insert single proposals automatically", but I like this feature. Can I instruct Eclipse not to give me content assist from this particular JFreechart class?

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• Sharing base object with inheritance

  - by max

  I have class Base. I'd like to extend its functionality in a class Derived. I was planning to write: class Derived(Base): def __init__(self, base_arg1, base_arg2, derived_arg1, derived_arg2): super().__init__(base_arg1, base_arg2) # ... def derived_method1(self): # ... Sometimes I already have a Base instance, and I want to create a Derived instance based on it, i.e., a Derived instance that shares the Base object (doesn't re-create it from scratch). I thought I could write a static method to do that: b = Base(arg1, arg2) # very large object, expensive to create or copy d = Derived.from_base(b, derived_arg1, derived_arg2) # reuses existing b object but it seems impossible. Either I'm missing a way to make this work, or (more likely) I'm missing a very big reason why it can't be allowed to work. Can someone explain which one it is? [Of course, if I used composition rather than inheritance, this would all be easy to do. But I was hoping to avoid the delegation of all the Base methods to Derived through __getattr__.]

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• Java print binary number using bit-wise operator

  - by user69514

  Hi I am creating a method that will take a number and print it along with its binary representation. The problems is that my method prints all 0's for any positive number, and all 1's for any negative number private static void display( int number ){ System.out.print(number + "\t"); int mask = 1 << 31; for(int i=1; i<=32; i++) { if( (mask & number) != 0 ) System.out.print(1); else System.out.print(0); if( (i % 4) == 0 ) System.out.print(" "); } }

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• Strange C++ thread function invocation

  - by Tony

  I have the following: class DThread { virtual void run()=0; _beginthreadex(NULL,0,tfunc,this,0,&m_UIThreadID); // class itself being passed as param to thread function... static unsigned int __stdcall tfunc(void* thisptr) { static_cast<DThread*>(thisptr)->run(); return 0; } //other stuff } The run function is implemented in a derived class. Why is the function that's being called in the thread being called through a cast this pointer? Is this good practise? Can't it just be called directly? The actual function needing to run is in the derived class. My question is

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• Extreamely fast way to clone the values of an array into a second array?

  - by George

  I am currently working on an application that is responsible for calculating random permutations of a multidemensional array. Currently the bulk of the time in the application is spent copying the array in each iteration (1 million iterations total). On my current system, the entire process takes 50 seconds to complete, 39 of those seconds spent cloning the array. My array cloning routine is the following: public static int[][] CopyArray(this int[][] source) { int[][] destination = new int[source.Length][]; // For each Row for (int y = 0; y < source.Length; y++) { // Initialize Array destination[y] = new int[source[y].Length]; // For each Column for (int x = 0; x < destination[y].Length; x++) { destination[y][x] = source[y][x]; } } return destination; } Is there any way, safe or unsafe, to achieve the same effect as above, much faster?

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• Method to concatenate 2 Strings in Java

  - by GooF

  I have a method in Java that concatenates 2 Strings. It currently works correctly, but I think it can be written better. public static String concat(String str1, String str2) { String rVal = null; if (str1 != null || str2 != null) { rVal = ""; if (str1 != null) { rVal += str1; } if (str2 != null) { rVal += str2; } } return rVal; } Here are some of the requirements: If both str1 and str2 are null, the method returns null If either str1 or str2 is null, it will just return the not null String If str1 and str2 are not null, it will concatenate them It never adds "null" to the result Can anyone do this with less code?

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• C# Console Application Output to .csv file

  - by Zinn

  I am trying to make a program that will show the numbers: 1, 10 +30 2, 40 (the scale goes up in this pattern by adding 20 to the last number added) 3, 90 +50 4, 160 5, 250 +70 So far I have this code: using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.IO;// namespace Myloop { class Program { static void Main(string[] args) /// </summary> { StreamWriter myOutputStream = new StreamWriter("loopdata.csv"); int forloop; for (forloop = 1; forloop < 21; forloop++) Console.WriteLine(forloop); Console.ReadLine(); myOutputStream.Close(); } } } This is showing the first sequence of numbers 1 - 20, but could anyone give me any guidance how to do the other sequence next to it in the console application and how I can output these to a .csv file, as the information I have so far doesn't appear in the .csv file

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• How to setup custom CSS based on account settings in a Django site?

  - by sdolan

  So I'm writing a Django based website that allows users select a color scheme through an administration interface. I already have middleware/context processors that links the current request (based on domain) to the account. My question is how to dynamically serve the CSS with the account's custom color scheme. I see two options: Add a CSS block to the base template that overrides the styles w/variables passed in through a context processors. Use a custom URL (e.g. "/static/dynamic/css//styles.css") that gets routed to a view that grabs all the necessary values and creates the css file. I'm content with either option, but was wondering if anyone else out there has dealt with similar problems and could give some insight as to "Best Practices".

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• correct technical term for this pattern

  - by Oliver A.

  sometimes I use a pattern which is very similar to the singleton pattern: There is one default instance which and a static get method to aces it. But you may create other instances and pass it as optional parameter and if you want to and you can even replace the default instance with a instance from a child class. So it is NO SINGLETON at all but it is used like one singleton in most cases. Anyone got an idea who to call something like this ? Maybe half*** singleton? domiton?

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