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• Question about Java File Reader.

  - by Cris Carter

  Hello. I'm having some problems with the FileReader class. How do I specify an offset in the lines it goes through, and how do I tell it when to stop? Let's say I want it to go through each line in a .txt file, but only lines 100-200 and then stop? How would I do this? Right now I'm using ReadLine() but I don't think there's a way to specify offset with that. Any fast help is VERY appreciated. Thanks.

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• QObject cloning

  - by Olorin

  I know that Qobjects are supposed to be identities not values eg you cannot copy them and by default the copy constructor and asignment are disabled as explained in qt documentation. But is it possible to create a new Qobject from an existing one using a clone method? Would this be a logic error ? If i say QObject b; QObject a; b.cloneFrom(a); or QObject a = new QBject(); QObject b = new QBject(); b->cloneFrom(a); and the clone method copyes stuff like members etc would this be wrong? And if this is ok can i write my own copy constructor and asignment operator that does just that? Note: i actually want to try this with classes that inherit qobject.

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• jQuery event handlers always execute in order they were bound - any way around this?

  - by asgeo1

  It can be anoying that jQuery event handlers always execute in the order they were bound. For example: $('span').click(doStuff1()); $('span').click(doStuff2()); clicking on the span will cause doStuff1() to fire, followed by doStuff2(). At the time I bind doStuff2(), I would like the option to bind it before doStuff1(), but there doesn't appear to be any easy way to do this. I suppose most people would say, just write the code like this: $('span').click(function (){ doStuff2(); doStuff1(); }); But this is just a simple example - in practise it is not always convienient to do that. There are situations when you want to bind an event, and the object you are binding to already has events. And in this case you may simply want the new event to fire before any other existing events. So what is the best way to achieve this in jQuery?

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• How to overide the behavior of Input type="file" Browse button

  - by jay sean

  Hi All, I need to change the locale/language of the browse button in input type="file" We have a special function to change the locale of any text to the browser language such as en-US es-MX etc. Say changeLang("Test"); //This will display test in spanish if the browser locale is es-MX What I need to do is to change the language of the browse button. Since it is not displayed, I can't code it like changeLang("Browse..."); That's why I need to get the code of this input type and overide so that I can apply my funtion to Browse text. It will be appreciated if you can give a solution for this. Thanks! Jay...

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• Efficient Map Overlays in and drawing Lines on Android Google Map...

  - by Ahsan

  Hi Friends, I want to do the following and am kind of stuck on these for a few days.... 1) I have used helloItemizedOverlay to add about 150 markers and it gets very very slow.....any idea what to do ? I was thinking about threads....(handler) ... 2) I was trying to draw poly lines ( I have encoded polylines, but have managed to decoded those) that move when I move the map..... 3) I was looking for some sort of a timer class that executes, say, every 1 minute or so.... 4) I was also looking for ways to clear the Google map from all the markers/lines etc.... Thanks a lot... :) - ahsan

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• PowerPoint version compilation

  - by Jeremy A

  Let's say I am using SharpDevelop/VS to develop an app that uses PowerPoint. Do I need to recompile the app so there is a build for each version of MS Office? I have MS Office 2007, but I would also like the app to work with Office 2003 and later, without having to recompile the app for each version. Do I just need to install the appropriate Office Interop redistributable package/msi on the client machine, and ship my app as is? Thanks in advance for your help.

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• Database Schema for survey polling application with a default choice.

  - by user156814

  I have a survey application, where users can create surveys and give choices for every survey. Other users can choose their answers for the aurvey and then polls are taken to get the results of the survey. I already have the database schema for this Questions id, user_id, category_id, question_text, date_started Answers id, user_id, question_id, choice_id, explanation, date_added Choices id, question_id, choice_text As for now, users can choose their own choice answers to their surveys... but I want to be able to add a default "I dont care" or "I dont know" choice to every survey for people who simply dont care about the topic to take sides or who cant choose. So lets say theres a survey that asks who was a better president, George W. Bush, Bill Clinton, Ronald Reagon, or Richard Nixon... I want to be able to add a default "I dont care" option. I was thinking to just add that extra choice EVERY TIME a user creates a survey, but then I wouldn't have much control over the text for that choice after that survey has been created, and I want to know if theres a better way to do this, like create another table or something Thanks

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• Setting up nHibernate with an Oracle database and Visual Studio 2010

  - by Geoff

  I'm creating a .ASPNET project and I would like to setup nHibernate as my ORM tool. I will be using an existing oracle database and Visual Studio 2010. ORM tools are very new to me and really could use any advice to better understand the tool and the process required to implement them. I've been following an article at http://nhforge.org/wikis/howtonh/your-first-nhibernate-based-application.aspx to learn about it and am stuck where they say to create a local database as mine only give me the option to create a SQL server database (perhaps this a new for visual studio 2010?). Is the purpose of this database just to cache results from the live database? Thanks for your help! Geoff

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• Python objects as userdata in ctypes callback functions

  - by flight

  The C function myfunc operates on a larger chunk of data. The results are returned in chunks to a callback function: int myfunc(const char *data, int (*callback)(char *result, void *userdata), void *userdata); Using ctypes, it's no big deal to call myfunc from Python code, and to have the results being returned to a Python callback function. This callback work fine. myfunc = mylib.myfunc myfunc.restype = c_int myfuncFUNCTYPE = CFUNCTYPE(STRING, c_void_p) myfunc.argtypes = [POINTER(c_char), callbackFUNCTYPE, c_void_p] def mycb(result, userdata): print result return True input="A large chunk of data." myfunc(input, myfuncFUNCTYPE(mycb), 0) But, is there any way to give a Python object (say a list) as userdata to the callback function? In order to store away the result chunks, I'd like to do e.g.: def mycb(result, userdata): userdata.append(result) userdata=[] But I have no idea how to cast the Python list to a c_void_p, so that it can be used in the call to myfunc. My current workaround is to implement a linked list as a ctypes structure, which is quite cumbersome.

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• SQL Queries for Creating a rollback point and to rollback to that specific point

  - by Santhosha

  Hi, As per my project requirement i want to perform two operation Password Change Unlock Account(Only unlocking account, no password change!) I want return success only if both the transactions succeeds. Say if password change succeeds and unlock fails i cannot send success or failure. So i want to create a rollback point before password change, if both queries executes successfully i will commit the transaction. If one of the query fails i will discard the changes by rolling back to the rollback point. I am doing this in C++ using ADO. Is there any SQL Queries,using i can create the rollback point and reverting to rollback point and commiting the transaction I am using below commands for Password change ALTER LOGIN [username] WITH PASSWORD = N'password' for Unlock account ALTER LOGIN [%s] WITH CHECK_POLICY = OFF ALTER LOGIN [%s] WITH CHECK_POLICY = ON Thanks in advance!! Santhosh

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• Is it possible for parent window to notice if child window has been closed ???

  - by masato-san

  I have parent window (opener) and child (popup) ---------- -------------- | | | | | parent | -----> opens popup | child | | | | | ----------- -------------- Let's say, in parent page, I have js function hello() In order for child to call parent's hello() when the child window is closed and also pass an argument, I can do, window.close(); window.opener.hello(someArgument); This will close the window and also call parent's hello(); But what if I don't want to have the code window.opener.hello() in child page? I mean I want the code to be in parent page only One thing I can think of is: Somewhat parent knows when the child is closed (event listenr??? not sure in js) But in such case how to receive the argument? (i.e. some data back from the child)

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• Random value from Flags enum

  - by Chris Porter

  Say I have a function that accepts an enum decorated with the Flags attribute. If the value of the enum is a combination of more than one of the enum elements how can I extract one of those elements at random? I have the following but it seems there must be a better way. [Flags] enum Colours { Blue = 1, Red = 2, Green = 4 } public static void Main() { var options = Colours.Blue | Colours.Red | Colours.Green; var opts = options.ToString().Split(','); var rand = new Random(); var selected = opts[rand.Next(opts.Length)].Trim(); var myEnum = Enum.Parse(typeof(Colours), selected); Console.WriteLine(myEnum); Console.ReadLine(); }

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• Reduce lines of code

  - by coffeeaddict

  I'm not a JavaScript guru (yet). I am trying to figure out a way to cut down the number of lines below...are there any shortcuts for lets say the if statements? function showDialog(divID) { var dialogDiv = $("#" + divID); var height = 500; var width = 400; var resizable = false; if (dialogDiv.attr("height") != "") { height = parseInt(dialogDiv.attr("height")); } if (dialogDiv.attr("width") != "") { width = parseInt(dialogDiv.attr("width")); } if (dialogDiv.attr("resizable") != "") { resizable = dialogDiv.attr("resizable"); } dialogDiv.dialog ( { resizable: resizable, width: width, height: height, bgiframe: true, modal: true, autoOpen: false, show: 'blind' } ) dialogDiv.dialog("open"); }

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• Chrome error with NO_MODIFICATION_ALLOWED_ERR DOM Exception 7

  - by HP

  I have below code to insert a style into DOM (there is a use case for injecting style into DOM so please don't ask why or say to load the css in .css file). <script type="text/javascript"> window.onload = function() { var bmstyle = document.createElement('style'); bmstyle.setAttribute('type', 'text/css'); var styleStr = "#test-div {background:#FFF;border:2px solid #315300;"; bmstyle.innerHTML = styleStr; document.body.appendChild(bmstyle); } </script> If I run in Firefox, it works fine. But I got this error in Google Chrome: Line bmstyle.innerHTML = styleStr; Uncaught Error: NO_MODIFICATION_ALLOWED_ERR: DOM Exception 7 Does anyone have a fix? Thanks

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• Visual Studio 2012 not building dependent projects

  - by user1438940

  I just upgraded a VS2010 project to VS2012 and am now having a problem where dependent projects are not building on demand. For instance, say I have the following projects in my solution: Library A ConsoleApp 1 Where ConsoleApp 1 references Library A. If I change the signature of a method in a class in Library A and run ConsoleApp 1, there will be a compiler error due to ConsoleApp 1 not seeing my changes because running ConsoleApp 1 did NOT cause Library A to build. If I manually build Library A, then manually build ConsoleApp 1, it works fine. However, I would expect that running ConsoleApp 1 should cause any dependent projects to be rebuilt before launching. Could I have something configured incorrectly? Or is this a bug in VS2012?

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• Using JQuery getJSON method

  - by nav

  Hi, I am attempting to pase a a JSON data using the JQuery getJSON function. The REST query is: http://query.yahooapis.com/v1/public/yql?q=select%20woeid%20from%20geo.places%20where%20text%20%3D%20%22london%22&format=json&jsoncallback=? The script I'm using to parse 'data' to obtain the WOEID value doesnt seem to work below: $.getJSON("http://query.yahooapis.com/v1/public/yql?"+ "q=select%20woeid%20from%20geo.places%20where%20text%20%3D%20%22"+ "london"+ "%22&format=json&jsoncallback=?", function(data){ console.log("json: " + data); var datatmp = data; if(data.results[0]){ var data = filterData(data.results.place[0]); } } ); Can anyone say what I'm doing wrong? link text

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• LINQ-To-SQL and Many-To-Many Relationship Deletions

  - by Jake

  I have a many-to-many relationship between two tables, let's say Friends and Foods. If a friend likes a food I stick a row into the FriendsFoods table, like this: ID Friend Food 1 'Tom' 'Pizza' FriendsFoods has a Primary Key 'ID', and two non-null foreign keys 'Friend' and 'Food' to the 'Friends' and 'Foods' tables, respectively. Now suppose I have a Friend tom .NET object corresponding to 'Tom', and Tom no longer likes pizza (what is wrong with him?) FriendsFoods ff = tom.FriendsFoods.Where(x => x.Food.Name == 'Pizza').Single(); tom.FriendsFoods.Remove(ff); pizza.FriendsFoods.Remove(ff); If I try to SubmitChanges() on the DataContext, I get an exception because it attempts to insert a null into the Friend and Food columns in the FriendsFoods table. I'm sure I can put together some kind of convoluted logic to track changes to the FriendsFoods table, intercept SubmitChanges() calls, etc to try and get this to work the way I want, but is there a nice, clean way to remove a Many-To-Many relationship with LINQ-To-SQL?

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• NSButton argument binding doesn't pass argument?

  - by Jeff

  I have a NSCollectionView with a NSButton in the collection view item. The xib's owner is set to my BatchListViewController and the controller has the method @interface BatchListViewController : NSViewController -(IBAction)another_click; @end I set the binding for target to be: This works fine but I also want to send the underlying model to the another_click method. According to the Apple docs, The objects specified in the argument bindings are passed as parameters to the selector specified in the target binding when the NSButton is clicked. So I set the binding for argument to be: This runs fine if I keep the selector method's signature the same another_click: but if I change it to -(IBAction)another_click:(id)arg; I get the dreaded error: BatchListViewController another_click]: unrecognized selector sent to instance What am I doing wrong? Apple's docs say this is possible but I haven't been able to find an example of this working. Even other SO threads are saying this isn't possible but that can't be right.

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• Creating a dataframe in pandas by multiplying two series together

  - by Aoife

  Say I have two series in pandas, series A and series B. How do I create a dataframe in which all of those values are multiplied together, i.e. with series A down the left hand side and series B along the top. Basically the same concept as this, where series A would be the yellow on the left and series B the yellow along the top, and all the values in between would be filled in by multiplication: http://www.google.co.uk/imgres?imgurl=http://www.vaughns-1-pagers.com/computer/multiplication-tables/times-table-12x12.gif&imgrefurl=http://www.vaughns-1-pagers.com/computer/multiplication-tables.htm&h=533&w=720&sz=58&tbnid=9B8R_kpUloA4NM:&tbnh=90&tbnw=122&zoom=1&usg=__meqZT9kIAMJ5b8BenRzF0l-CUqY=&docid=j9BT8tUCNtg--M&sa=X&ei=bkBpUpOWOI2p0AWYnIHwBQ&ved=0CE0Q9QEwBg Thanks!

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• C Programming: malloc and free within a loop

  - by kouei

  Hi all, I just started out with C and have very little knowledge about performance issues with malloc() and free(). My question is as such: if I were to call malloc() followed by free() in a while-loop that loops for, say, 20 times, would it run slower compared to if I were to call free() outside the loop? I am actually using the first method to allocate memory to a buffer, read a string of variable length in a file, perform some string operation, and then clear the buffer after every iteration. If my method results in a lot of overhead then I'd like to ask for a better way for me to achieve the same results. Sorry for my bad English. Thanks and regards, K

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• How to filter rows in JTable based on boolean valued columns?

  - by vinny

  Im trying to filter rows based on a column say c1 that contains boolean values. I want to show only rows that have 'true' in c1. I looked up the examples in http://java.sun.com/docs/books/tutorial/uiswing/components/table.html#sorting. The example uses a regex filter. Is there any way I can use boolean values to filter rows? Following is the code Im using (borrowed from the example) private void filter(boolean show) { RowFilter<TableModel, Object> filter = null; TableModel model = jTb.getModel(); boolean value = (Boolean) model.getValueAt(0,1); //If current expression doesn't parse, don't update. try { // I need to used 'value' to filter instead of filterText. filter =RowFilter.regexFilter(filterText, 0); } catch (java.util.regex.PatternSyntaxException e) { return; } sorter.setRowFilter(filter); } thank you.

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• Performance Testing Versus Unit Testing

  - by Mystagogue

  I'm reading Osherove's "The Art of Unit Testing," and though I've not yet seen him say anything about performance testing, two thoughts still cross my mind: Performance tests generally can't be unit tests, because performance tests generally need to run for long periods of time. Performance tests generally can't be unit tests, because performance issues too often manifest at an integration or system level (or at least the logic of a single unit test needed to re-create the performance of the integration environment would be too involved to be a unit test). Particularly for the first reason stated above, I doubt it makes sense for performance tests to be handled by a unit testing framework (such as NUnit). My question is: do my findings / leanings correspond with the thoughts of the community?

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• Latent Dirichlet Allocation, pitfalls, tips and programs

  - by Gregg Lind

  I'm experimenting with Latent Dirichlet Allocation for topic disambiguation and assignment, and I'm looking for advice. Which program is the "best", where best is some combination of easiest to use, best prior estimation, fast How do I incorporate my intuitions about topicality. Let's say I think I know that some items in the corpus are really in the same category, like all articles by the same author. Can I add that into the analysis? Any unexpected pitfalls or tips I should know before embarking? I'd prefer is there are R or Python front ends for whatever program, but I expect (and accept) that I'll be dealing with C.

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• Extracting and Parsing data with soapUI

  - by James G

  Hi. So I am in need to learn how to use soapUI pretty quick. I'm finding it pretty tedious to start so I was hoping I might be able to get some help here. Here's what I need to do. Lets say we have Company A and Company B which is a subset of Company B. Now Company A offers a webservice accessible by Company B such that Company B can gather daily aggregated data from Company A's database. Now Company B wants to take this data and publish it on their website. What I'd like is a very basic overview of what I need to do to extract and parse the data onto a website. Just the outline of the process so I can get started. What languages should I be using at what stages and what not. Any help would be highly appreciated.

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• Core Data Relationship List

  - by Dylan Copeland

  I'm not sure whether or not this is the appropriate way of doing this, but I was wondering what's the best way to approach a relationship to a value in a list with Core Data? For example, say you have a 'person' entity. Each person can have a different 'hair color'. I'm trying to basically define the hair colors in my data model and allow the 'person' entity to have a relationship to their given 'hair color. Is this possible? Good idea or bad? Thanks in advance.

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