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  • How can I add an event handler to an event by name?

    - by cyclotis04
    I'm attempting to add an event handler for every control on my form. The form is a simple info box which pops up, and clicking anywhere on it does the same thing (sort of like Outlook's email notifier.) To do this, I've written a recursive method to add a MouseClick handler to each control, as follows: private void AddMouseClickHandler(Control control, MouseEventHandler handler) { control.MouseClick += handler; foreach (Control subControl in control.Controls) AddMouseClickHandler(subControl, handler); } However, if I wanted to add a handler for all of the MouseDown and MouseUp events, I'd have to write two more methods. I'm sure there's a way around this, but I can't find it. I want a method like: private void AddRecursiveHandler(Control control, Event event, EventHandler handler) { control.event += handler; foreach (Control subControl in control.Controls) AddRecursiveHandler(subControl, event, handler); }

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  • Spring+JSP url building best practices

    - by dotsid
    I wonder if there are any good practices for addressing Spring controllers in JSP. Suppose I have controller: @Controller class FooController { // Don't bother about semantic of this query right now @RequestMapping("/search/{applicationId}") public String handleSearch(@PathVariable String applicationId) { [...] } } Of course in JSP I can write: <c:url value="/search/${application.id}" /> But it's very hard to change url then. If you familiar with Rails/Grails then you now how this problem resolved: redirect_to(:controller => 'foo', :action = 'search') But in Spring there is so much UrlMappers. Each UrlMapper have own semantic and binding scheme. Rails alike scheme simply doesn't work (unless you implement it yourself). And my question is: are there any more convenient ways to address controller from JSP in Spring?

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  • Accessing generic lists with delegate notation

    - by n0vic3c0d3r
    I see some people write: //wordList is List<string> wordList.ForEach(delegate(string word){ Console.WriteLine(word);}); instead of: foreach(string word in wordList) { Console.WriteLine(word); } What is the advantage in doing so. Also I couldn't fathom the Action delegate syntax given above though I have used delegates in C# 2.0. Basically I am not able to relate the syntax with the concept of delegates I am familiar with. Can you please help me understand the syntax. Is it some shorthand?

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  • How do I list all cron jobs for all users?

    - by yukondude
    Is there a command or an existing script that will let me view all of a *NIX system's scheduled cron jobs at once? I'd like it to include all of the user crontabs, as well as /etc/crontab, and whatever's in /etc/cron.d. It would also be nice to see the specific commands run by run-parts in /etc/crontab. Ideally, I'd like the output in a nice column form and ordered in some meaningful way. I could then merge these listings from multiple servers to view the overall "schedule of events." I was about to write such a script myself, but if someone's already gone to the trouble...

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  • <= vs < when proving big-o notation

    - by user600197
    We just started learning big-o in class. I understand the general concept that f(x) is big-o of g(x) if there exists two constants c,k such that for all xk |f(x)|<=c|g(x)|. I had a question whether or not it is required that we include the <= to sign or whether it is just sufficient to put the < sign? For example: suppose f(x)=17x+11 and we are to prove that this is O(x^2). Then if we take c=28 and xk=1 we know that 17x+11<=28x^2. So since we know that x will always be greater than 1 this implies that 28x^2 will always be greater than 17x+11. So, do we really need to include the equal sign (<=) or is it okay if we just write (<)? Thanks in advance.

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  • Equivalence Classes LISP

    - by orcik
    I need to write a program for equivalence classes and get this outputs... (equiv '((a b) (a c) (d e) (e f) (c g) (g h))) => ((a b c g h) (d e f)) (equiv '((a b) (c d) (e f) (f g) (a e))) => ((a b e f g) (c d)) Basically, A set is a list in which the order doesn't matter, but elements don't appear more than once. The function should accept a list of pairs (elements which are related according to some equivalence relation), and return a set of equivalence classes without using iteration or assignment statements (e.g. do, set!, etc.). However, set utilities such as set-intersection, set-union and a function which eliminates duplicates in a list and built-in functions union, intersection, and remove-duplicates are allowed. Thanks a lot!

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  • Help with Custom Workflow that checks db

    - by zSysop
    I need to write a workflow that monitors the status of a sql server column/field and does work to some other tables once the column has changed to "Close". (It could wait for days or hours) My application is written in c# .net 3.5. I've done some really simple "hello world" type of apps with windows workflow foundation 3.5 but have not yet grasped how to do go about implementing something like this. Any help with code or articles on this would be extremely useful. Thanks in advance.

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  • Payment Gateways for Mid-Sized Business?

    - by Eric
    My company is a bit unhappy with the support we've been getting from Cybersource and we're about to embark on a billing re-write so we're taking the opportunity to look at other gateways. Anyone have any positive or negative experiences they'd like to share? I'd rather not hear about small website gateways like paypal, we run tens of thousands of transactions and millions a year. If you know, I'd love to hear how much you're paying in transaction/gateway fees too. We're primarily a .NET shop if you'd like to speak to a particular API. Gateway must support the big 4 credit cards (mc, visa, disc, amex) and ACH. Thanks in advance for the help from the hive mind. :)

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  • Know if a Visual Studio Website project is recompiling itself in the background?

    - by jdk
    A number of team members update a central ASP.NET dev site (Website project, not a Web application type). Some kinds of changes cause a recompile/rebuild in it. The large website takes a while to recompile and we've noticed it will still seemingly serve out dynamic pages before everything is internally updated. During the site's "gestation" period, our mileage varies while hitting it. Sometimes we get a correct page, sometimes an compilation error page that will eventually be served up without a compilation error, and at other times an unexpected hybrid. Is it possible to query an ASP.NET website application to see if it's currently compiling or rebuilding itself? If so I would write a status page that the team could reference when they're getting weird behaviour, so they would know to wait. Update: Our team often edit files manually on the dev server. For production we'd make pre-compiled pushes. The dev environment is a little more malleable and ever-changing so I'm looking for a solution to reducing the "confusion" there.

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  • QT4, paginated showing elements

    - by matiit
    I am going to write an application that uses QT4 (with C++ or python it isnt important in that moment). One of functionality is "Showing all items in database". One item has a Title, author, description and photo (constant size) And there could be very many items. Let's say 400. There won't be enough space to show'em all at once time. One row will have 200px, so i need at most 4 for once time. How to paginate them? I have no idea. I can use limit and offset in SQL queries, but how to tell window: "that's 5th page"? Any solutions?

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  • How should I think about perspectives and rotation in OpenGL ES?

    - by Omega
    As I start to write rendering code, how do I want to consider my drawing operations? Will they always be relative to a fixed coordinate system on the screen, or does this change based on the camera perspective? The best example I can try to come up with is say I'm at (0,0,0) and I draw a line to (3,3,3). If I change the perspective +1 on the X axis and conduct the same operation, does it happen at (4,3,3), or am I just getting a new view of the line still being made at (3,3,3)? When doing rotation, am I moving the point from which a frustum emanates, or am I moving the rendering underneath?

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  • What would you like to see in a book about Rails 3?

    - by Ryan Bigg
    Hello, I'm thinking of writing a book about Rails 3 and I have a basic idea of what I want to write about, but really what I need is that little bit of polish from the community. The book is planned to cover: A little bit of Ruby Version control using Git Testing using RSpec & Cucumber Life without Rails (Rack) Developing an application in Rails (vague, I know, sorry! Work in progress) Javascript testing using Selenium Background processing Document databases (a tentative maybe, at this stage) Monitoring an application And a little more. So, I leave this question for you: What do you want to see in a book about Rails 3, which goes from "This is Rails" to "This is how Rails scales"?

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  • Insert new row with data computed from other rows

    - by Tyler McHenry
    Suppose I have a MySQL table called MyTable, that looks like this: +----+------+-------+ | Id | Type | Value | +----+------+-------+ | 0 | A | 1 | | 0 | B | 1 | | 1 | A | 2 | | 1 | B | 3 | | 2 | A | 5 | | 2 | B | 8 | +----+------+-------+ And, for each Id, I want to insert a new row with type C whose Value is the sum of the type A and B values for the rows of the same Id. The primary key on this table is (Id, Type), so there's no question of duplication of Id,Type pairs. I can create the rows I want with this query: SELECT MyTable_A.Id AS Id, 'C' AS Type, (A_Val + B_Val) AS Value FROM (SELECT Id, Value AS A_Val FROM MyTable WHERE Type='A') AS MyTable_A JOIN (SELECT Id, Value AS B_Val FROM MyTable WHERE Type='B') AS MyTable_B ON MyTable_A.Id = MyTable_B.Id Giving: +----+------+-------+ | Id | Type | Value | +----+------+-------+ | 0 | C | 2 | | 1 | C | 5 | | 2 | C | 13 | +----+------+-------+ But the question is: How do I use this result to insert the generated type-C rows into MyTable? Is there a relatively simple way to do this with a query, or do I need to write a stored procedure? And if the latter, guidance would be helpful, as I'm not too well versed in them.

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  • Using JS script for "raining images". Can't seem to hide pre-loaded image

    - by user1813605
    I am trying to hide an image in a script pre-loading on the page. Below script makes images "rain" down the screen onClick. It functions well, but it displays the pre-loaded image itself on the page before the button is clicked. I'm trying to hide the image until the button is pressed. If anyone has any insight on how to hide the image until the function dispenseMittens() runs, I'd be eternally grateful :) Thanks! <script language="javascript"> var pictureSrc = 'mitten.gif'; //the location of the mittens var pictureWidth = 40; //the width of the mittens var pictureHeight = 46; //the height of the mittens var numFlakes = 10; //the number of mittens var downSpeed = 0.01; var lrFlakes = 10; var EmergencyMittens = false; //safety checks. Browsers will hang if this is wrong. If other values are wrong there will just be errors if( typeof( numFlakes ) != 'number' || Math.round( numFlakes ) != numFlakes || numFlakes < 1 ) { numFlakes = 10; } //draw the snowflakes for( var x = 0; x < numFlakes; x++ ) { if( document.layers ) { //releave NS4 bug document.write('<layer id="snFlkDiv'+x+'"><img src="'+pictureSrc+'" height="'+pictureHeight+'" width="'+pictureWidth+'" alt="*" border="0"></layer>'); } else { document.write('<div style="position:absolute;" id="snFlkDiv'+x+'"><img src="'+pictureSrc+'" height="'+pictureHeight+'" width="'+pictureWidth+'" alt="*" border="0"></div>'); } } //calculate initial positions (in portions of browser window size) var xcoords = new Array(), ycoords = new Array(), snFlkTemp; for( var x = 0; x < numFlakes; x++ ) { xcoords[x] = ( x + 1 ) / ( numFlakes + 1 ); do { snFlkTemp = Math.round( ( numFlakes - 1 ) * Math.random() ); } while( typeof( ycoords[snFlkTemp] ) == 'number' ); ycoords[snFlkTemp] = x / numFlakes; } //now animate function mittensFall() { if( !getRefToDivNest('snFlkDiv0') ) { return; } var scrWidth = 0, scrHeight = 0, scrollHeight = 0, scrollWidth = 0; //find screen settings for all variations. doing this every time allows for resizing and scrolling if( typeof( window.innerWidth ) == 'number' ) { scrWidth = window.innerWidth; scrHeight = window.innerHeight; } else { if( document.documentElement && ( document.documentElement.clientWidth || document.documentElement.clientHeight ) ) { scrWidth = document.documentElement.clientWidth; scrHeight = document.documentElement.clientHeight; } else { if( document.body && ( document.body.clientWidth || document.body.clientHeight ) ) { scrWidth = document.body.clientWidth; scrHeight = document.body.clientHeight; } } } if( typeof( window.pageYOffset ) == 'number' ) { scrollHeight = pageYOffset; scrollWidth = pageXOffset; } else { if( document.body && ( document.body.scrollLeft || document.body.scrollTop ) ) { scrollHeight = document.body.scrollTop; scrollWidth = document.body.scrollLeft; } else { if( document.documentElement && ( document.documentElement.scrollLeft || document.documentElement.scrollTop ) ) { scrollHeight = document.documentElement.scrollTop; scrollWidth = document.documentElement.scrollLeft; } } } //move the snowflakes to their new position for( var x = 0; x < numFlakes; x++ ) { if( ycoords[x] * scrHeight > scrHeight - pictureHeight ) { ycoords[x] = 0; } var divRef = getRefToDivNest('snFlkDiv'+x); if( !divRef ) { return; } if( divRef.style ) { divRef = divRef.style; } var oPix = document.childNodes ? 'px' : 0; divRef.top = ( Math.round( ycoords[x] * scrHeight ) + scrollHeight ) + oPix; divRef.left = ( Math.round( ( ( xcoords[x] * scrWidth ) - ( pictureWidth / 2 ) ) + ( ( scrWidth / ( ( numFlakes + 1 ) * 4 ) ) * ( Math.sin( lrFlakes * ycoords[x] ) - Math.sin( 3 * lrFlakes * ycoords[x] ) ) ) ) + scrollWidth ) + oPix; ycoords[x] += downSpeed; } } //DHTML handlers function getRefToDivNest(divName) { if( document.layers ) { return document.layers[divName]; } //NS4 if( document[divName] ) { return document[divName]; } //NS4 also if( document.getElementById ) { return document.getElementById(divName); } //DOM (IE5+, NS6+, Mozilla0.9+, Opera) if( document.all ) { return document.all[divName]; } //Proprietary DOM - IE4 return false; } function dispenseMittens() { if (EmergencyMittens) { window.clearInterval(EmergencyMittens); } else { EmergencyMittens = window.setInterval('mittensFall();',100); } } </script>

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  • copy C'tor with operator= | C++

    - by user2266935
    I've got this code here: class DerivedClass : public BaseClass { SomeClass* a1; Someclass* a2; public: //constructors go here ~DerivedClass() { delete a1; delete a2;} // other functions go here .... }; My first question is as follows: Can I write an "operator=" to "DerivedClass" ? (if your answer is yes, could you show me how?) My second question is: If the answer to the above is yes, could you show me how to make an "copy c'tor" using the "operator=" that you wrote beforehand (if that is even possible)? Your help would be much appreciated !

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  • Fastest way to convert file from latin1 to utf-8 in python.

    - by xsaero00
    I need fastest way to convert files from latin1 to utf-8 in python. The files are large ~ 2G. ( I am moving DB data ). So far I have import codecs infile = codecs.open(tmpfile, 'r', encoding='latin1') outfile = codecs.open(tmpfile1, 'w', encoding='utf-8') for line in infile: outfile.write(line) infile.close() outfile.close() but it is still slow. The conversion takes one fourth of the whole migration time. I could also use a linux command line utility if it is faster than native python code.

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  • C# How to place a comma after each word but the last in the list

    - by user576712
    I totally new to C# and learning as I go. I am stuck on issue which I'm hoping an experienced programmer can help. I have added a CheckedListBox to my form and added a collection of 6 items to it. I need all but the last item selected to have a comma placed beside it, so my question is: how can I tell C# NOT to place a comma beside the last item selected? foreach (object itemChecked in RolesCheckedListBox.CheckedItems) { sw.Write(itemChecked.ToString() + ","); } Thanks for any help received! Dan

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  • Cannot debug tests using Resharper

    - by Mike
    Hi, I'm not able to debug my tests using Resharper-Debug option in my project. I have seen this issue raised by lots of people, but has't come across a solid suggestion which solves my issue. The strange thing is that, if I create a sample project and write a simple unit test, I'm able to debug it without any issues.However when I try to do this in my current project, it simply throws a dialog box saying "Cannot Launch Debugger".I have checked this with my peers, and they does't face this issue :( Also I don't have any issues while running the test. It's an XP machine and following is the version of resharper: JetBrains ReSharper 5.1 C# Edition Build 5.1.1753.4 on 2010-10-15T15:51:30 Licensed to: XXXXXXX Plugins: none. Visual Studio 9.0.21022.8. Copyright © 2003–2011 JetBrains s.r.o.. All rights reserved. Thanks, -M

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  • css not:first-child selector

    - by OTARIKI
    I have div tag and him is several ul tags. If I trying set css properties only for first ul tag, this code works: div ul:first-child { background-color: #900; } But when i want set css properties each ul tags, except first, I trying this: div ul:not:first-child { background-color: #900; } also this div ul:not(:first-child) { background-color: #900; } and this div ul:first-child:after { background-color: #900; } But effect none. Someone tell please, how must write in css: "each element, except first" ?

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  • Best Ruby ORM for Wrapping around Legacy MSSQL Database?

    - by Technocrat
    Hi. I found this answer and it sounds like almost exactly what I'm doing. I have heard mixed answers about whether or not datamapper can support mssql through dataobjects. Basically, we have an app that uses a consistently structured database, consistently named tables, etc in MSSQL. We're making all kinds of tools and stuff that have to interact with it, some of them remotely and so I decided that we need to create some common, simple access point to do read/write operations on the MSSQL app since it's API is all C# and other things I despise. Now my question is if anyone has any examples or projects they know of where a ruby ORM can essentially create models for another application's legacy database by defining the conventions of each model's pkeys, fkeys, table names, etc. Sequel is the only ORM I've used with MSSQL but never to do anything quite like this. Any suggestions?

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  • Efficient way to organise data file in columns with Python

    - by user1700959
    I'm getting an output data file of a program which looks like this, with more than one line for each time step: 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 7.9819E-06 1.7724E-02 2.3383E-02 3.0048E-02 3.8603E-02 4.9581E-02 5.6635E-02 4.9991E-02 3.9052E-02 3.0399E-02 .... I want to arrange it in ten columns I have made a Python script, using regular expressions to delete \n in the proper lines, but I think that there should be a simpler more elegant way to do it, here is my script: import re with open('inputfile', encoding='utf-8') as file1: datai=file1.read() dataf=re.sub(r'(?P<nomb>( \d\.\d\d\d\dE.\d\d){8})\n','\g<nomb>',datai) with open('result.txt',mode='w',encoding='utf-8') as resultfile: resultfile.write(datof) Thanks in advance

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  • JQuery Ajax Always Fires Error Function

    - by CccTrash
    AddFileToDB.ashx: public void ProcessRequest (HttpContext context) { context.Response.ContentType = "application/json"; context.Response.Write("{ \"filename\": \"test.jpg\" }"); } JQuery: $.ajax({ url: 'AddFileToDB.ashx', dataType: 'json', success: function(data) { alert(data.filename); }, error: function(data) { alert('error'); }, }); This always results in the error function being called. I don't know why? Thoughts? AddFileToDB.ashx gets fired, but success never gets run.

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  • How do you mentally handle going from writing managed to non-managed code?

    - by Glenn Sandoval
    ~80% of the code I write is in C#. The other ~20% is in C++. Whenever I have to switch from C# to C++, it takes me quite a while to mentally "shift gears" to thinking in C++. I make simple mistakes using pointers and memory allocation that I would not have made when I was in university. Is this normal? Does anyone else experience something similar and if so, what do you do to cut down on the time this wastes?

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  • saving dataset in excel and allow user to download it in the client machine.

    - by Jebli
    Hi, I am developing an application where i want i am displaying a dataset in the datagrid view for the user.Now the user wants to download the data in the datagridview in an excel format.How can i do it ? 1) should i write the dataset in the excel and save it the server before the user download the file ? 2) Can i use a hyper link and set the path of the file that is saved in the server to the hyper link hRef property , so that the user can click and download the file ? I am using C# ASP.net 2.0 Please help !

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  • .NET platform independant sync framework

    - by Quandary
    Question: I need to synchronize a few ActionScript files from my computer to a network share (backup). I saw a quick fix would be using Microsoft Sync Framework for this, and write a windows service. My problem is I also use Linux, and before I start with MS vendor lockin, is there any sync framework/library/whatever I could use that works accross platform? Or does the MS sync framework work on Linux, too? It is my understanding that it is a wrapper around some com objects, thus it wouldn't work. All I need is synchronizing files. So never mind the database part, although it would be nice to have it, too.

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