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• Using Dijkstra's algorithm with negative edges?

  - by Riddler

  Most books explain the reason the algorithm doesn't work with negative edges as nodes are deleted from the priority queue after the node is arrived at since the algorithm assumes the shortest distance has been found. However since negative edges can reduce the distance, a future shorter distance might be found; but since the node is deleted it cannot be updated. Wouldn't an obvious solution to this be to not delete the node? Why not keep the node in the queue, so if a future shorter distance is found, it can be updated? If I am misunderstanding the problem, what is preventing the algorithm from being used with negative edges?

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• Test wordpress sites for SQL Injection on siteurl

  - by Scott B

  I have a client who's wordpress sites have gotten hacked twice by iframe scammers. Each time they've injected iframe code into the content of the sites. This last time, today, they simply changed the siteurl in wp_options to their iframe code. The result was obvious and appeared to simply botch the paths of the scripts that rely on I can't determine if its a password compromise (on FTP or WordPress itself) or a SQL injection to alter siteurl. Since the only thing that was altered is siteurl, I'm thinking perhaps SQL Injection. What are your thoughts? Any way to scan a site for potential SQL injection vulnerabilities? The only active plugins on the site are contact form 7 and google xml sitemaps.

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• Error in Mono Compiler: Files in libraries or multiple-file applications must begin with a namespace

  - by leon

  I am trying to compile this example in mono on ubuntu. However I get the error wingsit@wingsit-laptop:~/MyFS/kitty$ fsc.exe -o kitty.exe kittyAst.fs kittyParser.fs kittyLexer.fs main.fs Microsoft (R) F# 2.0 Compiler build 2.0.0.0 Copyright (c) Microsoft Corporation. All Rights Reserved. /home/wingsit/MyFS/kitty/kittyAst.fs(1,1): error FS0222: Files in libraries or multiple-file applications must begin with a namespace or module declaration, e.g. 'namespace SomeNamespace.SubNamespace' or 'module SomeNamespace.SomeModule' /home/wingsit/MyFS/kitty/kittyParser.fs(2,1): error FS0222: Files in libraries or multiple-file applications must begin with a namespace or module declaration, e.g. 'namespace SomeNamespace.SubNamespace' or 'module SomeNamespace.SomeModule' /home/wingsit/MyFS/kitty/kittyLexer.fsl(2,1): error FS0222: Files in libraries or multiple-file applications must begin with a namespace or module declaration, e.g. 'namespace SomeNamespace.SubNamespace' or 'module SomeNamespace.SomeModule' wingsit@wingsit-laptop:~/MyFS/kitty$ I am a newbie in F#. Is there something obvious I miss?

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• Replacement background image not showing when using GreaseMonkey

  - by Dave C

  I'm trying to use GreaseMonkey to replace the background image of a DIV on bing.com. It's a pretty straightforward call to GM_addstyle: GM_addStyle(".sw_logo " +"{background:url('http://www.kpao.org/blog/kpao-bing-logo-inverse.png') " +"no-repeat 21px 7px transparent}"); However, the image doesn't show up. It's clearly visible in Firebug, and as I twiddle with the CSS in Firebug, I can get it to show up. But it doesn't stay. Any thoughts on why? Maybe it's a bug, but then maybe I'm missing something obvious. Thanks!

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• Activator.CreateInstance fails in Windows Service

  - by kbe

  I have an issue with a Windows Service which throws a NullReference exception whenever I try to use var myType = Activator.CreateInstance(typeof(MyType)) There is no problem whenever I run the exact same code in a console window - and after debugging the obvious "which user is running this code" I doubt that it is a mere fact of changing the user running the service as I've tried to run the service using the computer's Administrator account as well as LocalSystem. I'm suspecting a Windows Update fiddling with default user rights but that's a bit of a desperate guess I feel. Remember: The type and assembly exist and works fine - otherwise I wouldn't be able to run the code in a console window. It is only when running in the context of a Windows Service I get an error. The question is: Can I in any way impersonate i.e. LocalSystem in a unittest by creating a GenericPrincipal (how would that GenericPrincipal look)?

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• CSS Padding Issue w/ submit button

  - by Thomas

  This is a dumb problem but I can't seem to set the padding on a submit button properly. No matter what I input for padding, the width and height of the button never changes. Here is the css: .green_submit { color: #fff; background-color: #94c909; border-right: 1px solid #6d9307; border-bottom: 1px solid #6d9307; border-left: none; border-top: none; padding: 25px; } And the HTML: <input type="submit" class='green_submit' value="Validate" /> Any obvious problems here? How can I manipulate the padding on a submit button?

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• Is it possible to alter a marked field´s field function with Word 2007 VBA?

  - by Richard

  Hi, i want do the following: In Word 2007 place the Cursor on a field (or mark that field) and call a macro wich edit the field function of that field. (add some string). I´m even grateful for some tipps what term to google. I used the macro recorder and got following: WordBasic.FormatField Field:="CITATION Gro05 \p 9 \l 1031" Thats obvious creats a new field but where to go from here? To get the selected field i thought about something like this: If Selection.Type = WdFieldType Then ... I hope someone give me some hints :) Bye Richard

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• Hudson build defaults

  - by toluju

  This has been a fairly long-standing problem for us with our Hudson installation, and searching around the Hudson Wiki / Issue Tracker hasn't yielded any insight to this. The question: Is it possible to set certain default values for a maven2 build in Hudson? For example, we want all our projects to run the "clean" goal before a build, we want all our builds to poll the SCM hourly, and we want all our builds to deploy to our maven repository on build success. Right now, we have to manually set these setting for every project individually, which can be rather time consuming as we have 30+ different projects all being managed by Hudson. This is especially annoying if we need to change a particular setting that will affect all projects (e.g. change the repository URL). Given that I couldn't find any mention of this on the Wiki or Issue Tracker leads me to believe that I'm missing something obvious, but I cannot find an answer on my own.

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• How to enforce remote gnupg signing of Mercurial repository only when new tags are created?

  - by Tim Post

  I know how to configure the Mercurial signing extension. The problem that I'm having is that I don't want to sign each individual change set, I only want to sign revisions that introduce new version tags. That's easily accomplished locally, however I can't come up with a way to enforce this on the remote server. I'd like people to continue to be able to push their changes as normal, unless adding a release tag, which should be accompanied by a signature. The end result should be that anyone cloning our repository can easily see a list of signed revisions, which point to a list of signed releases. Hopefully, I've just missed something obvious in hooklib. Has anyone else accomplished this, if so, how?

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• Getting websites to detect our mobile browser

  - by Chromatix

  I've been asked to find out a sensible way to make the majority of popular websites detect our browser - which is functionally complete, but is running on rather constrained hardware - as a "mobile" browser. The idea is that the heaviest popular websites seem to have mobile versions, which render much faster and fit better on the screen. I've looked at the inverse question, which tells me that there isn't an obvious standard way of doing it - http://www.brainhandles.com/techno-thoughts/detecting-mobile-browsers is a case in point. This is borne out by looking at a variety of User-Agent strings from popular mobile and desktop browsers. So far the best idea we can come up with is to add "Mobile" to the string somewhere, since this is the main visible difference between Safari for iPad/iPhone and for Windows/Mac. Does anyone have a better idea?

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• Does MSDeploy support website and database upgrades?

  - by Samuel Jack

  I've just been reading about MSDeploy, the new website deployment tool from Microsoft. I'm developing an installer for a webapplication and a webservice to be used for our off-the-shelf product. I have a couple of questions that I couldn't find obvious answers to. Does MSDeploy have robust support for upgrading websites after the initial deployment? I can see MSDeploy has good support for the initial deployment of databases. But does it have support for upgrading schemas whilst preserving the current data? Links addressing these specific questions would be good.

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• C# - Do you use "var"?

  - by Paul Stovell

  C# 3.0 introduces implicitly typed variables, aka the "var" keyword. var daysInAWeek = 7; var paul = FindPerson("Paul"); var result = null as IPerson; Others have asked about what it does or what the problems with it are: http://stackoverflow.com/questions/527685/anonymous-types-vs-local-variables-when-should-one-be-used http://stackoverflow.com/questions/209199/whats-the-point-of-the-var-keyword http://stackoverflow.com/questions/41479/use-of-var-keyword-in-c I am interested in some numbers - do you use it? If so, how do you use it? I never use var (and I never use anonymous types) I only use var for anonymous types I only use var where the type is obvious I use var all the time!

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• What is the email limit on Google Apps Script?

  - by jmvidal

  Can someone tell me if there is a webpage that lists the official Google limit on emails sent from a Google Apps Script? In testing my little script I got a Service invoked too many times: email (# 59) and now I can't send any more emails. The obvious place for this information would be in the MailApp.sendEmail documentation. But, that does not say anything about a limit. I found this discussion on the google forum from 2/11/10 where users discuss about a 100 or 500 emails/day limit, with a 24 hour ban, but no one from Google provided an official answer. Note that this is for google apps script, which is different from the google app engine, which does have well published limits.

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• TableView - iVar reset when returning from details view

  - by iFloh

  Hi, anyone knows what I need to do to retain my TableView iVars whilst pushing a details view onto the navigation stack? I have an array and a date defined as iVars and the array is retained, whilst the date is not. I checked whether there may be an autorelease hidden somewhere but there are no obvious ones. The properties are defined as nonatomic, retain. I use custom NSDate category methods to determine specific dates at stages. These use NSDateComponents, NSRange and NSCalendar, for example: - (NSDate *)lastDayOfMonth: { NSCalendar *tmpCal = [NSCalendar currentCalendar]; NSDateComponents *tmpDateComponents = [tmpCal components:NSYearCalendarUnit | NSMonthCalendarUnit | NSEraCalendarUnit | NSWeekCalendarUnit | NSWeekdayOrdinalCalendarUnit fromDate:self]; NSRange tmpRange = [tmpCal rangeOfUnit:NSDayCalendarUnit inUnit:NSMonthCalendarUnit forDate:[tmpCal dateFromComponents:tmpDateComponents]]; [tmpDateComponents setDay:tmpRange.length]; [tmpDateComponents setHour:23]; [tmpDateComponents setMinute:59]; [tmpDateComponents setSecond:59]; return [[NSCalendar currentCalendar] dateFromComponents:tmpDateComponents]; } could they somehow be the reason?

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• firefox: getting access to the list of tabs/windows to restore on startup

  - by robb

  Sometimes ffox fails to restore the previously open tabs/windows. This might be happening when some of the urls to be opened are no longer reachable (e.g. behind a vpn) or after the underlying OS (Windows) has been forcibly restarted (e.g. to complete an automated patch installation). Anyway, after restarting, can this list of urls be recovered somehow? Say for example, I was daft enough to have clicked on "start new session". Can I still get access to the old list of open urls? There is the browser history of course, but it contains a lot of stuff - the urls that were open when ffox last exited are not obvious. It would be neat if they were marked in some way - tagged for example. .robb

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• What needs checking in for a Grails app?

  - by Bill James

  What parts of a Grails application need to be stored in source-control? Some obvious parts that are needed: grails-app directory test directory web-app directory Now we reach questions like: If we use a Grails plug-in (like gldapo), do we need to check in that plugin? Do Grails plugins install in the Grails directory, or your project? I'm not looking to start a religious war about .project, so please ignore that, but are there any "hidden" project files I need to worry about, along with the plugin issues? Converted to a community wiki, as new versions of Grails have changed some of these solutions, especially as regards plugins.

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• T-SQL out of order insert

  - by tearman

  Basically I have a User-Defined Table Type (for use as a table-valued variable) which I'm referencing in a stored procedure that effectively just calls two other stored procedures, then inserts those values into the table type. Id est INSERT INTO @tableValuedVariable (var1, var2, var3, var4, var5) EXEC [dbo].StoredProcedure1; INSERT INTO @tableValuedVariable (var1, var2, var5) EXEC [dbo].StoredProcedure2; You can probably already tell what I'm going to ask. Basically StoredProcedure2 only returns a few of the values the table is set to hold, and I'd like those other variables to just be null (as defined as default). Only SQL is complaining that I'm not specifying all the variables available to that table. The return datasets can be quite sizable so I'd like to avoid loops and such for obvious reasons. Thanks for any help.

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• Jquery selectors by CSS class in IE is really slow--workarounds?

  - by Sam Lee

  I have a web app where I have several elements with class="classA". I want to select and apply a function to all of them. I am doing the obvious thing, which is $(".classA").each(function () { ... }). This works just fine in Chrome/Safari/Firefox but is really slow in IE. It turns out IE has serious performance issues when selecting things by CSS class in jQuery. I was wondering if anyone has suggestions on good ways to deal with this. I can't use ID selectors because there can be multiple DOM elements I want to select.

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• How do i supress keypress being printed to console in .NET?

  - by cbsch

  Hello, I'm porting a small C++ console game to C# and it seems that I can't stop key presses from being printed to the console. In C++ I get the keystroke with this method, which also suppress the keystrokes from being printed to the console: bool Game::getInput(char *c) { if (_kbhit()) { *c = _getch(); return true; } return false; } I tried to do the equivalent in C# by doing: Key = Console.ReadKey(); But this does not suppress the character from being printed to the console, causing obvious problems. Any ideas on how to remedy this?

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• quick mysql query problem

  - by Haroldo

  sorry, i dont like to ask such instance specific questions but this is driving me MENTAL! there's gotta be something obvious i'm missing: table: |ven_name|varchar(150)|No| |ven_sd|varchar(90)|Yes|NULL |ven_details|varchar(3000)|Yes|NULL |ven_tel|varchar(30)|Yes|NULL |ven_email|varchar(50)|Yes|NULL |ven_address|varchar(300)|Yes|NULL |lat|decimal(9,6)|Yes|NULL |long|decimal(9,6)|Yes|NULL |pub|tinyint(4)|Yes|NULL |bar|tinyint(4)|Yes|NULL |club|tinyint(4)|Yes|NULL |img_added|tinyint(4)|Yes|NULL query: INSERT INTO ven (img_added, ven_name, ven_sd, ven_tel, ven_email, ven_address, lat, long, pub, ven_details) VALUES (1, 'aaa', 'aaa', 'aaa', 'aaa', 'aaa', 100, 156, 1, 'aaa') error: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'long, pub, ven_details) VALUES(1, 'aaa', 'aaa', '0117 9246449', 'aaa', 'aaa', 10' at line 1

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• Java webapp: where/how to automatically set each picture's width/height

  - by NoozNooz42

  For several reasons, a lot of "webmaster guides" (like Google and Yahoo!'s webmaster guides/guidelines) repeats several times that it is better to always put the width and height attribute of the img tag. One of the most obvious reason is that the elements in the page won't seem to be "jumping around" to a new location after every picture is loaded (always setting the correct width/height sure gets rid of this behavior). And there are other reasons to follow these guidelines / best practices. So: if we consider that these are indeed good practices if there are a lot of pictures and they are changing often if pictures aren't changing between two .war re-deploy (that is: there's no user-contributed picture) if we don't want to manually edit all these width/height attributes How do we automatically/programmatically serve HTML pages where every img tag have their width/height attribute correctly set as the best practice recommend?

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• newbie: Rails on remote Apache server not displaying index.html.erb

  - by paracaudex

  I played around with Rails on my laptop (running Linux + Apache + MySQL) and had no trouble getting the Getting Started with Rails tutorial to work locally. Now I'm trying the same thing at work on a remote Mac OS X + Apache server, and things aren't quite so rosy. I typed rails blog -d mysql to create a directory called blog in /Library/WebServer/Documents/mydirectory. The trouble is, if I go to server.com/mydirectory/public, I get the public/index.html in my browser. But, I don't get this file if I go to server.com/mydirectory/. Instead, I get a 403 error. Also, when I: script/generate controller home index to create: app/views/home/index.html.erb I am unable to view this file, whether I go to server.com/mydirectory/home/index, or if I add a new line (map.root :controller => "home") to config/routes.rb and go to server.com/mydirectory. Am I missing something really obvious about Apache and Rails?

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• Two '==' equality operators in same 'if' condition are not working as intended.

  - by Manav MN

  I am trying to establish equality of three equal variables, but the following code is not printing the obvious true answer which it should print. Can someone explain, how the compiler is parsing the given if condition internally? #include<stdio.h> int main() { int i = 123, j = 123, k = 123; if ( i == j == k) printf("Equal\n"); else printf("NOT Equal\n"); return 0; } Output: manav@workstation:~$ gcc -Wall -pedantic calc.c calc.c: In function ‘main’: calc.c:5: warning: suggest parentheses around comparison in operand of ‘==’ manav@workstation:~$ ./a.out NOT Equal manav@workstation:~$ EDIT: Going by the answers given below, is the following statement okay to check above equality? if ( (i==j) == (j==k))

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• How should I compensate for a bad WSDL?

  - by Brabster

  I've come across several examples of SOAP-based web services where automated tooling fails to build a client that works. Investigating these examples leads me to believe that the WSDL the service uses to describe itself doesn't quite match the service that's being provided. Maybe a wrong type somewhere, a different data structure - something. I'm unsure what the most appropriate response is - if we assume that the obvious one (get the provider to fix their stuff) isn't available. Some options I can think of: Make a fixed WSDL? Hack the generated code? Any other options? No good options? What good experiences have people had? What works in a real environment? Thanks

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• How do I layout an image that will be dynamically sized in interface builder?

  - by Tony

  I am having trouble laying out scrollable view in interface builder. A screen shot of my layout is here. As you can see the layout is pretty simple. The UIImageView above the text will not have a specific height. It may be 100px high or 300px high. This is why the view is scrollable. I am experiencing two problems with this layout: 1) For some reason the image will sit behind the text instead of pushing it down. Take a look here. 2) The obvious other problem is that the upper most UIImage and UILabel are getting pushed up off of the screen. I am thinking this has to do with the UIScrollView but I haven't been able to figure out why. Thanks!

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