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• tool for adding parentheses to equations?

  - by jedierikb

  Is there an online tool for adding parentheses to simple math equations? For example, a + b * c into a + (b * c) Those who paid more attention in math class might be able to tackle order of operations for huge equations in their head, but I could often use some help (and verification of my thinking). I often encounter other people's libraries having equations and functions I need for my code, and this would be kind of helpful for debugging and understanding. I was hoping Wolfram Alpha would do this, but the output is not easy to plug back into most programming languages e.g. a + (bc)

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• Restrict folder sharing over cygwin sshd

  - by mtanish

  I recently installed a SSH server on my Windows 7 PC and created a separate user account for this. When i logged in using SSH, i could access all the windows directories. /cygdrive/c /cygdrive/d /cygdrive/e How do i prevent this user from accessing all the win directories other than its home directory under cygwin /home/chuck/ ? Preferably i do not want the user to even view /cygdrive when the user types "mount". Is there a easy way to do this? I want to later allow remote users to log on to this machine and avoid messing up other things.I know i can setup a separate machine but this is a plan for later.

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• Ruby Equivalent of Python Requests Library (HTTP Client)

  - by Hartator

  There is a library in python that I love called requests. requests is a http client build on urllib3, top-notch :) (http://docs.python-requests.org/en/latest/) I am looking for something similar in ruby, basically what I need is : Upload files support (multipart/form-data) Easy get/post Cookies can be passed from a response object to a request object (build manually login script) Stable and Flexible Sessions support (to not have to handle cookies manually if we don't have too) I've looked at Typhoeus, but the code example in the home page doesn't work (they have moved code along and the get method is not longer directly accessible like that), so it's not starting well! :) Curb seems nice and I like curl, there is alson RestClient which seems popular and em-http seems pretty fast according to benchmark. There is a aso Patron and CurlFu which I haven't have the time to try. And of course Net:Http. But it doesn't seems to have a main stream solution that everyone point. I think a lot of people have been in my situation and I wonder what they have choosen and why?

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• Data logged to a file; how do I rotate logs and how do I parse the data to not have 'gaps' in the da

  - by phidah

  I've got a web application that, for performance reasons, throws any data sent into a logfile. I've got two concerns with this approach: How do I best rotate logs, in order to not lose data? For each user session multiple requests are logged. Each request has a unique id so there is an easy way for me to tie the requests to the session. The problem is, however, that if I rotate the logs I risk ending up with one request in one log and another request in another log. How do I arrange my parsing in a way that allows me to parse all requests from a given session? I am willing to define a session timelimit, for example that the requests must, at maximum be 30 minutes apart. If I had a hourly log rotation at 00 minutes: What if the user made one request at 13:59 and one at 14:01 - The user would end up having requests in two different logs.

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• C#: Access 32-bit/64-bit DLL depending on platform

  - by Thorsten Dittmar

  Hi, we use a self-written 32bit C++ DLL from our C# applications. Now we've noticed that when the C# applications are run on a 64bit system, the 64bit runtime is automatically used and of course the 32bit DLL can not be accessed from the 64bit runtime. My question is: is there a way of using the 32bit DLL? If not, if I created a 64bit version of the DLL, would it be easily possible to let the application choose which one to P/Invoke to? I'm thinking of creating two helper classes in C#: One that imports the functions from the 32bit DLL and one that imports from the 64bit DLL, then creating a wrapper class with one function for each imported function that calls either the 32bit importer or the 64bit importer depending on the "bittyness" of the OS. Would that work? Or is there another easy way to do things?

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• Of Datagridviews, databinding, and non validating cell values.

  - by Yanko Hernández Alvarez

  Lets simplify. Lets say I have this class: class T { public string Name { get; set; } public int Age { get; set; } public int height{ get; set; } ... } and I have a DataGridView's DataSource bound to a BindingList <T>, with N columns, each one bound to each property. I need to: Allow the user to enter non validating ages, heights, etc (for instance "aaa") Color the cells with non validating values (red background) Retain the non validating values displayed until the form is closed (I don't want to lose the values entered until the form is closed, so the user has the option to correct the bad cells anytime he wants BEFORE closing the form) Keep the last correct values entered for each cell with non validating values entered. When the form is closed, ditch the non validating values and keep the last correct values entered. Is there any easy way to do this?

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• WPF Window Inheritance

  - by Jonathan Sternberg

  I have an application that will run in two modes, each with very similar displays. The application is supposed to allow easy modification of a user interface. One of the features is that it has to display the user interface. Both of these windows look the same, just one has more menus than the other. I'd like to just create a base template (the user visual) and then inherit it for the editor. That way if one interface changes, both of them change. But this doesn't seem to be possible using WPF. I try to inherit and I get warnings about hiding members. I also don't see how I'm going to append new menus to the base template. Is what I'm trying to do possible? Is there a better way that I'm supposed to be doing this? It seems like I'm fighting the way that they want me to make the application.

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• Developing ebooks- software?

  - by Mark Mayo

  I've written a few documents for friends or blogs on software testing, job hunting and android development. I've been toying with the idea of producing some programming-related ebooks. However, developing these in Word or OpenOffice seems too amateurish compared to some of the fantastically produced books out there. I'm proficient in LaTeX but have never seen it used to produce ... 'marketable' works - just technical papers, maths, etc - which is great for code but not for distribution. Has anyone seen any good (preferably free / open source) tool or software for developing/compiling professional-looking marketable ebooks (probably to .pdf or .exe format - but I can take care of that part if need be)? And more importantly, ones that are easy to use to format any code samples or snippets that I may choose to include. Much appreciated.

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• Estimate serialization size of objects?

  - by Stefan K.

  In my thesis, I woud like to enhance messaging in a cluster. It's important to log runtime information about how big a message is (should I prefer processing local or remote). I could just find frameoworks about estimating the object memory size based on java instrumentation. I've tested classmexer, which didn't come close to the serialization size and sourceforge SizeOf. In a small testcase, SizeOf was around 10% wrong and 10x faster than serialization. (Still transient breaks the estimation completely and since e.g. ArrayList is transient but is serialized as an Array, it's not easy to patch SizeOf. But I could live with that) On the other hand, 10x faster with 10% error doesn't seem very good. Any ideas how I could do better?

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• Eclipse and Cassandra

  - by H2oNinja

  I've searched various websites for instructions on how to link 'Cassandra' and 'Eclipse' and followed directions to the last detail in several sites. For some reason, while using Git Bash, I cant get through the 'ant build', via instruction in said mentioned locations across the web. In some location's its easy, just make sure you have; 1. Apache Cassandra source 2. Apache Ant 3. Git So, yeah I've downloaded all the above, tried the same directory, different directories, etc., although still unable to get past the middle step of 'ant build'. Here are a few websites I've used to muddle through setting up the Src code for both utilities, 'Eclipse' and 'Cassandra'. http://uisurumadushanka89.blogspot.com/2012/02/apache-cassandra-how-to-setup-source.html and http://wiki.apache.org/cassandra/RunningCassandraInEclipse both resulting in an immediate halt at the 'ant build'. any insights are information is greatly appreciated. Thank-you, Ryan

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• moqing static method call to c# library class

  - by Joe

  This seems like an easy enough issue but I can't seem to find the keywords to effect my searches. I'm trying to unit test by mocking out all objects within this method call. I am able to do so to all of my own creations except for this one: public void MyFunc(MyVarClass myVar) { Image picture; ... picture = Image.FromStream(new MemoryStream(myVar.ImageStream)); ... } FromStream is a static call from the Image class (part of c#). So how can I refactor my code to mock this out because I really don't want to provide a image stream to the unit test.

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• goo.gl Api: How to know if URL was added to user's history?

  - by Manuel

  I'm using the goo.gl API as described here. It's easy to use and it works with or without authantication (I'm using OAuth). So, if I provide the OAuth token / secret, the shortened URL is added to the users history. My problem is, that I would like to show to the user that the shortened URL was added to his goo.gl history. The respone you get from the shortening request, however, is always the same, whether you use authorization or not: { "kind": "urlshortener#url", "id": "http://goo.gl/fbsS", "longUrl": "http://www.google.com/" } So, does anyone know a way to find out, if the shortened URL was successfully added to the user's history? Is there a parameter you can add to the request URL that leads to a more detailed result string?

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• Want to bind an input field to a jquery-ui slider handle

  - by BFTrick

  hello, I want to bind an input field to the jquery-ui slider handle. So whenever one value changes I want the other value to also change. Ex: if someone types 1000 into the minimum value input field I want the lower slider handle to move to the 1000 mark. Also if the user drags the lower slider handle to 1000 the input field should reflect that. Making the slider reflect the changes in the input field is easy: $(minYearInput).blur(function () { $("#yearSlider").slider("values", 0, parseInt($(this).val())); }); $(maxYearInput).blur(function () { $("#yearSlider").slider("values", 1, parseInt($(this).val())); }); I just need help making the text fields mimic the slider. $("#yearSlider").slider({ range: true, min: 1994, max: 2011, step: 1, values: [ 1994 , 2011 ], slide: function(event, ui) { //what goes here? } }); Any ideas? A similar question from this site: http://stackoverflow.com/questions/1330008/jquery-ui-slider-input-a-value-and-slider-move-to-location

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• simple regex to splice out text in ruby

  - by user141146

  I'm using ruby and I want to splice out a piece of a string that matches a regex (I think this is relatively easy, but I'm having difficulty) I have several thousand strings that look like this (to varying degrees) my_string = "adfa <b>weru</b> orua fklajdfqwieru ofaslkdfj alrjeowur woer woeriuwe <img src=\"/images/abcde_111-222-333/111-222-333.xml/blahblahblah.jpg\" />" I would like to splice out the /111-222-333.xml (the value of this changes from string to string, but suffice it to say is that I want to remove the piece between 2 forward slashes that contains something.xml. my hope was to find a match like this my_match = my_string.match(/\/.+?\.xml\//) but this actually captures "/b> orua fklajdfqwieru ofaslkdfj alrjeowur woer woeriuwe <img src=\"/images/abcde_111-222-333/111-222-333.xml/" I assumed that .+? would match what I am looking for, but it seems like it starts with the first forward slash that it finds (even though it's non-greedy) and then expands forward to the ".xml"). Any thoughts on what I'm doing wrong? TKS!!

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• C#: How to Make it Harder for Hacker/Cracker to Get Around or Bypass the Licensing Check?

  - by Peter Lee

  Hi all, Suppose that the user has saved the License file under the Application.StartupPath, where all users can read. And then, every time when the app starts, it will check if it can find and verify the license file. If the app can find and verify, we let the user to continue with full functinalities. If not, we prompt a MessageBox showing "Unlicencsed, continue to use with trial version, functionalities limited." My question is, if I'm a hacker/cracker, I would try to get around or bypass the licensing check instead of cracking the license file, because, if we use RSA signature, it's very difficult to crack a license file. So where should we put the license check? thanks. Merry Christmas and Happy New Year! Peter P.S.: and also, is it safe if I put a global variable IsLicensed (true / false) to limit the functionalities? Is it easy for a hacker to change IsLicensed = true?

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• How to get the contents of the wav file into array so as to cut the required segment and convert it

  - by kaushik

  How to get the contents of the wav file into array so as to cut the required segment and convert it back to wav format using python?? My prob is similar to "ROMANs" prob,i hav seen earlier in the post at this site.. Basically,i want to combine parts of different wav file into one wav file?? if there is ne other apporach thn takin the contents into an array and cuting part and combining and again converting bac? please suggest... edited: I prefer unpacking the contents of the wave file into an array and editing by cutting the required segment of sound from the wav file,as i am working on speech processing,and guess this way would be easy to enchance the quality of sound later... can ne one suggest a way for this?? Plz help.. Thanks in advance.

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• Resources check

  - by Chris

  hey I am frequently uploading my XCode iPhone projects to an svn repository to be build on another machine. My problem is that when I add resources to my project sometimes I forget to add the resource as relative to the project. I know one answer is to be more careful (not easy when your tired!) but if there was a way to run a script to check my resource paths are relative when I build and warn me if they are not it would be a great time saver for me. How would I go about doing this? Thanks Chris

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• Jquery autocomplete for input form, using Textpattern category list as a source

  - by John Stephens

  I'm using the Textpattern CMS to build a discussion site-- I have a firm grasp of XHTML and CSS, as well as Textpattern's template language, but PHP and Javascript are a bit beyond my cunning. On the input form to begin a new topic, users need to select a category from a list of over 5,000 options. Using the HTML select-type input element is very unwieldy, but it works. I would like to use some kind of Javascript magic to display a text-type input element that will read user input and display matches or autocomplete from the available categories, passing the required option's value into the appropriate database field. I've seen several autocomplete plugins for jquery, but the instructions presuppose that you understand how Javascript works. As I mentioned above, it's easy for me to generate the category list as a select-type input element, and I can hide that element using CSS. Is it possible to control select-list input using an autocomplete mechanism in a text-type input element? How would I do that?

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• Why do I not get the correct answer for Euler 56 in J?

  - by Gregory Higley

  I've solved 84 of the Project Euler problems, mostly in Haskell. I am now going back and trying to solve in J some of those I already solved in Haskell, as an exercise in learning J. Currently, I am trying to solve Problem 56. Let me stress that I already know what the right answer is, since I've already solved it in Haskell. It's a very easy, trivial problem. I will not give the answer here. Here is my solution in J: digits =: ("."0)":"0 eachDigit =: adverb : 'u@:digits"0' NB. I use this so often I made it an adverb. cartesian =: adverb : '((#~ #) u ($~ ([:*~#)))' >./ +/ eachDigit x: ^ cartesian : i. 99 This produces a number less than the desired result. In other words, it's wrong somehow. Any J-ers out there know why? I'm baffled, since it's pretty straightforward and totally brute force.

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• Efficient way to create/unpack large bitfields in C?

  - by drhorrible

  I have one microcontroller sampling from a lot of ADC's, and sending the measurements over a radio at a very low bitrate, and bandwidth is becoming an issue. Right now, each ADC only give us 10 bits of data, and its being stored in a 16-bit integer. Is there an easy way to pack them in a deterministic way so that the first measurement is at bit 0, second at bit 10, third at bit 20, etc? To make matters worse, the microcontroller is little endian, and I have no control over the endianness of the computer on the other side.

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• Render view as string then redirect.

  - by JohnRudolfLewis

  In my ASP.NET MVC application, I would like my controller action to render a view to a string, send an email using that string as the body, then do a redirect. I've found several articles here on SO and elsewhere on how to render the view to a string. That part was easy. But when I attempt to perform the redirect, I get an HttpException: Cannot redirect after HTTP headers have been sent. I've tried setting Response.Buffer and Response.BufferOutput to true, I've tried Response.Clear, nothing seems to work. Is it possible to render a view to a string, then do a redirect?

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• Compare values for audit trail

  - by kagaku

  I'm attempting to develop an audit trail/tracking solution for an existing database written in PLSQL/PHP - however I'm still unsure as of yet on an easy (to implement and maintain) solution for tracking changes to fields/values. For instance, the project tracking portion of the DB APP tracks over 200 fields and ideally I'd like a nice way to show a history of changes, such as: 5/10/2010 - Project 435232 updated by John Doe Changed Project Name (Old: Test Project; New: Super Test Project) Changed Submission Date (Old: 5/10/2010; New: 5/11/2010) Changed Description (Old: This is an example!; New: This is a test example) Essentially for each field (db column) it would output a new line to show the old/new values. So far my current idea is saving the current version of the data to a temporary table, updating the primary table with the new data then loading each row into an array and doing an array compare to determine the differences. This seems a bit convoluted, and if there is an easier method I'd love to know it. Any ideas or suggestions are much appreciated!

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• Stopping Windows Mobile 6.5 tab reordering

  - by PaulH

  I have a C++ Visual Studio 2008 Windows Mobile 6.5 application that uses a tab control. I've noticed that depending on how careful you are with the stylus, when using the tab control you can accidentally re-order the tabs. It's difficult to do deliberately, but it's very easy to do when you're not trying. I assume this is a new "feature" of Windows Mobile 6.5 as it doesn't happen in Windows Mobile 6.1 with the same code. Is there a window style or something I can set that will lock the tab order such that people don't accidentally re-arrange them? Also, is there an MSDN page that describes this behavior and how it is supposed to work? I've looked, but have come up empty. Thanks, PaulH

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• What do the square brackets in LaTeX logs mean?

  - by stefan-majewsky

  I'm currently working on a parser that reads complete LaTeX logs. Most of the log format is, though weird, easy to figure out, but these square brackets are puzzling me. Here's an example from near the end of one of my logs: Overfull \hbox (10.88788pt too wide) in paragraph at lines 40--40 []$[]$ [] [102]) [103] Kapitel 14. (./Thermo-141-GrenzenFundamentalpostulat.tex [104 ]) (./Thermo-142-Mastergleichung.tex [105]) (./Thermo-143-HTheorem.tex [106pdfTeX warning (ext4): destination with the same identifier (name{equation.14.3.3}) ha s been already used, duplicate ignored Can anybody give me a hint what these square brackets mean? I can't see any structure in them. I have the suspicion that lines 2/3 above are some kind of ASCII art representing the box layout, though I know too less about badboxes to justify this or identify the meaning of the single characters. Then, the "[104" etc. seem to correspond to the page numbers, but I am still not seeing the reason why there is sometimes something inbetween the square brackets (like the pdfTeX warning above), and sometimes not.

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• How to register a domain for a beginner?

  - by garbage collection

  I've never registered a .com , .net like domain before, and I would like to do some research before doing so. I currently have a ruby on rails app running Heroku. Is there anything special I have to do prior to registering domain on my ruby on rails app at all? Or is it as easy as just inserting my current Heroku address to mask it with another .com or .net name? Is there some special features I should look for registering domain? Or is it typical for domain seller to just sell domain names only? Any recommendations on sellers? Thank you.

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