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• Reading a bmp file and inverting it in C

  - by user1763396

  I have an assignment that deals with reading a bmp file into memory, inverts the pixels, and then saves the inverted image to a new file. From this description it seems fairly easy, however I don't think my professor did a great job in explaining the necessary steps to go about doing so. He taught us about fread and fwrite but there is so much more. Can anyone explain the process in going about this problem (I'm no looking for a direct answer just an explanation). Here is the link to the problem's description: https://engineering.purdue.edu/OOSD/F2012/Exercises/ex5.html Thanks in advance for any sort of help. NOTE: I actually have looked into this problem but since I don't have a good standing on this info it's not quite "clicking".

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• Optimizing MySQL queries with IN operator

  - by Arkadiusz Kondas

  I have a MySQL database with a fairly large table where the products are. Each of them has its own id and categoryId field where there is a category id belongs to this product. Now I have a query that pulls out products from given categories such as: SELECT * FROM products WHERE categoryId IN ( 1, 2, 3, 4, 5, 34, 6, 7, 8, 9, 10, 11, 12 ) Of course, come a WHERE clause and ORDER BY sort but not in this thing. Let's say that these products is 250k and the visits are over 100k per day. Under such conditions in the table slow_log registered weight of these queries with large generation time. Do you have any ideas how to optimize the given problem? Table engine is MyISAM.

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• Hibernate HQL to basic SQL (no joins)

  - by CC

  Hello everybody, I working on a project with Hibernate and we need to replace Hibernate with some "home made persistence" stuff. The idea is that the project is big enough, and we have many HQL queries. The problem is with the queries like select a,b from table1, table2 on t1.table1=t2.table2 Basically all joins are not supported by our "hand made persistence" stuff. What I would need, is to be able to do some sort of transcoder, which will take as a input the HQL queries and output some SQL, but SQL without joins I hope you get the idea. My persistence layer does not supports joins. Does anybody has any idea about something like that? Some framework, or something? Thanks alot everybody. C.C.

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• Is it possible to get the current request that is being served by node.js?

  - by user420504

  I am using express.js. I have a need to be able to log certain request data whenever someone tries to log a message. For this I would like to create a helper method like so function log_message(level, message){ winston.log(level, req.path + "" + message); } I would then use the method like so. exports.index = function(req, res){ log_message("info", "I'm here"); } Note that I am not passing the req object to the log_message function. I want that to be transparently done so that the log_message API user does not need to be aware of the common data that is being logged. Is there a way to achieve this with express.js/node.js. Is the request object available from a global variable of some sort?

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• Working with sets of rows in (My)SQL and comparing values

  - by Pep.

  Hello, I am trying to figure out the SQL for doing some relatively simple operations on sets of records in a table but I am stuck. Consider a table with multiple rows per item, all identified by a common key. For example: serial model color XX1 A blue XX2 A blue XX3 A green XX5 B red XX6 B blue XX1 B blue What I would for example want to do is: Assuming that all model A rows must have the same color, find the rows which dont. (for example, XX3 is green). Assuming that a given serial number can only point to a single type of model, find out the rows which that does not occur (for example XX1 points both to A and B) These are all simple logically things to do. To abstract it, I want to know how to group things by using a single key (or combination of keys) and then compare the values of those records. Should I use a join on the same table? should i use some sort of array or similar? thanks for your help

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• SEO on a login based website

  - by Paul

  Ok so say I have a website that the majority of content is behind a closed door, login screen for paying customers only. How can I let google know what is there so people can find the site through a search engine. What programming techniques could I use to give more content to the google bot. I will have some overview and demonstration screens to tempt the users but will these five to ten pages of content be enough for the search engines. The key work is quite a highly sort one and there is quite alot of competition. And before anyone asks the site is not a subscription porn site (Sadly)

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• [Android] How to launch an Activity without a UI?

  - by fjmustak

  Is it in any way possible to launch an activity from the main function without having a UI? i.e. is there a way to create a sort of "wrapper" around another activity, i.e. by launching the main activity, it takes you to another activity automatically. If that is not possible, is there a way to remove the main activity from the stack so that clicking the back button does not take you to a blank UI? Here's an example of what I'm trying to do: public class WrapperActivity extends Activity { /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); final Intent intent = new Intent(Intent.ACTION_DIAL, Uri.parse("tel:555-1212")); startActivity(intent); } }

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• How to identify each parameter type in a C# method?

  - by user465876

  I have a C# method say: MyMethod(int num, string name, Color color, MyComplexType complex) Using reflection, how can I distinctly identify each of the parameter types of any method? I want to perform some task by parameter type. If the type is simple int, string or boolean then I do something, if it is Color, XMLDocument, etc I do something else and if it is user defined type like MyComplexType or MyCalci etc then I want to do certain task. I am able to retrieve all the parameters of a method using ParameterInfo and can loop through each parameter and get their types. But how can I identify each data type? foreach (var parameter in parameters) { //identify primitive types?? //identify value types //identify reference types } Edit: this is apart of my code to create a propert grid sort of page where I want to show the parameter list with data types for the selected method. If the parameter has any userdefined type/reference type then I want to expand it further to show all the elements under it with datatypes.

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• Using Option all over the place feels a bit awkward. Am I doing something wrong?

  - by Geo

  As a result of articles I read about the Option class which helps you avoid NullPointerException's, I started to use it all over the place. Imagine something like this: var file:Option[File] = None and later when I use it: val actualFile = file.getOrElse(new File("nonexisting")) if(actualFile.getName.equals("nonexisting")) { // instead of null checking } else { // value of file was good } Doing stuff like this doesn't feel all that "right" to me. I also noticed that .get has become deprecated. . Is this sort of stuff what you guys are doing with Option's too, or am I going the wrong way?

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• Incremental Union?

  - by cam

  I'm trying to describe a Sudoku Board in C++ with a union statement: union Board { int board[9][9]; int sec1[3][3]; int sec2[3][3]; int sec3[3][3]; int sec4[3][3]; int sec5[3][3]; int sec6[3][3]; int sec7[3][3]; int sec8[3][3]; int sec9[3][3]; } Would each section of the board correspond with the correct part of the array? IE, Would sec4 correspond with board[4-6][0-3]? Is there a better way to do this sort of thing (specifically describing a sudoku board)?

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• Elegant ways of displaying a GridView with lots of columns (ASP.NET)

  - by Chris

  Hi, just a general design question that I'd like to hear some of your opinions on. I am designing a system for a client, and I'm using GridView' a lot. They need a lot of columns to be displayed in some of these, and I've had to resort to using a panel with a horizontal scrollbar. This presents some issues - keeping track of which row is which is difficult, even with alternating row colours, and it's generally pretty ugly. How have you dealt with these issues before? Are there any sort of AJAX controls that could help, so some data could be only displayed on hover or such? Or any other general ideas.

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• Adding a subject line to mail address in ReCaptcha Mailhide

  - by bongman1612

  I'm not sure if this can be done. I was looking to for a way to add a subject line to an email address hidden via reCaptcha Mailhide. Usually we have a mailto tag which include a subject like so:- <a href="mailto:[email protected]">The text of your link</a> However when we use recaptcha mailhide, we encrypt the email address and the reCaptcha decrypts it for us on completion of the captcha (sort of) So nowhere am I actually setting the subject of the email. Is there a workaround for this?

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• [CakePHP] How to add some action after login (and before redirection)?

  - by user198003

  hello, trying to develop some sort of login tracker for my cakephp application. i know that i need code like: $this->data['LoginSession']['username'] = $_SERVER['REMOTE_ADDR']; $this->data['LoginSession']['ipAddress'] = $_SERVER['REMOTE_ADDR']; $this->LoginSession->save($this->data); ... in (i guess) users_controller, but don't know exactly where. also i would like to track successful, but also unsuccessful logins. can you help me with this please? thank you in advance!

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• Quicktabs with AJAX Views

  - by Primus202

  I'm working in Drupal 7 with the quicktabs and views modules. I have a great looking tabbed set of tables filled with data. However, despite all the views having AJAX turned on, trying to do a column sort (or use the pager I imagine though currently there is not enough content to require one) causes the page to reload with a new URL instead of simply reloading the view in question. I found on Drupal some fixes for this problem but all seem to be in Drupal 6. Anyone have a patch for 7?

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• building a hash lookup table during `git filter-branch` or `git-rebase`

  - by intuited

  I've been using the SHA1 hashes of my commits as references in documentation, etc. I've realized that if I need to rewrite those commits, I'll need to create a lookup table to correspond the hashes for the original repo with the hashes for the filtered repo. Since these are effectively UUID's, a simple lookup table would do. I think that it's relatively straightforward to write a script to do this during a filter-branch run; that's not really my question, though if there are some gotchas that make it complicated, I'd certainly like to hear about them. I'm really wondering if there are any tools that provide this functionality, or if there is some sort of convention on where to keep the lookup table/what to call it? I'd prefer not to do things in a completely idiosyncratic way.

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• Is there a way to redirect ONLY stderr to stdout (not combine the two) so it can be piped to other programs

  - by James K

  I'm working in a Windows CMD.EXE environment and would like to change the output of stdout to match that of stderr so that I can pipe error messages to other programs without the intermediary of a file. I'm aware of the 2>&1 notation, but that combines stdout and stderr into a single stream. What I'm thinking of would be something like this: program.exe 2>&1 | find " " But that combines stdout and stderr just like: program.exe | find " " 2>&1 I realize that I could do... program 2>file type file | find " " del file But this does not have the flexibility and power of a program | find " " sort of notation. Doing this requires that program has finished with it's output before that output can be processed.

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• PHP Detect Pages Genre/Category

  - by Alexwhin

  Hey, I was wondering if their was any sort of way to detect a pages genre/category. Possibly their is a way to find keywords or something? Unfortunately I don't have any idea so far, so I don't have any code to show you. But if anybody has any ideas at all, let me know. Thanks! EDIT @Nican Perhaps their is a way to set, let's say 10 category's (Entertainment, Funny, Tech). Then creating keywords for these category's (Funny = Laughter, Funny, Joke etc). Then searching through a webpage (maybe using a cUrl) for these keywords and assigning it to the right category. Hope that makes sense.

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• Is there any reason I shouldn't do database calls from the destructor?

  - by ryeguy

  I want to create a sort of datamapper library, where you'd do something like this: $users = Users::getTable(); $users->add($newUser1); $users->add($newUser2); Now $users contains 2 user records, but they aren't yet persisted to the database. To be efficient, I'd like to flush them all at once. I would like to have a flush() method to do this (not an issue), but I'd also like for it to happen implicitly when the $users table reference falls out of scope. Is there any reason I shouldn't do this in the destructor?

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• Best way to get the values of a hash ordered by their respective keys? (Ruby)

  - by they changed my name

  Here's what I'm doing atm: test = { 'd' => 20, 'b' => 40, 'c' => 30, 'a' => 10, 'e' => 50 } f = [] test.to_a.each do |e| f << e[1] end puts f.sort.join(' ') Outputs: 10 20 30 40 50 Is there a more efficient/concise/better way to do this? And before someone says so, no, I can't use an array. :p

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• How to compare Rails ''executables" before and after refactor?

  - by Kyle Heironimus

  In C, I could generate an executable, do an extensive rename only refactor, then compare executables again to confirm that the executable did not change. This was very handy to ensure that the refactor did not break anything. Has anyone done anything similar with Ruby, particularly a Rails app? Strategies and methods would be appreciated. Ideally, I could run a script that output a single file of some sort that was purely bytecode and was not changed by naming changes. I'm guessing JRuby or Rubinus would be helpful here.

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• Why would you use a MyObject[] internally, but expose a List<MyObject>?

  - by timmyd

  I have come across a class that has an immutable property: MyObject[] allObjs The property is initialized like this: List<MyObject> objs = createAllMyObjects(); allObjs = objs.toArray(new MyObject[objs.size()]); When it is exposed through the accessor, it's done as a List: public List<MyObject> getAllMyObjects() { return Collections.unmodifiableList(Arrays.asList(allObjs)); } Why would a programmer do this? Is there a benefit that I don't know about? Performance is not a concern, as the array of objs will only ever number in a few dozen elements. It seems that we are going round and round in circles. The class is a sort of factory, so it's got a private constructor and exposes only static methods (not sure if this could be a reason for the madness).

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• Is there a tool to discover if the same class exists in multiple jars in the classpath?

  - by David Citron

  If you have two jars in your classpath that contain different versions of the same class, the classpath order becomes critical. I am looking for a tool that can detect and flag such potential conflicts in a given classpath or set of folders. Certainly a script that starts: classes=`mktemp` for i in `find . -name "*.jar"` do echo "File: $i" > $classes jar tf $i > $classes ... done with some clever sort/uniq/diff/grep/awk later on has potential, but I was wondering if anyone knows of any existing solutions.

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• Make jQuery AJAX have a non-javascript (non-ajax) fallback?

  - by DrAgonmoray

  I've gotten a fair amount of work done on my latest project, but I've realized there's a bit of a problem: If you don't have a Javascript-enabled browser, you can't submit any forms because every form uses AJAX to submit it. My question to you all: How can I implement some sort of "fallback" so that if they don't have Javascript enabled, they can still submit the form. Currently I have a banner along the header that says "For the optimal (and by "optimal," we mean "actually working") experience, please enable Javascript in your browser." but that seems like less than the optimal solution. Thanks!

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• Object directing to a property when accessed as an iterable

  - by ThE_JacO

  I'm trying to figure out if there's an elegant and concise way to have a class accessing one of its own properties when "used" as a dictionary, basically redirecting all the methods that'd be implemented in an ordered dictionary to one of its properties. Currently I'm inheriting from IterableUserDict and explicitly setting its data to another property, and it seems to be working, but I know that UserDict is considered sort of old, and I'm concerned I might be overlooking something. What I have: class ConnectionInterface(IterableUserDict): def __init__(self, hostObject): self._hostObject= hostObject self.ports= odict.OrderedDict() self.inputPorts= odict.OrderedDict() self.outputPorts= odict.OrderedDict() self.data= self.ports This way I expect the object to behave and respond (and be used) the way I mean it to, except I want to get a freebie ordered dictionary behaviour on its property "ports" when it's iterated, items are gotten by key, something is looked up ala if this in myObject, and so on. Any advice welcome, the above seems to be working fine, but I have an odd itch that I might be missing something. Thanks in advance.

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• Is it possible (and if so how) to delete a zookeeper node with apache camel?

  - by b_habegger

  I am looking into using Zookeeper to synchronized distributed Camel instances. In doing so it seems that there is not possibility to delete a znode from Zookeeper from Camel (I imagined some sort of producer operation). A look at the components source seems to confirm this. (I didn't find any code explicitely requesting a node removal). Am I missing something ? When would a node created via Camel (in my case EPHEMERAL) be deleted ? Maybe I am miss understanding something with zookeeper ?

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