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• How to convert thousands of PDF files to a single Postscript file in a specified order

  - by tggagne

  I've discovered multiple options for convert a few to serveral PDFs into Postscript, but many are command-line programs with command-line limitations (this application lives on .NET). Our application generates tens-of-thousands of PDFs that we need to send to a printer, except BEFORE the Postscript is printed we need to edit the Postscript to insert print command instructions (duplex, tray-pulls, highlight color, etc.) I think a perfect solution might allow us to write the PDFs to a stream, and simultaneously allow us to read the output stream so we may edit the Postscript before writing it to a file. Of course, if I must create the file first containing all 10,000 PDFs and edit it in an additional pass, I'm OK with that, too. I should mention that speed is important. I need to print 10,000 at a time, but need to keep the printers busy 24-hours/day.

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• Is there any simple way to test two PNGs for equality?

  - by Mason Wheeler

  I've got a bunch of PNG images, and I'm looking for a way to identify duplicates. By duplicates I mean, specifically, two PNG files whose uncompressed image data are identical, not necessarily whose files are identical. This means I can't do something simple like compare CRC hash values. I figure this can actually be done reliably since PNGs use lossless compression, but I'm worried about speed. I know I can winnow things down a little by testing for equal dimensions first, but when it comes time to actually compare the images against each other, is there any way to do it reasonably efficiently? (ie. faster than the "double-for-loop checking pixel values against each other" brute-force method?)

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• optional local variables in rails partial templates: how do I get out of the (defined? foo) mess?

  - by brahn

  I've been a bad kid and used the following syntax in my partial templates to set default values for local variables if a value wasn't explicitly defined in the :locals hash when rendering the partial -- <% foo = default_value unless (defined? foo) %> This seemed to work fine until recently, when (for no reason I could discern) non-passed variables started behaving as if they had been defined to nil (rather than undefined). As has been pointed by various helpful people on SO, http://api.rubyonrails.org/classes/ActionView/Base.html says not to use defined? foo and instead to use local_assigns.has_key? :foo I'm trying to amend my ways, but that means changing a lot of templates. Can/should I just charge ahead and make this change in all the templates? Is there any trickiness I need to watch for? How diligently do I need to test each one?

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• How do I handle a missing mandatory argument in Ruby OptionParser?

  - by Rob Jones

  In OptionParser I can make an option mandatory, but if I leave out that value it will take the name of any following option as the value, screwing up the rest of the command line parsing. Here is a test case that echoes the values of the options: $ ./test_case.rb --input foo --output bar output bar input foo Now leave out the value for the first option: $ ./test_case.rb --input --output bar input --output Is there some way to prevent it taking another option name as a value? Thanks! Here is the test case code: #!/usr/bin/env ruby require 'optparse' files = Hash.new option_parser = OptionParser.new do |opts| opts.on('-i', '--input FILENAME', 'Input filename - required') do |filename| files[:input] = filename end opts.on('-o', '--output FILENAME', 'Output filename - required') do |filename| files[:output] = filename end end begin option_parser.parse!(ARGV) rescue OptionParser::ParseError $stderr.print "Error: " + $! + "\n" exit end files.keys.each do |key| print "#{key} #{files[key]}\n" end

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• Collaborative Filtering Program: What to do for a Pearson Score When There Isn't Enough Data

  - by Mike

  I'm building a recommendation engine using collaborative filtering. For similarity scores, I use a Pearson correlation. This is great most of the time, but sometimes I have users that only share a 1 or 2 fields. For example: User 1{ a: 4 b: 2 } User 2{ a: 4 b: 3 } Since this is only 2 data points, a Pearson correlation would always be 1 (a straight line or perfect correlation). This obviously isn't what I want, so what value should I use instead? I could just throw away all instances like this (give a correlation of 0), but my data is really sparse right now and I don't want to lose anything. Is there any similarity score I could use that would fit in with the rest of my similarity scores (all Pearson)?

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• Does it take time to deallocate memory?

  - by jm1234567890

  I have a C++ program which, during execution, will allocate about 3-8Gb of memory to store a hash table (I use tr1/unordered_map) and various other data structures. However, at the end of execution, there will be a long pause before returning to shell. For example, at the very end of my main function I have std::cout << "End of execution" << endl; But the execution of my program will go something like $ ./program do stuff... End of execution [long pause of maybe 2 min] $ -- returns to shell Is this expected behavior or am I doing something wrong? I'm guessing that the program is deallocating the memory at the end. But, commercial applications which use large amounts of memory (such as photoshop) do not exhibit this pause when you close the application. Please advise :)

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• How can I make Rails 3 router to localize url's using localization files?

  - by edgerunner

  What I'd like to be able to do is: in config/routes.rb resources :posts in config/locale/en.yml en: resources: posts: "posts" new: "new" edit: "edit" in config/locale/tr.yml tr: resources: posts: "yazilar" new: "yeni" edit: "duzenle" and get I18n.locale = :en edit_post_path(3) #=> /posts/3/edit I18n.locale = :tr edit_post_path(3) #=> /yazilar/3/duzenle I'd also like rails to match any of these routes anytime and pass the associated locale in the params hash such that when I navigate to /yazilar , the request should be routed to the posts#index action. Any simple way of doing that?

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• Confused by Perl grep function

  - by titaniumdecoy

  I don't understand the last line of this function from Programming Perl 3e. Here's how you might write a function that does a kind of set intersection by returning a list of keys occurring in all the hashes passed to it: @common = inter( \%foo, \%bar, \%joe ); sub inter { my %seen; for my $href (@_) { while (my $k = each %$href) { $seen{$k}++; } } return grep { $seen{$_} == @_ } keys %seen; } I understand that %seen is a hash which maps each key to the number of times it was encountered in any of the hashes provided to the function.

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• How to pre-process CSV data for FasterCSV?

  - by Katherine Chalmers

  We're having a significant number of problems creating a bulk upload function for our little app. We're using the FasterCSV gem to upload data to a MySQL database but he Faster CSV is so twitchy and precise in its requirements that it constantly breaks with malformed CSV errors and time out errors. The csv files are generally created by users' pasting text from their web sites or from Microsoft Word docs so it is not reasonable to expect that there will never be odd characters like smart quotes or accents in the data. Also users aren't going to be readily able to identify whether their data is perfect enough for FasterCSV or not. We need to find a way to fix it for them automatically. Is there a good way or a reliable tool for pre-processing CSV data to fix any nits in the data before having the FasterCSV gem process it?

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• Problem inserting parameters into a function

  - by SoLoGHoST

  Ok, I am trying to place parameters into a function that is called like so: $parameters['function']($parameters['params']); Here is the function and the parameters that I need to be placed into this: $parameters['function'] = 'test_error'; $parameters['params'] = array(0 => $txt['sometext'], 1 => 'critical', 2 => true); The test_error function takes 3 parameters: The error to output The type of error noted within a string value ('general', 'critical', etc. etc.). Whether it should be echoed or not. Here is the output I get: Here is a test error.ArraycriticalArray1 I know this function works perfect, but it only gives me the 1st parameter returned from it. What am I doing wrong here with the $parameters['params']??

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• Filesystem synchronization library?

  - by IsaacB

  Hi, I've got 10 GB of files to back up daily to another site. The client is way out in the country so bandwidth is an issue. Does anyone know of any existing software or libraries out there that help with keeping a folder with its files synchronized across a slow link, that is it only sends files across if they have changed? Some kind of hash checking would be nice, too, to at least confirm the two sides are the same. I don't mind paying some money for it, seeing as how it might take me several weeks to a month to implement something decent on my own. I just don't want to re-invent the wheel, here. BTW it is a windows shop (they have an in house windows IT guy) so windows is preferred. I also have 10 GB of SQL Server 2000 databases to go across. Is the SQL server replication mode reliable? Thanks!

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• Perl XML::Simple XMLout function

  - by Jeremey

  I pass in the following XML to XMLin: <root foo="bar" foo2="bar2"> <pizzas> <pizza>Pepperoni</pizza> </pizzas> </root> I then edit part of the root element via hash array. I don't care about the pizza, but i do need that XML to come back out exactly as it was. However, I get the following from XMLout: <root foo="bar" foo2="bar2"> <pizzas pizza="Pepperoni"</pizzas> </root> Thoughts?

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• Sometimes UIImageView seems to reject the image taken with iPhone Camera

  - by maxbareis

  Hi, it is very strange, because this error doesn't happen all the time... I have the following code: - (IBAction)getPhoto:(id)sender { UIImagePickerController * picker = [[UIImagePickerController alloc] init]; picker.delegate = self; #if TARGET_IPHONE_SIMULATOR picker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary; #else picker.sourceType = UIImagePickerControllerSourceTypeCamera; #endif [self presentModalViewController:picker animated:YES]; } with the corresponding delegated selector - (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info { UIImage *image = [[info objectForKey:@"UIImagePickerControllerOriginalImage"] imageByScalingToSize:CGSizeMake(480, 320)]; [[self imageView] setImage:image]; [picker dismissModalViewControllerAnimated:YES]; } strange thing is, somtimes the image appears in imageView and sometimes not. I have called (gdb) po UIImagePNGRepresentation(image) right after setImage and stuffed the output into a file. The file is a perfect png. Has anyone experienced the same? Has anyone found a solution for it? Thanks in advance Max

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• Box-shadow and border-radius bug in Chrome

  - by Klaster_1

  Hello, I've been experimenting with CSS3 and found something strange. Heres's the part of DIV style: border:#446429 solid 1px; border-radius:15px; -moz-border-radius:15px; -webkit-border-radius:15px; box-shadow:3px 0px 15px #000000 inset,0px 3px 15px #000000 inset; -moz-box-shadow:3px 0px 15px #000000 inset,0px 3px 15px #000000 inset; -webkit-box-shadow:3px 0px 15px #000000 inset,0px 3px 15px #000000 inset; Rendering in Opera and Firefox are same and perfect: But Chrome renders shadow outside the border: Is it supposed to be so or I missed something important?

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• NHibernate, the Parallel Framework, and SQL Server

  - by andy

  hey guys, we have a loop that: 1.Loops over several thousand xml files. Altogether we're parsing millions of "user" nodes. 2.In each iteration we parse a "user" xml, do custom deserialization 3.finally, in each iteration, we send our object to nhibernate for saving. We use: .SaveOrUpdateAndFlush(user); This is a lengthy process, and we thought it would be a perfect candidate for testing out the .NET 4.0 Parallel libraries. So we wrapped the loop in a: Parallel.ForEach(); After doing this, we start getting "random" Timeout Exceptions from SQL Server, and finally, after leaving it running all night, OutOfMemory unhandled exceptions. I haven't done deep debugging on this yet, but what do you guys think. Is this simply a limitation of SQL Server, or could it be our NHibernate setup, or what? cheers andy

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• MAD method compression function

  - by Jacques

  I ran across the question below in an old exam. My answers just feels a bit short and inadequate. Any extra ideas I can look into or reasons I have overlooked would be great. Thanx Consider the MAD method compression function, mapping an object with hash code i to element [(3i + 7)mod9027]mod6000 of the 6000-element bucket array. Explain why this is a poor choice of compression function, and how it could be improved. I basically just say that the function could be improved by changing the value for p (or 9027) to an prime number and choosing an other constant for a (or 3) could also help.

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• Parsing Indentation-based syntaxes in Haskell's Parsec

  - by pavpanchekha

  I'm trying to parse an indentation-based language (think Python, Haskell itself, Boo, YAML) in Haskell using Parsec. I've seen the IndentParser library, and it looks like it's the perfect match, but what I can't figure out is how to make my TokenParser into an indentation parser. Here's the code I have so far: import qualified Text.ParserCombinators.Parsec.Token as T import qualified Text.ParserCombinators.Parsec.IndentParser.Token as IT lexer = T.makeTokenParser mylangDef ident = IT.identifier lexer This throws the error: parser2.hs:29:28: Couldn't match expected type `IT.TokenParser st' against inferred type `T.GenTokenParser s u m' In the first argument of `IT.identifier', namely `lexer' In the expression: IT.identifier lexer In the definition of `ident': ident = IT.identifier lexer What am I doing wrong? How should I create an IT.TokenParser? Or is IndentParser broken and to be avoided?

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• Rails: translations for table's column.

  - by Andrew

  In rails application I have two models: Food and Drink. Both food and drink have a name, which has to be stored in two languages. How do I better realize translations for theese tables? First solution I realized was to replace name column with name_en and name_ru. Another solution is to encode with YAML hash like { :en => 'eng', :ru => 'rus' } and store yaml as a name. What would you recommend, assuming content is not static? Maybe there's good article?

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• Fetch Latitude Longitude by passing postcodes to maps.google.com using Javascript

  - by Nirmal

  Hello All... I have Postcode in my large database, which contains values like SL5 9JH, LU1 3TQ etc. Now when I am pasting above postcode to maps.google.com it's pointing to a perfect location.. My requirement is like I want to pass post codes to maps.google.com and it should return a related latitude and longitude of that pointed location, that I want to store in my database. So, most probably there should be some javascript for that... If anybody have another idea regarding that please provide it.. Thanks in advance...

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• Prototype.js: How can i return an array without all the methods Prototypes extends Array with?

  - by Morten

  Hi! Is there a way to return a new version of an array/hash that does not contain all the methods/functions that prototype extends the array object with? Example: var myArray = $A(); myArray['test'] = '1'; myArray['test2'] = '2'; var myVariableToPassToAjax = myArray; If I debug myVariableToPassToAjax it looks like this: Array ( [test] = 1 [test2] = 2 [each] = function each(iterator, context) { .......... .......... } ...and all the other extended array functions ); Is there a way to solve this? :-/ Morten

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• WPF Visual States and the transitions between them

  - by Mark

  I'm trying to define many different states in my app (around 7 in my case) and I have defined each one of them with a "Default Transition" of zero seconds, but the animation that accompanies each state goes for 1 second. When I fire up my app I have a button than goes through the states one by one, when I go "State1" - "State2" it looks perfect, but when I tell my app (which should be in State2 now) to go to "State3" it reverts all the objects in my scene back to their base state, and then animates to "State3", why doesnt it go from "State2" to "State3". I was hoping to only define each state's end position without defining a starting position as this would really take a long time to do. Can this be done? Any examples? Cheers, Mark

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• Server authorization with MD5 and SQL.

  - by Charles

  I currently have a SQL database of passwords stored in MD5. The server needs to generate a unique key, then sends to the client. In the client, it will use the key as a salt then hash together with the password and send back to the server. The only problem is that the the SQL DB has the passwords in MD5 already. Therefore for this to work, I would have to MD5 the password client side, then MD5 it again with the salt. Am I doing this wrong, because it doesn't seem like a proper solution. Any information is appreciated.

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• What is the most efficient Java Collections library?

  - by dehmann

  What is the most efficient Java Collections library? A few years ago, I did a lot of Java and had the impression back then that trove is the best (most efficient) Java Collections implementation. But when I read the answers to the question "Most useful free Java libraries?" I noticed that trove is hardly mentioned. So which Java Collections library is best now? UPDATE: To clarify, I mostly want to know what library to use when I have to store millions of entries in a hash table etc. (need a small runtime and memory footprint).

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• Stand - alone application with JBoss or Tomcat

  - by sufoid

  Hallo, I have a more specific question about deploying a Java-application. I have created a Java application, it is a WAR file and can be installed on any Java application server. This works perfect. Now for users who do not have Java experience I want to package somehow my application together with the application server and distribute it as a stand-alone version. Question 1: Is this possible? Question 2: Which application server would be best for this? Question 3: Where should I start to learn how to do this? Do you have any experience you can share with me. Thanks.

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• Force save files all browsers - not open in browser window

  - by Joshc

  I'm after a simple solution to work in all browsers. For specific file types, or targeted links via a class: how can I get them to simply force download in all major browsers. I thought I found the perfect solution for apachce server - by adding this into the .htaccess. http://css-tricks.com/snippets/htaccess/force-files-to-download-not-open-in-browser/ AddType application/octet-stream .csv AddType application/octet-stream .xls AddType application/octet-stream .doc AddType application/octet-stream .avi AddType application/octet-stream .mpg AddType application/octet-stream .mov AddType application/octet-stream .pdf Seems to work in Firefox and Safari, but not chrome or IE (have not tested anything else) Can any one please help me with a solution on how to make links to force download the file, instead of opening in the browser, for ALL browsers. I can't seem to find a full browser proof solution. Is it not possible? Any links to tutorial or snippets would be awesome. My website if PHP based so can make it work with PHP if posible. Thanks

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