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• Developing a rich internet application

  - by Serge

  Hello, I have been a desktop developer for a few years mostly doing object oriented stuff. I am trying to branch out into web development, and as a hobby project trying to put a web application together. I have been reading quite alot of information, but I still can't seem to decide on the path to take and would really like some advice. Basically, I want to build something like this: http://mon.itor.us/ I have found this as well: http://www.trilancer.com/jpolite/#t1 But so far it is of little use as I am trying to grasp Javascript. I have been using visual studio for that, is that a good IDE for this tye of thing or should I try expression blend? Jpolite seems to do everything with javascript, which seems kind of cool, but I if I want to make a chart inside a widget that connects to a database, do I need something more? Is this where ASP.NET comes in? I am familiar with .NET, but if I use ASP.NET for my website, do I have to host it on IIS and windows server as opposed to Apache since mono is still being ironed out? Because that would cost more, so would PHP be a better choice? Also, for charting these guys as well as google seem to use flex: http://www.google.com/finance I have found this: http://www.reynoldsftw.com/2009/03/javascript-chart-alternatives/ Would that be sufficient to implement something like google fiance purely in javascript or is there a good reason they use flex? SOrry for the long post but I was trying to be as detailed as possible. Thanks.

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• iPhone sdk Cocoa Touch - Pass touches down from parent UIView to child UIScrollview

  - by Joe

  I have a UIView inside my xib in IB and inside that is a UIScrollview that is a small 80x80 square and dynamically loaded with 8 or so 80 x 80 thumbnail images. The UIScrollview is not clipping the images so that they extend out either side so you can swipe left and right to scroll a chosen image into the the centre, paging is on so they snap ti each image. I have researched and found this is the best and possibly only way to do this. The UIScrollview sits in a 'container' UIView for one reason, it is there to receive the touches/swipes and pass them down to it's child the UIScrollview as otherwise all touches would have to start in the small 80x80 UIScrollview area and I wan them to be anywhere along the row of images. I have seen some sample code somewhere for doing this but just can not implement it. Treat me as a noob, starting from beginning to end, how should the UIView and UIScrollview be set up in IB to allow any touches to be passed, and what code should I put into where? The UIView is set up as scroll_container and the child UIScrollview is char_scroll At the moment I have got it all working except for the touches being passed from the parent to the child, and at the moment the touches have to always start inside the UIScrollview (tiny 80x80 box in centre) when I want to be able to swipe left or right in the long 480X80 horizontal parent UIView and have this still scroll the child UIScrollview. Hope you can help and understand what I mean!

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• How would you answer Joel's sample programming questions?

  - by Khorkrak

  I recently interviewed a candidate for a new position here. I wish though that I'd read Joel's Guerrilla Guide to Interviewing prior to that interview - naturally I happened upon it the night afterwards :P http://www.joelonsoftware.com/articles/GuerrillaInterviewing3.html So I tried answering the easy questions myself - yeah I used the python interpreter to type stuff in and tested the results a bit - I didn't look up any solutions beforehand though and I also thought about how long it took me to come up with answers for each one and what I'd look for the next time I interview someone. I'd let them type stuff into the interpreter and see how did used python's introspection capabilities too to find out things like what's the re module's method for building a regex etc. Here are my answers - these are in python of course - what are yours in your favourite language? Do you see any issues with the answers I came up with - i.e. how could they be improved upon - what did I miss? Joel's example questions: Write a function that determines if a string starts with an upper-case letter A-Z. import re upper_regex = re.compile("^[A-Z]") def starts_with_upper(text): return upper_regex.match(text) is not None Write a function that determines the area of a circle given the radius. from math import pi def area(radius): return pi * radius**2 Add up all the values in an array. sum([1, 2, 3, 4, 5]) Harder Question: Write an example of a recursive function - so how about the classic factorial one: def factorial(num): if num > 1: return num * factorial(num - 1) else: return 1

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• Can anyone tell me about a jQuery modal dialog box library that doesn't suck

  - by Ritesh M Nayak

  jQuery based modal dialog boxes are great as long as you do as much as the example tells you to. I need a jQuery based modal dialog box library that has to have the following characteristics: It should be fast, something like the add and link dialog on StackOverflow. Most libraries take an eternity to load the dialog with its fancy effects and stuff. I want to call it using a script. Show a hidden div or a span element inline. MOst of the libraries talk filling an anchor with rel, class and href=#hiddenDiv sort of things. I need to be able to what I want without adding unnecessary attributes to my anchor. Something like this function showDialog(values) { processToChangeDom(values); changeDivTobeDisplayed(); modalDialog.show(); } It should reflect changes I make to the DOM in the hidden Div. I used facebox and found out that it makes a copy of the hidden div and changes to the DOM doesn't reflect on the modal window. I need to be able call the close modal div using javascript and also attach beforeOpen and afterClose handlers to the action. Does anyone have any suggestions? I have already tried facebox, simplemodal and a whole range of libraries, most of them don't support one or the other of these functions I described above.

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• Difference in performance between Stax and DOM parsing

  - by Fazal

  I have been using DOM for a long time and as such DOM parsing performance wise has been pretty good. Even when dealing with XML of about 4-7 MB the parsing has been fast. The issue we face with DOM is the memory footprint which become huge as soon as we start dealing with large XMLs. Lately I tried moving to Stax (Streaming parsers for XML) which are supposed top be second generation parsers (reading about Stax it said its the fastest parser now). When I tried stax parser for large XML for about 4MB memory footprint definitely reduced drastically but time take to parse entire XML and create java object out of it increased almost by 5 times over DOM. I used sjsxp.jar implementation of Stax. I can deuce to some extent logically that performance may not be extremely good due to streaming nature of the parser but a reduction of 5 time (e.g. DOM takes about 8 seconds to build object for this XML, whereas Stax parsing took about 40 seconds on average) is definitely not going to be acceptable. Am I missing some point here completely as I am not able to come to terms with these performance numbers

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• Analyzing data from same tables in diferent db instances.

  - by Oscar Reyes

  Short version: How can I map two columns from table A and B if they both have a common identifier which in turn may have two values in column C Lets say: A --- 1 , 2 B --- ? , 3 C ----- 45, 2 45, 3 Using table C I know that id 2 and 3 belong to the same item ( 45 ) and thus "?" in table B should be 1. What query could do something like that? EDIT Long version ommited. It was really boring/confusing EDIT I'm posting some output here. From this query: select distinct( rolein) , activityin from taskperformance@dm_prod where activityin in ( select activityin from activities@dm_prod where activityid in ( select activityid from activities@dm_prod where activityin in ( select distinct( activityin ) from taskperformance where rolein = 0 ) ) ) I have the following parts: select distinct( activityin ) from taskperformance where rolein = 0 Output: http://question1337216.pastebin.com/f5039557 select activityin from activities@dm_prod where activityid in ( select activityid from activities@dm_prod where activityin in ( select distinct( activityin ) from taskperformance where rolein = 0 ) ) Output: http://question1337216.pastebin.com/f6cef9393 And finally: select distinct( rolein) , activityin from taskperformance@dm_prod where activityin in ( select activityin from activities@dm_prod where activityid in ( select activityid from activities@dm_prod where activityin in ( select distinct( activityin ) from taskperformance where rolein = 0 ) ) ) Output: http://question1337216.pastebin.com/f346057bd Take for instace activityin 335 from first query ( from taskperformance B) . It is present in actvities from A. But is not in taskperformace in A ( but a the related activities: 92, 208, 335, 595 ) Are present in the result. The corresponding role in is: 1

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• JPA 2 Criteria API: why is isNull being ignored when in conjunction with equal?

  - by Vítor Souza

  I have the following entity class (ID inherited from PersistentObjectSupport class): @Entity public class AmbulanceDeactivation extends PersistentObjectSupport implements Serializable { private static final long serialVersionUID = 1L; @Temporal(TemporalType.DATE) @NotNull private Date beginDate; @Temporal(TemporalType.DATE) private Date endDate; @Size(max = 250) private String reason; @ManyToOne @NotNull private Ambulance ambulance; /* Get/set methods, etc. */ } If I do the following query using the Criteria API: CriteriaBuilder cb = em.getCriteriaBuilder(); CriteriaQuery<AmbulanceDeactivation> cq = cb.createQuery(AmbulanceDeactivation.class); Root<AmbulanceDeactivation> root = cq.from(AmbulanceDeactivation.class); EntityType<AmbulanceDeactivation> model = root.getModel(); cq.where(cb.isNull(root.get(model.getSingularAttribute("endDate", Date.class)))); return em.createQuery(cq).getResultList(); I get the following SQL printed in the log: FINE: SELECT ID, REASON, ENDDATE, UUID, BEGINDATE, VERSION, AMBULANCE_ID FROM AMBULANCEDEACTIVATION WHERE (ENDDATE IS NULL) However, if I change the where() line in the previous code to this one: cq.where(cb.isNull(root.get(model.getSingularAttribute("endDate", Date.class))), cb.equal(root.get(model.getSingularAttribute("ambulance", Ambulance.class)), ambulance)); I get the following SQL: FINE: SELECT ID, REASON, ENDDATE, UUID, BEGINDATE, VERSION, AMBULANCE_ID FROM AMBULANCEDEACTIVATION WHERE (AMBULANCE_ID = ?) That is, the isNull criterion is totally ignored. It is as if it wasn't even there (if I provide only the equal criterion to the where() method I get the same SQL printed). Why is that? Is it a bug or am I missing something?

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• Variable Scope Problem, iPhone

  - by Stumf

  Hello all, I need some help here so I will do my best to explain. I have worked on this all day and had no success (just learning!) I have: NSArray *getValue(NSString *iosearch) { ................................. ................................... \\ More code here } - (NSString *) serialnumber { NSArray *results = getValue(@"serial-number"); if (results) return [results objectAtIndex:0]; return nil; } - (NSString *) backlightlevel { NSArray *results = getValue(@"backlight-level"); if (results) return [results objectAtIndex:0]; return nil; } I have a tableView set up and want to display my array in it so I then have: - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {............. ......................................................... cell.text = [results objectAtIndex:indexPath.row]; // error results undeclared here return cell; } The problem is I get results undeclared as indicated above. I also can't figure how I could get serialnumber and backlightlevel to display on the click of a button or even at load. My attempts have thrown back errors like error: 'serialnumber' undeclared (first use in this function) and warnings like warning: 'return' with a value, in function returning void. Sorry for the long question! Many thanks, Stuart

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• Problem with apostrophes and other special characters when using aspell in windows

  - by Loftx

  Hi there, We seem to be having a problem with the spell checker on our content management system where it marks the ve part of We’ve as a misspelling. The spellchecker uses aspell which is called from a script on the server which executes the cmd.exe and uses it to pipe a file into aspell (it's a long winded way I know, but our server side programming langauge (ColdFusion) doesn't support writing to stdin for executables). Aspell is called by executing: c:\windows\system32\cmd.exe /c type d:\path_to_file\file.txt | "C:\Program Files\Aspell\bin\aspell" --lang=en -a Where file.txt contains the text to be spelled e.g. ^Oh have We’ve (the carat is added to prevent piping problems I believe). Aspell then output: @(#) International Ispell Version 3.1.20 (but really Aspell 0.50.3) * * * & ve 62 12: vie, voe, V, v, veg, vet, Be, Ce, be, Ev, E, e, vex, VA, VI, Va, Vi, vi, we, VD, VF, VG, VJ, VP, VT, Vt, vb, vs, DE, De, Fe, GE, Ge, He, IE, Le, ME, Me, NE, Ne, OE, PE, Re, SE, Se, Te, Xe, he, me, re, ye, Ave, Eve, Ive, ave, eve, VAR, var, veer, vier, view, vow However, we have a dev site, with the same version of Aspell, and when the same file is used it outputs with no misspellings. Both servers are running Aspell 0.50.3 on Windows server 2003, but there could be other differences in configuration: @(#) International Ispell Version 3.1.20 (but really Aspell 0.50.3) I'm wondering if the problem is to do with the piping part of the process or something different in the Aspell configuration. Does anyone have any ideas? Cheers, Tom

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• Problem with UIScrollView

  - by leon

  Hi, Sorry for long winded post. I am trying to understand UIScrollView and running into very simple problem. I am creating a scroll view I am making this view 1.5 size larger then normal size Using UIScrollView I expect to see some edge elements of view out of bounds, but should be able to pan the view therefore bringing missing elements back to the visible area. However I am seeing that I can't just pan/scroll view anyway I want, instead view always wants to scroll up, as soon as move away my finger from the screen (touch end event). I am not handling any touches, etc - I just want to understand why does not scaled view stay put where I scroll it? CGRect viewFrame = self.view.frame ; viewFrame.size.width *= 1.5; viewFrame.size.height *= 1.5; CGSize mySize = viewFrame.size; [ ((UIScrollView *) self.view) setContentSize: mySize]; self.view.transform = CGAffineTransformMakeScale(1.5, 1.5); What I really trying to accomplish is something similar to Number on iPad (the same code will work on iPhone): There is a view with lots of controls on it (order entry form) User can zoom into the entire form so all elements look bigger user can pan the form therefore bringing various elements into the visible area of the screen. It seems that UIScrollView can should be able to handle zoom and pan actions (for now I am using Affine Transform to zoom in to the order entry form and iPad) Thanks

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• Need advice on OOP philosophy

  - by David Jenings

  I'm trying to get the wheels turning on a large project in C#. My previous experience is in Delphi, where by default every form was created at applicaton startup and form references where held in (gasp) global variables. So I'm trying to adapt my thinking to a 100% object oriented environment, and my head is spinning just a little. My app will have a large collection of classes Most of these classes will only really need one instance. So I was thinking: static classes. I'm not really sure why, but much of what I've read here says that if my class is going to hold a state, which I take to mean any property values at all, I should use a singleton structure instead. Okay. But there are people out there who for reasons that escape me, think that singletons are evil too. None of these classes is in danger of being used anywhere except in this program. So they could certainly work fine as regular objects (vs singletons or static classes) Then there's the issue of interaction between objects. I'm tempted to create a Global class full of public static properties referencing the single instances of many of these classes. I've also considered just making them properties (static or instance, not sure which) of the MainForm. Then I'd have each of my classes be aware of the MainForm as Owner. Then the various objects could refer to each other as Owner.Object1, Owner.Object2, etc. I fear I'm running out of electronic ink, or at least taxing the patience of anyone kind enough to have stuck with me this long. I hope I have clearly explained my state of utter confusion. I'm just looking for some advice on best practices in my situation. All input is welcome and appreciated. Thanks in advance, David Jennings

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• Code Golf: Quickly Build List of Keywords from Text, Including # of Instances

  - by Jonathan Sampson

  I've already worked out this solution for myself with PHP, but I'm curious how it could be done differently - better even. The two languages I'm primarily interested in are PHP and Javascript, but I'd be interested in seeing how quickly this could be done in any other major language today as well (mostly C#, Java, etc). Return only words with an occurrence greater than X Return only words with a length greater than Y Ignore common terms like "and, is, the, etc" Feel free to strip punctuation prior to processing (ie. "John's" becomes "John") Return results in a collection/array Extra Credit Keep Quoted Statements together, (ie. "They were 'too good to be true' apparently")Where 'too good to be true' would be the actual statement Extra-Extra Credit Can your script determine words that should be kept together based upon their frequency of being found together? This being done without knowing the words beforehand. Example: "The fruit fly is a great thing when it comes to medical research. Much study has been done on the fruit fly in the past, and has lead to many breakthroughs. In the future, the fruit fly will continue to be studied, but our methods may change." Clearly the word here is "fruit fly," which is easy for us to find. Can your search'n'scrape script determine this too? Source text: http://sampsonresume.com/labs/c.txt Answer Format It would be great to see the results of your code, output, in addition to how long the operation lasted.

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• Simple Select Statement on MySQL Database Hanging

  - by AlishahNovin

  I have a very simple sql select statement on a very large table, that is non-normalized. (Not my design at all, I'm just trying to optimize while simultaneously trying to convince the owners of a redesign) Basically, the statement is like this: SELECT FirstName, LastName, FullName, State FROM Activity Where (FirstName=@name OR LastName=@name OR FullName=@name) AND State=@state; Now, FirstName, LastName, FullName and State are all indexed as BTrees, but without prefix - the whole column is indexed. State column is a 2 letter state code. What I'm finding is this: When @name = 'John Smith', and @state = '%' the search is really fast and yields results immediately. When @name = 'John Smith', and @state = 'FL' the search takes 5 minutes (and usually this means the web service times out...) When I remove the FirstName and LastName comparisons, and only use the FullName and State, both cases above work very quickly. When I replace FirstName, LastName, FullName, and State searches, but use LIKE for each search, it works fast for @name='John Smith%' and @state='%', but slow for @name='John Smith%' and @state='FL' When I search against 'John Sm%' and @state='FL' the search finds results immediately When I search against 'John Smi%' and @state='FL' the search takes 5 minutes. Now, just to reiterate - the table is not normalized. The John Smith appears many many times, as do many other users, because there is no reference to some form of users/people table. I'm not sure how many times a single user may appear, but the table itself has 90 Million records. Again, not my design... What I'm wondering is - though there are many many problems with this design, what is causing this specific problem. My guess is that the index trees are just too large that it just takes a very long time traversing the them. (FirstName, LastName, FullName) Anyway, I appreciate anyone's help with this. Like I said, I'm working on convincing them of a redesign, but in the meantime, if I someone could help me figure out what the exact problem is, that'd be fantastic.

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• javascript class calling XMLHttpRequest internally, then handling onreadystatechange

  - by Radu M

  this thing almost works: function myClass(url) { this.source = url; this.rq = null; this.someOtherProperty = "hello"; // open connection to the ajax server this.start = function() { if (window.XMLHttpRequest) { this.rq = new XMLHttpRequest(); if (this.rq.overrideMimeType) this.rq.overrideMimeType("text/xml"); } else this.rq = new ActiveXObject("Microsoft.XMLHTTP"); try { this.rq.onreadystatechange = connectionEvent; this.rq.open("GET", this.source, true); this.rq.send(null); this.state = 1; } catch (err) { // some error handler here } } function connectionEvent() { alert("i'm here"); alert("this doesnt work: " + this.someOtherProperty); } } // myClass so it's nothing more than having the XMLHttpRequest object as a member of my class, instead of globally defined, and invoking it in the traditional way. however, inside my connectionEvent callback function, the meaning of "this" is lost, even though the function itself is scoped inside myClass. i also made sure that the object that i instantiate from myClass is kept alive long enough (declared global in the script). in all the examples of using javascript classes that i saw, "this" was still available inside the inner functions. for me, it is not, even if i take my function outside and make it a myClass.prototype.connectionEvent. what am i doing wrong? thank you.

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• How to get principal name from HTTPRequest in CXF JAX-RS webservice method called from android app.

  - by johnrock

  How can I get the principal name, session and ideally check if the principal is authenticated with the Spring Security context inside a CXF JAX-RS webservice method receiving a call from an Android client? This is the code I am currently working with. I have commented where and what I am trying to get. Android code to call webservice: httpclient.getCredentialsProvider().setCredentials( new AuthScope("192.168.1.101", 80), new UsernamePasswordCredentials("joesmith", "mypasswd")); HttpGet httpget = new HttpGet(WEBSERVICE_URL+"/makePayload"); httpget.setHeader("User-Agent", userAgent); httpget.setHeader("Content-Type", "application/xml"); HttpResponse response; try { response = httpclient.execute(httpget); HttpEntity entity = response.getEntity(); ... parse xml from response } CXF, Spring webservice code: @GET @Path("/getPayload") @Produces("application/XML") public Response makePayload(@Context Request request){ //Get user principal name //Get session? //Get Spring security context? Payload payload = new Payload(); payload.setUsersOnline(new Long(200)); return Response.ok().entity(payload).build(); }

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• How to parse kanji numeric characters using ICU?

  - by Aki

  I'm writing a function using ICU to parse an Unicode string which consists of kanji numeric character(s) and want to return the integer value of the string. "?" = 5 "???" = 31 "???????" = 5972 I'm setting the locale to Locale::getJapan() and using the NumberFormat::parse() to parse the character string. However, whenever I pass it any Kanji characters, the parse() method is returning U_INVALID_FORMAT_ERROR. Does anyone know if ICU supports Kanji character strings in the NumberFormat::parse() method? I was hoping that since I'm setting the Locale to Japanese that it would be able to parse Kanji numeric values. Thanks! #include <iostream> #include <unicode/numfmt.h> using namespace std; int main(int argc, char **argv) { const Locale &jaLocale = Locale::getJapan(); UErrorCode status = U_ZERO_ERROR; NumberFormat *nf = NumberFormat::createInstance(jaLocale, status); UChar number[] = {0x4E94}; // Character for '5' in Japanese '?' UnicodeString numStr(number); Formattable formattable; nf->parse(numStr, formattable, status); if (U_FAILURE(status)) { cout << "error parsing as number: " << u_errorName(status) << endl; return(1); } cout << "long value: " << formattable.getLong() << endl; }

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• Can't build pyxpcom on OS X 10.6

  - by Gj

  I've been following these instructions at https://developer.mozilla.org/en/Building_PyXPCOM but getting this: $ make make export make[2]: Nothing to be done for `export'. make[4]: Nothing to be done for `export'. make[4]: Nothing to be done for `export'. /opt/local/bin/python2.5 ../../../src/config/nsinstall.py -L /usr/local/pyxpcom/build/xpcom/src -m 644 ../../../src/xpcom/src/PyXPCOM.h ../../dist/include make[3]: Nothing to be done for `export'. /opt/local/bin/python2.5 ../../../../src/config/nsinstall.py -D ../../../dist/idl /opt/local/bin/python2.5 ../../../../src/config/nsinstall.py -D ../../../dist/idl make[4]: *** No rule to make target `_xpidlgen/py_test_component.h', needed by `export'. Stop. make[3]: *** [export] Error 2 make[2]: *** [export] Error 2 make[1]: *** [export] Error 2 make: *** [default] Error 2 Any ideas? An interesting anomaly is that despite me setting the PYTHON env variable to Python 2.6, the configure and make both seem to go after the 2.5... Thanks for any advice! PS here's the configure output: $ ../src/configure --with-libxul-sdk=/Users/me/xulrunner-sdk/ loading cache ./config.cache checking host system type... i386-apple-darwin10.3.0 checking target system type... i386-apple-darwin10.3.0 checking build system type... i386-apple-darwin10.3.0 checking for mawk... (cached) gawk checking for perl5... (cached) /opt/local/bin/perl5 checking for gcc... (cached) gcc checking whether the C compiler (gcc ) works... yes checking whether the C compiler (gcc ) is a cross-compiler... no checking whether we are using GNU C... (cached) yes checking whether gcc accepts -g... (cached) yes checking for c++... (cached) c++ checking whether the C++ compiler (c++ ) works... yes checking whether the C++ compiler (c++ ) is a cross-compiler... no checking whether we are using GNU C++... (cached) yes checking whether c++ accepts -g... (cached) yes checking for ranlib... (cached) ranlib checking for as... (cached) /usr/bin/as checking for ar... (cached) ar checking for ld... (cached) ld checking for strip... (cached) strip checking for windres... no checking whether gcc and cc understand -c and -o together... (cached) yes checking how to run the C preprocessor... (cached) gcc -E checking how to run the C++ preprocessor... (cached) c++ -E checking for a BSD compatible install... (cached) /usr/bin/install -c checking whether ln -s works... (cached) yes checking for minimum required perl version >= 5.006... 5.008009 checking for full perl installation... yes checking for /opt/local/bin/python... (cached) /opt/local/bin/python2.5 checking for doxygen... (cached) : checking for whoami... (cached) /usr/bin/whoami checking for autoconf... (cached) /opt/local/bin/autoconf checking for unzip... (cached) /usr/bin/unzip checking for zip... (cached) /usr/bin/zip checking for makedepend... (cached) /opt/local/bin/makedepend checking for xargs... (cached) /usr/bin/xargs checking for pbbuild... (cached) /usr/bin/xcodebuild checking for sdp... (cached) /usr/bin/sdp checking for gmake... (cached) /opt/local/bin/gmake checking for X... (cached) no checking whether the compiler supports -Wno-invalid-offsetof... yes checking whether ld has archive extraction flags... (cached) no checking that static assertion macros used in autoconf tests work... (cached) yes checking for 64-bit OS... yes checking for minimum required Python version >= 2.4... yes checking for -dead_strip option to ld... yes checking for ANSI C header files... (cached) yes checking for working const... (cached) yes checking for mode_t... (cached) yes checking for off_t... (cached) yes checking for pid_t... (cached) yes checking for size_t... (cached) yes checking for st_blksize in struct stat... (cached) yes checking for siginfo_t... (cached) yes checking for int16_t... (cached) yes checking for int32_t... (cached) yes checking for int64_t... (cached) yes checking for int64... (cached) no checking for uint... (cached) yes checking for uint_t... (cached) no checking for uint16_t... (cached) no checking for uname.domainname... (cached) no checking for uname.__domainname... (cached) no checking for usable char16_t (2 bytes, unsigned)... (cached) no checking for usable wchar_t (2 bytes, unsigned)... (cached) no checking for compiler -fshort-wchar option... (cached) yes checking for visibility(hidden) attribute... (cached) yes checking for visibility(default) attribute... (cached) yes checking for visibility pragma support... (cached) yes checking For gcc visibility bug with class-level attributes (GCC bug 26905)... (cached) yes checking For x86_64 gcc visibility bug with builtins (GCC bug 20297)... (cached) no checking for dirent.h that defines DIR... (cached) yes checking for opendir in -ldir... (cached) no checking for sys/byteorder.h... (cached) no checking for compat.h... (cached) no checking for getopt.h... (cached) yes checking for sys/bitypes.h... (cached) no checking for memory.h... (cached) yes checking for unistd.h... (cached) yes checking for gnu/libc-version.h... (cached) no checking for nl_types.h... (cached) yes checking for malloc.h... (cached) no checking for X11/XKBlib.h... (cached) yes checking for io.h... (cached) no checking for sys/statvfs.h... (cached) yes checking for sys/statfs.h... (cached) no checking for sys/vfs.h... (cached) no checking for sys/mount.h... (cached) yes checking for sys/quota.h... (cached) yes checking for mmintrin.h... (cached) yes checking for new... (cached) yes checking for sys/cdefs.h... (cached) yes checking for gethostbyname_r in -lc_r... (cached) no checking for dladdr... (cached) yes checking for socket in -lsocket... (cached) no checking whether mmap() sees write()s... yes checking whether gcc needs -traditional... (cached) no checking for 8-bit clean memcmp... (cached) yes checking for random... (cached) yes checking for strerror... (cached) yes checking for lchown... (cached) yes checking for fchmod... (cached) yes checking for snprintf... (cached) yes checking for statvfs... (cached) yes checking for memmove... (cached) yes checking for rint... (cached) yes checking for stat64... (cached) yes checking for lstat64... (cached) yes checking for truncate64... (cached) no checking for statvfs64... (cached) no checking for setbuf... (cached) yes checking for isatty... (cached) yes checking for flockfile... (cached) yes checking for getpagesize... (cached) yes checking for localtime_r... (cached) yes checking for strtok_r... (cached) yes checking for wcrtomb... (cached) yes checking for mbrtowc... (cached) yes checking for res_ninit()... (cached) no checking for gnu_get_libc_version()... (cached) no ../src/configure: line 9881: AM_LANGINFO_CODESET: command not found checking for an implementation of va_copy()... (cached) yes checking for an implementation of __va_copy()... (cached) yes checking whether va_lists can be copied by value... (cached) no checking for C++ exceptions flag... (cached) -fno-exceptions checking for gcc 3.0 ABI... (cached) yes checking for C++ "explicit" keyword... (cached) yes checking for C++ "typename" keyword... (cached) yes checking for modern C++ template specialization syntax support... (cached) yes checking whether partial template specialization works... (cached) yes checking whether operators must be re-defined for templates derived from templates... (cached) no checking whether we need to cast a derived template to pass as its base class... (cached) no checking whether the compiler can resolve const ambiguities for templates... (cached) yes checking whether the C++ "using" keyword can change access... (cached) yes checking whether the C++ "using" keyword resolves ambiguity... (cached) yes checking for "std::" namespace... (cached) yes checking whether standard template operator!=() is ambiguous... (cached) unambiguous checking for C++ reinterpret_cast... (cached) yes checking for C++ dynamic_cast to void*... (cached) yes checking whether C++ requires implementation of unused virtual methods... (cached) yes checking for trouble comparing to zero near std::operator!=()... (cached) no checking for LC_MESSAGES... (cached) yes checking for tar archiver... checking for gnutar... (cached) gnutar gnutar checking for wget... checking for wget... (cached) wget wget checking for valid optimization flags... yes checking for gcc -pipe support... yes checking whether compiler supports -Wno-long-long... yes checking whether C compiler supports -fprofile-generate... yes checking for correct temporary object destruction order... yes checking for correct overload resolution with const and templates... no Building Python extensions using python-2.5 from /opt/local/Library/Frameworks/Python.framework/Versions/2.5 creating ./config.status creating config/autoconf.mk creating Makefile creating xpcom/Makefile creating xpcom/src/Makefile creating xpcom/src/loader/Makefile creating xpcom/src/module/Makefile creating xpcom/components/Makefile creating xpcom/test/Makefile creating xpcom/test/test_component/Makefile creating dom/Makefile creating dom/src/Makefile creating dom/test/Makefile creating dom/test/pyxultest/Makefile creating dom/nsdom/Makefile creating dom/nsdom/test/Makefile

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• How to reliably send a request cross domain and cross browser on page unload

  - by Agmin

  I have javascript code that's loaded by 3rd parties. The javascript keeps track of a number of metrics, and when a user exits the page I'd like to send the metrics back to my server. Due to XSS checks in some browsers, like IE, I cannot do a simple jquery.ajax() call. Instead, I'm appending an image src to the page with jquery. Here's the code, cased by browser: function record_metrics() { //Arbitrary code execution here to set test_url $esajquery('#MainDiv').append("<img src='" + test_url + "' />"); } if ($esajquery.browser.msie) { window.onbeforeunload = function() { record_metrics(); } } else { $esajquery(window).unload( function(){ record_metrics(); } ); } FF aborts the request to "test_url" if I use window.onbeforeunload, and IE8 doesn't work with jquery's unload(). IE8 also fails to work if the arbitrary test_url setting code is too long, although IE8 seems to work fine if the is immediately appended to the DOM. Is there a better way to solve this issue? Unfortunately this really needs to execute when a user leaves the page.

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• Experience migrating legacy Cobol/PL1 to Java

  - by MadMurf

  ORIGINAL Q: I'm wondering if anyone has had experience of migrating a large Cobol/PL1 codebase to Java? How automated was the process and how maintainable was the output? How did the move from transactional to OO work out? Any lessons learned along the way or resources/white papers that may be of benefit would be appreciated. EDIT 7/7: Certainly the NACA approach is interesting, the ability to continue making your BAU changes to the COBOL code right up to the point of releasing the JAVA version has merit for any organization. The argument for procedural Java in the same layout as the COBOL to give the coders a sense of comfort while familiarizing with the Java language is a valid argument for a large organisation with a large code base. As @Didier points out the $3mil annual saving gives scope for generous padding on any BAU changes going forward to refactor the code on an ongoing basis. As he puts it if you care about your people you find a way to keep them happy while gradually challenging them. The problem as I see it with the suggestion from @duffymo to Best to try and really understand the problem at its roots and re-express it as an object-oriented system is that if you have any BAU changes ongoing then during the LONG project lifetime of coding your new OO system you end up coding & testing changes on the double. That is a major benefit of the NACA approach. I've had some experience of migrating Client-Server applications to a web implementation and this was one of the major issues we encountered, constantly shifting requirements due to BAU changes. It made PM & scheduling a real challenge. Thanks to @hhafez who's experience is nicely put as "similar but slightly different" and has had a reasonably satisfactory experience of an automatic code migration from Ada to Java. Thanks @Didier for contributing, I'm still studying your approach and if I have any Q's I'll drop you a line.

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• Machine Learning Algorithm for Predicting Order of Events?

  - by user213060

  Simple machine learning question. Probably numerous ways to solve this: There is an infinite stream of 4 possible events: 'event_1', 'event_2', 'event_4', 'event_4' The events do not come in in completely random order. We will assume that there are some complex patterns to the order that most events come in, and the rest of the events are just random. We do not know the patterns ahead of time though. After each event is received, I want to predict what the next event will be based on the order that events have come in in the past. The predictor will then be told what the next event actually was: Predictor=new_predictor() prev_event=False while True: event=get_event() if prev_event is not False: Predictor.last_event_was(prev_event) predicted_event=Predictor.predict_next_event(event) The question arises of how long of a history that the predictor should maintain, since maintaining infinite history will not be possible. I'll leave this up to you to answer. The answer can't be infinte though for practicality. So I believe that the predictions will have to be done with some kind of rolling history. Adding a new event and expiring an old event should therefore be rather efficient, and not require rebuilding the entire predictor model, for example. Specific code, instead of research papers, would add for me immense value to your responses. Python or C libraries are nice, but anything will do. Thanks! Update: And what if more than one event can happen simultaneously on each round. Does that change the solution?

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• Java List with Objects - find and replace (delete) entry if Object with certain attribute already ex

  - by Sophomore

  Hi there I've been working all day and I somehow can't get this probably easy task figured out - probably a lack of coffee... I have a synchronizedList where some Objects are being stored. Those objects have a field which is something like an ID. These objects carry information about a user and his current state (simplified). The point is, that I only want one object for each user. So when the state of this user changes, I'd like to remove the "old" entry and store a new one in the List. protected static class Objects{ ... long time; Object ID; ... } ... if (Objects.contains(ID)) { Objects.remove(ID); Objects.add(newObject); } else { Objects.add(newObject); } Obviously this is not the way to go but should illustrate what I'm looking for... Maybe the data structure is not the best for this purpose but any help is welcome!

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• Optimizing code using PIL

  - by freakazo

  Firstly sorry for the long piece of code pasted below. This is my first time actually having to worry about performance of an application so I haven't really ever worried about performance. This piece of code pretty much searches for an image inside another image, it takes 30 seconds to run on my computer, converting the images to greyscale and other changes shaved of 15 seconds, I need another 15 shaved off. I did read a bunch of pages and looked at examples but I couldn't find the same problems in my code. So any help would be greatly appreciated. From the looks of it (cProfile) 25 seconds is spent within the Image module, and only 5 seconds in my code. from PIL import Image import os, ImageGrab, pdb, time, win32api, win32con import cProfile def GetImage(name): name = name + '.bmp' try: print(os.path.join(os.getcwd(),"Images",name)) image = Image.open(os.path.join(os.getcwd(),"Images",name)) except: print('error opening image;', name) return image def Find(name): image = GetImage(name) imagebbox = image.getbbox() screen = ImageGrab.grab() #screen = Image.open(os.path.join(os.getcwd(),"Images","Untitled.bmp")) YLimit = screen.getbbox()[3] - imagebbox[3] XLimit = screen.getbbox()[2] - imagebbox[2] image = image.convert("L") Screen = screen.convert("L") Screen.load() image.load() #print(XLimit, YLimit) Found = False image = image.getdata() for y in range(0,YLimit): for x in range(0,XLimit): BoxCoordinates = x, y, x+imagebbox[2], y+imagebbox[3] ScreenGrab = screen.crop(BoxCoordinates) ScreenGrab = ScreenGrab.getdata() if image == ScreenGrab: Found = True #print("woop") return x,y if Found == False: return "Not Found" cProfile.run('print(Find("Login"))')

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• Problem using Hibernate Projections

  - by Lucas

  Hello! I'm using Richfaces + HibernateQuery to create a data list. I'm trying to use Hibernate Projections to group my query result. Here is the code: final DetachedCriteria criteria = DetachedCriteria .forClass(Class.class, "c") .setProjection(Projections.projectionList() .add(Projections.groupProperty("c.id"))); ... in the .xhtml file i have the following code: <rich:dataTable width="100%" id="dataTable" value="#{myBean.dataModel}" var="row"> <f:facet name="header"> <rich:columnGroup> ...... </rich:columnGroup> </f:facet> <h:column> <h:outputText value="#{row.id}"/> </h:column> <h:column> <h:outputText value="#{row.name}"/> </h:column> But when i run the page it gives me the following error: Error: value="#{row.id}": The class 'java.lang.Long' does not have the property 'id'. If i take out the Projection from the code it works correctly, but it doesn't group the result. So, which mistake could be happening here? EDIT: Here is the full criteria: final DetachedCriteria criteria = DetachedCriteria.forClass(Class.class, "c"); criteria.setFetchMode("e.zzzzz", FetchMode.JOIN); criteria.createAlias("e.aaaaaaaa", "aa"); criteria.add(Restrictions.ilike("aa.information", "informations....")); criteria.setProjection(Projections.distinct(Projections.projectionList() .add(Projections.groupProperty("e.id").as("e.id")))); getDao().findByCriteria(criteria); if i take the "setProjection" line it works fine. I don't understand why it gives that error putting that line.

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• Why does perl crash with "*** glibc detected *** perl: munmap_chunk(): invalid pointer"?

  - by sid_com

  #!/usr/bin/env perl use warnings; use strict; use 5.012; use XML::LibXML::Reader; my $reader = XML::LibXML::Reader->new( location => 'http://www.heise.de/' ) or die $!; while ( $reader->read ) { say $reader->name; } At the end of the output from this script I get this error-messages: * glibc detected * perl: munmap_chunk(): invalid pointer: 0x0000000000b362e0 * ======= Backtrace: ========= /lib64/libc.so.6[0x7fb84952fc76] ... ======= Memory map: ======== 00400000-0053d000 r-xp 00000000 08:01 182002 /usr/local/bin/perl ... Is this due a bug? perl -V: Summary of my perl5 (revision 5 version 12 subversion 0) configuration: Platform: osname=linux, osvers=2.6.31.12-0.2-desktop, archname=x86_64-linux uname='linux linux1 2.6.31.12-0.2-desktop #1 smp preempt 2010-03-16 21:25:39 +0100 x86_64 x86_64 x86_64 gnulinux ' config_args='-Dnoextensions=ODBM_File' hint=recommended, useposix=true, d_sigaction=define useithreads=undef, usemultiplicity=undef useperlio=define, d_sfio=undef, uselargefiles=define, usesocks=undef use64bitint=define, use64bitall=define, uselongdouble=undef usemymalloc=n, bincompat5005=undef Compiler: cc='cc', ccflags ='-fno-strict-aliasing -pipe -fstack-protector -I/usr/local/include -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64', optimize='-O2', cppflags='-fno-strict-aliasing -pipe -fstack-protector -I/usr/local/include' ccversion='', gccversion='4.4.1 [gcc-4_4-branch revision 150839]', gccosandvers='' intsize=4, longsize=8, ptrsize=8, doublesize=8, byteorder=12345678 d_longlong=define, longlongsize=8, d_longdbl=define, longdblsize=16 ivtype='long', ivsize=8, nvtype='double', nvsize=8, Off_t='off_t', lseeksize=8 alignbytes=8, prototype=define Linker and Libraries: ld='cc', ldflags =' -fstack-protector -L/usr/local/lib' libpth=/usr/local/lib /lib /usr/lib /lib64 /usr/lib64 /usr/local/lib64 libs=-lnsl -ldl -lm -lcrypt -lutil -lc perllibs=-lnsl -ldl -lm -lcrypt -lutil -lc libc=/lib/libc-2.10.1.so, so=so, useshrplib=false, libperl=libperl.a gnulibc_version='2.10.1' Dynamic Linking: dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags='-Wl,-E' cccdlflags='-fPIC', lddlflags='-shared -O2 -L/usr/local/lib -fstack-protector' Characteristics of this binary (from libperl): Compile-time options: PERL_DONT_CREATE_GVSV PERL_MALLOC_WRAP USE_64_BIT_ALL USE_64_BIT_INT USE_LARGE_FILES USE_PERLIO USE_PERL_ATOF Built under linux Compiled at Apr 15 2010 13:25:46 @INC: /usr/local/lib/perl5/site_perl/5.12.0/x86_64-linux /usr/local/lib/perl5/site_perl/5.12.0 /usr/local/lib/perl5/5.12.0/x86_64-linux /usr/local/lib/perl5/5.12.0 .

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• How do I pass an array of structs (containing std:string or BSTR) from ATL to C#. SafeArray? Varian

  - by Andrew

  Hi, I have an ATL COM object that I am using from C#. The interface currently looks like: interface ICHASCom : IDispatch{ [id(1), helpstring("method Start")] HRESULT Start([in] BSTR name, [out,retval] VARIANT_BOOL* result); ... [id(4), helpstring("method GetCount")] HRESULT GetCount([out,retval] LONG* numPorts); ... [id(7), helpstring("method EnableLogging")] HRESULT EnableLogging([in] VARIANT_BOOL enableLogging); }; That is, it's a very simple interface. I also have some events that I send back too. Now, I would like to add something to the interface. In the ATL I have some results, which are currently structs and look like struct REPORT_LINE { string creationDate; string Id; string summary; }; All the members of the struct are std::string. I have an array of these that I need to get back to the C#. What's the best way to do this? I suspect someone is going to say, "hey, you can't just send std::string over COM like that. If so, fine, but what's the best way to modidfy the struct? Change the std::string to BSTR? And then how do I, 1) Set up the IDL to pass an array of structs (structs with BSTR or std::string) 2) If I must use SAFEARRAYS, how do I fill the SAFEARRAYS with the structs. I'm not familiar with COM except for use with simple types. Thanks, Dave

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